Gurty -> usable state

protocol/cli/Cargo.lock

@@ -91,6 +91,17 @@ dependencies = [
  "windows-sys 0.60.2",
 ]
 
+[[package]]
+name = "async-trait"
+version = "0.1.89"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9035ad2d096bed7955a320ee7e2230574d28fd3c3a0f186cbea1ff3c7eed5dbb"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.5.0"
@@ -338,6 +349,12 @@ version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "48c757948c5ede0e46177b7add2e67155f70e33c07fea8284df6576da70b3719"
 
+[[package]]
+name = "equivalent"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
+
 [[package]]
 name = "errno"
 version = "0.3.13"
@@ -420,17 +437,27 @@ dependencies = [
 name = "gurty"
 version = "0.1.0"
 dependencies = [
+ "async-trait",
  "clap",
  "colored",
  "gurt",
+ "indexmap",
  "mime_guess",
+ "regex",
  "serde",
  "serde_json",
  "tokio",
+ "toml",
  "tracing",
  "tracing-subscriber",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.15.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9229cfe53dfd69f0609a49f65461bd93001ea1ef889cd5529dd176593f5338a1"
+
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -577,6 +604,16 @@ dependencies = [
  "icu_properties",
 ]
 
+[[package]]
+name = "indexmap"
+version = "2.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe4cd85333e22411419a0bcae1297d25e58c9443848b11dc6a86fefe8c78a661"
+dependencies = [
+ "equivalent",
+ "hashbrown",
+]
+
 [[package]]
 name = "io-uring"
 version = "0.7.9"
@@ -1089,6 +1126,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_spanned"
+version = "0.6.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf41e0cfaf7226dca15e8197172c295a782857fcb97fad1808a166870dee75a3"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "sharded-slab"
 version = "0.1.7"
@@ -1255,6 +1301,47 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "toml"
+version = "0.8.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc1beb996b9d83529a9e75c17a1686767d148d70663143c7854d8b4a09ced362"
+dependencies = [
+ "serde",
+ "serde_spanned",
+ "toml_datetime",
+ "toml_edit",
+]
+
+[[package]]
+name = "toml_datetime"
+version = "0.6.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22cddaf88f4fbc13c51aebbf5f8eceb5c7c5a9da2ac40a13519eb5b0a0e8f11c"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "toml_edit"
+version = "0.22.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41fe8c660ae4257887cf66394862d21dbca4a6ddd26f04a3560410406a2f819a"
+dependencies = [
+ "indexmap",
+ "serde",
+ "serde_spanned",
+ "toml_datetime",
+ "toml_write",
+ "winnow",
+]
+
+[[package]]
+name = "toml_write"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d99f8c9a7727884afe522e9bd5edbfc91a3312b36a77b5fb8926e4c31a41801"
+
 [[package]]
 name = "tracing"
 version = "0.1.41"
@@ -1681,6 +1768,15 @@ version = "0.53.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "271414315aff87387382ec3d271b52d7ae78726f5d44ac98b4f4030c91880486"
 
+[[package]]
+name = "winnow"
+version = "0.7.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3edebf492c8125044983378ecb5766203ad3b4c2f7a922bd7dd207f6d443e95"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "wit-bindgen-rt"
 version = "0.39.0"

protocol/cli/Cargo.toml

@@ -22,4 +22,8 @@ tracing-subscriber = "0.3"
 
 clap = { version = "4.0", features = ["derive"] }
 colored = "2.0"
-mime_guess = "2.0"
+mime_guess = "2.0"
+async-trait = "0.1"
+toml = "0.8"
+regex = "1.0"
+indexmap = "2.0"

protocol/cli/gurty.toml

@@ -0,0 +1,60 @@
+[server]
+host = "127.0.0.1"
+port = 4878
+protocol_version = "1.0.0"
+alpn_identifier = "GURT/1.0"
+max_connections = 10
+max_message_size = "10MB"
+
+[server.timeouts]
+handshake = 5
+request = 30
+connection = 10
+pool_idle = 300
+
+[tls]
+certificate = "/path/to/certificate.pem"
+private_key = "/path/to/private_key.pem"
+
+[logging]
+level = "info"
+# access_log = "/var/log/gurty/access.log"
+# error_log = "/var/log/gurty/error.log"
+log_requests = true
+log_responses = false
+
+[security]
+deny_files = [
+    "*.env",
+    "*.config", 
+    ".git/*",
+    "node_modules/*",
+    "*.key",
+    "*.pem"
+]
+
+allowed_methods = ["GET", "POST", "PUT", "DELETE", "HEAD", "OPTIONS", "PATCH"]
+rate_limit_requests = 100  # requests per minute
+rate_limit_connections = 1000  # concurrent connections per IP
+
+# Error pages configuration
+[error_pages]
+# Specific error pages (uncomment and set paths to custom files)
+# "400" = "/errors/400.html"
+# "401" = "/errors/401.html"
+# "403" = "/errors/403.html"
+# "404" = "/errors/404.html"
+# "405" = "/errors/405.html"
+# "429" = "/errors/429.html"
+# "500" = "/errors/500.html"
+# "503" = "/errors/503.html"
+
+[error_pages.default]
+"400" = '''<!DOCTYPE html>
+<html><head><title>400 Bad Request</title></head>
+<body><h1>400 - Bad Request</h1><p>The request could not be understood by the server.</p><a href="/">Back to home</a></body></html>'''
+
+[headers]
+server = "GURT/1.0.0"
+"x-frame-options" = "SAMEORIGIN"
+"x-content-type-options" = "nosniff"

protocol/cli/src/cli.rs

@@ -0,0 +1,88 @@
+use clap::{Parser, Subcommand};
+use std::path::PathBuf;
+
+#[derive(Parser)]
+#[command(name = "server")]
+#[command(about = "GURT Protocol Server")]
+#[command(version = "1.0.0")]
+pub struct Cli {
+    #[command(subcommand)]
+    pub command: Commands,
+}
+
+#[derive(Subcommand)]
+pub enum Commands {
+    Serve(ServeCommand),
+}
+
+#[derive(Parser)]
+pub struct ServeCommand {
+    #[arg(short, long, help = "Configuration file path")]
+    pub config: Option<PathBuf>,
+    
+    #[arg(short, long, default_value_t = 4878)]
+    pub port: u16,
+    
+    #[arg(long, default_value = "127.0.0.1")]
+    pub host: String,
+    
+    #[arg(short, long, default_value = ".")]
+    pub dir: PathBuf,
+    
+    #[arg(short, long)]
+    pub verbose: bool,
+    
+    #[arg(long, help = "Path to TLS certificate file")]
+    pub cert: Option<PathBuf>,
+    
+    #[arg(long, help = "Path to TLS private key file")]
+    pub key: Option<PathBuf>,
+}
+
+impl ServeCommand {
+    pub fn validate(&self) -> crate::Result<()> {
+        if !self.dir.exists() {
+            return Err(crate::ServerError::InvalidPath(
+                format!("Directory does not exist: {}", self.dir.display())
+            ));
+        }
+
+        if !self.dir.is_dir() {
+            return Err(crate::ServerError::InvalidPath(
+                format!("Path is not a directory: {}", self.dir.display())
+            ));
+        }
+
+        match (&self.cert, &self.key) {
+            (Some(cert), Some(key)) => {
+                if !cert.exists() {
+                    return Err(crate::ServerError::TlsConfiguration(
+                        format!("Certificate file does not exist: {}", cert.display())
+                    ));
+                }
+                if !key.exists() {
+                    return Err(crate::ServerError::TlsConfiguration(
+                        format!("Key file does not exist: {}", key.display())
+                    ));
+                }
+            }
+            (Some(_), None) => {
+                return Err(crate::ServerError::TlsConfiguration(
+                    "Certificate provided but no key file specified (use --key)".to_string()
+                ));
+            }
+            (None, Some(_)) => {
+                return Err(crate::ServerError::TlsConfiguration(
+                    "Key provided but no certificate file specified (use --cert)".to_string()
+                ));
+            }
+            (None, None) => {
+                return Err(crate::ServerError::TlsConfiguration(
+                    "GURT protocol requires TLS encryption. Please provide --cert and --key parameters.".to_string()
+                ));
+            }
+        }
+
+        Ok(())
+    }
+}

protocol/cli/src/command_handler.rs

@@ -0,0 +1,160 @@
+use crate::{
+    cli::ServeCommand,
+    config::GurtConfig,
+    server::FileServerBuilder,
+    Result,
+};
+use async_trait::async_trait;
+use colored::Colorize;
+use tracing::{error, info};
+
+#[async_trait]
+pub trait CommandHandler {
+    async fn execute(&self) -> Result<()>;
+}
+
+pub struct CommandHandlerBuilder {
+    logging_initialized: bool,
+    verbose: bool,
+}
+
+impl CommandHandlerBuilder {
+    pub fn new() -> Self {
+        Self {
+            logging_initialized: false,
+            verbose: false,
+        }
+    }
+
+    pub fn with_logging(mut self, verbose: bool) -> Self {
+        self.verbose = verbose;
+        self
+    }
+
+    pub fn initialize_logging(mut self) -> Self {
+        if !self.logging_initialized {
+            let level = if self.verbose {
+                tracing::Level::DEBUG
+            } else {
+                tracing::Level::INFO
+            };
+            
+            tracing_subscriber::fmt()
+                .with_max_level(level)
+                .init();
+            
+            self.logging_initialized = true;
+        }
+        self
+    }
+
+    pub fn build_serve_handler(self, serve_cmd: ServeCommand) -> ServeCommandHandler {
+        ServeCommandHandler::new(serve_cmd)
+    }
+}
+
+impl Default for CommandHandlerBuilder {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+pub struct ServeCommandHandler {
+    serve_cmd: ServeCommand,
+}
+
+impl ServeCommandHandler {
+    pub fn new(serve_cmd: ServeCommand) -> Self {
+        Self { serve_cmd }
+    }
+
+    fn validate_command(&self) -> Result<()> {
+        if !self.serve_cmd.dir.exists() {
+            return Err(crate::ServerError::InvalidPath(
+                format!("Directory does not exist: {}", self.serve_cmd.dir.display())
+            ));
+        }
+
+        if !self.serve_cmd.dir.is_dir() {
+            return Err(crate::ServerError::InvalidPath(
+                format!("Path is not a directory: {}", self.serve_cmd.dir.display())
+            ));
+        }
+
+        Ok(())
+    }
+
+    fn build_server_config(&self) -> Result<GurtConfig> {
+        let mut config_builder = GurtConfig::builder();
+
+        if let Some(config_file) = &self.serve_cmd.config {
+            config_builder = config_builder.from_file(config_file)?;
+        }
+
+        let config = config_builder
+            .merge_cli_args(&self.serve_cmd)
+            .build()?;
+
+        Ok(config)
+    }
+
+    fn display_startup_info(&self, config: &GurtConfig) {
+        println!("{}", "GURT Protocol Server".bright_cyan().bold());
+        println!("{} {}", "Version".bright_blue(), config.server.protocol_version);
+        println!("{} {}", "Listening on".bright_blue(), config.address());
+        println!("{} {}", "Serving from".bright_blue(), config.server.base_directory.display());
+        
+        if config.tls.is_some() {
+            println!("{}", "TLS encryption enabled".bright_green());
+        }
+
+        if let Some(logging) = &config.logging {
+            println!("{} {}", "Log level".bright_blue(), logging.level);
+            if logging.log_requests {
+                println!("{}", "Request logging enabled".bright_green());
+            }
+        }
+
+        if let Some(security) = &config.security {
+            println!("{} {} req/min", "Rate limit".bright_blue(), security.rate_limit_requests);
+            if !security.deny_files.is_empty() {
+                println!("{} {} patterns", "File restrictions".bright_blue(), security.deny_files.len());
+            }
+        }
+
+        if let Some(headers) = &config.headers {
+            if !headers.is_empty() {
+                println!("{} {} headers", "Custom headers".bright_blue(), headers.len());
+            }
+        }
+
+        println!("{} {}", "Max connections".bright_blue(), config.server.max_connections);
+        println!("{} {}", "Max message size".bright_blue(), config.server.max_message_size);
+        println!();
+    }
+
+    async fn start_server(&self, config: &GurtConfig) -> Result<()> {
+        let server = FileServerBuilder::new(config.clone()).build()?;
+        
+        info!("Starting GURT server on {}", config.address());
+        
+        if let Err(e) = server.listen(&config.address()).await {
+            error!("Server error: {}", e);
+            std::process::exit(1);
+        }
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl CommandHandler for ServeCommandHandler {
+    async fn execute(&self) -> Result<()> {
+        self.validate_command()?;
+        
+        let config = self.build_server_config()?;
+        
+        self.display_startup_info(&config);
+        self.start_server(&config).await
+    }
+}

protocol/cli/src/config.rs

@@ -0,0 +1,607 @@
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use std::path::PathBuf;
+use std::sync::Arc;
+use std::time::Duration;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct GurtConfig {
+    pub server: ServerConfig,
+    pub tls: Option<TlsConfig>,
+    pub logging: Option<LoggingConfig>,
+    pub security: Option<SecurityConfig>,
+    pub error_pages: Option<ErrorPagesConfig>,
+    pub headers: Option<HashMap<String, String>>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ServerConfig {
+    #[serde(default = "default_host")]
+    pub host: String,
+    
+    #[serde(default = "default_port")]
+    pub port: u16,
+    
+    #[serde(default = "default_protocol_version")]
+    pub protocol_version: String,
+    
+    #[serde(default = "default_alpn_identifier")]
+    pub alpn_identifier: String,
+    
+    pub timeouts: Option<TimeoutsConfig>,
+    
+    #[serde(default = "default_max_connections")]
+    pub max_connections: u32,
+    
+    #[serde(default = "default_max_message_size")]
+    pub max_message_size: String,
+    
+    #[serde(skip)]
+    pub base_directory: Arc<PathBuf>,
+    
+    #[serde(skip)]
+    pub verbose: bool,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct TimeoutsConfig {
+    #[serde(default = "default_handshake_timeout")]
+    pub handshake: u64,
+    
+    #[serde(default = "default_request_timeout")]
+    pub request: u64,
+    
+    #[serde(default = "default_connection_timeout")]
+    pub connection: u64,
+    
+    #[serde(default = "default_pool_idle_timeout")]
+    pub pool_idle: u64,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct TlsConfig {
+    pub certificate: PathBuf,
+    pub private_key: PathBuf,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct LoggingConfig {
+    #[serde(default = "default_log_level")]
+    pub level: String,
+    
+    pub access_log: Option<PathBuf>,
+    pub error_log: Option<PathBuf>,
+    
+    #[serde(default = "default_log_requests")]
+    pub log_requests: bool,
+    
+    #[serde(default)]
+    pub log_responses: bool,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SecurityConfig {
+    #[serde(default)]
+    pub deny_files: Vec<String>,
+    
+    #[serde(default = "default_allowed_methods")]
+    pub allowed_methods: Vec<String>,
+    
+    #[serde(default = "default_rate_limit_requests")]
+    pub rate_limit_requests: u32,
+    
+    #[serde(default = "default_rate_limit_connections")]
+    pub rate_limit_connections: u32,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ErrorPagesConfig {
+    #[serde(flatten)]
+    pub pages: HashMap<String, String>,
+    
+    pub default: Option<ErrorPageDefaults>,
+}
+
+impl ErrorPagesConfig {
+    pub fn get_page(&self, status_code: u16) -> Option<&String> {
+        let code_str = status_code.to_string();
+        self.pages.get(&code_str)
+    }
+    
+    pub fn get_default_page(&self, status_code: u16) -> Option<&String> {
+        if let Some(defaults) = &self.default {
+            let code_str = status_code.to_string();
+            defaults.pages.get(&code_str)
+        } else {
+            None
+        }
+    }
+    
+    pub fn get_any_page(&self, status_code: u16) -> Option<&String> {
+        self.get_page(status_code)
+            .or_else(|| self.get_default_page(status_code))
+    }
+
+    pub fn get_page_content(&self, status_code: u16, base_dir: &std::path::Path) -> Option<String> {
+        if let Some(page_value) = self.get_page(status_code) {
+            if page_value.starts_with('/') || page_value.starts_with("./") {
+                let file_path = if page_value.starts_with('/') {
+                    base_dir.join(&page_value[1..])
+                } else {
+                    base_dir.join(page_value)
+                };
+                
+                if let Ok(content) = std::fs::read_to_string(&file_path) {
+                    return Some(content);
+                } else {
+                    tracing::warn!("Failed to read error page file: {}", file_path.display());
+                    return None;
+                }
+            } else {
+                return Some(page_value.clone());
+            }
+        }
+        
+        if let Some(page_value) = self.get_default_page(status_code) {
+            return Some(page_value.clone());
+        }
+        
+        None
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ErrorPageDefaults {
+    #[serde(flatten)]
+    pub pages: HashMap<String, String>,
+}
+
+fn default_host() -> String { "127.0.0.1".to_string() }
+fn default_port() -> u16 { 4878 }
+fn default_protocol_version() -> String { "1.0.0".to_string() }
+fn default_alpn_identifier() -> String { "GURT/1.0".to_string() }
+fn default_max_connections() -> u32 { 10 }
+fn default_max_message_size() -> String { "10MB".to_string() }
+fn default_handshake_timeout() -> u64 { 5 }
+fn default_request_timeout() -> u64 { 30 }
+fn default_connection_timeout() -> u64 { 10 }
+fn default_pool_idle_timeout() -> u64 { 300 }
+fn default_log_level() -> String { "info".to_string() }
+fn default_log_requests() -> bool { true }
+fn default_allowed_methods() -> Vec<String> {
+    vec!["GET".to_string(), "POST".to_string(), "PUT".to_string(), 
+         "DELETE".to_string(), "HEAD".to_string(), "OPTIONS".to_string(), "PATCH".to_string()]
+}
+fn default_rate_limit_requests() -> u32 { 100 }
+fn default_rate_limit_connections() -> u32 { 10 }
+
+impl Default for GurtConfig {
+    fn default() -> Self {
+        Self {
+            server: ServerConfig::default(),
+            tls: None,
+            logging: None,
+            security: None,
+            error_pages: None,
+            headers: None,
+        }
+    }
+}
+
+impl Default for ServerConfig {
+    fn default() -> Self {
+        Self {
+            host: default_host(),
+            port: default_port(),
+            protocol_version: default_protocol_version(),
+            alpn_identifier: default_alpn_identifier(),
+            timeouts: None,
+            max_connections: default_max_connections(),
+            max_message_size: default_max_message_size(),
+            base_directory: Arc::new(PathBuf::from(".")),
+            verbose: false,
+        }
+    }
+}
+
+impl GurtConfig {
+    pub fn from_file<P: AsRef<std::path::Path>>(path: P) -> crate::Result<Self> {
+        let content = std::fs::read_to_string(path)
+            .map_err(|e| crate::ServerError::InvalidConfiguration(format!("Failed to read config file: {}", e)))?;
+        
+        let config: GurtConfig = toml::from_str(&content)
+            .map_err(|e| crate::ServerError::InvalidConfiguration(format!("Failed to parse config file: {}", e)))?;
+        
+        Ok(config)
+    }
+
+    pub fn builder() -> GurtConfigBuilder {
+        GurtConfigBuilder::default()
+    }
+
+    pub fn address(&self) -> String {
+        format!("{}:{}", self.server.host, self.server.port)
+    }
+
+    pub fn max_message_size_bytes(&self) -> crate::Result<u64> {
+        parse_size(&self.server.max_message_size)
+    }
+
+    pub fn get_handshake_timeout(&self) -> Duration {
+        Duration::from_secs(
+            self.server.timeouts
+                .as_ref()
+                .map(|t| t.handshake)
+                .unwrap_or(default_handshake_timeout())
+        )
+    }
+
+    pub fn get_request_timeout(&self) -> Duration {
+        Duration::from_secs(
+            self.server.timeouts
+                .as_ref()
+                .map(|t| t.request)
+                .unwrap_or(default_request_timeout())
+        )
+    }
+
+    pub fn get_connection_timeout(&self) -> Duration {
+        Duration::from_secs(
+            self.server.timeouts
+                .as_ref()
+                .map(|t| t.connection)
+                .unwrap_or(default_connection_timeout())
+        )
+    }
+
+    pub fn should_deny_file(&self, file_path: &str) -> bool {
+        if let Some(security) = &self.security {
+            for pattern in &security.deny_files {
+                if matches_pattern(file_path, pattern) {
+                    return true;
+                }
+            }
+        }
+        false
+    }
+
+    pub fn is_method_allowed(&self, method: &str) -> bool {
+        if let Some(security) = &self.security {
+            security.allowed_methods.contains(&method.to_uppercase())
+        } else {
+            default_allowed_methods().contains(&method.to_uppercase())
+        }
+    }
+
+    pub fn default_with_directory(base_dir: PathBuf) -> Self {
+        let mut config = Self::default();
+        config.server.base_directory = Arc::new(base_dir);
+        config
+    }
+
+    pub fn from_toml(toml_content: &str, base_dir: PathBuf) -> crate::Result<Self> {
+        let mut config: GurtConfig = toml::from_str(toml_content)
+            .map_err(|e| crate::ServerError::InvalidConfiguration(format!("Failed to parse config: {}", e)))?;
+        
+        config.server.base_directory = Arc::new(base_dir);
+        Ok(config)
+    }
+
+    pub fn validate(&self) -> crate::Result<()> {
+        if !self.server.base_directory.exists() || !self.server.base_directory.is_dir() {
+            return Err(crate::ServerError::InvalidConfiguration(
+                format!("Invalid base directory: {}", self.server.base_directory.display())
+            ));
+        }
+
+        if let Some(tls) = &self.tls {
+            if !tls.certificate.exists() {
+                return Err(crate::ServerError::TlsConfiguration(
+                    format!("Certificate file does not exist: {}", tls.certificate.display())
+                ));
+            }
+            if !tls.private_key.exists() {
+                return Err(crate::ServerError::TlsConfiguration(
+                    format!("Private key file does not exist: {}", tls.private_key.display())
+                ));
+            }
+        }
+
+        Ok(())
+    }
+}
+
+#[derive(Default)]
+pub struct GurtConfigBuilder {
+    config: GurtConfig,
+}
+
+impl GurtConfigBuilder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn host<S: Into<String>>(mut self, host: S) -> Self {
+        self.config.server.host = host.into();
+        self
+    }
+
+    pub fn port(mut self, port: u16) -> Self {
+        self.config.server.port = port;
+        self
+    }
+
+    pub fn base_directory<P: Into<PathBuf>>(mut self, dir: P) -> Self {
+        self.config.server.base_directory = Arc::new(dir.into());
+        self
+    }
+
+    pub fn verbose(mut self, verbose: bool) -> Self {
+        self.config.server.verbose = verbose;
+        self
+    }
+
+    pub fn tls_config(mut self, cert_path: PathBuf, key_path: PathBuf) -> Self {
+        self.config.tls = Some(TlsConfig {
+            certificate: cert_path,
+            private_key: key_path,
+        });
+        self
+    }
+
+    pub fn logging_config(mut self, config: LoggingConfig) -> Self {
+        self.config.logging = Some(config);
+        self
+    }
+
+    pub fn security_config(mut self, config: SecurityConfig) -> Self {
+        self.config.security = Some(config);
+        self
+    }
+
+    pub fn error_pages_config(mut self, config: ErrorPagesConfig) -> Self {
+        self.config.error_pages = Some(config);
+        self
+    }
+
+    pub fn headers(mut self, headers: HashMap<String, String>) -> Self {
+        self.config.headers = Some(headers);
+        self
+    }
+
+    pub fn from_file<P: AsRef<std::path::Path>>(mut self, path: P) -> crate::Result<Self> {
+        let file_config = GurtConfig::from_file(path)?;
+        self.config = merge_configs(file_config, self.config);
+        Ok(self)
+    }
+
+    pub fn merge_cli_args(mut self, cli_args: &crate::cli::ServeCommand) -> Self {
+        self.config.server.host = cli_args.host.clone();
+        self.config.server.port = cli_args.port;
+        self.config.server.base_directory = Arc::new(cli_args.dir.clone());
+        self.config.server.verbose = cli_args.verbose;
+
+        if let (Some(cert), Some(key)) = (&cli_args.cert, &cli_args.key) {
+            self.config.tls = Some(TlsConfig {
+                certificate: cert.clone(),
+                private_key: key.clone(),
+            });
+        }
+
+        self
+    }
+
+    pub fn build(self) -> crate::Result<GurtConfig> {
+        let config = self.config;
+
+        if !config.server.base_directory.exists() || !config.server.base_directory.is_dir() {
+            return Err(crate::ServerError::InvalidConfiguration(
+                format!("Invalid base directory: {}", config.server.base_directory.display())
+            ));
+        }
+
+        if let Some(tls) = &config.tls {
+            if !tls.certificate.exists() {
+                return Err(crate::ServerError::TlsConfiguration(
+                    format!("Certificate file does not exist: {}", tls.certificate.display())
+                ));
+            }
+            if !tls.private_key.exists() {
+                return Err(crate::ServerError::TlsConfiguration(
+                    format!("Private key file does not exist: {}", tls.private_key.display())
+                ));
+            }
+        }
+
+        Ok(config)
+    }
+}
+
+
+fn parse_size(size_str: &str) -> crate::Result<u64> {
+    let size_str = size_str.trim().to_uppercase();
+    
+    if let Some(captures) = regex::Regex::new(r"^(\d+(?:\.\d+)?)\s*([KMGT]?B?)$").unwrap().captures(&size_str) {
+        let number: f64 = captures[1].parse()
+            .map_err(|_| crate::ServerError::InvalidConfiguration(format!("Invalid size format: {}", size_str)))?;
+        
+        let unit = captures.get(2).map_or("", |m| m.as_str());
+        
+        let multiplier: u64 = match unit {
+            "" | "B" => 1,
+            "KB" => 1_000,
+            "MB" => 1_000_000,
+            "GB" => 1_000_000_000,
+            "TB" => 1_000_000_000_000,
+            _ => return Err(crate::ServerError::InvalidConfiguration(format!("Unknown size unit: {}", unit))),
+        };
+        let number = (number * multiplier as f64) as u64;
+        Ok(number)
+    } else {
+        Err(crate::ServerError::InvalidConfiguration(format!("Invalid size format: {}", size_str)))
+    }
+}
+
+fn matches_pattern(path: &str, pattern: &str) -> bool {
+    if pattern.ends_with("/*") {
+        let prefix = &pattern[..pattern.len() - 2];
+        path.starts_with(prefix)
+    } else if pattern.starts_with("*.") {
+        let suffix = &pattern[1..];
+        path.ends_with(suffix)
+    } else {
+        path == pattern
+    }
+}
+
+fn merge_configs(base: GurtConfig, override_config: GurtConfig) -> GurtConfig {
+    GurtConfig {
+        server: merge_server_configs(base.server, override_config.server),
+        tls: override_config.tls.or(base.tls),
+        logging: override_config.logging.or(base.logging),
+        security: override_config.security.or(base.security),
+        error_pages: override_config.error_pages.or(base.error_pages),
+        headers: override_config.headers.or(base.headers),
+    }
+}
+
+fn merge_server_configs(base: ServerConfig, override_config: ServerConfig) -> ServerConfig {
+    ServerConfig {
+        host: if override_config.host != default_host() { override_config.host } else { base.host },
+        port: if override_config.port != default_port() { override_config.port } else { base.port },
+        protocol_version: if override_config.protocol_version != default_protocol_version() { 
+            override_config.protocol_version 
+        } else { 
+            base.protocol_version 
+        },
+        alpn_identifier: if override_config.alpn_identifier != default_alpn_identifier() { 
+            override_config.alpn_identifier 
+        } else { 
+            base.alpn_identifier 
+        },
+        timeouts: override_config.timeouts.or(base.timeouts),
+        max_connections: if override_config.max_connections != default_max_connections() { 
+            override_config.max_connections 
+        } else { 
+            base.max_connections 
+        },
+        max_message_size: if override_config.max_message_size != default_max_message_size() { 
+            override_config.max_message_size 
+        } else { 
+            base.max_message_size 
+        },
+        base_directory: override_config.base_directory,
+        verbose: override_config.verbose,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::path::PathBuf;
+
+    #[test]
+    fn test_default_config_creation() {
+        let base_dir = PathBuf::from("/tmp");
+        let mut config = GurtConfig::default();
+        config.server.base_directory = Arc::new(base_dir.clone());
+        
+        assert_eq!(config.server.host, "127.0.0.1");
+        assert_eq!(config.server.port, 4878);
+        assert_eq!(config.server.protocol_version, "1.0.0");
+        assert_eq!(config.server.alpn_identifier, "GURT/1.0");
+        assert_eq!(*config.server.base_directory, base_dir);
+    }
+
+    #[test]
+    fn test_config_from_valid_toml() {
+        let toml_content = r#"
+[server]
+host = "0.0.0.0"
+port = 8080
+protocol_version = "2.0.0"
+alpn_identifier = "custom"
+max_connections = 1000
+max_message_size = "10MB"
+
+[security]
+rate_limit_requests = 60
+rate_limit_connections = 5
+"#;
+        
+        let base_dir = PathBuf::from("/tmp");
+        let config = GurtConfig::from_toml(toml_content, base_dir).unwrap();
+        
+        assert_eq!(config.server.host, "0.0.0.0");
+        assert_eq!(config.server.port, 8080);
+        assert_eq!(config.server.protocol_version, "2.0.0");
+        assert_eq!(config.server.alpn_identifier, "custom");
+        assert_eq!(config.server.max_connections, 1000);
+        
+        let security = config.security.unwrap();
+        assert_eq!(security.rate_limit_requests, 60);
+        assert_eq!(security.rate_limit_connections, 5);
+    }
+
+    #[test]
+    fn test_invalid_toml_returns_error() {
+        let invalid_toml = r#"
+[server
+host = "0.0.0.0"
+"#;
+        
+        let base_dir = PathBuf::from("/tmp");
+        let result = GurtConfig::from_toml(invalid_toml, base_dir);
+        
+        assert!(result.is_err());
+    }
+
+    #[test]
+    fn test_max_message_size_parsing() {
+        let config = GurtConfig::default();
+        
+        assert_eq!(parse_size("1024").unwrap(), 1024);
+        assert_eq!(parse_size("1KB").unwrap(), 1000);
+        assert_eq!(parse_size("1MB").unwrap(), 1000 * 1000);
+        assert_eq!(parse_size("1GB").unwrap(), 1000 * 1000 * 1000);
+        
+        assert!(parse_size("invalid").is_err());
+        
+        assert!(config.max_message_size_bytes().is_ok());
+    }
+
+    #[test]
+    fn test_tls_config_validation() {
+        let mut config = GurtConfig::default();
+        
+        config.tls = Some(TlsConfig {
+            certificate: PathBuf::from("/nonexistent/cert.pem"),
+            private_key: PathBuf::from("/nonexistent/key.pem"),
+        });
+        
+        assert!(config.tls.is_some());
+        let tls = config.tls.unwrap();
+        assert_eq!(tls.certificate, PathBuf::from("/nonexistent/cert.pem"));
+        assert_eq!(tls.private_key, PathBuf::from("/nonexistent/key.pem"));
+    }
+
+    #[test]
+    fn test_address_formatting() {
+        let config = GurtConfig::default();
+        assert_eq!(config.address(), "127.0.0.1:4878");
+        
+        let mut custom_config = GurtConfig::default();
+        custom_config.server.host = "0.0.0.0".to_string();
+        custom_config.server.port = 8080;
+        assert_eq!(custom_config.address(), "0.0.0.0:8080");
+    }
+
+    #[test]
+    fn test_timeout_getters() {
+        let config = GurtConfig::default();
+        
+        assert_eq!(config.get_handshake_timeout(), Duration::from_secs(5));
+        assert_eq!(config.get_request_timeout(), Duration::from_secs(30));
+        assert_eq!(config.get_connection_timeout(), Duration::from_secs(10));
+    }
+}

protocol/cli/src/error.rs

@@ -0,0 +1,38 @@
+use std::fmt;
+
+#[derive(Debug)]
+pub enum ServerError {
+    Io(std::io::Error),
+    InvalidPath(String),
+    InvalidConfiguration(String),
+    TlsConfiguration(String),
+    ServerStartup(String),
+}
+
+impl fmt::Display for ServerError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            ServerError::Io(err) => write!(f, "I/O error: {}", err),
+            ServerError::InvalidPath(path) => write!(f, "Invalid path: {}", path),
+            ServerError::InvalidConfiguration(msg) => write!(f, "Configuration error: {}", msg),
+            ServerError::TlsConfiguration(msg) => write!(f, "TLS configuration error: {}", msg),
+            ServerError::ServerStartup(msg) => write!(f, "Server startup error: {}", msg),
+        }
+    }
+}
+
+impl std::error::Error for ServerError {}
+
+impl From<std::io::Error> for ServerError {
+    fn from(err: std::io::Error) -> Self {
+        ServerError::Io(err)
+    }
+}
+
+impl From<gurt::GurtError> for ServerError {
+    fn from(err: gurt::GurtError) -> Self {
+        ServerError::ServerStartup(err.to_string())
+    }
+}
+
+pub type Result<T> = std::result::Result<T, ServerError>;

protocol/cli/src/handlers.rs

@@ -0,0 +1,197 @@
+use std::path::Path;
+
+pub trait FileHandler: Send + Sync {
+    fn can_handle(&self, path: &Path) -> bool;
+    fn get_content_type(&self, path: &Path) -> String;
+    fn handle_file(&self, path: &Path) -> crate::Result<Vec<u8>>;
+}
+
+pub struct DefaultFileHandler;
+
+impl FileHandler for DefaultFileHandler {
+    fn can_handle(&self, _path: &Path) -> bool {
+        true // Default
+    }
+
+    fn get_content_type(&self, path: &Path) -> String {
+        match path.extension().and_then(|ext| ext.to_str()) {
+            Some("html") | Some("htm") => "text/html".to_string(),
+            Some("css") => "text/css".to_string(),
+            Some("js") => "application/javascript".to_string(),
+            Some("json") => "application/json".to_string(),
+            Some("png") => "image/png".to_string(),
+            Some("jpg") | Some("jpeg") => "image/jpeg".to_string(),
+            Some("gif") => "image/gif".to_string(),
+            Some("svg") => "image/svg+xml".to_string(),
+            Some("ico") => "image/x-icon".to_string(),
+            Some("txt") => "text/plain".to_string(),
+            Some("xml") => "application/xml".to_string(),
+            Some("pdf") => "application/pdf".to_string(),
+            _ => "application/octet-stream".to_string(),
+        }
+    }
+
+    fn handle_file(&self, path: &Path) -> crate::Result<Vec<u8>> {
+        std::fs::read(path).map_err(crate::ServerError::from)
+    }
+}
+
+pub trait DirectoryHandler: Send + Sync {
+    fn handle_directory(&self, path: &Path, request_path: &str) -> crate::Result<String>;
+}
+
+pub struct DefaultDirectoryHandler;
+
+impl DirectoryHandler for DefaultDirectoryHandler {
+    fn handle_directory(&self, path: &Path, request_path: &str) -> crate::Result<String> {
+        let entries = std::fs::read_dir(path)?;
+        
+        let mut listing = String::from(include_str!("../templates/directory_listing_start.html"));
+
+        if request_path != "/" {
+            listing.push_str(include_str!("../templates/directory_parent_link.html"));
+        }
+
+        listing.push_str(include_str!("../templates/directory_content_start.html"));
+
+        for entry in entries.flatten() {
+            let file_name = entry.file_name();
+            let name = file_name.to_string_lossy();
+            let is_dir = entry.path().is_dir();
+            let display_name = if is_dir { 
+                format!("{}/", name) 
+            } else { 
+                name.to_string() 
+            };
+            let class = if is_dir { "dir" } else { "file" };
+            
+            listing.push_str(&format!(
+                r#"        <a href="{}" class="{}">{}</a>"#,
+                name, class, display_name
+            ));
+            listing.push('\n');
+        }
+        
+        listing.push_str(include_str!("../templates/directory_listing_end.html"));
+        Ok(listing)
+    }
+}
+
+pub fn get_404_html() -> &'static str {
+    include_str!("../templates/404.html")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::path::Path;
+
+    #[test]
+    fn test_default_file_handler_can_handle_any_file() {
+        let handler = DefaultFileHandler;
+        let path = Path::new("test.txt");
+        assert!(handler.can_handle(path));
+        
+        let path = Path::new("some/random/file");
+        assert!(handler.can_handle(path));
+    }
+
+    #[test]
+    fn test_content_type_detection() {
+        let handler = DefaultFileHandler;
+        
+        assert_eq!(handler.get_content_type(Path::new("index.html")), "text/html");
+        assert_eq!(handler.get_content_type(Path::new("style.css")), "text/css");
+        assert_eq!(handler.get_content_type(Path::new("script.js")), "application/javascript");
+        assert_eq!(handler.get_content_type(Path::new("data.json")), "application/json");
+        
+        assert_eq!(handler.get_content_type(Path::new("image.png")), "image/png");
+        assert_eq!(handler.get_content_type(Path::new("photo.jpg")), "image/jpeg");
+        assert_eq!(handler.get_content_type(Path::new("photo.jpeg")), "image/jpeg");
+        assert_eq!(handler.get_content_type(Path::new("icon.ico")), "image/x-icon");
+        assert_eq!(handler.get_content_type(Path::new("vector.svg")), "image/svg+xml");
+        
+        assert_eq!(handler.get_content_type(Path::new("readme.txt")), "text/plain");
+        assert_eq!(handler.get_content_type(Path::new("data.xml")), "application/xml");
+        assert_eq!(handler.get_content_type(Path::new("document.pdf")), "application/pdf");
+        
+        assert_eq!(handler.get_content_type(Path::new("file.unknown")), "application/octet-stream");
+        
+        assert_eq!(handler.get_content_type(Path::new("noextension")), "application/octet-stream");
+    }
+
+    #[test]
+    fn test_directory_handler_generates_valid_html() {
+        use std::fs;
+        use std::env;
+        
+        let temp_dir = env::temp_dir().join("gurty_test");
+        let _ = fs::create_dir_all(&temp_dir);
+        
+        let _ = fs::write(temp_dir.join("test.txt"), "test content");
+        let _ = fs::create_dir_all(temp_dir.join("subdir"));
+        
+        let handler = DefaultDirectoryHandler;
+        let result = handler.handle_directory(&temp_dir, "/test/");
+        
+        assert!(result.is_ok());
+        let html = result.unwrap();
+        
+        assert!(html.contains("<!DOCTYPE html>"));
+        assert!(html.contains("<title>Directory Listing</title>"));
+        assert!(html.contains("← Parent Directory"));
+        assert!(html.contains("test.txt"));
+        assert!(html.contains("subdir/"));
+        
+        let _ = fs::remove_dir_all(&temp_dir);
+    }
+
+    #[test]
+    fn test_directory_handler_root_path() {
+        use std::fs;
+        use std::env;
+        
+        let temp_dir = env::temp_dir().join("gurty_test_root");
+        let _ = fs::create_dir_all(&temp_dir);
+        
+        let handler = DefaultDirectoryHandler;
+        let result = handler.handle_directory(&temp_dir, "/");
+        
+        assert!(result.is_ok());
+        let html = result.unwrap();
+        
+        assert!(!html.contains("← Parent Directory"));
+        
+        let _ = fs::remove_dir_all(&temp_dir);
+    }
+
+    #[test]
+    fn test_get_404_html_content() {
+        let html = get_404_html();
+        
+        assert!(html.contains("<!DOCTYPE html>"));
+        assert!(html.contains("404 Page Not Found"));
+        assert!(html.contains("The requested path was not found"));
+        assert!(html.contains("Back to home"));
+    }
+
+    #[test]
+    fn test_directory_handler_with_empty_directory() {
+        use std::fs;
+        use std::env;
+        
+        let temp_dir = env::temp_dir().join("gurty_test_empty");
+        let _ = fs::create_dir_all(&temp_dir);
+        
+        let handler = DefaultDirectoryHandler;
+        let result = handler.handle_directory(&temp_dir, "/empty/");
+        
+        assert!(result.is_ok());
+        let html = result.unwrap();
+        
+        assert!(html.contains("<!DOCTYPE html>"));
+        assert!(html.contains("Directory Listing"));
+        
+        let _ = fs::remove_dir_all(&temp_dir);
+    }
+}

protocol/cli/src/lib.rs

@@ -0,0 +1,10 @@
+pub mod cli;
+pub mod config;
+pub mod error;
+pub mod security;
+pub mod server;
+pub mod request_handler;
+pub mod command_handler;
+pub mod handlers;
+
+pub use error::{Result, ServerError};

protocol/cli/src/main.rs

@@ -1,323 +1,23 @@
-use clap::{Parser, Subcommand};
-use colored::Colorize;
-use gurt::prelude::*;
-use std::path::PathBuf;
-use tracing::error;
-use tracing_subscriber;
-
-#[derive(Parser)]
-#[command(name = "server")]
-#[command(about = "GURT Protocol Server")]
-#[command(version = "1.0.0")]
-struct Cli {
-    #[command(subcommand)]
-    command: Commands,
-}
-
-#[derive(Subcommand)]
-enum Commands {
-    Serve {
-        #[arg(short, long, default_value_t = 4878)]
-        port: u16,
-        
-        #[arg(long, default_value = "127.0.0.1")]
-        host: String,
-        
-        #[arg(short, long, default_value = ".")]
-        dir: PathBuf,
-        
-        #[arg(short, long)]
-        verbose: bool,
-        
-        #[arg(long, help = "Path to TLS certificate file")]
-        cert: Option<PathBuf>,
-        
-        #[arg(long, help = "Path to TLS private key file")]
-        key: Option<PathBuf>,
-    }
-}
+use clap::Parser;
+use gurty::{
+    cli::{Cli, Commands},
+    command_handler::{CommandHandler, CommandHandlerBuilder},
+    Result,
+};
 
 #[tokio::main]
 async fn main() -> Result<()> {
     let cli = Cli::parse();
     
     match cli.command {
-        Commands::Serve { port, host, dir, verbose, cert, key } => {
-            if verbose {
-                tracing_subscriber::fmt()
-                    .with_max_level(tracing::Level::DEBUG)
-                    .init();
-            } else {
-                tracing_subscriber::fmt()
-                    .with_max_level(tracing::Level::INFO)
-                    .init();
-            }
+        Commands::Serve(serve_cmd) => {
+            let handler = CommandHandlerBuilder::new()
+                .with_logging(serve_cmd.verbose)
+                .initialize_logging()
+                .build_serve_handler(serve_cmd);
             
-            println!("{}", "GURT Protocol Server".bright_cyan().bold());
-            println!("{} {}:{}", "Listening on".bright_blue(), host, port);
-            println!("{} {}", "Serving from".bright_blue(), dir.display());
-            
-            let server = create_file_server(dir, cert, key)?;
-            let addr = format!("{}:{}", host, port);
-            
-            if let Err(e) = server.listen(&addr).await {
-                error!("Server error: {}", e);
-                std::process::exit(1);
-            }
+            handler.execute().await
         }
     }
-    
-    Ok(())
 }
 
-fn create_file_server(base_dir: PathBuf, cert_path: Option<PathBuf>, key_path: Option<PathBuf>) -> Result<GurtServer> {
-    let base_dir = std::sync::Arc::new(base_dir);
-    
-    let server = match (cert_path, key_path) {
-        (Some(cert), Some(key)) => {
-            println!("TLS using certificate: {}", cert.display());
-            GurtServer::with_tls_certificates(
-                cert.to_str().ok_or_else(|| GurtError::invalid_message("Invalid certificate path"))?,
-                key.to_str().ok_or_else(|| GurtError::invalid_message("Invalid key path"))?
-            )?
-        }
-        (Some(_), None) => {
-            return Err(GurtError::invalid_message("Certificate provided but no key file specified (use --key)"));
-        }
-        (None, Some(_)) => {
-            return Err(GurtError::invalid_message("Key provided but no certificate file specified (use --cert)"));
-        }
-        (None, None) => {
-            return Err(GurtError::invalid_message("GURT protocol requires TLS encryption. Please provide --cert and --key parameters."));
-        }
-    };
-    
-    let server = server
-        .get("/", {
-            let base_dir = base_dir.clone();
-            move |_| {
-                let base_dir = base_dir.clone();
-                async move {
-                    // Try to serve index.html if it exists
-                    let index_path = base_dir.join("index.html");
-
-                    if index_path.exists() && index_path.is_file() {
-                        match std::fs::read_to_string(&index_path) {
-                            Ok(content) => {
-                                return Ok(GurtResponse::ok()
-                                    .with_header("Content-Type", "text/html")
-                                    .with_string_body(content));
-                            }
-                            Err(_) => {
-                                // Fall through to directory listing
-                            }
-                        }
-                    }
-                    
-                    // No index.html found, show directory listing
-                    match std::fs::read_dir(base_dir.as_ref()) {
-                        Ok(entries) => {
-                            let mut listing = String::from(r#"
-<!DOCTYPE html>
-<html>
-<head>
-    <title>Directory Listing</title>
-    <style>
-        body { font-sans m-[40px] }
-        .dir { font-bold text-[#0066cc] }
-    </style>
-</head>
-<body>
-    <h1>Directory Listing</h1>
-    <div style="flex flex-col gap-2">
-"#);
-                            for entry in entries.flatten() {
-                                let file_name = entry.file_name();
-                                let name = file_name.to_string_lossy();
-                                let is_dir = entry.path().is_dir();
-                                let display_name = if is_dir { format!("{}/", name) } else { name.to_string() };
-                                let class = if is_dir { "style=\"dir\"" } else { "" };
-                                
-                                listing.push_str(&format!(
-                                    r#"    <a {} href="/{}">{}</a>"#,
-                                    class, name, display_name
-                                ));
-                                listing.push('\n');
-                            }
-                            
-                            listing.push_str("</div></body>\n</html>");
-
-                            Ok(GurtResponse::ok()
-                                .with_header("Content-Type", "text/html")
-                                .with_string_body(listing))
-                        }
-                        Err(_) => {
-                            Ok(GurtResponse::internal_server_error()
-                                .with_header("Content-Type", "text/plain")
-                                .with_string_body("Failed to read directory"))
-                        }
-                    }
-                }
-            }
-        })
-        .get("/*", {
-            let base_dir = base_dir.clone();
-            move |ctx| {
-                let base_dir = base_dir.clone();
-                let path = ctx.path().to_string();
-                async move {
-                    let mut relative_path = path.strip_prefix('/').unwrap_or(&path).to_string();
-                    // Remove any leading slashes to ensure relative path
-                    while relative_path.starts_with('/') || relative_path.starts_with('\\') {
-                        relative_path = relative_path[1..].to_string();
-                    }
-                    // If the path is now empty, use "."
-                    let relative_path = if relative_path.is_empty() { ".".to_string() } else { relative_path };
-                    let file_path = base_dir.join(&relative_path);
-
-                    match file_path.canonicalize() {
-                        Ok(canonical_path) => {
-                            let canonical_base = match base_dir.canonicalize() {
-                                Ok(base) => base,
-                                Err(_) => {
-                                    return Ok(GurtResponse::internal_server_error()
-                                        .with_header("Content-Type", "text/plain")
-                                        .with_string_body("Server configuration error"));
-                                }
-                            };
-
-                            if !canonical_path.starts_with(&canonical_base) {
-                                return Ok(GurtResponse::bad_request()
-                                    .with_header("Content-Type", "text/plain")
-                                    .with_string_body("Access denied: Path outside served directory"));
-                            }
-                            
-                            if canonical_path.is_file() {
-                                match std::fs::read(&canonical_path) {
-                                    Ok(content) => {
-                                        let content_type = get_content_type(&canonical_path);
-                                        Ok(GurtResponse::ok()
-                                            .with_header("Content-Type", &content_type)
-                                            .with_body(content))
-                                    }
-                                    Err(_) => {
-                                        Ok(GurtResponse::internal_server_error()
-                                            .with_header("Content-Type", "text/plain")
-                                            .with_string_body("Failed to read file"))
-                                    }
-                                }
-                            } else if canonical_path.is_dir() {
-                                let index_path = canonical_path.join("index.html");
-                                if index_path.is_file() {
-                                    match std::fs::read_to_string(&index_path) {
-                                        Ok(content) => {
-                                            Ok(GurtResponse::ok()
-                                                .with_header("Content-Type", "text/html")
-                                                .with_string_body(content))
-                                        }
-                                        Err(_) => {
-                                            Ok(GurtResponse::internal_server_error()
-                                                .with_header("Content-Type", "text/plain")
-                                                .with_string_body("Failed to read index file"))
-                                        }
-                                    }
-                                } else {
-                                    match std::fs::read_dir(&canonical_path) {
-                                        Ok(entries) => {
-                                            let mut listing = String::from(r#"
-<!DOCTYPE html>
-<html>
-<head>
-    <title>Directory Listing</title>
-    <style>
-        body { font-sans m-[40px] }
-        .dir { font-bold text-[#0066cc] }
-    </style>
-</head>
-<body>
-    <h1>Directory Listing</h1>
-    <p><a href="../">← Parent Directory</a></p>
-    <div style="flex flex-col gap-2">
-"#);
-                                            for entry in entries.flatten() {
-                                                let file_name = entry.file_name();
-                                                let name = file_name.to_string_lossy();
-                                                let is_dir = entry.path().is_dir();
-                                                let display_name = if is_dir { format!("{}/", name) } else { name.to_string() };
-                                                let class = if is_dir { "style=\"dir\"" } else { "" };
-                                                
-                                                listing.push_str(&format!(
-                                                    r#"    <a {} href="{}">{}</a>"#,
-                                                    class, name, display_name
-                                                ));
-                                                listing.push('\n');
-                                            }
-                                            
-                                            listing.push_str("</div></body>\n</html>");
-
-                                            Ok(GurtResponse::ok()
-                                                .with_header("Content-Type", "text/html")
-                                                .with_string_body(listing))
-                                        }
-                                        Err(_) => {
-                                            Ok(GurtResponse::internal_server_error()
-                                                .with_header("Content-Type", "text/plain")
-                                                .with_string_body("Failed to read directory"))
-                                        }
-                                    }
-                                }
-                            } else {
-                                // File not found
-                                Ok(GurtResponse::not_found()
-                                    .with_header("Content-Type", "text/html")
-                                    .with_string_body(get_404_html()))
-                            }
-                        }
-                        Err(_e) => {
-                            Ok(GurtResponse::not_found()
-                                .with_header("Content-Type", "text/html")
-                                .with_string_body(get_404_html()))
-                        }
-                    }
-                }
-            }
-        });
-    
-    Ok(server)
-}
-
-fn get_404_html() -> &'static str {
-    r#"<!DOCTYPE html>
-<html>
-<head>
-    <title>404 Not Found</title>
-    <style>
-        body { font-sans m-[40px] text-center }
-    </style>
-</head>
-<body>
-    <h1>404 Page Not Found</h1>
-    <p>The requested path was not found on this GURT server.</p>
-    <p><a href="/">Back to home</a></p>
-</body>
-</html>
-"#
-}
-
-fn get_content_type(path: &std::path::Path) -> String {
-    match path.extension().and_then(|ext| ext.to_str()) {
-        Some("html") | Some("htm") => "text/html".to_string(),
-        Some("css") => "text/css".to_string(),
-        Some("js") => "application/javascript".to_string(),
-        Some("json") => "application/json".to_string(),
-        Some("png") => "image/png".to_string(),
-        Some("jpg") | Some("jpeg") => "image/jpeg".to_string(),
-        Some("gif") => "image/gif".to_string(),
-        Some("svg") => "image/svg+xml".to_string(),
-        Some("ico") => "image/x-icon".to_string(),
-        Some("txt") => "text/plain".to_string(),
-        Some("xml") => "application/xml".to_string(),
-        Some("pdf") => "application/pdf".to_string(),
-        _ => "application/octet-stream".to_string(),
-    }
-}

protocol/cli/src/request_handler.rs

@@ -0,0 +1,560 @@
+use crate::{
+    handlers::{FileHandler, DirectoryHandler, DefaultFileHandler, DefaultDirectoryHandler},
+    config::GurtConfig,
+    security::SecurityMiddleware,
+};
+use gurt::prelude::*;
+use std::path::Path;
+use std::sync::Arc;
+use tracing;
+
+pub struct RequestHandlerBuilder {
+    file_handler: Arc<dyn FileHandler>,
+    directory_handler: Arc<dyn DirectoryHandler>,
+    base_directory: std::path::PathBuf,
+    config: Option<Arc<GurtConfig>>,
+}
+
+impl RequestHandlerBuilder {
+    pub fn new<P: AsRef<Path>>(base_directory: P) -> Self {
+        Self {
+            file_handler: Arc::new(DefaultFileHandler),
+            directory_handler: Arc::new(DefaultDirectoryHandler),
+            base_directory: base_directory.as_ref().to_path_buf(),
+            config: None,
+        }
+    }
+
+    pub fn with_file_handler<H: FileHandler + 'static>(mut self, handler: H) -> Self {
+        self.file_handler = Arc::new(handler);
+        self
+    }
+
+    pub fn with_directory_handler<H: DirectoryHandler + 'static>(mut self, handler: H) -> Self {
+        self.directory_handler = Arc::new(handler);
+        self
+    }
+
+    pub fn with_config(mut self, config: Arc<GurtConfig>) -> Self {
+        self.config = Some(config);
+        self
+    }
+
+    pub fn build(self) -> RequestHandler {
+        let security = self.config.as_ref().map(|config| SecurityMiddleware::new(config.clone()));
+        
+        RequestHandler {
+            file_handler: self.file_handler,
+            directory_handler: self.directory_handler,
+            base_directory: self.base_directory,
+            config: self.config,
+            security,
+        }
+    }
+}
+
+pub struct RequestHandler {
+    file_handler: Arc<dyn FileHandler>,
+    directory_handler: Arc<dyn DirectoryHandler>,
+    base_directory: std::path::PathBuf,
+    config: Option<Arc<GurtConfig>>,
+    security: Option<SecurityMiddleware>,
+}
+
+impl RequestHandler {
+    pub fn builder<P: AsRef<Path>>(base_directory: P) -> RequestHandlerBuilder {
+        RequestHandlerBuilder::new(base_directory)
+    }
+
+    fn apply_custom_error_page(&self, mut response: GurtResponse) -> GurtResponse {
+        if response.status_code >= 400 {
+            let custom_content = self.get_custom_error_page(response.status_code)
+                .unwrap_or_else(|| self.get_fallback_error_page(response.status_code));
+            
+            response.body = custom_content.into_bytes();
+            response = response.with_header("Content-Type", "text/html");
+            tracing::debug!("Applied error page for status {}", response.status_code);
+        }
+        response
+    }
+
+    fn get_custom_error_page(&self, status_code: u16) -> Option<String> {
+        if let Some(config) = &self.config {
+            if let Some(error_pages) = &config.error_pages {
+                error_pages.get_page_content(status_code, &self.base_directory)
+            } else {
+                None
+            }
+        } else {
+            None
+        }
+    }
+
+    fn get_fallback_error_page(&self, status_code: u16) -> String {
+        let (title, message) = match status_code {
+            400 => ("Bad Request", "The request could not be understood by the server."),
+            401 => ("Unauthorized", "Authentication is required to access this resource."),
+            403 => ("Forbidden", "Access to this resource is denied by server policy."),
+            404 => ("Not Found", "The requested resource was not found on this server."),
+            405 => ("Method Not Allowed", "The request method is not allowed for this resource."),
+            429 => ("Too Many Requests", "You have exceeded the rate limit. Please try again later."),
+            500 => ("Internal Server Error", "The server encountered an error processing your request."),
+            502 => ("Bad Gateway", "The server received an invalid response from an upstream server."),
+            503 => ("Service Unavailable", "The server is temporarily unavailable. Please try again later."),
+            504 => ("Gateway Timeout", "The server did not receive a timely response from an upstream server."),
+            _ => ("Error", "An error occurred while processing your request."),
+        };
+
+        format!(include_str!("../templates/error.html"), status_code, title, status_code, title, message)
+    }
+
+    pub fn check_security(&self, ctx: &ServerContext) -> Option<std::result::Result<GurtResponse, GurtError>> {
+        if let Some(security) = &self.security {
+            let client_ip = ctx.client_ip();
+            let method = ctx.method();
+
+            if !security.is_method_allowed(method) {
+                tracing::warn!("Method {} not allowed from {}", method, client_ip);
+                let response = security.create_method_not_allowed_response()
+                    .map(|r| self.apply_global_headers(r));
+                return Some(response);
+            }
+
+            if !security.check_rate_limit(client_ip) {
+                let response = security.create_rate_limit_response()
+                    .map(|r| self.apply_global_headers(r));
+                return Some(response);
+            }
+
+            if !security.check_connection_limit(client_ip) {
+                let response = security.create_rate_limit_response()
+                    .map(|r| self.apply_global_headers(r));
+                return Some(response);
+            }
+        }
+
+        None
+    }
+
+    pub fn register_connection(&self, client_ip: std::net::IpAddr) {
+        if let Some(security) = &self.security {
+            security.register_connection(client_ip);
+        }
+    }
+
+    pub fn unregister_connection(&self, client_ip: std::net::IpAddr) {
+        if let Some(security) = &self.security {
+            security.unregister_connection(client_ip);
+        }
+    }
+
+    fn is_file_denied(&self, file_path: &Path) -> bool {
+        if let Some(config) = &self.config {
+            let path_str = file_path.to_string_lossy();
+            
+            let relative_path = if let Ok(canonical_file) = file_path.canonicalize() {
+                if let Ok(canonical_base) = self.base_directory.canonicalize() {
+                    canonical_file.strip_prefix(&canonical_base)
+                        .map(|p| p.to_string_lossy().to_string())
+                        .unwrap_or_else(|_| path_str.to_string())
+                } else {
+                    path_str.to_string()
+                }
+            } else {
+                path_str.to_string()
+            };
+
+            let is_denied = config.should_deny_file(&path_str) || config.should_deny_file(&relative_path);
+            
+            if is_denied {
+                tracing::warn!("File access denied by security policy: {}", relative_path);
+            }
+            
+            is_denied
+        } else {
+            false
+        }
+    }
+
+    fn apply_global_headers(&self, mut response: GurtResponse) -> GurtResponse {
+        response = self.apply_custom_error_page(response);
+        
+        if let Some(config) = &self.config {
+            if let Some(headers) = &config.headers {
+                for (key, value) in headers {
+                    response = response.with_header(key, value);
+                }
+            }
+        }
+        response
+    }
+
+    fn create_forbidden_response(&self) -> std::result::Result<GurtResponse, GurtError> {
+        let response = GurtResponse::forbidden()
+            .with_header("Content-Type", "text/html");
+        
+        Ok(self.apply_global_headers(response))
+    }
+
+    pub async fn handle_root_request_with_context(&self, ctx: ServerContext) -> std::result::Result<GurtResponse, GurtError> {
+        let client_ip = ctx.client_ip();
+        
+        self.register_connection(client_ip);
+        
+        if let Some(security_response) = self.check_security(&ctx) {
+            self.unregister_connection(client_ip);
+            return security_response;
+        }
+        
+        let result = self.handle_root_request().await;
+        self.unregister_connection(client_ip);
+        result
+    }
+
+    pub async fn handle_file_request_with_context(&self, request_path: &str, ctx: ServerContext) -> std::result::Result<GurtResponse, GurtError> {
+        let client_ip = ctx.client_ip();
+        
+        self.register_connection(client_ip);
+        
+        if let Some(security_response) = self.check_security(&ctx) {
+            self.unregister_connection(client_ip);
+            return security_response;
+        }
+        
+        let result = self.handle_file_request(request_path).await;
+        self.unregister_connection(client_ip);
+        result
+    }
+
+    pub async fn handle_method_request_with_context(&self, ctx: ServerContext) -> std::result::Result<GurtResponse, GurtError> {
+        let client_ip = ctx.client_ip();
+        let method = ctx.method();
+        
+        self.register_connection(client_ip);
+        
+        if let Some(security_response) = self.check_security(&ctx) {
+            self.unregister_connection(client_ip);
+            return security_response;
+        }
+        
+        let result = match method {
+            gurt::message::GurtMethod::GET => {
+                if ctx.path() == "/" {
+                    self.handle_root_request().await
+                } else {
+                    self.handle_file_request(ctx.path()).await
+                }
+            }
+            gurt::message::GurtMethod::HEAD => {
+                let mut response = if ctx.path() == "/" {
+                    self.handle_root_request().await?
+                } else {
+                    self.handle_file_request(ctx.path()).await?
+                };
+                response.body = Vec::new();
+                Ok(response)
+            }
+            gurt::message::GurtMethod::OPTIONS => {
+                let allowed_methods = if let Some(config) = &self.config {
+                    if let Some(security) = &config.security {
+                        security.allowed_methods.join(", ")
+                    } else {
+                        "GET, POST, PUT, DELETE, HEAD, OPTIONS, PATCH".to_string()
+                    }
+                } else {
+                    "GET, POST, PUT, DELETE, HEAD, OPTIONS, PATCH".to_string()
+                };
+                
+                let response = GurtResponse::ok()
+                    .with_header("Allow", &allowed_methods)
+                    .with_header("Content-Type", "text/plain")
+                    .with_string_body("Allowed methods");
+                Ok(self.apply_global_headers(response))
+            }
+            _ => {
+                let response = GurtResponse::new(gurt::protocol::GurtStatusCode::MethodNotAllowed)
+                    .with_header("Content-Type", "text/html");
+                Ok(self.apply_global_headers(response))
+            }
+        };
+        
+        self.unregister_connection(client_ip);
+        result
+    }
+
+    pub async fn handle_root_request(&self) -> std::result::Result<GurtResponse, GurtError> {
+        let index_path = self.base_directory.join("index.html");
+
+        if index_path.exists() && index_path.is_file() {
+            if self.is_file_denied(&index_path) {
+                return self.create_forbidden_response();
+            }
+
+            match self.file_handler.handle_file(&index_path) {
+                Ok(content) => {
+                    let content_type = self.file_handler.get_content_type(&index_path);
+                    let response = GurtResponse::ok()
+                        .with_header("Content-Type", &content_type)
+                        .with_body(content);
+                    return Ok(self.apply_global_headers(response));
+                }
+                Err(_) => {
+                    // fall
+                }
+            }
+        }
+
+        match self.directory_handler.handle_directory(&self.base_directory, "/") {
+            Ok(listing) => {
+                let response = GurtResponse::ok()
+                    .with_header("Content-Type", "text/html")
+                    .with_string_body(listing);
+                Ok(self.apply_global_headers(response))
+            }
+            Err(_) => {
+                let response = GurtResponse::internal_server_error()
+                    .with_header("Content-Type", "text/html");
+                Ok(self.apply_global_headers(response))
+            }
+        }
+    }
+
+    pub async fn handle_file_request(&self, request_path: &str) -> std::result::Result<GurtResponse, GurtError> {
+        let mut relative_path = request_path.strip_prefix('/').unwrap_or(request_path).to_string();
+        
+        while relative_path.starts_with('/') || relative_path.starts_with('\\') {
+            relative_path = relative_path[1..].to_string();
+        }
+        
+        let relative_path = if relative_path.is_empty() { 
+            ".".to_string() 
+        } else { 
+            relative_path 
+        };
+        
+        let file_path = self.base_directory.join(&relative_path);
+
+        if self.is_file_denied(&file_path) {
+            return self.create_forbidden_response();
+        }
+
+        match file_path.canonicalize() {
+            Ok(canonical_path) => {
+                let canonical_base = match self.base_directory.canonicalize() {
+                    Ok(base) => base,
+                    Err(_) => {
+                        return Ok(GurtResponse::internal_server_error()
+                            .with_header("Content-Type", "text/html"));
+                    }
+                };
+
+                if !canonical_path.starts_with(&canonical_base) {
+                    let response = GurtResponse::bad_request()
+                        .with_header("Content-Type", "text/html");
+                    return Ok(self.apply_global_headers(response));
+                }
+                
+                if self.is_file_denied(&canonical_path) {
+                    return self.create_forbidden_response();
+                }
+                
+                if canonical_path.is_file() {
+                    self.handle_file_response(&canonical_path).await
+                } else if canonical_path.is_dir() {
+                    self.handle_directory_response(&canonical_path, request_path).await
+                } else {
+                    self.handle_not_found_response().await
+                }
+            }
+            Err(_) => {
+                self.handle_not_found_response().await
+            }
+        }
+    }
+
+    async fn handle_file_response(&self, path: &Path) -> std::result::Result<GurtResponse, GurtError> {
+        match self.file_handler.handle_file(path) {
+            Ok(content) => {
+                let content_type = self.file_handler.get_content_type(path);
+                let response = GurtResponse::ok()
+                    .with_header("Content-Type", &content_type)
+                    .with_body(content);
+                Ok(self.apply_global_headers(response))
+            }
+            Err(_) => {
+                let response = GurtResponse::internal_server_error()
+                    .with_header("Content-Type", "text/html");
+                Ok(self.apply_global_headers(response))
+            }
+        }
+    }
+
+    async fn handle_directory_response(&self, canonical_path: &Path, request_path: &str) -> std::result::Result<GurtResponse, GurtError> {
+        let index_path = canonical_path.join("index.html");
+        if index_path.is_file() {
+            self.handle_file_response(&index_path).await
+        } else {
+            match self.directory_handler.handle_directory(canonical_path, request_path) {
+                Ok(listing) => {
+                    let response = GurtResponse::ok()
+                        .with_header("Content-Type", "text/html")
+                        .with_string_body(listing);
+                    Ok(self.apply_global_headers(response))
+                }
+                Err(_) => {
+                    let response = GurtResponse::internal_server_error()
+                        .with_header("Content-Type", "text/html");
+                    Ok(self.apply_global_headers(response))
+                }
+            }
+        }
+    }
+
+    async fn handle_not_found_response(&self) -> std::result::Result<GurtResponse, GurtError> {
+        let content = self.get_custom_error_page(404)
+            .unwrap_or_else(|| crate::handlers::get_404_html().to_string());
+        
+        let response = GurtResponse::not_found()
+            .with_header("Content-Type", "text/html")
+            .with_string_body(content);
+        Ok(self.apply_global_headers(response))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use gurt::GurtStatusCode;
+    use std::fs;
+    use std::env;
+
+    fn create_test_handler() -> RequestHandler {
+        let temp_dir = env::temp_dir().join("gurty_request_handler_test");
+        let _ = fs::create_dir_all(&temp_dir);
+        
+        RequestHandler::builder(&temp_dir).build()
+    }
+
+    fn create_test_handler_with_config() -> RequestHandler {
+        let temp_dir = env::temp_dir().join("gurty_request_handler_test_config");
+        let _ = fs::create_dir_all(&temp_dir);
+        
+        let config = Arc::new(GurtConfig::default());
+        RequestHandler::builder(&temp_dir)
+            .with_config(config)
+            .build()
+    }
+
+    #[test]
+    fn test_request_handler_builder() {
+        let temp_dir = env::temp_dir().join("gurty_builder_test");
+        let _ = fs::create_dir_all(&temp_dir);
+        
+        let handler = RequestHandler::builder(&temp_dir).build();
+        
+        assert_eq!(handler.base_directory, temp_dir);
+        assert!(handler.config.is_none());
+        assert!(handler.security.is_none());
+        
+        let _ = fs::remove_dir_all(&temp_dir);
+    }
+
+    #[test]
+    fn test_request_handler_builder_with_config() {
+        let temp_dir = env::temp_dir().join("gurty_builder_config_test");
+        let _ = fs::create_dir_all(&temp_dir);
+        
+        let config = Arc::new(GurtConfig::default());
+        let handler = RequestHandler::builder(&temp_dir)
+            .with_config(config.clone())
+            .build();
+        
+        assert!(handler.config.is_some());
+        assert!(handler.security.is_some());
+        
+        let _ = fs::remove_dir_all(&temp_dir);
+    }
+
+    #[test]
+    fn test_fallback_error_page_generation() {
+        let handler = create_test_handler();
+        
+        let error_404 = handler.get_fallback_error_page(404);
+        assert!(error_404.contains("404 Not Found"));
+        assert!(error_404.contains("not found"));
+        
+        let error_500 = handler.get_fallback_error_page(500);
+        assert!(error_500.contains("500 Internal Server Error"));
+        assert!(error_500.contains("processing your request"));
+        
+        let error_429 = handler.get_fallback_error_page(429);
+        assert!(error_429.contains("429 Too Many Requests"));
+        assert!(error_429.contains("rate limit"));
+    }
+
+    #[test]
+    fn test_custom_error_page_with_config() {
+        let handler = create_test_handler_with_config();
+        
+        let result = handler.get_custom_error_page(404);
+        assert!(result.is_none());
+    }
+
+    #[test]
+    fn test_apply_global_headers_without_config() {
+        let handler = create_test_handler();
+        let response = GurtResponse::ok();
+        
+        let modified_response = handler.apply_global_headers(response);
+        
+        assert_eq!(modified_response.status_code, 200);
+    }
+
+    #[test]
+    fn test_apply_global_headers_with_config() {
+        let temp_dir = env::temp_dir().join("gurty_headers_test");
+        let _ = fs::create_dir_all(&temp_dir);
+        
+        let mut config = GurtConfig::default();
+        let mut headers = std::collections::HashMap::new();
+        headers.insert("X-Test-Header".to_string(), "test-value".to_string());
+        config.headers = Some(headers);
+        
+        let handler = RequestHandler::builder(&temp_dir)
+            .with_config(Arc::new(config))
+            .build();
+        
+        let response = GurtResponse::ok();
+        let modified_response = handler.apply_global_headers(response);
+        
+        assert!(modified_response.headers.contains_key("x-test-header"));
+        assert_eq!(modified_response.headers.get("x-test-header").unwrap(), "test-value");
+        
+        let _ = fs::remove_dir_all(&temp_dir);
+    }
+
+    #[test]
+    fn test_apply_custom_error_page() {
+        let handler = create_test_handler();
+        let mut response = GurtResponse::new(GurtStatusCode::NotFound);
+        response.body = b"Not Found".to_vec();
+        
+        let modified_response = handler.apply_custom_error_page(response);
+        
+        assert!(modified_response.status_code >= 400);
+        let body_str = String::from_utf8_lossy(&modified_response.body);
+        assert!(body_str.contains("html"));
+    }
+
+    #[test]
+    fn test_apply_custom_error_page_for_success() {
+        let handler = create_test_handler();
+        let mut response = GurtResponse::ok();
+        response.body = b"Success".to_vec();
+        
+        let modified_response = handler.apply_custom_error_page(response);
+        
+        assert_eq!(modified_response.status_code, 200);
+        assert_eq!(modified_response.body, b"Success".to_vec());
+    }
+}

protocol/cli/src/security.rs

@@ -0,0 +1,288 @@
+use crate::config::GurtConfig;
+use gurt::{prelude::*, GurtMethod, GurtStatusCode};
+use std::collections::HashMap;
+use std::net::IpAddr;
+use std::sync::{Arc, Mutex};
+use std::time::{Duration, Instant};
+use tracing::{warn, debug};
+
+#[derive(Debug)]
+pub struct RateLimitData {
+    requests: Vec<Instant>,
+    connections: u32,
+}
+
+impl RateLimitData {
+    fn new() -> Self {
+        Self {
+            requests: Vec::new(),
+            connections: 0,
+        }
+    }
+
+    fn cleanup_old_requests(&mut self, window: Duration) {
+        let cutoff = Instant::now() - window;
+        self.requests.retain(|&request_time| request_time > cutoff);
+    }
+
+    fn add_request(&mut self) {
+        self.requests.push(Instant::now());
+    }
+
+    fn request_count(&self) -> usize {
+        self.requests.len()
+    }
+
+    fn increment_connections(&mut self) {
+        self.connections += 1;
+    }
+
+    fn decrement_connections(&mut self) {
+        if self.connections > 0 {
+            self.connections -= 1;
+        }
+    }
+
+    fn connection_count(&self) -> u32 {
+        self.connections
+    }
+}
+
+pub struct SecurityMiddleware {
+    config: Arc<GurtConfig>,
+    rate_limit_data: Arc<Mutex<HashMap<IpAddr, RateLimitData>>>,
+}
+
+impl SecurityMiddleware {
+    pub fn new(config: Arc<GurtConfig>) -> Self {
+        Self {
+            config,
+            rate_limit_data: Arc::new(Mutex::new(HashMap::new())),
+        }
+    }
+
+    pub fn is_method_allowed(&self, method: &GurtMethod) -> bool {
+        if let Some(security) = &self.config.security {
+            let method_str = method.to_string();
+            security.allowed_methods.contains(&method_str)
+        } else {
+            true
+        }
+    }
+
+    pub fn check_rate_limit(&self, client_ip: IpAddr) -> bool {
+        if let Some(security) = &self.config.security {
+            let mut data = self.rate_limit_data.lock().unwrap();
+            let rate_data = data.entry(client_ip).or_insert_with(RateLimitData::new);
+            
+            rate_data.cleanup_old_requests(Duration::from_secs(60));
+            
+            if rate_data.request_count() >= security.rate_limit_requests as usize {
+                warn!("Rate limit exceeded for IP {}: {} requests in the last minute", 
+                      client_ip, rate_data.request_count());
+                return false;
+            }
+            
+            rate_data.add_request();
+            debug!("Request from {}: {}/{} requests in the last minute", 
+                   client_ip, rate_data.request_count(), security.rate_limit_requests);
+        }
+        
+        true
+    }
+
+    pub fn check_connection_limit(&self, client_ip: IpAddr) -> bool {
+        if let Some(security) = &self.config.security {
+            let mut data = self.rate_limit_data.lock().unwrap();
+            let rate_data = data.entry(client_ip).or_insert_with(RateLimitData::new);
+            
+            if rate_data.connection_count() >= security.rate_limit_connections {
+                warn!("Connection limit exceeded for IP {}: {} concurrent connections", 
+                      client_ip, rate_data.connection_count());
+                return false;
+            }
+        }
+        
+        true
+    }
+
+    pub fn register_connection(&self, client_ip: IpAddr) {
+        if self.config.security.is_some() {
+            let mut data = self.rate_limit_data.lock().unwrap();
+            let rate_data = data.entry(client_ip).or_insert_with(RateLimitData::new);
+            rate_data.increment_connections();
+            debug!("Connection registered for {}: {} concurrent connections", 
+                   client_ip, rate_data.connection_count());
+        }
+    }
+
+    pub fn unregister_connection(&self, client_ip: IpAddr) {
+        if self.config.security.is_some() {
+            let mut data = self.rate_limit_data.lock().unwrap();
+            if let Some(rate_data) = data.get_mut(&client_ip) {
+                rate_data.decrement_connections();
+                debug!("Connection unregistered for {}: {} concurrent connections remaining", 
+                       client_ip, rate_data.connection_count());
+            }
+        }
+    }
+
+    pub fn create_method_not_allowed_response(&self) -> std::result::Result<GurtResponse, GurtError> {
+        let response = GurtResponse::new(GurtStatusCode::MethodNotAllowed)
+            .with_header("Content-Type", "text/html");
+        Ok(response)
+    }
+
+    pub fn create_rate_limit_response(&self) -> std::result::Result<GurtResponse, GurtError> {
+        let response = GurtResponse::new(GurtStatusCode::TooManyRequests)
+            .with_header("Content-Type", "text/html")
+            .with_header("Retry-After", "60");
+        Ok(response)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::net::IpAddr;
+    use std::sync::Arc;
+    use std::time::Duration;
+
+    fn create_test_config() -> Arc<GurtConfig> {
+        let mut config = crate::config::GurtConfig::default();
+        config.security = Some(crate::config::SecurityConfig {
+            deny_files: vec!["*.secret".to_string(), "private/*".to_string()],
+            allowed_methods: vec!["GET".to_string(), "POST".to_string()],
+            rate_limit_requests: 5,
+            rate_limit_connections: 2,
+        });
+        Arc::new(config)
+    }
+
+    #[test]
+    fn test_rate_limit_data_initialization() {
+        let data = RateLimitData::new();
+        
+        assert_eq!(data.request_count(), 0);
+        assert_eq!(data.connection_count(), 0);
+    }
+
+    #[test]
+    fn test_rate_limit_data_request_tracking() {
+        let mut data = RateLimitData::new();
+        
+        data.add_request();
+        data.add_request();
+        assert_eq!(data.request_count(), 2);
+        
+        data.cleanup_old_requests(Duration::from_secs(0));
+        assert_eq!(data.request_count(), 0);
+    }
+
+    #[test]
+    fn test_rate_limit_data_connection_tracking() {
+        let mut data = RateLimitData::new();
+        
+        data.increment_connections();
+        data.increment_connections();
+        assert_eq!(data.connection_count(), 2);
+        
+        data.decrement_connections();
+        assert_eq!(data.connection_count(), 1);
+        
+        data.decrement_connections();
+        data.decrement_connections();
+        assert_eq!(data.connection_count(), 0);
+    }
+
+    #[test]
+    fn test_security_middleware_initialization() {
+        let config = create_test_config();
+        let middleware = SecurityMiddleware::new(config.clone());
+        
+        assert!(middleware.rate_limit_data.lock().unwrap().is_empty());
+    }
+
+    #[test]
+    fn test_connection_tracking() {
+        let config = create_test_config();
+        let middleware = SecurityMiddleware::new(config.clone());
+        let ip: IpAddr = "127.0.0.1".parse().unwrap();
+        
+        middleware.register_connection(ip);
+        {
+            let data = middleware.rate_limit_data.lock().unwrap();
+            assert_eq!(data.get(&ip).unwrap().connection_count(), 1);
+        }
+        
+        middleware.unregister_connection(ip);
+        {
+            let data = middleware.rate_limit_data.lock().unwrap();
+            assert_eq!(data.get(&ip).unwrap().connection_count(), 0);
+        }
+    }
+
+    #[test]
+    fn test_rate_limiting_requests() {
+        let config = create_test_config();
+        let middleware = SecurityMiddleware::new(config.clone());
+        let ip: IpAddr = "127.0.0.1".parse().unwrap();
+        
+        for _ in 0..5 {
+            assert!(middleware.check_rate_limit(ip));
+        }
+        
+        assert!(!middleware.check_rate_limit(ip));
+    }
+
+    #[test]
+    fn test_connection_limiting() {
+        let config = create_test_config();
+        let middleware = SecurityMiddleware::new(config.clone());
+        let ip: IpAddr = "127.0.0.1".parse().unwrap();
+        
+        middleware.register_connection(ip);
+        middleware.register_connection(ip);
+        
+        assert!(!middleware.check_connection_limit(ip));
+    }
+
+    #[test]
+    fn test_method_validation() {
+        let config = create_test_config();
+        let middleware = SecurityMiddleware::new(config.clone());
+        
+        assert!(middleware.is_method_allowed(&GurtMethod::GET));
+        assert!(middleware.is_method_allowed(&GurtMethod::POST));
+        
+        assert!(!middleware.is_method_allowed(&GurtMethod::PUT));
+        assert!(!middleware.is_method_allowed(&GurtMethod::DELETE));
+    }
+
+    #[test]
+    fn test_multiple_ips_isolation() {
+        let config = create_test_config();
+        let middleware = SecurityMiddleware::new(config.clone());
+        let ip1: IpAddr = "127.0.0.1".parse().unwrap();
+        let ip2: IpAddr = "127.0.0.2".parse().unwrap();
+        
+        for _ in 0..6 {
+            middleware.check_rate_limit(ip1);
+        }
+        
+        assert!(middleware.check_rate_limit(ip2));
+        assert!(!middleware.check_rate_limit(ip1));
+    }
+
+    #[test]
+    fn test_response_creation() {
+        let config = create_test_config();
+        let middleware = SecurityMiddleware::new(config.clone());
+        
+        let response = middleware.create_method_not_allowed_response().unwrap();
+        assert_eq!(response.status_code, 405);
+        
+        let response = middleware.create_rate_limit_response().unwrap();
+        assert_eq!(response.status_code, 429);
+    }
+}

protocol/cli/src/server.rs

@@ -0,0 +1,301 @@
+use crate::{
+    config::GurtConfig, 
+    handlers::{FileHandler, DirectoryHandler, DefaultFileHandler, DefaultDirectoryHandler},
+    request_handler::{RequestHandler, RequestHandlerBuilder},
+};
+use gurt::prelude::*;
+use std::{path::PathBuf, sync::Arc};
+
+pub struct FileServerBuilder {
+    config: GurtConfig,
+    file_handler: Arc<dyn FileHandler>,
+    directory_handler: Arc<dyn DirectoryHandler>,
+}
+
+impl FileServerBuilder {
+    pub fn new(config: GurtConfig) -> Self {
+        Self {
+            config,
+            file_handler: Arc::new(DefaultFileHandler),
+            directory_handler: Arc::new(DefaultDirectoryHandler),
+        }
+    }
+
+    pub fn with_file_handler<H: FileHandler + 'static>(mut self, handler: H) -> Self {
+        self.file_handler = Arc::new(handler);
+        self
+    }
+
+    pub fn with_directory_handler<H: DirectoryHandler + 'static>(mut self, handler: H) -> Self {
+        self.directory_handler = Arc::new(handler);
+        self
+    }
+
+    pub fn build(self) -> crate::Result<GurtServer> {
+        let server = self.create_server()?;
+        let request_handler = self.create_request_handler();
+        let server_with_routes = self.add_routes(server, request_handler);
+        Ok(server_with_routes)
+    }
+
+    fn create_server(&self) -> crate::Result<GurtServer> {
+        match &self.config.tls {
+            Some(tls) => {
+                println!("TLS using certificate: {}", tls.certificate.display());
+                GurtServerBuilder::new()
+                    .with_tls_certificates(&tls.certificate, &tls.private_key)
+                    .with_timeouts(
+                        self.config.get_handshake_timeout(),
+                        self.config.get_request_timeout(),
+                        self.config.get_connection_timeout(),
+                    )
+                    .build()
+            }
+            None => {
+                Err(crate::ServerError::TlsConfiguration(
+                    "GURT protocol requires TLS encryption. Please provide --cert and --key parameters.".to_string()
+                ))
+            }
+        }
+    }
+
+    fn create_request_handler(&self) -> RequestHandler {
+        RequestHandlerBuilder::new(&*self.config.server.base_directory)
+            .with_file_handler(DefaultFileHandler)
+            .with_directory_handler(DefaultDirectoryHandler)
+            .with_config(Arc::new(self.config.clone()))
+            .build()
+    }
+
+    fn add_routes(self, server: GurtServer, request_handler: RequestHandler) -> GurtServer {
+        let request_handler = Arc::new(request_handler);
+
+        let server = server
+            .get("/", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_root_request_with_context(ctx_clone).await
+                    }
+                }
+            })
+            .get("/*", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let path = ctx.path().to_string();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_file_request_with_context(&path, ctx_clone).await
+                    }
+                }
+            });
+
+        let server = server
+            .post("/", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_method_request_with_context(ctx_clone).await
+                    }
+                }
+            })
+            .post("/*", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_method_request_with_context(ctx_clone).await
+                    }
+                }
+            })
+            .put("/", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_method_request_with_context(ctx_clone).await
+                    }
+                }
+            })
+            .put("/*", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_method_request_with_context(ctx_clone).await
+                    }
+                }
+            })
+            .delete("/", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_method_request_with_context(ctx_clone).await
+                    }
+                }
+            })
+            .delete("/*", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_method_request_with_context(ctx_clone).await
+                    }
+                }
+            })
+            .patch("/", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_method_request_with_context(ctx_clone).await
+                    }
+                }
+            })
+            .patch("/*", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_method_request_with_context(ctx_clone).await
+                    }
+                }
+            })
+            .options("/", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_method_request_with_context(ctx_clone).await
+                    }
+                }
+            })
+            .options("/*", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_method_request_with_context(ctx_clone).await
+                    }
+                }
+            })
+            .head("/", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_method_request_with_context(ctx_clone).await
+                    }
+                }
+            })
+            .head("/*", {
+                let handler = request_handler.clone();
+                move |ctx| {
+                    let handler = handler.clone();
+                    let ctx_clone = ctx.clone();
+                    async move {
+                        handler.handle_method_request_with_context(ctx_clone).await
+                    }
+                }
+            });
+
+        server
+    }
+}
+
+
+pub struct GurtServerBuilder {
+    cert_path: Option<PathBuf>,
+    key_path: Option<PathBuf>,
+    host: Option<String>,
+    port: Option<u16>,
+    handshake_timeout: Option<std::time::Duration>,
+    request_timeout: Option<std::time::Duration>,
+    connection_timeout: Option<std::time::Duration>,
+}
+
+impl GurtServerBuilder {
+    pub fn new() -> Self {
+        Self {
+            cert_path: None,
+            key_path: None,
+            host: None,
+            port: None,
+            handshake_timeout: None,
+            request_timeout: None,
+            connection_timeout: None,
+        }
+    }
+
+    pub fn with_tls_certificates<P: Into<PathBuf>>(mut self, cert_path: P, key_path: P) -> Self {
+        self.cert_path = Some(cert_path.into());
+        self.key_path = Some(key_path.into());
+        self
+    }
+
+    pub fn with_host<S: Into<String>>(mut self, host: S) -> Self {
+        self.host = Some(host.into());
+        self
+    }
+
+    pub fn with_port(mut self, port: u16) -> Self {
+        self.port = Some(port);
+        self
+    }
+
+    pub fn with_timeouts(mut self, handshake_timeout: std::time::Duration, request_timeout: std::time::Duration, connection_timeout: std::time::Duration) -> Self {
+        self.handshake_timeout = Some(handshake_timeout);
+        self.request_timeout = Some(request_timeout);
+        self.connection_timeout = Some(connection_timeout);
+        self
+    }
+
+    pub fn build(self) -> crate::Result<GurtServer> {
+        match (self.cert_path, self.key_path) {
+            (Some(cert), Some(key)) => {
+                let mut server = GurtServer::with_tls_certificates(
+                    cert.to_str().ok_or_else(|| {
+                        crate::ServerError::TlsConfiguration("Invalid certificate path".to_string())
+                    })?,
+                    key.to_str().ok_or_else(|| {
+                        crate::ServerError::TlsConfiguration("Invalid key path".to_string())
+                    })?
+                ).map_err(crate::ServerError::from)?;
+                
+                if let (Some(handshake), Some(request), Some(connection)) = 
+                    (self.handshake_timeout, self.request_timeout, self.connection_timeout) {
+                    server = server.with_timeouts(handshake, request, connection);
+                }
+                
+                Ok(server)
+            }
+            _ => {
+                Err(crate::ServerError::TlsConfiguration(
+                    "TLS certificates are required. Use with_tls_certificates() to provide them.".to_string()
+                ))
+            }
+        }
+    }
+}
+
+impl Default for GurtServerBuilder {
+    fn default() -> Self {
+        Self::new()
+    }
+}

protocol/cli/templates/404.html

@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>404 Not Found</title>
+    <style>
+        body { 
+            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+            margin: 40px;
+            text-align: center;
+            background: #f5f5f5;
+        }
+        .container {
+            background: white;
+            padding: 60px 40px;
+            border-radius: 8px;
+            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
+            display: inline-block;
+        }
+        h1 { color: #d32f2f; }
+        a { color: #0066cc; text-decoration: none; }
+        a:hover { text-decoration: underline; }
+    </style>
+</head>
+<body>
+    <div class="container">
+        <h1>404 Page Not Found</h1>
+        <p>The requested path was not found on this GURT server.</p>
+        <p><a href="/">Back to home</a></p>
+    </div>
+</body>
+</html>

protocol/cli/templates/directory_content_start.html

@@ -0,0 +1 @@
+        <div>

protocol/cli/templates/directory_listing_end.html

@@ -0,0 +1,4 @@
+    </div>
+</div>
+</body>
+</html>

protocol/cli/templates/directory_listing_start.html

@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Directory Listing</title>
+    <style>
+        body { 
+            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+            margin: 40px;
+            background: #f5f5f5;
+        }
+        .container {
+            background: white;
+            padding: 30px;
+            border-radius: 8px;
+            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
+        }
+        .dir { 
+            font-weight: bold; 
+            color: #0066cc; 
+        }
+        .file {
+            color: #333;
+        }
+        a {
+            text-decoration: none;
+            display: block;
+            padding: 8px 12px;
+            margin: 2px 0;
+            border-radius: 4px;
+            transition: background-color 0.2s;
+        }
+        a:hover {
+            background-color: #f0f0f0;
+        }
+        .parent {
+            color: #666;
+            font-style: italic;
+        }
+    </style>
+</head>
+<body>
+    <div class="container">
+        <h1>Directory Listing</h1>

protocol/cli/templates/directory_parent_link.html

@@ -0,0 +1 @@
+        <a href="../" class="parent">← Parent Directory</a>

protocol/cli/templates/error.html

@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <title>{} {}</title>
+    <style>
+        body {{
+            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+            margin: 40px;
+            text-align: center;
+            background: #f5f5f5;
+        }}
+        .container {{
+            background: white;
+            padding: 60px 40px;
+            border-radius: 8px;
+            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
+            display: inline-block;
+            max-width: 500px;
+        }}
+        h1 {{ color: #d32f2f; margin-bottom: 20px; }}
+        p {{ color: #555; margin-bottom: 30px; }}
+        a {{ color: #0066cc; text-decoration: none; }}
+        a:hover {{ text-decoration: underline; }}
+    </style>
+</head>
+<body>
+    <div class="container">
+        <h1>{} {}</h1>
+        <p>{}</p>
+        <p><a href="/">Back to home</a></p>
+    </div>
+</body>
+</html>