Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

pkg/mediameta/extractor.go

@@ -0,0 +1,106 @@
+package mediameta
+
+import (
+	"context"
+	"encoding/gob"
+	"errors"
+	"github.com/cloudreve/Cloudreve/v4/pkg/filemanager/driver"
+	"github.com/cloudreve/Cloudreve/v4/pkg/filemanager/manager/entitysource"
+	"github.com/cloudreve/Cloudreve/v4/pkg/logging"
+	"github.com/cloudreve/Cloudreve/v4/pkg/setting"
+	"github.com/samber/lo"
+	"io"
+)
+
+type (
+	Extractor interface {
+		// Exts returns the supported file extensions.
+		Exts() []string
+		// Extract extracts the media meta from the given source.
+		Extract(ctx context.Context, ext string, source entitysource.EntitySource) ([]driver.MediaMeta, error)
+	}
+)
+
+var (
+	ErrFileTooLarge = errors.New("file too large")
+)
+
+func init() {
+	gob.Register([]driver.MediaMeta{})
+}
+
+func NewExtractorManager(ctx context.Context, settings setting.Provider, l logging.Logger) Extractor {
+	e := &extractorManager{
+		settings: settings,
+		extMap:   make(map[string][]Extractor),
+	}
+
+	extractors := []Extractor{}
+
+	if e.settings.MediaMetaExifEnabled(ctx) {
+		exifE := newExifExtractor(settings, l)
+		extractors = append(extractors, exifE)
+	}
+
+	if e.settings.MediaMetaMusicEnabled(ctx) {
+		musicE := newMusicExtractor(settings, l)
+		extractors = append(extractors, musicE)
+	}
+
+	if e.settings.MediaMetaFFProbeEnabled(ctx) {
+		ffprobeE := newFFProbeExtractor(settings, l)
+		extractors = append(extractors, ffprobeE)
+	}
+
+	for _, extractor := range extractors {
+		for _, ext := range extractor.Exts() {
+			if e.extMap[ext] == nil {
+				e.extMap[ext] = []Extractor{}
+			}
+			e.extMap[ext] = append(e.extMap[ext], extractor)
+		}
+	}
+
+	return e
+}
+
+type extractorManager struct {
+	settings setting.Provider
+	extMap   map[string][]Extractor
+}
+
+func (e *extractorManager) Exts() []string {
+	return lo.Keys(e.extMap)
+}
+
+func (e *extractorManager) Extract(ctx context.Context, ext string, source entitysource.EntitySource) ([]driver.MediaMeta, error) {
+	if extractor, ok := e.extMap[ext]; ok {
+		res := []driver.MediaMeta{}
+		for _, e := range extractor {
+			_, _ = source.Seek(0, io.SeekStart)
+			data, err := e.Extract(ctx, ext, source)
+			if err != nil {
+				return nil, err
+			}
+
+			res = append(res, data...)
+		}
+
+		return res, nil
+	} else {
+		return nil, nil
+	}
+}
+
+// checkFileSize checks if the file size exceeds the limit.
+func checkFileSize(localLimit, remoteLimit int64, source entitysource.EntitySource) error {
+	if source.IsLocal() && localLimit > 0 && source.Entity().Size() > localLimit {
+		return ErrFileTooLarge
+	}
+
+	if !source.IsLocal() && remoteLimit > 0 && source.Entity().Size() > remoteLimit {
+		return ErrFileTooLarge
+	}
+
+	return nil
+}