feat(source link): create perm source link with shorter url

models/source_link.go

@@ -0,0 +1,41 @@
+package model
+
+import (
+	"fmt"
+	"github.com/cloudreve/Cloudreve/v3/pkg/hashid"
+	"github.com/jinzhu/gorm"
+	"net/url"
+)
+
+// SourceLink represent a shared file source link
+type SourceLink struct {
+	gorm.Model
+	FileID    uint   // corresponding file ID
+	Name      string // name of the file while creating the source link, for annotation
+	Downloads int    // 下载数
+
+	// 关联模型
+	File File `gorm:"save_associations:false:false"`
+}
+
+// Link gets the URL of a SourceLink
+func (s *SourceLink) Link() (string, error) {
+	baseURL := GetSiteURL()
+	linkPath, err := url.Parse(fmt.Sprintf("/f/%s/%s", hashid.HashID(s.ID, hashid.SourceLinkID), s.File.Name))
+	if err != nil {
+		return "", err
+	}
+	return baseURL.ResolveReference(linkPath).String(), nil
+}
+
+// GetTasksByID queries source link based on ID
+func GetSourceLinkByID(id interface{}) (*SourceLink, error) {
+	link := &SourceLink{}
+	result := DB.Where("id = ?", id).First(link)
+	files, _ := GetFilesByIDs([]uint{link.FileID}, 0)
+	if len(files) > 0 {
+		link.File = files[0]
+	}
+
+	return link, result.Error
+}