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134 lines
3.6 KiB
134 lines
3.6 KiB
package remote
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// TODO 测试
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import (
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"context"
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"encoding/base64"
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"errors"
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"fmt"
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model "github.com/HFO4/cloudreve/models"
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"github.com/HFO4/cloudreve/pkg/auth"
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"github.com/HFO4/cloudreve/pkg/filesystem/fsctx"
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"github.com/HFO4/cloudreve/pkg/filesystem/response"
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"github.com/HFO4/cloudreve/pkg/serializer"
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"io"
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"net/http"
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"net/url"
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"time"
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)
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// Handler 远程存储策略适配器
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type Handler struct {
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Policy *model.Policy
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}
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// Get 获取文件内容
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func (handler Handler) Get(ctx context.Context, path string) (response.RSCloser, error) {
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return nil, nil
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}
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// Put 将文件流保存到指定目录
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func (handler Handler) Put(ctx context.Context, file io.ReadCloser, dst string, size uint64) error {
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return errors.New("远程策略不支持此上传方式")
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}
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// Delete 删除一个或多个文件，
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// 返回未删除的文件，及遇到的最后一个错误
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func (handler Handler) Delete(ctx context.Context, files []string) ([]string, error) {
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return []string{}, nil
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}
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// Thumb 获取文件缩略图
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func (handler Handler) Thumb(ctx context.Context, path string) (*response.ContentResponse, error) {
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return nil, errors.New("未实现")
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}
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// Source 获取外链URL
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// TODO 测试
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func (handler Handler) Source(
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ctx context.Context,
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path string,
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baseURL url.URL,
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ttl int64,
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isDownload bool,
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) (string, error) {
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file, ok := ctx.Value(fsctx.FileModelCtx).(model.File)
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if !ok {
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return "", errors.New("无法获取文件记录上下文")
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}
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serverURL, err := url.Parse(handler.Policy.Server)
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if err != nil {
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return "", errors.New("无法解析远程服务端地址")
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}
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var (
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expires int64
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signedURI *url.URL
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controller = "/api/v3/slave/download"
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)
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if !isDownload {
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controller = "/api/v3/slave/source"
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}
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if ttl > 0 {
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expires = time.Now().Unix() + ttl
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}
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// 签名下载地址
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sourcePath := base64.RawURLEncoding.EncodeToString([]byte(file.SourceName))
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authInstance := auth.HMACAuth{SecretKey: []byte(handler.Policy.SecretKey)}
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signedURI, err = auth.SignURI(
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authInstance,
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fmt.Sprintf("%s/%s", controller, sourcePath),
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expires,
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)
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if err != nil {
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return "", serializer.NewError(serializer.CodeEncryptError, "无法对URL进行签名", err)
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}
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finalURL := serverURL.ResolveReference(signedURI).String()
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return finalURL, nil
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}
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// Token 获取上传策略和认证Token
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func (handler Handler) Token(ctx context.Context, TTL int64, key string) (serializer.UploadCredential, error) {
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// 生成回调地址
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siteURL := model.GetSiteURL()
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apiBaseURI, _ := url.Parse("/api/v3/callback/remote/" + key)
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apiURL := siteURL.ResolveReference(apiBaseURI)
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// 生成上传策略
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policy := serializer.UploadPolicy{
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SavePath: handler.Policy.DirNameRule,
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FileName: handler.Policy.FileNameRule,
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AutoRename: handler.Policy.AutoRename,
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MaxSize: handler.Policy.MaxSize,
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AllowedExtension: handler.Policy.OptionsSerialized.FileType,
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CallbackURL: apiURL.String(),
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}
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policyEncoded, err := policy.EncodeUploadPolicy()
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if err != nil {
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return serializer.UploadCredential{}, err
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}
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// 签名上传策略
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uploadRequest, _ := http.NewRequest("POST", "/api/v3/slave/upload", nil)
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uploadRequest.Header = map[string][]string{
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"X-Policy": {policyEncoded},
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}
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remoteAuth := auth.HMACAuth{SecretKey: []byte(handler.Policy.SecretKey)}
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auth.SignRequest(remoteAuth, uploadRequest, time.Now().Unix()+TTL)
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if credential, ok := uploadRequest.Header["Authorization"]; ok && len(credential) == 1 {
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return serializer.UploadCredential{
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Token: credential[0],
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Policy: policyEncoded,
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}, nil
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}
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return serializer.UploadCredential{}, errors.New("无法签名上传策略")
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}
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