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272 lines
7.0 KiB
272 lines
7.0 KiB
package remote
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import (
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"context"
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"encoding/base64"
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"encoding/json"
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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/request"
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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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"path"
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"strings"
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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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Client request.Client
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Policy *model.Policy
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AuthInstance auth.Auth
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}
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// getAPIUrl 获取接口请求地址
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func (handler Handler) getAPIUrl(scope string, routes ...string) string {
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serverURL, err := url.Parse(handler.Policy.Server)
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if err != nil {
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return ""
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}
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var controller *url.URL
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switch scope {
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case "upload":
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controller, _ = url.Parse("/api/v3/slave/upload")
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case "delete":
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controller, _ = url.Parse("/api/v3/slave/delete")
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case "thumb":
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controller, _ = url.Parse("/api/v3/slave/thumb")
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default:
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controller = serverURL
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}
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for _, r := range routes {
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controller.Path = path.Join(controller.Path, r)
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}
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return serverURL.ResolveReference(controller).String()
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}
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// Get 获取文件内容
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// TODO 测试
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func (handler Handler) Get(ctx context.Context, path string) (response.RSCloser, error) {
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// 尝试获取速度限制 TODO 是否需要在这里限制？
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speedLimit := 0
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if user, ok := ctx.Value(fsctx.UserCtx).(model.User); ok {
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speedLimit = user.Group.SpeedLimit
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}
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// 获取文件源地址
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downloadURL, err := handler.Source(ctx, path, url.URL{}, 0, true, speedLimit)
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if err != nil {
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return nil, err
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}
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// 获取文件数据流
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resp, err := handler.Client.Request(
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"GET",
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downloadURL,
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nil,
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request.WithContext(ctx),
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).CheckHTTPResponse(200).GetRSCloser()
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if err != nil {
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return nil, err
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}
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resp.SetFirstFakeChunk()
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return resp, 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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defer file.Close()
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// 凭证有效期
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credentialTTL := model.GetIntSetting("upload_credential_timeout", 3600)
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// 生成上传策略
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policy := serializer.UploadPolicy{
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SavePath: path.Dir(dst),
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FileName: path.Base(dst),
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AutoRename: false,
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MaxSize: size,
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}
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credential, err := handler.getUploadCredential(ctx, policy, int64(credentialTTL))
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if err != nil {
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return err
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}
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// 上传文件
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resp, err := handler.Client.Request(
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"POST",
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handler.getAPIUrl("upload"),
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file,
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request.WithHeader(map[string][]string{
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"Authorization": {credential.Token},
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"X-Policy": {credential.Policy},
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"X-FileName": {path.Base(dst)},
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}),
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request.WithContentLength(int64(size)),
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).CheckHTTPResponse(200).DecodeResponse()
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if err != nil {
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return err
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}
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if resp.Code != 0 {
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return errors.New(resp.Msg)
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}
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return nil
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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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// 封装接口请求正文
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reqBody := serializer.RemoteDeleteRequest{
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Files: files,
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}
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reqBodyEncoded, err := json.Marshal(reqBody)
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if err != nil {
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return files, err
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}
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// 发送删除请求
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bodyReader := strings.NewReader(string(reqBodyEncoded))
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signTTL := model.GetIntSetting("slave_api_timeout", 60)
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resp, err := handler.Client.Request(
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"POST",
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handler.getAPIUrl("delete"),
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bodyReader,
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request.WithCredential(handler.AuthInstance, int64(signTTL)),
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).CheckHTTPResponse(200).GetResponse()
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if err != nil {
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return files, err
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}
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// 处理删除结果
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var reqResp serializer.Response
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err = json.Unmarshal([]byte(resp), &reqResp)
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if err != nil {
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return files, err
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}
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if reqResp.Code != 0 {
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var failedResp serializer.RemoteDeleteRequest
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if failed, ok := reqResp.Data.(string); ok {
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err = json.Unmarshal([]byte(failed), &failedResp)
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if err == nil {
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return failedResp.Files, errors.New(reqResp.Error)
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}
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}
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return files, errors.New("未知的返回结果格式")
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}
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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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sourcePath := base64.RawURLEncoding.EncodeToString([]byte(path))
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thumbURL := handler.getAPIUrl("thumb") + "/" + sourcePath
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ttl := model.GetIntSetting("slave_api_timeout", 60)
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signedThumbURL, err := auth.SignURI(handler.AuthInstance, thumbURL, int64(ttl))
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if err != nil {
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return nil, err
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}
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return &response.ContentResponse{
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Redirect: true,
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URL: signedThumbURL.String(),
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}, nil
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}
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// Source 获取外链URL
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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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speed int,
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) (string, error) {
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// 尝试从上下文获取文件名
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fileName := "file"
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if file, ok := ctx.Value(fsctx.FileModelCtx).(model.File); ok {
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fileName = file.Name
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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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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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// 签名下载地址
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sourcePath := base64.RawURLEncoding.EncodeToString([]byte(path))
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signedURI, err = auth.SignURI(
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handler.AuthInstance,
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fmt.Sprintf("%s/%d/%s/%s", controller, speed, sourcePath, fileName),
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ttl,
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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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return handler.getUploadCredential(ctx, policy, TTL)
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}
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func (handler Handler) getUploadCredential(ctx context.Context, policy serializer.UploadPolicy, TTL int64) (serializer.UploadCredential, error) {
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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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auth.SignRequest(handler.AuthInstance, uploadRequest, 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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