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cloudreve/pkg/filesystem/driver/remote/handler.go

280 lines
7.1 KiB

package remote
import (
"context"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
model "github.com/HFO4/cloudreve/models"
"github.com/HFO4/cloudreve/pkg/auth"
"github.com/HFO4/cloudreve/pkg/filesystem/fsctx"
"github.com/HFO4/cloudreve/pkg/filesystem/response"
"github.com/HFO4/cloudreve/pkg/request"
"github.com/HFO4/cloudreve/pkg/serializer"
"io"
"net/http"
"net/url"
"path"
"strings"
)
// Driver 远程存储策略适配器
type Driver struct {
Client request.Client
Policy *model.Policy
AuthInstance auth.Auth
}
// getAPIUrl 获取接口请求地址
func (handler Driver) getAPIUrl(scope string, routes ...string) string {
serverURL, err := url.Parse(handler.Policy.Server)
if err != nil {
return ""
}
var controller *url.URL
switch scope {
case "delete":
controller, _ = url.Parse("/api/v3/slave/delete")
case "thumb":
controller, _ = url.Parse("/api/v3/slave/thumb")
default:
controller = serverURL
}
for _, r := range routes {
controller.Path = path.Join(controller.Path, r)
}
return serverURL.ResolveReference(controller).String()
}
// Get 获取文件内容
func (handler Driver) Get(ctx context.Context, path string) (response.RSCloser, error) {
// 尝试获取速度限制 TODO 是否需要在这里限制?
speedLimit := 0
if user, ok := ctx.Value(fsctx.UserCtx).(model.User); ok {
speedLimit = user.Group.SpeedLimit
}
// 获取文件源地址
downloadURL, err := handler.Source(ctx, path, url.URL{}, 0, true, speedLimit)
if err != nil {
return nil, err
}
// 获取文件数据流
resp, err := handler.Client.Request(
"GET",
downloadURL,
nil,
request.WithContext(ctx),
).CheckHTTPResponse(200).GetRSCloser()
if err != nil {
return nil, err
}
resp.SetFirstFakeChunk()
// 尝试获取文件大小
if file, ok := ctx.Value(fsctx.FileModelCtx).(model.File); ok {
resp.SetContentLength(int64(file.Size))
}
return resp, nil
}
// Put 将文件流保存到指定目录
func (handler Driver) Put(ctx context.Context, file io.ReadCloser, dst string, size uint64) error {
defer file.Close()
// 凭证有效期
credentialTTL := model.GetIntSetting("upload_credential_timeout", 3600)
// 生成上传策略
policy := serializer.UploadPolicy{
SavePath: path.Dir(dst),
FileName: path.Base(dst),
AutoRename: false,
MaxSize: size,
}
credential, err := handler.getUploadCredential(ctx, policy, int64(credentialTTL))
if err != nil {
return err
}
// 对文件名进行URLEncode
fileName, err := url.QueryUnescape(path.Base(dst))
if err != nil {
return err
}
// 上传文件
resp, err := handler.Client.Request(
"POST",
handler.Policy.GetUploadURL(),
file,
request.WithHeader(map[string][]string{
"Authorization": {credential.Token},
"X-Policy": {credential.Policy},
"X-FileName": {fileName},
}),
request.WithContentLength(int64(size)),
).CheckHTTPResponse(200).DecodeResponse()
if err != nil {
return err
}
if resp.Code != 0 {
return errors.New(resp.Msg)
}
return nil
}
// Delete 删除一个或多个文件,
// 返回未删除的文件,及遇到的最后一个错误
func (handler Driver) Delete(ctx context.Context, files []string) ([]string, error) {
// 封装接口请求正文
reqBody := serializer.RemoteDeleteRequest{
Files: files,
}
reqBodyEncoded, err := json.Marshal(reqBody)
if err != nil {
return files, err
}
// 发送删除请求
bodyReader := strings.NewReader(string(reqBodyEncoded))
signTTL := model.GetIntSetting("slave_api_timeout", 60)
resp, err := handler.Client.Request(
"POST",
handler.getAPIUrl("delete"),
bodyReader,
request.WithCredential(handler.AuthInstance, int64(signTTL)),
).CheckHTTPResponse(200).GetResponse()
if err != nil {
return files, err
}
// 处理删除结果
var reqResp serializer.Response
err = json.Unmarshal([]byte(resp), &reqResp)
if err != nil {
return files, err
}
if reqResp.Code != 0 {
var failedResp serializer.RemoteDeleteRequest
if failed, ok := reqResp.Data.(string); ok {
err = json.Unmarshal([]byte(failed), &failedResp)
if err == nil {
return failedResp.Files, errors.New(reqResp.Error)
}
}
return files, errors.New("未知的返回结果格式")
}
return []string{}, nil
}
// Thumb 获取文件缩略图
func (handler Driver) Thumb(ctx context.Context, path string) (*response.ContentResponse, error) {
sourcePath := base64.RawURLEncoding.EncodeToString([]byte(path))
thumbURL := handler.getAPIUrl("thumb") + "/" + sourcePath
ttl := model.GetIntSetting("preview_timeout", 60)
signedThumbURL, err := auth.SignURI(handler.AuthInstance, thumbURL, int64(ttl))
if err != nil {
return nil, err
}
return &response.ContentResponse{
Redirect: true,
URL: signedThumbURL.String(),
}, nil
}
// Source 获取外链URL
func (handler Driver) Source(
ctx context.Context,
path string,
baseURL url.URL,
ttl int64,
isDownload bool,
speed int,
) (string, error) {
// 尝试从上下文获取文件名
fileName := "file"
if file, ok := ctx.Value(fsctx.FileModelCtx).(model.File); ok {
fileName = file.Name
}
serverURL, err := url.Parse(handler.Policy.Server)
if err != nil {
return "", errors.New("无法解析远程服务端地址")
}
var (
signedURI *url.URL
controller = "/api/v3/slave/download"
)
if !isDownload {
controller = "/api/v3/slave/source"
}
// 签名下载地址
sourcePath := base64.RawURLEncoding.EncodeToString([]byte(path))
signedURI, err = auth.SignURI(
handler.AuthInstance,
fmt.Sprintf("%s/%d/%s/%s", controller, speed, sourcePath, fileName),
ttl,
)
if err != nil {
return "", serializer.NewError(serializer.CodeEncryptError, "无法对URL进行签名", err)
}
finalURL := serverURL.ResolveReference(signedURI).String()
return finalURL, nil
}
// Token 获取上传策略和认证Token
func (handler Driver) Token(ctx context.Context, TTL int64, key string) (serializer.UploadCredential, error) {
// 生成回调地址
siteURL := model.GetSiteURL()
apiBaseURI, _ := url.Parse("/api/v3/callback/remote/" + key)
apiURL := siteURL.ResolveReference(apiBaseURI)
// 生成上传策略
policy := serializer.UploadPolicy{
SavePath: handler.Policy.DirNameRule,
FileName: handler.Policy.FileNameRule,
AutoRename: handler.Policy.AutoRename,
MaxSize: handler.Policy.MaxSize,
AllowedExtension: handler.Policy.OptionsSerialized.FileType,
CallbackURL: apiURL.String(),
}
return handler.getUploadCredential(ctx, policy, TTL)
}
func (handler Driver) getUploadCredential(ctx context.Context, policy serializer.UploadPolicy, TTL int64) (serializer.UploadCredential, error) {
policyEncoded, err := policy.EncodeUploadPolicy()
if err != nil {
return serializer.UploadCredential{}, err
}
// 签名上传策略
uploadRequest, _ := http.NewRequest("POST", "/api/v3/slave/upload", nil)
uploadRequest.Header = map[string][]string{
"X-Policy": {policyEncoded},
}
auth.SignRequest(handler.AuthInstance, uploadRequest, TTL)
if credential, ok := uploadRequest.Header["Authorization"]; ok && len(credential) == 1 {
return serializer.UploadCredential{
Token: credential[0],
Policy: policyEncoded,
}, nil
}
return serializer.UploadCredential{}, errors.New("无法签名上传策略")
}