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handler.go 7.79 KB
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HCY 提交于 2024-05-10 13:07 . edit pkg
package remote
import (
"context"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"net/url"
"path"
"strings"
"time"
"gitee.com/wuzheng0709/backend-gopkg/infrastructure/pkg/auth"
"gitee.com/wuzheng0709/backend-gopkg/infrastructure/pkg/filesystem/fsctx"
"gitee.com/wuzheng0709/backend-gopkg/infrastructure/pkg/filesystem/response"
model "gitee.com/wuzheng0709/backend-gopkg/infrastructure/pkg/models"
"gitee.com/wuzheng0709/backend-gopkg/infrastructure/pkg/request"
"gitee.com/wuzheng0709/backend-gopkg/infrastructure/pkg/serializer"
)
// Driver 远程存储策略适配器
type Driver struct {
Client request.Client
Policy *model.Policy
AuthInstance auth.Auth
uploadClient Client
}
// NewDriver initializes a new Driver from policy
// TODO: refactor all method into upload client
func NewDriver(policy *model.Policy) (*Driver, error) {
client, err := NewClient(policy)
if err != nil {
return nil, err
}
return &Driver{
Policy: policy,
Client: request.NewClient(),
AuthInstance: auth.HMACAuth{[]byte(policy.SecretKey)},
uploadClient: client,
}, nil
}
// List 列取文件
func (handler *Driver) List(ctx context.Context, path string, recursive bool) ([]response.Object, error) {
var res []response.Object
reqBody := serializer.ListRequest{
Path: path,
Recursive: recursive,
}
reqBodyEncoded, err := json.Marshal(reqBody)
if err != nil {
return res, err
}
// 发送列表请求
bodyReader := strings.NewReader(string(reqBodyEncoded))
signTTL := model.GetIntSetting("slave_api_timeout", 60)
resp, err := handler.Client.Request(
"POST",
handler.getAPIUrl("list"),
bodyReader,
request.WithCredential(handler.AuthInstance, int64(signTTL)),
request.WithMasterMeta(),
).CheckHTTPResponse(200).DecodeResponse()
if err != nil {
return res, err
}
// 处理列取结果
if resp.Code != 0 {
return res, errors.New(resp.Error)
}
if resStr, ok := resp.Data.(string); ok {
err = json.Unmarshal([]byte(resStr), &res)
if err != nil {
return res, err
}
}
return res, nil
}
// 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")
case "list":
controller, _ = url.Parse("/api/v3/slave/list")
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
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),
request.WithTimeout(time.Duration(0)),
request.WithMasterMeta(),
).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 fsctx.FileHeader) error {
defer file.Close()
return handler.uploadClient.Upload(ctx, file)
}
// 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)),
request.WithMasterMeta(),
request.WithSlaveMeta(handler.Policy.AccessKey),
).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")
}
// 是否启用了CDN
if handler.Policy.BaseURL != "" {
cdnURL, err := url.Parse(handler.Policy.BaseURL)
if err != nil {
return "", err
}
serverURL = cdnURL
}
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, url.PathEscape(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, uploadSession *serializer.UploadSession, file fsctx.FileHeader) (*serializer.UploadCredential, error) {
siteURL := model.GetSiteURL()
apiBaseURI, _ := url.Parse(path.Join("/api/v3/callback/remote", uploadSession.Key, uploadSession.CallbackSecret))
apiURL := siteURL.ResolveReference(apiBaseURI)
// 在从机端创建上传会话
uploadSession.Callback = apiURL.String()
if err := handler.uploadClient.CreateUploadSession(ctx, uploadSession, ttl, false); err != nil {
return nil, err
}
// 获取上传地址
uploadURL, sign, err := handler.uploadClient.GetUploadURL(ttl, uploadSession.Key)
if err != nil {
return nil, fmt.Errorf("failed to sign upload url: %w", err)
}
return &serializer.UploadCredential{
SessionID: uploadSession.Key,
ChunkSize: handler.Policy.OptionsSerialized.ChunkSize,
UploadURLs: []string{uploadURL},
Credential: sign,
}, nil
}
// 取消上传凭证
func (handler *Driver) CancelToken(ctx context.Context, uploadSession *serializer.UploadSession) error {
return handler.uploadClient.DeleteUploadSession(ctx, uploadSession.Key)
}
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wuzheng0709
backend-gopkg
backend-gopkg
v1.6.6

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