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package cos
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import (
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"context"
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"crypto/hmac"
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"crypto/sha1"
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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/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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"github.com/google/go-querystring/query"
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cossdk "github.com/tencentyun/cos-go-sdk-v5"
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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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// UploadPolicy 腾讯云COS上传策略
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type UploadPolicy struct {
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Expiration string `json:"expiration"`
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Conditions []interface{} `json:"conditions"`
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}
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// MetaData 文件元信息
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type MetaData struct {
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Size uint64
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CallbackKey string
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CallbackURL string
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}
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type urlOption struct {
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Speed int `url:"x-cos-traffic-limit,omitempty"`
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ContentDescription string `url:"response-content-disposition,omitempty"`
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}
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// Driver 腾讯云COS适配器模板
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type Driver struct {
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Policy *model.Policy
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Client *cossdk.Client
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HTTPClient request.Client
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}
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func (handler Driver) List(ctx context.Context, path string, recursive bool) ([]response.Object, error) {
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panic("implement me")
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}
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// CORS 创建跨域策略
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func (handler Driver) CORS() error {
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_, err := handler.Client.Bucket.PutCORS(context.Background(), &cossdk.BucketPutCORSOptions{
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Rules: []cossdk.BucketCORSRule{{
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AllowedMethods: []string{
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"GET",
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"POST",
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"PUT",
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"DELETE",
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"HEAD",
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},
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AllowedOrigins: []string{"*"},
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AllowedHeaders: []string{"*"},
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MaxAgeSeconds: 3600,
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ExposeHeaders: []string{},
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}},
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})
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return err
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}
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// Get 获取文件
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func (handler Driver) Get(ctx context.Context, path string) (response.RSCloser, error) {
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// 获取文件源地址
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downloadURL, err := handler.Source(
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ctx,
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path,
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url.URL{},
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int64(model.GetIntSetting("preview_timeout", 60)),
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false,
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0,
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)
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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.HTTPClient.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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request.WithTimeout(time.Duration(0)),
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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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// 尝试自主获取文件大小
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if file, ok := ctx.Value(fsctx.FileModelCtx).(model.File); ok {
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resp.SetContentLength(int64(file.Size))
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}
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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 Driver) Put(ctx context.Context, file io.ReadCloser, dst string, size uint64) error {
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opt := &cossdk.ObjectPutOptions{}
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_, err := handler.Client.Object.Put(ctx, dst, file, opt)
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return err
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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 Driver) Delete(ctx context.Context, files []string) ([]string, error) {
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obs := []cossdk.Object{}
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for _, v := range files {
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obs = append(obs, cossdk.Object{Key: v})
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}
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opt := &cossdk.ObjectDeleteMultiOptions{
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Objects: obs,
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Quiet: true,
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}
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res, _, err := handler.Client.Object.DeleteMulti(context.Background(), opt)
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if err != nil {
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return files, err
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}
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// 整理删除结果
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failed := make([]string, 0, len(files))
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for _, v := range res.Errors {
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failed = append(failed, v.Key)
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}
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if len(failed) == 0 {
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return failed, nil
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}
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return failed, errors.New("删除失败")
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}
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// Thumb 获取文件缩略图
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func (handler Driver) Thumb(ctx context.Context, path string) (*response.ContentResponse, error) {
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var (
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thumbSize = [2]uint{400, 300}
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ok = false
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)
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if thumbSize, ok = ctx.Value(fsctx.ThumbSizeCtx).([2]uint); !ok {
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return nil, errors.New("无法获取缩略图尺寸设置")
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}
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thumbParam := fmt.Sprintf("imageMogr2/thumbnail/%dx%d", thumbSize[0], thumbSize[1])
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source, err := handler.signSourceURL(
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ctx,
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path,
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int64(model.GetIntSetting("preview_timeout", 60)),
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&urlOption{},
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)
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if err != nil {
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return nil, err
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}
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thumbURL, _ := url.Parse(source)
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thumbQuery := thumbURL.Query()
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thumbQuery.Add(thumbParam, "")
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thumbURL.RawQuery = thumbQuery.Encode()
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return &response.ContentResponse{
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Redirect: true,
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URL: thumbURL.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 Driver) 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 := ""
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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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// 添加各项设置
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options := urlOption{}
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if speed > 0 {
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if speed < 819200 {
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speed = 819200
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}
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if speed > 838860800 {
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speed = 838860800
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}
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options.Speed = speed
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}
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if isDownload {
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options.ContentDescription = "attachment; filename=\"" + url.PathEscape(fileName) + "\""
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}
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return handler.signSourceURL(ctx, path, ttl, &options)
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}
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func (handler Driver) signSourceURL(ctx context.Context, path string, ttl int64, options *urlOption) (string, error) {
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cdnURL, err := url.Parse(handler.Policy.BaseURL)
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if err != nil {
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return "", err
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}
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// 公有空间不需要签名
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if !handler.Policy.IsPrivate {
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file, err := url.Parse(path)
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if err != nil {
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return "", err
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}
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// 非签名URL不支持设置响应header
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options.ContentDescription = ""
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optionQuery, err := query.Values(*options)
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if err != nil {
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return "", err
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}
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file.RawQuery = optionQuery.Encode()
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sourceURL := cdnURL.ResolveReference(file)
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return sourceURL.String(), nil
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}
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presignedURL, err := handler.Client.Object.GetPresignedURL(ctx, http.MethodGet, path,
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handler.Policy.AccessKey, handler.Policy.SecretKey, time.Duration(ttl)*time.Second, options)
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if err != nil {
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return "", err
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}
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// 将最终生成的签名URL域名换成用户自定义的加速域名（如果有）
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presignedURL.Host = cdnURL.Host
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presignedURL.Scheme = cdnURL.Scheme
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return presignedURL.String(), 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 Driver) Token(ctx context.Context, TTL int64, key string) (serializer.UploadCredential, error) {
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// 读取上下文中生成的存储路径
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savePath, ok := ctx.Value(fsctx.SavePathCtx).(string)
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if !ok {
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return serializer.UploadCredential{}, errors.New("无法获取存储路径")
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}
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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/cos/" + key)
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apiURL := siteURL.ResolveReference(apiBaseURI).String()
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// 上传策略
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startTime := time.Now()
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endTime := startTime.Add(time.Duration(TTL) * time.Second)
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keyTime := fmt.Sprintf("%d;%d", startTime.Unix(), endTime.Unix())
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postPolicy := UploadPolicy{
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Expiration: endTime.UTC().Format(time.RFC3339),
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Conditions: []interface{}{
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map[string]string{"bucket": handler.Policy.BucketName},
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map[string]string{"$key": savePath},
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map[string]string{"x-cos-meta-callback": apiURL},
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map[string]string{"x-cos-meta-key": key},
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map[string]string{"q-sign-algorithm": "sha1"},
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map[string]string{"q-ak": handler.Policy.AccessKey},
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map[string]string{"q-sign-time": keyTime},
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},
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}
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if handler.Policy.MaxSize > 0 {
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postPolicy.Conditions = append(postPolicy.Conditions,
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[]interface{}{"content-length-range", 0, handler.Policy.MaxSize})
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}
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res, err := handler.getUploadCredential(ctx, postPolicy, keyTime)
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if err == nil {
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res.Callback = apiURL
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res.Key = key
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}
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return res, err
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}
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// Meta 获取文件信息
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func (handler Driver) Meta(ctx context.Context, path string) (*MetaData, error) {
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res, err := handler.Client.Object.Head(ctx, path, &cossdk.ObjectHeadOptions{})
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if err != nil {
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return nil, err
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}
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return &MetaData{
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Size: uint64(res.ContentLength),
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CallbackKey: res.Header.Get("x-cos-meta-key"),
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CallbackURL: res.Header.Get("x-cos-meta-callback"),
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}, nil
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}
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func (handler Driver) getUploadCredential(ctx context.Context, policy UploadPolicy, keyTime string) (serializer.UploadCredential, error) {
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// 读取上下文中生成的存储路径
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savePath, ok := ctx.Value(fsctx.SavePathCtx).(string)
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if !ok {
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return serializer.UploadCredential{}, errors.New("无法获取存储路径")
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}
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// 编码上传策略
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policyJSON, err := json.Marshal(policy)
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if err != nil {
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return serializer.UploadCredential{}, err
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}
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policyEncoded := base64.StdEncoding.EncodeToString(policyJSON)
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// 签名上传策略
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hmacSign := hmac.New(sha1.New, []byte(handler.Policy.SecretKey))
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_, err = io.WriteString(hmacSign, keyTime)
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if err != nil {
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return serializer.UploadCredential{}, err
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}
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signKey := fmt.Sprintf("%x", hmacSign.Sum(nil))
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sha1Sign := sha1.New()
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_, err = sha1Sign.Write(policyJSON)
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if err != nil {
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return serializer.UploadCredential{}, err
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}
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stringToSign := fmt.Sprintf("%x", sha1Sign.Sum(nil))
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// 最终签名
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hmacFinalSign := hmac.New(sha1.New, []byte(signKey))
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_, err = hmacFinalSign.Write([]byte(stringToSign))
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if err != nil {
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return serializer.UploadCredential{}, err
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}
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signature := hmacFinalSign.Sum(nil)
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return serializer.UploadCredential{
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Policy: policyEncoded,
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Path: savePath,
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AccessKey: handler.Policy.AccessKey,
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Token: fmt.Sprintf("%x", signature),
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KeyTime: keyTime,
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}, nil
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}
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