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package upyun
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import (
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"context"
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"crypto/hmac"
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"crypto/md5"
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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/upyun/go-sdk/upyun"
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"io"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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// UploadPolicy 又拍云上传策略
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type UploadPolicy struct {
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Bucket string `json:"bucket"`
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SaveKey string `json:"save-key"`
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Expiration int64 `json:"expiration"`
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CallbackURL string `json:"notify-url"`
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ContentLength uint64 `json:"content-length"`
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ContentLengthRange string `json:"content-length-range"`
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AllowFileType string `json:"allow-file-type,omitempty"`
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}
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// Driver 又拍云策略适配器
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type Driver struct {
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Policy *model.Policy
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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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// 给文件名加上随机参数以强制拉取
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path = fmt.Sprintf("%s?v=%d", path, time.Now().UnixNano())
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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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client := request.HTTPClient{}
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resp, err := 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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request.WithHeader(
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http.Header{"Cache-Control": {"no-cache", "no-store", "must-revalidate"}},
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),
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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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defer file.Close()
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up := upyun.NewUpYun(&upyun.UpYunConfig{
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Bucket: handler.Policy.BucketName,
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Operator: handler.Policy.AccessKey,
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Password: handler.Policy.SecretKey,
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})
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err := up.Put(&upyun.PutObjectConfig{
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Path: dst,
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Reader: file,
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})
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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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up := upyun.NewUpYun(&upyun.UpYunConfig{
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Bucket: handler.Policy.BucketName,
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Operator: handler.Policy.AccessKey,
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Password: handler.Policy.SecretKey,
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})
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var (
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failed = make([]string, 0, len(files))
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lastErr error
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currentIndex = 0
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indexLock sync.Mutex
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failedLock sync.Mutex
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wg sync.WaitGroup
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routineNum = 4
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)
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wg.Add(routineNum)
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// upyun不支持批量操作，这里开四个协程并行操作
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for i := 0; i < routineNum; i++ {
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go func() {
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for {
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// 取得待删除文件
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indexLock.Lock()
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if currentIndex >= len(files) {
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// 所有文件处理完成
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wg.Done()
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indexLock.Unlock()
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return
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}
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path := files[currentIndex]
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currentIndex++
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indexLock.Unlock()
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// 发送异步删除请求
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err := up.Delete(&upyun.DeleteObjectConfig{
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Path: path,
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Async: true,
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})
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// 处理错误
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if err != nil {
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failedLock.Lock()
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lastErr = err
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failed = append(failed, path)
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failedLock.Unlock()
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}
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}
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}()
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}
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wg.Wait()
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return failed, lastErr
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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("!/fwfh/%dx%d", thumbSize[0], thumbSize[1])
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thumbURL, err := handler.Source(
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ctx,
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path+thumbParam,
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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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return &response.ContentResponse{
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Redirect: true,
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URL: thumbURL,
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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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sourceURL, 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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fileKey, 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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sourceURL = sourceURL.ResolveReference(fileKey)
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// 如果是下载文件URL
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if isDownload {
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query := sourceURL.Query()
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query.Add("_upd", fileName)
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sourceURL.RawQuery = query.Encode()
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}
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return handler.signURL(ctx, sourceURL, ttl)
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}
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func (handler Driver) signURL(ctx context.Context, path *url.URL, TTL int64) (string, error) {
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if !handler.Policy.IsPrivate {
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// 未开启Token防盗链时，直接返回
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return path.String(), nil
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}
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etime := time.Now().Add(time.Duration(TTL) * time.Second).Unix()
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signStr := fmt.Sprintf(
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"%s&%d&%s",
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handler.Policy.OptionsSerialized.Token,
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etime,
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path.Path,
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)
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signMd5 := fmt.Sprintf("%x", md5.Sum([]byte(signStr)))
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finalSign := signMd5[12:20] + strconv.FormatInt(etime, 10)
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// 将签名添加到URL中
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query := path.Query()
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query.Add("_upt", finalSign)
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path.RawQuery = query.Encode()
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return path.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和文件大小
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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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fileSize, ok := ctx.Value(fsctx.FileSizeCtx).(uint64)
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if !ok {
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return serializer.UploadCredential{}, errors.New("无法获取文件大小")
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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/upyun/" + key)
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apiURL := siteURL.ResolveReference(apiBaseURI)
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// 上传策略
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putPolicy := UploadPolicy{
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Bucket: handler.Policy.BucketName,
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// TODO escape
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SaveKey: savePath,
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Expiration: time.Now().Add(time.Duration(TTL) * time.Second).Unix(),
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CallbackURL: apiURL.String(),
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ContentLength: fileSize,
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ContentLengthRange: fmt.Sprintf("0,%d", fileSize),
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AllowFileType: strings.Join(handler.Policy.OptionsSerialized.FileType, ","),
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}
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// 生成上传凭证
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return handler.getUploadCredential(ctx, putPolicy)
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}
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func (handler Driver) getUploadCredential(ctx context.Context, policy UploadPolicy) (serializer.UploadCredential, error) {
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// 生成上传策略
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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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// 生成签名
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elements := []string{"POST", "/" + handler.Policy.BucketName, policyEncoded}
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signStr := handler.Sign(ctx, elements)
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return serializer.UploadCredential{
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Policy: policyEncoded,
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Token: signStr,
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}, nil
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}
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// Sign 计算又拍云的签名头
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func (handler Driver) Sign(ctx context.Context, elements []string) string {
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password := fmt.Sprintf("%x", md5.Sum([]byte(handler.Policy.SecretKey)))
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mac := hmac.New(sha1.New, []byte(password))
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value := strings.Join(elements, "&")
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mac.Write([]byte(value))
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signStr := base64.StdEncoding.EncodeToString((mac.Sum(nil)))
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return fmt.Sprintf("UPYUN %s:%s", handler.Policy.AccessKey, signStr)
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}
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