130 lines
3.9 KiB
Go
130 lines
3.9 KiB
Go
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/serializer"
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"io"
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"net/url"
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"strings"
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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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return nil, errors.New("未实现")
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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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return errors.New("未实现")
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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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return []string{}, errors.New("未实现")
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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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return nil, errors.New("未实现")
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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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return "", errors.New("未实现")
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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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