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package oss
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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/HFO4/cloudreve/pkg/util"
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"github.com/aliyun/aliyun-oss-go-sdk/oss"
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"io"
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"net/url"
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"path"
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"time"
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)
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// UploadPolicy 阿里云OSS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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// CallbackPolicy 回调策略
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type CallbackPolicy struct {
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CallbackURL string `json:"callbackUrl"`
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CallbackBody string `json:"callbackBody"`
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CallbackBodyType string `json:"callbackBodyType"`
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}
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// Handler 阿里云OSS策略适配器
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type Handler struct {
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Policy *model.Policy
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client *oss.Client
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bucket *oss.Bucket
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}
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type key int
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const (
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// VersionID 文件版本标识
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VersionID key = iota
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)
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// InitOSSClient 初始化OSS鉴权客户端
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func (handler *Handler) InitOSSClient() error {
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if handler.Policy == nil {
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return errors.New("存储策略为空")
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}
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if handler.client == nil {
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// 初始化客户端
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client, err := oss.New(handler.Policy.Server, handler.Policy.AccessKey, handler.Policy.SecretKey)
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if err != nil {
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return err
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}
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handler.client = client
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// 初始化存储桶
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bucket, err := client.Bucket(handler.Policy.BucketName)
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if err != nil {
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return err
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}
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handler.bucket = bucket
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}
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return nil
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}
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// Get 获取文件
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func (handler Handler) Get(ctx context.Context, path string) (response.RSCloser, error) {
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// 通过VersionID禁止缓存
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ctx = context.WithValue(ctx, VersionID, 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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).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 Handler) 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
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func (handler Handler) Delete(ctx context.Context, files []string) ([]string, error) {
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// 初始化客户端
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if err := handler.InitOSSClient(); err != nil {
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return files, err
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}
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// 删除文件
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delRes, err := handler.bucket.DeleteObjects(files)
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if err != nil {
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return files, err
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}
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// 统计未删除的文件
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failed := util.SliceDifference(files, delRes.DeletedObjects)
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if len(failed) > 0 {
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return failed, errors.New("删除失败")
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}
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return []string{}, nil
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}
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// Thumb 获取文件缩略图
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func (handler Handler) Thumb(ctx context.Context, path string) (*response.ContentResponse, error) {
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// 初始化客户端
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if err := handler.InitOSSClient(); err != nil {
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return nil, err
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}
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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("image/resize,m_lfit,h_%d,w_%d", thumbSize[1], thumbSize[0])
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thumbOption := []oss.Option{oss.Process(thumbParam)}
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thumbURL, 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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thumbOption,
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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 Handler) 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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// 初始化客户端
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if err := handler.InitOSSClient(); err != nil {
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return "", err
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}
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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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var signOptions = make([]oss.Option, 0, 2)
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if isDownload {
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signOptions = append(signOptions, oss.ResponseContentDisposition("attachment; filename=\""+url.PathEscape(fileName)+"\""))
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}
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if speed > 0 {
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// OSS对速度值有范围限制
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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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signOptions = append(signOptions, oss.TrafficLimitParam(int64(speed)))
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}
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return handler.signSourceURL(ctx, path, ttl, signOptions)
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}
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func (handler Handler) signSourceURL(ctx context.Context, path string, ttl int64, options []oss.Option) (string, error) {
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// 是否带有 Version ID
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if versionID, ok := ctx.Value(VersionID).(int64); ok {
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}
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signedURL, err := handler.bucket.SignURL(path, oss.HTTPGet, ttl, 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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finalURL, err := url.Parse(signedURL)
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if err != nil {
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return "", err
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}
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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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finalURL.Host = cdnURL.Host
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finalURL.Scheme = cdnURL.Scheme
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return finalURL.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 Handler) 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/oss/" + key)
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apiURL := siteURL.ResolveReference(apiBaseURI)
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// 回调策略
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callbackPolicy := CallbackPolicy{
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CallbackURL: apiURL.String(),
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CallbackBody: `{"name":${x:fname},"source_name":${object},"size":${size},"pic_info":"${imageInfo.width},${imageInfo.height}"}`,
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CallbackBodyType: "application/json",
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}
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// 上传策略
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postPolicy := UploadPolicy{
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Expiration: time.Now().UTC().Add(time.Duration(TTL) * time.Second).Format(time.RFC3339),
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Conditions: []interface{}{
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map[string]string{"bucket": handler.Policy.BucketName},
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[]string{"starts-with", "$key", path.Dir(savePath)},
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[]interface{}{"content-length-range", 0, handler.Policy.MaxSize},
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},
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}
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return handler.getUploadCredential(ctx, postPolicy, callbackPolicy, TTL)
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}
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func (handler Handler) getUploadCredential(ctx context.Context, policy UploadPolicy, callback CallbackPolicy, TTL int64) (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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// 处理回调策略
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callbackPolicyEncoded := ""
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if callback.CallbackURL != "" {
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callbackPolicyJSON, err := json.Marshal(callback)
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if err != nil {
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return serializer.UploadCredential{}, err
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}
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callbackPolicyEncoded = base64.StdEncoding.EncodeToString(callbackPolicyJSON)
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policy.Conditions = append(policy.Conditions, map[string]string{"callback": callbackPolicyEncoded})
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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, policyEncoded)
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if err != nil {
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return serializer.UploadCredential{}, err
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}
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signature := base64.StdEncoding.EncodeToString(hmacSign.Sum(nil))
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return serializer.UploadCredential{
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Policy: fmt.Sprintf("%s:%s", callbackPolicyEncoded, policyEncoded),
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Path: savePath,
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AccessKey: handler.Policy.AccessKey,
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Token: signature,
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}, nil
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}
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