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cloudreve/pkg/filesystem/driver/oss/handler.go

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package oss
import (
"context"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"net/url"
"path"
"path/filepath"
"strings"
"time"
"github.com/HFO4/aliyun-oss-go-sdk/oss"
model "github.com/cloudreve/Cloudreve/v3/models"
"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/chunk"
"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/chunk/backoff"
"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/fsctx"
"github.com/cloudreve/Cloudreve/v3/pkg/filesystem/response"
"github.com/cloudreve/Cloudreve/v3/pkg/request"
"github.com/cloudreve/Cloudreve/v3/pkg/serializer"
"github.com/cloudreve/Cloudreve/v3/pkg/util"
)
// UploadPolicy 阿里云OSS上传策略
type UploadPolicy struct {
Expiration string `json:"expiration"`
Conditions []interface{} `json:"conditions"`
}
// CallbackPolicy 回调策略
type CallbackPolicy struct {
CallbackURL string `json:"callbackUrl"`
CallbackBody string `json:"callbackBody"`
CallbackBodyType string `json:"callbackBodyType"`
}
// Driver 阿里云OSS策略适配器
type Driver struct {
Policy *model.Policy
client *oss.Client
bucket *oss.Bucket
HTTPClient request.Client
}
type key int
const (
chunkRetrySleep = time.Duration(5) * time.Second
// MultiPartUploadThreshold 服务端使用分片上传的阈值
MultiPartUploadThreshold uint64 = 5 * (1 << 30) // 5GB
// VersionID 文件版本标识
VersionID key = iota
)
func NewDriver(policy *model.Policy) (*Driver, error) {
if policy.OptionsSerialized.ChunkSize == 0 {
policy.OptionsSerialized.ChunkSize = 25 << 20 // 25 MB
}
driver := &Driver{
Policy: policy,
HTTPClient: request.NewClient(),
}
return driver, driver.InitOSSClient(false)
}
// CORS 创建跨域策略
func (handler *Driver) CORS() error {
return handler.client.SetBucketCORS(handler.Policy.BucketName, []oss.CORSRule{
{
AllowedOrigin: []string{"*"},
AllowedMethod: []string{
"GET",
"POST",
"PUT",
"DELETE",
"HEAD",
},
ExposeHeader: []string{},
AllowedHeader: []string{"*"},
MaxAgeSeconds: 3600,
},
})
}
// InitOSSClient 初始化OSS鉴权客户端
func (handler *Driver) InitOSSClient(forceUsePublicEndpoint bool) error {
if handler.Policy == nil {
return errors.New("存储策略为空")
}
// 决定是否使用内网 Endpoint
endpoint := handler.Policy.Server
if handler.Policy.OptionsSerialized.ServerSideEndpoint != "" && !forceUsePublicEndpoint {
endpoint = handler.Policy.OptionsSerialized.ServerSideEndpoint
}
// 初始化客户端
client, err := oss.New(endpoint, handler.Policy.AccessKey, handler.Policy.SecretKey)
if err != nil {
return err
}
handler.client = client
// 初始化存储桶
bucket, err := client.Bucket(handler.Policy.BucketName)
if err != nil {
return err
}
handler.bucket = bucket
return nil
}
// List 列出OSS上的文件
func (handler *Driver) List(ctx context.Context, base string, recursive bool) ([]response.Object, error) {
// 列取文件
base = strings.TrimPrefix(base, "/")
if base != "" {
base += "/"
}
var (
delimiter string
marker string
objects []oss.ObjectProperties
commons []string
)
if !recursive {
delimiter = "/"
}
for {
subRes, err := handler.bucket.ListObjects(oss.Marker(marker), oss.Prefix(base),
oss.MaxKeys(1000), oss.Delimiter(delimiter))
if err != nil {
return nil, err
}
objects = append(objects, subRes.Objects...)
commons = append(commons, subRes.CommonPrefixes...)
marker = subRes.NextMarker
if marker == "" {
break
}
}
// 处理列取结果
res := make([]response.Object, 0, len(objects)+len(commons))
// 处理目录
for _, object := range commons {
rel, err := filepath.Rel(base, object)
if err != nil {
continue
}
res = append(res, response.Object{
Name: path.Base(object),
RelativePath: filepath.ToSlash(rel),
Size: 0,
IsDir: true,
LastModify: time.Now(),
})
}
// 处理文件
for _, object := range objects {
rel, err := filepath.Rel(base, object.Key)
if err != nil {
continue
}
res = append(res, response.Object{
Name: path.Base(object.Key),
Source: object.Key,
RelativePath: filepath.ToSlash(rel),
Size: uint64(object.Size),
IsDir: false,
LastModify: object.LastModified,
})
}
return res, nil
}
// Get 获取文件
func (handler *Driver) Get(ctx context.Context, path string) (response.RSCloser, error) {
// 通过VersionID禁止缓存
ctx = context.WithValue(ctx, VersionID, time.Now().UnixNano())
// 尽可能使用私有 Endpoint
ctx = context.WithValue(ctx, fsctx.ForceUsePublicEndpointCtx, false)
// 获取文件源地址
downloadURL, err := handler.Source(
ctx,
path,
url.URL{},
int64(model.GetIntSetting("preview_timeout", 60)),
false,
0,
)
if err != nil {
return nil, err
}
// 获取文件数据流
resp, err := handler.HTTPClient.Request(
"GET",
downloadURL,
nil,
request.WithContext(ctx),
request.WithTimeout(time.Duration(0)),
).CheckHTTPResponse(200).GetRSCloser()
if err != nil {
return nil, err
}
resp.SetFirstFakeChunk()
// 尝试自主获取文件大小
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()
fileInfo := file.Info()
// 凭证有效期
credentialTTL := model.GetIntSetting("upload_session_timeout", 3600)
// 是否允许覆盖
overwrite := fileInfo.Mode&fsctx.Overwrite == fsctx.Overwrite
options := []oss.Option{
oss.Expires(time.Now().Add(time.Duration(credentialTTL) * time.Second)),
oss.ForbidOverWrite(!overwrite),
}
// 小文件直接上传
if fileInfo.Size < MultiPartUploadThreshold {
return handler.bucket.PutObject(fileInfo.SavePath, file, options...)
}
// 超过阈值时使用分片上传
imur, err := handler.bucket.InitiateMultipartUpload(fileInfo.SavePath, options...)
if err != nil {
return fmt.Errorf("failed to initiate multipart upload: %w", err)
}
chunks := chunk.NewChunkGroup(file, handler.Policy.OptionsSerialized.ChunkSize, &backoff.ConstantBackoff{
Max: model.GetIntSetting("chunk_retries", 5),
Sleep: chunkRetrySleep,
}, model.IsTrueVal(model.GetSettingByName("use_temp_chunk_buffer")))
uploadFunc := func(current *chunk.ChunkGroup, content io.Reader) error {
_, err := handler.bucket.UploadPart(imur, content, current.Length(), current.Index()+1)
return err
}
for chunks.Next() {
if err := chunks.Process(uploadFunc); err != nil {
return fmt.Errorf("failed to upload chunk #%d: %w", chunks.Index(), err)
}
}
_, err = handler.bucket.CompleteMultipartUpload(imur, oss.CompleteAll("yes"), oss.ForbidOverWrite(!overwrite))
return err
}
// Delete 删除一个或多个文件,
// 返回未删除的文件
func (handler *Driver) Delete(ctx context.Context, files []string) ([]string, error) {
// 删除文件
delRes, err := handler.bucket.DeleteObjects(files)
if err != nil {
return files, err
}
// 统计未删除的文件
failed := util.SliceDifference(files, delRes.DeletedObjects)
if len(failed) > 0 {
return failed, errors.New("删除失败")
}
return []string{}, nil
}
// Thumb 获取文件缩略图
func (handler *Driver) Thumb(ctx context.Context, path string) (*response.ContentResponse, error) {
// 初始化客户端
if err := handler.InitOSSClient(true); err != nil {
return nil, err
}
var (
thumbSize = [2]uint{400, 300}
ok = false
)
if thumbSize, ok = ctx.Value(fsctx.ThumbSizeCtx).([2]uint); !ok {
return nil, errors.New("无法获取缩略图尺寸设置")
}
thumbParam := fmt.Sprintf("image/resize,m_lfit,h_%d,w_%d", thumbSize[1], thumbSize[0])
ctx = context.WithValue(ctx, fsctx.ThumbSizeCtx, thumbParam)
thumbOption := []oss.Option{oss.Process(thumbParam)}
thumbURL, err := handler.signSourceURL(
ctx,
path,
int64(model.GetIntSetting("preview_timeout", 60)),
thumbOption,
)
if err != nil {
return nil, err
}
return &response.ContentResponse{
Redirect: true,
URL: thumbURL,
}, 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) {
// 初始化客户端
usePublicEndpoint := true
if forceUsePublicEndpoint, ok := ctx.Value(fsctx.ForceUsePublicEndpointCtx).(bool); ok {
usePublicEndpoint = forceUsePublicEndpoint
}
if err := handler.InitOSSClient(usePublicEndpoint); err != nil {
return "", err
}
// 尝试从上下文获取文件名
fileName := ""
if file, ok := ctx.Value(fsctx.FileModelCtx).(model.File); ok {
fileName = file.Name
}
// 添加各项设置
var signOptions = make([]oss.Option, 0, 2)
if isDownload {
signOptions = append(signOptions, oss.ResponseContentDisposition("attachment; filename=\""+url.PathEscape(fileName)+"\""))
}
if speed > 0 {
// Byte 转换为 bit
speed *= 8
// OSS对速度值有范围限制
if speed < 819200 {
speed = 819200
}
if speed > 838860800 {
speed = 838860800
}
signOptions = append(signOptions, oss.TrafficLimitParam(int64(speed)))
}
return handler.signSourceURL(ctx, path, ttl, signOptions)
}
func (handler *Driver) signSourceURL(ctx context.Context, path string, ttl int64, options []oss.Option) (string, error) {
signedURL, err := handler.bucket.SignURL(path, oss.HTTPGet, ttl, options...)
if err != nil {
return "", err
}
// 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
finalURL, err := url.Parse(signedURL)
if err != nil {
return "", err
}
// 公有空间替换掉Key及不支持的头
if !handler.Policy.IsPrivate {
query := finalURL.Query()
query.Del("OSSAccessKeyId")
query.Del("Signature")
query.Del("response-content-disposition")
query.Del("x-oss-traffic-limit")
finalURL.RawQuery = query.Encode()
}
if handler.Policy.BaseURL != "" {
cdnURL, err := url.Parse(handler.Policy.BaseURL)
if err != nil {
return "", err
}
finalURL.Host = cdnURL.Host
finalURL.Scheme = cdnURL.Scheme
}
return finalURL.String(), 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) {
// 初始化客户端
if err := handler.InitOSSClient(true); err != nil {
return nil, err
}
// 生成回调地址
siteURL := model.GetSiteURL()
apiBaseURI, _ := url.Parse("/api/v3/callback/oss/" + uploadSession.Key)
apiURL := siteURL.ResolveReference(apiBaseURI)
// 回调策略
callbackPolicy := CallbackPolicy{
CallbackURL: apiURL.String(),
CallbackBody: `{"name":${x:fname},"source_name":${object},"size":${size},"pic_info":"${imageInfo.width},${imageInfo.height}"}`,
CallbackBodyType: "application/json",
}
callbackPolicyJSON, err := json.Marshal(callbackPolicy)
if err != nil {
return nil, fmt.Errorf("failed to encode callback policy: %w", err)
}
callbackPolicyEncoded := base64.StdEncoding.EncodeToString(callbackPolicyJSON)
// 初始化分片上传
fileInfo := file.Info()
options := []oss.Option{
oss.Expires(time.Now().Add(time.Duration(ttl) * time.Second)),
oss.ForbidOverWrite(true),
}
imur, err := handler.bucket.InitiateMultipartUpload(fileInfo.SavePath, options...)
if err != nil {
return nil, fmt.Errorf("failed to initialize multipart upload: %w", err)
}
uploadSession.UploadID = imur.UploadID
// 为每个分片签名上传 URL
chunks := chunk.NewChunkGroup(file, handler.Policy.OptionsSerialized.ChunkSize, &backoff.ConstantBackoff{}, false)
urls := make([]string, chunks.Num())
for chunks.Next() {
err := chunks.Process(func(c *chunk.ChunkGroup, chunk io.Reader) error {
signedURL, err := handler.bucket.SignURL(fileInfo.SavePath, oss.HTTPPut, ttl,
oss.PartNumber(c.Index()+1),
oss.UploadID(imur.UploadID),
oss.ContentType("application/octet-stream"))
if err != nil {
return err
}
urls[c.Index()] = signedURL
return nil
})
if err != nil {
return nil, err
}
}
// 签名完成分片上传的URL
completeURL, err := handler.bucket.SignURL(fileInfo.SavePath, oss.HTTPPost, ttl,
oss.ContentType("application/octet-stream"),
oss.UploadID(imur.UploadID),
oss.Expires(time.Now().Add(time.Duration(ttl)*time.Second)),
oss.CompleteAll("yes"),
oss.ForbidOverWrite(true),
oss.CallbackParam(callbackPolicyEncoded))
if err != nil {
return nil, err
}
return &serializer.UploadCredential{
SessionID: uploadSession.Key,
ChunkSize: handler.Policy.OptionsSerialized.ChunkSize,
UploadID: imur.UploadID,
UploadURLs: urls,
CompleteURL: completeURL,
}, nil
}
// 取消上传凭证
func (handler *Driver) CancelToken(ctx context.Context, uploadSession *serializer.UploadSession) error {
return handler.bucket.AbortMultipartUpload(oss.InitiateMultipartUploadResult{UploadID: uploadSession.UploadID, Key: uploadSession.SavePath}, nil)
}