You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
cloudreve/pkg/filesystem/driver/s3/handler.go

459 lines
11 KiB

This file contains ambiguous Unicode characters!

This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.

package s3
import (
"context"
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"encoding/json"
"errors"
"github.com/cloudreve/Cloudreve/v3/pkg/util"
"io"
"net/http"
"net/url"
"path"
"path/filepath"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
model "github.com/cloudreve/Cloudreve/v3/models"
"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"
)
// Driver 适配器模板
type Driver struct {
Policy *model.Policy
sess *session.Session
svc *s3.S3
}
// UploadPolicy S3上传策略
type UploadPolicy struct {
Expiration string `json:"expiration"`
Conditions []interface{} `json:"conditions"`
}
//MetaData 文件信息
type MetaData struct {
Size uint64
Etag string
}
// InitS3Client 初始化S3会话
func (handler *Driver) InitS3Client() error {
if handler.Policy == nil {
return errors.New("存储策略为空")
}
if handler.svc == nil {
// 初始化会话
sess, err := session.NewSession(&aws.Config{
Credentials: credentials.NewStaticCredentials(handler.Policy.AccessKey, handler.Policy.SecretKey, ""),
Endpoint: &handler.Policy.Server,
Region: &handler.Policy.OptionsSerialized.Region,
S3ForcePathStyle: aws.Bool(true),
})
if err != nil {
return err
}
handler.sess = sess
handler.svc = s3.New(sess)
}
return nil
}
// List 列出给定路径下的文件
func (handler Driver) List(ctx context.Context, base string, recursive bool) ([]response.Object, error) {
// 初始化客户端
if err := handler.InitS3Client(); err != nil {
return nil, err
}
// 初始化列目录参数
base = strings.TrimPrefix(base, "/")
if base != "" {
base += "/"
}
opt := &s3.ListObjectsInput{
Bucket: &handler.Policy.BucketName,
Prefix: &base,
MaxKeys: aws.Int64(1000),
}
// 是否为递归列出
if !recursive {
opt.Delimiter = aws.String("/")
}
var (
objects []*s3.Object
commons []*s3.CommonPrefix
)
for {
res, err := handler.svc.ListObjectsWithContext(ctx, opt)
if err != nil {
return nil, err
}
objects = append(objects, res.Contents...)
commons = append(commons, res.CommonPrefixes...)
// 如果本次未列取完则继续使用marker获取结果
if *res.IsTruncated {
opt.Marker = res.NextMarker
} else {
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(*opt.Prefix, *object.Prefix)
if err != nil {
continue
}
res = append(res, response.Object{
Name: path.Base(*object.Prefix),
RelativePath: filepath.ToSlash(rel),
Size: 0,
IsDir: true,
LastModify: time.Now(),
})
}
// 处理文件
for _, object := range objects {
rel, err := filepath.Rel(*opt.Prefix, *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: time.Now(),
})
}
return res, nil
}
// Get 获取文件
func (handler Driver) Get(ctx context.Context, path string) (response.RSCloser, error) {
// 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
client := request.HTTPClient{}
resp, err := client.Request(
"GET",
downloadURL,
nil,
request.WithContext(ctx),
request.WithHeader(
http.Header{"Cache-Control": {"no-cache", "no-store", "must-revalidate"}},
),
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 io.ReadCloser, dst string, size uint64) error {
// 初始化客户端
if err := handler.InitS3Client(); err != nil {
return err
}
uploader := s3manager.NewUploader(handler.sess)
_, err := uploader.Upload(&s3manager.UploadInput{
Bucket: &handler.Policy.BucketName,
Key: &dst,
Body: file,
})
if err != nil {
return err
}
return nil
}
// Delete 删除一个或多个文件,
// 返回未删除的文件,及遇到的最后一个错误
func (handler Driver) Delete(ctx context.Context, files []string) ([]string, error) {
// 初始化客户端
if err := handler.InitS3Client(); err != nil {
return files, err
}
failed := make([]string, 0, len(files))
deleted := make([]string, 0, len(files))
keys := make([]*s3.ObjectIdentifier, 0, len(files))
for _, file := range files {
filePath := file
keys = append(keys, &s3.ObjectIdentifier{Key: &filePath})
}
// 发送异步删除请求
res, err := handler.svc.DeleteObjects(
&s3.DeleteObjectsInput{
Bucket: &handler.Policy.BucketName,
Delete: &s3.Delete{
Objects: keys,
},
})
if err != nil {
return files, err
}
// 统计未删除的文件
for _, deleteRes := range res.Deleted {
deleted = append(deleted, *deleteRes.Key)
}
failed = util.SliceDifference(failed, deleted)
return failed, nil
}
// Thumb 获取文件缩略图
func (handler Driver) Thumb(ctx context.Context, path string) (*response.ContentResponse, error) {
return nil, errors.New("未实现")
}
// 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) {
// 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
}
// 初始化客户端
if err := handler.InitS3Client(); err != nil {
return "", err
}
req, _ := handler.svc.GetObjectRequest(
&s3.GetObjectInput{
Bucket: &handler.Policy.BucketName,
Key: &path,
ResponseContentDisposition: aws.String("attachment; filename=\"" + url.PathEscape(fileName) + "\""),
})
if ttl == 0 {
ttl = 3600
}
signedURL, _ := req.Presign(time.Duration(ttl) * time.Second)
// 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 {
finalURL.RawQuery = ""
}
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, key string) (serializer.UploadCredential, error) {
// 读取上下文中生成的存储路径和文件大小
savePath, ok := ctx.Value(fsctx.SavePathCtx).(string)
if !ok {
return serializer.UploadCredential{}, errors.New("无法获取存储路径")
}
// 生成回调地址
siteURL := model.GetSiteURL()
apiBaseURI, _ := url.Parse("/api/v3/callback/s3/" + key)
apiURL := siteURL.ResolveReference(apiBaseURI)
// 上传策略
putPolicy := UploadPolicy{
Expiration: time.Now().UTC().Add(time.Duration(TTL) * time.Second).Format(time.RFC3339),
Conditions: []interface{}{
map[string]string{"bucket": handler.Policy.BucketName},
[]string{"starts-with", "$key", savePath},
[]string{"starts-with", "$success_action_redirect", apiURL.String()},
[]string{"starts-with", "$Content-Type", ""},
map[string]string{"x-amz-algorithm": "AWS4-HMAC-SHA256"},
},
}
if handler.Policy.MaxSize > 0 {
putPolicy.Conditions = append(putPolicy.Conditions,
[]interface{}{"content-length-range", 0, handler.Policy.MaxSize})
}
// 生成上传凭证
return handler.getUploadCredential(ctx, putPolicy, apiURL)
}
// Meta 获取文件信息
func (handler Driver) Meta(ctx context.Context, path string) (*MetaData, error) {
// 初始化客户端
if err := handler.InitS3Client(); err != nil {
return nil, err
}
res, err := handler.svc.GetObject(
&s3.GetObjectInput{
Bucket: &handler.Policy.BucketName,
Key: &path,
})
if err != nil {
return nil, err
}
return &MetaData{
Size: uint64(*res.ContentLength),
Etag: *res.ETag,
}, nil
}
func (handler Driver) getUploadCredential(ctx context.Context, policy UploadPolicy, callback *url.URL) (serializer.UploadCredential, error) {
// 读取上下文中生成的存储路径和文件大小
savePath, ok := ctx.Value(fsctx.SavePathCtx).(string)
if !ok {
return serializer.UploadCredential{}, errors.New("无法获取存储路径")
}
longDate := time.Now().UTC().Format("20060102T150405Z")
shortDate := time.Now().UTC().Format("20060102")
credential := handler.Policy.AccessKey + "/" + shortDate + "/" + handler.Policy.OptionsSerialized.Region + "/s3/aws4_request"
policy.Conditions = append(policy.Conditions, map[string]string{"x-amz-credential": credential})
policy.Conditions = append(policy.Conditions, map[string]string{"x-amz-date": longDate})
// 编码上传策略
policyJSON, err := json.Marshal(policy)
if err != nil {
return serializer.UploadCredential{}, err
}
policyEncoded := base64.StdEncoding.EncodeToString(policyJSON)
//签名
signature := getHMAC([]byte("AWS4"+handler.Policy.SecretKey), []byte(shortDate))
signature = getHMAC(signature, []byte(handler.Policy.OptionsSerialized.Region))
signature = getHMAC(signature, []byte("s3"))
signature = getHMAC(signature, []byte("aws4_request"))
signature = getHMAC(signature, []byte(policyEncoded))
return serializer.UploadCredential{
Policy: policyEncoded,
Callback: callback.String(),
Token: hex.EncodeToString(signature),
AccessKey: credential,
Path: savePath,
KeyTime: longDate,
}, nil
}
func getHMAC(key []byte, data []byte) []byte {
hash := hmac.New(sha256.New, key)
hash.Write(data)
return hash.Sum(nil)
}
// CORS 创建跨域策略
func (handler Driver) CORS() error {
// 初始化客户端
if err := handler.InitS3Client(); err != nil {
return err
}
rule := s3.CORSRule{
AllowedMethods: aws.StringSlice([]string{
"GET",
"POST",
"PUT",
"DELETE",
"HEAD",
}),
AllowedOrigins: aws.StringSlice([]string{"*"}),
AllowedHeaders: aws.StringSlice([]string{"*"}),
MaxAgeSeconds: aws.Int64(3600),
}
_, err := handler.svc.PutBucketCors(&s3.PutBucketCorsInput{
Bucket: &handler.Policy.BucketName,
CORSConfiguration: &s3.CORSConfiguration{
CORSRules: []*s3.CORSRule{&rule},
},
})
return err
}