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cloudreve/pkg/filesystem/driver/s3/handler.go

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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.NewClient()
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", "$name", ""},
[]string{"starts-with", "$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
}