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/*
* MinIO Go Library for Amazon S3 Compatible Cloud Storage
* Copyright 2023 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package minio
import (
"context"
"encoding/json"
"errors"
"io"
"mime/multipart"
"net/http"
"strconv"
"strings"
"time"
"github.com/minio/minio-go/v7/pkg/encrypt"
)
// PutObjectFanOutEntry is per object entry fan-out metadata
type PutObjectFanOutEntry struct {
Key string `json:"key"`
UserMetadata map[string]string `json:"metadata,omitempty"`
UserTags map[string]string `json:"tags,omitempty"`
ContentType string `json:"contentType,omitempty"`
ContentEncoding string `json:"contentEncoding,omitempty"`
ContentDisposition string `json:"contentDisposition,omitempty"`
ContentLanguage string `json:"contentLanguage,omitempty"`
CacheControl string `json:"cacheControl,omitempty"`
Retention RetentionMode `json:"retention,omitempty"`
RetainUntilDate *time.Time `json:"retainUntil,omitempty"`
}
// PutObjectFanOutRequest this is the request structure sent
// to the server to fan-out the stream to multiple objects.
type PutObjectFanOutRequest struct {
Entries []PutObjectFanOutEntry
Checksum Checksum
SSE encrypt.ServerSide
}
// PutObjectFanOutResponse this is the response structure sent
// by the server upon success or failure for each object
// fan-out keys. Additionally, this response carries ETag,
// VersionID and LastModified for each object fan-out.
type PutObjectFanOutResponse struct {
Key string `json:"key"`
ETag string `json:"etag,omitempty"`
VersionID string `json:"versionId,omitempty"`
LastModified *time.Time `json:"lastModified,omitempty"`
Error string `json:"error,omitempty"`
}
// PutObjectFanOut - is a variant of PutObject instead of writing a single object from a single
// stream multiple objects are written, defined via a list of PutObjectFanOutRequests. Each entry
// in PutObjectFanOutRequest carries an object keyname and its relevant metadata if any. `Key` is
// mandatory, rest of the other options in PutObjectFanOutRequest are optional.
func (c *Client) PutObjectFanOut(ctx context.Context, bucket string, fanOutData io.Reader, fanOutReq PutObjectFanOutRequest) ([]PutObjectFanOutResponse, error) {
if len(fanOutReq.Entries) == 0 {
return nil, errInvalidArgument("fan out requests cannot be empty")
}
policy := NewPostPolicy()
policy.SetBucket(bucket)
policy.SetKey(strconv.FormatInt(time.Now().UnixNano(), 16))
// Expires in 15 minutes.
policy.SetExpires(time.Now().UTC().Add(15 * time.Minute))
// Set encryption headers if any.
policy.SetEncryption(fanOutReq.SSE)
// Set checksum headers if any.
policy.SetChecksum(fanOutReq.Checksum)
url, formData, err := c.PresignedPostPolicy(ctx, policy)
if err != nil {
return nil, err
}
r, w := io.Pipe()
req, err := http.NewRequest(http.MethodPost, url.String(), r)
if err != nil {
w.Close()
return nil, err
}
var b strings.Builder
enc := json.NewEncoder(&b)
for _, req := range fanOutReq.Entries {
if req.Key == "" {
w.Close()
return nil, errors.New("PutObjectFanOutRequest.Key is mandatory and cannot be empty")
}
if err = enc.Encode(&req); err != nil {
w.Close()
return nil, err
}
}
mwriter := multipart.NewWriter(w)
req.Header.Add("Content-Type", mwriter.FormDataContentType())
go func() {
defer w.Close()
defer mwriter.Close()
for k, v := range formData {
if err := mwriter.WriteField(k, v); err != nil {
return
}
}
if err := mwriter.WriteField("x-minio-fanout-list", b.String()); err != nil {
return
}
mw, err := mwriter.CreateFormFile("file", "fanout-content")
if err != nil {
return
}
if _, err = io.Copy(mw, fanOutData); err != nil {
return
}
}()
resp, err := c.do(req)
if err != nil {
return nil, err
}
defer closeResponse(resp)
if resp.StatusCode != http.StatusOK {
return nil, httpRespToErrorResponse(resp, bucket, "fanout-content")
}
dec := json.NewDecoder(resp.Body)
fanOutResp := make([]PutObjectFanOutResponse, 0, len(fanOutReq.Entries))
for dec.More() {
var m PutObjectFanOutResponse
if err = dec.Decode(&m); err != nil {
return nil, err
}
fanOutResp = append(fanOutResp, m)
}
return fanOutResp, nil
}
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