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583 lines
18 KiB
583 lines
18 KiB
/*
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* Minio Cloud Storage, (C) 2015, 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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import (
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"bytes"
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"encoding/base64"
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"encoding/hex"
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"encoding/xml"
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"io"
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"io/ioutil"
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"mime/multipart"
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"net/http"
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"net/url"
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"strings"
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mux "github.com/gorilla/mux"
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)
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// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
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func enforceBucketPolicy(action string, bucket string, reqURL *url.URL) (s3Error APIErrorCode) {
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// Read saved bucket policy.
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policy, err := readBucketPolicy(bucket)
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if err != nil {
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errorIf(err, "Unable read bucket policy.")
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switch err.(type) {
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case BucketNotFound:
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return ErrNoSuchBucket
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case BucketNameInvalid:
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return ErrInvalidBucketName
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default:
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// For any other error just return AccessDenied.
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return ErrAccessDenied
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}
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}
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// Parse the saved policy.
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bucketPolicy, err := parseBucketPolicy(policy)
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if err != nil {
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errorIf(err, "Unable to parse bucket policy.")
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return ErrAccessDenied
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}
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// Construct resource in 'arn:aws:s3:::examplebucket/object' format.
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resource := AWSResourcePrefix + strings.TrimPrefix(reqURL.Path, "/")
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// Get conditions for policy verification.
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conditions := make(map[string]string)
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for queryParam := range reqURL.Query() {
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conditions[queryParam] = reqURL.Query().Get(queryParam)
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}
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// Validate action, resource and conditions with current policy statements.
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if !bucketPolicyEvalStatements(action, resource, conditions, bucketPolicy.Statements) {
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return ErrAccessDenied
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}
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return ErrNone
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}
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// GetBucketLocationHandler - GET Bucket location.
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// -------------------------
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// This operation returns bucket location.
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func (api objectAPIHandlers) GetBucketLocationHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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bucket := vars["bucket"]
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switch getRequestAuthType(r) {
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default:
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// For all unknown auth types return error.
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writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
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return
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case authTypeAnonymous:
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// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
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if s3Error := enforceBucketPolicy("s3:GetBucketLocation", bucket, r.URL); s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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case authTypeSigned, authTypePresigned:
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payload, err := ioutil.ReadAll(r.Body)
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if err != nil {
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writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
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return
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}
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// Verify Content-Md5, if payload is set.
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if r.Header.Get("Content-Md5") != "" {
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if r.Header.Get("Content-Md5") != base64.StdEncoding.EncodeToString(sumMD5(payload)) {
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writeErrorResponse(w, r, ErrBadDigest, r.URL.Path)
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return
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}
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}
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// Populate back the payload.
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r.Body = ioutil.NopCloser(bytes.NewReader(payload))
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var s3Error APIErrorCode // API error code.
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validateRegion := false // Validate region.
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if isRequestSignatureV4(r) {
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s3Error = doesSignatureMatch(hex.EncodeToString(sum256(payload)), r, validateRegion)
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} else if isRequestPresignedSignatureV4(r) {
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s3Error = doesPresignedSignatureMatch(hex.EncodeToString(sum256(payload)), r, validateRegion)
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}
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if s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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}
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if _, err := api.ObjectAPI.GetBucketInfo(bucket); err != nil {
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errorIf(err, "Unable to fetch bucket info.")
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writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
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return
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}
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// Generate response.
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encodedSuccessResponse := encodeResponse(LocationResponse{})
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// Get current region.
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region := serverConfig.GetRegion()
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if region != "us-east-1" {
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encodedSuccessResponse = encodeResponse(LocationResponse{
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Location: region,
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})
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}
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setCommonHeaders(w) // Write headers.
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writeSuccessResponse(w, encodedSuccessResponse)
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}
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// ListMultipartUploadsHandler - GET Bucket (List Multipart uploads)
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// -------------------------
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// This operation lists in-progress multipart uploads. An in-progress
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// multipart upload is a multipart upload that has been initiated,
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// using the Initiate Multipart Upload request, but has not yet been
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// completed or aborted. This operation returns at most 1,000 multipart
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// uploads in the response.
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//
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func (api objectAPIHandlers) ListMultipartUploadsHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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bucket := vars["bucket"]
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switch getRequestAuthType(r) {
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default:
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// For all unknown auth types return error.
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writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
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return
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case authTypeAnonymous:
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// http://docs.aws.amazon.com/AmazonS3/latest/dev/mpuAndPermissions.html
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if s3Error := enforceBucketPolicy("s3:ListBucketMultipartUploads", bucket, r.URL); s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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case authTypePresigned, authTypeSigned:
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if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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}
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prefix, keyMarker, uploadIDMarker, delimiter, maxUploads, _ := getBucketMultipartResources(r.URL.Query())
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if maxUploads < 0 {
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writeErrorResponse(w, r, ErrInvalidMaxUploads, r.URL.Path)
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return
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}
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if keyMarker != "" {
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// Marker not common with prefix is not implemented.
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if !strings.HasPrefix(keyMarker, prefix) {
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writeErrorResponse(w, r, ErrNotImplemented, r.URL.Path)
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return
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}
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}
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listMultipartsInfo, err := api.ObjectAPI.ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter, maxUploads)
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if err != nil {
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errorIf(err, "Unable to list multipart uploads.")
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writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
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return
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}
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// generate response
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response := generateListMultipartUploadsResponse(bucket, listMultipartsInfo)
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encodedSuccessResponse := encodeResponse(response)
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// write headers.
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setCommonHeaders(w)
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// write success response.
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writeSuccessResponse(w, encodedSuccessResponse)
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}
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// ListObjectsHandler - GET Bucket (List Objects)
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// -- -----------------------
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// This implementation of the GET operation returns some or all (up to 1000)
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// of the objects in a bucket. You can use the request parameters as selection
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// criteria to return a subset of the objects in a bucket.
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//
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func (api objectAPIHandlers) ListObjectsHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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bucket := vars["bucket"]
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switch getRequestAuthType(r) {
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default:
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// For all unknown auth types return error.
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writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
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return
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case authTypeAnonymous:
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// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
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if s3Error := enforceBucketPolicy("s3:ListBucket", bucket, r.URL); s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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case authTypeSigned, authTypePresigned:
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if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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}
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// TODO handle encoding type.
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prefix, marker, delimiter, maxkeys, _ := getBucketResources(r.URL.Query())
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if maxkeys < 0 {
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writeErrorResponse(w, r, ErrInvalidMaxKeys, r.URL.Path)
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return
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}
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// Verify if delimiter is anything other than '/', which we do not support.
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if delimiter != "" && delimiter != "/" {
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writeErrorResponse(w, r, ErrNotImplemented, r.URL.Path)
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return
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}
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// If marker is set unescape.
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if marker != "" {
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// Marker not common with prefix is not implemented.
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if !strings.HasPrefix(marker, prefix) {
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writeErrorResponse(w, r, ErrNotImplemented, r.URL.Path)
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return
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}
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}
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listObjectsInfo, err := api.ObjectAPI.ListObjects(bucket, prefix, marker, delimiter, maxkeys)
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if err == nil {
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// generate response
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response := generateListObjectsResponse(bucket, prefix, marker, delimiter, maxkeys, listObjectsInfo)
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encodedSuccessResponse := encodeResponse(response)
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// Write headers
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setCommonHeaders(w)
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// Write success response.
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writeSuccessResponse(w, encodedSuccessResponse)
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return
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}
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errorIf(err, "Unable to list objects.")
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writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
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}
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// ListBucketsHandler - GET Service
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// -----------
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// This implementation of the GET operation returns a list of all buckets
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// owned by the authenticated sender of the request.
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func (api objectAPIHandlers) ListBucketsHandler(w http.ResponseWriter, r *http.Request) {
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// List buckets does not support bucket policies.
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switch getRequestAuthType(r) {
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default:
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// For all unknown auth types return error.
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writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
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return
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case authTypeSigned, authTypePresigned:
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payload, e := ioutil.ReadAll(r.Body)
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if e != nil {
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writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
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return
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}
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// Verify Content-Md5, if payload is set.
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if r.Header.Get("Content-Md5") != "" {
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if r.Header.Get("Content-Md5") != base64.StdEncoding.EncodeToString(sumMD5(payload)) {
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writeErrorResponse(w, r, ErrBadDigest, r.URL.Path)
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return
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}
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}
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// Populate back the payload.
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r.Body = ioutil.NopCloser(bytes.NewReader(payload))
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var s3Error APIErrorCode // API error code.
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validateRegion := false // Validate region.
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if isRequestSignatureV4(r) {
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s3Error = doesSignatureMatch(hex.EncodeToString(sum256(payload)), r, validateRegion)
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} else if isRequestPresignedSignatureV4(r) {
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s3Error = doesPresignedSignatureMatch(hex.EncodeToString(sum256(payload)), r, validateRegion)
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}
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if s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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}
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bucketsInfo, err := api.ObjectAPI.ListBuckets()
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if err == nil {
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// generate response
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response := generateListBucketsResponse(bucketsInfo)
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encodedSuccessResponse := encodeResponse(response)
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// write headers
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setCommonHeaders(w)
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// write response
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writeSuccessResponse(w, encodedSuccessResponse)
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return
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}
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errorIf(err, "Unable to list buckets.")
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writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
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}
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// DeleteMultipleObjectsHandler - deletes multiple objects.
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func (api objectAPIHandlers) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
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bucket := vars["bucket"]
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switch getRequestAuthType(r) {
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default:
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// For all unknown auth types return error.
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writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
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return
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case authTypeAnonymous:
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// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
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if s3Error := enforceBucketPolicy("s3:DeleteObject", bucket, r.URL); s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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case authTypePresigned, authTypeSigned:
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if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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}
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}
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// Content-Length is required and should be non-zero
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// http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html
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if r.ContentLength <= 0 {
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writeErrorResponse(w, r, ErrMissingContentLength, r.URL.Path)
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return
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}
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// Content-Md5 is requied should be set
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// http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html
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if _, ok := r.Header["Content-Md5"]; !ok {
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writeErrorResponse(w, r, ErrMissingContentMD5, r.URL.Path)
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return
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}
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// Allocate incoming content length bytes.
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deleteXMLBytes := make([]byte, r.ContentLength)
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// Read incoming body XML bytes.
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if _, err := io.ReadFull(r.Body, deleteXMLBytes); err != nil {
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errorIf(err, "Unable to read HTTP body.")
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writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
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return
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}
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// Unmarshal list of keys to be deleted.
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deleteObjects := &DeleteObjectsRequest{}
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if err := xml.Unmarshal(deleteXMLBytes, deleteObjects); err != nil {
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errorIf(err, "Unable to unmarshal delete objects request XML.")
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writeErrorResponse(w, r, ErrMalformedXML, r.URL.Path)
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return
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}
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var deleteErrors []DeleteError
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var deletedObjects []ObjectIdentifier
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// Loop through all the objects and delete them sequentially.
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for _, object := range deleteObjects.Objects {
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err := api.ObjectAPI.DeleteObject(bucket, object.ObjectName)
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if err == nil {
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deletedObjects = append(deletedObjects, ObjectIdentifier{
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ObjectName: object.ObjectName,
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})
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} else {
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errorIf(err, "Unable to delete object.")
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deleteErrors = append(deleteErrors, DeleteError{
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Code: errorCodeResponse[toAPIErrorCode(err)].Code,
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Message: errorCodeResponse[toAPIErrorCode(err)].Description,
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Key: object.ObjectName,
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})
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}
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}
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// Generate response
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response := generateMultiDeleteResponse(deleteObjects.Quiet, deletedObjects, deleteErrors)
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encodedSuccessResponse := encodeResponse(response)
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// Write headers
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setCommonHeaders(w)
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// Write success response.
|
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writeSuccessResponse(w, encodedSuccessResponse)
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}
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// PutBucketHandler - PUT Bucket
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// ----------
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// This implementation of the PUT operation creates a new bucket for authenticated request
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func (api objectAPIHandlers) PutBucketHandler(w http.ResponseWriter, r *http.Request) {
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vars := mux.Vars(r)
|
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bucket := vars["bucket"]
|
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|
|
// Set http request for signature.
|
|
switch getRequestAuthType(r) {
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|
default:
|
|
// For all unknown auth types return error.
|
|
writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
|
|
return
|
|
case authTypePresigned, authTypeSigned:
|
|
if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
|
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writeErrorResponse(w, r, s3Error, r.URL.Path)
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return
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|
}
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}
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|
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// the location value in the request body should match the Region in serverConfig.
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// other values of location are not accepted.
|
|
// make bucket fails in such cases.
|
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errCode := isValidLocationContraint(r.Body, serverConfig.GetRegion())
|
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if errCode != ErrNone {
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writeErrorResponse(w, r, errCode, r.URL.Path)
|
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return
|
|
}
|
|
// Make bucket.
|
|
err := api.ObjectAPI.MakeBucket(bucket)
|
|
if err != nil {
|
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errorIf(err, "Unable to create a bucket.")
|
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writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
|
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return
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|
}
|
|
// Make sure to add Location information here only for bucket
|
|
w.Header().Set("Location", getLocation(r))
|
|
writeSuccessResponse(w, nil)
|
|
}
|
|
|
|
func extractHTTPFormValues(reader *multipart.Reader) (io.Reader, map[string]string, error) {
|
|
/// HTML Form values
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|
formValues := make(map[string]string)
|
|
filePart := new(bytes.Buffer)
|
|
var err error
|
|
for err == nil {
|
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var part *multipart.Part
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part, err = reader.NextPart()
|
|
if part != nil {
|
|
if part.FileName() == "" {
|
|
var buffer []byte
|
|
buffer, err = ioutil.ReadAll(part)
|
|
if err != nil {
|
|
return nil, nil, err
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}
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formValues[http.CanonicalHeaderKey(part.FormName())] = string(buffer)
|
|
} else {
|
|
if _, err = io.Copy(filePart, part); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return filePart, formValues, nil
|
|
}
|
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|
|
// PostPolicyBucketHandler - POST policy
|
|
// ----------
|
|
// This implementation of the POST operation handles object creation with a specified
|
|
// signature policy in multipart/form-data
|
|
func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *http.Request) {
|
|
// Here the parameter is the size of the form data that should
|
|
// be loaded in memory, the remaining being put in temporary files.
|
|
reader, err := r.MultipartReader()
|
|
if err != nil {
|
|
errorIf(err, "Unable to initialize multipart reader.")
|
|
writeErrorResponse(w, r, ErrMalformedPOSTRequest, r.URL.Path)
|
|
return
|
|
}
|
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|
|
fileBody, formValues, err := extractHTTPFormValues(reader)
|
|
if err != nil {
|
|
errorIf(err, "Unable to parse form values.")
|
|
writeErrorResponse(w, r, ErrMalformedPOSTRequest, r.URL.Path)
|
|
return
|
|
}
|
|
bucket := mux.Vars(r)["bucket"]
|
|
formValues["Bucket"] = bucket
|
|
object := formValues["Key"]
|
|
|
|
// Verify policy signature.
|
|
apiErr := doesPolicySignatureMatch(formValues)
|
|
if apiErr != ErrNone {
|
|
writeErrorResponse(w, r, apiErr, r.URL.Path)
|
|
return
|
|
}
|
|
if apiErr = checkPostPolicy(formValues); apiErr != ErrNone {
|
|
writeErrorResponse(w, r, apiErr, r.URL.Path)
|
|
return
|
|
}
|
|
|
|
// Save metadata.
|
|
metadata := make(map[string]string)
|
|
// Nothing to store right now.
|
|
|
|
md5Sum, err := api.ObjectAPI.PutObject(bucket, object, -1, fileBody, metadata)
|
|
if err != nil {
|
|
errorIf(err, "Unable to create object.")
|
|
writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
|
|
return
|
|
}
|
|
if md5Sum != "" {
|
|
w.Header().Set("ETag", "\""+md5Sum+"\"")
|
|
}
|
|
encodedSuccessResponse := encodeResponse(PostResponse{
|
|
Location: getObjectLocation(bucket, object), // TODO Full URL is preferred
|
|
Bucket: bucket,
|
|
Key: object,
|
|
ETag: md5Sum,
|
|
})
|
|
setCommonHeaders(w)
|
|
writeSuccessResponse(w, encodedSuccessResponse)
|
|
}
|
|
|
|
// HeadBucketHandler - HEAD Bucket
|
|
// ----------
|
|
// This operation is useful to determine if a bucket exists.
|
|
// The operation returns a 200 OK if the bucket exists and you
|
|
// have permission to access it. Otherwise, the operation might
|
|
// return responses such as 404 Not Found and 403 Forbidden.
|
|
func (api objectAPIHandlers) HeadBucketHandler(w http.ResponseWriter, r *http.Request) {
|
|
vars := mux.Vars(r)
|
|
bucket := vars["bucket"]
|
|
|
|
switch getRequestAuthType(r) {
|
|
default:
|
|
// For all unknown auth types return error.
|
|
writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
|
|
return
|
|
case authTypeAnonymous:
|
|
// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
|
|
if s3Error := enforceBucketPolicy("s3:ListBucket", bucket, r.URL); s3Error != ErrNone {
|
|
writeErrorResponse(w, r, s3Error, r.URL.Path)
|
|
return
|
|
}
|
|
case authTypePresigned, authTypeSigned:
|
|
if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
|
|
writeErrorResponse(w, r, s3Error, r.URL.Path)
|
|
return
|
|
}
|
|
}
|
|
|
|
if _, err := api.ObjectAPI.GetBucketInfo(bucket); err != nil {
|
|
errorIf(err, "Unable to fetch bucket info.")
|
|
writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
|
|
return
|
|
}
|
|
writeSuccessResponse(w, nil)
|
|
}
|
|
|
|
// DeleteBucketHandler - Delete bucket
|
|
func (api objectAPIHandlers) DeleteBucketHandler(w http.ResponseWriter, r *http.Request) {
|
|
vars := mux.Vars(r)
|
|
bucket := vars["bucket"]
|
|
|
|
switch getRequestAuthType(r) {
|
|
default:
|
|
// For all unknown auth types return error.
|
|
writeErrorResponse(w, r, ErrAccessDenied, r.URL.Path)
|
|
return
|
|
case authTypePresigned, authTypeSigned:
|
|
if s3Error := isReqAuthenticated(r); s3Error != ErrNone {
|
|
writeErrorResponse(w, r, s3Error, r.URL.Path)
|
|
return
|
|
}
|
|
}
|
|
|
|
if err := api.ObjectAPI.DeleteBucket(bucket); err != nil {
|
|
errorIf(err, "Unable to delete a bucket.")
|
|
writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
|
|
return
|
|
}
|
|
|
|
// Delete bucket access policy, if present - ignore any errors.
|
|
removeBucketPolicy(bucket)
|
|
|
|
// Write success response.
|
|
writeSuccessNoContent(w)
|
|
}
|
|
|