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5f7565762e
This change is cleanup of the postPolicyHandler code primarily to address the flow and also converting certain critical parts into self contained functions.
625 lines
19 KiB
Go
625 lines
19 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015, 2016, 2017 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 cmd
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import (
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"encoding/base64"
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"encoding/xml"
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"io"
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"net/http"
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"net/url"
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"path"
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"strings"
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"sync"
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mux "github.com/gorilla/mux"
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"github.com/minio/minio-go/pkg/set"
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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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// Enforces bucket policies for a bucket for a given tatusaction.
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func enforceBucketPolicy(bucket, action, resource, referer string, queryParams url.Values) (s3Error APIErrorCode) {
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// Verify if bucket actually exists
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if err := checkBucketExist(bucket, newObjectLayerFn()); err != nil {
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err = errorCause(err)
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switch err.(type) {
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case BucketNameInvalid:
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// Return error for invalid bucket name.
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return ErrInvalidBucketName
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case BucketNotFound:
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// For no bucket found we return NoSuchBucket instead.
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return ErrNoSuchBucket
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}
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errorIf(err, "Unable to read bucket policy.")
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// Return internal error for any other errors so that we can investigate.
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return ErrInternalError
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}
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// Fetch bucket policy, if policy is not set return access denied.
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policy := globalBucketPolicies.GetBucketPolicy(bucket)
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if policy == nil {
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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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arn := bucketARNPrefix + strings.TrimSuffix(strings.TrimPrefix(resource, "/"), "/")
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// Get conditions for policy verification.
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conditionKeyMap := make(map[string]set.StringSet)
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for queryParam := range queryParams {
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conditionKeyMap[queryParam] = set.CreateStringSet(queryParams.Get(queryParam))
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}
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// Add request referer to conditionKeyMap if present.
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if referer != "" {
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conditionKeyMap["referer"] = set.CreateStringSet(referer)
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}
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// Validate action, resource and conditions with current policy statements.
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if !bucketPolicyEvalStatements(action, arn, conditionKeyMap, policy.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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// Check if the action is allowed on the bucket/prefix.
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func isBucketActionAllowed(action, bucket, prefix string) bool {
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policy := globalBucketPolicies.GetBucketPolicy(bucket)
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if policy == nil {
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return false
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}
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resource := bucketARNPrefix + path.Join(bucket, prefix)
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var conditionKeyMap map[string]set.StringSet
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// Validate action, resource and conditions with current policy statements.
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return bucketPolicyEvalStatements(action, resource, conditionKeyMap, policy.Statements)
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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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objectAPI := api.ObjectAPI()
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if objectAPI == nil {
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writeErrorResponse(w, ErrServerNotInitialized, r.URL)
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return
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}
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s3Error := checkRequestAuthType(r, bucket, "s3:GetBucketLocation", globalMinioDefaultRegion)
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if s3Error == ErrInvalidRegion {
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// Clients like boto3 send getBucketLocation() call signed with region that is configured.
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s3Error = checkRequestAuthType(r, "", "s3:GetBucketLocation", serverConfig.GetRegion())
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}
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if s3Error != ErrNone {
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writeErrorResponse(w, s3Error, r.URL)
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return
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}
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if _, err := objectAPI.GetBucketInfo(bucket); err != nil {
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errorIf(err, "Unable to fetch bucket info.")
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writeErrorResponse(w, toAPIErrorCode(err), r.URL)
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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 != globalMinioDefaultRegion {
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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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// Write success response.
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writeSuccessResponseXML(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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objectAPI := api.ObjectAPI()
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if objectAPI == nil {
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writeErrorResponse(w, ErrServerNotInitialized, r.URL)
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return
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}
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if s3Error := checkRequestAuthType(r, bucket, "s3:ListBucketMultipartUploads", serverConfig.GetRegion()); s3Error != ErrNone {
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writeErrorResponse(w, s3Error, r.URL)
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return
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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, ErrInvalidMaxUploads, r.URL)
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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 !hasPrefix(keyMarker, prefix) {
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writeErrorResponse(w, ErrNotImplemented, r.URL)
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return
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}
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}
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listMultipartsInfo, err := 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, toAPIErrorCode(err), r.URL)
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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 success response.
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writeSuccessResponseXML(w, encodedSuccessResponse)
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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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objectAPI := api.ObjectAPI()
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if objectAPI == nil {
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writeErrorResponse(w, ErrServerNotInitialized, r.URL)
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return
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}
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// ListBuckets does not have any bucket action.
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s3Error := checkRequestAuthType(r, "", "", globalMinioDefaultRegion)
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if s3Error == ErrInvalidRegion {
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// Clients like boto3 send listBuckets() call signed with region that is configured.
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s3Error = checkRequestAuthType(r, "", "", serverConfig.GetRegion())
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}
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if s3Error != ErrNone {
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writeErrorResponse(w, s3Error, r.URL)
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return
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}
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// Invoke the list buckets.
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bucketsInfo, err := objectAPI.ListBuckets()
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if err != nil {
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errorIf(err, "Unable to list buckets.")
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writeErrorResponse(w, toAPIErrorCode(err), r.URL)
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return
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}
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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 response.
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writeSuccessResponseXML(w, encodedSuccessResponse)
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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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objectAPI := api.ObjectAPI()
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if objectAPI == nil {
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writeErrorResponse(w, ErrServerNotInitialized, r.URL)
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return
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}
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if s3Error := checkRequestAuthType(r, bucket, "s3:DeleteObject", serverConfig.GetRegion()); s3Error != ErrNone {
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writeErrorResponse(w, s3Error, r.URL)
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return
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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, ErrMissingContentLength, r.URL)
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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, ErrMissingContentMD5, r.URL)
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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, ErrInternalError, r.URL)
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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, ErrMalformedXML, r.URL)
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return
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}
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var wg = &sync.WaitGroup{} // Allocate a new wait group.
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var dErrs = make([]error, len(deleteObjects.Objects))
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// Delete all requested objects in parallel.
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for index, object := range deleteObjects.Objects {
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wg.Add(1)
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go func(i int, obj ObjectIdentifier) {
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objectLock := globalNSMutex.NewNSLock(bucket, obj.ObjectName)
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objectLock.Lock()
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defer objectLock.Unlock()
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defer wg.Done()
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dErr := objectAPI.DeleteObject(bucket, obj.ObjectName)
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if dErr != nil {
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dErrs[i] = dErr
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}
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}(index, object)
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}
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wg.Wait()
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// Collect deleted objects and errors if any.
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var deletedObjects []ObjectIdentifier
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var deleteErrors []DeleteError
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for index, err := range dErrs {
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object := deleteObjects.Objects[index]
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// Success deleted objects are collected separately.
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if err == nil {
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deletedObjects = append(deletedObjects, object)
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continue
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}
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if _, ok := errorCause(err).(ObjectNotFound); ok {
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// If the object is not found it should be
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// accounted as deleted as per S3 spec.
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deletedObjects = append(deletedObjects, object)
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continue
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}
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errorIf(err, "Unable to delete object. %s", object.ObjectName)
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// Error during delete should be collected separately.
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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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// Generate response
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response := generateMultiDeleteResponse(deleteObjects.Quiet, deletedObjects, deleteErrors)
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encodedSuccessResponse := encodeResponse(response)
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// Write success response.
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writeSuccessResponseXML(w, encodedSuccessResponse)
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// Notify deleted event for objects.
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for _, dobj := range deletedObjects {
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eventNotify(eventData{
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Type: ObjectRemovedDelete,
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Bucket: bucket,
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ObjInfo: ObjectInfo{
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Name: dobj.ObjectName,
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},
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ReqParams: extractReqParams(r),
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})
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}
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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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objectAPI := api.ObjectAPI()
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if objectAPI == nil {
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writeErrorResponse(w, ErrServerNotInitialized, r.URL)
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return
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}
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// PutBucket does not have any bucket action.
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s3Error := checkRequestAuthType(r, "", "", globalMinioDefaultRegion)
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if s3Error == ErrInvalidRegion {
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// Clients like boto3 send putBucket() call signed with region that is configured.
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s3Error = checkRequestAuthType(r, "", "", serverConfig.GetRegion())
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}
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if s3Error != ErrNone {
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writeErrorResponse(w, s3Error, r.URL)
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return
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}
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vars := mux.Vars(r)
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bucket := vars["bucket"]
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// Validate if incoming location constraint is valid, reject
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// requests which do not follow valid region requirements.
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if s3Error := isValidLocationConstraint(r); s3Error != ErrNone {
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writeErrorResponse(w, s3Error, r.URL)
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return
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}
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bucketLock := globalNSMutex.NewNSLock(bucket, "")
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bucketLock.Lock()
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defer bucketLock.Unlock()
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// Proceed to creating a bucket.
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err := objectAPI.MakeBucket(bucket)
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if err != nil {
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errorIf(err, "Unable to create a bucket.")
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writeErrorResponse(w, toAPIErrorCode(err), r.URL)
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return
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}
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// Make sure to add Location information here only for bucket
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w.Header().Set("Location", getLocation(r))
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writeSuccessResponseHeadersOnly(w)
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}
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// PostPolicyBucketHandler - POST policy
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// ----------
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// This implementation of the POST operation handles object creation with a specified
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// signature policy in multipart/form-data
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func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *http.Request) {
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objectAPI := api.ObjectAPI()
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if objectAPI == nil {
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writeErrorResponse(w, ErrServerNotInitialized, r.URL)
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return
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}
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// Require Content-Length to be set in the request
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size := r.ContentLength
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if size < 0 {
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writeErrorResponse(w, ErrMissingContentLength, r.URL)
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return
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}
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// Here the parameter is the size of the form data that should
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// be loaded in memory, the remaining being put in temporary files.
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reader, err := r.MultipartReader()
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if err != nil {
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errorIf(err, "Unable to initialize multipart reader.")
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writeErrorResponse(w, ErrMalformedPOSTRequest, r.URL)
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return
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}
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// Read multipart data and save in memory and in the disk if needed
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form, err := reader.ReadForm(maxFormMemory)
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if err != nil {
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errorIf(err, "Unable to initialize multipart reader.")
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writeErrorResponse(w, ErrMalformedPOSTRequest, r.URL)
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return
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}
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// Remove all tmp files creating during multipart upload
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defer form.RemoveAll()
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// Extract all form fields
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fileBody, fileName, fileSize, formValues, err := extractPostPolicyFormValues(form)
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if err != nil {
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errorIf(err, "Unable to parse form values.")
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writeErrorResponse(w, ErrMalformedPOSTRequest, r.URL)
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return
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}
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// Check if file is provided, error out otherwise.
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if fileBody == nil {
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writeErrorResponse(w, ErrPOSTFileRequired, r.URL)
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return
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}
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// Close multipart file
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defer fileBody.Close()
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bucket := mux.Vars(r)["bucket"]
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formValues.Set("Bucket", bucket)
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if fileName != "" && strings.Contains(formValues.Get("Key"), "${filename}") {
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// S3 feature to replace ${filename} found in Key form field
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// by the filename attribute passed in multipart
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formValues.Set("Key", strings.Replace(formValues.Get("Key"), "${filename}", fileName, -1))
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}
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object := formValues.Get("Key")
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successRedirect := formValues.Get("success_action_redirect")
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successStatus := formValues.Get("success_action_status")
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var redirectURL *url.URL
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if successRedirect != "" {
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redirectURL, err = url.Parse(successRedirect)
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if err != nil {
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writeErrorResponse(w, ErrMalformedPOSTRequest, r.URL)
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return
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}
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}
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// Verify policy signature.
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apiErr := doesPolicySignatureMatch(formValues)
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if apiErr != ErrNone {
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writeErrorResponse(w, apiErr, r.URL)
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return
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}
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policyBytes, err := base64.StdEncoding.DecodeString(formValues.Get("Policy"))
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if err != nil {
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writeErrorResponse(w, ErrMalformedPOSTRequest, r.URL)
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return
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}
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postPolicyForm, err := parsePostPolicyForm(string(policyBytes))
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if err != nil {
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writeErrorResponse(w, ErrMalformedPOSTRequest, r.URL)
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return
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}
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// Make sure formValues adhere to policy restrictions.
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if apiErr = checkPostPolicy(formValues, postPolicyForm); apiErr != ErrNone {
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writeErrorResponse(w, apiErr, r.URL)
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return
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}
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// Ensure that the object size is within expected range, also the file size
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// should not exceed the maximum single Put size (5 GiB)
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lengthRange := postPolicyForm.Conditions.ContentLengthRange
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if lengthRange.Valid {
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if fileSize < lengthRange.Min {
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errorIf(err, "Unable to create object.")
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writeErrorResponse(w, toAPIErrorCode(errDataTooSmall), r.URL)
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return
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}
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if fileSize > lengthRange.Max || isMaxObjectSize(fileSize) {
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errorIf(err, "Unable to create object.")
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writeErrorResponse(w, toAPIErrorCode(errDataTooLarge), r.URL)
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return
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}
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}
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// Extract metadata to be saved from received Form.
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metadata := extractMetadataFromForm(formValues)
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sha256sum := ""
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objectLock := globalNSMutex.NewNSLock(bucket, object)
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objectLock.Lock()
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defer objectLock.Unlock()
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objInfo, err := objectAPI.PutObject(bucket, object, fileSize, fileBody, metadata, sha256sum)
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if err != nil {
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errorIf(err, "Unable to create object.")
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writeErrorResponse(w, toAPIErrorCode(err), r.URL)
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return
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}
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w.Header().Set("ETag", `"`+objInfo.MD5Sum+`"`)
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w.Header().Set("Location", getObjectLocation(bucket, object))
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// Notify object created event.
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defer eventNotify(eventData{
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Type: ObjectCreatedPost,
|
|
Bucket: objInfo.Bucket,
|
|
ObjInfo: objInfo,
|
|
ReqParams: extractReqParams(r),
|
|
})
|
|
|
|
if successRedirect != "" {
|
|
// Replace raw query params..
|
|
redirectURL.RawQuery = getRedirectPostRawQuery(objInfo)
|
|
writeRedirectSeeOther(w, redirectURL.String())
|
|
return
|
|
}
|
|
|
|
// Decide what http response to send depending on success_action_status parameter
|
|
switch successStatus {
|
|
case "201":
|
|
resp := encodeResponse(PostResponse{
|
|
Bucket: objInfo.Bucket,
|
|
Key: objInfo.Name,
|
|
ETag: `"` + objInfo.MD5Sum + `"`,
|
|
Location: getObjectLocation(objInfo.Bucket, objInfo.Name),
|
|
})
|
|
writeResponse(w, http.StatusCreated, resp, "application/xml")
|
|
case "200":
|
|
writeSuccessResponseHeadersOnly(w)
|
|
default:
|
|
writeSuccessNoContent(w)
|
|
}
|
|
}
|
|
|
|
// 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"]
|
|
|
|
objectAPI := api.ObjectAPI()
|
|
if objectAPI == nil {
|
|
writeErrorResponseHeadersOnly(w, ErrServerNotInitialized)
|
|
return
|
|
}
|
|
|
|
if s3Error := checkRequestAuthType(r, bucket, "s3:ListBucket", serverConfig.GetRegion()); s3Error != ErrNone {
|
|
writeErrorResponseHeadersOnly(w, s3Error)
|
|
return
|
|
}
|
|
|
|
bucketLock := globalNSMutex.NewNSLock(bucket, "")
|
|
bucketLock.RLock()
|
|
defer bucketLock.RUnlock()
|
|
|
|
if _, err := objectAPI.GetBucketInfo(bucket); err != nil {
|
|
errorIf(err, "Unable to fetch bucket info.")
|
|
writeErrorResponseHeadersOnly(w, toAPIErrorCode(err))
|
|
return
|
|
}
|
|
|
|
writeSuccessResponseHeadersOnly(w)
|
|
}
|
|
|
|
// DeleteBucketHandler - Delete bucket
|
|
func (api objectAPIHandlers) DeleteBucketHandler(w http.ResponseWriter, r *http.Request) {
|
|
objectAPI := api.ObjectAPI()
|
|
if objectAPI == nil {
|
|
writeErrorResponse(w, ErrServerNotInitialized, r.URL)
|
|
return
|
|
}
|
|
|
|
// DeleteBucket does not have any bucket action.
|
|
if s3Error := checkRequestAuthType(r, "", "", serverConfig.GetRegion()); s3Error != ErrNone {
|
|
writeErrorResponse(w, s3Error, r.URL)
|
|
return
|
|
}
|
|
|
|
vars := mux.Vars(r)
|
|
bucket := vars["bucket"]
|
|
|
|
bucketLock := globalNSMutex.NewNSLock(bucket, "")
|
|
bucketLock.Lock()
|
|
defer bucketLock.Unlock()
|
|
|
|
// Attempt to delete bucket.
|
|
if err := objectAPI.DeleteBucket(bucket); err != nil {
|
|
errorIf(err, "Unable to delete a bucket.")
|
|
writeErrorResponse(w, toAPIErrorCode(err), r.URL)
|
|
return
|
|
}
|
|
|
|
// Delete bucket access policy, if present - ignore any errors.
|
|
_ = removeBucketPolicy(bucket, objectAPI)
|
|
|
|
// Delete notification config, if present - ignore any errors.
|
|
_ = removeNotificationConfig(bucket, objectAPI)
|
|
|
|
// Delete listener config, if present - ignore any errors.
|
|
_ = removeListenerConfig(bucket, objectAPI)
|
|
|
|
// Write success response.
|
|
writeSuccessNoContent(w)
|
|
}
|