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minio/bucket-handlers.go

455 lines
14 KiB

/*
* Minio Cloud Storage, (C) 2015, 2016 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 main
import (
"encoding/xml"
"io"
"net/http"
"net/url"
"path"
"strings"
mux "github.com/gorilla/mux"
)
// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
func enforceBucketPolicy(api objectAPIHandlers, action string, bucket string, reqURL *url.URL) (s3Error APIErrorCode) {
// Read saved bucket policy.
policy, err := readBucketPolicy(api, bucket)
if err != nil {
errorIf(err, "Unable read bucket policy.")
switch err.(type) {
case BucketNotFound:
return ErrNoSuchBucket
case BucketNameInvalid:
return ErrInvalidBucketName
default:
// For any other error just return AccessDenied.
return ErrAccessDenied
}
}
// Parse the saved policy.
bucketPolicy, err := parseBucketPolicy(policy)
if err != nil {
errorIf(err, "Unable to parse bucket policy.")
return ErrAccessDenied
}
// Construct resource in 'arn:aws:s3:::examplebucket/object' format.
resource := AWSResourcePrefix + strings.TrimPrefix(reqURL.Path, "/")
// Get conditions for policy verification.
conditions := make(map[string]string)
for queryParam := range reqURL.Query() {
conditions[queryParam] = reqURL.Query().Get(queryParam)
}
// Validate action, resource and conditions with current policy statements.
if !bucketPolicyEvalStatements(action, resource, conditions, bucketPolicy.Statements) {
return ErrAccessDenied
}
return ErrNone
}
// GetBucketLocationHandler - GET Bucket location.
// -------------------------
// This operation returns bucket location.
func (api objectAPIHandlers) GetBucketLocationHandler(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(api, "s3:GetBucketLocation", bucket, r.URL); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
case authTypeSigned, authTypePresigned:
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
}
// Generate response.
encodedSuccessResponse := encodeResponse(LocationResponse{})
// Get current region.
region := serverConfig.GetRegion()
if region != "us-east-1" {
encodedSuccessResponse = encodeResponse(LocationResponse{
Location: region,
})
}
setCommonHeaders(w) // Write headers.
writeSuccessResponse(w, encodedSuccessResponse)
}
// ListMultipartUploadsHandler - GET Bucket (List Multipart uploads)
// -------------------------
// This operation lists in-progress multipart uploads. An in-progress
// multipart upload is a multipart upload that has been initiated,
// using the Initiate Multipart Upload request, but has not yet been
// completed or aborted. This operation returns at most 1,000 multipart
// uploads in the response.
//
func (api objectAPIHandlers) ListMultipartUploadsHandler(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/mpuAndPermissions.html
if s3Error := enforceBucketPolicy(api, "s3:ListBucketMultipartUploads", 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
}
}
prefix, keyMarker, uploadIDMarker, delimiter, maxUploads, _ := getBucketMultipartResources(r.URL.Query())
if maxUploads < 0 {
writeErrorResponse(w, r, ErrInvalidMaxUploads, r.URL.Path)
return
}
if keyMarker != "" {
// Marker not common with prefix is not implemented.
if !strings.HasPrefix(keyMarker, prefix) {
writeErrorResponse(w, r, ErrNotImplemented, r.URL.Path)
return
}
}
listMultipartsInfo, err := api.ObjectAPI.ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter, maxUploads)
if err != nil {
errorIf(err, "Unable to list multipart uploads.")
writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
return
}
// generate response
response := generateListMultipartUploadsResponse(bucket, listMultipartsInfo)
encodedSuccessResponse := encodeResponse(response)
// write headers.
setCommonHeaders(w)
// write success response.
writeSuccessResponse(w, encodedSuccessResponse)
}
// ListBucketsHandler - GET Service
// -----------
// This implementation of the GET operation returns a list of all buckets
// owned by the authenticated sender of the request.
func (api objectAPIHandlers) ListBucketsHandler(w http.ResponseWriter, r *http.Request) {
// List buckets does not support bucket policies, no need to enforce it.
if s3Error := checkAuth(r); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
bucketsInfo, err := api.ObjectAPI.ListBuckets()
if err != nil {
errorIf(err, "Unable to list buckets.")
writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
return
}
// Generate response.
response := generateListBucketsResponse(bucketsInfo)
encodedSuccessResponse := encodeResponse(response)
// Write headers.
setCommonHeaders(w)
// Write response.
writeSuccessResponse(w, encodedSuccessResponse)
}
// DeleteMultipleObjectsHandler - deletes multiple objects.
func (api objectAPIHandlers) DeleteMultipleObjectsHandler(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(api, "s3:DeleteObject", 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
}
}
// Content-Length is required and should be non-zero
// http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html
if r.ContentLength <= 0 {
writeErrorResponse(w, r, ErrMissingContentLength, r.URL.Path)
return
}
// Content-Md5 is requied should be set
// http://docs.aws.amazon.com/AmazonS3/latest/API/multiobjectdeleteapi.html
if _, ok := r.Header["Content-Md5"]; !ok {
writeErrorResponse(w, r, ErrMissingContentMD5, r.URL.Path)
return
}
// Allocate incoming content length bytes.
deleteXMLBytes := make([]byte, r.ContentLength)
// Read incoming body XML bytes.
if _, err := io.ReadFull(r.Body, deleteXMLBytes); err != nil {
errorIf(err, "Unable to read HTTP body.")
writeErrorResponse(w, r, ErrInternalError, r.URL.Path)
return
}
// Unmarshal list of keys to be deleted.
deleteObjects := &DeleteObjectsRequest{}
if err := xml.Unmarshal(deleteXMLBytes, deleteObjects); err != nil {
errorIf(err, "Unable to unmarshal delete objects request XML.")
writeErrorResponse(w, r, ErrMalformedXML, r.URL.Path)
return
}
var deleteErrors []DeleteError
var deletedObjects []ObjectIdentifier
// Loop through all the objects and delete them sequentially.
for _, object := range deleteObjects.Objects {
err := api.ObjectAPI.DeleteObject(bucket, object.ObjectName)
if err == nil {
deletedObjects = append(deletedObjects, ObjectIdentifier{
ObjectName: object.ObjectName,
})
} else {
errorIf(err, "Unable to delete object.")
deleteErrors = append(deleteErrors, DeleteError{
Code: errorCodeResponse[toAPIErrorCode(err)].Code,
Message: errorCodeResponse[toAPIErrorCode(err)].Description,
Key: object.ObjectName,
})
}
}
// Generate response
response := generateMultiDeleteResponse(deleteObjects.Quiet, deletedObjects, deleteErrors)
encodedSuccessResponse := encodeResponse(response)
// Write headers
setCommonHeaders(w)
// Write success response.
writeSuccessResponse(w, encodedSuccessResponse)
}
// PutBucketHandler - PUT Bucket
// ----------
// This implementation of the PUT operation creates a new bucket for authenticated request
func (api objectAPIHandlers) PutBucketHandler(w http.ResponseWriter, r *http.Request) {
// PutBucket does not support policies, use checkAuth to validate signature.
if s3Error := checkAuth(r); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
vars := mux.Vars(r)
bucket := vars["bucket"]
// Validate if incoming location constraint is valid, reject
// requests which do not follow valid region requirements.
if s3Error := isValidLocationConstraint(r); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
}
// Proceed to creating a bucket.
err := api.ObjectAPI.MakeBucket(bucket)
if err != nil {
errorIf(err, "Unable to create a bucket.")
writeErrorResponse(w, r, toAPIErrorCode(err), r.URL.Path)
return
}
// Make sure to add Location information here only for bucket
w.Header().Set("Location", getLocation(r))
writeSuccessResponse(w, nil)
}
// 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
}
fileBody, fileName, formValues, err := extractPostPolicyFormValues(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"]
if fileName != "" && strings.Contains(object, "${filename}") {
// S3 feature to replace ${filename} found in Key form field
// by the filename attribute passed in multipart
object = strings.Replace(object, "${filename}", fileName, -1)
}
// 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)
// Fetch object info for notifications.
objInfo, err := api.ObjectAPI.GetObjectInfo(bucket, object)
if err != nil {
errorIf(err, "Unable to fetch object info for \"%s\"", path.Join(bucket, object))
return
}
if eventN.IsBucketNotificationSet(bucket) {
// Notify object created event.
eventNotify(eventData{
Type: ObjectCreatedPost,
Bucket: bucket,
ObjInfo: objInfo,
ReqParams: map[string]string{
"sourceIPAddress": r.RemoteAddr,
},
})
}
}
// 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(api, "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) {
// DeleteBucket does not support bucket policies, use checkAuth to validate signature.
if s3Error := checkAuth(r); s3Error != ErrNone {
writeErrorResponse(w, r, s3Error, r.URL.Path)
return
}
vars := mux.Vars(r)
bucket := vars["bucket"]
// Attempt to delete bucket.
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(api, bucket)
// Write success response.
writeSuccessNoContent(w)
}