355 lines
10 KiB
Go
355 lines
10 KiB
Go
/*
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* Minio Go Library for Amazon S3 Compatible Cloud Storage
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* (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 minio
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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/json"
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"encoding/xml"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"path"
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"github.com/minio/minio-go/pkg/credentials"
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"github.com/minio/minio-go/pkg/policy"
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"github.com/minio/minio-go/pkg/s3signer"
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)
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/// Bucket operations
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// MakeBucket creates a new bucket with bucketName.
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//
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// Location is an optional argument, by default all buckets are
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// created in US Standard Region.
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//
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// For Amazon S3 for more supported regions - http://docs.aws.amazon.com/general/latest/gr/rande.html
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// For Google Cloud Storage for more supported regions - https://cloud.google.com/storage/docs/bucket-locations
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func (c Client) MakeBucket(bucketName string, location string) (err error) {
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defer func() {
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// Save the location into cache on a successful makeBucket response.
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if err == nil {
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c.bucketLocCache.Set(bucketName, location)
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}
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}()
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// Validate the input arguments.
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if err := isValidBucketName(bucketName); err != nil {
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return err
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}
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// If location is empty, treat is a default region 'us-east-1'.
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if location == "" {
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location = "us-east-1"
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}
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// Try creating bucket with the provided region, in case of
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// invalid region error let's guess the appropriate region
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// from S3 API headers
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// Create a done channel to control 'newRetryTimer' go routine.
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doneCh := make(chan struct{}, 1)
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// Indicate to our routine to exit cleanly upon return.
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defer close(doneCh)
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// Blank indentifier is kept here on purpose since 'range' without
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// blank identifiers is only supported since go1.4
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// https://golang.org/doc/go1.4#forrange.
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for _ = range c.newRetryTimer(MaxRetry, DefaultRetryUnit, DefaultRetryCap, MaxJitter, doneCh) {
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// Initialize the makeBucket request.
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req, err := c.makeBucketRequest(bucketName, location)
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if err != nil {
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return err
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}
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// Execute make bucket request.
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resp, err := c.do(req)
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defer closeResponse(resp)
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if err != nil {
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return err
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}
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if resp.StatusCode != http.StatusOK {
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err := httpRespToErrorResponse(resp, bucketName, "")
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errResp := ToErrorResponse(err)
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if resp.StatusCode == http.StatusBadRequest && errResp.Region != "" {
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// Fetch bucket region found in headers
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// of S3 error response, attempt bucket
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// create again.
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location = errResp.Region
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continue
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}
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// Nothing to retry, fail.
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return err
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}
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// Control reaches here when bucket create was successful,
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// break out.
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break
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}
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// Success.
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return nil
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}
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// Low level wrapper API For makeBucketRequest.
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func (c Client) makeBucketRequest(bucketName string, location string) (*http.Request, error) {
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// Validate input arguments.
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if err := isValidBucketName(bucketName); err != nil {
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return nil, err
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}
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// In case of Amazon S3. The make bucket issued on
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// already existing bucket would fail with
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// 'AuthorizationMalformed' error if virtual style is
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// used. So we default to 'path style' as that is the
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// preferred method here. The final location of the
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// 'bucket' is provided through XML LocationConstraint
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// data with the request.
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targetURL := c.endpointURL
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targetURL.Path = path.Join(bucketName, "") + "/"
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// get a new HTTP request for the method.
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req, err := http.NewRequest("PUT", targetURL.String(), nil)
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if err != nil {
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return nil, err
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}
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// set UserAgent for the request.
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c.setUserAgent(req)
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// Get credentials from the configured credentials provider.
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value, err := c.credsProvider.Get()
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if err != nil {
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return nil, err
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}
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var (
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signerType = value.SignerType
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accessKeyID = value.AccessKeyID
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secretAccessKey = value.SecretAccessKey
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sessionToken = value.SessionToken
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)
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// Custom signer set then override the behavior.
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if c.overrideSignerType != credentials.SignatureDefault {
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signerType = c.overrideSignerType
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}
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// If signerType returned by credentials helper is anonymous,
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// then do not sign regardless of signerType override.
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if value.SignerType == credentials.SignatureAnonymous {
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signerType = credentials.SignatureAnonymous
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}
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// set sha256 sum for signature calculation only with signature version '4'.
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if signerType.IsV4() {
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req.Header.Set("X-Amz-Content-Sha256", hex.EncodeToString(sum256([]byte{})))
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}
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// If location is not 'us-east-1' create bucket location config.
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if location != "us-east-1" && location != "" {
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createBucketConfig := createBucketConfiguration{}
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createBucketConfig.Location = location
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var createBucketConfigBytes []byte
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createBucketConfigBytes, err = xml.Marshal(createBucketConfig)
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if err != nil {
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return nil, err
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}
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createBucketConfigBuffer := bytes.NewBuffer(createBucketConfigBytes)
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req.Body = ioutil.NopCloser(createBucketConfigBuffer)
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req.ContentLength = int64(len(createBucketConfigBytes))
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// Set content-md5.
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req.Header.Set("Content-Md5", base64.StdEncoding.EncodeToString(sumMD5(createBucketConfigBytes)))
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if signerType.IsV4() {
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// Set sha256.
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req.Header.Set("X-Amz-Content-Sha256", hex.EncodeToString(sum256(createBucketConfigBytes)))
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}
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}
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// Sign the request.
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if signerType.IsV4() {
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// Signature calculated for MakeBucket request should be for 'us-east-1',
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// regardless of the bucket's location constraint.
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req = s3signer.SignV4(*req, accessKeyID, secretAccessKey, sessionToken, "us-east-1")
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} else if signerType.IsV2() {
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req = s3signer.SignV2(*req, accessKeyID, secretAccessKey)
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}
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// Return signed request.
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return req, nil
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}
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// SetBucketPolicy set the access permissions on an existing bucket.
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//
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// For example
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//
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// none - owner gets full access [default].
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// readonly - anonymous get access for everyone at a given object prefix.
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// readwrite - anonymous list/put/delete access to a given object prefix.
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// writeonly - anonymous put/delete access to a given object prefix.
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func (c Client) SetBucketPolicy(bucketName string, objectPrefix string, bucketPolicy policy.BucketPolicy) error {
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// Input validation.
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if err := isValidBucketName(bucketName); err != nil {
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return err
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}
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if err := isValidObjectPrefix(objectPrefix); err != nil {
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return err
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}
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if !bucketPolicy.IsValidBucketPolicy() {
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return ErrInvalidArgument(fmt.Sprintf("Invalid bucket policy provided. %s", bucketPolicy))
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}
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policyInfo, err := c.getBucketPolicy(bucketName)
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errResponse := ToErrorResponse(err)
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if err != nil && errResponse.Code != "NoSuchBucketPolicy" {
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return err
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}
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if bucketPolicy == policy.BucketPolicyNone && policyInfo.Statements == nil {
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// As the request is for removing policy and the bucket
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// has empty policy statements, just return success.
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return nil
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}
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policyInfo.Statements = policy.SetPolicy(policyInfo.Statements, bucketPolicy, bucketName, objectPrefix)
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// Save the updated policies.
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return c.putBucketPolicy(bucketName, policyInfo)
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}
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// Saves a new bucket policy.
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func (c Client) putBucketPolicy(bucketName string, policyInfo policy.BucketAccessPolicy) error {
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// Input validation.
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if err := isValidBucketName(bucketName); err != nil {
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return err
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}
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// If there are no policy statements, we should remove entire policy.
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if len(policyInfo.Statements) == 0 {
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return c.removeBucketPolicy(bucketName)
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}
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// Get resources properly escaped and lined up before
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// using them in http request.
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urlValues := make(url.Values)
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urlValues.Set("policy", "")
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policyBytes, err := json.Marshal(&policyInfo)
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if err != nil {
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return err
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}
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policyBuffer := bytes.NewReader(policyBytes)
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reqMetadata := requestMetadata{
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bucketName: bucketName,
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queryValues: urlValues,
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contentBody: policyBuffer,
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contentLength: int64(len(policyBytes)),
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contentMD5Bytes: sumMD5(policyBytes),
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contentSHA256Bytes: sum256(policyBytes),
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}
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// Execute PUT to upload a new bucket policy.
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resp, err := c.executeMethod("PUT", reqMetadata)
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defer closeResponse(resp)
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if err != nil {
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return err
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}
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if resp != nil {
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if resp.StatusCode != http.StatusNoContent {
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return httpRespToErrorResponse(resp, bucketName, "")
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}
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}
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return nil
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}
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// Removes all policies on a bucket.
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func (c Client) removeBucketPolicy(bucketName string) error {
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// Input validation.
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if err := isValidBucketName(bucketName); err != nil {
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return err
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}
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// Get resources properly escaped and lined up before
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// using them in http request.
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urlValues := make(url.Values)
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urlValues.Set("policy", "")
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// Execute DELETE on objectName.
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resp, err := c.executeMethod("DELETE", requestMetadata{
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bucketName: bucketName,
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queryValues: urlValues,
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contentSHA256Bytes: emptySHA256,
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})
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defer closeResponse(resp)
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if err != nil {
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return err
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}
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return nil
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}
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// SetBucketNotification saves a new bucket notification.
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func (c Client) SetBucketNotification(bucketName string, bucketNotification BucketNotification) error {
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// Input validation.
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if err := isValidBucketName(bucketName); err != nil {
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return err
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}
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// Get resources properly escaped and lined up before
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// using them in http request.
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urlValues := make(url.Values)
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urlValues.Set("notification", "")
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notifBytes, err := xml.Marshal(bucketNotification)
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if err != nil {
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return err
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}
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notifBuffer := bytes.NewReader(notifBytes)
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reqMetadata := requestMetadata{
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bucketName: bucketName,
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queryValues: urlValues,
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contentBody: notifBuffer,
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contentLength: int64(len(notifBytes)),
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contentMD5Bytes: sumMD5(notifBytes),
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contentSHA256Bytes: sum256(notifBytes),
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}
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// Execute PUT to upload a new bucket notification.
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resp, err := c.executeMethod("PUT", reqMetadata)
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defer closeResponse(resp)
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if err != nil {
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return err
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}
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if resp != nil {
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if resp.StatusCode != http.StatusOK {
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return httpRespToErrorResponse(resp, bucketName, "")
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}
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}
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return nil
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}
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// RemoveAllBucketNotification - Remove bucket notification clears all previously specified config
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func (c Client) RemoveAllBucketNotification(bucketName string) error {
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return c.SetBucketNotification(bucketName, BucketNotification{})
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}
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