mirror of
https://github.com/octoleo/restic.git
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214 lines
6.8 KiB
Go
214 lines
6.8 KiB
Go
/*
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* Minio Go Library for Amazon S3 Compatible Cloud Storage
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* Copyright 2015-2017 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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"errors"
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"net/http"
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"net/url"
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"time"
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"github.com/minio/minio-go/pkg/s3signer"
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"github.com/minio/minio-go/pkg/s3utils"
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)
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// presignURL - Returns a presigned URL for an input 'method'.
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// Expires maximum is 7days - ie. 604800 and minimum is 1.
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func (c Client) presignURL(method string, bucketName string, objectName string, expires time.Duration, reqParams url.Values) (u *url.URL, err error) {
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// Input validation.
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if method == "" {
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return nil, ErrInvalidArgument("method cannot be empty.")
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}
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if err = s3utils.CheckValidBucketName(bucketName); err != nil {
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return nil, err
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}
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if err = isValidExpiry(expires); err != nil {
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return nil, err
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}
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// Convert expires into seconds.
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expireSeconds := int64(expires / time.Second)
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reqMetadata := requestMetadata{
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presignURL: true,
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bucketName: bucketName,
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objectName: objectName,
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expires: expireSeconds,
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queryValues: reqParams,
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}
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// Instantiate a new request.
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// Since expires is set newRequest will presign the request.
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var req *http.Request
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if req, err = c.newRequest(method, reqMetadata); err != nil {
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return nil, err
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}
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return req.URL, nil
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}
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// PresignedGetObject - Returns a presigned URL to access an object
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// data without credentials. URL can have a maximum expiry of
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// upto 7days or a minimum of 1sec. Additionally you can override
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// a set of response headers using the query parameters.
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func (c Client) PresignedGetObject(bucketName string, objectName string, expires time.Duration, reqParams url.Values) (u *url.URL, err error) {
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if err = s3utils.CheckValidObjectName(objectName); err != nil {
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return nil, err
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}
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return c.presignURL("GET", bucketName, objectName, expires, reqParams)
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}
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// PresignedHeadObject - Returns a presigned URL to access object
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// metadata without credentials. URL can have a maximum expiry of
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// upto 7days or a minimum of 1sec. Additionally you can override
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// a set of response headers using the query parameters.
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func (c Client) PresignedHeadObject(bucketName string, objectName string, expires time.Duration, reqParams url.Values) (u *url.URL, err error) {
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if err = s3utils.CheckValidObjectName(objectName); err != nil {
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return nil, err
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}
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return c.presignURL("HEAD", bucketName, objectName, expires, reqParams)
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}
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// PresignedPutObject - Returns a presigned URL to upload an object
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// without credentials. URL can have a maximum expiry of upto 7days
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// or a minimum of 1sec.
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func (c Client) PresignedPutObject(bucketName string, objectName string, expires time.Duration) (u *url.URL, err error) {
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if err = s3utils.CheckValidObjectName(objectName); err != nil {
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return nil, err
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}
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return c.presignURL("PUT", bucketName, objectName, expires, nil)
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}
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// Presign - returns a presigned URL for any http method of your choice
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// along with custom request params. URL can have a maximum expiry of
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// upto 7days or a minimum of 1sec.
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func (c Client) Presign(method string, bucketName string, objectName string, expires time.Duration, reqParams url.Values) (u *url.URL, err error) {
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return c.presignURL(method, bucketName, objectName, expires, reqParams)
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}
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// PresignedPostPolicy - Returns POST urlString, form data to upload an object.
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func (c Client) PresignedPostPolicy(p *PostPolicy) (u *url.URL, formData map[string]string, err error) {
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// Validate input arguments.
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if p.expiration.IsZero() {
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return nil, nil, errors.New("Expiration time must be specified")
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}
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if _, ok := p.formData["key"]; !ok {
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return nil, nil, errors.New("object key must be specified")
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}
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if _, ok := p.formData["bucket"]; !ok {
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return nil, nil, errors.New("bucket name must be specified")
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}
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bucketName := p.formData["bucket"]
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// Fetch the bucket location.
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location, err := c.getBucketLocation(bucketName)
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if err != nil {
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return nil, nil, err
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}
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u, err = c.makeTargetURL(bucketName, "", location, nil)
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if err != nil {
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return nil, nil, err
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}
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// Get credentials from the configured credentials provider.
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credValues, err := c.credsProvider.Get()
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if err != nil {
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return nil, nil, err
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}
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var (
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signerType = credValues.SignerType
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sessionToken = credValues.SessionToken
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accessKeyID = credValues.AccessKeyID
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secretAccessKey = credValues.SecretAccessKey
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)
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if signerType.IsAnonymous() {
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return nil, nil, ErrInvalidArgument("Presigned operations are not supported for anonymous credentials")
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}
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// Keep time.
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t := time.Now().UTC()
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// For signature version '2' handle here.
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if signerType.IsV2() {
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policyBase64 := p.base64()
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p.formData["policy"] = policyBase64
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// For Google endpoint set this value to be 'GoogleAccessId'.
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if s3utils.IsGoogleEndpoint(c.endpointURL) {
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p.formData["GoogleAccessId"] = accessKeyID
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} else {
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// For all other endpoints set this value to be 'AWSAccessKeyId'.
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p.formData["AWSAccessKeyId"] = accessKeyID
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}
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// Sign the policy.
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p.formData["signature"] = s3signer.PostPresignSignatureV2(policyBase64, secretAccessKey)
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return u, p.formData, nil
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}
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// Add date policy.
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if err = p.addNewPolicy(policyCondition{
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matchType: "eq",
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condition: "$x-amz-date",
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value: t.Format(iso8601DateFormat),
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}); err != nil {
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return nil, nil, err
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}
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// Add algorithm policy.
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if err = p.addNewPolicy(policyCondition{
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matchType: "eq",
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condition: "$x-amz-algorithm",
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value: signV4Algorithm,
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}); err != nil {
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return nil, nil, err
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}
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// Add a credential policy.
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credential := s3signer.GetCredential(accessKeyID, location, t)
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if err = p.addNewPolicy(policyCondition{
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matchType: "eq",
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condition: "$x-amz-credential",
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value: credential,
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}); err != nil {
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return nil, nil, err
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}
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if sessionToken != "" {
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if err = p.addNewPolicy(policyCondition{
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matchType: "eq",
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condition: "$x-amz-security-token",
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value: sessionToken,
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}); err != nil {
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return nil, nil, err
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}
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}
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// Get base64 encoded policy.
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policyBase64 := p.base64()
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// Fill in the form data.
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p.formData["policy"] = policyBase64
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p.formData["x-amz-algorithm"] = signV4Algorithm
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p.formData["x-amz-credential"] = credential
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p.formData["x-amz-date"] = t.Format(iso8601DateFormat)
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if sessionToken != "" {
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p.formData["x-amz-security-token"] = sessionToken
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}
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p.formData["x-amz-signature"] = s3signer.PostPresignSignatureV4(policyBase64, t, secretAccessKey, location)
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return u, p.formData, nil
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}
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