70 lines
2.2 KiB
Go
70 lines
2.2 KiB
Go
package autorest
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// Copyright 2017 Microsoft Corporation
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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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import (
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"fmt"
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"net/http"
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"strings"
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)
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// SASTokenAuthorizer implements an authorization for SAS Token Authentication
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// this can be used for interaction with Blob Storage Endpoints
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type SASTokenAuthorizer struct {
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sasToken string
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}
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// NewSASTokenAuthorizer creates a SASTokenAuthorizer using the given credentials
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func NewSASTokenAuthorizer(sasToken string) (*SASTokenAuthorizer, error) {
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if strings.TrimSpace(sasToken) == "" {
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return nil, fmt.Errorf("sasToken cannot be empty")
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}
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token := sasToken
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if strings.HasPrefix(sasToken, "?") {
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token = strings.TrimPrefix(sasToken, "?")
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}
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return &SASTokenAuthorizer{
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sasToken: token,
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}, nil
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}
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// WithAuthorization returns a PrepareDecorator that adds a shared access signature token to the
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// URI's query parameters. This can be used for the Blob, Queue, and File Services.
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//
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// See https://docs.microsoft.com/en-us/rest/api/storageservices/delegate-access-with-shared-access-signature
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func (sas *SASTokenAuthorizer) WithAuthorization() PrepareDecorator {
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return func(p Preparer) Preparer {
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return PreparerFunc(func(r *http.Request) (*http.Request, error) {
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r, err := p.Prepare(r)
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if err != nil {
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return r, err
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}
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if r.URL.RawQuery != "" {
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// When retrying the request we need to ensure the sasToken isn't present
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if !strings.Contains(r.URL.RawQuery, sas.sasToken) {
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r.URL.RawQuery = fmt.Sprintf("%s&%s", r.URL.RawQuery, sas.sasToken)
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}
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} else {
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r.URL.RawQuery = sas.sasToken
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}
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return Prepare(r)
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})
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}
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}
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