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