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token.go
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token.go
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//
// DISCLAIMER
//
// Copyright 2020 ArangoDB GmbH, Cologne, Germany
//
// 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.
//
// Copyright holder is ArangoDB GmbH, Cologne, Germany
//
// Author Ewout Prangsma
//
package auth
import (
"context"
"strings"
"google.golang.org/grpc/metadata"
)
const (
bearerPrefix = "bearer "
)
// GetAccessToken fetches the access token from the given (GRPC) context.
// If no such token is found, false is returned.
func GetAccessToken(ctx context.Context) (string, bool) {
md, ok := metadata.FromIncomingContext(ctx)
if !ok {
return "", false
}
auth := md.Get("Authorization")
if len(auth) == 0 {
return "", false
}
for _, token := range auth {
if strings.HasPrefix(strings.ToLower(token), bearerPrefix) {
result := strings.TrimSpace(token[len(bearerPrefix):])
return result, true
}
}
return "", false
}
// WithAccessToken returns a context that containes the given access token
// for outgoing (GRPC) calls and is derived from the given context.WithAccessToken
func WithAccessToken(ctx context.Context, token string) context.Context {
if token == "" {
return ctx
}
return metadata.AppendToOutgoingContext(ctx, "Authorization", bearerPrefix+token)
}