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// Copyright 2016 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package grpc_auth
import (
"strings"
"github.com/grpc-ecosystem/go-grpc-middleware/util/metautils"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
var (
headerAuthorize = "authorization"
)
// AuthFromMD is a helper function for extracting the :authorization header from the gRPC metadata of the request.
//
// It expects the `:authorization` header to be of a certain scheme (e.g. `basic`, `bearer`), in a
// case-insensitive format (see rfc2617, sec 1.2). If no such authorization is found, or the token
// is of wrong scheme, an error with gRPC status `Unauthenticated` is returned.
func AuthFromMD(ctx context.Context, expectedScheme string) (string, error) {
val := metautils.ExtractIncoming(ctx).Get(headerAuthorize)
if val == "" {
return "", grpc.Errorf(codes.Unauthenticated, "Request unauthenticated with "+expectedScheme)
}
splits := strings.SplitN(val, " ", 2)
if len(splits) < 2 {
return "", grpc.Errorf(codes.Unauthenticated, "Bad authorization string")
}
if strings.ToLower(splits[0]) != strings.ToLower(expectedScheme) {
return "", grpc.Errorf(codes.Unauthenticated, "Request unauthenticated with "+expectedScheme)
}
return splits[1], nil
}
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