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