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authFromOutgoingMD.go
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/
authFromOutgoingMD.go
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package grpc
import (
"context"
"strings"
grpc_auth "github.com/grpc-ecosystem/go-grpc-middleware/auth"
"github.com/grpc-ecosystem/go-grpc-middleware/util/metautils"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
const (
headerAuthorize = "authorization"
)
// TokenFromOutgoingMD extracts token stored by CtxWithToken.
func TokenFromOutgoingMD(ctx context.Context) (string, error) {
expectedScheme := "bearer"
val := metautils.ExtractOutgoing(ctx).Get(headerAuthorize)
if val == "" {
return "", status.Errorf(codes.Unauthenticated, "Request unauthenticated with "+expectedScheme)
}
splits := strings.SplitN(val, " ", 2)
if len(splits) < 2 {
return "", status.Errorf(codes.Unauthenticated, "Bad authorization string")
}
if !strings.EqualFold(splits[0], strings.ToLower(expectedScheme)) {
return "", status.Errorf(codes.Unauthenticated, "Request unauthenticated with "+expectedScheme)
}
return splits[1], nil
}
// TokenFromMD is a helper function for extracting the :authorization header from the gRPC metadata of the request.
func TokenFromMD(ctx context.Context) (string, error) {
return grpc_auth.AuthFromMD(ctx, "bearer")
}
// OwnerFromOutgoingTokenMD extracts ownerClaim from token stored by CtxWithToken.
func OwnerFromOutgoingTokenMD(ctx context.Context, ownerClaim string) (string, error) {
accessToken, err := TokenFromOutgoingMD(ctx)
if err != nil {
return "", err
}
owner, err := ParseOwnerFromJwtToken(ownerClaim, accessToken)
if err != nil {
return "", ForwardFromError(codes.InvalidArgument, err)
}
return owner, err
}