* * Copyright 2018 gRPC authors. * * 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. * 

package grpcutil

import (
	
	
)
ParseMethod splits service and method from the input. It expects format "/service/method".
func ( string) (,  string,  error) {
	if !strings.HasPrefix(, "/") {
		return "", "", errors.New("invalid method name: should start with /")
	}
	 = [1:]

	 := strings.LastIndex(, "/")
	if  < 0 {
		return "", "", errors.New("invalid method name: suffix /method is missing")
	}
	return [:], [+1:], nil
}

const baseContentType = "application/grpc"
ContentSubtype returns the content-subtype for the given content-type. The given content-type must be a valid content-type that starts with "application/grpc". A content-subtype will follow "application/grpc" after a "+" or ";". See https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#requests for more details. If contentType is not a valid content-type for gRPC, the boolean will be false, otherwise true. If content-type == "application/grpc", "application/grpc+", or "application/grpc;", the boolean will be true, but no content-subtype will be returned. contentType is assumed to be lowercase already.
func ( string) (string, bool) {
	if  == baseContentType {
		return "", true
	}
	if !strings.HasPrefix(, baseContentType) {
		return "", false
guaranteed since != baseContentType and has baseContentType prefix
	switch [len(baseContentType)] {
this will return true for "application/grpc+" or "application/grpc;" which the previous validContentType function tested to be valid, so we just say that no content-subtype is specified in this case
		return [len(baseContentType)+1:], true
	default:
		return "", false
	}
}
ContentType builds full content type with the given sub-type. contentSubtype is assumed to be lowercase
func ( string) string {
	if  == "" {
		return baseContentType
	}
	return baseContentType + "+" +