Add Fuzzit integration

Add a basic fuzz test for the httprule package, run regression tests
locally on every PR and continuous fuzzing on fuzzit.dev.

.circleci/config.yml

@@ -48,6 +48,14 @@ jobs:
       - checkout
       - run: go get golang.org/x/lint/golint
       - run: make lint
+  fuzzit:
+    docker:
+      - image: fuzzitdev/golang:1.12.7-buster
+    working_directory: /go/src/github.com/grpc-gateway/grpc-gateway
+    steps:
+      - checkout
+      - setup_remote_docker
+      - run: ./fuzzit.sh
   bazel:
     docker:
       - image: l.gcr.io/google/bazel:latest
@@ -88,6 +96,7 @@ workflows:
     jobs:
       - build
       - test
+      - fuzzit
       - node_test
       - generate
       - lint

README.md

@@ -1,6 +1,6 @@
 # grpc-gateway
 
-[![release](https://img.shields.io/github/release/grpc-ecosystem/grpc-gateway.svg?style=flat-square)](https://github.com/grpc-ecosystem/grpc-gateway/releases) [![CircleCI](https://img.shields.io/circleci/project/github/grpc-ecosystem/grpc-gateway/master.svg?style=flat-square)](https://circleci.com/gh/grpc-ecosystem/grpc-gateway) [![coverage](https://img.shields.io/codecov/c/github/grpc-ecosystem/grpc-gateway/master.svg?style=flat-square)](https://codecov.io/gh/grpc-ecosystem/grpc-gateway) [![license](https://img.shields.io/github/license/grpc-ecosystem/grpc-gateway.svg?style=flat-square)](LICENSE.txt)
+[![release](https://img.shields.io/github/release/grpc-ecosystem/grpc-gateway.svg?style=flat-square)](https://github.com/grpc-ecosystem/grpc-gateway/releases) [![CircleCI](https://img.shields.io/circleci/project/github/grpc-ecosystem/grpc-gateway/master.svg?style=flat-square)](https://circleci.com/gh/grpc-ecosystem/grpc-gateway) [![fuzzit](https://app.fuzzit.dev/badge?org_id=grpc-gateway)](https://app.fuzzit.dev/orgs/grpc-gateway/dashboard) [![coverage](https://img.shields.io/codecov/c/github/grpc-ecosystem/grpc-gateway/master.svg?style=flat-square)](https://codecov.io/gh/grpc-ecosystem/grpc-gateway) [![license](https://img.shields.io/github/license/grpc-ecosystem/grpc-gateway.svg?style=flat-square)](LICENSE.txt)
 
 The grpc-gateway is a plugin of the Google protocol buffers compiler
 [protoc](https://github.com/protocolbuffers/protobuf).

protoc-gen-grpc-gateway/httprule/fuzz.go

@@ -0,0 +1,11 @@
+// +build gofuzz
+
+package httprule
+
+func Fuzz(data []byte) int {
+	_, err := Parse(string(data))
+	if err != nil {
+		return 0
+	}
+	return 0
+}