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ghooks.go
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package ghooks
import (
"bytes"
"crypto/hmac"
"crypto/sha1"
"encoding/hex"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strings"
)
const (
VERSION = 0.2
)
type Server struct {
Port int
Secret string
Host string
}
type Hook struct {
Event string
Func func(payload interface{})
}
type Hooks struct {
Hooks []Hook
}
var hooks Hooks
func (s *Server) On(name string, handler func(payload interface{})) {
hooks.Hooks = append(hooks.Hooks, Hook{Event: name, Func: handler})
}
func Emit(name string, payload interface{}) {
for _, v := range hooks.Hooks {
if strings.EqualFold(v.Event, name) {
v.Func(payload)
}
}
}
func NewServer(port int, hosts ...string) *Server {
host := "0.0.0.0"
if len(hosts) > 0 && hosts[0] != "" {
host = hosts[0]
}
return &Server{Port: port, Host: host}
}
func (s *Server) Run() error {
fmt.Printf("ghooks server start %s:%d \n", s.Host, s.Port)
http.HandleFunc("/", s.Receiver)
return http.ListenAndServe(fmt.Sprintf("%s:%d", s.Host, s.Port), nil)
}
func (s *Server) Receiver(w http.ResponseWriter, req *http.Request) {
if req.Method == "GET" {
http.Error(w, "Method Not Allowd", http.StatusMethodNotAllowed)
return
}
event := req.Header.Get("X-GitHub-Event")
if event == "" {
http.Error(w, "Bad Request", http.StatusBadRequest)
return
}
if req.Body == nil {
http.Error(w, "Bad Request", http.StatusBadRequest)
return
}
defer req.Body.Close()
body, err := ioutil.ReadAll(req.Body)
if err != nil {
http.Error(w, "Bad Request", http.StatusBadRequest)
return
}
if s.Secret != "" {
signature := req.Header.Get("X-Hub-Signature")
if !s.isValidSignature(body, signature) {
http.Error(w, "Bad Request", http.StatusBadRequest)
return
}
}
var payload interface{}
var decoder *json.Decoder
if strings.Contains(req.Header.Get("Content-Type"), "application/json") {
decoder = json.NewDecoder(bytes.NewReader(body))
} else if strings.Contains(req.Header.Get("Content-Type"), "application/x-www-form-urlencoded") {
v, err := url.ParseQuery(string(body))
if err != nil {
http.Error(w, "Bad Request", http.StatusBadRequest)
return
}
p := v.Get("payload")
decoder = json.NewDecoder(strings.NewReader(p))
}
if err := decoder.Decode(&payload); err != nil {
http.Error(w, "Bad Request", http.StatusBadRequest)
return
}
Emit(event, payload)
w.WriteHeader(http.StatusOK)
}
func (s *Server) isValidSignature(body []byte, signature string) bool {
if !strings.HasPrefix(signature, "sha1=") {
return false
}
mac := hmac.New(sha1.New, []byte(s.Secret))
mac.Write(body)
actual := mac.Sum(nil)
expected, err := hex.DecodeString(signature[5:])
if err != nil {
return false
}
return hmac.Equal(actual, expected)
}