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action.go
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action.go
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package hookserver
import (
"bytes"
"crypto/hmac"
"crypto/sha1"
"encoding/hex"
"errors"
"fmt"
"net/http"
// "net/http/cgi"
"os/exec"
"strings"
"syscall"
)
type Processor struct {
*HookServer
Response http.ResponseWriter
Request *http.Request
}
func (p *Processor) validateSecret(body *[]byte, secret string) error {
headers := p.Request.Header
hmacHex := headers.Get("X-Hub-Signature")
if !strings.HasPrefix(hmacHex, "sha1=") {
return fmt.Errorf("Unknown hash type: %s", hmacHex)
}
hmacSig, err := hex.DecodeString(hmacHex[5:])
if err != nil {
return err
}
mac := hmac.New(sha1.New, []byte(secret))
mac.Write(*body)
expectedMAC := mac.Sum(nil)
if !hmac.Equal(hmacSig, expectedMAC) {
return errors.New("Invalid Signature")
}
return nil
}
func (p *Processor) InternalServerError(err error) {
p.Logger.Println(err)
p.Response.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(p.Response, err.Error())
}
func (p *Processor) NotFound() {
p.Response.WriteHeader(http.StatusNotFound)
}
func (p *Processor) BadRequest(err error) {
p.Logger.Println(err)
p.Response.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(p.Response, err.Error())
}
func upperCaseAndUnderscore(r rune) rune {
switch {
case r >= 'a' && r <= 'z':
return r - ('a' - 'A')
case r == '-':
return '_'
case r == '=':
return '_'
}
// TODO: other transformations in spec or practice?
return r
}
func (h *HookServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
p := Processor{h, w, r}
eventType := r.Header.Get("X-Github-Event")
event, ok := h.EventMap[eventType]
if !ok {
p.BadRequest(fmt.Errorf("unknown event %s", eventType))
return
}
body, err := getBody(r)
if err != nil {
p.InternalServerError(err)
return
}
if secret := p.Secret; secret != "" {
if err := p.validateSecret(&body, secret); err != nil {
p.BadRequest(err)
return
}
}
payload, err := getPayloadString(r, &body)
if err != nil {
p.BadRequest(err)
return
}
val := map[string]string{
"SERVER_NAME": r.Host,
"HTTP_HOST": r.Host,
"REQUEST_METHOD": r.Method,
"QUERY_STRING": r.URL.RawQuery,
"REQUEST_URI": r.URL.RequestURI(),
"REMOTE_ADDR": r.RemoteAddr,
"REMOTE_HOST": r.RemoteAddr,
}
for k, v := range r.Header {
k = strings.Map(upperCaseAndUnderscore, k)
joinStr := ", "
if k == "COOKIE" {
joinStr = "; "
}
val["HTTP_"+k] = strings.Join(v, joinStr)
}
if err := parsePayload(val, payload, event.Values); err != nil {
p.InternalServerError(err)
return
}
bin := event.GetBinPath(val)
binPath, err := findBinPath(p.ScriptRoot, bin, p.DefaultBin)
if err != nil {
p.Logger.Printf("%s => not found", bin)
p.NotFound()
} else {
val["PATH_INFO"] = binPath
cmd := exec.Command(binPath)
//cmd.Stdin = r.Body
//cmd.Stdin = payload
cmd.Stdin = bytes.NewReader(*payload)
for k, v := range val {
cmd.Env = append(cmd.Env, k+"="+v)
}
var errorExit bool
if err := cmd.Run(); err != nil {
if e2, ok := err.(*exec.ExitError); ok {
if s, ok := e2.Sys().(syscall.WaitStatus); ok {
errorExit = s.ExitStatus() != 0
} else {
}
}
}
if errorExit {
p.Logger.Printf("ng %s => %v", binPath, err)
p.InternalServerError(fmt.Errorf("%s ERROR", bin))
} else {
p.Logger.Printf("ok %s => %s", bin, binPath)
p.Response.WriteHeader(http.StatusOK)
fmt.Fprintf(p.Response, "ok")
}
}
}