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webhook.go
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webhook.go
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package main
import (
"crypto"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
lib "devstats"
"encoding/base64"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"os"
"strings"
"time"
)
// Payload signature verification based on:
// https://gist.github.com/theshapguy/7d10ea4fa39fab7db393021af959048e
type repository struct {
Name string `json:"name"`
OwnerName string `json:"owner_name"`
}
type payload struct {
Branch string `json:"branch"`
Result int `json:"result"`
ResultMessage string `json:"result_message"`
Type string `json:"type"`
AuthorEmail string `json:"author_email"`
AuthorName string `json:"author_name"`
Message string `json:"message"`
Repo repository `json:"repository"`
}
type configKey struct {
Config struct {
Host string `json:"host"`
ShortenHost string `json:"shorten_host"`
Assets struct {
Host string `json:"host"`
} `json:"assets"`
Pusher struct {
Key string `json:"key"`
} `json:"pusher"`
Github struct {
APIURL string `json:"api_url"`
Scopes []string `json:"scopes"`
} `json:"github"`
Notifications struct {
Webhook struct {
PublicKey string `json:"public_key"`
} `json:"webhook"`
} `json:"notifications"`
} `json:"config"`
}
func respondWithError(w http.ResponseWriter, m string) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(401)
message := fmt.Sprintf("{\"message\": \"%s\"}", m)
_, _ = w.Write([]byte(message))
}
func respondWithSuccess(w http.ResponseWriter, m string) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(200)
message := fmt.Sprintf("{\"message\": \"%s\"}", m)
_, _ = w.Write([]byte(message))
}
func payloadSignature(r *http.Request) ([]byte, error) {
signature := r.Header.Get("Signature")
b64, err := base64.StdEncoding.DecodeString(signature)
if err != nil {
return nil, errors.New("cannot decode signature")
}
return b64, nil
}
func payloadDigest(payload string) []byte {
hash := sha1.New()
_, _ = hash.Write([]byte(payload))
return hash.Sum(nil)
}
func parsePublicKey(key string) (*rsa.PublicKey, error) {
// https://golang.org/pkg/encoding/pem/#Block
block, _ := pem.Decode([]byte(key))
if block == nil || block.Type != "PUBLIC KEY" {
return nil, errors.New("invalid public key")
}
publicKey, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, errors.New("invalid public key")
}
return publicKey.(*rsa.PublicKey), nil
}
func travisPublicKey() (*rsa.PublicKey, error) {
response, err := http.Get("https://api.travis-ci.org/config")
if err != nil {
return nil, errors.New("cannot fetch travis public key")
}
defer func() { _ = response.Body.Close() }()
decoder := json.NewDecoder(response.Body)
var t configKey
err = decoder.Decode(&t)
if err != nil {
return nil, errors.New("cannot decode travis public key")
}
key, err := parsePublicKey(t.Config.Notifications.Webhook.PublicKey)
if err != nil {
return nil, err
}
return key, nil
}
// checkError: report error to HTTP writer if present
func checkError(isError bool, w http.ResponseWriter, err error) bool {
if err != nil {
if isError {
lib.Printf("webhook: error: %v\n", err)
fmt.Fprintf(os.Stderr, "webhook: error: %v\n", err)
} else {
lib.Printf("webhook: warning: %v\n", err)
}
errMsg := fmt.Sprintf("webhook: %v", err)
respondWithError(w, errMsg)
return true
}
return false
}
// checkDeployEnvError - checks if env variables needed for deploy mode are set.
func checkDeployEnvError(w http.ResponseWriter) bool {
var errMsg string
if os.Getenv("PG_PASS") == "" {
errMsg += "Environment variable 'PG_PASS' must be set in [deploy] mode\n"
}
if errMsg != "" {
lib.Printf("webhook: error: %s\n", errMsg)
fmt.Fprintf(os.Stderr, "webhook: error: %s\n", errMsg)
respondWithError(w, "webhook: "+errMsg)
return true
}
return false
}
// successPayload: is this a success payload?
func successPayload(ctx *lib.Ctx, pl payload) bool {
if pl.Repo.Name != lib.Devstats || pl.Repo.OwnerName != "cncf" {
return false
}
if strings.Contains(pl.Message, "[no deploy]") {
return false
}
ok := false
for _, status := range ctx.DeployStatuses {
if pl.ResultMessage == status {
ok = true
break
}
}
if !ok {
return false
}
ok = false
for _, result := range ctx.DeployResults {
if pl.Result == result {
ok = true
break
}
}
if !ok {
return false
}
ok = false
for _, typ := range ctx.DeployTypes {
if pl.Type == typ {
ok = true
break
}
}
if !ok {
return false
}
ok = false
for _, branch := range ctx.DeployBranches {
if pl.Branch == branch {
ok = true
break
}
}
return ok
}
// webhookHandler receives Travis CI webhook and parses it
func webhookHandler(w http.ResponseWriter, r *http.Request) {
// Start date
dtStart := time.Now()
// Environment context parse
var ctx lib.Ctx
ctx.Init()
// Processing new webhook
lib.Printf("WebHook processing event %s at %v\n", r.RemoteAddr, time.Now())
lib.Printf("WebHook config is Host:%s Port:%s Root:%s\n", ctx.WebHookHost, ctx.WebHookPort, ctx.WebHookRoot)
// Payload checking
var jsonStr string
if ctx.CheckPayload {
key, err := travisPublicKey()
if checkError(true, w, err) {
return
}
signature, err := payloadSignature(r)
if checkError(true, w, err) {
return
}
jsonStr = r.FormValue("payload")
payload := payloadDigest(jsonStr)
err = rsa.VerifyPKCS1v15(key, crypto.SHA1, payload, signature)
if err != nil {
lib.Printf("webhook: unauthorized payload: %v", err)
respondWithError(w, errors.New("unauthorized payload").Error())
return
}
} else {
body, err := ioutil.ReadAll(r.Body)
if checkError(true, w, err) {
return
}
sBody, err := url.QueryUnescape(string(body))
if checkError(true, w, err) {
return
}
jsonStr = sBody[8:]
}
//pretty := lib.PrettyPrintJSON([]byte(jsonStr))
var payload payload
err := json.Unmarshal([]byte(jsonStr), &payload)
if checkError(true, w, err) {
return
}
lib.Printf("WebHook: repo: %s/%s, allowed: cncf/devstats\n", payload.Repo.OwnerName, payload.Repo.Name)
lib.Printf("WebHook: branch: %s, allowed branches: %v\n", payload.Branch, ctx.DeployBranches)
lib.Printf("WebHook: status: %s, allowed statuses: %v\n", payload.ResultMessage, ctx.DeployStatuses)
lib.Printf("WebHook: type: %s, allowed types: %v\n", payload.Type, ctx.DeployTypes)
lib.Printf("WebHook: result: %d, allowed results: %v\n", payload.Result, ctx.DeployResults)
lib.Printf("WebHook: author: name: %s, email: %s\n", payload.AuthorName, payload.AuthorEmail)
lib.Printf("WebHook: message: %s\n", payload.Message)
if !successPayload(&ctx, payload) {
checkError(false, w, errors.New("webhook: skipping deploy due to wrong status, result, branch, message and/or type"))
return
}
err = os.Chdir(ctx.ProjectRoot)
if checkError(true, w, err) {
return
}
// Create PID file (if not exists)
// If PID file exists, exit
pid := os.Getpid()
pidFile := "/tmp/webhook.pid"
trials := 0
maxTrials := 3800
for {
f, err := os.OpenFile(pidFile, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0700)
if err != nil {
switch err.(type) {
case *os.PathError:
if trials == 0 {
lib.Printf("Another `webhook` instance is running, PID file '%s' exists, waiting\n", pidFile)
}
time.Sleep(time.Second)
trials++
if trials >= maxTrials {
lib.Printf("Another `webhook` instance is running, PID file '%s' exists, tried %d times, exiting\n", pidFile, trials)
return
}
default:
fmt.Printf("WebHook: error: %v, exiting\n", err)
return
}
continue
}
fmt.Fprintf(f, "%d", pid)
lib.FatalOnError(f.Close())
break
}
if trials > 0 {
lib.Printf("Another `webhook` instance was running, waited %d seconds\n", trials)
}
// Schedule remove PID file when finished
defer func() { lib.FatalOnError(os.Remove(pidFile)) }()
// Do deployment
lib.Printf("WebHook: deploying via `%s`\n", "make install")
ctx.ExecFatal = false
lib.Printf("WebHook: git checkout %s\n", payload.Branch)
_, err = lib.ExecCommand(&ctx, []string{"git", "checkout", payload.Branch}, nil)
if checkError(true, w, err) {
return
}
lib.Printf("WebHook: %s\n", "git pull")
_, err = lib.ExecCommand(&ctx, []string{"git", "pull"}, nil)
if checkError(true, w, err) {
return
}
lib.Printf("WebHook: %s\n", "make")
_, err = lib.ExecCommand(&ctx, []string{"make"}, nil)
if checkError(true, w, err) {
return
}
lib.Printf("WebHook: %s\n", "make install")
_, err = lib.ExecCommand(&ctx, []string{"make", "install"}, nil)
if checkError(true, w, err) {
return
}
deployedBy := "'make install'"
if ctx.FullDeploy && strings.Contains(payload.Message, "[deploy]") {
if checkDeployEnvError(w) {
return
}
lib.Printf("WebHook: %s\n", "./devel/deploy_all.sh")
_, err = lib.ExecCommand(
&ctx,
[]string{"./devel/deploy_all.sh"},
map[string]string{"FROM_WEBHOOK": "1"},
)
if checkError(true, w, err) {
return
}
lib.Printf("WebHook: %s succeeded\n", "./devel/deploy_all.sh")
deployedBy += ", './devel/deploy_all.sh'"
}
dtEnd := time.Now()
lib.Printf("WebHook: deployed via %s in %v\n", deployedBy, dtEnd.Sub(dtStart))
respondWithSuccess(w, "ok")
}
func main() {
// Environment context parse
var ctx lib.Ctx
ctx.Init()
if ctx.ProjectRoot == "" {
lib.Printf("You need to define reposiory path via GHA2DB_PROJECT_ROOT=/path/to/repo %s\n", os.Args[0])
return
}
// Start webhook server
// WebHookHost defaults to "127.0.0.1"
// WebHookPort defaults to ":1982"
// WebHookRoot defaults to "/"
http.HandleFunc(ctx.WebHookRoot, webhookHandler)
_ = http.ListenAndServe(ctx.WebHookHost+ctx.WebHookPort, nil)
}