package github import ( "fmt" "io/ioutil" "log" "net/http" "os" "strings" "git.rootprojects.org/root/gitdeploy/internal/options" "git.rootprojects.org/root/gitdeploy/internal/webhooks" "github.com/go-chi/chi" // TODO nix this dependency in favor of a lightweight X-Hub-Signature // and JSON-to-Go-struct approach "github.com/google/go-github/v32/github" ) func init() { var githubSecret string options.ServerFlags.StringVar( &githubSecret, "github-secret", "", "secret for github webhooks (same as GITHUB_SECRET=)", ) webhooks.AddProvider("github", InitWebhook("github", &githubSecret, "GITHUB_SECRET")) } func InitWebhook(providername string, secret *string, envname string) func() { return func() { if "" == *secret { *secret = os.Getenv(envname) } if "" == *secret { fmt.Fprintf(os.Stderr, "skipped route for missing %s\n", envname) return } githubSecretB := []byte(*secret) webhooks.AddRouteHandler(providername, func(router chi.Router) { router.Post("/", func(w http.ResponseWriter, r *http.Request) { r.Body = http.MaxBytesReader(w, r.Body, options.DefaultMaxBodySize) payload, err := ioutil.ReadAll(r.Body) if err != nil { // if there's a read error, it should have been handled already by the MaxBytesReader return } sig := r.Header.Get("X-Hub-Signature") if err := github.ValidateSignature(sig, payload, githubSecretB); nil != err { log.Printf("invalid github signature: error: %s\n", err) http.Error(w, "invalid github signature", http.StatusBadRequest) return } hookType := github.WebHookType(r) event, err := github.ParseWebHook(hookType, payload) if err != nil { log.Printf("invalid github webhook payload: error: %s\n", err) http.Error(w, "invalid github webhook payload", http.StatusBadRequest) return } switch e := event.(type) { case *github.PushEvent: var branch string var tag string ref := e.GetRef() // *e.Ref parts := strings.Split(ref, "/") refType := parts[1] prefixLen := len("refs/") + len(refType) + len("/") refName := ref[prefixLen:] switch refType { case "tags": refType = "tag" tag = refName case "heads": refType = "branch" branch = refName } webhooks.Hook(webhooks.Ref{ HTTPSURL: e.GetRepo().GetCloneURL(), SSHURL: e.GetRepo().GetSSHURL(), Rev: e.GetAfter(), // *e.After Ref: ref, RefType: refType, RefName: refName, Branch: branch, Tag: tag, Repo: e.GetRepo().GetName(), // *e.Repo.Name Owner: e.GetRepo().GetOwner().GetLogin(), }) /* case *github.PullRequestEvent: // probably doesn't matter case *github.StatusEvent: // probably doesn't matter case *github.WatchEvent: // probably doesn't matter */ default: log.Printf("unknown event type %s\n", hookType) return } }) }) } }