Show parameters on index access

README.md

@@ -60,6 +60,11 @@ The server sends a message to the Slack channel on the following triggers:
 If the issue or comment has mentions (i.e. `@foo` or `[~foo]`), the server appends them to the title of message for Slack notification.
 
 
+### Health check endpoint
+
+The server always returns 200 on `GET /healthz` for liveness probe and readiness probe.
+
+
 ## Contribution
 
 This is an open source software licensed under Apache License 2.0.
@@ -71,7 +76,7 @@ Feel free to book your issues or pull requests.
 Start the server:
 
 ```sh
-go build && ./jira-to-slack
+go run main.go
 ```
 
 ### E2E Test

server/index.go

@@ -9,5 +9,10 @@ import (
 type IndexHandler struct{}
 
 func (h *IndexHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	fmt.Fprint(w, "OK")
+	p, err := parseWebhookParams(r)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+	} else {
+		fmt.Fprintf(w, "Parameter=%+v", p)
+	}
 }

server/webhook.go

@@ -15,16 +15,16 @@ import (
 // WebhookHandler handles requests from JIRA wehbook.
 type WebhookHandler struct{}
 
-type requestParams struct {
+type webhookParams struct {
 	webhook  string
 	username string
 	icon     string
 	dialect  message.Dialect
 	debug    bool
 }
 
-func parseRequestParams(r *http.Request) (*requestParams, error) {
-	p := &requestParams{}
+func parseWebhookParams(r *http.Request) (*webhookParams, error) {
+	p := &webhookParams{}
 	q := r.URL.Query()
 	p.webhook = q.Get("webhook")
 	if p.webhook == "" {
@@ -43,15 +43,19 @@ func parseRequestParams(r *http.Request) (*requestParams, error) {
 		return nil, fmt.Errorf("dialect must be slack (default) or mattermost")
 	}
 	switch q.Get("debug") {
+	case "": // default
+	case "0": // default
 	case "1":
 		p.debug = true
+	default:
+		return nil, fmt.Errorf("debug must be 0 (default) or 1")
 	}
 	return p, nil
 }
 
 func (h *WebhookHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	defer r.Body.Close()
-	p, err := parseRequestParams(r)
+	p, err := parseWebhookParams(r)
 	if err != nil {
 		log.Print(err)
 		http.Error(w, err.Error(), http.StatusBadRequest)