Add subscription, with notification

cmd/hubserver/main.go

@@ -1,9 +1,13 @@
 package main
 
-import "log"
+import (
-
+	"fmt"
-//import "strconv"
+	"log"
-import "net/http"
+	"strings"
+	//import "strconv"
+	"net/http"
+	"net/url"
+)
 
 type subscriptionHandler struct {
 }
@@ -20,9 +24,9 @@ func (handler *subscriptionHandler) ServeHTTP(w http.ResponseWriter, r *http.Req
 		return
 	}
 
-	// mode := r.Form.Get("hub.mode")
+	mode := r.Form.Get("hub.mode")
-	// callback := r.Form.Get("hub.callback")
+	callback := r.Form.Get("hub.callback")
-	// topic := r.Form.Get("hub.topic")
+	topic := r.Form.Get("hub.topic")
 	// leaseSecondsStr := r.Form.Get("hub.lease_seconds")
 	// leaseSeconds, err := strconv.ParseInt(leaseSecondsStr, 10, 64)
 	// if leaseSecondsStr != "" && err != nil {
@@ -30,6 +34,39 @@ func (handler *subscriptionHandler) ServeHTTP(w http.ResponseWriter, r *http.Req
 	// 	return
 	// }
 	// secret := r.Form.Get("hub.secret")
+
+	if mode == "subscribe" {
+		callbackURL, err := url.Parse(callback)
+		if err != nil {
+			http.Error(w, "Can't parse url", 400)
+			return
+		}
+
+		topicURL, err := url.Parse(topic)
+		if err != nil {
+			http.Error(w, "Can't parse url", 400)
+			return
+		}
+
+		w.WriteHeader(202)
+		fmt.Fprint(w, "Accepted")
+
+		go func() {
+			client := http.Client{}
+			req, err := http.NewRequest("POST", callbackURL.String(), strings.NewReader("TEST"))
+			req.Header.Add("Content-Type", "text/plain")
+			req.Header.Add("Link", fmt.Sprintf("<https://hub.stuifzandapp.com/>; rel=hub, <%s>; rel=self", topicURL.String()))
+			res, err := client.Do(req)
+			log.Println(res, err)
+		}()
+
+		return
+	} else if mode == "unsubcribe" {
+		return
+	} else {
+		http.Error(w, "Unknown hub.mode", 400)
+		return
+	}
 }
 
 func main() {