Merge pull request #270 from longsleep/service-discovery-well-known

Implemented service discovery .well-known endpoint

doc/REST-API.txt

@@ -1,7 +1,7 @@
 
                    Spreed WebRTC REST API v1.0.0
             ===============================================
-                        (c)2014 struktur AG
+                        (c)2016 struktur AG
 
 The server provides a REST api end point to provide functionality outside the
 the channeling API or without a established web socket connection.
@@ -19,6 +19,20 @@ document after connection was established.
 
 Available end points with request methods and content-type:
 
+  /.well-known/spreed-configuration
+
+    The well-known end points can be used to discover the base addresses for
+    other end points. Spreed WebRTC provides this for compatibility with
+    larger setups so clients using this can find the Spreed WebRTC end point.
+
+    GET application/x-www-form-urlencoded
+    No parameters.
+    Response 200:
+      {
+        "spreed-webrtc_endpoint": "http://localhost:8093"
+      }
+
+
   /api/v1/config
 
     The config end points returns the server configuration. As it is available
@@ -178,4 +192,4 @@ https://github.com/strukturag/spreed-webrtc
 For questions, contact mailto:opensource@struktur.de.
 
 
-(c)2014 struktur AG
+(c)2016 struktur AG

src/app/spreed-webrtc-server/main.go

@@ -25,6 +25,7 @@ import (
 	"bytes"
 	"crypto/rand"
 	"encoding/hex"
+	"encoding/json"
 	"flag"
 	"fmt"
 	"github.com/gorilla/mux"
@@ -92,6 +93,38 @@ func sandboxHandler(w http.ResponseWriter, r *http.Request) {
 
 }
 
+func wellKnownHandler(w http.ResponseWriter, r *http.Request) {
+
+	// Detect if the request was made with SSL.
+	ssl := r.TLS != nil
+	scheme := "http"
+	proto, ok := r.Header["X-Forwarded-Proto"]
+	if ok {
+		ssl = proto[0] == "https"
+	}
+	if ssl {
+		scheme = "https"
+	}
+
+	// Construct our URL.
+	url := url.URL{
+		Scheme: scheme,
+		Host:   r.Host,
+		Path:   strings.TrimSuffix(config.B, "/"),
+	}
+	doc := &map[string]string{
+		"spreed-webrtc_endpoint": url.String(),
+	}
+	data, err := json.MarshalIndent(doc, "", "  ")
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(data)
+
+}
+
 func makeImageHandler(buddyImages ImageCache, expires time.Duration) http.HandlerFunc {
 
 	return func(w http.ResponseWriter, r *http.Request) {
@@ -432,6 +465,7 @@ func runner(runtime phoenix.Runtime) error {
 	r.Handle("/robots.txt", http.StripPrefix(config.B, http.FileServer(http.Dir(path.Join(rootFolder, "static")))))
 	r.Handle("/favicon.ico", http.StripPrefix(config.B, http.FileServer(http.Dir(path.Join(rootFolder, "static", "img")))))
 	r.Handle("/ws", makeWSHandler(statsManager, sessionManager, codec, channellingAPI))
+	r.HandleFunc("/.well-known/spreed-configuration", wellKnownHandler)
 
 	// Simple room handler.
 	r.HandleFunc("/{room}", httputils.MakeGzipHandler(roomHandler))