2 files changed, 125 insertions, 0 deletions

diff --git a/README.md b/README.md
index 0bb4db0..efa5cfb 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,9 @@
 Diffusion
 =========
+
+Diffusion is a simple websocket broadcaster written in Go.
+
+Everything sent on /b/{{channel}} is broadcast to every connection on /{{channel}}.
+
+Broadcaster and client accesses can be restricted by a key for each and they will have to connect to /b/{{channel}}?{{broadcaster key}} or /{{channel}}?{{client key}}.
+These keys are definable using command line arguments when starting the program.
\ No newline at end of file
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..bea50be
--- /dev/null
+++ b/main.go
@@ -0,0 +1,118 @@
+/*
+
+        This file is part of Diffusion (https://github.com/Pacien/Diffusion)
+
+        Permission is hereby granted, free of charge, to any person obtaining a copy
+        of this software and associated documentation files (the "Software"), to deal
+        in the Software without restriction, including without limitation the rights
+        to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+        copies of the Software, and to permit persons to whom the Software is
+        furnished to do so, subject to the following conditions:
+
+        The above copyright notice and this permission notice shall be included in
+        all copies or substantial portions of the Software.
+
+        THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+        IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+        FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+        AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+        LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+        OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+        THE SOFTWARE.
+
+*/
+
+// Diffusion
+package main
+
+import (
+        "code.google.com/p/go.net/websocket"
+        "flag"
+        "log"
+        "net/http"
+        "strings"
+)
+
+var broadcastKey = flag.String("broadcastKey", "", "Secret key for braodcasting.")
+var clientKey = flag.String("revieveKey", "", "Secret key for recieving.")
+
+func splitRequest(ws *websocket.Conn, base string) (channelName string, arguments []string) {
+        request := strings.Split(ws.Request().RequestURI[len(base):], "?")
+        channelName = request[0]
+        if len(request) > 1 {
+                arguments = strings.Split(request[1], "&")
+        }
+        return
+}
+
+func auth(submittedKey string, key *string) bool {
+        if *key == "" || submittedKey == *key {
+                return true
+        }
+        return false
+}
+
+var clients = make(map[string]map[int]chan []byte)
+
+func broadcastHandler(ws *websocket.Conn) {
+
+        channelName, arguments := splitRequest(ws, "/b/")
+
+        log.Println("New broadcaster on #" + channelName)
+
+        if !auth(arguments[0], broadcastKey) {
+                return
+        }
+
+        var message = make([]byte, 512)
+
+        for {
+                ws.Read(message)
+
+                log.Println("#" + channelName + ": " + string(message))
+
+                for _, client := range clients[channelName] {
+                        client <- message
+                }
+        }
+
+}
+
+func clientHandler(ws *websocket.Conn) {
+
+        channelName, arguments := splitRequest(ws, "/")
+
+        log.Println("New client on #" + channelName)
+
+        if !auth(arguments[0], clientKey) {
+                return
+        }
+
+        var channel = make(chan []byte)
+
+        clientID := len(clients[channelName])
+        if clientID < 1 {
+                clients[channelName] = make(map[int]chan []byte)
+        }
+        clients[channelName][clientID] = channel
+        defer delete(clients[channelName], clientID)
+
+        for {
+                ws.Write(<-channel)
+        }
+
+}
+
+func main() {
+
+        flag.Parse()
+
+        http.Handle("/b/", websocket.Handler(broadcastHandler))
+        http.Handle("/", websocket.Handler(clientHandler))
+
+        err := http.ListenAndServe(":8080", nil)
+        if err != nil {
+                panic("ListenAndServe: " + err.Error())
+        }
+
+}