First running version (#2)

This currently depends of interacting with matrix_synapse_rest_auth[1] and mxisd[2].
How to integrate that is explained in the README

[1] https://github.com/kamax-io/matrix-synapse-rest-auth
[2] https://github.com/kamax-io/mxisd

MatrixConnection.php

@@ -0,0 +1,155 @@
+<?php
+class MatrixConnection
+{
+	private $hs;
+	private $at;
+
+	function __construct($homeserver, $access_token) {
+		$this->hs = $homeserver;
+		$this->at = $access_token;
+	}
+
+	function send($room_id, $message) {
+		if (!$this->at) {
+			error_log("No access token defined");
+			return false;
+		}
+
+		$send_message = NULL;
+		if (!$message) {
+			error_log("no message to send");
+			return false;
+		} elseif(is_array($message)) {
+			$send_message = $message;
+		} elseif ($message instanceof MatrixMessage) {
+			$send_message = $message->get_object();
+		} else {
+			error_log("message is of not valid type\n");
+			return false;
+		}
+
+		$url="https://".$this->hs."/_matrix/client/r0/rooms/"
+			. urlencode($room_id) ."/send/m.room.message?access_token=".$this->at;
+		$handle = curl_init($url);
+		curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
+		curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 5);
+		curl_setopt($handle, CURLOPT_TIMEOUT, 60);
+		curl_setopt($handle, CURLOPT_POSTFIELDS, json_encode($send_message));
+		curl_setopt($handle, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
+
+		$response = $this->exec_curl_request($handle);
+		return isset($response["event_id"]);
+	}
+
+	function send_msg($room_id, $message) {
+		return $this->send($room_id, array(
+					"msgtype" => "m.notice",
+					"body" => $message
+					)
+				);
+	}
+
+	function hasUser($username) {
+		if (!$username) {
+			throw new Exception ("no user given to lookup");
+		}
+
+		$url = "https://".$this->hs."/_matrix/client/r0/profile/@" . $username . ":" . $this->hs;
+		$handle = curl_init($url);
+		curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
+		curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 5);
+		curl_setopt($handle, CURLOPT_TIMEOUT, 60);
+		curl_setopt($handle, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
+
+		$res = $this->exec_curl_request($handle);
+		return !(isset($res["errcode"]) && $res["errcode"] == "M_UNKNOWN");
+	}
+
+	function register($username, $password, $shared_secret) {
+		if (!$username) {
+			error_log("no username provided");
+		}
+		if (!$password) {
+			error_log("no message to send");
+		}
+
+		$mac = hash_hmac('sha1', $username, $shared_secret);
+
+		$data = array(
+				"username" => $username,
+				"password" => $password,
+				"mac" => $mac,
+			     );
+		$url = "https://".$this->hs."/_matrix/client/v2_alpha/register";
+		$handle = curl_init($url);
+		curl_setopt($handle, CURLOPT_RETURNTRANSFER, true);
+		curl_setopt($handle, CURLOPT_CONNECTTIMEOUT, 5);
+		curl_setopt($handle, CURLOPT_TIMEOUT, 60);
+		curl_setopt($handle, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
+		curl_setopt($handle, CURLOPT_POSTFIELDS, json_encode($data));
+
+		return $this->exec_curl_request($handle);
+	}
+
+	function exec_curl_request($handle) {
+		$response = curl_exec($handle);
+
+		if ($response === false) {
+			$errno = curl_errno($handle);
+			$error = curl_error($handle);
+			error_log("Curl returned error $errno: $error\n");
+			curl_close($handle);
+			return false;
+		}
+
+		$http_code = intval(curl_getinfo($handle, CURLINFO_HTTP_CODE));
+		curl_close($handle);
+
+		if ($http_code >= 500) {
+			// do not want to DDOS server if something goes wrong
+			sleep(10);
+			return false;
+		} else if ($http_code != 200) {
+			$response = json_decode($response, true);
+			error_log("Request has failed with error {$response['error']}\n");
+			if ($http_code == 401) {
+				throw new Exception('Invalid access token provided');
+			}
+		} else {
+			$response = json_decode($response, true);
+		}
+
+		return $response;
+	}
+}
+
+class MatrixMessage
+{
+	private $message;
+
+	function __construct() {
+		$this->message = ["msgtype" => "m.notice"];
+	}
+
+	function set_type($msgtype) {
+		$this->message["msgtype"] = $msgtype;
+	}
+
+	function set_format($format) {
+		$this->message["format"] = $format;
+	}
+
+	function set_body($body) {
+		$this->message["body"] = $body;
+	}
+
+	function set_formatted_body($fbody, $format="org.matrix.custom.html") {
+		$this->message["formatted_body"] = $fbody;
+		$this->message["format"] = $format;
+	}
+
+	function get_object() {
+		return $this->message;
+	}
+}
+?>