1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204

205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224

<?PHP
	$owa = new OWA('<username>', '<password>');
	if(isset($_GET['user']))
		$owa->freeBusyICS($_GET['user'], true);

	if(isset($_GET['accept']))
		$owa->accept($_GET['accept']);

	if(isset($_GET['decline']))
		$owa->decline($_GET['decline']);

	if(isset($_GET['tentative']))
		$owa->tentative($_GET['tentative']);

	class OWA
	{
		public $username;
		public $password;
		public $url = "<outlook web access URL>";
		public $domain = "<the part after the @ in your email address>";

		private $tmpfile;

		public function __construct($un, $pw)
		{
			$this->tmpfile = tempnam("/tmp", "owa");
			$this->username = $un;
			$this->password = $pw;
			$this->login();
		}

		// Create a new curl session and login to OWA.
		public function login()
		{
			@unlink($this->tmpfile);
			$ch = curl_init();
			curl_setopt($ch, CURLOPT_URL, $this->url . "/exchange/");
			curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
			curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
			curl_setopt($ch, CURLOPT_COOKIEJAR, $this->tmpfile);
			curl_setopt($ch, CURLOPT_COOKIEFILE, $this->tmpfile);
			curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.1) Gecko/20061024 BonEcho/2.0");
			curl_setopt($ch, CURLOPT_REFERER, $this->url . "/exchweb/bin/auth/owalogon.asp?url={$this->url}/exchange&reason=0");

			$headers = array();
			$headers[] = "Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5";
			$headers[] = "Accept-Language: en-us,en;q=0.5";
			$headers[] = "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7";
			curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

			$html = curl_exec($ch);
			curl_close($ch);

			$ch = curl_init();
			curl_setopt($ch, CURLOPT_URL, $this->url . "/exchweb/bin/auth/owaauth.dll");
			curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
			curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
			curl_setopt($ch, CURLOPT_COOKIEJAR, $this->tmpfile);
			curl_setopt($ch, CURLOPT_COOKIEFILE, $this->tmpfile);
			curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.1) Gecko/20061024 BonEcho/2.0");
			curl_setopt($ch, CURLOPT_REFERER, $this->url . "/exchweb/bin/auth/owalogon.asp?url={$this->url}/exchange&reason=0");

			$headers = array();
			$headers[] = "Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5";
			$headers[] = "Accept-Language: en-us,en;q=0.5";
			$headers[] = "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7";
			curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

			curl_setopt($ch, CURLOPT_POST, true);
		 	curl_setopt($ch, CURLOPT_POSTFIELDS, "destination=" . urlencode($this->url) . "%2Fexchange&flags=0&username=" . urlencode($this->username) . "&password=" . urlencode($this->password) . "&SubmitCreds=Log+On&trusted=0");

			$html = curl_exec($ch);

			curl_close($ch);
		}

		// After logging in, grab the contents of an OWA URL.
		function get($url)
		{
			$ch = curl_init();
			curl_setopt($ch, CURLOPT_URL, $this->url . $url);
			curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
			curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
			curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
			curl_setopt($ch, CURLOPT_COOKIEJAR, $this->tmpfile);
			curl_setopt($ch, CURLOPT_COOKIEFILE, $this->tmpfile);
			curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.1) Gecko/20061024 BonEcho/2.0");
			curl_setopt($ch, CURLOPT_REFERER, $this->url . "/exchweb/bin/auth/owalogon.asp?url={$this->url}/exchange&reason=0");

			$headers = array();
			$headers[] = "Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5";
			$headers[] = "Accept-Language: en-us,en;q=0.5";
			$headers[] = "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7";
			curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

			$html = curl_exec($ch);
			curl_close($ch);
			return $html;
		}

		// Returns Free/Busy schedule for a user on a given day.
		// $ts is a timestamp on the day you want info for. Defaults to current time.
		function availability($user, $ts = null)
		{
			if(is_null($ts)) $ts = time();
			$html = $this->get("/public/?Cmd=freebusy&start=" . date("Y-m-d", $ts) . "T00:00:00-08:00&u=$user@{$this->domain};0");
			preg_match_all('!<tr.*?</tr!msi', $html, $matches);
			$data = $matches[0][4];
			preg_match_all('!#[a-f0-9]{6}!msi', $data, $matches);
			array_shift($matches[0]);
			array_shift($matches[0]);

			list($m, $d, $y) = explode(",", date("m,d,Y", $ts));

			$status = array();
			$choices = array("#99CCFF" => "Tentative", "#0000FF" => "Busy", "#660066" => "Out of Office", "#FFFFFF" => "No Information", "#FFE3A5" => "");
			for($t = mktime(0, 0, 0, $m, $d, $y); $t < mktime(23, 59, 59, $m, $d, $y); $t += 1800)
			{
				$cur = $choices[array_shift($matches[0])];
				if(($cur != "No Information") && ($cur != ""))
					$status[] = array("status" => $cur, "date" => date("Y-m-d H:i:00", $t));
				else
					$status[] = array("status" => "", "date" => date("Y-m-d H:i:00", $t));
			}
			return $status;
		}

		// Builds an iCalendar file of a user's Free/Busy schedule.
		// Can optionally output to a browser as an .ics attachment.
		function freeBusyICS($user, $output = false)
		{
			$info = $this->availability($user);

			$out  = "BEGIN:VCALENDAR\n";
			$out .= "VERSION:2.0\n";
			$out .= "PRODID:-//hacksw/handcal//NONSGML v1.0//EN\n";

			for($ts = time() - 86400 * 2; $ts < (time() + 86400 * 8); $ts += 86400)
			{
				$info = $this->availability($user, $ts);
				for($i = 0; $i < count($info); $i++)
				{
					if($info[$i]['status'] != "")
					{
						$out .= "BEGIN:VEVENT\n";
						$out .= "SEQUENCE:4\n";
						$out .= "TRANSP:OPAQUE\n";
						$out .= "UID:" . md5($user . $info[$i]['date']) . "\n";
						$out .= "DTSTART;TZID=US/Pacific:" . date('Ymd\THi00', strtotime($info[$i]['date'])) . "\n";
						$out .= "SUMMARY:" . ucwords($info[$i]['status']) . "\n";

						$end = $info[$i]['date'];
						$j = $i + 1;
						while(isset($info[$j]) && ($info[$j]['status'] == $info[$i]['status']))
						{
							$info[$j]['status'] = "";
							$end = $info[$j]['date'];
							$j++;
						}

						$out .= "DTEND;TZID=US/Pacific:" . date('Ymd\THi00', strtotime($end) + 1800) . "\n";
						$out .= "END:VEVENT\n";
					}
				}
			}

			$out .= "END:VCALENDAR\n";

			if($output)
			{
				header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
				header("Content-Disposition: attachment; filename=$user.ics");
				header("Content-Length: " . strlen($out));
				header("Content-type: text/calendar");
				echo $out;
			}
			else
				return $out;
		}

		// Accepts an event. You can pass in the event's OWA URL or an email
		// message on disk containing the link (for Applescript tie-ins).
		function accept($url)
		{
			if(substr($url, 0, 4) != "http") $url = $this->extractURLFromMessage($url);
			$url = preg_replace('!^.*?(/Exchange.*)$!', "$1", $url);
			$url = str_replace("?cmd=open", "?Cmd=accept", $url);
			$this->get($url);
		}

		// Declines an event. You can pass in the event's OWA URL or an email
		// message on disk containing the link (for Applescript tie-ins).
		function decline($url)
		{
			if(substr($url, 0, 4) != "http") $url = $this->extractURLFromMessage($url);
			$url = preg_replace('!^.*?(/Exchange.*)$!', "$1", $url);
			$url = str_replace("?cmd=open", "?Cmd=decline", $url);
			$this->get($url);
		}

		// Tentatively accepts an event. You can pass in the event's OWA URL or an email
		// message on disk containing the link (for Applescript tie-ins).
		function tentative($url)
		{
			if(substr($url, 0, 4) != "http") $url = $this->extractURLFromMessage($url);
			$url = preg_replace('!^.*?(/Exchange.*)$!', "$1", $url);
			$url = str_replace("?cmd=open", "?Cmd=tentative", $url);
			$this->get($url);
		}
		
		// Extracts the event's OWA link from a message on disk.
		function extractURLFromMessage($fn)
		{
			$file = file_get_contents($fn);
			preg_match('!Microsoft Outlook Web Access.*?(http://.*?open)!ms', $file, $matches);
			$url = str_replace("=\n", "", $matches[1]);
			return $url;
		}
	}