othw/JavaScript/index.html at master · dropbox/othw · GitHub

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
<!DOCTYPE html>
<html lang="en">
	<head>
	</head>
	<body>
		<script src="superagent.js"></script>
		<script src="cookie.min.js"></script>
		<script>
			var APP_KEY = '<YOUR APP KEY>';

			// Note that this isn't cryptographically random!
			function random_string() {
				var alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';
				var s = '';
				for (var i = 0; i < 22; i++) {
					s += alphabet.charAt(Math.floor(Math.random() * alphabet.length));
				}
				return s;
			}

			function get_redirect_uri() {
				return window.location.href.substring(0, window.location.href.length - window.location.hash.length).replace(/\/$/, '');
			}

			function parseqs(text) {
				var split = text.split('&');
				var params = {};
				for (var i = 0; i < split.length; i++) {
					var kv = split[i].split('=', 2);
					params[kv[0]] = kv[1];
				}
				return params;
			}

			if (window.location.hash) {
				var params = parseqs(window.location.hash.substring(1));
				if (params.error) {
					document.write("ERROR " + params.error + ": " + params.error_description.replace(/\+/g, ' '));
				} else {
					var csrf = cookie.get('csrf');
					cookie.remove('csrf');
					if (!csrf || params.state != csrf) {
						document.write("ERROR: Possible CSRF attack.");
					} else {
						access_token = parseqs(window.location.hash.substring(1)).access_token;
						superagent
							.get('https://api.dropbox.com/1/account/info')
							.set('Authorization', 'Bearer '+access_token)
							.end(function (res) {
								if (res.status === 200) {
									document.write('Successfully authenticated as ' + JSON.parse(res.text)['display_name'] + '.');
								}
							});
					}
				}
			} else {
				var csrf = random_string();
				cookie.set('csrf', csrf);
				window.location = 'https://www.dropbox.com/1/oauth2/authorize?client_id='
					+ encodeURIComponent(APP_KEY)
					+ '&state=' + encodeURIComponent(csrf)
					+ '&response_type=token&redirect_uri=' + encodeURIComponent(get_redirect_uri());
			}
		</script>
	</body>
</html>