server-side storage model

First pass at a server-side storage model. New tables for consumers,
tokens, and nonces, with associated classes. An OAuthDataStore class
interfaces with the OAuth.php library to enable server logic.

Some additional work to get pretty-OK random number generation into
the utilities library. Use /dev/urandom if available; else use
mt_rand().

darcs-hash:20080527200721-84dde-308c047af2ebc2c4d753c1e1e24af20fef862a7e.gz

1 files changed, 32 insertions, 0 deletions

diff --git a/lib/util.php b/lib/util.php
index 31a2cbd4f..52f25c9d3 100644
--- a/lib/util.php
+++ b/lib/util.php
@@ -447,6 +447,38 @@ function common_root_url() {
 	return "http://".$config['site']['server'].'/'.$pathpart;
 }
 
+# returns $bytes bytes of random data as a hexadecimal string
+# "good" here is a goal and not a guarantee
+
+function common_good_rand($bytes) {
+	# XXX: use random.org...?
+	if (file_exists('/dev/urandom')) {
+		return common_urandom($bytes);
+	} else { # FIXME: this is probably not good enough
+		return common_mtrand($bytes);
+	}
+}
+
+function common_urandom($bytes) {
+	$h = fopen('/dev/urandom', 'rb');
+	# should not block
+	$src = fread($h, $bytes);
+	fclose($h);
+	$enc = '';
+	for ($i = 0; $i < $bytes; $i++) {
+		$enc .= sprintf("%02x", (ord($src[$i])));
+	}
+	return $enc;
+}
+
+function common_mtrand($bytes) {
+	$enc = '';
+	for ($i = 0; $i < $bytes; $i++) {
+		$enc .= sprintf("%02x", mt_rand(0, 255));
+	}
+	return $enc;
+}
+
 // XXX: set up gettext
 
 function _t($str) {