include new finger backend

1 files changed, 130 insertions, 0 deletions

diff --git a/Zotlabs/Zot/Finger.php b/Zotlabs/Zot/Finger.php
new file mode 100644
index 000000000..27ba6ddca
--- /dev/null
+++ b/Zotlabs/Zot/Finger.php
@@ -0,0 +1,130 @@
+<?php
+
+namespace Zotlabs\Zot;
+
+
+class Finger {
+
+	static private $token;
+
+	/**
+	 * @brief Look up information about channel.
+	 *
+	 * @param string $webbie
+	 *   does not have to be host qualified e.g. 'foo' is treated as 'foo\@thishub'
+	 * @param array $channel
+	 *   (optional), if supplied permissions will be enumerated specifically for $channel
+	 * @param boolean $autofallback
+	 *   fallback/failover to http if https connection cannot be established. Default is true.
+	 *
+	 * @return array see z_post_url() and \ref mod/zfinger.php
+	 */
+
+	static public function run($webbie, $channel = null, $autofallback = true) {
+
+		$ret = array('success' => false);
+
+		self::$token = random_string();
+
+		if (strpos($webbie,'@') === false) {
+			$address = $webbie;
+			$host = App::get_hostname();
+		} else {
+			$address = substr($webbie,0,strpos($webbie,'@'));
+			$host = substr($webbie,strpos($webbie,'@')+1);
+		}
+
+		$xchan_addr = $address . '@' . $host;
+
+		if ((! $address) || (! $xchan_addr)) {
+			logger('zot_finger: no address :' . $webbie);
+			return $ret;
+		}
+
+		logger('using xchan_addr: ' . $xchan_addr, LOGGER_DATA, LOG_DEBUG);
+
+		// potential issue here; the xchan_addr points to the primary hub.
+		// The webbie we were called with may not, so it might not be found
+		// unless we query for hubloc_addr instead of xchan_addr
+
+		$r = q("select xchan.*, hubloc.* from xchan
+			left join hubloc on xchan_hash = hubloc_hash
+			where xchan_addr = '%s' and hubloc_primary = 1 limit 1",
+			dbesc($xchan_addr)
+		);
+
+		if ($r) {
+			$url = $r[0]['hubloc_url'];
+
+			if ($r[0]['hubloc_network'] && $r[0]['hubloc_network'] !== 'zot') {
+				logger('zot_finger: alternate network: ' . $webbie);
+				logger('url: '.$url.', net: '.var_export($r[0]['hubloc_network'],true), LOGGER_DATA, LOG_DEBUG);
+				return $ret;
+			}
+		} 
+		else {
+			$url = 'https://' . $host;
+		}
+
+		$rhs = '/.well-known/zot-info';
+		$https = ((strpos($url,'https://') === 0) ? true : false);
+
+		logger('zot_finger: ' . $address . ' at ' . $url, LOGGER_DEBUG);
+
+		if ($channel) {
+			$postvars = array(
+				'address'    => $address,
+				'target'     => $channel['channel_guid'],
+				'target_sig' => $channel['channel_guid_sig'],
+				'key'        => $channel['channel_pubkey'],
+				'token'      => self::$token
+			);
+
+			$result = z_post_url($url . $rhs,$postvars);
+
+			if ((! $result['success']) && ($autofallback)) {
+				if ($https) {
+					logger('zot_finger: https failed. falling back to http');
+					$result = z_post_url('http://' . $host . $rhs,$postvars);
+				}
+			}
+		} 
+		else {
+			$rhs .= '?f=&address=' . urlencode($address) . '&token=' . self::$token;
+
+			$result =  z_fetch_url($url . $rhs);
+			if ((! $result['success']) && ($autofallback)) {
+				if ($https) {
+					logger('zot_finger: https failed. falling back to http');
+					$result = z_fetch_url('http://' . $host . $rhs);
+				}
+			}
+		}
+
+		if(! $result['success']) {
+			logger('zot_finger: no results');
+			return $ret;
+		}
+
+		$x = json_decode($result['body'],true);
+		if($x) {
+			$signed_token = $x['signed_token'];
+			if($signed_token) {
+				$valid = rsa_verify(self::$token,base64url_decode($signed_token),$x['key']);
+				if(! $valid) {
+					logger('invalid signed token: ' . $url . $rhs, LOGGER_NORMAL, LOG_WARN);
+					return $ret;
+				}
+			}
+			else {
+				logger('No signed token from '  . $url . $rhs, LOGGER_NORMAL, LOG_WARN);
+				// after 2017-01-01 this will be a hard error unless you over-ride it.
+				if((time() > 1483228800) && (! get_config('system','allow_unsigned_zotfinger')))
+					return $ret;
+			}
+		}
+
+		return $x;
+	}
+
+}
\ No newline at end of file