Merge remote-tracking branch 'mike/master' into dev

1 files changed, 146 insertions, 0 deletions

diff --git a/Zotlabs/Zot6/Finger.php b/Zotlabs/Zot6/Finger.php
new file mode 100644
index 000000000..f1fe41352
--- /dev/null
+++ b/Zotlabs/Zot6/Finger.php
@@ -0,0 +1,146 @@
+<?php
+
+namespace Zotlabs\Zot6;
+
+/**
+ * @brief Finger
+ *
+ */
+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 $autofallback
+	 *   fallback/failover to http if https connection cannot be established. Default is true.
+	 *
+	 * @return zotinfo array (with 'success' => true) or array('success' => false);
+	 */
+
+	static public function run($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($webbie,'@')+1);
+			if(strpos($host,'/'))
+				$host = substr($host,0,strpos($host,'/'));
+		}
+
+		$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
+			);
+
+			$headers = [];
+			$headers['X-Zot-Channel'] = $channel['channel_address'] . '@' . \App::get_hostname();
+			$headers['X-Zot-Nonce']   = random_string();
+			$xhead = \Zotlabs\Web\HTTPSig::create_sig('',$headers,$channel['channel_prvkey'],
+				'acct:' . $channel['channel_address'] . '@' . \App::get_hostname(),false);
+
+			$retries = 0;
+
+			$result = z_post_url($url . $rhs,$postvars,$retries, [ 'headers' => $xhead ]);
+
+			if ((! $result['success']) && ($autofallback)) {
+				if ($https) {
+					logger('zot_finger: https failed. falling back to http');
+					$result = z_post_url('http://' . $host . $rhs,$postvars, $retries, [ 'headers' => $xhead ]);
+				}
+			}
+		} 
+		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);
+
+		$verify = \Zotlabs\Web\HTTPSig::verify($result,(($x) ? $x['key'] : ''));
+
+		if($x && (! $verify['header_valid'])) {
+			$signed_token = ((is_array($x) && array_key_exists('signed_token', $x)) ? $x['signed_token'] : null);
+			if($signed_token) {
+				$valid = zot_verify('token.' . self::$token, base64url_decode($signed_token), $x['key']);
+				if(! $valid) {
+					logger('invalid signed token: ' . $url . $rhs, LOGGER_NORMAL, LOG_ERR);
+
+					return $ret;
+				}
+			}
+			else {
+				logger('No signed token from '  . $url . $rhs, LOGGER_NORMAL, LOG_WARNING);
+				return $ret;
+			}
+		}
+
+		return $x;
+	}
+
+}