From 97d3176754ce7b9dce50d83290a6d3746deff0e8 Mon Sep 17 00:00:00 2001
From: Michael <heluecht@pirati.ca>
Date: Mon, 13 Mar 2017 00:03:27 +0000
Subject: [PATCH] Querying via nodeinfo

---
 include/socgraph.php | 122 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)

diff --git a/include/socgraph.php b/include/socgraph.php
index dee3bfc19..e3e5773b7 100644
--- a/include/socgraph.php
+++ b/include/socgraph.php
@@ -763,6 +763,110 @@ function poco_detect_poco_data($data) {
 	return false;
 }
 
+/**
+ * @brief Detect server type by using the nodeinfo data
+ *
+ * @param string $server_url address of the server
+ * @return array Server data
+ */
+function poco_fetch_nodeinfo($server_url) {
+	$serverret = z_fetch_url($server_url."/.well-known/nodeinfo");
+	if (!$serverret["success"]) {
+		return false;
+	}
+
+	$nodeinfo = json_decode($serverret['body']);
+
+	if (!is_object($nodeinfo)) {
+		return false;
+	}
+
+	if (!is_array($nodeinfo->links)) {
+		return false;
+	}
+
+	$nodeinfo_url = '';
+
+	foreach ($nodeinfo->links AS $link) {
+		if ($link->rel == 'http://nodeinfo.diaspora.software/ns/schema/1.0') {
+			$nodeinfo_url = $link->href;
+		}
+	}
+
+	if ($nodeinfo_url == '') {
+		return false;
+	}
+
+	$serverret = z_fetch_url($nodeinfo_url);
+	if (!$serverret["success"]) {
+		return false;
+	}
+
+	$nodeinfo = json_decode($serverret['body']);
+
+	if (!is_object($nodeinfo)) {
+		return false;
+	}
+
+	$server = array();
+
+	$server['register_policy'] = REGISTER_CLOSED;
+
+	if (is_bool($nodeinfo->openRegistrations) AND $nodeinfo->openRegistrations) {
+		$server['register_policy'] = REGISTER_OPEN;
+	}
+
+	if (is_object($nodeinfo->software)) {
+		if (isset($nodeinfo->software->name)) {
+			$server['platform'] = $nodeinfo->software->name;
+		}
+
+		if (isset($nodeinfo->software->version)) {
+			$server['version'] = $nodeinfo->software->version;
+		}
+	}
+
+	if (is_object($nodeinfo->metadata)) {
+		if (isset($nodeinfo->metadata->nodeName)) {
+			$server['site_name'] = $nodeinfo->metadata->nodeName;
+		}
+	}
+
+	$diaspora = false;
+	$friendica = false;
+	$gnusocial = false;
+
+	if (is_array($nodeinfo->protocols->inbound)) {
+		foreach ($nodeinfo->protocols->inbound AS $inbound) {
+			if ($inbound == 'diaspora') {
+				$diaspora = true;
+			}
+			if ($inbound == 'friendica') {
+				$friendica = true;
+			}
+			if ($inbound == 'gnusocial') {
+				$gnusocial = true;
+			}
+		}
+	}
+
+	if ($gnusocial) {
+		$server['network'] = NETWORK_OSTATUS;
+	}
+	if ($diaspora) {
+		$server['network'] = NETWORK_DIASPORA;
+	}
+	if ($friendica) {
+		$server['network'] = NETWORK_DFRN;
+	}
+
+	if (!$server) {
+		return false;
+	}
+
+	return $server;
+}
+
 /**
  * @brief Detect server type (Hubzilla or Friendica) via the front page body
  *
@@ -1103,6 +1207,24 @@ function poco_check_server($server_url, $network = "", $force = false) {
 		}
 	}
 
+	// Query nodeinfo. Working for (at least) Diaspora and Friendica.
+	if (!$failure) {
+		$server = poco_fetch_nodeinfo($server_url);
+		if ($server) {
+			$register_policy = $server['register_policy'];
+			$platform = $server['platform'];
+			$network = $server['network'];
+
+			if ($version == "") {
+				$version = $server['version'];
+			}
+
+			$site_name = $server['site_name'];
+
+			$last_contact = datetime_convert();
+		}
+	}
+
 	// Check for noscrape
 	// Friendica servers could be detected as OStatus servers
 	if (!$failure AND in_array($network, array(NETWORK_DFRN, NETWORK_OSTATUS))) {