From fed5224f465e36731b94d4ee492f1bbc95f2941f Mon Sep 17 00:00:00 2001
From: Sascha Nitsch <sascha.nitsch@spsn.net>
Date: Mon, 22 Jul 2024 17:27:48 +0200
Subject: [PATCH] support for nodeinfo

---
 README.md                                |  2 +-
 php/federator/api.php                    | 14 ++---
 php/federator/api/wellknown.php          | 14 ++++-
 php/federator/api/wellknown/nodeinfo.php | 77 ++++++++++++++++++++++++
 php/federator/cache/cache.php            |  8 +++
 php/federator/connector/connector.php    |  7 +++
 php/federator/data/stats.php             | 70 +++++++++++++++++++++
 php/federator/dio/stats.php              | 45 ++++++++++++++
 plugins/federator/contentnation.php      | 24 ++++++++
 plugins/federator/dummyconnector.php     | 14 +++++
 plugins/federator/rediscache.php         | 38 +++++++++++-
 rediscache.ini                           |  1 +
 templates/federator/nodeinfo.json        |  8 +++
 templates/federator/nodeinfo2.0.json     | 29 +++++++++
 templates/federator/nodeinfo2.1.json     | 30 +++++++++
 15 files changed, 368 insertions(+), 13 deletions(-)
 create mode 100644 php/federator/api/wellknown/nodeinfo.php
 create mode 100644 php/federator/data/stats.php
 create mode 100644 php/federator/dio/stats.php
 create mode 100644 templates/federator/nodeinfo.json
 create mode 100644 templates/federator/nodeinfo2.0.json
 create mode 100644 templates/federator/nodeinfo2.1.json

diff --git a/README.md b/README.md
index 2661184..4598b36 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ This will be changed, but works for the current develop verison.
 
 If the include redis cache is enabled, create a users.acl for redis with the content:
 
-    user federator on ~u_* +get +set >redis*change*password
+    user federator on ~u_* +get +set  ~s_* +get +setex ~m_* +get +setex >redis*change*password
 
 change password in the rediscache.ini to match your given password.
 
diff --git a/php/federator/api.php b/php/federator/api.php
index 931771b..5134850 100644
--- a/php/federator/api.php
+++ b/php/federator/api.php
@@ -94,6 +94,10 @@ class Api extends Main
             }
         }
         switch ($this->paths[0]) {
+            case '.well-known':
+            case 'nodeinfo':
+                $handler = new Api\WellKnown($this);
+                break;
             case 'v1':
                 switch ($this->paths[1]) {
                     case 'dummy':
@@ -101,9 +105,6 @@ class Api extends Main
                         break;
                 }
                 break;
-            case '.well-known':
-                $handler = new Api\WellKnown($this);
-                break;
         }
         $printresponse = true;
         if ($handler !== null) {
@@ -126,14 +127,13 @@ class Api extends Main
                 header($name . ': ' . $value);
             }
         }
+        if ($this->responseCode != 200) {
+            http_response_code($this->responseCode);
+        }
         if ($printresponse) {
             if ($this->redirect !== null) {
                 header("Location: $this->redirect");
             }
-            // @phan-suppress-next-line PhanSuspiciousValueComparison
-            if ($this->responseCode != 200) {
-                http_response_code($this->responseCode);
-            }
             if ($this->responseCode != 404) {
                 header("Content-type: " . $this->contentType);
                 header("Access-Control-Allow-Origin: *");
diff --git a/php/federator/api/wellknown.php b/php/federator/api/wellknown.php
index 95bccdd..c2525fa 100644
--- a/php/federator/api/wellknown.php
+++ b/php/federator/api/wellknown.php
@@ -51,9 +51,17 @@ class WellKnown implements APIInterface
             case 'GET':
                 switch (sizeof($paths)) {
                     case 2:
-                        if ($paths[1] === 'webfinger') {
-                            $wf = new WellKnown\WebFinger($this, $this->main);
-                            return $wf->exec();
+                        if ($paths[0] === 'nodeinfo') {
+                            $ni = new WellKnown\NodeInfo($this, $this->main);
+                            return $ni->exec($paths);
+                        }
+                        switch ($paths[1]) {
+                            case 'nodeinfo':
+                                $ni = new WellKnown\NodeInfo($this, $this->main);
+                                return $ni->exec($paths);
+                            case 'webfinger':
+                                $wf = new WellKnown\WebFinger($this, $this->main);
+                                return $wf->exec();
                         }
                 }
                 break;
diff --git a/php/federator/api/wellknown/nodeinfo.php b/php/federator/api/wellknown/nodeinfo.php
new file mode 100644
index 0000000..0d5b251
--- /dev/null
+++ b/php/federator/api/wellknown/nodeinfo.php
@@ -0,0 +1,77 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2024 Sascha Nitsch (grumpydeveloper) https://contentnation.net/@grumpydevelop
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * @author Sascha Nitsch (grumpydeveloper)
+ **/
+
+namespace Federator\Api\WellKnown;
+
+class NodeInfo
+{
+    /**
+     * parent instance
+     *
+     * @var \Federator\Api\WellKnown $wellKnown
+     */
+    private $wellKnown;
+
+    /**
+     * main instance
+     *
+     * @var \Federator\Main $main
+     */
+    private $main;
+
+    /**
+     * constructor
+     *
+     * @param \Federator\Api\WellKnown $wellKnown parent instance
+     * @param \Federator\Main $main main instance
+     * @return void
+     */
+    public function __construct($wellKnown, $main)
+    {
+        $this->wellKnown = $wellKnown;
+        $this->main = $main;
+    }
+
+    /**
+     * handle nodeinfo request
+     *
+     * @param string[] $paths path of us
+     * @return bool true on success
+     */
+    public function exec($paths)
+    {
+        $data = [
+            'fqdn' => $_SERVER['SERVER_NAME']
+        ];
+        $template = null;
+        if (sizeof($paths) == 2 && $paths[0] === '.well-known' && $paths[1] === 'nodeinfo') {
+            $template = 'nodeinfo.json';
+        } else {
+            if ($paths[0] !== 'nodeinfo') {
+                throw new \Federator\Exceptions\FileNotFound();
+            }
+        }
+        if ($template === null) {
+            switch ($paths[1]) {
+                case '2.1':
+                    $template = 'nodeinfo2.1.json';
+                    break;
+                default:
+                    $template = 'nodeinfo2.0.json';
+            }
+            $stats = \Federator\DIO\Stats::getStats($this->main);
+            echo "fetch usercount via connector\n";
+            $data['usercount'] = $stats->userCount;
+            $data['postcount'] = $stats->postCount;
+            $data['commentcount'] = $stats->commentCount;
+        }
+        $tpl = $this->main->renderTemplate($template, $data);
+        $this->wellKnown->setResponse($tpl);
+        return true;
+    }
+}
diff --git a/php/federator/cache/cache.php b/php/federator/cache/cache.php
index 2678705..fa1fae8 100644
--- a/php/federator/cache/cache.php
+++ b/php/federator/cache/cache.php
@@ -13,6 +13,14 @@ namespace Federator\Cache;
  */
 interface Cache extends \Federator\Connector\Connector
 {
+    /**
+     * save remote stats
+     *
+     * @param \Federator\Data\Stats $stats stats to save
+     * @return void
+     */
+    public function saveRemoteStats($stats);
+
     /**
      * save remote user by given name
      *
diff --git a/php/federator/connector/connector.php b/php/federator/connector/connector.php
index 17474e5..e877111 100644
--- a/php/federator/connector/connector.php
+++ b/php/federator/connector/connector.php
@@ -29,4 +29,11 @@ interface Connector
      * @return \Federator\Data\User | false
      */
     public function getRemoteUserBySession(string $_session, string $_user);
+
+    /**
+     * get statistics from remote system
+     *
+     * @return \Federator\Data\Stats|false
+     */
+    public function getRemoteStats();
 }
diff --git a/php/federator/data/stats.php b/php/federator/data/stats.php
new file mode 100644
index 0000000..f122bce
--- /dev/null
+++ b/php/federator/data/stats.php
@@ -0,0 +1,70 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2024 Sascha Nitsch (grumpydeveloper) https://contentnation.net/@grumpydevelop
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * @author Sascha Nitsch (grumpydeveloper)
+ **/
+
+namespace Federator\Data;
+
+/**
+ * storage class for statistics
+ */
+class Stats
+{
+    /**
+     * user count on the external system
+     *
+     * @var int $userCount
+     */
+    public $userCount;
+
+    /**
+     * post count on the external system
+     *
+     * @var int $postCount
+     */
+    public $postCount;
+
+    /**
+     * comment count on the external system
+     *
+     * @var int $commentCount
+     */
+    public $commentCount;
+
+    /**
+     * create new user object from json string
+     *
+     * @param string $input input string
+     * @return Stats
+     */
+    public static function createFromJson($input)
+    {
+        $stats = new Stats();
+        $data = json_decode($input, true);
+        if ($data === null) {
+            return $stats;
+        }
+        $stats->userCount = $data['userCount'];
+        $stats->postCount = $data['postCount'];
+        $stats->commentCount = $data['commentCount'];
+        return $stats;
+    }
+
+    /**
+     * convert internal data to json string
+     *
+     * @return string
+     */
+    public function toJson()
+    {
+        $data = [
+          'userCount' => $this->userCount,
+          'postCount' => $this->postCount,
+          'commentCount' => $this->commentCount
+        ];
+        return json_encode($data) | '';
+    }
+}
diff --git a/php/federator/dio/stats.php b/php/federator/dio/stats.php
new file mode 100644
index 0000000..ac905cf
--- /dev/null
+++ b/php/federator/dio/stats.php
@@ -0,0 +1,45 @@
+<?php
+/**
+ * SPDX-FileCopyrightText: 2024 Sascha Nitsch (grumpydeveloper) https://contentnation.net/@grumpydevelop
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * @author Sascha Nitsch (grumpydeveloper)
+ **/
+
+namespace Federator\DIO;
+
+/**
+ * IO functions related to stats
+ */
+class Stats
+{
+
+    /**
+     * get remote stats
+     *
+     * @param \Federator\Main $main
+     *          main instance
+     * @return \Federator\Data\Stats
+     */
+    public static function getStats($main)
+    {
+        $cache = $main->getCache();
+        // ask cache
+        if ($cache !== null) {
+            $stats = $cache->getRemoteStats();
+            if ($stats !== false) {
+                return $stats;
+            }
+        }
+        $connector = $main->getConnector();
+        // ask connector for stats
+        $stats = $connector->getRemoteStats();
+        if ($cache !== null && $stats !== false) {
+            $cache->saveRemoteStats($stats);
+        }
+        if ($stats === false) {
+            $stats = new \Federator\Data\Stats();
+        }
+        return $stats;
+    }
+}
diff --git a/plugins/federator/contentnation.php b/plugins/federator/contentnation.php
index 1e34b19..05855d6 100644
--- a/plugins/federator/contentnation.php
+++ b/plugins/federator/contentnation.php
@@ -37,6 +37,30 @@ class ContentNation implements Connector
         $this->service = $config['service-uri'];
     }
 
+    /**
+     * get statistics from remote system
+     *
+     * @return \Federator\Data\Stats|false
+     */
+    public function getRemoteStats()
+    {
+        $remoteURL = $this->service . '/api/stats';
+        [$response, $info] = \Federator\Main::getFromRemote($remoteURL, []);
+        if ($info['http_code'] != 200) {
+            print_r($info);
+            return false;
+        }
+        $r = json_decode($response, true);
+        if ($r === false || $r === null || !is_array($r)) {
+            return false;
+        }
+        $stats = new \Federator\Data\Stats();
+        $stats->userCount = array_key_exists('userCount', $r) ? $r['userCount'] : 0;
+        $stats->postCount = array_key_exists('pageCount', $r) ? $r['pageCount'] : 0;
+        $stats->commentCount = array_key_exists('commentCount', $r) ? $r['commentCount'] : 0;
+        return $stats;
+    }
+
    /**
      * get remote user by given name
      *
diff --git a/plugins/federator/dummyconnector.php b/plugins/federator/dummyconnector.php
index 7abb589..9aef028 100644
--- a/plugins/federator/dummyconnector.php
+++ b/plugins/federator/dummyconnector.php
@@ -19,6 +19,20 @@ class DummyConnector implements Connector
     {
     }
 
+    /**
+     * get statistics from remote system
+     *
+     * @return \Federator\Data\Stats|false
+     */
+    public function getRemoteStats()
+    {
+        $stats = new \Federator\Data\Stats();
+        $stats->userCount = 9;
+        $stats->postCount = 11;
+        $stats->commentCount = 13;
+        return $stats;
+    }
+
     /**
      * get remote user by name
      * @param string $_name user or profile name
diff --git a/plugins/federator/rediscache.php b/plugins/federator/rediscache.php
index bec8b19..9e838da 100644
--- a/plugins/federator/rediscache.php
+++ b/plugins/federator/rediscache.php
@@ -77,6 +77,25 @@ class RedisCache implements Cache
         return $prefix . '_' . md5($input);
     }
 
+    /**
+     * get statistics from remote system
+     *
+     * @return \Federator\Data\Stats|false
+     */
+    public function getRemoteStats()
+    {
+        if (!$this->connected) {
+            $this->connect();
+        }
+        $key = 'm_stats';
+        $data = $this->redis->get($key);
+        if ($data === false) {
+            return false;
+        }
+        $stats = \Federator\Data\Stats::createFromJson($data);
+        return $stats;
+    }
+
     /**
      * get remote user by given name
      *
@@ -119,7 +138,22 @@ class RedisCache implements Cache
     }
 
     /**
-     * save remote user by namr
+     * save remote stats
+     *
+     * @param \Federator\Data\Stats $stats stats to save
+     * @return void
+     */
+    public function saveRemoteStats($stats)
+    {
+        if (!$this->connected) {
+            $this->connect();
+        }
+        $key = 'm_stats';
+        $serialized = $stats->toJson();
+        $this->redis->setEx($key, $this->config['statsttl'], $serialized);
+    }
+    /**
+     * save remote user by name
      *
      * @param string $_name user/profile name
      * @param \Federator\Data\User $user user data
@@ -129,7 +163,7 @@ class RedisCache implements Cache
     {
         $key = self::createKey('u', $_name);
         $serialized = $user->toJson();
-        $this->redis->setEx($key, $this->userTTL, $serialized,);
+        $this->redis->setEx($key, $this->userTTL, $serialized);
     }
 
     /**
diff --git a/rediscache.ini b/rediscache.ini
index 2b9f0d5..5d55955 100644
--- a/rediscache.ini
+++ b/rediscache.ini
@@ -4,3 +4,4 @@ port = 6379
 username = federator
 password = redis*change*password
 userttl = 10
+statsttl = 60
diff --git a/templates/federator/nodeinfo.json b/templates/federator/nodeinfo.json
new file mode 100644
index 0000000..9eb2357
--- /dev/null
+++ b/templates/federator/nodeinfo.json
@@ -0,0 +1,8 @@
+{ldelim}
+    "links": [
+        {
+            "rel": "http://nodeinfo.diaspora.software/ns/schema/2.1",
+            "href": "https://{$fqdn}/nodeinfo/2.1"
+        }
+    ]
+ {rdelim}}
\ No newline at end of file
diff --git a/templates/federator/nodeinfo2.0.json b/templates/federator/nodeinfo2.0.json
new file mode 100644
index 0000000..e5f85fb
--- /dev/null
+++ b/templates/federator/nodeinfo2.0.json
@@ -0,0 +1,29 @@
+{ldelim}
+  "version": "2.0",
+  "software": {ldelim}
+    "name": "federator",
+    "version": "1.0.0",
+  {rdelim},
+  "protocols": [
+    "activitypub"
+  ],
+  "relay": "none",
+  "services": {ldelim}
+    "inbound": [],
+    "outbound": [
+      "atom1.0",
+      "rss2.0"
+    ]
+  {rdelim},
+  "openRegistrations": true,
+  "usage": {ldelim}
+    "users": {ldelim}
+      "total": {$usercount}
+{*      "activeMonth": activemonth,
+      "activeHalfyear": activehalfyear *}
+    {rdelim},
+    "localPosts": {$postcount},
+    "localComments": {$commentcount}
+  {rdelim},
+  "metadata": {ldelim}{rdelim}
+{rdelim}
diff --git a/templates/federator/nodeinfo2.1.json b/templates/federator/nodeinfo2.1.json
new file mode 100644
index 0000000..c515ddd
--- /dev/null
+++ b/templates/federator/nodeinfo2.1.json
@@ -0,0 +1,30 @@
+{ldelim}
+  "version": "2.1",
+  "software": {ldelim}
+    "name": "federator",
+    "version": "1.0.0",
+    "repository": "https://git.contentnation.net/grumpydevelop/federator"
+  {rdelim},
+  "protocols": [
+    "activitypub"
+  ],
+  "relay": "none",
+  "services": {ldelim}
+    "inbound": [],
+    "outbound": [
+      "atom1.0",
+      "rss2.0"
+    ]
+  {rdelim},
+  "openRegistrations": true,
+  "usage": {ldelim}
+    "users": {ldelim}
+      "total": {$usercount}
+{*      "activeMonth": activemonth,
+      "activeHalfyear": activehalfyear *}
+    {rdelim},
+    "localPosts": {$postcount},
+    "localComments": {$commentcount}
+  {rdelim},
+  "metadata": {ldelim}{rdelim}
+{rdelim}