Merge pull request #10599 from annando/subscription

API: First steps to support subscriptions

database.sql

@@ -1,6 +1,6 @@
 -- ------------------------------------------
 -- Friendica 2021.09-dev (Siberian Iris)
--- DB_UPDATE_VERSION 1433
+-- DB_UPDATE_VERSION 1434
 -- ------------------------------------------
 
 
@@ -1472,6 +1472,30 @@ CREATE TABLE IF NOT EXISTS `storage` (
 	 PRIMARY KEY(`id`)
 ) DEFAULT COLLATE utf8mb4_general_ci COMMENT='Data stored by Database storage backend';
 
+--
+-- TABLE subscription
+--
+CREATE TABLE IF NOT EXISTS `subscription` (
+	`id` int unsigned NOT NULL auto_increment COMMENT 'Auto incremented image data id',
+	`application-id` int unsigned NOT NULL COMMENT '',
+	`uid` mediumint unsigned NOT NULL COMMENT 'Owner User id',
+	`endpoint` varchar(511) COMMENT 'Endpoint URL',
+	`pubkey` varchar(127) COMMENT 'User agent public key',
+	`secret` varchar(32) COMMENT 'Auth secret',
+	`follow` boolean COMMENT '',
+	`favourite` boolean COMMENT '',
+	`reblog` boolean COMMENT '',
+	`mention` boolean COMMENT '',
+	`poll` boolean COMMENT '',
+	`follow_request` boolean COMMENT '',
+	`status` boolean COMMENT '',
+	 PRIMARY KEY(`id`),
+	 UNIQUE INDEX `application-id_uid` (`application-id`,`uid`),
+	 INDEX `uid_application-id` (`uid`,`application-id`),
+	FOREIGN KEY (`application-id`) REFERENCES `application` (`id`) ON UPDATE RESTRICT ON DELETE CASCADE,
+	FOREIGN KEY (`uid`) REFERENCES `user` (`uid`) ON UPDATE RESTRICT ON DELETE CASCADE
+) DEFAULT COLLATE utf8mb4_general_ci COMMENT='Push Subscription for the API';
+
 --
 -- TABLE userd
 --

doc/API-Mastodon.md

@@ -93,7 +93,13 @@ These endpoints use the [Mastodon API entities](https://docs.joinmastodon.org/en
 - [`POST /api/v1/notifications/clear`](https://docs.joinmastodon.org/methods/notifications/)
 - [`POST /api/v1/notifications/:id/dismiss`](https://docs.joinmastodon.org/methods/notifications/)
 - [`GET /api/v1/preferences`](https://docs.joinmastodon.org/methods/accounts/preferences/)
+- [`DELETE /api/v1/push/subscription`](https://docs.joinmastodon.org/methods/notifications/push/)
+- [`GET /api/v1/push/subscription`](https://docs.joinmastodon.org/methods/notifications/push/)
+- [`PUSH /api/v1/push/subscription`](https://docs.joinmastodon.org/methods/notifications/push/)
+- [`PUT /api/v1/push/subscription`](https://docs.joinmastodon.org/methods/notifications/push/)
 - [`GET /api/v1/scheduled_statuses`](https://docs.joinmastodon.org/methods/statuses/scheduled_statuses/)
+- [`DELETE /api/v1/scheduled_statuses/:id`](https://docs.joinmastodon.org/methods/statuses/scheduled_statuses/)
+- [`GET /api/v1/scheduled_statuses/:id`](https://docs.joinmastodon.org/methods/statuses/scheduled_statuses/)
 - [`GET /api/v1/search`](https://docs.joinmastodon.org/methods/search/)
 - [`POST /api/v1/statuses`](https://docs.joinmastodon.org/methods/statuses/)
 - [`GET /api/v1/statuses/:id`](https://docs.joinmastodon.org/methods/statuses/)
@@ -173,13 +179,7 @@ They refer to features or data that don't exist in Friendica yet.
 - [`POST /api/v1/markers`](https://docs.joinmastodon.org/methods/timelines/markers/)
 - [`GET /api/v1/polls/:id`](https://docs.joinmastodon.org/methods/statuses/polls/)
 - [`POST /api/v1/polls/:id/votes`](https://docs.joinmastodon.org/methods/statuses/polls/)
-- [`DELETE /api/v1/push/subscription`](https://docs.joinmastodon.org/methods/notifications/push/)
-- [`GET /api/v1/push/subscription`](https://docs.joinmastodon.org/methods/notifications/push/)
-- [`PUSH /api/v1/push/subscription`](https://docs.joinmastodon.org/methods/notifications/push/)
-- [`PUT /api/v1/push/subscription`](https://docs.joinmastodon.org/methods/notifications/push/)
 - [`POST /api/v1/reports`](https://docs.joinmastodon.org/methods/accounts/reports/)
-- [`GET /api/v1/scheduled_statuses/:id`](https://docs.joinmastodon.org/methods/statuses/scheduled_statuses/)
 - [`PUT /api/v1/scheduled_statuses/:id`](https://docs.joinmastodon.org/methods/statuses/scheduled_statuses/)
-- [`DELETE /api/v1/scheduled_statuses/:id`](https://docs.joinmastodon.org/methods/statuses/scheduled_statuses/)
 - [`GET /api/v1/streaming`](https://docs.joinmastodon.org/methods/timelines/streaming/)
 - [`DELETE /api/v1/suggestions/:id`](https://docs.joinmastodon.org/methods/accounts/suggestions/)

doc/database.md

@@ -65,6 +65,7 @@ Database Tables
 | [search](help/database/db_search) |  |
 | [session](help/database/db_session) | web session storage |
 | [storage](help/database/db_storage) | Data stored by Database storage backend |
+| [subscription](help/database/db_subscription) | Push Subscription for the API |
 | [tag](help/database/db_tag) | tags and mentions |
 | [user](help/database/db_user) | The local users |
 | [user-contact](help/database/db_user-contact) | User specific public contact data |

doc/database/db_subscription.md

@@ -0,0 +1,42 @@
+Table subscription
+===========
+
+Push Subscription for the API
+
+Fields
+------
+
+| Field          | Description                    | Type               | Null | Key | Default | Extra          |
+| -------------- | ------------------------------ | ------------------ | ---- | --- | ------- | -------------- |
+| id             | Auto incremented image data id | int unsigned       | NO   | PRI | NULL    | auto_increment |
+| application-id |                                | int unsigned       | NO   |     | NULL    |                |
+| uid            | Owner User id                  | mediumint unsigned | NO   |     | NULL    |                |
+| endpoint       | Endpoint URL                   | varchar(511)       | YES  |     | NULL    |                |
+| pubkey         | User agent public key          | varchar(127)       | YES  |     | NULL    |                |
+| secret         | Auth secret                    | varchar(32)        | YES  |     | NULL    |                |
+| follow         |                                | boolean            | YES  |     | NULL    |                |
+| favourite      |                                | boolean            | YES  |     | NULL    |                |
+| reblog         |                                | boolean            | YES  |     | NULL    |                |
+| mention        |                                | boolean            | YES  |     | NULL    |                |
+| poll           |                                | boolean            | YES  |     | NULL    |                |
+| follow_request |                                | boolean            | YES  |     | NULL    |                |
+| status         |                                | boolean            | YES  |     | NULL    |                |
+
+Indexes
+------------
+
+| Name               | Fields                      |
+| ------------------ | --------------------------- |
+| PRIMARY            | id                          |
+| application-id_uid | UNIQUE, application-id, uid |
+| uid_application-id | uid, application-id         |
+
+Foreign Keys
+------------
+
+| Field | Target Table | Target Field |
+|-------|--------------|--------------|
+| application-id | [application](help/database/db_application) | id |
+| uid | [user](help/database/db_user) | uid |
+
+Return to [database documentation](help/database)

src/DI.php

@@ -319,6 +319,14 @@ abstract class DI
 		return self::$dice->create(Factory\Api\Mastodon\ScheduledStatus::class);
 	}
 
+	/**
+	 * @return Factory\Api\Mastodon\Subscription
+	 */
+	public static function mstdnSubscription()
+	{
+		return self::$dice->create(Factory\Api\Mastodon\Subscription::class);
+	}
+
 	/**
 	 * @return Factory\Api\Mastodon\ListEntity
 	 */

src/Factory/Api/Mastodon/Notification.php

@@ -23,10 +23,7 @@ namespace Friendica\Factory\Api\Mastodon;
 
 use Friendica\BaseFactory;
 use Friendica\Database\Database;
-use Friendica\Model\Contact;
-use Friendica\Model\Post;
-use Friendica\Model\Verb;
-use Friendica\Protocol\Activity;
+use Friendica\Model\Notification as ModelNotification;
 use Psr\Log\LoggerInterface;
 
 class Notification extends BaseFactory
@@ -62,22 +59,8 @@ class Notification extends BaseFactory
 		status         = Someone you enabled notifications for has posted a status
 		*/
 
-		if (($notification['vid'] == Verb::getID(Activity::FOLLOW)) && ($notification['type'] == Post\UserNotification::NOTIF_NONE)) {
-			$contact = Contact::getById($notification['actor-id'], ['pending']);
-			$type    = $contact['pending'] ? $type    = 'follow_request' : 'follow';
-		} elseif (($notification['vid'] == Verb::getID(Activity::ANNOUNCE)) &&
-			in_array($notification['type'], [Post\UserNotification::NOTIF_DIRECT_COMMENT, Post\UserNotification::NOTIF_DIRECT_THREAD_COMMENT])) {
-			$type = 'reblog';
-		} elseif (in_array($notification['vid'], [Verb::getID(Activity::LIKE), Verb::getID(Activity::DISLIKE)]) &&
-			in_array($notification['type'], [Post\UserNotification::NOTIF_DIRECT_COMMENT, Post\UserNotification::NOTIF_DIRECT_THREAD_COMMENT])) {
-			$type = 'favourite';
-		} elseif ($notification['type'] == Post\UserNotification::NOTIF_SHARED) {
-			$type = 'status';
-		} elseif (in_array($notification['type'], [Post\UserNotification::NOTIF_EXPLICIT_TAGGED,
-			Post\UserNotification::NOTIF_IMPLICIT_TAGGED, Post\UserNotification::NOTIF_DIRECT_COMMENT,
-			Post\UserNotification::NOTIF_DIRECT_THREAD_COMMENT, Post\UserNotification::NOTIF_THREAD_COMMENT])) {
-			$type = 'mention';
-		} else {
+		$type = ModelNotification::getType($notification);
+		if (empty($type)) {
 			return null;
 		}
 

src/Factory/Api/Mastodon/Subscription.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * @copyright Copyright (C) 2010-2021, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Factory\Api\Mastodon;
+
+use Friendica\BaseFactory;
+use Friendica\Database\DBA;
+use Friendica\Model\Subscription as ModelSubscription;
+
+class Subscription extends BaseFactory
+{
+	/**
+	 * @param int $applicationid Application Id
+	 * @param int $uid           Item user
+	 *
+	 * @return \Friendica\Object\Api\Mastodon\Status
+	 */
+	public function createForApplicationIdAndUserId(int $applicationid, int $uid): \Friendica\Object\Api\Mastodon\Subscription
+	{
+		$subscription = DBA::selectFirst('subscription', [], ['application-id' => $applicationid, 'uid' => $uid]);
+		return new \Friendica\Object\Api\Mastodon\Subscription($subscription, ModelSubscription::getVapidKey());
+	}
+}

src/Model/Notification.php

@@ -25,6 +25,7 @@ use Friendica\BaseModel;
 use Friendica\Content\Text\BBCode;
 use Friendica\Database\Database;
 use Friendica\Network\HTTPException\InternalServerErrorException;
+use Friendica\Protocol\Activity;
 use Psr\Log\LoggerInterface;
 
 /**
@@ -123,4 +124,34 @@ class Notification extends BaseModel
 
 		return $message;
 	}
+
+	/**
+	 * Fetch the notification type for the given notification
+	 *
+	 * @param array $notification 
+	 * @return string
+	 */
+	public static function getType(array $notification): string
+	{
+		if (($notification['vid'] == Verb::getID(Activity::FOLLOW)) && ($notification['type'] == Post\UserNotification::NOTIF_NONE)) {
+			$contact = Contact::getById($notification['actor-id'], ['pending']);
+			$contact['pending'] ? $type = 'follow_request' : 'follow';
+		} elseif (($notification['vid'] == Verb::getID(Activity::ANNOUNCE)) &&
+			in_array($notification['type'], [Post\UserNotification::NOTIF_DIRECT_COMMENT, Post\UserNotification::NOTIF_DIRECT_THREAD_COMMENT])) {
+			$type = 'reblog';
+		} elseif (in_array($notification['vid'], [Verb::getID(Activity::LIKE), Verb::getID(Activity::DISLIKE)]) &&
+			in_array($notification['type'], [Post\UserNotification::NOTIF_DIRECT_COMMENT, Post\UserNotification::NOTIF_DIRECT_THREAD_COMMENT])) {
+			$type = 'favourite';
+		} elseif ($notification['type'] == Post\UserNotification::NOTIF_SHARED) {
+			$type = 'status';
+		} elseif (in_array($notification['type'], [Post\UserNotification::NOTIF_EXPLICIT_TAGGED,
+			Post\UserNotification::NOTIF_IMPLICIT_TAGGED, Post\UserNotification::NOTIF_DIRECT_COMMENT,
+			Post\UserNotification::NOTIF_DIRECT_THREAD_COMMENT, Post\UserNotification::NOTIF_THREAD_COMMENT])) {
+			$type = 'mention';
+		} else {
+			return '';
+		}
+
+		return $type;
+	}
 }

src/Model/Post/UserNotification.php

@@ -30,6 +30,7 @@ use Friendica\Database\DBStructure;
 use Friendica\DI;
 use Friendica\Model\Contact;
 use Friendica\Model\Post;
+use Friendica\Model\Subscription;
 use Friendica\Util\Strings;
 use Friendica\Model\Tag;
 use Friendica\Protocol\Activity;
@@ -297,7 +298,14 @@ class UserNotification
 			$fields['target-uri-id'] = $item['uri-id'];
 		}
 
-		return DBA::insert('notification', $fields, Database::INSERT_IGNORE);
+		$ret = DBA::insert('notification', $fields, Database::INSERT_IGNORE);
+		if ($ret) {
+			$id = DBA::lastInsertId();
+			if (!empty($id)) {
+				Subscription::pushByNotificationId($id);
+			}
+		}
+		return $ret;
 	}
 
 	/**
@@ -318,7 +326,14 @@ class UserNotification
 			'created' => DateTimeFormat::utcNow(),
 		];
 
-		return DBA::insert('notification', $fields, Database::INSERT_IGNORE);
+		$ret = DBA::insert('notification', $fields, Database::INSERT_IGNORE);
+		if ($ret) {
+			$id = DBA::lastInsertId();
+			if (!empty($id)) {
+				Subscription::pushByNotificationId($id);
+			}
+		}
+		return $ret;
 	}
 
 	/**

src/Model/Subscription.php

@@ -0,0 +1,137 @@
+<?php
+/**
+ * @copyright Copyright (C) 2010-2021, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+ /**
+  * @see https://github.com/web-push-libs/web-push-php
+  * Possibly we should simply use this.
+  */
+
+namespace Friendica\Model;
+
+use Friendica\Core\Logger;
+use Friendica\Database\DBA;
+use Friendica\DI;
+use Friendica\Util\Crypto;
+
+class Subscription
+{
+	/**
+	 * Select a subscription record exists
+	 *
+	 * @param int   $applicationid
+	 * @param int   $uid
+	 * @param array $fields
+	 *
+	 * @return bool Does it exist?
+	 */
+	public static function select(int $applicationid, int $uid, array $fields = [])
+	{
+		return DBA::selectFirst('subscription', $fields, ['application-id' => $applicationid, 'uid' => $uid]);
+	}
+
+	/**
+	 * Check if a subscription record exists
+	 *
+	 * @param int   $applicationid
+	 * @param int   $uid
+	 *
+	 * @return bool Does it exist?
+	 */
+	public static function exists(int $applicationid, int $uid)
+	{
+		return DBA::exists('subscription', ['application-id' => $applicationid, 'uid' => $uid]);
+	}
+
+	/**
+	 * Update a subscription record
+	 *
+	 * @param int   $applicationid
+	 * @param int   $uid
+	 * @param array $fields subscription fields
+	 *
+	 * @return bool result of update
+	 */
+	public static function update(int $applicationid, int $uid, array $fields)
+	{
+		return DBA::update('subscription', $fields, ['application-id' => $applicationid, 'uid' => $uid]);
+	}
+
+	/**
+	 * Insert or replace a subscription record
+	 *
+	 * @param array $fields subscription fields
+	 *
+	 * @return bool result of replace
+	 */
+	public static function replace(array $fields)
+	{
+		return DBA::replace('subscription', $fields);
+	}
+
+	/**
+	 * Delete a subscription record
+	 *
+	 * @param int $applicationid
+	 * @param int $uid
+	 * @return bool
+	 */
+	public static function delete(int $applicationid, int $uid)
+	{
+		return DBA::delete('subscription', ['application-id' => $applicationid, 'uid' => $uid]);
+	}
+
+	/**
+	 * Fetch a VAPID key
+	 *
+	 * @return string
+	 */
+	public static function getVapidKey(): string
+	{
+		$keypair = DI::config()->get('system', 'ec_keypair');
+		if (empty($keypair)) {
+			$keypair = Crypto::newECKeypair();
+			DI::config()->set('system', 'ec_keypair', $keypair);
+		}
+		return $keypair['vapid-public'];
+	}
+
+	/**
+	 * Prepare push notification
+	 *
+	 * @param int $nid
+	 * @return void
+	 */
+	public static function pushByNotificationId(int $nid)
+	{
+		$notification = DBA::selectFirst('notification', [], ['id' => $nid]);
+
+		$type = Notification::getType($notification);
+		if (empty($type)) {
+			return;
+		}
+
+		$subscriptions = DBA::select('subscription', [], ['uid' => $notification['uid'], $type => true]);
+		while ($subscription = DBA::fetch($subscriptions)) {
+			Logger::info('Push notification', ['id' => $subscription['id'], 'uid' => $subscription['uid'], 'type' => $type]);
+		}
+		DBA::close($subscriptions);
+	}
+}

src/Module/Api/Mastodon/Accounts/Followers.php

@@ -49,8 +49,6 @@ class Followers extends BaseApi
 			DI::mstdnError()->RecordNotFound();
 		}
 
-		// @todo provide HTTP link header
-
 		$request = self::getRequest([
 			'max_id'   => 0,  // Return results older than this id
 			'since_id' => 0,  // Return results newer than this id

src/Module/Api/Mastodon/Accounts/Following.php

@@ -49,8 +49,6 @@ class Following extends BaseApi
 			DI::mstdnError()->RecordNotFound();
 		}
 
-		// @todo provide HTTP link header
-
 		$request = self::getRequest([
 			'max_id'   => 0,  // Return results older than this id
 			'since_id' => 0,  // Return results newer than this id

src/Module/Api/Mastodon/Blocks.php

@@ -49,8 +49,6 @@ class Blocks extends BaseApi
 			DI::mstdnError()->RecordNotFound();
 		}
 
-		// @todo provide HTTP link header
-
 		$request = self::getRequest([
 			'max_id'   => 0,  // Return results older than this id
 			'since_id' => 0,  // Return results newer than this id

src/Module/Api/Mastodon/Favourited.php

@@ -43,8 +43,6 @@ class Favourited extends BaseApi
 		self::checkAllowedScope(self::SCOPE_READ);
 		$uid = self::getCurrentUserID();
 
-		// @todo provide HTTP link header
-
 		$request = self::getRequest([
 			'limit'      => 20,    // Maximum number of results to return. Defaults to 20.
 			'min_id'     => 0,     // Return results immediately newer than id

src/Module/Api/Mastodon/Lists/Accounts.php

@@ -62,8 +62,6 @@ class Accounts extends BaseApi
 			DI::mstdnError()->RecordNotFound();
 		}
 
-		// @todo provide HTTP link header
-
 		$request = self::getRequest([
 			'max_id'   => 0,  // Return results older than this id
 			'since_id' => 0,  // Return results newer than this id

src/Module/Api/Mastodon/Mutes.php

@@ -49,8 +49,6 @@ class Mutes extends BaseApi
 			DI::mstdnError()->RecordNotFound();
 		}
 
-		// @todo provide HTTP link header
-
 		$request = self::getRequest([
 			'max_id'   => 0,  // Return results older than this id
 			'since_id' => 0,  // Return results newer than this id

src/Module/Api/Mastodon/PushSubscription.php

@@ -0,0 +1,129 @@
+<?php
+/**
+ * @copyright Copyright (C) 2010-2021, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Module\Api\Mastodon;
+
+use Friendica\Core\Logger;
+use Friendica\Core\System;
+use Friendica\DI;
+use Friendica\Model\Subscription;
+use Friendica\Module\BaseApi;
+
+/**
+ * @see https://docs.joinmastodon.org/methods/notifications/push/
+ */
+class PushSubscription extends BaseApi
+{
+	public static function post(array $parameters = [])
+	{
+		self::checkAllowedScope(self::SCOPE_PUSH);
+		$uid         = self::getCurrentUserID();
+		$application = self::getCurrentApplication();
+
+		$request = self::getRequest([
+			'subscription' => [],
+			'data'         => [],
+		]);
+
+		$subscription = [
+			'application-id' => $application['id'],
+			'uid'            => $uid,
+			'endpoint'       => $request['subscription']['endpoint'] ?? '',
+			'pubkey'         => $request['subscription']['keys']['p256dh'] ?? '',
+			'secret'         => $request['subscription']['keys']['auth'] ?? '',
+			'follow'         => $request['data']['alerts']['follow'] ?? false,
+			'favourite'      => $request['data']['alerts']['favourite'] ?? false,
+			'reblog'         => $request['data']['alerts']['reblog'] ?? false,
+			'mention'        => $request['data']['alerts']['mention'] ?? false,
+			'poll'           => $request['data']['alerts']['poll'] ?? false,
+			'follow_request' => $request['data']['alerts']['follow_request'] ?? false,
+			'status'         => $request['data']['alerts']['status'] ?? false,
+		];
+
+		$ret = Subscription::replace($subscription);
+
+		Logger::info('Subscription stored', ['ret' => $ret, 'subscription' => $subscription]);
+
+		return DI::mstdnSubscription()->createForApplicationIdAndUserId($application['id'], $uid)->toArray();
+	}
+
+	public static function put(array $parameters = [])
+	{
+		self::checkAllowedScope(self::SCOPE_PUSH);
+		$uid         = self::getCurrentUserID();
+		$application = self::getCurrentApplication();
+
+		$request = self::getRequest([
+			'data' => [],
+		]);
+
+		$subscription = Subscription::select($application['id'], $uid, ['id']);
+		if (empty($subscription)) {
+			Logger::info('Subscription not found', ['application-id' => $application['id'], 'uid' => $uid]);
+			DI::mstdnError()->RecordNotFound();
+		}
+
+		$fields = [
+			'follow'         => $request['data']['alerts']['follow'] ?? false,
+			'favourite'      => $request['data']['alerts']['favourite'] ?? false,
+			'reblog'         => $request['data']['alerts']['reblog'] ?? false,
+			'mention'        => $request['data']['alerts']['mention'] ?? false,
+			'poll'           => $request['data']['alerts']['poll'] ?? false,
+			'follow_request' => $request['data']['alerts']['follow_request'] ?? false,
+			'status'         => $request['data']['alerts']['status'] ?? false,
+		];
+
+		$ret = Subscription::update($application['id'], $uid, $fields);
+
+		Logger::info('Subscription updated', ['result' => $ret, 'application-id' => $application['id'], 'uid' => $uid, 'fields' => $fields]);
+
+		return DI::mstdnSubscription()->createForApplicationIdAndUserId($application['id'], $uid)->toArray();
+	}
+
+	public static function delete(array $parameters = [])
+	{
+		self::checkAllowedScope(self::SCOPE_PUSH);
+		$uid         = self::getCurrentUserID();
+		$application = self::getCurrentApplication();
+
+		$ret = Subscription::delete($application['id'], $uid);
+
+		Logger::info('Subscription deleted', ['result' => $ret, 'application-id' => $application['id'], 'uid' => $uid]);
+
+		System::jsonExit([]);
+	}
+
+	public static function rawContent(array $parameters = [])
+	{
+		self::checkAllowedScope(self::SCOPE_PUSH);
+		$uid         = self::getCurrentUserID();
+		$application = self::getCurrentApplication();
+
+		if (!Subscription::exists($application['id'], $uid)) {
+			Logger::info('Subscription not found', ['application-id' => $application['id'], 'uid' => $uid]);
+			DI::mstdnError()->RecordNotFound();
+		}
+
+		Logger::info('Fetch subscription', ['application-id' => $application['id'], 'uid' => $uid]);
+
+		return DI::mstdnSubscription()->createForApplicationIdAndUserId($application['id'], $uid)->toArray();
+	}
+}

src/Object/Api/Mastodon/Subscription.php

@@ -0,0 +1,63 @@
+<?php
+/**
+ * @copyright Copyright (C) 2010-2021, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Object\Api\Mastodon;
+
+use Friendica\BaseDataTransferObject;
+
+/**
+ * Class Subscription
+ *
+ * @see https://docs.joinmastodon.org/entities/pushsubscription
+ */
+class Subscription extends BaseDataTransferObject
+{
+	/** @var string */
+	protected $id;
+	/** @var string|null (URL)*/
+	protected $endpoint;
+	/** @var array */
+	protected $alerts;
+	/** @var string */
+	protected $server_key;
+
+	/**
+	 * Creates a subscription record from an item record.
+	 *
+	 * @param array   $subscription
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
+	 */
+	public function __construct(array $subscription, string $vapid)
+	{
+		$this->id       = (string)$subscription['id'];
+		$this->endpoint = $subscription['endpoint'];
+		$this->alerts   = [
+			'follow'    => $subscription['follow'],
+			'favourite' => $subscription['favourite'],
+			'reblog'    => $subscription['reblog'],
+			'mention'   => $subscription['mention'],
+			'mention'   => $subscription['mention'],
+			'poll'      => $subscription['poll'],
+		];
+
+		$this->server_key = $vapid;
+	}
+}

src/Util/Crypto.php

@@ -21,10 +21,12 @@
 
 namespace Friendica\Util;
 
+use Exception;
 use Friendica\Core\Hook;
 use Friendica\Core\Logger;
 use Friendica\Core\System;
 use Friendica\DI;
+use ParagonIE\ConstantTime\Base64UrlSafe;
 use phpseclib\Crypt\RSA;
 use phpseclib\Math\BigInteger;
 
@@ -150,6 +152,50 @@ class Crypto
 		return $response;
 	}
 
+	/**
+	 * Create a new elliptic curve key pair
+	 *
+	 * @return array with the elements "prvkey", "pubkey", "vapid-public" and "vapid-private"
+	 */
+	public static function newECKeypair()
+	{
+		$openssl_options = [
+			'curve_name'       => 'prime256v1',
+			'private_key_type' => OPENSSL_KEYTYPE_EC
+		];
+
+		$conf = DI::config()->get('system', 'openssl_conf_file');
+		if ($conf) {
+			$openssl_options['config'] = $conf;
+		}
+		$result = openssl_pkey_new($openssl_options);
+
+		if (empty($result)) {
+			throw new Exception('Key creation failed');
+		}
+
+		$response = ['prvkey' => '', 'pubkey' => ''];
+
+		// Get private key
+		openssl_pkey_export($result, $response['prvkey']);
+
+		// Get public key
+		$pkey = openssl_pkey_get_details($result);
+		$response['pubkey'] = $pkey['key'];
+
+		// Create VAPID keys
+		// @see https://github.com/web-push-libs/web-push-php/blob/256a18b2a2411469c94943725fb6eccb9681bd75/src/Utils.php#L60-L62
+		$hexString = '04';
+		$hexString .= str_pad(bin2hex($pkey['ec']['x']), 64, '0', STR_PAD_LEFT);
+		$hexString .= str_pad(bin2hex($pkey['ec']['y']), 64, '0', STR_PAD_LEFT);
+		$response['vapid-public'] = Base64UrlSafe::encode(hex2bin($hexString));
+
+		// @see https://github.com/web-push-libs/web-push-php/blob/256a18b2a2411469c94943725fb6eccb9681bd75/src/VAPID.php
+		$response['vapid-private'] = Base64UrlSafe::encode(hex2bin(str_pad(bin2hex($pkey['ec']['d']), 64, '0', STR_PAD_LEFT)));
+
+		return $response;
+	}
+
 	/**
 	 * Encrypt a string with 'aes-256-cbc' cipher method.
 	 *

static/dbstructure.config.php

@@ -55,7 +55,7 @@
 use Friendica\Database\DBA;
 
 if (!defined('DB_UPDATE_VERSION')) {
-	define('DB_UPDATE_VERSION', 1433);
+	define('DB_UPDATE_VERSION', 1434);
 }
 
 return [
@@ -1492,6 +1492,29 @@ return [
 			"PRIMARY" => ["id"]
 		]
 	],
+	"subscription" => [
+		"comment" => "Push Subscription for the API",
+		"fields" => [
+			"id" => ["type" => "int unsigned", "not null" => "1", "extra" => "auto_increment", "primary" => "1", "comment" => "Auto incremented image data id"],
+			"application-id" => ["type" => "int unsigned", "not null" => "1", "foreign" => ["application" => "id"], "comment" => ""],
+			"uid" => ["type" => "mediumint unsigned", "not null" => "1", "foreign" => ["user" => "uid"], "comment" => "Owner User id"],
+			"endpoint" => ["type" => "varchar(511)", "comment" => "Endpoint URL"],
+			"pubkey" => ["type" => "varchar(127)", "comment" => "User agent public key"],
+			"secret" => ["type" => "varchar(32)", "comment" => "Auth secret"],
+			"follow" => ["type" => "boolean", "comment" => ""],
+			"favourite" => ["type" => "boolean", "comment" => ""],
+			"reblog" => ["type" => "boolean", "comment" => ""],
+			"mention" => ["type" => "boolean", "comment" => ""],
+			"poll" => ["type" => "boolean", "comment" => ""],
+			"follow_request" => ["type" => "boolean", "comment" => ""],
+			"status" => ["type" => "boolean", "comment" => ""],
+		],
+		"indexes" => [
+			"PRIMARY" => ["id"],
+			"application-id_uid" => ["UNIQUE", "application-id", "uid"],
+			"uid_application-id" => ["uid", "application-id"],
+		]
+	],
 	"userd" => [
 		"comment" => "Deleted usernames",
 		"fields" => [

static/routes.config.php

@@ -126,7 +126,7 @@ return [
 			'/polls/{id:\d+}'                    => [Module\Api\Mastodon\Unimplemented::class,            [R::GET         ]], // not supported
 			'/polls/{id:\d+}/votes'              => [Module\Api\Mastodon\Unimplemented::class,            [        R::POST]], // not supported
 			'/preferences'                       => [Module\Api\Mastodon\Preferences::class,              [R::GET         ]],
-			'/push/subscription'                 => [Module\Api\Mastodon\Unimplemented::class,            [R::GET, R::POST, R::PUT, R::DELETE]], // not supported
+			'/push/subscription'                 => [Module\Api\Mastodon\PushSubscription::class,         [R::GET, R::POST, R::PUT, R::DELETE]],
 			'/reports'                           => [Module\Api\Mastodon\Unimplemented::class,            [        R::POST]], // not supported
 			'/scheduled_statuses'                => [Module\Api\Mastodon\ScheduledStatuses::class,        [R::GET         ]],
 			'/scheduled_statuses/{id:\d+}'       => [Module\Api\Mastodon\ScheduledStatuses::class,        [R::GET, R::PUT, R::DELETE]],