Official Addons for the Friendica Communications Platform. (please note that this is a clone of the repository at github, issues are handled there)
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<?php
/**
* Name: Advanced content Filter
* Description: Expression-based content filter
* Version: 1.0
* Author: Hypolite Petovan <https://friendica.mrpetovan.com/profile/hypolite>
* Maintainer: Hypolite Petovan <https://friendica.mrpetovan.com/profile/hypolite>
*
* Copyright (c) 2018 Hypolite Petovan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* * copyright notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
* * Neither the name of Friendica nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL FRIENDICA BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
use Friendica\App;
use Friendica\BaseModule;
use Friendica\Content\Text\Markdown;
use Friendica\Core\Hook;
use Friendica\Core\Logger;
use Friendica\Core\Renderer;
use Friendica\Database\DBA;
use Friendica\Database\DBStructure;
use Friendica\DI;
use Friendica\Model\Item;
use Friendica\Model\Post;
use Friendica\Model\Tag;
use Friendica\Module\Security\Login;
use Friendica\Network\HTTPException;
use Friendica\Util\DateTimeFormat;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Symfony\Component\ExpressionLanguage;
require_once __DIR__ . DIRECTORY_SEPARATOR . 'vendor' . DIRECTORY_SEPARATOR . 'autoload.php';
function advancedcontentfilter_install(App $a)
{
Hook::register('dbstructure_definition' , __FILE__, 'advancedcontentfilter_dbstructure_definition');
Hook::register('prepare_body_content_filter', __FILE__, 'advancedcontentfilter_prepare_body_content_filter');
Hook::register('addon_settings' , __FILE__, 'advancedcontentfilter_addon_settings');
Hook::add('dbstructure_definition' , __FILE__, 'advancedcontentfilter_dbstructure_definition');
DBStructure::performUpdate();
Logger::log("installed advancedcontentfilter");
}
/*
* Hooks
*/
function advancedcontentfilter_dbstructure_definition(App $a, &$database)
{
$database["advancedcontentfilter_rules"] = [
"comment" => "Advancedcontentfilter addon rules",
"fields" => [
"id" => ["type" => "int unsigned", "not null" => "1", "extra" => "auto_increment", "primary" => "1", "comment" => "Auto incremented rule id"],
"uid" => ["type" => "int unsigned", "not null" => "1", "comment" => "Owner user id"],
"name" => ["type" => "varchar(255)", "not null" => "1", "comment" => "Rule name"],
"expression" => ["type" => "mediumtext" , "not null" => "1", "comment" => "Expression text"],
"serialized" => ["type" => "mediumtext" , "not null" => "1", "comment" => "Serialized parsed expression"],
"active" => ["type" => "boolean" , "not null" => "1", "default" => "1", "comment" => "Whether the rule is active or not"],
"created" => ["type" => "datetime" , "not null" => "1", "default" => DBA::NULL_DATETIME, "comment" => "Creation date"],
],
"indexes" => [
"PRIMARY" => ["id"],
"uid_active" => ["uid", "active"],
]
];
}
function advancedcontentfilter_get_filter_fields(array $item)
{
$vars = [];
// Convert the language JSON text into a filterable format
if (!empty($item['language']) && ($languages = json_decode($item['language'], true))) {
foreach ($languages as $key => $value) {
$vars['language_' . strtolower($key)] = $value;
}
}
foreach ($item as $key => $value) {
$vars[str_replace('-', '_', $key)] = $value;
}
ksort($vars);
return $vars;
}
function advancedcontentfilter_prepare_body_content_filter(App $a, &$hook_data)
{
static $expressionLanguage;
if (is_null($expressionLanguage)) {
$expressionLanguage = new ExpressionLanguage\ExpressionLanguage();
}
if (!local_user()) {
return;
}
$vars = advancedcontentfilter_get_filter_fields($hook_data['item']);
$rules = DI::cache()->get('rules_' . local_user());
if (!isset($rules)) {
$rules = DBA::toArray(DBA::select(
'advancedcontentfilter_rules',
['name', 'expression', 'serialized'],
['uid' => local_user(), 'active' => true]
));
DI::cache()->set('rules_' . local_user(), $rules);
}
if ($rules) {
foreach($rules as $rule) {
try {
$serializedParsedExpression = new ExpressionLanguage\SerializedParsedExpression(
$rule['expression'],
$rule['serialized']
);
// The error suppression operator is used because of potentially broken user-supplied regular expressions
$found = (bool) @$expressionLanguage->evaluate($serializedParsedExpression, $vars);
} catch (Exception $e) {
$found = false;
}
if ($found) {
$hook_data['filter_reasons'][] = DI::l10n()->t('Filtered by rule: %s', $rule['name']);
break;
}
}
}
}
function advancedcontentfilter_addon_settings(App $a, &$s)
{
if (!local_user()) {
return;
}
$advancedcontentfilter = DI::l10n()->t('Advanced Content Filter');
$s .= <<<HTML
<span class="settings-block fakelink" style="display: block;"><h3><a href="advancedcontentfilter">$advancedcontentfilter <i class="glyphicon glyphicon-share"></i></a></h3></span>
HTML;
return;
}
/*
* Module
*/
function advancedcontentfilter_module() {}
function advancedcontentfilter_init(App $a)
{
if ($a->argc > 1 && $a->argv[1] == 'api') {
$slim = new \Slim\App();
require __DIR__ . '/src/middlewares.php';
require __DIR__ . '/src/routes.php';
$slim->run();
exit;
}
}
function advancedcontentfilter_content(App $a)
{
if (!local_user()) {
return Login::form('/' . implode('/', $a->argv));
}
if ($a->argc > 1 && $a->argv[1] == 'help') {
$lang = $a->user['language'];
$default_dir = 'addon/advancedcontentfilter/doc/';
$help_file = 'advancedcontentfilter.md';
$help_path = $default_dir . $help_file;
if (file_exists($default_dir . $lang . '/' . $help_file)) {
$help_path = $default_dir . $lang . '/' . $help_file;
}
$content = file_get_contents($help_path);
$html = Markdown::convert($content, false);
$html = str_replace('code>', 'key>', $html);
return $html;
} else {
$t = Renderer::getMarkupTemplate('settings.tpl', 'addon/advancedcontentfilter/');
return Renderer::replaceMacros($t, [
'$messages' => [
'backtosettings' => DI::l10n()->t('Back to Addon Settings'),
'title' => DI::l10n()->t('Advanced Content Filter'),
'add_a_rule' => DI::l10n()->t('Add a Rule'),
'help' => DI::l10n()->t('Help'),
'intro' => DI::l10n()->t('Add and manage your personal content filter rules in this screen. Rules have a name and an arbitrary expression that will be matched against post data. For a complete reference of the available operations and variables, check the help page.'),
'your_rules' => DI::l10n()->t('Your rules'),
'no_rules' => DI::l10n()->t('You have no rules yet! Start adding one by clicking on the button above next to the title.'),
'disabled' => DI::l10n()->t('Disabled'),
'enabled' => DI::l10n()->t('Enabled'),
'disable_this_rule' => DI::l10n()->t('Disable this rule'),
'enable_this_rule' => DI::l10n()->t('Enable this rule'),
'edit_this_rule' => DI::l10n()->t('Edit this rule'),
'edit_the_rule' => DI::l10n()->t('Edit the rule'),
'save_this_rule' => DI::l10n()->t('Save this rule'),
'delete_this_rule' => DI::l10n()->t('Delete this rule'),
'rule' => DI::l10n()->t('Rule'),
'close' => DI::l10n()->t('Close'),
'addtitle' => DI::l10n()->t('Add new rule'),
'rule_name' => DI::l10n()->t('Rule Name'),
'rule_expression' => DI::l10n()->t('Rule Expression'),
'cancel' => DI::l10n()->t('Cancel'),
],
'$current_theme' => $a->getCurrentTheme(),
'$rules' => advancedcontentfilter_get_rules(),
'$form_security_token' => BaseModule::getFormSecurityToken()
]);
}
}
/*
* Common functions
*/
function advancedcontentfilter_build_fields($data)
{
$fields = [];
if (!empty($data['name'])) {
$fields['name'] = $data['name'];
}
if (!empty($data['expression'])) {
$allowed_keys = [
'author_id', 'author_link', 'author_name', 'author_avatar',
'owner_id', 'owner_link', 'owner_name', 'owner_avatar',
'contact_id', 'uid', 'id', 'parent', 'uri',
'thr_parent', 'parent_uri',
'content_warning',
'commented', 'created', 'edited', 'received',
'verb', 'object_type', 'postopts', 'plink', 'guid', 'wall', 'private', 'starred',
'title', 'body',
'file', 'event_id', 'location', 'coord', 'app', 'attach',
'rendered_hash', 'rendered_html', 'object',
'allow_cid', 'allow_gid', 'deny_cid', 'deny_gid',
'item_id', 'item_network', 'author_thumb', 'owner_thumb',
'network', 'url', 'name', 'writable', 'self',
'cid', 'alias',
'event_created', 'event_edited', 'event_start', 'event_finish', 'event_summary',
'event_desc', 'event_location', 'event_type', 'event_nofinish', 'event_adjust', 'event_ignore',
'children', 'pagedrop', 'tags', 'hashtags', 'mentions',
];
$expressionLanguage = new ExpressionLanguage\ExpressionLanguage();
$parsedExpression = $expressionLanguage->parse($data['expression'], $allowed_keys);
$serialized = serialize($parsedExpression->getNodes());
$fields['expression'] = $data['expression'];
$fields['serialized'] = $serialized;
}
if (isset($data['active'])) {
$fields['active'] = intval($data['active']);
} else {
$fields['active'] = 1;
}
return $fields;
}
/*
* API
*/
function advancedcontentfilter_get_rules()
{
if (!local_user()) {
throw new HTTPException\UnauthorizedException(DI::l10n()->t('You must be logged in to use this method'));
}
$rules = DBA::toArray(DBA::select('advancedcontentfilter_rules', [], ['uid' => local_user()]));
return json_encode($rules);
}
function advancedcontentfilter_get_rules_id(ServerRequestInterface $request, ResponseInterface $response, $args)
{
if (!local_user()) {
throw new HTTPException\UnauthorizedException(DI::l10n()->t('You must be logged in to use this method'));
}
$rule = DBA::selectFirst('advancedcontentfilter_rules', [], ['id' => $args['id'], 'uid' => local_user()]);
return json_encode($rule);
}
function advancedcontentfilter_post_rules(ServerRequestInterface $request)
{
if (!local_user()) {
throw new HTTPException\UnauthorizedException(DI::l10n()->t('You must be logged in to use this method'));
}
if (!BaseModule::checkFormSecurityToken()) {
throw new HTTPException\BadRequestException(DI::l10n()->t('Invalid form security token, please refresh the page.'));
}
$data = json_decode($request->getBody(), true);
try {
$fields = advancedcontentfilter_build_fields($data);
} catch (Exception $e) {
throw new HTTPException\BadRequestException($e->getMessage(), $e);
}
if (empty($fields['name']) || empty($fields['expression'])) {
throw new HTTPException\BadRequestException(DI::l10n()->t('The rule name and expression are required.'));
}
$fields['uid'] = local_user();
$fields['created'] = DateTimeFormat::utcNow();
if (!DBA::insert('advancedcontentfilter_rules', $fields)) {
throw new HTTPException\ServiceUnavailableException(DBA::errorMessage());
}
$rule = DBA::selectFirst('advancedcontentfilter_rules', [], ['id' => DBA::lastInsertId()]);
return json_encode(['message' => DI::l10n()->t('Rule successfully added'), 'rule' => $rule]);
}
function advancedcontentfilter_put_rules_id(ServerRequestInterface $request, ResponseInterface $response, $args)
{
if (!local_user()) {
throw new HTTPException\UnauthorizedException(DI::l10n()->t('You must be logged in to use this method'));
}
if (!BaseModule::checkFormSecurityToken()) {
throw new HTTPException\BadRequestException(DI::l10n()->t('Invalid form security token, please refresh the page.'));
}
if (!DBA::exists('advancedcontentfilter_rules', ['id' => $args['id'], 'uid' => local_user()])) {
throw new HTTPException\NotFoundException(DI::l10n()->t('Rule doesn\'t exist or doesn\'t belong to you.'));
}
$data = json_decode($request->getBody(), true);
try {
$fields = advancedcontentfilter_build_fields($data);
} catch (Exception $e) {
throw new HTTPException\BadRequestException($e->getMessage(), $e);
}
if (!DBA::update('advancedcontentfilter_rules', $fields, ['id' => $args['id']])) {
throw new HTTPException\ServiceUnavailableException(DBA::errorMessage());
}
return json_encode(['message' => DI::l10n()->t('Rule successfully updated')]);
}
function advancedcontentfilter_delete_rules_id(ServerRequestInterface $request, ResponseInterface $response, $args)
{
if (!local_user()) {
throw new HTTPException\UnauthorizedException(DI::l10n()->t('You must be logged in to use this method'));
}
if (!BaseModule::checkFormSecurityToken()) {
throw new HTTPException\BadRequestException(DI::l10n()->t('Invalid form security token, please refresh the page.'));
}
if (!DBA::exists('advancedcontentfilter_rules', ['id' => $args['id'], 'uid' => local_user()])) {
throw new HTTPException\NotFoundException(DI::l10n()->t('Rule doesn\'t exist or doesn\'t belong to you.'));
}
if (!DBA::delete('advancedcontentfilter_rules', ['id' => $args['id']])) {
throw new HTTPException\ServiceUnavailableException(DBA::errorMessage());
}
return json_encode(['message' => DI::l10n()->t('Rule successfully deleted')]);
}
function advancedcontentfilter_get_variables_guid(ServerRequestInterface $request, ResponseInterface $response, $args)
{
if (!local_user()) {
throw new HTTPException\UnauthorizedException(DI::l10n()->t('You must be logged in to use this method'));
}
if (!isset($args['guid'])) {
throw new HTTPException\BadRequestException(DI::l10n()->t('Missing argument: guid.'));
}
$condition = ["`guid` = ? AND (`uid` = ? OR `uid` = 0)", $args['guid'], local_user()];
$params = ['order' => ['uid' => true]];
$item = Post::selectFirstForUser(local_user(), [], $condition, $params);
if (!DBA::isResult($item)) {
throw new HTTPException\NotFoundException(DI::l10n()->t('Unknown post with guid: %s', $args['guid']));
}
$tags = Tag::populateFromItem($item);
$item['tags'] = $tags['tags'];
$item['hashtags'] = $tags['hashtags'];
$item['mentions'] = $tags['mentions'];
$return = advancedcontentfilter_get_filter_fields($item);
return json_encode(['variables' => str_replace('\\\'', '\'', var_export($return, true))]);
}