202 lines
6.9 KiB
PHP
202 lines
6.9 KiB
PHP
<?php
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/*
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* Name: Language Filter
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* Version: 0.1
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* Description: Filters out postings in languages not spoken by the users
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* Author: Tobias Diekershoff <https://f.diekershoff.de/u/tobias>
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* License: MIT
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*/
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use Friendica\App;
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use Friendica\Content\Text\BBCode;
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use Friendica\Core\Hook;
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use Friendica\Core\Renderer;
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use Friendica\DI;
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/* Define the hooks we want to use
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* that is, we have settings, we need to save the settings and we want
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* to modify the content of a posting when friendica prepares it.
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*/
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function langfilter_install()
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{
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Hook::register('prepare_body_content_filter', 'addon/langfilter/langfilter.php', 'langfilter_prepare_body_content_filter', 10);
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Hook::register('addon_settings', 'addon/langfilter/langfilter.php', 'langfilter_addon_settings');
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Hook::register('addon_settings_post', 'addon/langfilter/langfilter.php', 'langfilter_addon_settings_post');
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}
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function langfilter_uninstall()
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{
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Hook::unregister('prepare_body_content_filter', 'addon/langfilter/langfilter.php', 'langfilter_prepare_body_content_filter');
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Hook::unregister('prepare_body', 'addon/langfilter/langfilter.php', 'langfilter_prepare_body');
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Hook::unregister('addon_settings', 'addon/langfilter/langfilter.php', 'langfilter_addon_settings');
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Hook::unregister('addon_settings_post', 'addon/langfilter/langfilter.php', 'langfilter_addon_settings_post');
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}
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/* The settings
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* 1st check if somebody logged in is calling
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* 2nd get the current settings
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* 3rd parse a SMARTY3 template, replacing some translateable strings for the form
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*/
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function langfilter_addon_settings(App $a, &$s)
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{
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if (!local_user()) {
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return;
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}
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$enable_checked = (intval(DI::pConfig()->get(local_user(), 'langfilter', 'disable')) ? '' : ' checked="checked" ');
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$languages = DI::pConfig()->get(local_user(), 'langfilter', 'languages');
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$minconfidence = DI::pConfig()->get(local_user(), 'langfilter', 'minconfidence') * 100;
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$minlength = DI::pConfig()->get(local_user(), 'langfilter', 'minlength');
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$t = Renderer::getMarkupTemplate("settings.tpl", "addon/langfilter/");
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$s .= Renderer::replaceMacros($t, [
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'$title' => DI::l10n()->t("Language Filter"),
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'$intro' => DI::l10n()->t('This addon tries to identify the language posts are writen in. If it does not match any language specifed below, posts will be hidden by collapsing them.'),
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'$enabled' => ['langfilter_enable', DI::l10n()->t('Use the language filter'), $enable_checked, ''],
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'$languages' => ['langfilter_languages', DI::l10n()->t('Able to read'), $languages, DI::l10n()->t('List of abbreviations (iso2 codes) for languages you speak, comma separated. For example "de,it".')],
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'$minconfidence' => ['langfilter_minconfidence', DI::l10n()->t('Minimum confidence in language detection'), $minconfidence, DI::l10n()->t('Minimum confidence in language detection being correct, from 0 to 100. Posts will not be filtered when the confidence of language detection is below this percent value.')],
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'$minlength' => ['langfilter_minlength', DI::l10n()->t('Minimum length of message body'), $minlength, DI::l10n()->t('Minimum number of characters in message body for filter to be used. Posts shorter than this will not be filtered. Note: Language detection is unreliable for short content (<200 characters).')],
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'$submit' => DI::l10n()->t('Save Settings'),
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]);
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return;
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}
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/* Save the settings
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* 1st check it's a logged in user calling
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* 2nd check the langfilter form is to be saved
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* 3rd save the settings to the DB for later usage
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*/
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function langfilter_addon_settings_post(App $a, &$b)
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{
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if (!local_user()) {
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return;
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}
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if (!empty($_POST['langfilter-settings-submit'])) {
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DI::pConfig()->set(local_user(), 'langfilter', 'languages', trim($_POST['langfilter_languages']));
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$enable = (!empty($_POST['langfilter_enable']) ? intval($_POST['langfilter_enable']) : 0);
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$disable = 1 - $enable;
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DI::pConfig()->set(local_user(), 'langfilter', 'disable', $disable);
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$minconfidence = 0 + $_POST['langfilter_minconfidence'];
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if (!$minconfidence) {
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$minconfidence = 0;
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} elseif ($minconfidence < 0) {
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$minconfidence = 0;
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} elseif ($minconfidence > 100) {
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$minconfidence = 100;
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}
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DI::pConfig()->set(local_user(), 'langfilter', 'minconfidence', $minconfidence / 100.0);
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$minlength = 0 + $_POST['langfilter_minlength'];
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if (!$minlength) {
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$minlength = 32;
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} elseif ($minlength < 0) {
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$minlength = 32;
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}
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DI::pConfig()->set(local_user(), 'langfilter', 'minlength', $minlength);
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info(DI::l10n()->t('Language Filter Settings saved.') . EOL);
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}
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}
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/* Actually filter postings by their language
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* 1st check if the user wants to filter postings
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* 2nd get the user settings which languages shall be not filtered out
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* 3rd extract the language of a posting
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* 4th if the determined language does not fit to the spoken languages
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* of the user, then collapse the posting, but provide a link to
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* expand it again.
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*/
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function langfilter_prepare_body_content_filter(App $a, &$hook_data)
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{
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$logged_user = local_user();
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if (!$logged_user) {
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return;
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}
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// Never filter own messages
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// TODO: find a better way to extract this
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$logged_user_profile = DI::baseUrl()->get() . '/profile/' . $a->user['nickname'];
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if ($logged_user_profile == $hook_data['item']['author-link']) {
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return;
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}
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// Don't filter if language filter is disabled
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if (DI::pConfig()->get($logged_user, 'langfilter', 'disable')) {
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return;
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}
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$naked_body = BBCode::toPlaintext($hook_data['item']['body'], false);
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// Don't filter if body lenght is below minimum
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$minlen = DI::pConfig()->get(local_user(), 'langfilter', 'minlength', 32);
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if (!$minlen) {
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$minlen = 32;
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}
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if (strlen($naked_body) < $minlen) {
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return;
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}
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$read_languages_string = DI::pConfig()->get(local_user(), 'langfilter', 'languages');
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$minconfidence = DI::pConfig()->get(local_user(), 'langfilter', 'minconfidence');
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// Don't filter if no spoken languages are configured
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if (!$read_languages_string) {
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return;
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}
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$read_languages_array = explode(',', $read_languages_string);
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// Extract the language of the post
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if (!empty($hook_data['item']['language'])) {
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$languages = json_decode($hook_data['item']['language'], true);
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if (!is_array($languages)) {
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return;
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}
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foreach ($languages as $iso2 => $confidence) {
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break;
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}
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if (empty($iso2)) {
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return;
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}
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$lang = Text_LanguageDetect_ISO639::code2ToName($iso2);
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} else {
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$opts = $hook_data['item']['postopts'];
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if (!$opts) {
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// no options associated to post
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return;
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}
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if (!preg_match('/\blang=([^;]*);([^:]*)/', $opts, $matches)) {
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// no lang options associated to post
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return;
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}
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$lang = $matches[1];
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$confidence = $matches[2];
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$iso2 = Text_LanguageDetect_ISO639::nameToCode2($lang);
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}
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// Do not filter if language detection confidence is too low
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if ($minconfidence && $confidence < $minconfidence) {
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return;
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}
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if (!$iso2) {
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return;
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}
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if (!in_array($iso2, $read_languages_array)) {
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$hook_data['filter_reasons'][] = DI::l10n()->t('Filtered language: %s', ucfirst($lang));
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}
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}
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