140 lines
6.3 KiB
PHP
140 lines
6.3 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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require_once('library/langdet/Text/LanguageDetect.php');
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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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register_hook('prepare_body', 'addon/langfilter/langfilter.php', 'langfilter_prepare_body', 10);
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register_hook('plugin_settings', 'addon/langfilter/langfilter.php', 'langfilter_addon_settings');
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register_hook('plugin_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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unregister_hook('prepare_body', 'addon/langfilter/langfilter.php', 'langfilter_prepare_body');
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unregister_hook('plugin_settings', 'addon/langfilter/langfilter.php', 'langfilter_addon_settings');
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unregister_hook('plugin_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(&$a,&$s) {
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if(! local_user())
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return;
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$enable_checked = (intval(get_pconfig(local_user(),'langfilter','disable')) ? '' : ' checked="checked" ');
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$languages = get_pconfig(local_user(),'langfilter','languages');
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$minconfidence = get_pconfig(local_user(),'langfilter','minconfidence')*100;
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$minlength = get_pconfig(local_user(),'langfilter','minlength');
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if(! $languages)
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$languages = 'en,de,fr,it,es';
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$t = get_markup_template("settings.tpl", "addon/langfilter/" );
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$s .= replace_macros ($t, array(
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'$title' => t("Language Filter"),
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'$intro' => t ('This addon tries to identify the language of a postings. If it does not match any language spoken by you (see below) the posting will be collapsed. Remember detecting the language is not perfect, especially with short postings.'),
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'$enabled' => array('langfilter_enable', t('Use the language filter'), $enable_checked, ''),
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'$languages' => array('langfilter_languages', t('I speak'), $languages, t('List of abbreviations (iso2 codes) for languages you speak, comma separated. For example "de,it".') ),
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'$minconfidence' => array('langfilter_minconfidence', t('Minimum confidence in language detection'), $minconfidence, t('Minimum confidence in language detection being correct, from 0 to 100. Posts will not be filtered when the confidence of language detection is below this percent value.') ),
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'$minlength' => array('langfilter_minlength', t('Minimum length of message body'), $minlength, t('Minimum length of message body for language filter to be used. Posts shorter than this number of characters will not be filtered.') ),
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'$submit' => 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(&$a,&$b) {
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if(! local_user())
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return;
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if($_POST['langfilter-settings-submit']) {
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set_pconfig(local_user(),'langfilter','languages',trim($_POST['langfilter_languages']));
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$enable = ((x($_POST,'langfilter_enable')) ? intval($_POST['langfilter_enable']) : 0);
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$disable = 1-$enable;
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set_pconfig(local_user(),'langfilter','disable', $disable);
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$minconfidence = 0+$_POST['langfilter_minconfidence'];
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if ( ! $minconfidence ) $minconfidence = 0;
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else if ( $minconfidence < 0 ) $minconfidence = 0;
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else if ( $minconfidence > 100 ) $minconfidence = 100;
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set_pconfig(local_user(),'langfilter','minconfidence', $minconfidence/100.0);
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$minlength = 0+$_POST['langfilter_minlength'];
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if ( ! $minlength ) $minlength = 32;
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else if ( $minlength < 0 ) $minlength = 32;
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set_pconfig(local_user(),'langfilter','minlength', $minlength);
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info( t('Language Filter Settings saved.') . EOL);
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}
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}
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/* Actually filter postings by their language
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* 1st check if the user wants to filter postings
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* 2nd get the user settings which languages shall be not filtered out
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* 3rd extract the language of a posting
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* 4th if the determined language does not fit to the spoken languages
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* of the user, then collapse the posting, but provide a link to
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* expand it again.
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*/
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function langfilter_prepare_body(&$a,&$b) {
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$logged_user = local_user();
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if ( ! $logged_user ) return;
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# Never filter own messages
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# TODO: find a better way to extract this
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$logged_user_profile = $a->config['system']['url'] . '/profile/' . $a->user['nickname'];
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if ( $logged_user_profile == $b['item']['author-link'] ) return;
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# Don't filter if language filter is disabled
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if( get_pconfig($logged_user,'langfilter','disable') ) return;
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# Don't filter if body lenght is below minimum
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$minlen = get_pconfig(local_user(),'langfilter','minlength');
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if ( ! $minlen ) $minlen = 32;
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if ( strlen($b['item']['body']) < $minlen ) return;
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$spoken_config = get_pconfig(local_user(),'langfilter','languages');
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$minconfidence = get_pconfig(local_user(),'langfilter','minconfidence');
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# Don't filter if no spoken languages are configured
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if ( ! $spoken_config ) return;
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$spoken_languages = explode(',', $spoken_config);
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# Extract the language of the post
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$opts = $b['item']['postopts'];
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if ( ! $opts ) return; # no options associated to post
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if ( ! preg_match('/\blang=([^;]*);([^:]*)/', $opts, $matches ) )
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return; # no lang options associated to post
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$lang = $matches[1];
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$confidence = $matches[2];
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# Do not filter if language detection confidence is too low
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if ( $minconfidence && $confidence < $minconfidence ) return;
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$iso2 = Text_LanguageDetect_ISO639::nameToCode2($lang);
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if ( ! $iso2 ) return;
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$spoken = in_array($iso2, $spoken_languages);
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if( ! $spoken ) {
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$rnd = random_string(8);
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$b['html'] = '<div id="langfilter-wrap-' . $rnd . '" class="fakelink" onclick=openClose(\'langfilter-' . $rnd . '\'); >' . sprintf( t('unspoken language %s - Click to open/close'),$lang ) . '</div><div id="langfilter-' . $rnd . '" style="display: none; " >' . $b['html'] . '</div>';
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}
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}
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?>
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