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<?php
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/* $Id: votingapi.module,v 1.45 2007/07/17 05:54:17 eaton Exp $ */
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/**
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* VotingAPI 2.0
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*
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* A generalized voting API for Drupal. Modules can cast votes with
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* arbitrary properties and VotingAPI will total them automatically.
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* Support for basic anonymous voting by IP address, multi-criteria
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* voting, arbitrary aggregation functions, etc.
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*/
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/**
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* Implementation of hook_menu. Adds the url path for the votingapi
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* settings page.
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*/
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function votingapi_menu() {
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$items = array();
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$items['admin/settings/votingapi'] = array(
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'title' => 'Voting API',
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'description' => 'Global settings for the Voting API.',
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'page callback' => 'drupal_get_form',
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'page arguments' => array('votingapi_settings_form'),
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'access callback' => 'user_access',
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'access arguments' => array('administer voting api'),
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'type' => MENU_NORMAL_ITEM
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);
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return $items;
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}
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/**
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* Implementation of hook_init. Loads the Views integration code.
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*/
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function votingapi_init() {
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if (module_exists('views')) {
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require_once(drupal_get_path('module', 'votingapi') .'/votingapi_views.inc');
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}
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}
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/**
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* Implementation of hook_perm
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*/
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function votingapi_perm() {
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return array('administer voting api');
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}
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/**
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* Implementation of hook_cron. Allows db-intensive recalculations
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* to put off until cron-time.
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*/
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function votingapi_cron() {
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if (variable_get('votingapi_calculation_schedule', 'immediate') == 'cron') {
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$time = time();
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$last_cron = variable_get('votingapi_last_cron', 0);
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$result = db_query('SELECT DISTINCT content_type, content_id FROM {votingapi_vote} WHERE timestamp > %d', $last_cron);
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while ($content = db_fetch_object($result)) {
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votingapi_recalculate_results($content->content_type, $content->content_id, TRUE);
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}
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variable_set('votingapi_last_cron', $time);
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}
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}
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function votingapi_settings_form($form_state) {
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$period = array(0 => t('Never'));
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$period += drupal_map_assoc(array(600, 3600, 10800, 21600, 32400, 43200, 86400), 'format_interval');
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$form['votingapi_anonymous_window'] = array(
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'#type' => 'select',
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'#title' => t('Anonymous vote rollover'),
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'#description' => t('The amount of time that must pass before two anonymous votes from the same computer are considered unique. Setting this to \'never\' will eliminate most double-voting, but will make it impossible for multiple anonymous on the same computer (like internet cafe customers) from casting votes.'),
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'#default_value' => variable_get('votingapi_anonymous_window', 3600),
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'#options' => $period
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);
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$form['votingapi_calculation_schedule'] = array(
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'#type' => 'radios',
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'#title' => t('Vote tallying'),
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'#description' => t('On high-traffic sites, administrators can use this setting to postpone the calculation of vote results.'),
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'#default_value' => variable_get('votingapi_calculation_schedule', 'immediate'),
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'#options' => array(
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'immediate' => t('Tally results whenever a vote is cast'),
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'cron' => t('Tally results at cron-time'),
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'manual' => t('Do not tally results automatically: I am using a module that manages its own vote results.')
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),
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);
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return system_settings_form($form);
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}
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/**
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* Cast a vote on a particular piece of content. If a vote already
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* exists, its value is changed. In most cases, this is the function
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* that should be used by external modules.
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*
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* @param $votes
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* A single vote object, or an array of vote objects, with the following
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* properties:
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* $vote->content_type (Optional, defaults to 'node')
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* $vote->content_id (Required)
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* $vote->value_type (Optional, defaults to 'percent')
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* $vote->value (Required)
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* $vote->tag (Optional, defaults to 'vote')
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* $vote->uid (Optional, defaults to current user)
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* $vote->vote_source (Optional, defaults to current IP)
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* $vote->timestamp (Optional, defaults to time())
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* @param $criteria
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* A keyed array used to determine what votes will be deleted
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* when the current vote is cast. If no value is specified, all
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* votes for the current content by the current user will be reset.
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* If an empty array is passed in, no votes will be reset and all
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* incoming votes will be saved IN ADDITION to existing ones.
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* $criteria['vote_id'] (If this is set, all other keyes are skipped)
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* $criteria['content_type']
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* $criteria['content_type']
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* $criteria['value_type']
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* $criteria['tag']
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* $criteria['uid']
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* $criteria['vote_source']
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* $criteria['timestamp'] (If this is set, records with timestamps
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* GREATER THAN the set value will be selected.)
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* @return
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* An array of vote result records affected by the vote. The values
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* are contained in a nested array keyed thusly:
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* $value = $results[$content_type][$content_id][$tag][$value_type][$function]
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* If $silent is TRUE, this array will be empty.
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*/
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function votingapi_set_vote($votes = array(), $criteria = NULL) {
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if (is_object($votes)) {
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$votes = array($votes);
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}
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$touched = array();
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foreach($votes as $key => $vote) {
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// First nuke existing votes by this user.
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$vote = _votingapi_prep_vote($vote);
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if (!isset($criteria)) {
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$criteria = votingapi_current_user_identifier();
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$criteria += (array)$vote;
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}
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if (!empty($criteria)) {
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votingapi_delete_votes(votingapi_select_votes($criteria));
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}
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$votes[$key] = votingapi_add_votes($vote);
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$touched[$vote->content_type][$vote->content_id] = TRUE;
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}
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if (variable_get('votingapi_calculation_schedule', 'immediate') != 'cron') {
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foreach($touched as $type => $ids) {
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foreach ($ids as $id => $bool) {
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$touched[$type][$id] = votingapi_recalculate_results($type, $id);
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}
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}
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}
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return $touched;
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}
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/**
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* Generate a proper identifier for the current user: if they have
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* an account, return their UID. Otherwise, return their IP address.
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*/
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function votingapi_current_user_identifier() {
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global $user;
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$criteria = array();
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if ($user->uid) {
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$criteria['uid'] = $user->uid;
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}
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else {
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$criteria['vote_source'] = ip_address();
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}
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return $criteria;
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}
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/**
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* Save a single vote to the database.
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*
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* @param $vobj
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* An array of vote objects with the following properties:
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* $vote->content_type (Optional, defaults to 'node')
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* $vote->content_id (Required)
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* $vote->value_type (Optional, defaults to 'percent')
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* $vote->value (Required)
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* $vote->tag (Optional, defaults to 'vote')
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* $vote->uid (Optional, defaults to current user)
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* $vote->vote_source (Optional, defaults to current IP)
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* $vote->timestamp (Optional, defaults to time())
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* @return
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* The same vote objects, with vote_ids property populated.
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*/
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function votingapi_add_votes($votes = array()) {
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if (is_object($votes)) {
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$votes = array($votes);
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}
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foreach ($votes as $vobj) {
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$vobj = _votingapi_prep_vote($vobj);
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db_query("INSERT INTO {votingapi_vote} (content_type, content_id, value, value_type, tag, uid, timestamp, vote_source) VALUES ('%s', %d, %f, '%s', '%s', %d, %d, '%s')",
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$vobj->content_type, $vobj->content_id, $vobj->value, $vobj->value_type, $vobj->tag, $vobj->uid, $vobj->timestamp, $vobj->vote_source);
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$vobj->vote_id = db_last_insert_id('votingapi_vote', 'vote_id');
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}
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module_invoke_all('votingapi_insert', $votes);
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return $votes;
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}
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/**
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* Save a single vote result to the database.
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*
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* @param robj
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* An array of vote result objects with the following properties:
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* $robj->content_type
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* $robj->content_id
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* $robj->value_type
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* $robj->value
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* $robj->tag
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* $robj->function
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* $robj->timestamp (Optional, defaults to time())
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*/
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function votingapi_add_results($vote_results = array()) {
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if (is_object($vote_results)) {
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$vote_results = array($vote_results);
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}
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foreach ($vote_results as $robj) {
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$robj->timestamp = time();
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db_query("INSERT INTO {votingapi_cache} (content_type, content_id, value, value_type, tag, function, timestamp) VALUES ('%s', %d, %f, '%s', '%s', '%s', %d)",
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$robj->content_type, $robj->content_id, $robj->value, $robj->value_type, $robj->tag, $robj->function, $robj->timestamp);
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}
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}
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/**
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* Delete votes from the database.
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*
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* @param $votes
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* An array of vote objects to delete. Minimally, each object must
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* have the vote_id property set.
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*/
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function votingapi_delete_votes($votes = array()) {
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if (!empty($votes)) {
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module_invoke_all('votingapi_delete', $votes);
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$vids = array();
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foreach ($votes as $vote) {
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$vids[] = $vote->vote_id;
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}
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db_query("DELETE FROM {votingapi_vote} WHERE vote_id IN (". implode(',', array_fill(0, count($vids), '%d')) .")", $vids);
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}
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}
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/**
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* Delete cached vote results from the database.
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*
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* @param $vote_results
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* An array of vote result objects to delete. Minimally, each object
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* must have the vote_cache_id property set.
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*/
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function votingapi_delete_results($vote_results = array()) {
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if (!empty($vote_results)) {
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$vids = array();
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foreach ($vote_results as $vote) {
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$vids[] = $vote->vote_cache_id;
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}
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db_query("DELETE FROM {votingapi_cache} WHERE vote_cache_id IN (". implode(',', array_fill(0, count($vids), '%d')) .")", $vids);
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}
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}
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/**
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* Select individual votes from the database.
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*
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* @param $criteria
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* A keyed array used to build the select query. Keys can contain
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* a single value or an array of values to be matched.
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* $criteria['vote_id'] (If this is set, all other keyes are skipped)
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* $criteria['content_id']
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* $criteria['content_type']
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* $criteria['value_type']
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* $criteria['tag']
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* $criteria['uid']
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* $criteria['vote_source']
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* $criteria['timestamp'] (If this is set, records with timestamps
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* GREATER THAN the set value will be selected.)
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* @return
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* An array of vote objects matching the criteria.
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*/
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function votingapi_select_votes($criteria = array()) {
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if (!empty($criteria['vote_source'])) {
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$criteria['timestamp'] = time() - variable_get('votingapi_anonymous_window', 3600);
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}
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$votes = array();
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$result = _votingapi_query('vote', $criteria);
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while ($vote = db_fetch_object($result)) {
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$votes[] = $vote;
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}
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return $votes;
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}
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/**
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* Select cached vote results from the database.
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*
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* @param $criteria
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* A keyed array used to build the select query. Keys can contain
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* a single value or an array of values to be matched.
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* $criteria['vote_cache_id'] (If this is set, all other keyes are skipped)
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* $criteria['content_type']
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* $criteria['content_type']
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* $criteria['value_type']
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* $criteria['tag']
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* $criteria['uid']
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* $criteria['vote_source']
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* $criteria['timestamp'] (If this is set, records with timestamps
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* GREATER THAN the set value will be selected.)
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* @return
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* An array of vote result objects matching the criteria.
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*/
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function votingapi_select_results($criteria = array()) {
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$cached = array();
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$result = _votingapi_query('cache', $criteria);
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while ($cache = db_fetch_object($result)) {
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$cached[] = $cache;
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}
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return $cached;
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}
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/**
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* Loads all votes for a given piece of content, then calculates and
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* caches the aggregate vote results. This is only intended for modules
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* that have assumed responsibility for the full voting cycle: the
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* votingapi_set_vote() function recalculates automatically.
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*
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* @param $content_type
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* A string identifying the type of content being rated. Node, comment,
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* aggregator item, etc.
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* @param $content_id
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* The key ID of the content being rated.
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* @return
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* An array of the resulting votingapi_cache records, structured thusly:
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* $value = $results[$ag][$value_type][$function]
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*/
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function votingapi_recalculate_results($content_type, $content_id, $force_calculation = FALSE) {
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// if we're operating in cron mode, and the 'force recalculation' flag is NOT set,
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// bail out. The cron run will pick up the results.
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if (variable_get('votingapi_calculation_schedule', 'immediate') != 'cron' || $force_calculation == TRUE) {
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// blow away the existing cache records.
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$criteria = array('content_type' => $content_type, 'content_id' => $content_id);
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$old_cache = votingapi_select_results($criteria);
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votingapi_delete_results($old_cache);
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$votes = votingapi_select_votes($criteria);
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$cache = array();
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// Loop through, calculate per-type and per-tag totals, etc.
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foreach ($votes as $vote) {
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switch ($vote->value_type) {
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case 'percent':
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$cache[$vote->tag][$vote->value_type]['count'] += 1;
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$cache[$vote->tag][$vote->value_type]['sum'] += $vote->value;
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break;
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case 'points':
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$cache[$vote->tag][$vote->value_type]['count'] += 1;
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$cache[$vote->tag][$vote->value_type]['sum'] += $vote->value;
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break;
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case 'option':
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$cache[$vote->tag][$vote->value_type][$vote->value] += 1;
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break;
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}
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}
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// Do a quick loop through to calculate averages.
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| 376 |
// This is also a good example of how external modules can do their own processing.
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foreach ($cache as $tag => $types) {
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foreach ($types as $type => $functions) {
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if ($type == 'percent' || $type == 'points') {
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$cache[$tag][$type]['average'] = $functions['sum'] / $functions['count'];
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}
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if ($type == 'percent') {
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// we don't actually need the sum for this. discard it to avoid cluttering the db.
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unset($cache[$tag][$type]['sum']);
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}
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}
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}
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// Give other modules a chance to alter the collection of votes.
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drupal_alter('votingapi_results', $cache, $votes, $content_type, $content_id);
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// Now, do the caching. Woo.
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foreach ($cache as $tag => $types) {
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foreach ($types as $type => $functions) {
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foreach ($functions as $function => $value) {
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$cached[] = (object) array(
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'content_type' => $content_type,
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'content_id' => $content_id,
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'value_type' => $type,
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'value' => $value,
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'tag' => $tag,
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'function' => $function,
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);
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}
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}
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}
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votingapi_add_results($cached);
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// Give other modules a chance to act on the results of the vote totaling.
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module_invoke_all('votingapi_results', $cached, $votes, $content_type, $content_id);
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return $cached;
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}
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| 414 |
}
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| 415 |
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/**
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| 418 |
* Simple wrapper function for votingapi_select_votes. Returns the
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| 419 |
* value of the first vote matching the criteria passed in.
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*/
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function votingapi_select_single_vote_value($criteria = array()) {
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| 422 |
if ($votes = votingapi_select_votes($criteria) && !empty($votes)) {
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| 423 |
return $votes[0]->value;
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}
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| 425 |
}
|
| 426 |
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| 427 |
/**
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| 428 |
* Simple wrapper function for votingapi_select_results. Returns the
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| 429 |
* value of the first result matching the criteria passed in.
|
| 430 |
*/
|
| 431 |
function votingapi_select_single_result_value($criteria = array()) {
|
| 432 |
return db_result(_votingapi_query('cache', $criteria, 1));
|
| 433 |
}
|
| 434 |
|
| 435 |
/**
|
| 436 |
* Populate the value of any unset vote properties.
|
| 437 |
*
|
| 438 |
* @param $vobj
|
| 439 |
* A single vote object.
|
| 440 |
* @return
|
| 441 |
* A vote object with all required properties filled in with
|
| 442 |
* their default values.
|
| 443 |
*/
|
| 444 |
function _votingapi_prep_vote($vobj) {
|
| 445 |
global $user;
|
| 446 |
if (empty($vobj->prepped)) {
|
| 447 |
$varray = (array)$vobj;
|
| 448 |
$vote = array();
|
| 449 |
$vote['content_type'] = 'node';
|
| 450 |
$vote['value_type'] = 'percent';
|
| 451 |
$vote['tag'] = 'vote';
|
| 452 |
$vote['uid'] = $user->uid;
|
| 453 |
$vote['timestamp'] = time();
|
| 454 |
$vote['vote_source'] = ip_address();
|
| 455 |
$vote['prepped'] = TRUE;
|
| 456 |
|
| 457 |
$varray += $vote;
|
| 458 |
return (object)$varray;
|
| 459 |
}
|
| 460 |
return $vobj;
|
| 461 |
}
|
| 462 |
|
| 463 |
function _votingapi_query($table = 'vote', $criteria = array(), $limit = 0) {
|
| 464 |
$criteria += array(
|
| 465 |
'vote_id' => NULL,
|
| 466 |
'vote_cache_id' => NULL,
|
| 467 |
'content_id' => NULL,
|
| 468 |
'content_type' => NULL,
|
| 469 |
'value_type' => NULL,
|
| 470 |
'value' => NULL,
|
| 471 |
'tag' => NULL,
|
| 472 |
'uid' => NULL,
|
| 473 |
'timestamp' => NULL,
|
| 474 |
'vote_source' => NULL,
|
| 475 |
'function' => NULL,
|
| 476 |
);
|
| 477 |
|
| 478 |
$query = "SELECT * FROM {votingapi_". $table ."} v WHERE 1 = 1";
|
| 479 |
$args = array();
|
| 480 |
if (!empty($criteria['vote_id'])) {
|
| 481 |
_votingapi_query_builder('vote_id', $criteria['vote_id'], $query, $args);
|
| 482 |
} elseif (!empty($criteria['vote_cache_id'])) {
|
| 483 |
_votingapi_query_builder('vote_cache_id', $criteria['vote_cache_id'], $query, $args);
|
| 484 |
} else {
|
| 485 |
_votingapi_query_builder('content_type', $criteria['content_type'], $query, $args, TRUE);
|
| 486 |
_votingapi_query_builder('content_id', $criteria['content_id'], $query, $args);
|
| 487 |
_votingapi_query_builder('value_type', $criteria['value_type'], $query, $args, TRUE);
|
| 488 |
_votingapi_query_builder('tag', $criteria['tag'], $query, $args, TRUE);
|
| 489 |
_votingapi_query_builder('function', $criteria['function'], $query, $args);
|
| 490 |
_votingapi_query_builder('uid', $criteria['uid'], $query, $args);
|
| 491 |
_votingapi_query_builder('vote_source', $criteria['vote_source'], $query, $args, TRUE);
|
| 492 |
_votingapi_query_builder('timestamp', $criteria['timestamp'], $query, $args);
|
| 493 |
}
|
| 494 |
return $limit ? db_query_range($query, $args, 0, $limit) : db_query($query, $args);
|
| 495 |
}
|
| 496 |
|
| 497 |
function _votingapi_query_builder($name, $value, &$query, &$args, $col_is_string = FALSE) {
|
| 498 |
if (!isset($value)) {
|
| 499 |
// Do nothing
|
| 500 |
}
|
| 501 |
elseif ($name === 'timestamp') {
|
| 502 |
$query .= " AND v.timestamp >= %d";
|
| 503 |
$args[] = $value;
|
| 504 |
}
|
| 505 |
else {
|
| 506 |
if (is_array($value)) {
|
| 507 |
if ($col_is_string) {
|
| 508 |
$query .= " AND v.". $name ." IN ('". array_fill(1, count($value), "'%s'") ."')";
|
| 509 |
$args += $value;
|
| 510 |
}
|
| 511 |
else {
|
| 512 |
$query .= " AND v.". $name ." IN (". array_fill(1, count($value), "%d") .")";
|
| 513 |
$args += $value;
|
| 514 |
}
|
| 515 |
} else {
|
| 516 |
if ($col_is_string) {
|
| 517 |
$query .= " AND v.". $name ." = '%s'";
|
| 518 |
$args[] = $value;
|
| 519 |
}
|
| 520 |
else {
|
| 521 |
$query .= " AND v.". $name ." = %d";
|
| 522 |
$args[] = $value;
|
| 523 |
}
|
| 524 |
}
|
| 525 |
}
|
| 526 |
}
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