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<?php
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/**
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* @file
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* Definition of views_handler_field_node_revision_link.
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*/
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/**
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* Field handler to present a link to a node revision.
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*
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* @ingroup views_field_handlers
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*/
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class views_handler_field_node_revision_link extends views_handler_field_node_link {
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function construct() {
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parent::construct();
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$this->additional_fields['node_vid'] = array('table' => 'node_revision', 'field' => 'vid');
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}
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function access() {
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return user_access('view revisions') || user_access('administer nodes');
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}
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function render_link($data, $values) {
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list($node, $vid) = $this->get_revision_entity($values, 'view');
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if (!isset($vid)) {
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return;
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}
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// Current revision uses the node view path.
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$path = 'node/' . $node->nid;
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if ($node->vid != $vid) {
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$path .= "/revisions/$vid/view";
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}
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$this->options['alter']['make_link'] = TRUE;
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$this->options['alter']['path'] = $path;
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$this->options['alter']['query'] = drupal_get_destination();
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return !empty($this->options['text']) ? $this->options['text'] : t('view');
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}
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/**
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* Returns the revision values of a node.
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*
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* @param object $values
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* An object containing all retrieved values.
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* @param string $op
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* The operation being performed.
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*
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* @return array
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* A numerically indexed array containing the current node object and the
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* revision ID for this row.
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*/
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function get_revision_entity($values, $op) {
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$vid = $this->get_value($values, 'node_vid');
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$node = $this->get_value($values);
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// Unpublished nodes ignore access control.
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$node->status = 1;
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// Ensure user has access to perform the operation on this node.
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if (!node_access($op, $node)) {
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return array($node, NULL);
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}
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return array($node, $vid);
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}
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}
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