tag history extension from bzchan, with some minor holes plugged, and add_x_block -> add_block. Now committing files rather than a symlink \o/
git-svn-id: file:///home/shish/svn/shimmie2/trunk@204 7f39781d-f577-437e-ae19-be835c7a54ca
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shish
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219
contrib/tag_history/main.php
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contrib/tag_history/main.php
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<?php
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class Tag_History extends Extension {
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public function receive_event($event) {
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if(is_a($event, 'InitExtEvent')) {
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// shimmie is being installed so call install to create the table.
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global $config;
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if($config->get_int("ext_tag_history_version") < 1) {
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$this->install();
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}
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}
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if(is_a($event, 'PageRequestEvent') && ($event->page == "tag_history"))
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{
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if($event->get_arg(0) == "revert")
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{
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// this is a request to revert to a previous version of the tags
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$this->process_revert_request($_POST['image_id'], $_POST['revert']);
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}
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else
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{
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// must be an attempt to view a tag history
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$image_id = int_escape($event->get_arg(0));
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global $page;
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global $config;
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$page_heading = "Tag History: $image_id";
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$page->set_title("Image $image_id Tag History");
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$page->set_heading($page_heading);
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$page->add_block(new NavBlock());
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$page->add_block(new Block("Tag History", $this->build_tag_history($image_id), "main", 10));
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}
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}
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if(is_a($event, 'DisplayingImageEvent'))
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{
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// handle displaying a link on the view page
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global $page;
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$page->add_block(new Block(null, $this->build_link($event->image->id), "main", 5));
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}
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if(is_a($event, 'ImageDeletionEvent'))
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{
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// handle removing of history when an image is deleted
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$this->delete_all_tag_history($event->image->id);
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}
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if(is_a($event, 'SetupBuildingEvent')) {
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$sb = new SetupBlock("Tag History");
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$sb->add_label("Limit to ");
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$sb->add_int_option("history_limit");
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$sb->add_label(" entires per image");
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$event->panel->add_block($sb);
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}
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if(is_a($event, 'ConfigSaveEvent')) {
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$event->config->set_int_from_post("history_limit");
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}
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if(is_a($event, 'TagSetEvent')) {
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$this->add_tag_history($event->image_id);
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}
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}
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protected function install()
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{
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global $database;
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global $config;
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$database->Execute("CREATE TABLE tag_histories
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(
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id integer NOT NULL auto_increment PRIMARY KEY,
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image_id integer NOT NULL,
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tags text NOT NULL
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)");
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$config->set_int("ext_tag_history_version", 1);
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}
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private function process_revert_request($image_id, $revert_id)
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{
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// this function is called when a revert request is received
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global $page;
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// check for the nothing case
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if($revert_id=="nothing")
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{
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// tried to set it too the same thing so ignore it (might be a bot)
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// go back to the index page with you
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$page->set_mode("redirect");
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$page->set_redirect(make_link("index"));
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return;
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}
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$revert_id = int_escape($revert_id);
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$image_id = int_escape($image_id);
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// lets get this revert id assuming it exists
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$result = $this->get_tag_history_from_revert($revert_id);
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if($result==null)
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{
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// there is no history entry with that id so either the image was deleted
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// while the user was viewing the history, someone is playing with form
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// variables or we have messed up in code somewhere.
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die("Error: No tag history with specified id was found.");
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}
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// lets get the values out of the result
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$stored_result_id = $result->fields['id'];
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$stored_image_id = $result->fields['image_id'];
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$stored_tags = $result->fields['tags'];
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if($image_id!=$stored_image_id)
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{
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// wth is going on there ids should be the same otherwise we are trying
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// to edit another image... banhammer this user... j/k
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die("Error: Mismatch in history image ids.");
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}
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// all should be ok so we can revert by firing the SetUserTags event.
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send_event(new TagSetEvent($image_id, $stored_tags));
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// all should be done now so redirect the user back to the image
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$page->set_mode("redirect");
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$page->set_redirect(make_link("post/view/$image_id"));
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}
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private function build_tag_history($image_id)
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{
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// this function is called when user tries to view tag history of an image
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// check if the image exists
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global $database;
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$image = $database->get_image($image_id);
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if($image==null)return "<strong>No image with the specified id currently exists</strong>";
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// get the current images tags
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$current_tags = html_escape(implode(' ', $image->get_tag_array()));
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//$current_tags = $image->cached_tags;
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// get any stored tag histories
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$result = $this->get_tag_history_from_id($image_id);
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$html = "<div style='text-align: left'>";
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$html .= "<br><form enctype='multipart/form-data' action='".make_link("tag_history/revert")."' method='POST'>\n";
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$html .= "<input type='hidden' name='image_id' value='$image_id'>\n";
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$html .= "<ul style='list-style-type:none;'>\n";
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$html .= "<li><input type='radio' name='revert' value='nothing' checked>$current_tags (<strong>current</strong>)<br></li>\n";
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$end_string = "<input type='submit' value='Revert'></ul></form></div>";
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// check for no stored history
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if($result==null) return $html.$end_string;
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// process each one
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while(!$result->EOF)
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{
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$fields = $result->fields;
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$current_id = $fields['id'];
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$current_tags = $fields['tags'];
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$html .= "<li><input type='radio' name='revert' value='$current_id'>$current_tags<br></li>\n";
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$result->MoveNext();
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}
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$html .= $end_string;
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// now return the finished html
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return $html;
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}
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public function get_tag_history_from_revert($revert_id)
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{
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global $database;
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$row = $database->execute( "SELECT * FROM tag_histories WHERE id = ?", array($revert_id));
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return ($row ? $row : null);
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}
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public function get_tag_history_from_id($image_id)
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{
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global $database;
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$row = $database->execute( "SELECT * FROM tag_histories WHERE image_id = ? ORDER BY id DESC", array($image_id));
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return ($row ? $row : null);
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}
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private function build_link($image_id)
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{
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// this function is called when a user is viewing an image
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return "<a href='".make_link("tag_history/$image_id")."'>Tag History</a>\n";
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}
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private function delete_all_tag_history($image_id)
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{
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// this function is called when an image has been deleted
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global $database;
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$database->execute("DELETE FROM tag_histories WHERE image_id = ?", array($image_id));
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}
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private function add_tag_history($image_id)
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{
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// this function is called just before an images tag are changed
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global $database;
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global $config;
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// get the old tags
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$image = $database->get_image($image_id);
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$tags = $image->get_tag_array();
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if(count($tags)==0)return;
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$tags = implode(' ',$tags);
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// add a history entry
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$allowed = $config->get_int("history_limit",10);
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if($allowed<=0)return;
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$row = $database->execute("INSERT INTO tag_histories(image_id, tags) VALUES (?, ?)", array($image_id, $tags));
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$entries = $database->db->GetOne("SELECT COUNT(*) FROM `tag_histories` WHERE image_id = ?", array($image_id));
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// if needed remove oldest one
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if($entries > $allowed)
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{
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// TODO: Make these queries better
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$min_id = $database->db->GetOne("SELECT MIN(id) FROM tag_histories WHERE image_id = ?", array($image_id));
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$database->execute("DELETE FROM tag_histories WHERE id = ?", array($min_id));
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}
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}
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}
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add_event_listener(new Tag_History(), 40); // early, so that old tags can be archived before new ones are set
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?>
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