xref: /plugin/spatialhelper/action.php (revision e4020312292687cfe1a51c232888014705999d15)

<?php
/*
 * Copyright (c) 2011-2014 Mark C. Prins <mprins@users.sf.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
if (! defined ( 'DOKU_INC' ))
	die ();
if (! defined ( 'DOKU_PLUGIN' ))
	define ( 'DOKU_PLUGIN', DOKU_INC . 'lib/plugins/' );
if (! defined ( 'DOKU_LF' ))
	define ( 'DOKU_LF', "\n" );
require_once (DOKU_PLUGIN . 'action.php');

/**
 * DokuWiki Plugin dokuwikispatial (Action Component).
 *
 * @license BSD license
 * @author Mark C. Prins <mprins@users.sf.net>
 */
class action_plugin_spatialhelper extends DokuWiki_Action_Plugin {

	/**
	 * Register for events.
	 *
	 * @param Doku_Event_Handler $controller
	 *        	DokuWiki's event controller object. Also available as global $EVENT_HANDLER
	 */
	public function register(Doku_Event_Handler &$controller) {
		// listen for page add / delete events
		// http://www.dokuwiki.org/devel:event:indexer_page_add
		$controller->register_hook ( 'INDEXER_PAGE_ADD', 'BEFORE', $this, 'handle_indexer_page_add' );
		$controller->register_hook ( 'IO_WIKIPAGE_WRITE', 'BEFORE', $this, '_removeFromIndex' );

		// http://www.dokuwiki.org/devel:event:sitemap_generate
		$controller->register_hook ( 'SITEMAP_GENERATE', 'BEFORE', $this, 'handle_sitemap_generate_before' );
		// using after will only trigger us if a sitemap was actually created
		$controller->register_hook ( 'SITEMAP_GENERATE', 'AFTER', $this, 'handle_sitemap_generate_after' );

		// handle actions we know of
		$controller->register_hook ( 'ACTION_ACT_PREPROCESS', 'BEFORE', $this, 'handle_action_act_preprocess', array () );
		$controller->register_hook ( 'TPL_ACT_UNKNOWN', 'BEFORE', $this, '_findnearby', array (
				'format' => 'HTML'
		) );

		$controller->register_hook ( 'AJAX_CALL_UNKNOWN', 'BEFORE', $this, '_findnearby', array (
				'format' => 'JSON'
		) );

		// listen for media uploads and deletes
		$controller->register_hook ( 'MEDIA_UPLOAD_FINISH', 'BEFORE', $this, '_handle_media_uploaded', array () );
		$controller->register_hook ( 'MEDIA_DELETE_FILE', 'BEFORE', $this, '_handle_media_deleted', array () );

		$controller->register_hook ( 'TPL_METAHEADER_OUTPUT', 'BEFORE', $this, 'handle_metaheader_output' );
	}

	/**
	 * Update the spatial index for the page.
	 *
	 * @param Doku_Event $event
	 *        	event object by reference
	 * @param object $param
	 *        	the parameters passed to register_hook when this handler was registered
	 */
	function handle_indexer_page_add(Doku_Event &$event, $param) {
		// $event→data['page'] – the page id
		// $event→data['body'] – empty, can be filled by additional content to index by your plugin
		// $event→data['metadata'] – the metadata that shall be indexed. This is an array where the keys are the metadata indexes and the value a string or an array of strings with the values. title and relation_references will already be set.
		$id = $event->data ['page'];
		$indexer = & plugin_load ( 'helper', 'spatialhelper_index' );
		$entries = $indexer->updateSpatialIndex ( $id );
	}

	/**
	 * Update the spatial index, removing the page.
	 *
	 * @param Doku_Event $event
	 *        	event object by reference
	 * @param object $param
	 *        	the parameters passed to register_hook when this handler was registered
	 */
	function _removeFromIndex(Doku_Event &$event, $param) {
		// event data:
		// $data[0] – The raw arguments for io_saveFile as an array. Do not change file path.
		// $data[0][0] – the file path.
		// $data[0][1] – the content to be saved, and may be modified.
		// $data[1] – ns: The colon separated namespace path minus the trailing page name. (false if root ns)
		// $data[2] – page_name: The wiki page name.
		// $data[3] – rev: The page revision, false for current wiki pages.

		// dbglog ( $event->data, "Event data in _removeFromIndex." );
		if (@file_exists ( $event->data [0] [0] )) {
			// file not new
			if (! $event->data [0] [1]) {
				// file is empty, page is being deleted
				if (empty ( $event->data [1] )) {
					// root namespace
					$id = $event->data [2];
				} else {
					$id = $event->data [1] . ":" . $event->data [2];
				}
				$indexer = & plugin_load ( 'helper', 'spatialhelper_index' );
				if ($indexer) {
					$indexer->deleteFromIndex ( $id );
				}
			}
		}
	}

	/**
	 * Add a new SitemapItem object that points to the KML of public geocoded pages.
	 *
	 * @param Doku_Event $event
	 * @param unknown $param
	 */
	function handle_sitemap_generate_before(Doku_Event &$event, $param) {
		$path = mediaFN ( $this->getConf ( 'media_kml' ) );
		$lastmod = @filemtime ( $path );
		$event->data ['items'] [] = new SitemapItem ( ml ( $this->getConf ( 'media_kml' ), '', true, '&amp;', true ), $lastmod );
		// dbglog ( $event->data ['items'], "Added a new SitemapItem object that points to the KML of public geocoded pages." );
	}

	/**
	 * Create a spatial sitemap or attach the geo/kml map to the sitemap.
	 *
	 * @param Doku_Event $event
	 *        	event object by reference, not used
	 * @param mixed $param
	 *        	parameter array, not used
	 */
	function handle_sitemap_generate_after(Doku_Event &$event, $param) {
		// $event→data['items']: Array of SitemapItem instances, the array of sitemap items that already contains all public pages of the wiki
		// $event→data['sitemap']: The path of the file the sitemap will be saved to.

		// dbglog ($event->data['items'], "createSpatialSitemap loading helper" );
		if ($helper = & plugin_load ( 'helper', 'spatialhelper_sitemap' )) {
			// dbglog ( $helper, "createSpatialSitemap loaded helper." );

			$kml = $helper->createKMLSitemap ( $this->getConf ( 'media_kml' ) );
			$rss = $helper->createGeoRSSSitemap ( $this->getConf ( 'media_georss' ) );

			return $kml && $rss;
		} else {
			// dbglog ( $helper, "createSpatialSitemap NOT loaded helper." );
		}
	}

	/**
	 * trap findnearby action.
	 * This addional handler is required as described at: https://www.dokuwiki.org/devel:event:tpl_act_unknown
	 *
	 * @param Doku_Event $event
	 *        	event object by reference
	 * @param mixed $param
	 *        	not used
	 */
	function handle_action_act_preprocess(Doku_Event &$event, $param) {
		if ($event->data != 'findnearby')
			return;
		$event->preventDefault ();
	}

	/**
	 * handle findnearby action.
	 *
	 * @param Doku_Event $event
	 *        	event object by reference
	 * @param mixed $param
	 *        	associative array with keys
	 *        	'format'=> HTML | JSON
	 */
	function _findnearby(Doku_Event &$event, $param) {
		if ($event->data != 'findnearby')
			return;
		$event->preventDefault ();

		global $INPUT;
		$dist_prefix = '';
		if ($helper = & plugin_load ( 'helper', 'spatialhelper_search' )) {
			if ($INPUT->has ( 'geohash' )) {
				$results = $helper->findNearby ( $INPUT->str ( 'geohash' ) );
				$dist_prefix = hsc ( $this->getLang ( 'result_distance_prefix' ) ) . ' ';
			} elseif ($INPUT->has ( 'lat' ) && $INPUT->has ( 'lon' )) {
				$results = $helper->findNearbyLatLon ( $INPUT->param ( 'lat' ), $INPUT->param ( 'lon' ) );
			} else {
				$results = array (
						'error' => hsc ( $this->getLang ( 'invalidinput' ) )
				);
			}
		}

		$showMedia = $INPUT->bool ( 'showMedia', true );

		switch ($param ['format']) {
			case 'JSON' :
				$this->printJSON ( $results );
				break;
			case 'HTML' :
			default :
				$this->printHTML ( $results, $showMedia );
				break;
		}
	}

	/**
	 * Print seachresults as HTML lists.
	 *
	 * @param array $searchresults
	 */
	private function printJSON($searchresults) {
		require_once DOKU_INC . 'inc/JSON.php';
		$json = new JSON ();

		header ( 'Content-Type: application/json' );
		print $json->encode ( $searchresults );
	}

	/**
	 * Print seachresults as HTML lists.
	 *
	 * @param array $searchresults
	 * @param boolean $showMedia
	 */
	private function printHTML($searchresults, $showMedia = true) {
		$pages = ( array ) ($searchresults ['pages']);
		$media = ( array ) $searchresults ['media'];
		$location = ( string ) $searchresults ['latlon'];
		$geohash = ( string ) $searchresults ['geohash'];

		if (isset ( $searchresults ['error'] )) {
			print '<div class="level1"><p>' . hsc ( $results ['error'] ) . '</p></div>';
			return;
		}

		// print a HTML list
		print '<h1>' . $this->getLang ( 'results_header' ) . '</h1>' . DOKU_LF;
		print '<div class="level1">' . DOKU_LF;
		if (! empty ( $pages )) {
			$pagelist = '<ol>' . DOKU_LF;
			foreach ( $pages as $page ) {
				$pagelist .= '<li>' . html_wikilink ( ':' . $page ['id'], useHeading ( 'navigation' ) ? null : noNS ( $page ['id'] ) ) . ' (' . $this->getLang ( 'results_distance_prefix' ) . $page ['distance'] . 'm) ' . $page ['description'] . '</li>' . DOKU_LF;
			}
			$pagelist .= '</ol>' . DOKU_LF;

			print '<h2>' . $this->getLang ( 'results_pages' ) . hsc ( ' lat,lon: ' . $location . ' (geohash: ' . $geohash . ')' ) . '</h2>';
			print '<div class="level2">' . DOKU_LF;
			print $pagelist;
			print '<p>Precision: ' . $searchresults ['precision'] . ' m</p>' . DOKU_LF;
			print '</div>' . DOKU_LF;
		} else {
			print '<p>' . hsc ( $this->getLang ( 'nothingfound' ) ) . '</p>';
		}

		if (! empty ( $media ) && $showMedia) {
			$pagelist = '<ol>' . DOKU_LF;
			foreach ( $media as $m ) {
				$opts = array ();
				$link = ml ( $m ['id'], $opts, false, '&amp;', false );
				$opts ['w'] = '100';
				$src = ml ( $m ['id'], $opts );
				$pagelist .= '<li><a href="' . $link . '"><img src="' . $src . '"></a> (' . $this->getLang ( 'results_distance_prefix' ) . $page ['distance'] . 'm) ' . hsc ( $desc ) . '</li>' . DOKU_LF;
			}
			$pagelist .= '</ol>' . DOKU_LF;

			print '<h2>' . $this->getLang ( 'results_media' ) . hsc ( ' lat,lon: ' . $location . ' (geohash: ' . $geohash . ')' ) . '</h2>' . DOKU_LF;
			print '<div class="level2">' . DOKU_LF;
			print $pagelist;
			print '<p>Precision: ' . $searchresults ['precision'] . ' m</p>' . DOKU_LF;
			print '</div>' . DOKU_LF;
		}
		print '</div>' . DOKU_LF;
	}

	/**
	 * add media to spatial index.
	 *
	 * @param Doku_Event $event
	 *        	event object by reference
	 * @param unknown $param
	 */
	function _handle_media_uploaded(Doku_Event &$event, $param) {
		// data[0] temporary file name (read from $_FILES)
		// data[1] file name of the file being uploaded
		// data[2] future directory id of the file being uploaded
		// data[3] the mime type of the file being uploaded
		// data[4] true if the uploaded file exists already
		// data[5] (since 2011-02-06) the PHP function used to move the file to the correct location

		// dbglog ( $event->data, "_handle_media_uploaded::event data" );

		// check the list of mimetypes
		// if it's a supported type call appropriate index function
		if (substr_compare ( $event->data [3], 'image/jpeg', 0 )) {
			$indexer = plugin_load ( 'helper', 'spatialhelper_index' );
			if ($indexer) {
				$indexer->indexImage ( $event->data [2], $event->data [1] );
			}
		}
		// TODO add image/tiff
		// TODO kml, gpx, geojson...
	}

	/**
	 * removes the media from the index.
	 */
	function _handle_media_deleted(Doku_Event &$event, $param) {
		// data['id'] ID data['unl'] unlink return code
		// data['del'] Namespace directory unlink return code
		// data['name'] file name data['path'] full path to the file
		// data['size'] file size

		// dbglog ( $event->data, "_handle_media_deleted::event data" );

		// remove the media id from the index
		$indexer = & plugin_load ( 'helper', 'spatialhelper_index' );
		if ($indexer) {
			$indexer->deleteFromIndex ( 'media__' . $event->data ['id'] );
		}
	}

	/**
	 * add a link to the spatial sitemap files in the header.
	 *
	 * @param Doku_Event $event
	 *        	the DokuWiki event. $event->data is a two-dimensional
	 *        	array of all meta headers. The keys are meta, link and script.
	 * @param unknown_type $param
	 *
	 * @see http://www.dokuwiki.org/devel:event:tpl_metaheader_output
	 */
	public function handle_metaheader_output(Doku_Event &$event, $param) {
		// TODO maybe test for exist
		$event->data ["link"] [] = array (
				"type" => "application/atom+xml",
				"rel" => "alternate",
				"href" => ml ( $this->getConf ( 'media_georss' ) ),
				"title" => "Spatial ATOM Feed"
		);
		$event->data ["link"] [] = array (
				"type" => "application/vnd.google-earth.kml+xml",
				"rel" => "alternate",
				"href" => ml ( $this->getConf ( 'media_kml' ) ),
				"title" => "KML Sitemap"
		);
	}

	/**
	 * Calculate a new coordinate based on start, distance and bearing
	 *
	 * @param $start array
	 *        	- start coordinate as decimal lat/lon pair
	 * @param $dist float
	 *        	- distance in kilometers
	 * @param $brng float
	 *        	- bearing in degrees (compass direction)
	 */
	private function _geo_destination($start, $dist, $brng) {
		$lat1 = _toRad ( $start [0] );
		$lon1 = _toRad ( $start [1] );
		// http://en.wikipedia.org/wiki/Earth_radius
		// average earth radius in km
		$dist = $dist / 6371.01;
		$brng = _toRad ( $brng );

		$lon2 = $lon1 + atan2 ( sin ( $brng ) * sin ( $dist ) * cos ( $lat1 ), cos ( $dist ) - sin ( $lat1 ) * sin ( $lat2 ) );
		$lon2 = fmod ( ($lon2 + 3 * pi ()), (2 * pi ()) ) - pi ();

		return array (
				_toDeg ( $lat2 ),
				_toDeg ( $lon2 )
		);
	}
	private function _toRad($deg) {
		return $deg * pi () / 180;
	}
	private function _toDeg($rad) {
		return $rad * 180 / pi ();
	}
}