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diff --git a/www/wiki/extensions/Maps/src/GoogleMapsService.php b/www/wiki/extensions/Maps/src/GoogleMapsService.php
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+++ b/www/wiki/extensions/Maps/src/GoogleMapsService.php
@@ -0,0 +1,314 @@
+<?php
+
+namespace Maps;
+
+use Html;
+
+/**
+ * @licence GNU GPL v2+
+ * @author Jeroen De Dauw < jeroendedauw@gmail.com >
+ * @author Peter Grassberger < petertheone@gmail.com >
+ */
+class GoogleMapsService implements MappingService {
+
+	/**
+	 * Maps user input map types to the Google Maps names for the map types.
+	 */
+	private const MAP_TYPES = [
+		'normal' => 'ROADMAP',
+		'roadmap' => 'ROADMAP',
+		'satellite' => 'SATELLITE',
+		'hybrid' => 'HYBRID',
+		'terrain' => 'TERRAIN',
+		'physical' => 'TERRAIN',
+		'earth' => 'earth'
+	];
+
+	private const TYPE_CONTROL_STYLES = [
+		'default' => 'DEFAULT',
+		'horizontal' => 'HORIZONTAL_BAR',
+		'dropdown' => 'DROPDOWN_MENU'
+	];
+
+	private $addedDependencies = [];
+
+	public function getName(): string {
+		return 'googlemaps3';
+	}
+
+	public function getAliases(): array {
+		return [ 'googlemaps', 'google' ];
+	}
+
+	public function hasAlias( string $alias ): bool {
+		return in_array( $alias, [ 'googlemaps', 'google' ] );
+	}
+
+	public function getParameterInfo(): array {
+		global $egMapsGMaps3Type, $egMapsGMaps3Types, $egMapsGMaps3Controls, $egMapsGMaps3Layers;
+		global $egMapsGMaps3DefTypeStyle, $egMapsGMaps3DefZoomStyle, $egMapsGMaps3AutoInfoWindows;
+		global $egMapsResizableByDefault;
+
+		$params = [];
+
+		$params['zoom'] = [
+			'type' => 'integer',
+			'range' => [ 0, 20 ],
+			'default' => $GLOBALS['egMapsGMaps3Zoom'],
+			'message' => 'maps-par-zoom',
+		];
+
+		$params['type'] = [
+			'default' => $egMapsGMaps3Type,
+			'values' => self::getTypeNames(),
+			'message' => 'maps-googlemaps3-par-type',
+			'post-format' => function ( $value ) {
+				return GoogleMapsService::MAP_TYPES[strtolower( $value )];
+			},
+		];
+
+		$params['types'] = [
+			'dependencies' => 'type',
+			'default' => $egMapsGMaps3Types,
+			'values' => self::getTypeNames(),
+			'message' => 'maps-googlemaps3-par-types',
+			'islist' => true,
+			'post-format' => function ( array $value ) {
+				foreach ( $value as &$part ) {
+					$part = self::MAP_TYPES[strtolower( $part )];
+				}
+
+				return $value;
+			},
+		];
+
+		$params['layers'] = [
+			'default' => $egMapsGMaps3Layers,
+			'values' => [
+				'traffic',
+				'bicycling',
+				'transit'
+			],
+			'message' => 'maps-googlemaps3-par-layers',
+			'islist' => true,
+		];
+
+		$params['controls'] = [
+			'default' => $egMapsGMaps3Controls,
+			'values' => [
+				'pan',
+				'zoom',
+				'type',
+				'scale',
+				'streetview',
+				'rotate'
+			],
+			'message' => 'maps-googlemaps3-par-controls',
+			'islist' => true,
+			'post-format' => function ( $value ) {
+				return array_map( 'strtolower', $value );
+			},
+		];
+
+		$params['zoomstyle'] = [
+			'default' => $egMapsGMaps3DefZoomStyle,
+			'values' => [ 'default', 'small', 'large' ],
+			'message' => 'maps-googlemaps3-par-zoomstyle',
+			'post-format' => 'strtoupper',
+		];
+
+		$params['typestyle'] = [
+			'default' => $egMapsGMaps3DefTypeStyle,
+			'values' => array_keys( self::TYPE_CONTROL_STYLES ),
+			'message' => 'maps-googlemaps3-par-typestyle',
+			'post-format' => function ( $value ) {
+				return self::TYPE_CONTROL_STYLES[strtolower( $value )];
+			},
+		];
+
+		$params['autoinfowindows'] = [
+			'type' => 'boolean',
+			'default' => $egMapsGMaps3AutoInfoWindows,
+			'message' => 'maps-googlemaps3-par-autoinfowindows',
+		];
+
+		$params['resizable'] = [
+			'type' => 'boolean',
+			'default' => $egMapsResizableByDefault,
+			'message' => 'maps-par-resizable',
+		];
+
+		$params['kmlrezoom'] = [
+			'type' => 'boolean',
+			'default' => $GLOBALS['egMapsRezoomForKML'],
+			'message' => 'maps-googlemaps3-par-kmlrezoom',
+		];
+
+		$params['poi'] = [
+			'type' => 'boolean',
+			'default' => $GLOBALS['egMapsShowPOI'],
+			'message' => 'maps-googlemaps3-par-poi',
+		];
+
+		$params['markercluster'] = [
+			'type' => 'boolean',
+			'default' => false,
+			'message' => 'maps-par-markercluster',
+		];
+
+		$params['clustergridsize'] = [
+			'type' => 'integer',
+			'default' => 60,
+			'message' => 'maps-googlemaps3-par-clustergridsize',
+		];
+
+		$params['clustermaxzoom'] = [
+			'type' => 'integer',
+			'default' => 20,
+			'message' => 'maps-par-clustermaxzoom',
+		];
+
+		$params['clusterzoomonclick'] = [
+			'type' => 'boolean',
+			'default' => true,
+			'message' => 'maps-par-clusterzoomonclick',
+		];
+
+		$params['clusteraveragecenter'] = [
+			'type' => 'boolean',
+			'default' => true,
+			'message' => 'maps-googlemaps3-par-clusteraveragecenter',
+		];
+
+		$params['clusterminsize'] = [
+			'type' => 'integer',
+			'default' => 2,
+			'message' => 'maps-googlemaps3-par-clusterminsize',
+		];
+
+		$params['imageoverlays'] = [
+			'type' => 'mapsimageoverlay',
+			'default' => [],
+			'delimiter' => ';',
+			'islist' => true,
+			'message' => 'maps-googlemaps3-par-imageoverlays',
+		];
+
+		$params['kml'] = [
+			'default' => [],
+			'message' => 'maps-par-kml',
+			'islist' => true,
+			'post-format' => function( array $kmlFileNames ) {
+				return array_map(
+					function( string $fileName ) {
+						return wfExpandUrl( MapsFunctions::getFileUrl( $fileName ) );
+					},
+					$kmlFileNames
+				);
+			}
+		];
+
+		$params['gkml'] = [
+			'default' => [],
+			'message' => 'maps-googlemaps3-par-gkml',
+			'islist' => true,
+		];
+
+		$params['searchmarkers'] = [
+			'default' => '',
+			'message' => 'maps-par-searchmarkers',
+			// new CriterionSearchMarkers() FIXME
+		];
+
+		$params['enablefullscreen'] = [
+			'type' => 'boolean',
+			'default' => false,
+			'message' => 'maps-par-enable-fullscreen',
+		];
+
+		$params['scrollwheelzoom'] = [
+			'type' => 'boolean',
+			'default' => false,
+			'message' => 'maps-par-scrollwheelzoom',
+		];
+
+		return $params;
+	}
+
+	/**
+	 * Returns the names of all supported map types.
+	 */
+	private function getTypeNames(): array {
+		return array_keys( self::MAP_TYPES );
+	}
+
+	public function newMapId(): string {
+		static $mapsOnThisPage = 0;
+
+		$mapsOnThisPage++;
+
+		return 'map_google3_' . $mapsOnThisPage;
+	}
+
+	public function getResourceModules(): array {
+		return [ 'ext.maps.googlemaps3', 'ext.sm.googlemaps3ajax' ];
+	}
+
+	public static function getApiScript( $langCode, array $urlArgs = [] ) {
+		$urlArgs = array_merge(
+			[
+				'language' => self::getMappedLanguageCode( $langCode )
+			],
+			$urlArgs
+		);
+		if ( $GLOBALS['egMapsGMaps3ApiKey'] !== '' ) {
+			$urlArgs['key'] = $GLOBALS['egMapsGMaps3ApiKey'];
+		}
+		if ( $GLOBALS['egMapsGMaps3ApiVersion'] !== '' ) {
+			$urlArgs['v'] = $GLOBALS['egMapsGMaps3ApiVersion'];
+		}
+
+		return Html::linkedScript( '//maps.googleapis.com/maps/api/js?' . wfArrayToCgi( $urlArgs ) );
+	}
+
+	/**
+	 * Maps language codes to Google Maps API v3 compatible values.
+	 */
+	private static function getMappedLanguageCode( string $code ): string {
+		$mappings = [
+			'en_gb' => 'en-gb',// v3 supports en_gb - but wants us to call it en-gb
+			'he' => 'iw',      // iw is googlish for hebrew
+			'fj' => 'fil',     // google does not support Fijian - use Filipino as close(?) supported relative
+		];
+
+		if ( array_key_exists( $code, $mappings ) ) {
+			return $mappings[$code];
+		}
+
+		return $code;
+	}
+
+	public function getDependencyHtml( array $params ): string {
+		$dependencies = [];
+
+		// Only add dependencies that have not yet been added.
+		foreach ( $this->getDependencies() as $dependency ) {
+			if ( !in_array( $dependency, $this->addedDependencies ) ) {
+				$dependencies[] = $dependency;
+				$this->addedDependencies[] = $dependency;
+			}
+		}
+
+		// If there are dependencies, put them all together in a string, otherwise return false.
+		return $dependencies !== [] ? implode( '', $dependencies ) : false;
+	}
+
+	private function getDependencies(): array {
+		return [
+			self::getApiScript(
+				is_string( $GLOBALS['egMapsGMaps3Language'] ) ?
+					$GLOBALS['egMapsGMaps3Language'] : $GLOBALS['egMapsGMaps3Language']->getCode()
+			)
+		];
+	}
+}