#65 simple implementation to allow using an authorization token with WmsLayer

* include leaflet-wms-header plugin (https://github.com/ticinum-aerospace/leaflet-wms-header) to the client bundle
* updated index.js from https://cdn.jsdelivr.net/npm/[email protected]/index.min.js
* new API for WmsLayer allowing creation of the layer with an authorization token

Author: johannest

src/main/java/org/peimari/gleaflet/client/WmsLayer.java

@@ -9,5 +9,25 @@ public static native WmsLayer create(String url, WmsLayerOptions options)
 	/*-{
 		return new $wnd.L.TileLayer.WMS(url, options);
 	}-*/;
+	
+	public static native WmsLayer create(String url, String authorization, String layers, WmsLayerOptions options, Map map)
+	/*-{
+	 	try {
+		    return $wnd.L.TileLayer.wmsHeader(url,
+		       {
+		          layers: layers,
+		          format: 'image/png',
+		          transparent: true
+		       },
+		       [
+		          { header: 'Authorization', value: 'Bearer ' + authorization },
+		          { header: 'Content-Type', value: 'text/plain'}
+		       ],
+		       null
+		     ).addTo(map);
+	    } catch (err) {
+	    	console.error("Error while creating the wms layer with authorization: " + err.message);
+	    }
+	}-*/;
 
 }

src/main/java/org/peimari/gleaflet/client/resources/LeafletClientBundle.java

@@ -20,5 +20,8 @@ public interface LeafletClientBundle extends ClientBundle {
 
     @Source("images/layers-2x.png")
     ImageResource layers2x();
+    
+    @Source("leaflet-wms-header/index.js")
+    TextResource pluginScript();
 
 }

src/main/java/org/peimari/gleaflet/client/resources/LeafletResourceInjector.java

@@ -21,6 +21,7 @@ public static void ensureInjected() {
 	protected void injectResources() {
 		bundle.css().ensureInjected();
 		injectScript(bundle.baseScript().getText());
+		injectScript(bundle.pluginScript().getText());
 		setDefaultMarkerIconPath(getDefaultMarkerDirectory());
 	}