fix these two issues garbo notated

Author: RedMan13

src/compiler/jsexecute.js

@@ -599,7 +599,8 @@ runtimeFunctions.tan = `const tan = (angle) => {
 runtimeFunctions.resolveImageURL = `const resolveImageURL = imgURL => 
     typeof imgURL === 'object' && imgURL.type === 'canvas'
         ? Promise.resolve(imgURL.canvas)
-        : new Promise(resolve => {
+        : new Promise(async resolve => {
+            if (!await vm.securityManager.canFetch(imgUrl)) return resolve(imgURL);
             const image = new Image();
             image.crossOrigin = "anonymous";
             image.onload = resolve(image);

src/extensions/gsa_canvas/index.js

@@ -2249,15 +2249,15 @@ class canvas {
                     code +=     `textMeasure = ${ctx}.measureText(text);\n`;
                     code +=     `${cache}[text + ${ctx}.font] = textMeasure;\n`;
                     code += '}\n';
-                    code += 'return textMeasure.';
+                    code += 'return textMeasure[';
                     switch (node.prop) {
                     case 'height': 
-                        code += `actualBoundingBoxAscent + textMeasure.actualBoundingBoxDescent`;
+                        code += `'actualBoundingBoxAscent'] + textMeasure['actualBoundingBoxDescent'`;
                         break;
                     default:
-                        code += node.prop;
+                        code += JSON.stringify(node.prop);
                     }
-                    code += `;})(${text})`;
+                    code += `];})(${text})`;
 
                     return new TypedInput(code, TYPE_NUMBER);
                 }