Text widget annotations: implement unit testing and sanitize data values

src/core/annotation.js

@@ -671,8 +671,19 @@ var TextWidgetAnnotation = (function TextWidgetAnnotationClosure() {
   function TextWidgetAnnotation(params) {
     WidgetAnnotation.call(this, params);
 
-    this.data.textAlignment = Util.getInheritableProperty(params.dict, 'Q');
-    this.data.maxLen = Util.getInheritableProperty(params.dict, 'MaxLen');
+    // Determine the alignment of text in the field.
+    var alignment = Util.getInheritableProperty(params.dict, 'Q');
+    if (!isInt(alignment) || alignment < 0 || alignment > 2) {
+      alignment = null;
+    }
+    this.data.textAlignment = alignment;
+
+    // Determine the maximum length of text in the field.
+    var maximumLength = Util.getInheritableProperty(params.dict, 'MaxLen');
+    if (!isInt(maximumLength) || maximumLength < 0) {
+      maximumLength = null;
+    }
+    this.data.maxLen = maximumLength;
   }
 
   Util.inherit(TextWidgetAnnotation, WidgetAnnotation, {

src/display/annotation_layer.js

@@ -29,7 +29,6 @@
 
 var AnnotationBorderStyleType = sharedUtil.AnnotationBorderStyleType;
 var AnnotationType = sharedUtil.AnnotationType;
-var isInt = sharedUtil.isInt;
 var Util = sharedUtil.Util;
 var addLinkAttributes = displayDOMUtils.addLinkAttributes;
 var LinkTarget = displayDOMUtils.LinkTarget;
@@ -451,7 +450,7 @@ var TextWidgetAnnotationElement = (
         element.type = 'text';
         element.value = this.data.fieldValue;
 
-        if (isInt(this.data.maxLen)) {
+        if (this.data.maxLen !== null) {
           element.maxLength = this.data.maxLen;
         }
       } else {
@@ -467,7 +466,7 @@ var TextWidgetAnnotationElement = (
         this._setTextStyle(element, font);
       }
 
-      if (isInt(this.data.textAlignment)) {
+      if (this.data.textAlignment !== null) {
         element.style.textAlign = TEXT_ALIGNMENT[this.data.textAlignment];
       }
 

test/unit/annotation_layer_spec.js

@@ -453,6 +453,62 @@ describe('Annotation layer', function() {
     });
   });
 
+  describe('TextWidgetAnnotation', function() {
+    var textWidgetDict;
+
+    beforeEach(function (done) {
+      textWidgetDict = new Dict();
+      textWidgetDict.set('Type', Name.get('Annot'));
+      textWidgetDict.set('Subtype', Name.get('Widget'));
+      textWidgetDict.set('FT', Name.get('Tx'));
+
+      done();
+    });
+
+    afterEach(function () {
+      textWidgetDict = null;
+    });
+
+    it('should handle unknown text alignment and maximum length', function() {
+      var textWidgetRef = new Ref(124, 0);
+      var xref = new XRefMock([
+        { ref: textWidgetRef, data: textWidgetDict, }
+      ]);
+
+      var textWidgetAnnotation = annotationFactory.create(xref, textWidgetRef);
+      expect(textWidgetAnnotation.data.textAlignment).toEqual(null);
+      expect(textWidgetAnnotation.data.maxLen).toEqual(null);
+    });
+
+    it('should not set invalid text alignment and maximum length', function() {
+      textWidgetDict.set('Q', 'center');
+      textWidgetDict.set('MaxLen', 'five');
+
+      var textWidgetRef = new Ref(43, 0);
+      var xref = new XRefMock([
+        { ref: textWidgetRef, data: textWidgetDict, }
+      ]);
+
+      var textWidgetAnnotation = annotationFactory.create(xref, textWidgetRef);
+      expect(textWidgetAnnotation.data.textAlignment).toEqual(null);
+      expect(textWidgetAnnotation.data.maxLen).toEqual(null);
+    });
+
+    it('should set valid text alignment and maximum length', function() {
+      textWidgetDict.set('Q', 1);
+      textWidgetDict.set('MaxLen', 20);
+
+      var textWidgetRef = new Ref(84, 0);
+      var xref = new XRefMock([
+        { ref: textWidgetRef, data: textWidgetDict, }
+      ]);
+
+      var textWidgetAnnotation = annotationFactory.create(xref, textWidgetRef);
+      expect(textWidgetAnnotation.data.textAlignment).toEqual(1);
+      expect(textWidgetAnnotation.data.maxLen).toEqual(20);
+    });
+  });
+
   describe('FileAttachmentAnnotation', function() {
     var loadingTask;
     var annotations;