Refactor `LinkAnnotation` slightly to add `data.url`/`data.dest` at the end

This patch also makes sure that all URLs are converted to the correct encoding.

src/core/annotation.js

@@ -37,6 +37,7 @@ var AnnotationFlag = sharedUtil.AnnotationFlag;
 var AnnotationType = sharedUtil.AnnotationType;
 var OPS = sharedUtil.OPS;
 var Util = sharedUtil.Util;
+var isString = sharedUtil.isString;
 var isArray = sharedUtil.isArray;
 var isInt = sharedUtil.isInt;
 var isValidUrl = sharedUtil.isValidUrl;
@@ -705,11 +706,12 @@ var LinkAnnotation = (function LinkAnnotationClosure() {
     var data = this.data;
     data.annotationType = AnnotationType.LINK;
 
-    var action = dict.get('A');
+    var action = dict.get('A'), url, dest;
     if (action && isDict(action)) {
       var linkType = action.get('S').name;
-      if (linkType === 'URI') {
+      switch (linkType) {
-        var url = action.get('URI');
+        case 'URI':
+          url = action.get('URI');
           if (isName(url)) {
             // Some bad PDFs do not put parentheses around relative URLs.
             url = '/' + url.name;
@@ -718,21 +720,13 @@ var LinkAnnotation = (function LinkAnnotationClosure() {
           }
           // TODO: pdf spec mentions urls can be relative to a Base
           // entry in the dictionary.
-        if (!isValidUrl(url, false)) {
+          break;
-          url = '';
+
-        }
+        case 'GoTo':
-        // According to ISO 32000-1:2008, section 12.6.4.7,
+          dest = action.get('D');
-        // URI should to be encoded in 7-bit ASCII.
+          break;
-        // Some bad PDFs may have URIs in UTF-8 encoding, see Bugzilla 1122280.
+
-        try {
+        case 'GoToR':
-          data.url = stringToUTF8String(url);
-        } catch (e) {
-          // Fall back to a simple copy.
-          data.url = url;
-        }
-      } else if (linkType === 'GoTo') {
-        data.dest = action.get('D');
-      } else if (linkType === 'GoToR') {
           var urlDict = action.get('F');
           if (isDict(urlDict)) {
             // We assume that the 'url' is a Filspec dictionary
@@ -742,31 +736,48 @@ var LinkAnnotation = (function LinkAnnotationClosure() {
 
           // TODO: pdf reference says that GoToR
           // can also have 'NewWindow' attribute
-        if (!isValidUrl(url, false)) {
+          dest = action.get('D');
-          url = '';
+          break;
-        }
+
-        data.url = url;
+        case 'Named':
-        data.dest = action.get('D');
-      } else if (linkType === 'Named') {
           data.action = action.get('N').name;
-      } else {
+          break;
+
+        default:
           warn('unrecognized link type: ' + linkType);
       }
-    } else if (dict.has('Dest')) {
+    } else if (dict.has('Dest')) { // Simple destination link.
-      // simple destination link
+      dest = dict.get('Dest');
-      var dest = dict.get('Dest');
+    }
+
+    if (url) {
+      if (isValidUrl(url, /* allowRelative = */ false)) {
+        data.url = tryConvertUrlEncoding(url);
+      }
+    }
+    if (dest) {
       data.dest = isName(dest) ? dest.name : dest;
     }
   }
 
   // Lets URLs beginning with 'www.' default to using the 'http://' protocol.
   function addDefaultProtocolToUrl(url) {
-    if (url && url.indexOf('www.') === 0) {
+    if (isString(url) && url.indexOf('www.') === 0) {
       return ('http://' + url);
     }
     return url;
   }
 
+  function tryConvertUrlEncoding(url) {
+    // According to ISO 32000-1:2008, section 12.6.4.7, URIs should be encoded
+    // in 7-bit ASCII. Some bad PDFs use UTF-8 encoding, see Bugzilla 1122280.
+    try {
+      return stringToUTF8String(url);
+    } catch (e) {
+      return url;
+    }
+  }
+
   Util.inherit(LinkAnnotation, Annotation, {});
 
   return LinkAnnotation;

src/display/annotation_layer.js

@@ -284,7 +284,7 @@ var LinkAnnotationElement = (function LinkAnnotationElementClosure() {
         if (this.data.action) {
           this._bindNamedAction(link, this.data.action);
         } else {
-          this._bindLink(link, ('dest' in this.data) ? this.data.dest : null);
+          this._bindLink(link, (this.data.dest || null));
         }
       }
 

src/shared/util.js

@@ -312,7 +312,7 @@ function isSameOrigin(baseUrl, otherUrl) {
 
 // Validates if URL is safe and allowed, e.g. to avoid XSS.
 function isValidUrl(url, allowRelative) {
-  if (!url) {
+  if (!url || typeof url !== 'string') {
     return false;
   }
   // RFC 3986 (http://tools.ietf.org/html/rfc3986#section-3.1)