From ee36f2f029a7cf77ed14fe2617058c96d97d8280 Mon Sep 17 00:00:00 2001
From: Aleksander Adamowski <aleksander.adamowski@gmail.com>
Date: Tue, 15 Oct 2013 21:02:47 +0200
Subject: [PATCH] Internal link handling: * Intercept internal link clicks. *
 Attach internal link clicks to proper reader navigation within the spine. *
 Open external links in a new browser window, separate from the reader.

Change-Id: I14bb17a493e678e8a6331b99b7bb90c4aab4aa69
---
 epub-modules/epub-renderer/end.frag   | 65 ++++++++++++++++++++++-----
 epub-modules/epub-renderer/start.frag |  4 +-
 2 files changed, 57 insertions(+), 12 deletions(-)

diff --git a/epub-modules/epub-renderer/end.frag b/epub-modules/epub-renderer/end.frag
index b83165ac8..d843938fa 100644
--- a/epub-modules/epub-renderer/end.frag
+++ b/epub-modules/epub-renderer/end.frag
@@ -9,12 +9,57 @@
             return new SpineItem();
         };
 
-        var loadIframeFunctionGenerator = function(epubFetch) {
-            return  function(iframe, src, callback, context) {
+        var loadIframeFunctionGenerator = function(epubFetch, reader) {
+            return  function(iframe, src, origCallback, context) {
+                var callback = function(success) {
+                    var epubContentDocument = this.$iframe[0].contentDocument;
+                    $('a', epubContentDocument).click(function (clickEvent) {
+                        // Check for both href and xlink:href attribute and get value
+                        var href;
+                        if (clickEvent.currentTarget.attributes["xlink:href"]) {
+                            href = clickEvent.currentTarget.attributes["xlink:href"].value;
+                        }
+                        else {
+                            href = clickEvent.currentTarget.attributes["href"].value;
+                        }
+                        var hrefUri = new URI(href);
+                        var hrefIsRelative = hrefUri.is('relative');
+                        var hrefUriHasFilename = hrefUri.filename();
+                        var overrideClickEvent = false;
+
+                        if (hrefIsRelative) {
+                            // TODO:
+                            if (hrefUriHasFilename /* TODO: && check whether href actually resolves to a spine item */) {
+
+                              var currentSpineItemUri = new URI(context.currentSpineItem.href);
+                              var openedSpineItemUri = hrefUri.absoluteTo(currentSpineItemUri);
+                              var idref = openedSpineItemUri.pathname();
+                              var hashFrag = openedSpineItemUri.fragment();
+                              var spineItem = context.spine.getItemByHref(idref);
+                              var pageData = new ReadiumSDK.Models.PageOpenRequest(spineItem);
+                              if (hashFrag) {
+                                  pageData.setElementId(hashFrag);
+                              }
+                              reader.openPage(pageData);
+                              overrideClickEvent = true;
+                            } // otherwise it's probably just a hash frag that needs to be handled by browser's default handling
+                        } else {
+                            // It's an absolute URL to a remote site - open it in a separate window outside the reader
+                            window.open(href, '_blank');
+                            overrideClickEvent = true;
+                        }
+
+                        if (overrideClickEvent) {
+                            clickEvent.preventDefault();
+                            clickEvent.stopPropagation();
+                        }
+                    });
+                    origCallback.call(this, success);
+                }
                 if (epubFetch.isPackageExploded()) {
                     return origLoadIframeFunction(iframe, src, callback, context);
                 } else {
-                    var onLoadWrapperFunction = function(boolArg) {
+                    var onLoadWrapperFunction = function(success) {
                         var context = this;
                         var itemHref = context.currentSpineItem.href;
                         epubFetch.relativeToPackageFetchFileContents(itemHref, 'text', function(contentDocumentText) {
@@ -25,14 +70,14 @@
                                     var contentDocument = iframe.contentDocument;
                                     contentDocument.replaceChild(resolvedContentDocumentDom.documentElement,
                                         contentDocument.documentElement);
-                                    callback.call(context, boolArg);
+                                    callback.call(context, success);
                                 });
                         }, function(err) {
                             if (err.message) {
                                 console.error(err.message);
                             };
                             console.error(err);
-                            callback.call(context, boolArg);
+                            callback.call(context, success);
                         });
                     };
                     // Feed an artificial empty HTML document to the IFRAME, then let the wrapper onload function
@@ -46,15 +91,15 @@
         };
         var EpubRendererModule = function (epubFetch, elementToBindReaderTo, packageData) {
 
-            /*
-             * Patch the ReadiumSDK.Helpers.LoadIframe global function to support zipped EPUB packages:
-             */
-            ReadiumSDK.Helpers.LoadIframe = loadIframeFunctionGenerator(epubFetch);
-
             var reader = new ReadiumSDK.Views.ReaderView({
               el: elementToBindReaderTo
             });
 
+            /*
+             * Patch the ReadiumSDK.Helpers.LoadIframe global function to support zipped EPUB packages:
+             */
+            ReadiumSDK.Helpers.LoadIframe = loadIframeFunctionGenerator(epubFetch, reader);
+
             // Description: The public interface
             return {
 
diff --git a/epub-modules/epub-renderer/start.frag b/epub-modules/epub-renderer/start.frag
index 753b076f4..b1acf4d23 100644
--- a/epub-modules/epub-renderer/start.frag
+++ b/epub-modules/epub-renderer/start.frag
@@ -1,3 +1,3 @@
-define('epub_renderer_module', ['require', 'module', 'jquery', 'underscore', 'backbone'],
+define('epub_renderer_module', ['require', 'module', 'jquery', 'underscore', 'backbone', 'URIjs/URI'],
 
-    function (require, module, $, _, Backbone) {
+    function (require, module, $, _, Backbone, URI) {