From 09ca49e62558479f89bbbfee1231284ce13c03f8 Mon Sep 17 00:00:00 2001
From: Timo Kluck <tkluck@infty.nl>
Date: Tue, 26 Sep 2023 20:33:30 +0100
Subject: [PATCH 1/3] Explicit support for protocol and port

This makes it easier to test using a localhost server
---
 htmlpreview.js | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/htmlpreview.js b/htmlpreview.js
index a38e616..492fc76 100644
--- a/htmlpreview.js
+++ b/htmlpreview.js
@@ -4,6 +4,15 @@
 
 	var url = location.search.substring(1).replace(/\/\/github\.com/, '//raw.githubusercontent.com').replace(/\/blob\//, '/'); //Get URL of the raw file
 
+	var rewrite = function (url) {
+		if (location.port.length) {
+			port_part = ':' + location.port
+		} else {
+			port_part = ''
+		}
+		return location.protocol + '//' + location.hostname + port_part + location.pathname + '?' + url
+	}
+
 	var replaceAssets = function () {
 		var frame, a, link, links = [], script, scripts = [], i, href, src;
 		//Framesets
@@ -14,7 +23,7 @@
 		for (i = 0; i < frame.length; ++i) {
 			src = frame[i].src; //Get absolute URL
 			if (src.indexOf('//raw.githubusercontent.com') > 0 || src.indexOf('//bitbucket.org') > 0) { //Check if it's from raw.github.com or bitbucket.org
-				frame[i].src = '//' + location.hostname + location.pathname + '?' + src; //Then rewrite URL so it can be loaded using CORS proxy
+				frame[i].src = rewrite(src); //Then rewrite URL so it can be loaded using CORS proxy
 			}
 		}
 		//Links
@@ -22,9 +31,9 @@
 		for (i = 0; i < a.length; ++i) {
 			href = a[i].href; //Get absolute URL
 			if (href.indexOf('#') > 0) { //Check if it's an anchor
-				a[i].href = '//' + location.hostname + location.pathname + location.search + '#' + a[i].hash.substring(1); //Then rewrite URL with support for empty anchor
+				a[i].href = location.protocol + '//' + location.hostname + ':' + location.port + location.pathname + location.search + '#' + a[i].hash.substring(1); //Then rewrite URL with support for empty anchor
 			} else if ((href.indexOf('//raw.githubusercontent.com') > 0 || href.indexOf('//bitbucket.org') > 0) && (href.indexOf('.html') > 0 || href.indexOf('.htm') > 0)) { //Check if it's from raw.github.com or bitbucket.org and to HTML files
-				a[i].href = '//' + location.hostname + location.pathname + '?' + href; //Then rewrite URL so it can be loaded using CORS proxy
+				a[i].href = rewrite(href); //Then rewrite URL so it can be loaded using CORS proxy
 			}
 		}
 		//Stylesheets

From 78e3fb082392a4876ae2ccf95c849a086d27ba6a Mon Sep 17 00:00:00 2001
From: Timo Kluck <tkluck@infty.nl>
Date: Tue, 26 Sep 2023 20:35:33 +0100
Subject: [PATCH 2/3] Add support for object tags (e.g. embedded svg)

---
 htmlpreview.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/htmlpreview.js b/htmlpreview.js
index 492fc76..fb01402 100644
--- a/htmlpreview.js
+++ b/htmlpreview.js
@@ -26,6 +26,14 @@
 				frame[i].src = rewrite(src); //Then rewrite URL so it can be loaded using CORS proxy
 			}
 		}
+		//Objects
+		object = document.querySelectorAll('object[data]');
+		for (i = 0; i < object.length; ++i) {
+			src = object[i].data; //Get absolute URL
+			if (src.indexOf('//raw.githubusercontent.com') > 0 || src.indexOf('//bitbucket.org') > 0) { //Check if it's from raw.github.com or bitbucket.org
+				object[i].data = rewrite(src); //Then rewrite URL so it can be loaded using CORS proxy
+			}
+		}
 		//Links
 		a = document.querySelectorAll('a[href]');
 		for (i = 0; i < a.length; ++i) {

From 47759e20856a6b8cb1f60b670f7eb3597f0e92d6 Mon Sep 17 00:00:00 2001
From: Timo Kluck <tkluck@infty.nl>
Date: Tue, 26 Sep 2023 20:41:46 +0100
Subject: [PATCH 3/3] Remove special casing for anchors

This breaks support for anchors _into other pages_ because it seems to
assume every anchor is within the same page.
---
 htmlpreview.js | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/htmlpreview.js b/htmlpreview.js
index fb01402..77fa823 100644
--- a/htmlpreview.js
+++ b/htmlpreview.js
@@ -38,9 +38,7 @@
 		a = document.querySelectorAll('a[href]');
 		for (i = 0; i < a.length; ++i) {
 			href = a[i].href; //Get absolute URL
-			if (href.indexOf('#') > 0) { //Check if it's an anchor
-				a[i].href = location.protocol + '//' + location.hostname + ':' + location.port + location.pathname + location.search + '#' + a[i].hash.substring(1); //Then rewrite URL with support for empty anchor
-			} else if ((href.indexOf('//raw.githubusercontent.com') > 0 || href.indexOf('//bitbucket.org') > 0) && (href.indexOf('.html') > 0 || href.indexOf('.htm') > 0)) { //Check if it's from raw.github.com or bitbucket.org and to HTML files
+			if ((href.indexOf('//raw.githubusercontent.com') > 0 || href.indexOf('//bitbucket.org') > 0) && (href.indexOf('.html') > 0 || href.indexOf('.htm') > 0)) { //Check if it's from raw.github.com or bitbucket.org and to HTML files
 				a[i].href = rewrite(href); //Then rewrite URL so it can be loaded using CORS proxy
 			}
 		}