From b6bf8041d8e8ee845728687b1f358f1d482afff2 Mon Sep 17 00:00:00 2001
From: silverwind <me@silverwind.io>
Date: Thu, 8 Feb 2024 03:37:09 +0100
Subject: [PATCH] Fix gitea-origin-url with default ports (#29085)

When setting `url.host` on a URL object with no port specified (like is
the case of default port), the resulting URL's port will not change.
Workaround this quirk in the URL standard by explicitely setting port
for the http and https protocols.

Extracted the logic to a function for the purpose of testing. Initially
I wanted to have the function in utils.js, but it turns out esbuild can
not treeshake the unused functions which would result in the
webcomponents chunk having all 2kB utils.js inlined, so it seemed not
worth.

Fixes: https://github.com/go-gitea/gitea/issues/29084
---
 .eslintrc.yaml                                |  2 +-
 web_src/js/webcomponents/GiteaOriginUrl.js    | 28 +++++++++++--------
 .../js/webcomponents/GiteaOriginUrl.test.js   | 17 +++++++++++
 3 files changed, 34 insertions(+), 13 deletions(-)
 create mode 100644 web_src/js/webcomponents/GiteaOriginUrl.test.js

diff --git a/.eslintrc.yaml b/.eslintrc.yaml
index 78042a7598..fc6f38ec53 100644
--- a/.eslintrc.yaml
+++ b/.eslintrc.yaml
@@ -811,7 +811,7 @@ rules:
   wc/no-constructor-params: [2]
   wc/no-constructor: [2]
   wc/no-customized-built-in-elements: [2]
-  wc/no-exports-with-element: [2]
+  wc/no-exports-with-element: [0]
   wc/no-invalid-element-name: [2]
   wc/no-invalid-extends: [2]
   wc/no-method-prefixed-with-on: [2]
diff --git a/web_src/js/webcomponents/GiteaOriginUrl.js b/web_src/js/webcomponents/GiteaOriginUrl.js
index fca736064c..5d71d95c60 100644
--- a/web_src/js/webcomponents/GiteaOriginUrl.js
+++ b/web_src/js/webcomponents/GiteaOriginUrl.js
@@ -1,17 +1,21 @@
 // Convert an absolute or relative URL to an absolute URL with the current origin
+export function toOriginUrl(urlStr) {
+  try {
+    // only process absolute HTTP/HTTPS URL or relative URLs ('/xxx' or '//host/xxx')
+    if (urlStr.startsWith('http://') || urlStr.startsWith('https://') || urlStr.startsWith('/')) {
+      const {origin, protocol, hostname, port} = window.location;
+      const url = new URL(urlStr, origin);
+      url.protocol = protocol;
+      url.hostname = hostname;
+      url.port = port || (protocol === 'https:' ? '443' : '80');
+      return url.toString();
+    }
+  } catch {}
+  return urlStr;
+}
+
 window.customElements.define('gitea-origin-url', class extends HTMLElement {
   connectedCallback() {
-    const urlStr = this.getAttribute('data-url');
-    try {
-      // only process absolute HTTP/HTTPS URL or relative URLs ('/xxx' or '//host/xxx')
-      if (urlStr.startsWith('http://') || urlStr.startsWith('https://') || urlStr.startsWith('/')) {
-        const url = new URL(urlStr, window.origin);
-        url.protocol = window.location.protocol;
-        url.host = window.location.host;
-        this.textContent = url.toString();
-        return;
-      }
-    } catch {}
-    this.textContent = urlStr;
+    this.textContent = toOriginUrl(this.getAttribute('data-url'));
   }
 });
diff --git a/web_src/js/webcomponents/GiteaOriginUrl.test.js b/web_src/js/webcomponents/GiteaOriginUrl.test.js
new file mode 100644
index 0000000000..f0629842b8
--- /dev/null
+++ b/web_src/js/webcomponents/GiteaOriginUrl.test.js
@@ -0,0 +1,17 @@
+import {toOriginUrl} from './GiteaOriginUrl.js';
+
+test('toOriginUrl', () => {
+  const oldLocation = window.location;
+  for (const origin of ['https://example.com', 'https://example.com:3000']) {
+    window.location = new URL(`${origin}/`);
+    expect(toOriginUrl('/')).toEqual(`${origin}/`);
+    expect(toOriginUrl('/org/repo.git')).toEqual(`${origin}/org/repo.git`);
+    expect(toOriginUrl('https://another.com')).toEqual(`${origin}/`);
+    expect(toOriginUrl('https://another.com/')).toEqual(`${origin}/`);
+    expect(toOriginUrl('https://another.com/org/repo.git')).toEqual(`${origin}/org/repo.git`);
+    expect(toOriginUrl('https://another.com:4000')).toEqual(`${origin}/`);
+    expect(toOriginUrl('https://another.com:4000/')).toEqual(`${origin}/`);
+    expect(toOriginUrl('https://another.com:4000/org/repo.git')).toEqual(`${origin}/org/repo.git`);
+  }
+  window.location = oldLocation;
+});