From d4707196ec6b89d37c76b9ac6970c89237cbc7aa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20Sch=C3=A4fer?= <j.wielicki@sotecware.net>
Date: Tue, 9 Feb 2021 16:43:36 +0100
Subject: [PATCH] Include Link header and element in invite response

This allows future App versions to also work with the invite page
without having to screen scrape the content.

Fixes #56 (at least for the portal side of things).
---
 snikket_web/invite.py                  | 10 ++++++++--
 snikket_web/templates/invite_view.html |  1 +
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/snikket_web/invite.py b/snikket_web/invite.py
index 97bf0fb..315b0f5 100644
--- a/snikket_web/invite.py
+++ b/snikket_web/invite.py
@@ -53,7 +53,7 @@ async def view_old(id_: str) -> quart.Response:
 
 
 @bp.route("/<id_>/")
-async def view(id_: str) -> str:
+async def view(id_: str) -> typing.Union[quart.Response, str]:
     try:
         invite = await client.get_public_invite_by_id(id_)
     except aiohttp.ClientResponseError as exc:
@@ -84,13 +84,19 @@ async def view(id_: str) -> str:
     )
     apple_store_url = current_app.config["APPLE_STORE_URL"]
 
-    return await render_template(
+    body = await render_template(
         "invite_view.html",
         invite=invite,
         play_store_url=play_store_url,
         apple_store_url=apple_store_url,
         invite_id=id_,
     )
+    return quart.Response(
+        body,
+        headers={
+            "Link": "<{}> rel=\"alternate\"".format(invite.xmpp_uri),
+        }
+    )
 
 
 class RegisterForm(flask_wtf.FlaskForm):  # type:ignore
diff --git a/snikket_web/templates/invite_view.html b/snikket_web/templates/invite_view.html
index 01aee73..9c7798a 100644
--- a/snikket_web/templates/invite_view.html
+++ b/snikket_web/templates/invite_view.html
@@ -6,6 +6,7 @@
 <title>{% trans site_name=config["SITE_NAME"] %}Invite to {{ site_name }} | Snikket{% endtrans %}</title>
 <script async type="text/javascript" src="{{ url_for("static", filename="js/invite-magic.js") }}"></script>
 <script async type="text/javascript" src="{{ url_for("static", filename="js/qrcode.min.js") }}"></script>
+<link rel="alternate" href="{{ invite.xmpp_uri }}">
 {% endblock %}
 {% block content %}
 <div class="elevated box el-3">