Add IndieAuth support

app/templates/index.html

@@ -2,6 +2,9 @@
 {% extends "layout.html" %}
 
 {% block head %}
+<link rel="indieauth-metadata" href="{{ url_for("well_known_authorization_server") }}">
+<link rel="authorization_endpoint" href="{{ url_for("indieauth_authorization_endpoint") }}">
+<link rel="token_endpoint" href="{{ url_for("indieauth_token_endpoint") }}">
 <link rel="alternate" href="{{ local_actor.url }}" title="ActivityPub profile"  type="application/activity+json">
 <meta content="profile" property="og:type" />
 <meta content="{{ local_actor.url }}" property="og:url" />

app/templates/indieauth_flow.html

@@ -0,0 +1,42 @@
+{%- import "utils.html" as utils with context -%}
+{% extends "layout.html" %}
+{% block content %}
+<div class="box">
+<div style="display:flex">
+{% if client.logo %}
+<div style="flex:initial;width:100px;">
+<img src="{{client.logo}}" style="max-width:100px;">
+</div>
+{% endif %}
+<div style="flex:1;">
+<div style="margin-top:20px">
+<a class="lcolor" style="font-size:1.2em;font-weight:600;text-decoration:none;" href="{{ client.url }}">{{ client.name }}</a>
+<p>wants you to login as <strong class="lcolor">{{ me }}</strong></p>
+</div>
+</div>
+</div>
+
+<form method="POST" action="{{ url_for('indieauth_flow') }}">
+    <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
+	{% if scopes %}
+	<h3>Scopes</h3>
+	<ul>
+	{% for scope in scopes %}
+	<li><input type="checkbox" name="scopes" value="{{scope}}" id="scope-{{scope}}"><label for="scope-{{scope}}">{{ scope }}</label>
+	</li>
+	{% endfor %}
+	</ul>
+	{% endif %}
+	<input type="hidden" name="redirect_uri" value="{{ redirect_uri }}">
+	<input type="hidden" name="state" value="{{ state }}">
+	<input type="hidden" name="client_id" value="{{ client_id }}">
+	<input type="hidden" name="me" value="{{ me }}">
+	<input type="hidden" name="response_type" value="{{ response_type }}">
+	<input type="hidden" name="code_challenge" value="{{ code_challenge }}">
+	<input type="hidden" name="code_challenge_method" value="{{ code_challenge_method }}">
+	<input type="submit" value="login">
+</form>
+
+</div>
+</div>
+{% endblock %}

app/templates/login.html

@@ -5,6 +5,7 @@
 <div style="margin:auto;">
 <form class="form" action="/admin/login" method="POST">
 <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
+<input type="hidden" name="redirect" value="{{ redirect }}">
 <input type="password" placeholder="password" name="password" autofocus>
 <input type="submit" value="login">
 </form>