Add URLs to download the agreement without login

So that we can share these URLs in an email we’re sending out.

app/main/views/agreement.py

@@ -1,4 +1,4 @@
-from flask import render_template, send_file
+from flask import abort, render_template, request, send_file, url_for
 from flask_login import login_required
 
 from app.main import main
@@ -28,3 +28,24 @@ def download_agreement():
     return send_file(**get_mou(
         AgreementInfo.from_current_user().crown_status_or_404
     ))
+
+
+@main.route('/agreement/<variant>', endpoint='public_agreement')
+@main.route('/agreement/<variant>.pdf', endpoint='public_download_agreement')
+def public_agreement(variant):
+
+    if variant not in {'crown', 'non-crown'}:
+        abort(404)
+
+    if request.endpoint == 'main.public_download_agreement':
+        return send_file(**get_mou(
+            organisation_is_crown=(variant == 'crown')
+        ))
+
+    agreement_info = AgreementInfo.from_current_user()
+
+    return render_template(
+        'views/agreement-public.html',
+        owner=agreement_info.owner,
+        download_link=url_for('.public_download_agreement', variant=variant),
+    )

app/navigation.py

@@ -169,6 +169,8 @@ class HeaderNavigation(Navigation):
         'old_using_notify',
         'organisation_dashboard',
         'organisation_settings',
+        'public_agreement',
+        'public_download_agreement',
         'received_text_messages_callback',
         'redact_template',
         'register',
@@ -414,6 +416,8 @@ class MainNavigation(Navigation):
         'organisations',
         'platform_admin',
         'pricing',
+        'public_agreement',
+        'public_download_agreement',
         'redact_template',
         'register',
         'register_from_invite',
@@ -578,6 +582,8 @@ class OrgNavigation(Navigation):
         'organisations',
         'platform_admin',
         'pricing',
+        'public_agreement',
+        'public_download_agreement',
         'received_text_messages_callback',
         'redact_template',
         'register',

app/templates/views/agreement-public.html

@@ -0,0 +1,27 @@
+{% extends "withoutnav_template.html" %}
+{% from "components/sub-navigation.html" import sub_navigation %}
+
+{% block per_page_title %}
+  Download the GOV.UK Notify data sharing and financial agreement
+{% endblock %}
+
+{% block maincolumn_content %}
+
+<div class="grid-row">
+  <div class="column-two-thirds">
+
+    <h1 class="heading-large">
+      Download the GOV.UK Notify data sharing and financial agreement
+    </h1>
+
+    <p>
+      <a href="{{ download_link }}">Download the agreement</a>{% if owner %} for {{ owner }}{% endif %}.
+    </p>
+    <p>
+      The agreement contains commercially sensitive information, so don’t share it more widely than you need to.
+    </p>
+
+  </div>
+</div>
+
+{% endblock %}