Add maintenance page

Author: said-moj

app/config/__init__.py

@@ -18,5 +18,5 @@ class Config(object):
     SERVICE_PHASE = os.environ.get("SERVICE_PHASE", "Beta")
     SERVICE_URL = os.environ.get("SERVICE_URL", "")
     SESSION_COOKIE_HTTPONLY = True
-    # SESSION_COOKIE_SECURE = True
     SENTRY_DSN = os.environ.get("SENTRY_DSN")
+    MAINTENANCE_MODE = os.environ.get("MAINTENANCE_MODE", "False").lower() == "true"

app/main/routes.py

@@ -1,4 +1,13 @@
-from flask import flash, json, make_response, redirect, render_template, request
+from flask import (
+    flash,
+    json,
+    make_response,
+    redirect,
+    render_template,
+    request,
+    url_for,
+)
+from flask import current_app
 from flask_wtf.csrf import CSRFError
 from werkzeug.exceptions import HTTPException
 
@@ -11,6 +20,13 @@ def index():
     return render_template("index.html")
 
 
+@bp.route("/maintenance-mode", methods=["GET"])
+def maintenance_mode_page():
+    if not current_app.config["MAINTENANCE_MODE"]:
+        return redirect(url_for("main.index"))
+    return render_template("maintenance-mode.html"), 503
+
+
 @bp.route("/accessibility", methods=["GET"])
 def accessibility():
     return render_template("accessibility.html")
@@ -65,3 +81,10 @@ def http_exception(error):
 def csrf_error(error):
     flash("The form you were submitting has expired. Please try again.")
     return redirect(request.full_path)
+
+
+@bp.before_request
+def maintenance_mode_middleware():
+    maintenance_url = url_for("main.maintenance_mode_page")
+    if current_app.config["MAINTENANCE_MODE"] and request.path != maintenance_url:
+        return redirect(maintenance_url)

app/templates/main/maintenance-mode.html

@@ -0,0 +1,14 @@
+{% extends "base.html" %}
+
+{% block pageTitle %}This service is currently down for maintenance{% endblock %}
+
+{% set mainClasses = "govuk-main-wrapper--l" %}
+
+{% block content %}
+<div class="govuk-grid-row">
+    <div class="govuk-grid-column-two-thirds">
+        <h1 class="govuk-heading-l">This service is currently down for maintenance</h1>
+        <p class="govuk-body">'If you were part way through the service, you will have to start again when the service becomes available.</p>
+    </div>
+</div>
+{% endblock %}

helm_deploy/laa-access-civil-legal-aid/values.yaml

@@ -73,4 +73,9 @@ envVars:
   SENTRY_DSN:
     secret:
       name: sentry
-      key: dsn
+      key: dsn
+  MAINTENANCE_MODE:
+    configmap:
+      name: maintenance-mode
+      key: enabled
+      optional: true