feature/metafeeds: Support for canteen meta feeds and index feed (#2)

* feature/metafeeds: Restructured API, splitted menu and meta feed

* feature/metafeeds: add field 'key' to Canteen

* feature/metafeeds: added helper function for reverse urls

* feature/metafeeds: added menu feed url to meta feed

* feature/metafeeds: added missing test

(added: testing meta feed rendering in retrievaltest)

* feature/metafeeds: added feed index page

* whitespace fix

* feature/metafeeds: added alias urls

* feature/metafeeds: moved meta feed default url

* feature/metafeeds: moved index generation to views

* feature/metafeeds: inlined builder instance creation

* feature/metafeeds: removed unused 'menu' parameter

* feature/metafeeds: replaced 'reverse' module with Flask's url_for

* feature/metafeeds: removed unused import

* feature/metafeeds: removed unused function parameters

* feature/metafeeds: moved menu feed url generation to views.py

* feature/metafeeds: cleanup debug prints

removing debug prints that should never have been committed.

stw_potsdam/canteen.py

@@ -2,4 +2,4 @@
 
 from collections import namedtuple
 
-Canteen = namedtuple('Canteen', ('name', 'street', 'city', 'id', 'chash'))
+Canteen = namedtuple('Canteen', ('key', 'name', 'street', 'city', 'id', 'chash'))

stw_potsdam/config.py

@@ -17,7 +17,8 @@ def _get_config(filename):
 
 def _parse_canteen(config, canteen_name):
     get = partial(config.get, canteen_name)
-    return Canteen(name=get('name'),
+    return Canteen(key=canteen_name,
+                   name=get('name'),
                    street=get('street'),
                    city=get('city'),
                    id=get('id'),

stw_potsdam/feed.py

@@ -2,6 +2,7 @@
 
 from pyopenmensa.feed import LazyBuilder
 
+
 PRICE_ROLE_MAPPING = {
     'student': 'preis_s',
     'other': 'preis_g',
@@ -48,18 +49,22 @@ def _process_day(builder, day):
                         roles=None)
 
 
-def _create_builder(canteen):
+def render_menu(menu):
     builder = LazyBuilder()
-    builder.name = canteen.name
-    builder.address = canteen.street
-    builder.city = canteen.city
-    return builder
-
-
-def render(canteen, menu):
-    builder = _create_builder(canteen)
 
     for day in _active_days(menu):
         _process_day(builder, day)
 
     return builder.toXMLFeed()
+
+
+def render_meta(canteen, menu_feed_url):
+    builder = LazyBuilder()
+
+    builder.name = canteen.name
+    builder.address = canteen.street
+    builder.city = canteen.city
+
+    builder.define(name="full", priority="0", url=menu_feed_url, source=None, dayOfWeek="*", dayOfMonth="*", hour="8-18", minute="0", retry="30 1")
+
+    return builder.toXMLFeed()

stw_potsdam/views.py

@@ -1,6 +1,9 @@
 # -*- encoding: utf-8 -*-
 
-from flask import Flask, make_response
+import os
+import urlparse
+
+from flask import Flask, jsonify, make_response, url_for
 from werkzeug.contrib.cache import SimpleCache
 
 import feed
@@ -10,6 +13,16 @@ from canteen_api import MenuParams, download_menu
 CACHE_TIMEOUT = 45 * 60
 
 app = Flask(__name__)
+app.url_map.strict_slashes = False
+
+if 'BASE_URL' in os.environ:
+    base_url = urlparse.urlparse(os.environ.get('BASE_URL'))
+    if base_url.scheme:
+        app.config['PREFERRED_URL_SCHEME'] = base_url.scheme
+    if base_url.netloc:
+        app.config['SERVER_NAME'] = base_url.netloc
+    if base_url.path:
+        app.config['APPLICATION_ROOT'] = base_url.path
 
 cache = SimpleCache()
 
@@ -37,15 +50,37 @@ def get_menu(canteen, params):
     return menu
 
 
-def canteen_feed_xml(canteen, menu):
-    xml = feed.render(canteen, menu)
+def _canteen_feed_xml(xml):
     response = make_response(xml)
     response.mimetype = 'text/xml'
     return response
 
 
-@app.route('/canteen/<canteen_name>')
-def canteen_feed(canteen_name):
+def canteen_menu_feed_xml(menu):
+    xml = feed.render_menu(menu)
+    return _canteen_feed_xml(xml)
+
+
+def canteen_meta_feed_xml(canteen):
+    menu_feed_url = url_for('canteen_menu_feed', canteen_name=canteen.key, _external=True)
+    xml = feed.render_meta(canteen, menu_feed_url)
+    return _canteen_feed_xml(xml)
+
+
+@app.route('/canteens/<canteen_name>')
+@app.route('/canteens/<canteen_name>/meta')
+def canteen_meta_feed(canteen_name):
+    config = read_canteen_config()
+
+    if canteen_name not in config:
+        return canteen_not_found(config, canteen_name)
+
+    canteen = config[canteen_name]
+    return canteen_meta_feed_xml(canteen)
+
+
+@app.route('/canteens/<canteen_name>/menu')
+def canteen_menu_feed(canteen_name):
     config = read_canteen_config()
 
     if canteen_name not in config:
@@ -53,7 +88,15 @@ def canteen_feed(canteen_name):
 
     canteen = config[canteen_name]
     menu = get_menu_cached(canteen)
-    return canteen_feed_xml(canteen, menu)
+    return canteen_menu_feed_xml(menu)
+
+
+@app.route('/')
+@app.route('/canteens')
+def canteen_index():
+    config = read_canteen_config()
+    return jsonify({key: url_for('canteen_meta_feed', canteen_name=key, _external=True) for key in config})
+
 
 @app.route('/health_check')
 def health_check():

tests/resources/menu_output.xml

@@ -1,9 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <openmensa version="2.1" xmlns="http://openmensa.org/open-mensa-v2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://openmensa.org/open-mensa-v2 http://openmensa.org/open-mensa-v2.xsd">
   <canteen>
-    <name>Mensa Griebnitzsee</name>
-    <address>August-Bebel-Straße 69, Haus 6</address>
-    <city>14482 Potsdam</city>
     <day date="2018-09-19">
       <category name="Angebot 1">
         <meal>

tests/resources/meta_output.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<openmensa version="2.1" xmlns="http://openmensa.org/open-mensa-v2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://openmensa.org/open-mensa-v2 http://openmensa.org/open-mensa-v2.xsd">
+  <canteen>
+    <name>Mensa Griebnitzsee</name>
+    <address>August-Bebel-Straße 69, Haus 6</address>
+    <city>14482 Potsdam</city>
+    <feed name="full" priority="0">
+      <schedule dayOfMonth="*" dayOfWeek="*" hour="8-18" minute="0" retry="30 1"/>
+      <url>canteens/griebnitzsee/menu</url>
+    </feed>
+  </canteen>
+</openmensa>

tests/test_consistency.py

@@ -21,16 +21,32 @@ def _menu():
         return json.load(f)
 
 
-def _expected_feed():
-    with io.open(_resource_path('output.xml'), encoding='utf-8') as f:
+def _expected_meta_feed():
+    with io.open(_resource_path('meta_output.xml'), encoding='utf-8') as f:
         return f.read()
 
 
-def test_consistency():
+def _expected_menu_feed():
+    with io.open(_resource_path('menu_output.xml'), encoding='utf-8') as f:
+        return f.read()
+
+
+def test_meta_consistency():
+    canteen = _canteen()
+    menu = _menu()
+    menu_feed_url = "canteens/{}/menu".format(canteen.key)
+
+    actual = feed.render_meta(canteen, menu_feed_url)
+
+    expected = _expected_meta_feed()
+    assert expected == actual
+
+
+def test_menu_consistency():
     canteen = _canteen()
     menu = _menu()
 
-    actual = feed.render(canteen, menu)
+    actual = feed.render_menu(menu)
 
-    expected = _expected_feed()
+    expected = _expected_menu_feed()
     assert expected == actual

tests/test_retrieval.py

@@ -27,4 +27,5 @@ requires_online_api = pytest.mark.skipif(
 @requires_online_api
 def test_retrieval(canteen):
     menu = download_menu(MenuParams(canteen_id=canteen.id, chash=canteen.chash))
-    feed.render(canteen, menu)
+    feed.render_meta(canteen, menu)
+    feed.render_menu(canteen, menu)