atom feed

Author: aristidb

atom.py

@@ -0,0 +1,25 @@
+from tipfy import RequestHandler, request, Response, url_for
+from tipfy.ext.jinja2 import render_template
+from google.appengine.ext import db
+import models
+from filters import FilterCollection, filters
+
+class AtomViewHandler(RequestHandler):
+    def get(self, **kwargs):
+        response = Response(mimetype = 'application/atom+xml')
+
+        collection = FilterCollection(filters, request, response, cookies=False)
+        
+        q = models.accepted_quotes()
+        collection.add_to_query(q)
+        q.order('-creation_date')
+
+        out = render_template(
+            'cppbash/atom.xml',
+            title = "C++ Bash",
+            link = url_for('home', full=True),
+            quotes = q)
+
+        response.response = [out]
+
+        return response

filters.py

@@ -8,15 +8,18 @@ def __init__(self, name, alternatives, default = '', add_empty = True):
             self._alternatives.append('')
         self._default = default
 
-    def filter(self, request, response):
+    def filter(self, request, response, cookies=True):
         data = request.args.get(self.name, None)
         if data != None:
-            response.set_cookie(self.name, data)
+            if cookies:
+                response.set_cookie(self.name, data)
         else:
-            data = request.cookies.get(self.name, None)
+            if cookies:
+                data = request.cookies.get(self.name, None)
             if data == None:
                 data = self._default
-                response.set_cookie(self.name, data)
+                if cookies:
+                    response.set_cookie(self.name, data)
         return data
 
     def alternatives(self, removed):
@@ -25,13 +28,13 @@ def alternatives(self, removed):
             result.remove(removed)
         return result
 
-    def compute(self, request, response):
-        current = self.filter(request, response)
+    def compute(self, request, response, cookies=True):
+        current = self.filter(request, response, cookies)
         other = self.alternatives(current)
         return (current, other)
 
-    def make_instance(self, request, response):
-        (current, other) = self.compute(request, response)
+    def make_instance(self, request, response, cookies=True):
+        (current, other) = self.compute(request, response, cookies)
         return FilterInstance(self.name, current, other, self._alternatives)
 
 class FilterInstance(object):
@@ -46,10 +49,10 @@ def add_to_query(self, query):
             query.filter(self.name + ' =', self.current)
 
 class FilterCollection(object):
-    def __init__(self, filters, request, response):
+    def __init__(self, filters, request, response, cookies=True):
         self.instances = dict()
         for filt in filters:
-            self.instances[filt.name] = filt.make_instance(request, response)
+            self.instances[filt.name] = filt.make_instance(request, response, cookies)
 
     def __getitem__(self, key):
         return self.instances[key]

middleware/jinja.py

@@ -18,11 +18,15 @@ def linebreaks(eval_ctx, value):
 def urlparameter(value):
     return urllib.quote_plus(value)
 
+def atomdatetime(value):
+    return value.replace(microsecond=0, tzinfo=None).isoformat() + 'Z'
+
 class JinjaMiddleware(object):
     def pre_dispatch_handler(self):
         env = get_env()
         env.autoescape = True
         env.filters['linebreaks'] = linebreaks
         env.filters['urlparameter'] = urlparameter
+        env.filters['atomdatetime'] = atomdatetime
 
 

templates/cppbash/atom.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+
+  <title>{{ title }}</title> 
+  <link href="{{ link }}"/>
+
+  {% for quote in quotes -%}
+  <entry>
+    <title>Quote from {{ quote.creation_date }} ({{ quote.language }} {{ quote.programming_language }})</title>
+    <link href="{{ url_for('quote-view', id = quote.key().id(), full=True) }}"/>
+    <id>{{ url_for('quote-view', id = quote.key().id(), full=True) }}</id>
+    <updated>{{ quote.creation_date|atomdatetime }}</updated>
+    <content type="text">{{ quote.quote }}</content>
+  </entry>
+  {% endfor %}
+</feed>

templates/cppbash/base.html

@@ -4,6 +4,8 @@
         <meta charset="utf-8"> <!-- for validator freaks -->
         <title>{{ head_title }} C++ Bash - Quotes from the C++ world </title>
         <link rel="stylesheet" type="text/css" href="/static/main.css"/>
+        <link href="{{ url_for('atom-view') }}" type="application/atom+xml" rel="alternate" title="Sitewide ATOM Feed" />
+
         <script type="text/javascript" src="/static/jquery-min.js"></script>
         <script type="text/javascript">
           var _gaq = _gaq || [];

urls.py

@@ -22,6 +22,7 @@ def get_rules():
         tipfy.Rule('/review/<int:id>', endpoint='review-quote', handler='review.ReviewQuoteHandler'),
         tipfy.Rule('/quote/<int:id>', endpoint='quote-view', handler='quote.QuoteViewHandler'),
         tipfy.Rule('/random', endpoint='random-quote', handler='random_quote.RandomQuoteHandler'),
+        tipfy.Rule('/atom', endpoint='atom-view', handler='atom.AtomViewHandler')
         ]
 
     for app_module in tipfy.get_config('tipfy', 'apps_installed'):