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index.py
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index.py
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#!/usr/bin/env python
# Copyright (C) 2012, Valentin Lorentz
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import os
import sys
import json
import datetime
import urlparse
import psycopg2
sys.path.append(os.path.dirname(__file__))
import uddlib
from config import HOST, PORT, USER, PASSWORD, DATABASE
connection = psycopg2.connect(host=HOST, port=PORT, user=USER,
database=DATABASE, password=PASSWORD)
uddlib.connection = connection
def dthandler(obj):
if isinstance(obj, datetime.datetime):
return obj.isoformat()
elif isinstance(obj, uddlib.UddResource):
return dict(zip(obj.pk, obj._parameter))
# Not obj.data, because computed_fields would result in circular
# computation.
else:
return None
# Perform standart serialization
def serialize(data):
return json.dumps(data, sort_keys=True, indent=4, default=dthandler)
def get_subclasses(cls):
subclasses = []
subclasses = cls.__subclasses__()
for subclass in cls.__subclasses__():
subclasses.extend(get_subclasses(subclass))
return subclasses
def application(environ, start_response):
url = [x for x in environ['PATH_INFO'].split('/') if x != '']
if len(url) == 0: # Return list of resources
resources = dict([
(x.__name__, {'path': x._path, 'doc': (x.__doc__ or '').strip(),})
for x in get_subclasses(uddlib.UddResource)])
data = {'info': 'This is a JSON API for the Ultimate Debian Database.',
'doc': 'https://github.com/ProgVal/udd-http-api/blob/master/README',
'resources': resources}
start_response('200 OK', [('Content-type', 'application/json')])
return [serialize(data)]
if url[0] == 'robots.txt':
start_response('200 OK', [('Content-type', 'text/plain')])
return ['User-agent: *\nDisallow: /']
try:
cls = uddlib.UddResource.resolve_path(url[0])
except uddlib.ResourceNotFound:
start_response('404 Not Found', [('Content-type', 'text/plain')])
return ['Resource not found.']
if len(url) == 1: # Return a list of objects
filters = urlparse.parse_qs(environ['QUERY_STRING'])
assert all([(x in cls._fields) for x in filters])
# We want {'key': 'value'} and not {'key': ['value']}
filters = dict([(x,y[0]) for x,y in filters.items()])
obj = cls.fetch_database(**filters)
start_response('200 OK', [('Content-type', 'application/json')])
if isinstance(obj, list):
return [serialize([x.data for x in obj])]
else:
return [serialize(obj.data)]
elif len(url) == 2 and url[1] == 'doc':
start_response('200 OK', [('Content-type', 'application/json')])
doc = {'computed fields': dict([(x, getattr(cls, x).__doc__)
for x in (cls._computed_fields)]),
'fields from database': cls._fields}
return [serialize(doc)]