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flask_app.py
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flask_app.py
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# encoding: utf-8
import os
import time
import importlib
import inspect
import itertools
from flask import Flask, Blueprint
from flask.ctx import _AppCtxGlobals
from flask.sessions import SessionInterface
from werkzeug.exceptions import HTTPException
from werkzeug.routing import Rule
from flask_debugtoolbar import DebugToolbarExtension
from beaker.middleware import SessionMiddleware
from paste.deploy.converters import asbool
from fanstatic import Fanstatic
from ckan.lib import helpers
from ckan.lib import jinja_extensions
from ckan.common import config, g, request
import ckan.lib.app_globals as app_globals
from ckan.plugins import PluginImplementations
from ckan.plugins.interfaces import IBlueprint
from ckan.views import (identify_user,
set_cors_headers_for_response,
check_session_cookie,
)
import logging
log = logging.getLogger(__name__)
def make_flask_stack(conf, **app_conf):
""" This has to pass the flask app through all the same middleware that
Pylons used """
root = os.path.dirname(
os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
debug = asbool(app_conf.get('debug', app_conf.get('DEBUG', False)))
testing = asbool(app_conf.get('testing', app_conf.get('TESTING', False)))
app = flask_app = CKANFlask(__name__)
app.debug = debug
app.testing = testing
app.template_folder = os.path.join(root, 'templates')
app.app_ctx_globals_class = CKAN_AppCtxGlobals
app.url_rule_class = CKAN_Rule
# Update Flask config with the CKAN values. We use the common config
# object as values might have been modified on `load_environment`
if config:
app.config.update(config)
else:
app.config.update(conf)
app.config.update(app_conf)
# Do all the Flask-specific stuff before adding other middlewares
# Secret key needed for flask-debug-toolbar and sessions
if not app.config.get('SECRET_KEY'):
app.config['SECRET_KEY'] = config.get('beaker.session.secret')
if not app.config.get('SECRET_KEY'):
raise RuntimeError(u'You must provide a value for the secret key'
' with the SECRET_KEY config option')
if debug:
app.config['DEBUG_TB_INTERCEPT_REDIRECTS'] = False
DebugToolbarExtension(app)
# Use Beaker as the Flask session interface
class BeakerSessionInterface(SessionInterface):
def open_session(self, app, request):
if 'beaker.session' in request.environ:
return request.environ['beaker.session']
def save_session(self, app, session, response):
session.save()
cache_dir = app_conf.get('cache_dir') or app_conf.get('cache.dir')
session_opts = {
'session.data_dir': '{data_dir}/sessions'.format(
data_dir=cache_dir),
'session.key': app_conf.get('beaker.session.key'),
'session.cookie_expires':
app_conf.get('beaker.session.cookie_expires'),
'session.secret': app_conf.get('beaker.session.secret')
}
app.wsgi_app = SessionMiddleware(app.wsgi_app, session_opts)
app.session_interface = BeakerSessionInterface()
# Add Jinja2 extensions and filters
extensions = [
'jinja2.ext.do', 'jinja2.ext.with_',
jinja_extensions.SnippetExtension,
jinja_extensions.CkanExtend,
jinja_extensions.CkanInternationalizationExtension,
jinja_extensions.LinkForExtension,
jinja_extensions.ResourceExtension,
jinja_extensions.UrlForStaticExtension,
jinja_extensions.UrlForExtension
]
for extension in extensions:
app.jinja_env.add_extension(extension)
app.jinja_env.filters['empty_and_escape'] = \
jinja_extensions.empty_and_escape
app.jinja_env.filters['truncate'] = jinja_extensions.truncate
# Common handlers for all requests
@app.before_request
def ckan_before_request():
# Start the request timer
g._request_timer = time.time()
# Update app_globals
app_globals.app_globals._check_uptodate()
# Identify the user from the repoze cookie or the API header
# Sets g.user and g.userobj
identify_user()
@app.after_request
def ckan_after_request(response):
# Check session cookie
response = check_session_cookie(response)
# Set CORS headers if necessary
response = set_cors_headers_for_response(response)
# Log time between before and after view
request_time = time.time() - g._request_timer
url = request.environ.get('CKAN_CURRENT_URL')
if url:
url = url.split('?')[0]
log.info('{url} render time {request_time:.3f} seconds'.format(
url=url, request_time=request_time))
return response
# Template context processors
@app.context_processor
def helper_functions():
u'''Make helper functions (`h`) available to Flask templates'''
helpers.load_plugin_helpers()
return dict(h=helpers.helper_functions)
@app.context_processor
def c_object():
u'''
Expose `c` as an alias of `g` in templates for backwards compatibility
'''
return dict(c=g)
@app.route('/hello', methods=['GET'])
def hello_world():
return 'Hello World, this is served by Flask'
@app.route('/hello', methods=['POST'])
def hello_world_post():
return 'Hello World, this was posted to Flask'
# Auto-register all blueprints defined in the `views` folder
_register_core_blueprints(app)
# Set up each IBlueprint extension as a Flask Blueprint
for plugin in PluginImplementations(IBlueprint):
if hasattr(plugin, 'get_blueprint'):
app.register_extension_blueprint(plugin.get_blueprint())
# Start other middleware
# Fanstatic
if debug:
fanstatic_config = {
'versioning': True,
'recompute_hashes': True,
'minified': False,
'bottom': True,
'bundle': False,
}
else:
fanstatic_config = {
'versioning': True,
'recompute_hashes': False,
'minified': True,
'bottom': True,
'bundle': True,
}
app = Fanstatic(app, **fanstatic_config)
# Update the main CKAN config object with the Flask specific keys
# that were set here or autogenerated
flask_config_keys = set(flask_app.config.keys()) - set(config.keys())
for key in flask_config_keys:
config[key] = flask_app.config[key]
# Add a reference to the actual Flask app so it's easier to access
app._wsgi_app = flask_app
return app
class CKAN_Rule(Rule):
u'''Custom Flask url_rule_class.
We use it to be able to flag routes defined in extensions as such
'''
def __init__(self, *args, **kwargs):
self.ckan_core = True
super(CKAN_Rule, self).__init__(*args, **kwargs)
class CKAN_AppCtxGlobals(_AppCtxGlobals):
'''Custom Flask AppCtxGlobal class (flask.g).'''
def __getattr__(self, name):
'''
If flask.g doesn't have attribute `name`, fall back to CKAN's
app_globals object.
If the key is also not found in there, an AttributeError will be raised
'''
return getattr(app_globals.app_globals, name)
class CKANFlask(Flask):
'''Extend the Flask class with a special method called on incoming
requests by AskAppDispatcherMiddleware.
'''
app_name = 'flask_app'
def can_handle_request(self, environ):
'''
Decides whether it can handle a request with the Flask app by
matching the request environ against the route mapper
Returns (True, 'flask_app', origin) if this is the case.
`origin` can be either 'core' or 'extension' depending on where
the route was defined.
'''
urls = self.url_map.bind_to_environ(environ)
try:
rule, args = urls.match(return_rule=True)
origin = 'core'
if hasattr(rule, 'ckan_core') and not rule.ckan_core:
origin = 'extension'
log.debug('Flask route match, endpoint: {0}, args: {1}, '
'origin: {2}'.format(rule.endpoint, args, origin))
return (True, self.app_name, origin)
except HTTPException:
return (False, self.app_name)
def register_extension_blueprint(self, blueprint, **kwargs):
'''
This method should be used to register blueprints that come from
extensions, so there's an opportunity to add extension-specific
options.
Sets the rule property `ckan_core` to False, to indicate that the rule
applies to an extension route.
'''
self.register_blueprint(blueprint, **kwargs)
# Get the new blueprint rules
bp_rules = [v for k, v in self.url_map._rules_by_endpoint.items()
if k.startswith(blueprint.name)]
bp_rules = list(itertools.chain.from_iterable(bp_rules))
# This compare key will ensure the rule will be near the top.
top_compare_key = False, -100, [(-2, 0)]
for r in bp_rules:
r.ckan_core = False
r.match_compare_key = lambda: top_compare_key
def _register_core_blueprints(app):
u'''Register all blueprints defined in the `views` folder
'''
views_path = os.path.join(os.path.dirname(__file__),
u'..', u'..', u'views')
module_names = [f.rstrip(u'.py')
for f in os.listdir(views_path)
if f.endswith(u'.py') and not f.startswith(u'_')]
blueprints = []
for name in module_names:
module = importlib.import_module(u'ckan.views.{0}'.format(name))
blueprints.extend([m for m in inspect.getmembers(module)
if isinstance(m[1], Blueprint)])
if blueprints:
for blueprint in blueprints:
app.register_blueprint(blueprint[1])
log.debug(u'Registered core blueprint: {0}'.format(blueprint[0]))