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pillar/pillar/__init__.py
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__init__.py
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"""Pillar server."""
import collections
import contextlib
import copy
import json
import logging
import logging.config
import subprocess
import tempfile
import typing
import os
import os.path
import jinja2
from eve import Eve
import flask
from flask import render_template, request
from flask.templating import TemplateNotFound
import pymongo.collection
import pymongo.database
from werkzeug.local import LocalProxy
from pillar.api import custom_field_validation
from pillar.api.utils import authentication
import pillar.web.jinja
from . import api
from . import web
from . import auth
empty_settings = {
# Use a random URL prefix when booting Eve, to ensure that any
# Flask route that's registered *before* we load our own config
# won't interfere with Pillar itself.
'URL_PREFIX': 'pieQui4vah9euwieFai6naivaV4thahchoochiiwazieBe5o',
'DOMAIN': {},
}
class ConfigurationMissingError(SystemExit):
"""Raised when a vital configuration key is missing.
Causes Python to exit.
"""
class PillarServer(Eve):
def __init__(self, app_root, **kwargs):
kwargs.setdefault('validator', custom_field_validation.ValidateCustomFields)
super(PillarServer, self).__init__(settings=empty_settings, **kwargs)
# mapping from extension name to extension object.
self.pillar_extensions = collections.OrderedDict()
self.pillar_extensions_template_paths = [] # list of paths
self.app_root = os.path.abspath(app_root)
self._load_flask_config()
self._config_logging()
self.log = logging.getLogger('%s.%s' % (__name__, self.__class__.__name__))
self.log.info('Creating new instance from %r', self.app_root)
self._config_tempdirs()
self._config_git()
self._config_bugsnag()
self._config_google_cloud_storage()
self.algolia_index_users = None
self.algolia_index_nodes = None
self.algolia_client = None
self._config_algolia()
self.encoding_service_client = None
self._config_encoding_backend()
try:
self.settings = os.environ['EVE_SETTINGS']
except KeyError:
self.settings = os.path.join(os.path.dirname(os.path.abspath(__file__)),
'api', 'eve_settings.py')
# self.settings = self.config['EVE_SETTINGS_PATH']
self.load_config()
if not self.config.get('SECRET_KEY'):
raise ConfigurationMissingError('SECRET_KEY configuration key is missing')
# Configure authentication
self.login_manager = auth.config_login_manager(self)
self.oauth_blender_id = auth.config_oauth_login(self)
self._config_caching()
self.before_first_request(self.setup_db_indices)
def _load_flask_config(self):
# Load configuration from different sources, to make it easy to override
# settings with secrets, as well as for development & testing.
self.config.from_pyfile(os.path.join(os.path.dirname(__file__), 'config.py'), silent=False)
self.config.from_pyfile(os.path.join(self.app_root, 'config.py'), silent=True)
self.config.from_pyfile(os.path.join(self.app_root, 'config_local.py'), silent=True)
from_envvar = os.environ.get('PILLAR_CONFIG')
if from_envvar:
# Don't use from_envvar, as we want different behaviour. If the envvar
# is not set, it's fine (i.e. silent=True), but if it is set and the
# configfile doesn't exist, it should error out (i.e. silent=False).
self.config.from_pyfile(from_envvar, silent=False)
def _config_logging(self):
# Configure logging
logging.config.dictConfig(self.config['LOGGING'])
log = logging.getLogger(__name__)
if self.config['DEBUG']:
log.info('Pillar starting, debug=%s', self.config['DEBUG'])
def _config_tempdirs(self):
storage_dir = self.config['STORAGE_DIR']
if not os.path.exists(storage_dir):
self.log.info('Creating storage directory %r', storage_dir)
os.makedirs(storage_dir)
# Set the TMP environment variable to manage where uploads are stored.
# These are all used by tempfile.mkstemp(), but we don't knwow in whic
# order. As such, we remove all used variables but the one we set.
tempfile.tempdir = storage_dir
os.environ['TMP'] = storage_dir
os.environ.pop('TEMP', None)
os.environ.pop('TMPDIR', None)
def _config_git(self):
# Get the Git hash
try:
git_cmd = ['git', '-C', self.app_root, 'describe', '--always']
description = subprocess.check_output(git_cmd)
self.config['GIT_REVISION'] = description.strip()
except (subprocess.CalledProcessError, OSError) as ex:
self.log.warning('Unable to run "git describe" to get git revision: %s', ex)
self.config['GIT_REVISION'] = 'unknown'
self.log.info('Git revision %r', self.config['GIT_REVISION'])
def _config_bugsnag(self):
# Configure Bugsnag
if self.config.get('TESTING') or not self.config.get('BUGSNAG_API_KEY'):
self.log.info('Bugsnag NOT configured.')
return
import bugsnag
from bugsnag.flask import handle_exceptions
from bugsnag.handlers import BugsnagHandler
bugsnag.configure(
api_key=self.config['BUGSNAG_API_KEY'],
project_root="/data/git/pillar/pillar",
)
handle_exceptions(self)
bs_handler = BugsnagHandler()
bs_handler.setLevel(logging.ERROR)
self.log.addHandler(bs_handler)
def _config_google_cloud_storage(self):
# Google Cloud project
try:
os.environ['GOOGLE_APPLICATION_CREDENTIALS'] = \
self.config['GCLOUD_APP_CREDENTIALS']
except KeyError:
raise ConfigurationMissingError('GCLOUD_APP_CREDENTIALS configuration is missing')
# Storage backend (GCS)
try:
os.environ['GCLOUD_PROJECT'] = self.config['GCLOUD_PROJECT']
except KeyError:
raise ConfigurationMissingError('GCLOUD_PROJECT configuration value is missing')
def _config_algolia(self):
# Algolia search
if self.config['SEARCH_BACKEND'] != 'algolia':
return
from algoliasearch import algoliasearch
client = algoliasearch.Client(self.config['ALGOLIA_USER'],
self.config['ALGOLIA_API_KEY'])
self.algolia_client = client
self.algolia_index_users = client.init_index(self.config['ALGOLIA_INDEX_USERS'])
self.algolia_index_nodes = client.init_index(self.config['ALGOLIA_INDEX_NODES'])
def _config_encoding_backend(self):
# Encoding backend
if self.config['ENCODING_BACKEND'] != 'zencoder':
self.log.warning('Encoding backend %r not supported, no video encoding possible!',
self.config['ENCODING_BACKEND'])
return
self.log.info('Setting up video encoding backend %r',
self.config['ENCODING_BACKEND'])
from zencoder import Zencoder
self.encoding_service_client = Zencoder(self.config['ZENCODER_API_KEY'])
def _config_caching(self):
from flask_cache import Cache
self.cache = Cache(self)
def load_extension(self, pillar_extension, url_prefix):
from .extension import PillarExtension
if not isinstance(pillar_extension, PillarExtension):
if self.config.get('DEBUG'):
for cls in type(pillar_extension).mro():
self.log.error('class %42r (%i) is %42r (%i): %s',
cls, id(cls), PillarExtension, id(PillarExtension),
cls is PillarExtension)
raise AssertionError('Extension has wrong type %r' % type(pillar_extension))
self.log.info('Loading extension %s', pillar_extension.name)
# Remember this extension, and disallow duplicates.
if pillar_extension.name in self.pillar_extensions:
raise ValueError('Extension with name %s already loaded', pillar_extension.name)
self.pillar_extensions[pillar_extension.name] = pillar_extension
# Load extension Flask configuration
for key, value in pillar_extension.flask_config():
self.config.setdefault(key, value)
# Load extension blueprint(s)
for blueprint in pillar_extension.blueprints():
if blueprint.url_prefix:
if not url_prefix:
# If we registered the extension with url_prefix=None
url_prefix = ''
blueprint_prefix = url_prefix + blueprint.url_prefix
else:
blueprint_prefix = url_prefix
self.register_blueprint(blueprint, url_prefix=blueprint_prefix)
# Load template paths
tpath = pillar_extension.template_path
if tpath:
self.log.info('Extension %s: adding template path %s',
pillar_extension.name, tpath)
if not os.path.exists(tpath):
raise ValueError('Template path %s for extension %s does not exist.',
tpath, pillar_extension.name)
self.pillar_extensions_template_paths.append(tpath)
# Load extension Eve settings
eve_settings = pillar_extension.eve_settings()
if 'DOMAIN' in eve_settings:
pillar_ext_prefix = pillar_extension.name + '_'
pillar_url_prefix = pillar_extension.name + '/'
for key, collection in eve_settings['DOMAIN'].items():
assert key.startswith(pillar_ext_prefix), \
'Eve collection names of %s MUST start with %r' % \
(pillar_extension.name, pillar_ext_prefix)
url = key.replace(pillar_ext_prefix, pillar_url_prefix)
collection.setdefault('datasource', {}).setdefault('source', key)
collection.setdefault('url', url)
self.config['DOMAIN'].update(eve_settings['DOMAIN'])
def _config_jinja_env(self):
# Start with the extensions...
paths_list = [
jinja2.FileSystemLoader(path)
for path in reversed(self.pillar_extensions_template_paths)
]
# ...then load Pillar paths.
pillar_dir = os.path.dirname(os.path.realpath(__file__))
parent_theme_path = os.path.join(pillar_dir, 'web', 'templates')
current_path = os.path.join(self.app_root, 'templates')
paths_list += [
jinja2.FileSystemLoader(current_path),
jinja2.FileSystemLoader(parent_theme_path),
self.jinja_loader
]
# Set up a custom loader, so that Jinja searches for a theme file first
# in the current theme dir, and if it fails it searches in the default
# location.
custom_jinja_loader = jinja2.ChoiceLoader(paths_list)
self.jinja_loader = custom_jinja_loader
pillar.web.jinja.setup_jinja_env(self.jinja_env)
def _config_static_dirs(self):
# Setup static folder for the instanced app
self.static_folder = os.path.join(self.app_root, 'static')
# Setup static folder for Pillar
pillar_dir = os.path.dirname(os.path.realpath(__file__))
pillar_static_folder = os.path.join(pillar_dir, 'web', 'static')
self.register_static_file_endpoint('/static/pillar', 'static_pillar', pillar_static_folder)
# Setup static folders for extensions
for name, ext in self.pillar_extensions.items():
if not ext.static_path:
continue
self.register_static_file_endpoint('/static/%s' % name,
'static_%s' % name,
ext.static_path)
def register_static_file_endpoint(self, url_prefix, endpoint_name, static_folder):
from pillar.web.staticfile import PillarStaticFile
view_func = PillarStaticFile.as_view(endpoint_name, static_folder=static_folder)
self.add_url_rule('%s/<path:filename>' % url_prefix, view_func=view_func)
def process_extensions(self):
# Re-initialise Eve after we allowed Pillar submodules to be loaded.
# EVIL STARTS HERE. It just copies part of the Eve.__init__() method.
self.set_defaults()
self.validate_config()
self.validate_domain_struct()
self._init_url_rules()
self._init_media_endpoint()
self._init_schema_endpoint()
if self.config['OPLOG'] is True:
self._init_oplog()
domain_copy = copy.deepcopy(self.config['DOMAIN'])
for resource, settings in domain_copy.items():
self.register_resource(resource, settings)
self.register_error_handlers()
# EVIL ENDS HERE. No guarantees, though.
self.finish_startup()
def register_error_handlers(self):
super(PillarServer, self).register_error_handlers()
# Register error handlers per code.
for code in (403, 404, 412, 500):
self.register_error_handler(code, self.pillar_error_handler)
# Register error handlers per exception.
from pillarsdk import exceptions as sdk_exceptions
sdk_handlers = [
(sdk_exceptions.UnauthorizedAccess, self.handle_sdk_unauth),
(sdk_exceptions.ForbiddenAccess, self.handle_sdk_forbidden),
(sdk_exceptions.ResourceNotFound, self.handle_sdk_resource_not_found),
(sdk_exceptions.ResourceInvalid, self.handle_sdk_resource_invalid),
(sdk_exceptions.MethodNotAllowed, self.handle_sdk_method_not_allowed),
(sdk_exceptions.PreconditionFailed, self.handle_sdk_precondition_failed),
]
for (eclass, handler) in sdk_handlers:
self.register_error_handler(eclass, handler)
def handle_sdk_unauth(self, error):
"""Global exception handling for pillarsdk UnauthorizedAccess
Currently the api is fully locked down so we need to constantly
check for user authorization.
"""
return flask.redirect(flask.url_for('users.login'))
def handle_sdk_forbidden(self, error):
self.log.info('Forwarding ForbiddenAccess exception to client: %s', error, exc_info=True)
error.code = 403
return self.pillar_error_handler(error)
def handle_sdk_resource_not_found(self, error):
self.log.info('Forwarding ResourceNotFound exception to client: %s', error, exc_info=True)
content = getattr(error, 'content', None)
if content:
try:
error_content = json.loads(content)
except ValueError:
error_content = None
if error_content and error_content.get('_deleted', False):
# This document used to exist, but doesn't any more. Let the user know.
doc_name = error_content.get('name')
node_type = error_content.get('node_type')
if node_type:
node_type = node_type.replace('_', ' ').title()
if doc_name:
description = '%s "%s" was deleted.' % (node_type, doc_name)
else:
description = 'This %s was deleted.' % (node_type,)
else:
if doc_name:
description = '"%s" was deleted.' % doc_name
else:
description = None
error.description = description
error.code = 404
return self.pillar_error_handler(error)
def handle_sdk_precondition_failed(self, error):
self.log.info('Forwarding PreconditionFailed exception to client: %s', error)
error.code = 412
return self.pillar_error_handler(error)
def handle_sdk_resource_invalid(self, error):
self.log.info('Forwarding ResourceInvalid exception to client: %s', error, exc_info=True)
# Raising a Werkzeug 422 exception doens't work, as Flask turns it into a 500.
return 'The submitted data could not be validated.', 422
def handle_sdk_method_not_allowed(self, error):
"""Forwards 405 Method Not Allowed to the client.
This is actually not fair, as a 405 between Pillar and Pillar-Web
doesn't imply that the request the client did on Pillar-Web is not
allowed. However, it does allow us to debug this if it happens, by
watching for 405s in the browser.
"""
from flask import request
self.log.info('Forwarding MethodNotAllowed exception to client: %s', error, exc_info=True)
self.log.info('HTTP Referer is %r', request.referrer)
# Raising a Werkzeug 405 exception doens't work, as Flask turns it into a 500.
return 'The requested HTTP method is not allowed on this URL.', 405
def pillar_error_handler(self, error_ob):
# 'error_ob' can be any exception. If it's not a Werkzeug exception,
# handle it as a 500.
if not hasattr(error_ob, 'code'):
error_ob.code = 500
if not hasattr(error_ob, 'description'):
error_ob.description = str(error_ob)
if request.full_path.startswith('/%s/' % self.config['URL_PREFIX']):
from pillar.api.utils import jsonify
# This is an API request, so respond in JSON.
return jsonify({
'_status': 'ERR',
'_code': error_ob.code,
'_message': error_ob.description,
}, status=error_ob.code)
# See whether we should return an embedded page or a regular one.
if request.is_xhr:
fname = 'errors/%i_embed.html' % error_ob.code
else:
fname = 'errors/%i.html' % error_ob.code
# Also handle the case where we didn't create a template for this error.
try:
return render_template(fname, description=error_ob.description), error_ob.code
except TemplateNotFound:
self.log.warning('Error template %s for code %i not found',
fname, error_ob.code)
return render_template('errors/500.html'), error_ob.code
def finish_startup(self):
self.log.info('Using MongoDB database %r', self.config['MONGO_DBNAME'])
api.setup_app(self)
web.setup_app(self)
authentication.setup_app(self)
for ext in self.pillar_extensions.values():
self.log.info('Setting up extension %s', ext.name)
ext.setup_app(self)
self._config_jinja_env()
self._config_static_dirs()
# Only enable this when debugging.
# self._list_routes()
def setup_db_indices(self):
"""Adds missing database indices.
This does NOT drop and recreate existing indices,
nor does it reconfigure existing indices.
If you want that, drop them manually first.
"""
self.log.debug('Adding any missing database indices.')
import pymongo
db = self.data.driver.db
coll = db['tokens']
coll.create_index([('user', pymongo.ASCENDING)])
coll.create_index([('token', pymongo.ASCENDING)])
coll = db['notifications']
coll.create_index([('user', pymongo.ASCENDING)])
coll = db['activities-subscriptions']
coll.create_index([('context_object', pymongo.ASCENDING)])
coll = db['nodes']
# This index is used for queries on project, and for queries on
# the combination (project, node type).
coll.create_index([('project', pymongo.ASCENDING),
('node_type', pymongo.ASCENDING)])
coll.create_index([('parent', pymongo.ASCENDING)])
coll.create_index([('short_code', pymongo.ASCENDING)],
sparse=True, unique=True)
def register_api_blueprint(self, blueprint, url_prefix):
# TODO: use Eve config variable instead of hard-coded '/api'
self.register_blueprint(blueprint, url_prefix='/api' + url_prefix)
def make_header(self, username, subclient_id=''):
"""Returns a Basic HTTP Authentication header value."""
import base64
return 'basic ' + base64.b64encode('%s:%s' % (username, subclient_id))
def post_internal(self, resource, payl=None, skip_validation=False):
"""Workaround for Eve issue https://github.com/nicolaiarocci/eve/issues/810"""
from eve.methods.post import post_internal
url = self.config['URLS'][resource]
path = '%s/%s' % (self.api_prefix, url)
with self.__fake_request_url_rule('POST', path):
return post_internal(resource, payl=payl, skip_validation=skip_validation)[:4]
def put_internal(self, resource, payload=None, concurrency_check=False,
skip_validation=False, **lookup):
"""Workaround for Eve issue https://github.com/nicolaiarocci/eve/issues/810"""
from eve.methods.put import put_internal
url = self.config['URLS'][resource]
path = '%s/%s/%s' % (self.api_prefix, url, lookup['_id'])
with self.__fake_request_url_rule('PUT', path):
return put_internal(resource, payload=payload, concurrency_check=concurrency_check,
skip_validation=skip_validation, **lookup)[:4]
def patch_internal(self, resource, payload=None, concurrency_check=False,
skip_validation=False, **lookup):
"""Workaround for Eve issue https://github.com/nicolaiarocci/eve/issues/810"""
from eve.methods.patch import patch_internal
url = self.config['URLS'][resource]
path = '%s/%s/%s' % (self.api_prefix, url, lookup['_id'])
with self.__fake_request_url_rule('PATCH', path):
return patch_internal(resource, payload=payload, concurrency_check=concurrency_check,
skip_validation=skip_validation, **lookup)[:4]
def _list_routes(self):
from pprint import pprint
from flask import url_for
def has_no_empty_params(rule):
defaults = rule.defaults if rule.defaults is not None else ()
arguments = rule.arguments if rule.arguments is not None else ()
return len(defaults) >= len(arguments)
links = []
with self.test_request_context():
for rule in self.url_map.iter_rules():
# Filter out rules we can't navigate to in a browser
# and rules that require parameters
if "GET" in rule.methods and has_no_empty_params(rule):
url = url_for(rule.endpoint, **(rule.defaults or {}))
links.append((url, rule.endpoint, rule.methods))
if "PATCH" in rule.methods:
args = {arg: arg for arg in rule.arguments}
url = url_for(rule.endpoint, **args)
links.append((url, rule.endpoint, rule.methods))
links.sort(key=lambda t: (('/api/' in t[0]), len(t[0])))
pprint(links, width=300)
def db(self, collection_name: str = None) \
-> typing.Union[pymongo.collection.Collection, pymongo.database.Database]:
"""Returns the MongoDB database, or the collection (if given)"""
if collection_name:
return self.data.driver.db[collection_name]
return self.data.driver.db
def extension_sidebar_links(self, project):
"""Returns the sidebar links for the given projects.
:returns: HTML as a string for the sidebar.
"""
if not project:
return ''
return jinja2.Markup(''.join(ext.sidebar_links(project)
for ext in self.pillar_extensions.values()))
@contextlib.contextmanager
def __fake_request_url_rule(self, method: str, url_path: str):
"""Tries to force-set the request URL rule.
This is required by Eve (since 0.70) to be able to construct a
Location HTTP header that points to the resource item.
See post_internal, put_internal and patch_internal.
"""
import werkzeug.exceptions as wz_exceptions
with self.test_request_context(method=method, path=url_path) as ctx:
try:
rule, _ = ctx.url_adapter.match(url_path, method=method, return_rule=True)
except (wz_exceptions.MethodNotAllowed, wz_exceptions.NotFound):
# We're POSTing things that we haven't told Eve are POSTable. Try again using the
# GET method.
rule, _ = ctx.url_adapter.match(url_path, method='GET', return_rule=True)
current_request = request._get_current_object()
current_request.url_rule = rule
yield ctx
def validator_for_resource(self, resource_name: str) -> custom_field_validation.ValidateCustomFields:
schema = self.config['DOMAIN'][resource_name]['schema']
validator = self.validator(schema, resource_name)
return validator
def _get_current_app():
"""Returns the current application."""
return flask.current_app
current_app: PillarServer = LocalProxy(_get_current_app)
"""the current app, annotated as PillarServer"""