patch.py
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patch.py
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	"""Generic node patching support.

	Depends on node_type-specific patch handlers in submodules.
	"""

	import logging

	import werkzeug.exceptions as wz_exceptions
	from flask import Blueprint, request
	from pillar.api.utils import mongo
	from pillar.api.utils import authorization, authentication
	from pillar.api.utils import str2id

	from . import custom

	log = logging.getLogger(__name__)
	blueprint = Blueprint('nodes.patch', __name__)


	@blueprint.route('/<node_id>', methods=['PATCH'])
	@authorization.require_login()
	def patch_node(node_id):
	# Parse the request
	node_id = str2id(node_id)
	patch = request.get_json()

	# Find the node type.
	node = mongo.find_one_or_404('nodes', node_id,
	projection={'node_type': 1})
	try:
	node_type = node['node_type']
	except KeyError:
	msg = 'Node %s has no node_type property' % node_id
	log.warning(msg)
	raise wz_exceptions.InternalServerError(msg)
	log.debug('User %s wants to PATCH %s node %s',
	authentication.current_user_id(), node_type, node_id)

	# Find the PATCH handler for the node type.
	try:
	patch_handler = custom.patch_handlers[node_type]
	except KeyError:
	log.info('No patch handler for node type %r', node_type)
	raise wz_exceptions.MethodNotAllowed('PATCH on node type %r not allowed' % node_type)

	# Let the PATCH handler do its thing.
	return patch_handler(node_id, patch)


	def setup_app(app, url_prefix):
	app.register_api_blueprint(blueprint, url_prefix=url_prefix)