#!/usr/bin/env python

# Copyright 2012-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.

#

# Licensed under the Apache License, Version 2.0 (the "License"). You

# may not use this file except in compliance with the License. A copy of

# the License is located at

#

# http://aws.amazon.com/apache2.0/

#

# or in the "license" file accompanying this file. This file is

# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF

# ANY KIND, either express or implied. See the License for the specific

# language governing permissions and limitations under the License.

import logging

import os

from botocore.vendored import requests

from awscli.compat import six

from awscli.compat import compat_open

logger = logging.getLogger(__name__)

# These are special cased arguments that do _not_ get the

# special param file processing. This is typically because it

# refers to an actual URI of some sort and we don't want to actually

# download the content (i.e TemplateURL in cloudformation).

PARAMFILE_DISABLED = set([

'cloudformation.create-stack.template-url',

'cloudformation.update-stack.template-url',

'cloudformation.validate-template.template-url',

'cloudformation.estimate-template-cost.template-url',

'cloudformation.create-stack.stack-policy-url',

'cloudformation.update-stack.stack-policy-url',

'cloudformation.set-stack-policy.stack-policy-url',

'sqs.add-permission.queue-url',

'sqs.change-message-visibility.queue-url',

'sqs.change-message-visibility-batch.queue-url',

'sqs.delete-message.queue-url',

'sqs.delete-message-batch.queue-url',

'sqs.delete-queue.queue-url',

'sqs.get-queue-attributes.queue-url',

'sqs.list-dead-letter-source-queues.queue-url',

'sqs.receive-message.queue-url',

'sqs.remove-permission.queue-url',

'sqs.send-message.queue-url',

'sqs.send-message-batch.queue-url',

'sqs.set-queue-attributes.queue-url',

's3.copy-object.website-redirect-location',

's3.create-multipart-upload.website-redirect-location',

's3.put-object.website-redirect-location',

# Double check that this has been renamed!

'sns.subscribe.notification-endpoint',

])

class ResourceLoadingError(Exception):

pass

def get_paramfile(path):

"""

It is possible to pass parameters to operations by referring

to files or URI's. If such a reference is detected, this

function attempts to retrieve the data from the file or URI

and returns it. If there are any errors or if the ``path``

does not appear to refer to a file or URI, a ``None`` is

returned.

"""

data = None

if isinstance(path, six.string_types):

for prefix in PrefixMap:

if path.startswith(prefix):

kwargs = KwargsMap.get(prefix, {})

data = PrefixMap[prefix](prefix, path, **kwargs)

return data

def get_file(prefix, path, mode):

file_path = path[len(prefix):]

file_path = os.path.expanduser(file_path)

file_path = os.path.expandvars(file_path)

if not os.path.isfile(file_path):

raise ResourceLoadingError("file does not exist: %s" % file_path)

try:

with compat_open(file_path, mode) as f:

return f.read()

except (OSError, IOError) as e:

raise ResourceLoadingError('Unable to load paramfile %s: %s' % (

path, e))

def get_uri(prefix, uri):

try:

r = requests.get(uri)

if r.status_code == 200:

return r.text

else:

raise ResourceLoadingError(

"received non 200 status code of %s" % (

r.status_code))

except Exception as e:

raise ResourceLoadingError('Unable to retrieve %s: %s' % (uri, e))

PrefixMap = {'file://': get_file,

'fileb://': get_file,

'http://': get_uri,

'https://': get_uri}

KwargsMap = {'file://': {'mode': 'r'},

'fileb://': {'mode': 'rb'},

'http://': {},

'https://': {}}