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# Copyright (C) 2017 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU General Public License version 3, or any later version
# See top-level LICENSE file for more information
import json
from rest_framework.response import Response
from swh.storage.exc import StorageDBError, StorageAPIError
from swh.web.api import utils
from swh.web.api.exc import NotFoundExc, ForbiddenExc
def compute_link_header(rv, options):
"""Add Link header in returned value results.
Args:
rv (dict): dictionary with keys:
- headers: potential headers with 'link-next' and 'link-prev'
keys
- results: containing the result to return
options (dict): the initial dict to update with result if any
Returns:
dict: dictionary with optional keys 'link-next' and 'link-prev'
"""
link_headers = []
if 'headers' not in rv:
return {}
rv_headers = rv['headers']
if 'link-next' in rv_headers:
link_headers.append('<%s>; rel="next"' % (
rv_headers['link-next']))
if 'link-prev' in rv_headers:
link_headers.append('<%s>; rel="previous"' % (
rv_headers['link-prev']))
if link_headers:
link_header_str = ','.join(link_headers)
headers = options.get('headers', {})
headers.update({
'Link': link_header_str
})
return headers
return {}
def filter_by_fields(request, data):
"""Extract a request parameter 'fields' if it exists to permit the filtering on
he data dict's keys.
If such field is not provided, returns the data as is.
"""
fields = utils.get_query_params(request).get('fields')
if fields:
fields = set(fields.split(','))
data = utils.filter_field_keys(data, fields)
return data
def transform(rv):
"""Transform an eventual returned value with multiple layer of
information with only what's necessary.
If the returned value rv contains the 'results' key, this is the
associated value which is returned.
Otherwise, return the initial dict without the potential 'headers'
key.
"""
if 'results' in rv:
return rv['results']
if 'headers' in rv:
rv.pop('headers')
return rv
def make_api_response(request, data, doc_data={}, options={}):
"""Generates an API response based on the requested mimetype.
Args:
request: a DRF Request object
data: raw data to return in the API response
doc_data: documentation data for HTML response
options: optionnal data that can be used to generate the response
Returns:
a DRF Response a object
"""
if data:
options['headers'] = compute_link_header(data, options)
data = transform(data)
data = filter_by_fields(request, data)
doc_env = doc_data
headers = {}
if 'headers' in options:
doc_env['headers_data'] = options['headers']
headers = options['headers']
# get request status code
doc_env['status_code'] = options.get('status', 200)
response_args = {'status': doc_env['status_code'],
'headers': headers,
'content_type': request.accepted_media_type}
# when requesting HTML, typically when browsing the API through its
# documented views, we need to enrich the input data with documentation
# related ones and inform DRF that we request HTML template rendering
if request.accepted_media_type == 'text/html':
if data:
data = json.dumps(data, sort_keys=True,
indent=4,
separators=(',', ': '))
doc_env['response_data'] = data
doc_env['request'] = request
doc_env['heading'] = utils.shorten_path(str(request.path))
response_args['data'] = doc_env
response_args['template_name'] = 'apidoc.html'
# otherwise simply return the raw data and let DRF picks
# the correct renderer (JSON or YAML)
else:
response_args['data'] = data
return Response(**response_args)
def error_response(request, error, doc_data):
"""Private function to create a custom error response.
Args:
request: a DRF Request object
error: the exception that caused the error
doc_data: documentation data for HTML response
"""
error_code = 400
if isinstance(error, NotFoundExc):
error_code = 404
elif isinstance(error, ForbiddenExc):
error_code = 403
elif isinstance(error, StorageDBError):
error_code = 503
elif isinstance(error, StorageAPIError):
error_code = 503
error_opts = {'status': error_code}
error_data = {
'exception': error.__class__.__name__,
'reason': str(error),
}
return make_api_response(request, error_data, doc_data,
options=error_opts)

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