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from flask._compat import string_types
import importlib
def perform_imports(val, setting_name):
"""
If the given setting is a string import notation,
then perform the necessary import or imports.
"""
if isinstance(val, string_types):
return import_from_string(val, setting_name)
elif isinstance(val, (list, tuple)):
return [perform_imports(item, setting_name) for item in val]
return val
def import_from_string(val, setting_name):
"""
Attempt to import a class from a string representation.
"""
try:
# Nod to tastypie's use of importlib.
parts = val.split('.')
module_path, class_name = '.'.join(parts[:-1]), parts[-1]
module = importlib.import_module(module_path)
return getattr(module, class_name)
except ImportError as exc:
format = "Could not import '%s' for API setting '%s'. %s."
msg = format % (val, setting_name, exc)
raise ImportError(msg)
class APISettings(object):
def __init__(self, user_config=None):
self.user_config = user_config or {}
@property
def DEFAULT_PARSERS(self):
default = [
'flask_api.parsers.JSONParser',
'flask_api.parsers.URLEncodedParser',
'flask_api.parsers.MultiPartParser'
]
val = self.user_config.get('DEFAULT_PARSERS', default)
return perform_imports(val, 'DEFAULT_PARSERS')
@property
def DEFAULT_RENDERERS(self):
default = [
'flask_api.renderers.JSONRenderer',
'flask_api.renderers.BrowsableAPIRenderer'
]
val = self.user_config.get('DEFAULT_RENDERERS', default)
return perform_imports(val, 'DEFAULT_RENDERERS')
default_settings = APISettings()
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