/
base.py
745 lines (652 loc) · 26.3 KB
/
base.py
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"""
What's the big idea?
An endpoint that traverses all restful endpoints producing a swagger 2.0 schema
If a swagger yaml description is found in the docstrings for an endpoint
we add the endpoint to swagger specification output
"""
import re
import os
import codecs
import yaml
try:
import simplejson as json
except ImportError:
import json
from functools import wraps, partial
from collections import defaultdict
from flask import Blueprint
from flask import Markup
from flask import current_app
from flask import jsonify
from flask import redirect
from flask import render_template
from flask import request, url_for
from flask import abort
from flask.views import MethodView
from flask.json import JSONEncoder
try:
from flask_restful.reqparse import RequestParser
except ImportError:
RequestParser = None
import jsonschema
from mistune import markdown
from .constants import OPTIONAL_FIELDS
from .utils import extract_definitions
from .utils import get_specs
from .utils import get_schema_specs
from .utils import parse_definition_docstring
from .utils import parse_imports
from .utils import get_vendor_extension_fields
from .utils import validate
from .utils import LazyString
from . import __version__
def NO_SANITIZER(text):
return text
def BR_SANITIZER(text):
return text.replace('\n', '<br/>') if text else text
def MK_SANITIZER(text):
return Markup(markdown(text)) if text else text
class APIDocsView(MethodView):
"""
The /apidocs
"""
def __init__(self, *args, **kwargs):
view_args = kwargs.pop('view_args', {})
self.config = view_args.get('config')
super(APIDocsView, self).__init__(*args, **kwargs)
def get(self):
"""
The data under /apidocs
json or Swagger UI
"""
base_endpoint = self.config.get('endpoint', 'flasgger')
specs = [
{
"url": url_for(".".join((base_endpoint, spec['endpoint']))),
"title": spec.get('title', 'API Spec 1'),
"version": spec.get("version", '0.0.1'),
"endpoint": spec.get('endpoint')
}
for spec in self.config.get('specs', [])
]
data = {
"specs": specs,
"title": self.config.get('title', 'Flasgger')
}
if request.args.get('json'):
# calling with ?json returns specs
return jsonify(data)
else: # pragma: no cover
data['flasgger_config'] = self.config
data['json'] = json
data['flasgger_version'] = __version__
data['favicon'] = self.config.get(
'favicon',
url_for('flasgger.static', filename='favicon-32x32.png')
)
data['swagger_ui_bundle_js'] = self.config.get(
'swagger_ui_bundle_js',
url_for('flasgger.static', filename='swagger-ui-bundle.js')
)
data['swagger_ui_standalone_preset_js'] = self.config.get(
'swagger_ui_standalone_preset_js',
url_for('flasgger.static',
filename='swagger-ui-standalone-preset.js')
)
data['jquery_js'] = self.config.get(
'jquery_js',
url_for('flasgger.static', filename='lib/jquery.min.js')
)
data['swagger_ui_css'] = self.config.get(
'swagger_ui_css',
url_for('flasgger.static', filename='swagger-ui.css')
)
return render_template(
'flasgger/index.html',
**data
)
class APISpecsView(MethodView):
"""
The /apispec_1.json and other specs
"""
def __init__(self, *args, **kwargs):
self.loader = kwargs.pop('loader')
super(APISpecsView, self).__init__(*args, **kwargs)
def get(self):
"""
The Swagger view get method outputs to /apispecs_1.json
"""
return jsonify(self.loader())
class SwaggerDefinition(object):
"""
Class based definition
"""
def __init__(self, name, obj, tags=None):
self.name = name
self.obj = obj
self.tags = tags or []
class Swagger(object):
DEFAULT_CONFIG = {
"headers": [
],
"specs": [
{
"endpoint": 'apispec_1',
"route": '/apispec_1.json',
"rule_filter": lambda rule: True, # all in
"model_filter": lambda tag: True, # all in
}
],
"static_url_path": "/flasgger_static",
# "static_folder": "static", # must be set by user
"swagger_ui": True,
"specs_route": "/apidocs/"
}
SCHEMA_TYPES = {'string': str, 'integer': int, 'number': float,
'boolean': bool}
SCHEMA_LOCATIONS = {'query': 'args', 'header': 'headers',
'formData': 'form', 'body': 'json', 'path': 'path'}
def __init__(
self, app=None, config=None, sanitizer=None, template=None,
template_file=None, decorators=None, validation_function=None,
validation_error_handler=None, parse=False):
self._configured = False
self.endpoints = []
self.definition_models = [] # not in app, so track here
self.sanitizer = sanitizer or BR_SANITIZER
self.config = config or self.DEFAULT_CONFIG.copy()
self.template = template
self.template_file = template_file
self.decorators = decorators
self.validation_function = validation_function
self.validation_error_handler = validation_error_handler
self.apispecs = {} # cached apispecs
self.parse = parse
if app:
self.init_app(app)
def init_app(self, app, decorators=None):
"""
Initialize the app with Swagger plugin
"""
self.decorators = decorators or self.decorators
self.app = app
self.load_config(app)
# self.load_apispec(app)
if self.template_file is not None:
self.template = self.load_swagger_file(self.template_file)
self.register_views(app)
self.add_headers(app)
if self.parse:
if RequestParser is None:
raise RuntimeError('Please install flask_restful')
self.parsers = {}
self.schemas = {}
self.format_checker = jsonschema.FormatChecker()
self.parse_request(app)
self._configured = True
app.swag = self
def load_swagger_file(self, filename):
if not filename.startswith('/'):
filename = os.path.join(
self.app.root_path,
filename
)
if filename.endswith('.json'):
loader = json.load
elif filename.endswith('.yml') or filename.endswith('.yaml'):
loader = lambda stream: \
yaml.safe_load(parse_imports(stream.read(), filename))
else:
with codecs.open(filename, 'r', 'utf-8') as f:
contents = f.read()
contents = contents.strip()
if contents[0] in ['{', '[']:
loader = json.load
else:
loader = lambda stream: \
yaml.safe_load(parse_imports(stream.read(), filename))
with codecs.open(filename, 'r', 'utf-8') as f:
return loader(f)
@property
def configured(self):
"""
Return if `init_app` is configured
"""
return self._configured
def get_url_mappings(self, rule_filter=None):
"""
Returns all werkzeug rules
"""
rule_filter = rule_filter or (lambda rule: True)
app_rules = [
rule for rule in current_app.url_map.iter_rules()
if rule_filter(rule)
]
return app_rules
def get_def_models(self, definition_filter=None):
"""
Used for class based definitions
"""
model_filter = definition_filter or (lambda tag: True)
return {
definition.name: definition.obj
for definition in self.definition_models
if model_filter(definition)
}
def get_apispecs(self, endpoint='apispec_1'):
if not self.app.debug and endpoint in self.apispecs:
return self.apispecs[endpoint]
spec = None
for _spec in self.config['specs']:
if _spec['endpoint'] == endpoint:
spec = _spec
break
if not spec:
raise RuntimeError(
'Can`t find specs by endpoint {:d},'
' check your flasger`s config'.format(endpoint))
data = {
# try to get from config['SWAGGER']['info']
# then config['SWAGGER']['specs'][x]
# then config['SWAGGER']
# then default
"info": self.config.get('info') or {
"version": spec.get(
'version', self.config.get('version', "0.0.1")
),
"title": spec.get(
'title', self.config.get('title', "A swagger API")
),
"description": spec.get(
'description', self.config.get('description',
"powered by Flasgger")
),
"termsOfService": spec.get(
'termsOfService', self.config.get('termsOfService',
"/tos")
),
},
"paths": self.config.get('paths') or defaultdict(dict),
"definitions": self.config.get('definitions') or defaultdict(dict)
}
openapi_version = self.config.get('openapi')
if openapi_version:
data["openapi"] = openapi_version
else:
data["swagger"] = self.config.get('swagger') or self.config.get(
'swagger_version', "2.0"
)
# Support extension properties in the top level config
top_level_extension_options = get_vendor_extension_fields(self.config)
if top_level_extension_options:
data.update(top_level_extension_options)
# if True schemaa ids will be prefized by function_method_{id}
# for backwards compatibility with <= 0.5.14
prefix_ids = self.config.get('prefix_ids')
if self.config.get('host'):
data['host'] = self.config.get('host')
if self.config.get("basePath"):
data["basePath"] = self.config.get('basePath')
if self.config.get('schemes'):
data['schemes'] = self.config.get('schemes')
if self.config.get("securityDefinitions"):
data["securityDefinitions"] = self.config.get(
'securityDefinitions'
)
def is_openapi3():
"""
Returns True if openapi_version is 3
"""
return openapi_version and openapi_version.split('.')[0] == '3'
# enable 'components' when openapi_version is 3.*.*
if is_openapi3() and self.config.get("components"):
data["components"] = self.config.get(
'components'
)
# set defaults from template
if self.template is not None:
data.update(self.template)
paths = data['paths']
definitions = data['definitions']
ignore_verbs = set(
self.config.get('ignore_verbs', ("HEAD", "OPTIONS"))
)
# technically only responses is non-optional
optional_fields = self.config.get('optional_fields') or OPTIONAL_FIELDS
for name, def_model in self.get_def_models(
spec.get('definition_filter')).items():
description, swag = parse_definition_docstring(
def_model, self.sanitizer)
if name and swag:
if description:
swag.update({'description': description})
definitions[name].update(swag)
specs = get_specs(
self.get_url_mappings(spec.get('rule_filter')), ignore_verbs,
optional_fields, self.sanitizer,
doc_dir=self.config.get('doc_dir'))
http_methods = ['get', 'post', 'put', 'delete']
for rule, verbs in specs:
operations = dict()
for verb, swag in verbs:
update_dict = swag.get('definitions', {})
if type(update_dict) == list and type(update_dict[0]) == dict:
# pop, assert single element
update_dict, = update_dict
definitions.update(update_dict)
defs = [] # swag.get('definitions', [])
defs += extract_definitions(
defs, endpoint=rule.endpoint, verb=verb,
prefix_ids=prefix_ids
)
params = swag.get('parameters', [])
if verb in swag.keys():
verb_swag = swag.get(verb)
if len(params) == 0 and verb.lower() in http_methods:
params = verb_swag.get('parameters', [])
defs += extract_definitions(params,
endpoint=rule.endpoint,
verb=verb,
prefix_ids=prefix_ids)
request_body = swag.get('requestBody')
if request_body:
content = request_body.get("content", {})
extract_definitions(
list(content.values()),
endpoint=rule.endpoint,
verb=verb,
prefix_ids=prefix_ids
)
callbacks = swag.get("callbacks", {})
if callbacks:
callbacks = {
str(key): value
for key, value in callbacks.items()
}
extract_definitions(
list(callbacks.values()),
endpoint=rule.endpoint,
verb=verb,
prefix_ids=prefix_ids
)
responses = None
if 'responses' in swag:
responses = swag.get('responses', {})
responses = {
str(key): value
for key, value in responses.items()
}
if responses is not None:
defs = defs + extract_definitions(
responses.values(),
endpoint=rule.endpoint,
verb=verb,
prefix_ids=prefix_ids
)
for definition in defs:
if 'id' not in definition:
definitions.update(definition)
continue
def_id = definition.pop('id')
if def_id is not None:
definitions[def_id].update(definition)
operation = {}
if swag.get('summary'):
operation['summary'] = swag.get('summary')
if swag.get('description'):
operation['description'] = swag.get('description')
if request_body:
operation['requestBody'] = request_body
if callbacks:
operation['callbacks'] = callbacks
if responses:
operation['responses'] = responses
# parameters - swagger ui dislikes empty parameter lists
if len(params) > 0:
operation['parameters'] = params
# other optionals
for key in optional_fields:
if key in swag:
value = swag.get(key)
if key in ('produces', 'consumes'):
if not isinstance(value, (list, tuple)):
value = [value]
operation[key] = value
operations[verb] = operation
if len(operations):
try:
# Add reverse proxy prefix to route
prefix = self.template['swaggerUiPrefix']
except (KeyError, TypeError):
prefix = ''
srule = '{0}{1}'.format(prefix, rule)
# old regex '(<(.*?\:)?(.*?)>)'
for arg in re.findall('(<([^<>]*:)?([^<>]*)>)', srule):
srule = srule.replace(arg[0], '{%s}' % arg[2])
for key, val in operations.items():
if srule not in paths:
paths[srule] = {}
if key in paths[srule]:
paths[srule][key].update(val)
else:
paths[srule][key] = val
self.apispecs[endpoint] = data
return data
def definition(self, name, tags=None):
"""
Decorator to add class based definitions
"""
def wrapper(obj):
self.definition_models.append(SwaggerDefinition(name, obj,
tags=tags))
return obj
return wrapper
def load_config(self, app):
"""
Copy config from app
"""
self.config.update(app.config.get('SWAGGER', {}))
def register_views(self, app):
"""
Register Flasgger views
"""
# Wrap the views in an arbitrary number of decorators.
def wrap_view(view):
if self.decorators:
for decorator in self.decorators:
view = decorator(view)
return view
if self.config.get('swagger_ui', True):
uiversion = self.config.get('uiversion', 3)
blueprint = Blueprint(
self.config.get('endpoint', 'flasgger'),
__name__,
url_prefix=self.config.get('url_prefix', None),
subdomain=self.config.get('subdomain', None),
template_folder=self.config.get(
'template_folder', 'ui{0}/templates'.format(uiversion)
),
static_folder=self.config.get(
'static_folder', 'ui{0}/static'.format(uiversion)
),
static_url_path=self.config.get('static_url_path', None)
)
blueprint.add_url_rule(
self.config.get('specs_route', '/apidocs/'),
'apidocs',
view_func=wrap_view(APIDocsView().as_view(
'apidocs',
view_args=dict(config=self.config)
))
)
# backwards compatibility with old url style
blueprint.add_url_rule(
'/apidocs/index.html',
view_func=lambda: redirect(url_for('flasgger.apidocs'))
)
else:
blueprint = Blueprint(
self.config.get('endpoint', 'flasgger'),
__name__
)
for spec in self.config['specs']:
self.endpoints.append(spec['endpoint'])
blueprint.add_url_rule(
spec['route'],
spec['endpoint'],
view_func=wrap_view(APISpecsView.as_view(
spec['endpoint'],
loader=partial(
self.get_apispecs, endpoint=spec['endpoint'])
))
)
app.register_blueprint(blueprint)
def add_headers(self, app):
"""
Inject headers after request
"""
@app.after_request
def after_request(response): # noqa
for header, value in self.config.get('headers'):
response.headers[header] = value
return response
def parse_request(self, app):
@app.before_request
def before_request(): # noqa
"""
Parse and validate request data(query, form, header and body),
set data to `request.parsed_data`
"""
# convert "/api/items/<int:id>/" to "/api/items/{id}/"
subs = []
for sub in str(request.url_rule).split('/'):
if '<' in sub:
if ':' in sub:
start = sub.index(':') + 1
else:
start = 1
subs.append('{{{:s}}}'.format(sub[start:-1]))
else:
subs.append(sub)
path = '/'.join(subs)
path_key = path + request.method.lower()
if not self.app.debug and path_key in self.parsers:
parsers = self.parsers[path_key]
schemas = self.schemas[path_key]
else:
doc = None
definitions = None
for spec in self.config['specs']:
apispec = self.get_apispecs(endpoint=spec['endpoint'])
if path in apispec['paths']:
if request.method.lower() in apispec['paths'][path]:
doc = apispec['paths'][path][
request.method.lower()]
definitions = apispec.get('definitions', {})
break
if not doc:
return
parsers = defaultdict(RequestParser)
schemas = defaultdict(
lambda: {'type': 'object', 'properties': defaultdict(dict)}
)
for param in doc.get('parameters', []):
location = self.SCHEMA_LOCATIONS[param['in']]
if location == 'json': # load data from 'request.json'
schemas[location] = param['schema']
schemas[location]['definitions'] = dict(definitions)
else:
name = param['name']
if location != 'path':
parsers[location].add_argument(
name,
type=self.SCHEMA_TYPES[
param.get('type', None)],
required=param.get('required', False),
location=self.SCHEMA_LOCATIONS[
param['in']],
store_missing=False)
for k in param:
if k != 'required':
schemas[
location]['properties'][name][k] = param[k]
self.schemas[path_key] = schemas
self.parsers[path_key] = parsers
parsed_data = {'path': request.view_args}
for location in parsers.keys():
parsed_data[location] = parsers[location].parse_args()
if 'json' in schemas:
parsed_data['json'] = request.json or {}
for location, data in parsed_data.items():
try:
jsonschema.validate(
data, schemas[location],
format_checker=self.format_checker)
except jsonschema.ValidationError as e:
abort(400, e.message)
setattr(request, 'parsed_data', parsed_data)
def validate(
self, schema_id, validation_function=None,
validation_error_handler=None):
"""
A decorator that is used to validate incoming requests data
against a schema
swagger = Swagger(app)
@app.route('/pets', methods=['POST'])
@swagger.validate('Pet')
@swag_from("pet_post_endpoint.yml")
def post():
return db.insert(request.data)
This annotation only works if the endpoint is already swagged,
i.e. placing @swag_from above @validate or not declaring the
swagger specifications in the method's docstring *won't work*
Naturally, if you use @app.route annotation it still needs to
be the outermost annotation
:param schema_id: the id of the schema with which the data will
be validated
:param validation_function: custom validation function which
takes the positional arguments: data to be validated at
first and schema to validate against at second
:param validation_error_handler: custom function to handle
exceptions thrown when validating which takes the exception
thrown as the first, the data being validated as the second
and the schema being used to validate as the third argument
"""
if validation_function is None:
validation_function = self.validation_function
if validation_error_handler is None:
validation_error_handler = self.validation_error_handler
def decorator(func):
@wraps(func)
def wrapper(*args, **kwargs):
specs = get_schema_specs(schema_id, self)
validate(
schema_id=schema_id, specs=specs,
validation_function=validation_function,
validation_error_handler=validation_error_handler)
return func(*args, **kwargs)
return wrapper
return decorator
def get_schema(self, schema_id):
"""
This method finds a schema known to Flasgger and returns it.
:raise KeyError: when the specified :param schema_id: is not
found by Flasgger
:param schema_id: the id of the desired schema
"""
schema_specs = get_schema_specs(schema_id, self)
if schema_specs is None:
raise KeyError(
'Specified schema_id \'{0}\' not found'.format(schema_id))
for schema in (
parameter.get('schema') for parameter in
schema_specs['parameters']):
if schema is not None and schema.get('id').lower() == schema_id:
return schema
# backwards compatibility
Flasgger = Swagger # noqa
class LazyJSONEncoder(JSONEncoder):
def default(self, obj):
if isinstance(obj, LazyString):
return str(obj)
return super(LazyJSONEncoder, self).default(obj)