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Apply decorator to validate request on route functions. #5947

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Apply decorator to validate request on route functions. #5947

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281023a
Modify decorator to set preferred_locale in dto class using header ac…
Aadesh-Baral Jun 27, 2023
2a1ab0c
Fix serialized name handling in validate_request decorator
Aadesh-Baral Jun 27, 2023
21558f1
Update decorator to handle invalid/empty json body.
Aadesh-Baral Jun 28, 2023
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32 changes: 24 additions & 8 deletions backend/models/dtos/__init__.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
from functools import wraps
from flask import request
from schematics.exceptions import DataError

from werkzeug.exceptions import BadRequest as WerkzeugBadRequest

from backend.exceptions import BadRequest

Expand Down Expand Up @@ -32,20 +32,36 @@ def wrapper(*args, **kwargs):

try:
dto = dto_class()
try:
body = request.json if request.is_json else {}
except (
WerkzeugBadRequest
): # If request body does not contain valid JSON then BadRequest is raised by Flask
body = {}

# Set attribute values from request body, query parameters, and path parameters
for attr in dto.__class__._fields:
if request.is_json and attr in request.json:
setattr(dto, attr, request.json[attr])
elif attr in request.args:
setattr(dto, attr, request.args.get(attr))
elif attr in kwargs:
setattr(dto, attr, kwargs[attr])
# Get serialized name of attr if exists otherwise use attr name
field = dto.__class__._fields[attr]
attr_name = field.serialized_name if field.serialized_name else attr

# Set attribute value from request body, query parameters, or path parameters
if attr_name in body:
setattr(dto, attr, body[attr_name])
elif attr_name in request.args:
setattr(dto, attr, request.args.get(attr_name))
elif attr_name in kwargs:
setattr(dto, attr, kwargs[attr_name])

# Set authenticated user id if user_id is a field in the DTO
if "user_id" in dto.__class__._fields:
dto.user_id = token_auth.current_user()

# Get accepted language from request header
if "preferred_locale" in dto.__class__._fields:
dto.preferred_locale = request.environ.get(
"HTTP_ACCEPT_LANGUAGE", "en"
)

dto.validate()
request.validated_dto = (
dto # Set validated DTO on request object for use in view function
Expand Down