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"""Handle application level errors."""
import traceback
from werkzeug.exceptions import NotFound
from flask import Flask, request, jsonify, current_app, render_template
from gn_auth.auth.errors import AuthorisationError
def add_trace(exc: Exception, errobj: dict) -> dict:
"""Add the traceback to the error handling object."""
current_app.logger.debug("Endpoint: %s\n%s",
request.url,
traceback.format_exception(exc))
return {
**errobj,
"error-trace": "".join(traceback.format_exception(exc))
}
def page_not_found(exc):
"""404 handler."""
content_type = request.content_type
if bool(content_type) and content_type.lower() == "application/json":
return jsonify(add_trace(exc, {
"error": exc.name,
"error_description": (f"The page '{request.url}' does not exist on "
"this server.")
})), exc.code
return render_template("404.html", page=request.url), exc.code
def handle_general_exception(exc: Exception):
"""Handle generic unhandled exceptions."""
content_type = request.content_type
if bool(content_type) and content_type.lower() == "application/json":
msg = ("The following exception was raised while attempting to access "
f"{request.url}: {' '.join(exc.args)}")
return jsonify(add_trace(exc, {
"error": type(exc).__name__,
"error_description": msg
})), 500
return render_template("50x.html",
page=request.url,
error=exc,
trace=traceback.format_exception(exc)), 500
def handle_authorisation_error(exc: AuthorisationError):
"""Handle AuthorisationError if not handled anywhere else."""
current_app.logger.error(exc)
return jsonify(add_trace(exc, {
"error": type(exc).__name__,
"error_description": " :: ".join(exc.args)
})), exc.error_code
__error_handlers__ = {
NotFound: page_not_found,
Exception: handle_general_exception,
AuthorisationError: handle_authorisation_error
}
def register_error_handlers(app: Flask):
"""Register ALL defined error handlers"""
for class_, error_handler in __error_handlers__.items():
app.register_error_handler(class_, error_handler)
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