Remove iso8601 dependency

As of Python 3.11 this is a built in method so we don’t need an
external dependency

https://docs.python.org/3/library/datetime.html#datetime.date.fromisoformat

Author: quis

app/celery/process_ses_receipts_tasks.py

@@ -1,7 +1,6 @@
 import logging
 from datetime import datetime, timedelta
 
-import iso8601
 from celery.exceptions import Retry
 from flask import current_app, json
 from sqlalchemy.orm.exc import NoResultFound
@@ -42,7 +41,7 @@ def process_ses_results(self, response):
         try:
             notification = notifications_dao.dao_get_notification_or_history_by_reference(reference=reference)
         except NoResultFound:
-            message_time = iso8601.parse_date(ses_message["mail"]["timestamp"]).replace(tzinfo=None)
+            message_time = datetime.fromisoformat(ses_message["mail"]["timestamp"]).replace(tzinfo=None)
             if datetime.utcnow() - message_time < timedelta(minutes=5):
                 extra = {"notification_reference": reference, "notification_status": notification_status}
                 current_app.logger.info(

app/notifications/receive_notifications.py

@@ -1,7 +1,6 @@
 from datetime import datetime
 from urllib.parse import unquote
 
-import iso8601
 from flask import Blueprint, abort, current_app, jsonify, request
 from gds_metrics.metrics import Counter
 
@@ -142,9 +141,9 @@ def format_mmg_datetime(date):
     """
     try:
         orig_date = format_mmg_message(date)
-        parsed_datetime = iso8601.parse_date(orig_date).replace(tzinfo=None)
+        parsed_datetime = datetime.fromisoformat(orig_date).replace(tzinfo=None)
         return parsed_datetime
-    except iso8601.ParseError:
+    except ValueError:
         return datetime.utcnow()
 
 

app/schema_validation/__init__.py

@@ -3,7 +3,6 @@
 from datetime import datetime, timedelta
 from uuid import UUID
 
-from iso8601 import ParseError, iso8601
 from jsonschema import Draft7Validator, FormatChecker, ValidationError
 from notifications_utils.recipient_validation.email_address import validate_email_address
 from notifications_utils.recipient_validation.errors import InvalidEmailError, InvalidPhoneError
@@ -67,12 +66,12 @@ def validate_schema_postage_including_international(instance):
 def validate_schema_date_with_hour(instance):
     if isinstance(instance, str):
         try:
-            dt = iso8601.parse_date(instance).replace(tzinfo=None)
+            dt = datetime.fromisoformat(instance).replace(tzinfo=None)
             if dt < datetime.utcnow():
                 raise ValidationError("datetime can not be in the past")
             if dt > datetime.utcnow() + timedelta(hours=24):
                 raise ValidationError("datetime can only be 24 hours in the future")
-        except ParseError as e:
+        except ValueError as e:
             raise ValidationError(
                 "datetime format is invalid. It must be a valid ISO8601 date time format, "
                 "https://en.wikipedia.org/wiki/ISO_8601"

requirements.in

@@ -11,7 +11,6 @@ flask-sqlalchemy==3.1.1
 click-datetime~=0.2
 gunicorn[eventlet]~=25.1
 eventlet~=0.40.4
-iso8601~=2.1
 jsonschema[format]==4.23.0
 marshmallow-sqlalchemy==1.0.0
 marshmallow==3.21.3

requirements.txt

@@ -106,8 +106,6 @@ idna==3.11
     # via
     #   jsonschema
     #   requests
-iso8601==2.1.0
-    # via -r requirements.in
 isoduration==20.11.0
     # via jsonschema
 itsdangerous==2.2.0

requirements_for_test.txt

@@ -162,8 +162,6 @@ idna==3.11
     #   trustme
 iniconfig==2.3.0
     # via pytest
-iso8601==2.1.0
-    # via -r requirements.txt
 isoduration==20.11.0
     # via -r requirements.txt
 itsdangerous==2.2.0