Support non-US plates, prepare to drop localflavor

We also narrow the set of license plate "states" down to just the 50
states and DC. While one should support American Samoa, and US military
plates in the *general* case, they should realistically never come up
when we're recording the license plates of cars that are being used to
drive to New Hampshire from Boston.

Indeed, of the many thousands of cars we have in the system already,
*all* fall under the 50 states or Canada.

We have 42 states represented, including DC. States that are missing:

- Arkansas
- Iowa
- Mississippi
- Nebraska
- North Dakota
- South Dakota
- West Virginia
- Wyoming

To truly drop `localflavor`, we'll need to squash migrations again.

ws/car_states.py

@@ -0,0 +1,70 @@
+"""
+Provide a *simple* enumeration of US states without third-party deps.
+
+We used to rely on `localflavor` for this, but given that plates are
+the *only* use for this enum, it's easy/simple to just enumerate.
+"""
+from typing import Final
+
+US_STATES: Final[tuple[tuple[str, str], ...]] = (
+    ('AL', 'Alabama'),
+    ('AK', 'Alaska'),
+    ('AZ', 'Arizona'),
+    ('AR', 'Arkansas'),
+    ('CA', 'California'),
+    ('CO', 'Colorado'),
+    ('CT', 'Connecticut'),
+    ('DE', 'Delaware'),
+    ('DC', 'District of Columbia'),
+    ('FL', 'Florida'),
+    ('GA', 'Georgia'),
+    ('HI', 'Hawaii'),
+    ('ID', 'Idaho'),
+    ('IL', 'Illinois'),
+    ('IN', 'Indiana'),
+    ('IA', 'Iowa'),
+    ('KS', 'Kansas'),
+    ('KY', 'Kentucky'),
+    ('LA', 'Louisiana'),
+    ('ME', 'Maine'),
+    ('MD', 'Maryland'),
+    ('MA', 'Massachusetts'),
+    ('MI', 'Michigan'),
+    ('MN', 'Minnesota'),
+    ('MS', 'Mississippi'),
+    ('MO', 'Missouri'),
+    ('MT', 'Montana'),
+    ('NE', 'Nebraska'),
+    ('NV', 'Nevada'),
+    ('NH', 'New Hampshire'),
+    ('NJ', 'New Jersey'),
+    ('NM', 'New Mexico'),
+    ('NY', 'New York'),
+    ('NC', 'North Carolina'),
+    ('ND', 'North Dakota'),
+    ('OH', 'Ohio'),
+    ('OK', 'Oklahoma'),
+    ('OR', 'Oregon'),
+    ('PA', 'Pennsylvania'),
+    ('RI', 'Rhode Island'),
+    ('SC', 'South Carolina'),
+    ('SD', 'South Dakota'),
+    ('TN', 'Tennessee'),
+    ('TX', 'Texas'),
+    ('UT', 'Utah'),
+    ('VT', 'Vermont'),
+    ('VA', 'Virginia'),
+    ('WA', 'Washington'),
+    ('WV', 'West Virginia'),
+    ('WI', 'Wisconsin'),
+    ('WY', 'Wyoming'),
+)
+
+
+CAR_STATE_CHOICES: Final[tuple[tuple[str, str], ...]] = (
+    *US_STATES,
+    # License plates are *only* used for search & rescue
+    # So long as the plate number is correct, we needn't be more specific.
+    # In nine years, we've only seen one Canadian license plate requested.
+    ('XX', 'Other (Canada, Mexico, etc.)'),
+)

ws/forms.py

@@ -4,7 +4,6 @@
 from django import forms
 from django.core.exceptions import ValidationError
 from django.db.models.fields import TextField
-from localflavor.us.us_states import US_STATES
 from mitoc_const import affiliations
 
 from ws import enums, models, widgets
@@ -165,7 +164,6 @@ class Meta:
         model = models.Car
         fields = ['license_plate', 'state', 'make', 'model', 'year', 'color']
         widgets = {
-            'state': forms.Select(choices=US_STATES),
             'year': forms.NumberInput(
                 attrs={'min': model.year_min, 'max': model.year_max}
             ),

ws/migrations/0056_car.py

@@ -0,0 +1,85 @@
+# Generated by Django 3.2.21 on 2023-10-02 13:42
+
+import django.core.validators
+import django.db.models.manager
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('ws', '0055_discount_url_non_null'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='car',
+            name='state',
+            field=models.CharField(
+                choices=[
+                    ('AL', 'Alabama'),
+                    ('AK', 'Alaska'),
+                    ('AZ', 'Arizona'),
+                    ('AR', 'Arkansas'),
+                    ('CA', 'California'),
+                    ('CO', 'Colorado'),
+                    ('CT', 'Connecticut'),
+                    ('DE', 'Delaware'),
+                    ('DC', 'District of Columbia'),
+                    ('FL', 'Florida'),
+                    ('GA', 'Georgia'),
+                    ('HI', 'Hawaii'),
+                    ('ID', 'Idaho'),
+                    ('IL', 'Illinois'),
+                    ('IN', 'Indiana'),
+                    ('IA', 'Iowa'),
+                    ('KS', 'Kansas'),
+                    ('KY', 'Kentucky'),
+                    ('LA', 'Louisiana'),
+                    ('ME', 'Maine'),
+                    ('MD', 'Maryland'),
+                    ('MA', 'Massachusetts'),
+                    ('MI', 'Michigan'),
+                    ('MN', 'Minnesota'),
+                    ('MS', 'Mississippi'),
+                    ('MO', 'Missouri'),
+                    ('MT', 'Montana'),
+                    ('NE', 'Nebraska'),
+                    ('NV', 'Nevada'),
+                    ('NH', 'New Hampshire'),
+                    ('NJ', 'New Jersey'),
+                    ('NM', 'New Mexico'),
+                    ('NY', 'New York'),
+                    ('NC', 'North Carolina'),
+                    ('ND', 'North Dakota'),
+                    ('OH', 'Ohio'),
+                    ('OK', 'Oklahoma'),
+                    ('OR', 'Oregon'),
+                    ('PA', 'Pennsylvania'),
+                    ('RI', 'Rhode Island'),
+                    ('SC', 'South Carolina'),
+                    ('SD', 'South Dakota'),
+                    ('TN', 'Tennessee'),
+                    ('TX', 'Texas'),
+                    ('UT', 'Utah'),
+                    ('VT', 'Vermont'),
+                    ('VA', 'Virginia'),
+                    ('WA', 'Washington'),
+                    ('WV', 'West Virginia'),
+                    ('WI', 'Wisconsin'),
+                    ('WY', 'Wyoming'),
+                    ('XX', 'Other (Canada, Mexico, etc.)'),
+                ],
+                max_length=2,
+            ),
+        ),
+        migrations.AlterField(
+            model_name='car',
+            name='year',
+            field=models.PositiveIntegerField(
+                validators=[
+                    django.core.validators.MaxValueValidator(2025),
+                    django.core.validators.MinValueValidator(1903),
+                ]
+            ),
+        ),
+    ]

ws/models.py

@@ -21,14 +21,14 @@
 from django.utils import timezone
 from django.utils.safestring import mark_safe
 from django.utils.text import format_lazy
-from localflavor.us.models import USStateField
 from mitoc_const import affiliations
 from mitoc_const.membership import RENEWAL_ALLOWED_WITH_DAYS_LEFT
 from phonenumber_field.modelfields import PhoneNumberField
 from typing_extensions import Self
 
 import ws.utils.dates as date_utils
 from ws import enums
+from ws.car_states import CAR_STATE_CHOICES
 from ws.utils.avatar import avatar_url
 
 alphanum = RegexValidator(
@@ -63,7 +63,7 @@ class Car(models.Model):
     year_min, year_max = 1903, date_utils.local_now().year + 2
     # Loosely validate - may wish to use international plates in the future
     license_plate = models.CharField(max_length=31, validators=[alphanum])
-    state = USStateField()
+    state = models.CharField(max_length=2, choices=CAR_STATE_CHOICES)
     make = models.CharField(max_length=63)
     model = models.CharField(max_length=63)
     year = models.PositiveIntegerField(