stages/identification: add case_insensitive_matching

closes #248

passbook/stages/identification/api.py

@@ -15,6 +15,7 @@ class IdentificationStageSerializer(ModelSerializer):
             "pk",
             "name",
             "user_fields",
+            "case_insensitive_matching",
             "template",
             "enrollment_flow",
             "recovery_flow",

passbook/stages/identification/forms.py

@@ -27,7 +27,14 @@ class IdentificationStageForm(forms.ModelForm):
     class Meta:
 
         model = IdentificationStage
-        fields = ["name", "user_fields", "template", "enrollment_flow", "recovery_flow"]
+        fields = [
+            "name",
+            "user_fields",
+            "case_insensitive_matching",
+            "template",
+            "enrollment_flow",
+            "recovery_flow",
+        ]
         widgets = {
             "name": forms.TextInput(),
             "user_fields": FilteredSelectMultiple(

passbook/stages/identification/migrations/0004_identificationstage_case_insensitive_matching.py

@@ -0,0 +1,21 @@
+# Generated by Django 3.1.1 on 2020-09-30 21:44
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("passbook_stages_identification", "0003_auto_20200615_1641"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="identificationstage",
+            name="case_insensitive_matching",
+            field=models.BooleanField(
+                default=True,
+                help_text="When enabled, user fields are matched regardless of their casing.",
+            ),
+        ),
+    ]

passbook/stages/identification/models.py

@@ -34,6 +34,13 @@ class IdentificationStage(Stage):
     )
     template = models.TextField(choices=Templates.choices)
 
+    case_insensitive_matching = models.BooleanField(
+        default=True,
+        help_text=_(
+            "When enabled, user fields are matched regardless of their casing."
+        ),
+    )
+
     enrollment_flow = models.ForeignKey(
         Flow,
         on_delete=models.SET_DEFAULT,

passbook/stages/identification/stage.py

@@ -70,7 +70,12 @@ class IdentificationStageView(FormView, StageView):
         current_stage: IdentificationStage = self.executor.current_stage
         query = Q()
         for search_field in current_stage.user_fields:
-            query |= Q(**{search_field: uid_value})
+            model_field = search_field
+            if current_stage.case_insensitive_matching:
+                model_field += "__iexact"
+            else:
+                model_field += "__exact"
+            query |= Q(**{model_field: uid_value})
         users = User.objects.filter(query)
         if users.exists():
             LOGGER.debug("Found user", user=users.first(), query=query)