add debug zone to auto create page

app/dashboard/templates/dashboard/domain_detail/auto-create.html

@@ -125,6 +125,39 @@
 
     </div>
 
+    <div id="debug-zone">
+      <hr>
+      <h3>Debug Zone</h3>
+      <p>You can test whether an alias will be automatically created given the rules above </p>
+      <div class="alert alert-info">
+        No worries, no alias will be created during the test :)
+      </div>
+      <form method="post" action="#debug-zone">
+        <input type="hidden" name="form-name" value="test-auto-create-rule">
+        {{ auto_create_test_form.csrf_token }}
+
+        <div class="d-flex">
+          <div class="form-group d-flex">
+            {{ auto_create_test_form.local(class="form-control", type="text", placeholder="local", value=auto_create_test_local) }}
+            {{ render_field_errors(auto_create_test_form.local) }}
+            <b class="pt-2 ml-1">@{{ custom_domain.domain }}</b>
+          </div>
+          <div>
+
+          </div>
+        </div>
+        <div class="form-group">
+          <button class="btn btn-outline-primary">Test</button>
+        </div>
+      </form>
+
+      {% if auto_create_test_result %}
+      <div class="alert {% if auto_create_test_passed %} alert-success {% else %} alert-warning {% endif %}">
+          {{ auto_create_test_result }}
+        </div>
+      {% endif %}
+    </div>
+
   </div>
 
 

app/dashboard/views/domain_detail.py

@@ -1,3 +1,4 @@
+import re
 from threading import Thread
 
 from flask import render_template, request, redirect, url_for, flash
@@ -382,6 +383,12 @@ class AutoCreateRuleForm(FlaskForm):
     )
 
 
+class AutoCreateTestForm(FlaskForm):
+    local = StringField(
+        "local part", validators=[validators.DataRequired(), validators.Length(max=128)]
+    )
+
+
 @dashboard_bp.route(
     "/domains/<int:custom_domain_id>/auto-create", methods=["GET", "POST"]
 )
@@ -391,6 +398,13 @@ def domain_detail_auto_create(custom_domain_id):
     mailboxes = current_user.mailboxes()
     new_auto_create_rule_form = AutoCreateRuleForm()
 
+    auto_create_test_form = AutoCreateTestForm()
+    auto_create_test_local, auto_create_test_result, auto_create_test_passed = (
+        "",
+        "",
+        False,
+    )
+
     if not custom_domain or custom_domain.user_id != current_user.id:
         flash("You cannot see this page", "warning")
         return redirect(url_for("dashboard.index"))
@@ -476,6 +490,28 @@ def domain_detail_auto_create(custom_domain_id):
             AutoCreateRule.delete(rule_id)
             db.session.commit()
             flash(f"Rule #{rule_order} has been deleted", "success")
+        elif request.form.get("form-name") == "test-auto-create-rule":
+            if auto_create_test_form.validate():
+                local = auto_create_test_form.local.data
+                auto_create_test_local = local
+
+                for rule in custom_domain.auto_create_rules:
+                    rule: AutoCreateRule
+                    regex = re.compile(rule.regex)
+                    if re.fullmatch(regex, local):
+                        auto_create_test_result = (
+                            f"{local}@{custom_domain.domain} passes rule #{rule.order}"
+                        )
+                        auto_create_test_passed = True
+                        break
+                else:  # no rule passes
+                    auto_create_test_result = (
+                        f"{local}@{custom_domain.domain} doesn't pass any rule"
+                    )
+
+                return render_template(
+                    "dashboard/domain_detail/auto-create.html", **locals()
+                )
 
         return redirect(
             url_for(
@@ -483,6 +519,4 @@ def domain_detail_auto_create(custom_domain_id):
             )
         )
 
-    nb_alias = Alias.filter_by(custom_domain_id=custom_domain.id).count()
-
     return render_template("dashboard/domain_detail/auto-create.html", **locals())