create custom domain trash page

app/dashboard/templates/dashboard/domain_detail/base.html

@@ -15,6 +15,11 @@
            class="list-group-item list-group-item-action {{ 'active' if domain_detail_page == 'dns' }}">
           <span class="icon mr-3"><i class="fe fe-cloud"></i></span>DNS
         </a>
+
+        <a href="{{ url_for('dashboard.domain_detail_trash', custom_domain_id=custom_domain.id) }}"
+           class="list-group-item list-group-item-action {{ 'active' if domain_detail_page == 'trash' }}">
+          <span class="icon mr-3"><i class="fe fe-trash"></i></span>Deleted Alias
+        </a>
       </div>
     </div>
 

app/dashboard/templates/dashboard/domain_detail/trash.html

@@ -0,0 +1,50 @@
+{% extends 'dashboard/domain_detail/base.html' %}
+
+{% set domain_detail_page = "trash" %}
+
+{% block title %}
+  {{ custom_domain.domain }} deleted aliases
+{% endblock %}
+
+{% block domain_detail_content %}
+  <h1 class="h3"> {{ custom_domain.domain }} deleted alias (aka Trash)
+    <a class="ml-3 text-info" style="font-size: 12px" data-toggle="collapse" href="#howtouse" role="button"
+       aria-expanded="false" aria-controls="collapseExample">
+      How to use <i class="fe fe-chevrons-down"></i>
+    </a>
+  </h1>
+
+  <div class="alert alert-primary collapse" id="howtouse" role="alert">
+    On this page you can view all aliases that have been deleted and belong to the domain
+    <b>{{ custom_domain.domain }}</b>. <br>
+    When an alias is in the trash, it cannot be re-created, either via the alias creation page or on-the-fly with the
+    domain catch-all option.
+  </div>
+
+  {% if domain_deleted_aliases | length > 0 %}
+    <form method="post">
+      <input type="hidden" name="form-name" value="empty-all">
+      <button class="btn btn-outline-danger">Empty Trash</button>
+      <div class="small-text">
+        Remove all deleted aliases from the trash, allowing them to be re-created.
+        That operation is irreversible.
+      </div>
+    </form>
+  {% else %}
+    There's no deleted alias recorded for this domain.
+  {% endif %}
+
+
+  {% for deleted_alias in domain_deleted_aliases %}
+    <hr>
+    <b>{{ deleted_alias.email }}</b> -
+    deleted {{ deleted_alias.created_at | dt }}
+    <form method="post">
+      <input type="hidden" name="form-name" value="remove-single">
+      <input type="hidden" name="deleted-alias-id" value="{{ deleted_alias.id }}">
+      <button class="btn btn-sm btn-outline-warning">Remove from trash</button>
+    </form>
+  {% endfor %}
+
+
+{% endblock %}

app/dashboard/views/domain_detail.py

@@ -10,7 +10,7 @@ from app.dns_utils import (
     get_cname_record,
 )
 from app.extensions import db
-from app.models import CustomDomain, Alias
+from app.models import CustomDomain, Alias, DomainDeletedAlias
 
 
 @dashboard_bp.route("/domains/<int:custom_domain_id>/dns", methods=["GET", "POST"])
@@ -171,3 +171,57 @@ def domain_detail(custom_domain_id):
     nb_alias = Alias.filter_by(custom_domain_id=custom_domain.id).count()
 
     return render_template("dashboard/domain_detail/info.html", **locals())
+
+
+@dashboard_bp.route("/domains/<int:custom_domain_id>/trash", methods=["GET", "POST"])
+@login_required
+def domain_detail_trash(custom_domain_id):
+    custom_domain = CustomDomain.get(custom_domain_id)
+    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"))
+
+    if request.method == "POST":
+        if request.form.get("form-name") == "empty-all":
+            DomainDeletedAlias.filter_by(domain_id=custom_domain.id).delete()
+            db.session.commit()
+
+            flash("All deleted aliases can now be re-created", "success")
+            return redirect(
+                url_for(
+                    "dashboard.domain_detail_trash", custom_domain_id=custom_domain.id
+                )
+            )
+        elif request.form.get("form-name") == "remove-single":
+            deleted_alias_id = request.form.get("deleted-alias-id")
+            deleted_alias = DomainDeletedAlias.get(deleted_alias_id)
+            if not deleted_alias or deleted_alias.domain_id != custom_domain.id:
+                flash("Unknown error, refresh the page", "warning")
+                return redirect(
+                    url_for(
+                        "dashboard.domain_detail_trash",
+                        custom_domain_id=custom_domain.id,
+                    )
+                )
+
+            DomainDeletedAlias.delete(deleted_alias.id)
+            db.session.commit()
+            flash(
+                f"{deleted_alias.email} can now be re-created", "success",
+            )
+
+            return redirect(
+                url_for(
+                    "dashboard.domain_detail_trash", custom_domain_id=custom_domain.id
+                )
+            )
+
+    domain_deleted_aliases = DomainDeletedAlias.filter_by(
+        domain_id=custom_domain.id
+    ).all()
+
+    return render_template(
+        "dashboard/domain_detail/trash.html",
+        domain_deleted_aliases=domain_deleted_aliases,
+        custom_domain=custom_domain,
+    )