create unsubscribe view to block quickly an alias

app/dashboard/__init__.py

@@ -1 +1 @@
-from .views import index, pricing, setting, custom_alias, billing, alias_log
+from .views import index, pricing, setting, custom_alias, billing, alias_log, unsubscribe

app/dashboard/views/index.py

@@ -68,15 +68,9 @@ def index():
 
             gen_email.enabled = not gen_email.enabled
             if gen_email.enabled:
-                flash(
-                    f"The email forwarding for {gen_email.email} has been enabled",
-                    "success",
-                )
+                flash(f"Alias {gen_email.email} is enabled", "success")
             else:
-                flash(
-                    f"The email forwarding for {gen_email.email} has been disabled",
-                    "warning",
-                )
+                flash(f"Alias {gen_email.email} is disabled", "warning")
             db.session.commit()
 
         elif request.form.get("form-name") == "delete-email":

app/dashboard/views/unsubscribe.py

@@ -0,0 +1,34 @@
+"""
+Allow user to "unsubscribe", aka block an email alias
+"""
+
+from flask import redirect, url_for, flash
+from flask_login import login_required, current_user
+
+from app.dashboard.base import dashboard_bp
+from app.email_utils import notify_admin
+from app.extensions import db
+from app.models import GenEmail
+
+
+@dashboard_bp.route("/unsubscribe/<gen_email_id>", methods=["GET"])
+@login_required
+def unsubscribe(gen_email_id):
+    gen_email = GenEmail.get(gen_email_id)
+    if not gen_email:
+        flash("Incorrect link. Redirect you to the home page", "warning")
+        return redirect(url_for("dashboard.index"))
+
+    if gen_email.user_id != current_user.id:
+        flash(
+            "You don't have access to this page. Redirect you to the home page",
+            "warning",
+        )
+        return redirect(url_for("dashboard.index"))
+
+    gen_email.enabled = False
+    flash(f"Alias {gen_email.email} has been blocked", "success")
+    db.session.commit()
+
+    notify_admin(f"User {current_user.email} has unsubscribed an alias")
+    return redirect(url_for("dashboard.index"))