Add expired explanation page (#145)

snappass/main.py

@@ -184,7 +184,7 @@ def handle_password():
 def preview_password(password_key):
     password_key = url_unquote_plus(password_key)
     if not password_exists(password_key):
-        abort(404)
+        return render_template('expired.html'), 404
 
     return render_template('preview.html')
 
@@ -194,7 +194,7 @@ def show_password(password_key):
     password_key = url_unquote_plus(password_key)
     password = get_password(password_key)
     if not password:
-        abort(404)
+        return render_template('expired.html'), 404
 
     return render_template('password.html', password=password)
 

snappass/templates/expired.html

@@ -0,0 +1,11 @@
+{% extends "base.html" %}
+
+{% block content %}
+<div class="container">
+  <section>
+    <div class="page-header"><h1>Secret not found, used or expired</h1></div>
+    <p class="lead">The requested URL was not found on the server. This could be because this URL never contained a secret, or because it expired or revealed earlier.</p>
+    <p class="lead">If this URL was sent to you by someone, make sure to check your spelling or ask the person who sent it to you to send a new secret.</p>
+  </section>
+</div>
+{% endblock %}