Validate email address

vedia.rb

@@ -136,6 +136,13 @@ get '/reset' do
 end
 
 post '/reset' do
+  @errors = []
+  unless params[:email] =~ URI::MailTo::EMAIL_REGEXP
+    @errors << OpenStruct.new(:attribute => :email, :type => :invalid)
+  end
+  if not @errors.empty?
+    erb :reset
+  else
     @user = User.find_by(email: params[:email])
     if @user
       @reset = SecureRandom.uuid
@@ -150,6 +157,7 @@ post '/reset' do
     end
     erb :reset_sent
   end
+end
 
 get '/reset/:uuid' do
   @user = nil

views/reset.erb

@@ -1,5 +1,13 @@
 <h1 class="mb-5"><%= _("Reset password") %></h1>
 
+<% if @errors %>
+<% @errors.each do |error| %>
+  <% if error.attribute == :email and error.type == :invalid %>
+    <p class="alert alert-warning mb-4"><%= _("Enter an email address.") %></p>
+  <% end %>
+<% end %>
+<% end %>
+
 <form action="/reset" method="post">
   <div class="mb-3">
     <label for="email" class="form-label"><%= _("Email") %></label>