Joomla 1.5 password check - php

Question

I've inherited a joomla 1.5 site that has a reset password component that isn't functioning optimally. ATM I'm able to have password resets sent to the user inputted email, but the component is missing a function that checks against existing users to see if the email is valid. I'm rather new to PHP, so I'm not 100% sure how to introduce an additional if statement.
Here's how's it looking so far:
public function submitemail() {
$db = JFactory::getDBO() ;
$requestedEmail = JRequest::getVar('emailaddr' , '') ;
$db->setQuery('select id , username, name, email from #__users where block = 0 and email = "'.$requestedEmail.'"') ;
if( $user = $db->loadObject() ) {
// Make sure the user isn't a Super Admin.
$juser = JFactory::getUser($user->id) ;
//joomla 1.6 and 1.5 check
if ($juser->authorize('core.admin') || $juser->usertype == 'Super Administrator') {
$this->setRedirect( 'index.php?option=com_resetpassword' , 'Email is not valid' ) ;
}
else {
$result = $this->sendPasswordResetEmail( $user ) ;
$this->setRedirect( 'index.php?option=com_resetpassword&layout=success' //, 'Please check your email and follow the instructions to reset your password '
) ;
}
}
else {
$this->setRedirect( 'index.php?option=com_resetpassword' );
}
}
And I happened across a related post where I found this snippet. How would I go about checking against email addresses that are currently in my database against the user inputted email for the reset?
function validate()
{ jimport('joomla.mail.helper');
$valid = true;
if ($this->_data->email && !JMailHelper::isEmailAddress($this->_data->email))
{
$this->_app->enqueueMessage(JText::_('Invalid Email Address'),'error');
$valid = false;
}
return $valid;
}

Answer 1

That is actually exactly what it is doing already. The top loads the row for the user based on the email address that is submitted:
$requestedEmail = JRequest::getVar('emailaddr' , '') ;
$db->setQuery('select id , username, name, email from #__users where block = 0 and email = "'.$requestedEmail.'"') ;
if( $user = $db->loadObject() ) {
...
All you likely need to do is add a message for when this fails to the else statement at the bottom:
else {
$this->_app->enqueueMessage(JText::_('Invalid Email Address'),'error');
$this->setRedirect( 'index.php?option=com_resetpassword' );
}
If $this->_app isn't set, you should be able to get that by using this instead:
JFactory::getApplication()->enqueueMessage(JText::_('Invalid Email Address'),'error');