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I have this manually created page:

$user_login = sanitize_text_field( $_GET['user_login'] );

if ( username_exists( $user_login ) ||  email_exists($user_login) ) { ?>
<!--Everything has been validated, proceed ....-->

<!DOCTYPE HTML>
<html lang="en-US">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script type="text/javascript">
        function submit()
        {
            var f = document.getElementById('lostpasswordform');
            f.onclick = function () { };
            document.lostpasswordform.submit();
        }
    </script>
</head>
<body onload="submit()">

    <form name="lostpasswordform" id="lostpasswordform" action="<?php echo esc_url( site_url( 'wp-login.php?action=lostpassword', 'login_post' ) ); ?>" method="post">

        <input type="hidden" name="user_login" id="user_login" class="input" value="<?php echo ($user_login); ?>" />

    <?php do_action('lost_password'); ?>

    </form>

</body>
</html>

<?php
    echo "SUCCESS";
    exit();
} else {
    echo "Entered Username or Email was incorrect, please try again!";
}

... everything seems right but it doesn't work when called from an app, but if I manually visit domain.com/forgot-password?user_login=username it does send the reset pass email fine.

share|improve this question
    
by app do you mean plugin –  amit Aug 1 '12 at 12:19
    
no, app - android –  Nimbuz Aug 1 '12 at 12:51
    
doesn't work what happens? –  peteroak Aug 3 '12 at 8:06

2 Answers 2

up vote 5 down vote accepted
+100

So if you want to send that the reset password link and you have access to the code base you can use the following snippet and you can modify it further, actually that code is slightly modified version of wp-login.php

/**
 * Handles sending password retrieval email to user.
 *
 * @uses $wpdb WordPress Database object
 * @param string $user_login User Login or Email
 * @return bool true on success false on error
 */
function retrieve_password($user_login) {
    global $wpdb, $current_site;

    if ( empty( $user_login) ) {
        return false;
    } else if ( strpos( $user_login, '@' ) ) {
        $user_data = get_user_by( 'email', trim( $user_login ) );
        if ( empty( $user_data ) )
           return false;
    } else {
        $login = trim($user_login);
        $user_data = get_user_by('login', $login);
    }

    do_action('lostpassword_post');


    if ( !$user_data ) return false;

    // redefining user_login ensures we return the right case in the email
    $user_login = $user_data->user_login;
    $user_email = $user_data->user_email;

    do_action('retreive_password', $user_login);  // Misspelled and deprecated
    do_action('retrieve_password', $user_login);

    $allow = apply_filters('allow_password_reset', true, $user_data->ID);

    if ( ! $allow )
        return false;
    else if ( is_wp_error($allow) )
        return false;

    $key = $wpdb->get_var($wpdb->prepare("SELECT user_activation_key FROM $wpdb->users WHERE user_login = %s", $user_login));
    if ( empty($key) ) {
        // Generate something random for a key...
        $key = wp_generate_password(20, false);
        do_action('retrieve_password_key', $user_login, $key);
        // Now insert the new md5 key into the db
        $wpdb->update($wpdb->users, array('user_activation_key' => $key), array('user_login' => $user_login));
    }
    $message = __('Someone requested that the password be reset for the following account:') . "\r\n\r\n";
    $message .= network_home_url( '/' ) . "\r\n\r\n";
    $message .= sprintf(__('Username: %s'), $user_login) . "\r\n\r\n";
    $message .= __('If this was a mistake, just ignore this email and nothing will happen.') . "\r\n\r\n";
    $message .= __('To reset your password, visit the following address:') . "\r\n\r\n";
    $message .= '<' . network_site_url("wp-login.php?action=rp&key=$key&login=" . rawurlencode($user_login), 'login') . ">\r\n";

    if ( is_multisite() )
        $blogname = $GLOBALS['current_site']->site_name;
    else
        // The blogname option is escaped with esc_html on the way into the database in sanitize_option
        // we want to reverse this for the plain text arena of emails.
        $blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);

    $title = sprintf( __('[%s] Password Reset'), $blogname );

    $title = apply_filters('retrieve_password_title', $title);
    $message = apply_filters('retrieve_password_message', $message, $key);

    if ( $message && !wp_mail($user_email, $title, $message) )
        wp_die( __('The e-mail could not be sent.') . "<br />\n" . __('Possible reason: your host may have disabled the mail() function...') );

    return true;
}

$user_login = sanitize_text_field( $_GET['user_login'] );

if (retrieve_password($user_login)) {
    echo "SUCCESS";
} else {
    echo "ERROR";
}
share|improve this answer
    
IT WORKS! THANKS HEAPS! –  Nimbuz Aug 3 '12 at 23:25
    
This isn't working for me exactly right. I've entered it into a custom plugin and put it on my site but it's causing an issue where when I install the plugin and then click 'Logout' it won't log me out of the site. Any ideas why? –  MxmastaMills Oct 11 '13 at 8:04

Previous answer didn't worked for me (says that code is invalid, on wp login page), probably because answer is 1,5 yr old, and something is changed in WP code, so I have updated this code a bit (also from wp-login.php), here it is:

function retrieve_password($user_login){
    global $wpdb, $wp_hasher;

    $user_login = sanitize_text_field($username);

    if ( empty( $user_login) ) {
        return false;
    } else if ( strpos( $user_login, '@' ) ) {
        $user_data = get_user_by( 'email', trim( $user_login ) );
        if ( empty( $user_data ) )
           return false;
    } else {
        $login = trim($user_login);
        $user_data = get_user_by('login', $login);
    }

    do_action('lostpassword_post');


    if ( !$user_data ) return false;

    // redefining user_login ensures we return the right case in the email
    $user_login = $user_data->user_login;
    $user_email = $user_data->user_email;

    do_action('retreive_password', $user_login);  // Misspelled and deprecated
    do_action('retrieve_password', $user_login);

    $allow = apply_filters('allow_password_reset', true, $user_data->ID);

    if ( ! $allow )
        return false;
    else if ( is_wp_error($allow) )
        return false;

    $key = wp_generate_password( 20, false );
    do_action( 'retrieve_password_key', $user_login, $key );

    if ( empty( $wp_hasher ) ) {
        require_once ABSPATH . 'wp-includes/class-phpass.php';
        $wp_hasher = new PasswordHash( 8, true );
    }
    $hashed = $wp_hasher->HashPassword( $key );
    $wpdb->update( $wpdb->users, array( 'user_activation_key' => $hashed ), array( 'user_login' => $user_login ) );

    $message = __('Someone requested that the password be reset for the following account:') . "\r\n\r\n";
    $message .= network_home_url( '/' ) . "\r\n\r\n";
    $message .= sprintf(__('Username: %s'), $user_login) . "\r\n\r\n";
    $message .= __('If this was a mistake, just ignore this email and nothing will happen.') . "\r\n\r\n";
    $message .= __('To reset your password, visit the following address:') . "\r\n\r\n";
    $message .= '<' . network_site_url("wp-login.php?action=rp&key=$key&login=" . rawurlencode($user_login), 'login') . ">\r\n";

    if ( is_multisite() )
        $blogname = $GLOBALS['current_site']->site_name;
    else
        $blogname = wp_specialchars_decode(get_option('blogname'), ENT_QUOTES);

    $title = sprintf( __('[%s] Password Reset'), $blogname );

    $title = apply_filters('retrieve_password_title', $title);
    $message = apply_filters('retrieve_password_message', $message, $key);

    if ( $message && !wp_mail($user_email, $title, $message) )
        wp_die( __('The e-mail could not be sent.') . "<br />\n" . __('Possible reason: your host may have disabled the mail() function...') );

    echo '<p>Link for password reset has been emailed to you. Please check your email.</p>';;
}
share|improve this answer
    
This worked out for me. The accepted answer for 3.8.1 did not worked and ended in expired key. Specifically, in $key processing and updating user_activation_key. –  Rolice Mar 27 at 21:27
    
Working with 3.9.1 ! –  Warface Jun 16 at 15:25

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