/**
* Shortcode.
* Usage: [email-downloads file="http://path/to/file.ext"].
*
* @param array $atts Attributes that passed through shortcode.
* @return string Formatted form.
* ------------------------------------------------------------------------------
*/
function nanodesigns_email_downloads_shortcode($atts)
{
global $maximum_link_duration;
$atts = shortcode_atts(array('file' => ''), $atts);
$file_path = $atts['file'];
//Error storage
$submission_error = array();
if (isset($_POST['download_submit'])) {
$email = $_POST['download_email'];
if (!empty($email)) {
if (is_email($email)) {
$ip_address = nanodesigns_get_the_ip();
//grab the user's IP
$unique_string = $email . $ip_address . $file_path;
//more complex unique string
$hash = hash_hmac('md5', $unique_string, $ip_address);
//IP address is the key
//db storage - for 12 hours only
set_transient($hash, $file_path, $maximum_link_duration * HOUR_IN_SECONDS);
/**
* Making the download link with parameter
* 'download_token' is important.
* @var string
*/
$download_link = esc_url(add_query_arg('download_token', $hash, site_url()));
//email the download link
$success = nanodesigns_email_downloads($email, $download_link);
//store the email into our database
nanodesigns_ed_store_emails($email);
} else {
$submission_error[] = __('Please enter a valid email address', 'email-downloads');
}
} else {
$submission_error[] = __('Email Address cannot be empty', 'email-downloads');
}
}
ob_start();
?>
<hr>
<div class="email-downloads">
<form action="" enctype="multipart/form-data" method="post">
<p><label for="download-email"><?php
_e('Enter your email address to download the file. An email will be sent to your email address with the download link.', 'email-downloads');
?>
</label></p>
<?php
//Show errors, if any
if (!empty($submission_error)) {
foreach ($submission_error as $error) {
echo '<p style="color: red;">' . __('<strong>Error: </strong>', 'email-downloads') . $error . '</p>';
}
}
?>
<p><input type="email" name="download_email" id="download-email" placeholder="type your email address here" value="<?php
echo isset($_POST['download_email']) ? $_POST['download_email'] : '';
?>
" autocomplete="off" size="50"></p>
<button type="submit" name="download_submit"><?php
_e('Send me the File', 'email-downloads');
?>
</button>
</form>
</div>
<?php
return ob_get_clean();
}
/**
* Storing email addresses into our table.
*
* @param string $email The user submitted email address.
* ------------------------------------------------------------------------------
*/
function nanodesigns_store_emails($email)
{
if ($email && is_email($email)) {
if (nano_email_exists($email)) {
//don't duplicate email addresses
return;
} else {
$currenttimestring = strtotime(date('Y-m-d H:i:s', current_time('timestamp')));
$ip_address = nanodesigns_get_the_ip();
$hashed_string = md5($currenttimestring . $ip_address);
update_option("nanoedmail_{$hashed_string}", $email);
}
}
}
