<?php
/*
Plugin Name: Post To Telegram
Description: When you post to your blog post to the telegram channel as well.
Version: 1.0
Author: Ákos Nikházy
License: GPL2
*/
if (!defined('ABSPATH')) {
exit;
}
add_action('admin_menu', 'post_to_telegram_menu');
add_action('add_meta_boxes', 'post_to_telegram_add_metabox');
add_action('save_post', 'post_to_telegram_handle_post');
register_uninstall_hook(__FILE__, 'post_to_telegram_remove_options_on_uninstall');
// Telegram bot token is very important to not store as plain text in the database.
// Anyone knowing the bot token can control the bot with no effort.
// to encrypt the bot token
function encrypt($data, $key) {
$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-256-cbc'));
$encrypted = openssl_encrypt($data, 'aes-256-cbc', $key, 0, $iv);
return base64_encode($encrypted . '{::}' . $iv);
}
// to decrypt the bot token
function decrypt($data, $key) {
list($encrypted_data, $iv) = explode('{::}', base64_decode($data), 2);
return openssl_decrypt($encrypted_data, 'aes-256-cbc', $key, 0, $iv);
}
// Metabox Registration
function post_to_telegram_add_metabox()
{
add_meta_box(
'post_to_telegram_metabox',
'Post to Telegram',
'post_to_telegram_render_metabox',
'post',
'side',
'high'
);
}
// Render the metabox
function post_to_telegram_render_metabox($post)
{
$optionBotTokenVale = get_option('post_to_telegram_bot_token','');
$chatId = get_option('post_to_telegram_chat_id','');
if($optionBotTokenVale == '' || $chatId == '')
{// no token, why give any controls? Tell them to set it up and where
echo 'Setup Bot Token and/or Chat ID in <a href="/wp-admin/options-general.php?page=post-to-telegram-settings">Settings -> Post to Telegram</a>';
return;
}
?>
<label for="post_to_telegram_checkbox">Send to Telegram? <input type="checkbox" id="post_to_telegram_checkbox" name="post_to_telegram_checkbox" value="1">
</label><br><br>
<label>Optional text: <input type="text" name="post_to_telegram_text" placeholder="this will go before the link"></label>
<?php
}
// Here we clean metabox post data
function post_to_telegram_handle_post($post_id)
{
if (isset($_POST['post_to_telegram_checkbox']))
{
$text = '';
if(isset($_POST['post_to_telegram_text']))
{
$text = wp_kses($_POST['post_to_telegram_text'],array());
}
post_to_telegram_send_message($post_id,$text);
}
}
// Send message to telegram
function post_to_telegram_send_message($post_id,$text)
{
$optionBotTokenVale = get_option('post_to_telegram_bot_token','');
$chatId = get_option('post_to_telegram_chat_id','');
if($optionBotTokenVale == '' || $chatId == '')
{// no token or chat id, do not even try
return;
}
$botToken = decrypt($optionBotTokenVale,AUTH_KEY);
$post = get_post($post_id);
$message = trim($text . ' ' . $post->post_title . ' - ' . get_permalink($post_id));
$data = [
'chat_id' => $chatId,
'text' => $message
];
$ch = curl_init('https://api.telegram.org/bot' . $botToken . '/sendMessage');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_exec($ch);
curl_close($ch);
}
// register admin settings menu item
function post_to_telegram_menu() {
add_options_page(
'Post to Telegram',
'Post to Telegram',
'manage_options',
'post-to-telegram-settings',
'post_to_telegram_settings_page'
);
}
// render admin settings
function post_to_telegram_settings_page()
{
if (!current_user_can('manage_options')) return;
if (isset($_POST['submit']))
{ // save changes
// Verify the nonce
if (!isset($_POST['post_to_telegram_nonce']) || !wp_verify_nonce( sanitize_text_field(wp_unslash($_POST['post_to_telegram_nonce'])), 'post_to_telegram_action')) {
// Nonce verification failed
wp_die('Nonce verification failed. Please try again.');
}
if(isset($_POST['post_to_telegram_bot_token']))
$botToken = sanitize_text_field(wp_unslash($_POST['post_to_telegram_bot_token']));
if(isset($_POST['post_to_telegram_chat_id']))
$chatId = sanitize_text_field(wp_unslash($_POST['post_to_telegram_chat_id']));
update_option('post_to_telegram_bot_token', encrypt($botToken,AUTH_KEY));
update_option('post_to_telegram_chat_id', $chatId);
}
$optionBotTokenVale = get_option('post_to_telegram_bot_token','');
$botToken = $optionBotTokenVale;
if($optionBotTokenVale != '')
{
$botToken = decrypt($optionBotTokenVale,AUTH_KEY);
}
$chatId = get_option('post_to_telegram_chat_id','');
/* Hidden nonce field HTML */
$html_escaped = '<div class="wrap JDMwrap">
<h1>Post to Telegram</h1>
<form method="post" action="">
'. wp_nonce_field('post_to_telegram_action', 'post_to_telegram_nonce');
$html_escaped .= '<label for="post_to_telegram_bot_token">Bot Token:</label><br>
<input type="password" id="post_to_telegram_bot_token" name="post_to_telegram_bot_token" value="' . esc_attr($botToken) . '"><br>
<label for="post_to_telegram_chat_id">Chat ID</label><br>
<input type="text" id="post_to_telegram_chat_id" name="post_to_telegram_chat_id" value="' . esc_attr($chatId) . '"><br>';
/* Submit button HTML */
$html_escaped .= '<br><br>
<input type="submit" name="submit" class="button button-primary" value="Save Changes">
</form>';
$html_escaped .= '<hr>
<h2>How to use?</h2>
<p>You need a Telegram channel or group where you want to send links to your posts and a Telegram bot that will do the deed. These are the steps:
<ol>
<li>Create a Channel on Telegram</li>
<li>Get the channel ID by forwarding a post from the channel to the IDBot (@username_to_id_bot). Write down your Channel ID.</li>
<li>Create a new bot with the Bot Father (@BotFather). Follow its instructions. You will recieve the bot token. Write it down. Remember, this is a token that gives anyone knowing it full control over your bot. This plugin saves the token in an encrypted form. Never share it with anyone.</li>
<li>Add your bot as an administrator to the channel. It only needs message rights to work.</li>
<li>Enter the chat id and bot token in the fields above.</li>
<li>When you writing a new post or updateing an existing one, check the checkbox and optionally wirte a text in the metabox. The message with a link to the post will be sent to the channel when you save the post.</li>
</ol>';
$allowed_html = array(
'div' => array(
'class' => array(),
),
'form' => array(
'method' => array(),
'action' => array()
),
'h1' => array(),
'h2' => array(),
'p' => array(),
'ol' => array(),
'li' => array(),
'label' => array(
'for' => array(),
'class'=> array(),
'id' => array(),
),
'input' => array(
'type' => array(),
'name' => array(),
'value' => array(),
'id' => array(),
'class' =>array(),
'checked' => array(),
),
'br' => array(),
'a' => array(
'href' => array(),
'target' => array(),
)
);
echo wp_kses($html_escaped,$allowed_html);
}
// clean up after oursleves (this is especially important so we do not leave behind bot token, not even encrypted)
function post_to_telegram_remove_options_on_uninstall() {
$options_to_remove = array('post_to_telegram_bot_token', 'post_to_telegram_chat_id');
foreach ($options_to_remove as $option) {
if (get_option($option)) {
delete_option($option);
}
}
}
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