234 lines
9.0 KiB
PHP
234 lines
9.0 KiB
PHP
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<?php
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// Create an "app" from the Twitter account you want to post to:
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// https://dev.twitter.com/
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//
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// From your app's Details page, request an Access Token (bottom).
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// Reload periodically until you have it.
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// Paste in your values for these strings:
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class TwitterPostHookCredentials
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{
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public static $consumer_key = '';
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public static $consumer_secret = '';
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public static $access_token = '';
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public static $access_token_secret = '';
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}
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// Test your credentials by executing this file alone from the command line:
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// php -f post_twitter.php
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// Edit this function to customize the formatting of the posted tweets.
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// The $post array is just like the $content['post'] arrays in the templates.
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// You can even change the posted URL by overwriting $url_to_use.
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//
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// The string returned by this function will have a space and URL appended.
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// $max_characters accounts for this, and is the most UTF-8 characters YOU can
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// return from this function.
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//
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// The twitter_summarize($text, $max_characters) function is available. It
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// will trim a string at the nearest word boundary and append an ellipsis to
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// fit within the number of characters if it's too long.
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//
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function tweet_text_before_url_for_post(array $post, $max_characters, &$url_to_use)
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{
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$title = $post['post-title'];
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if (isset($post['link'])) $title = "\xE2\x86\x92 " . $title; // right arrow
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return twitter_summarize($title, $max_characters);
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}
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// ======== You probably don't want to edit anything below this line =========
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class ExtremelyBasicSelfContainedOAuthConsumer
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{
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public $consumer_key;
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public $consumer_secret;
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public $token = '';
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public $token_secret = '';
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public $request_timeout_seconds = 10;
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public static function hmac_sha1($data, $key)
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{
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if (strlen($key) > 64) $key = pack('H40', sha1($key));
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if (strlen($key) < 64) $key = str_pad($key, 64, chr(0));
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$ipad = (substr($key, 0, 64) ^ str_repeat(chr(0x36), 64));
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$opad = (substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64));
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return sha1($opad . pack('H40', sha1($ipad . $data)), true);
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}
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public function signature($request_method, $target_url, $post_params = array())
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{
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if ( ($qs = @parse_url($target_url, PHP_URL_QUERY)) ) {
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parse_str($qs, $get_params);
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$post_params = array_merge($get_params, $post_params);
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}
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if (isset($post_params['oauth_signature'])) unset($post_params['oauth_signature']);
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ksort($post_params);
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if (false !== ($cutpos = strpos($target_url, '?')) ) $target_url = substr($target_url, 0, $cutpos);
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$parts = array($request_method, rawurlencode($target_url));
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$vars = array();
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foreach ($post_params as $name => $val) $vars[] = rawurlencode($name) . '=' . rawurlencode($val);
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$parts[] = rawurlencode(implode('&', $vars));
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$signature_base_string = implode('&', $parts);
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return base64_encode(self::hmac_sha1($signature_base_string, $this->consumer_secret . '&' . ($this->token_secret ? $this->token_secret : '')));
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}
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public function request_parameters($request_method, $target_url, $post_params = array())
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{
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$params = array(
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'oauth_consumer_key' => $this->consumer_key,
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'oauth_signature_method' => 'HMAC-SHA1',
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'oauth_timestamp' => time(),
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'oauth_nonce' => sha1($this->consumer_secret . microtime(true) . $this->token_secret),
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'oauth_version' => '1.0'
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);
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if (strlen($this->token)) $params['oauth_token'] = $this->token;
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$post_params = array_merge($post_params, $params);
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$sig = $this->signature($request_method, $target_url, $post_params);
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$params['oauth_signature'] = $sig;
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return $params;
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}
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public function authorization_header_value($oauth_request_parameters)
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{
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$value = 'OAuth ';
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foreach ($oauth_request_parameters as $key => $val) {
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$value .= $key . '="' . rawurlencode($val) . '", ';
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}
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$value = rtrim($value, ', ');
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return $value;
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}
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public function http_build_query_raw(array $arr)
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{
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$out = array();
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foreach ($arr as $name => $val) $out[] = rawurlencode($name) . '=' . rawurlencode($val);
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return implode('&', $out);
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}
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public function request($method, $endpoint, $params = array())
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{
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$oauth_parameters = $this->request_parameters($method, $endpoint, $params);
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$auth = $this->authorization_header_value($oauth_parameters);
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$curl = curl_init($endpoint);
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curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
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curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, $this->request_timeout_seconds);
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curl_setopt($curl, CURLOPT_TIMEOUT, $this->request_timeout_seconds);
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curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
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curl_setopt($curl, CURLOPT_FAILONERROR, 0);
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curl_setopt($curl, CURLOPT_HTTPHEADER, array('Authorization: ' . $auth, 'Expect:'));
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if ($method == 'POST') {
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curl_setopt($curl, CURLOPT_POST, true);
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curl_setopt($curl, CURLOPT_POSTFIELDS, self::http_build_query_raw($params));
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}
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$data = curl_exec($curl);
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curl_close($curl);
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return $data;
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}
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}
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function twitter_summarize($text, $length, $ellipsis = "\xE2\x80\xA6" /* UTF-8 … */)
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{
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if ($length == 0) return $text;
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if (mb_strlen($text, 'UTF-8') <= $length) return $text;
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$word_delimiter = ' ';
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$word_delimiter_mblen = 1;
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$length -= mb_strlen($ellipsis, 'UTF-8');
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$cut_str = mb_substr($text, 0, $length + $word_delimiter_mblen, 'UTF-8');
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if (mb_substr($cut_str, 0 - $word_delimiter_mblen) != $word_delimiter) {
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$cut_str = mb_substr($cut_str, 0, 0 - $word_delimiter_mblen);
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}
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$split_pos = $cut_str ? mb_strrpos($cut_str, $word_delimiter, 'UTF-8') : false;
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if ($split_pos) {
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return mb_substr($text, 0, $split_pos, 'UTF-8') . $ellipsis;
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} else {
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return $cut_str . $ellipsis;
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}
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}
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function tweet_link_to_post(array $post_array_for_template)
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{
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$oauth = new ExtremelyBasicSelfContainedOAuthConsumer();
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$oauth->consumer_key = TwitterPostHookCredentials::$consumer_key;
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$oauth->consumer_secret = TwitterPostHookCredentials::$consumer_secret;
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$oauth->token = TwitterPostHookCredentials::$access_token;
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$oauth->token_secret = TwitterPostHookCredentials::$access_token_secret;
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$short_url_length = 24; // Big, safe default (at time of writing, Twitter's value is actually 20)
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try {
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$config = json_decode($oauth->request('GET', 'http://api.twitter.com/1/help/configuration.json'), true);
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if (isset($config['short_url_length'])) $short_url_length = intval($config['short_url_length']);
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if ($short_url_length < 16) $short_url_length = 24; // sanity check
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} catch (Exception $e) { }
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$url_to_use = $post_array_for_template['post-absolute-permalink'];
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$tweet_text = tweet_text_before_url_for_post(
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$post_array_for_template,
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140 - ($short_url_length + 1 /* the space before the URL */),
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$url_to_use
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);
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$tweet_text .= ' ' . $url_to_use;
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$response = $oauth->request(
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'POST', 'https://api.twitter.com/1/statuses/update.json',
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array('trim_user' => 'true', 'status' => $tweet_text)
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);
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$post = @json_decode($response, true);
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if ($post && isset($post['id_str']) && isset($post['text'])) {
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error_log("Posted to Twitter: [{$post['text']}]");
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} else {
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error_log("Posting to Twitter failed: $response");
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}
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}
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$command_line_test_mode = isset($_SERVER['argv'][0]) && substr($_SERVER['argv'][0], -16) == 'post_twitter.php';
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if ($command_line_test_mode) {
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$oauth = new ExtremelyBasicSelfContainedOAuthConsumer();
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$oauth->consumer_key = TwitterPostHookCredentials::$consumer_key;
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$oauth->consumer_secret = TwitterPostHookCredentials::$consumer_secret;
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$oauth->token = TwitterPostHookCredentials::$access_token;
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$oauth->token_secret = TwitterPostHookCredentials::$access_token_secret;
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$response = $oauth->request('GET', 'https://api.twitter.com/1/account/verify_credentials.json');
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$user = @json_decode($response, true);
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if ($user && isset($user['error'])) {
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echo "\nTwitter returned an error: {$user['error']}\n\n";
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exit(1);
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} else if ($user && isset($user['name']) && isset($user['screen_name'])) {
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echo "\nSuccessfully authenticated as @{$user['screen_name']} ({$user['name']})\n";
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} else {
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echo "\nGot unrecognized response from Twitter:\n$response\n\n";
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exit(1);
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}
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if (isset($_SERVER['argv'][1]) && $_SERVER['argv'][1] == 'post') {
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tweet_link_to_post(array(
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'post-title' => 'Test post title',
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'post-absolute-permalink' => 'http://twitter.com/',
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));
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echo "\n";
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} else {
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echo "Re-run with argument 'post' to create a test post on Twitter.\n\n";
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}
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} else {
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class Twitter extends Hook
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{
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public function doHook(Post $post)
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{
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tweet_link_to_post($post->array_for_template());
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}
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}
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}
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