mirror of
https://bitbucket.org/jsuto/piler.git
synced 2024-11-08 07:11:59 +01:00
373 lines
9.9 KiB
PHP
373 lines
9.9 KiB
PHP
<?php
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class Piler_Mime_Decode {
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const HEADER_FIELDS = ['from', 'to', 'cc', 'subject', 'date'];
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public static function normalize_message($message) {
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$a = preg_split("/\r?\n/", $message);
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return implode(EOL, $a);
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}
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public static function parseMessage($message, &$result) {
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self::splitMessage($message, $headers, $body);
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$boundary = self::getBoundary($headers);
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// No boundary defined
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if($boundary == '') {
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if($headers['content-type']['type'] == "message/rfc822") {
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self::parseMessage($body, $result);
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}
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else {
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$result[] = [
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'headers' => $headers,
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'body' => $body
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];
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}
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return;
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}
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$parts = self::splitMime($body, $boundary);
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for($i=0; $i<count($parts); $i++) {
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self::splitMessage($parts[$i], $headers, $body);
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$boundary = self::getBoundary($headers);
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if($boundary) {
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self::parseMessage($parts[$i], $result);
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}
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else {
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if(in_array($headers['content-type']['type'], ["text/plain", "text/html"])) {
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$result[] = ['headers' => $headers, 'body' => $body];
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}
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else if($headers['content-type']['type'] == "message/rfc822") {
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self::parseMessage($body, $result);
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}
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}
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}
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}
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public static function splitMime($body, $boundary) {
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$start = 0;
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$res = [];
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// Extract the mime parts excluding the boundary itself
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$p = strpos($body, '--' . $boundary . EOL, $start);
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if($p === false) {
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// no parts found!
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return [];
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}
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// Position after first boundary line
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$start = $p + 3 + strlen($boundary);
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while(($p = strpos($body, '--' . $boundary . EOL, $start)) !== false) {
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$res[] = substr($body, $start, $p-$start);
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$start = $p + 3 + strlen($boundary);
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}
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// No more parts, find end boundary
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$p = strpos($body, '--' . $boundary . '--', $start);
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if($p === false) {
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return [];
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}
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// The remaining part also needs to be parsed:
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$res[] = substr($body, $start, $p - $start);
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return $res;
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}
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public static function splitMessage($message, &$headers, &$body) {
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self::splitMessageRaw($message, $headers, $journal, $body);
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$headers = self::splitHeaders($headers);
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}
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public static function splitMessageRaw($message, &$headers, &$journal, &$body) {
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$headers = [];
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$body = '';
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$message = self::normalize_message($message);
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// Find an empty line between headers and body, otherwise we got a header-only message
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if(strpos($message, EOL . EOL)) {
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list($headers, $body) = explode(EOL . EOL, $message, 2);
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// Check if the header is actually a journal header
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$headers_array = self::splitHeaders($headers);
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if(isset($headers_array['x-ms-journal-report']) && isset($headers_array['content-type']['boundary'])) {
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$boundary = $headers_array['content-type']['boundary'];
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$parts = self::splitMime($body, $boundary);
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if(count($parts) >= 2) {
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self::splitMessageRaw($parts[0], $s, $j, $journal);
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$i = strpos($parts[1], EOL . EOL);
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$msg = substr($parts[1], $i);
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$i = 0;
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while(ctype_space($msg[$i])) { $i++; }
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if($i > 0) { $msg = substr($msg, $i); }
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self::splitMessageRaw($msg, $headers, $j, $body);
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}
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}
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// If the message has a single binary attachment, then drop the body part
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if(isset($headers_array['content-type']['type'])) {
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foreach(['application/', 'image/'] as $type) {
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if(strstr($headers_array['content-type']['type'], $type)) {
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$body = '';
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break;
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}
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}
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}
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}
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else {
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$headers = $message;
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}
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}
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public static function removeJournal(&$message) {
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$has_journal = 0;
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self::splitMessageRaw($message, $headers, $journal, $body);
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if($journal) {
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$has_journal = 1;
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}
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$message = $headers . EOL . EOL . $body;
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return $has_journal;
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}
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public static function splitHeaders($headers) {
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$headers = self::headersToArray($headers);
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// normalize header names
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foreach ($headers as $name => $header) {
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$lower = strtolower($name);
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if($lower == $name) {
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continue;
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}
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unset($headers[$name]);
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if(!isset($headers[$lower])) {
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$headers[$lower] = $header;
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continue;
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}
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if(is_array($headers[$lower])) {
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$headers[$lower][] = $header;
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continue;
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}
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$headers[$lower] = [$headers[$lower], $header];
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}
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// Add some default values, if they are missing
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if(!isset($headers['content-type'])) { $headers['content-type'] = 'text/plain'; }
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// I saw a dumb email (it was a spam, though) having two Date: lines.
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// In this case we take the first date, and discard the rest
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if(isset($headers[self::HEADER_FIELDS[4]]) && is_array($headers[self::HEADER_FIELDS[4]])) {
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$headers[self::HEADER_FIELDS[4]] = $headers[self::HEADER_FIELDS[4]][0];
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}
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for($i=0; $i<count(self::HEADER_FIELDS); $i++) {
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if(!isset($headers[self::HEADER_FIELDS[$i]])) { $headers[self::HEADER_FIELDS[$i]] = ''; }
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// If the mail header features the same field more than once, eg.
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// Date: Wed, 23 Mar 2016 21:26:53 +0100
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// Date: Wed, 23 Mar 2016 21:26:53 +0100
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// then take the first occurance
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$header = $headers[self::HEADER_FIELDS[$i]];
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if(is_array($header)) {
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$header = $header[0];
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}
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if(ENABLE_GB2312_FIX) {
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$header = preg_replace("/gb2312/i", "GBK", $header);
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}
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$headers[self::HEADER_FIELDS[$i]] = iconv_mime_decode($header, ICONV_MIME_DECODE_CONTINUE_ON_ERROR);
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}
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$headers['content-type'] = self::splitContentType($headers['content-type']);
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$headers['content-type']['type'] = strtolower($headers['content-type']['type']);
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return $headers;
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}
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public static function headersToArray($headers = '') {
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$token = '';
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$last_token = '';
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$result = [];
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$headers = explode(EOL, $headers);
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foreach($headers as $h) {
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// Handle cases when there's no whitespace between the header key and value
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// eg. Subject:som
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$h = preg_replace("/^([\S]+):(\S)/", '${1}: ${2}', $h);
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$h = preg_replace("/\s{1,}/", " ", $h);
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$line = preg_split("/\s/", $h);
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// Skip line if it doesn't have a colon (:) and the 1st character is not a whitespace
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if($h && !ctype_space($h[0]) && !strchr($h, ':')) { continue; }
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if($line) {
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if(substr($line[0], -1) == ':') {
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$token = array_shift($line);
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$token = rtrim($token, ':');
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$last_token = $token;
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}
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else {
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$token = '';
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}
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$line_str = implode(" ", $line);
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if(!isset($result[$last_token])) {
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$result[$last_token] = $line_str;
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}
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else {
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if($token) {
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$result[$last_token] .= EOL;
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}
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$result[$last_token] .= ' ' . $line_str;
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}
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}
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}
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foreach($result as $k => $v) {
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if(strchr($v, EOL)) {
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$result[$k] = explode(EOL, $v);
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}
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}
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return $result;
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}
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public static function splitContentType($field = '') {
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$split = [];
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$what = 'type';
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$field = $what . '=' . $field;
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if(!preg_match_all('%([^=\s]+)\s*=\s*("[^"]+"|[^;]+)(;\s*|$)%', $field, $matches)) {
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return $split;
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}
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$split = [];
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foreach ($matches[1] as $key => $name) {
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$name = strtolower($name);
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if($matches[2][$key][0] == '"') {
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$split[$name] = substr($matches[2][$key], 1, -1);
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} else {
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$split[$name] = $matches[2][$key];
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}
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}
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return $split;
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}
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public static function getBoundary($headers = []) {
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if(isset($headers['content-type']['boundary'])) {
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return $headers['content-type']['boundary'];
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}
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return '';
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}
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public static function fixMimeBodyPart($headers = [], $body = '') {
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if(isset($headers['content-transfer-encoding'])) {
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if(strtolower($headers['content-transfer-encoding']) == 'quoted-printable') {
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$body = quoted_printable_decode($body);
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}
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if(strtolower($headers['content-transfer-encoding']) == 'base64') {
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$body = base64_decode($body);
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}
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}
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if(isset($headers['content-type']['charset'])) {
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if(ENABLE_GB2312_FIX && strtolower($headers['content-type']['charset']) == 'gb2312') {
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$headers['content-type']['charset'] = 'GBK';
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}
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$body = iconv($headers['content-type']['charset'], 'utf-8' . '//IGNORE', $body);
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}
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if(strtolower($headers['content-type']['type']) == 'text/plain') {
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$body = self::escape_lt_gt_symbols($body);
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$body = preg_replace("/\n/", "THE_BREAK_HTML_TAG\n", $body);
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$body = EOL . self::printNicely($body);
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}
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return $body;
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}
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public static function escape_lt_gt_symbols($s = '') {
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$s = preg_replace("/</", "<", $s);
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$s = preg_replace("/>/", ">", $s);
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return $s;
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}
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public static function printNicely($s = '') {
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$k = 0;
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$nice = "";
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$x = explode(" ", $s);
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for($i=0; $i<count($x); $i++){
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$nice .= $x[$i] . " ";
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$k += strlen($x[$i]);
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if(strstr($x[$i], EOL)){ $k = 0; }
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if($k > 70){ $nice .= EOL; $k = 0; }
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}
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return $nice;
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}
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}
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