在使用类似电商里面分享图片的时候会有这么一个需求：将网页转成图片，网上都是用html2canvas实现的，但是在图片和网页不是同一个域名的情况下会出现图片渲染不出来的情况。插件作者提供了一个proxy，但是没有详细说明怎么使用，网上搜索也无果，最后从GitHub中找打一个实现，原理是将图片从远程服务器上下载到自己的服务器，再返回。git地址：https://github.com/brcontainer/html2canvas-php-proxy
- html部分
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="https://cdn.bootcss.com/html2canvas/0.5.0-beta4/html2canvas.js"></script>
<script src="https://cdn.bootcss.com/superagent/4.1.0-beta.1/superagent.min.js"></script>
<style>
* {
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<div id="capture" style="background: #f5da55;max-width:100vw;">
<h4 style="color: #000; ">Hello world!</h4>
<img src="https://s2.ax1x.com/2019/11/20/MW70tx.jpg" width="30%" alt="">
</div>
<img id='im' src="" alt="">
<script>
//https://github.com/brcontainer/html2canvas-php-proxy
html2canvas(document.querySelector("#capture"),
{
scale: window.devicePixelRatio * 2, // 默认值是window.devicePixelRatio
"logging": true, //Enable log (use Web Console for get Errors and Warnings)
"proxy": "proxy2.php",
"onrendered": function (canvas) {
var img = new Image();
img.onload = function () {
img.onload = null;
document.body.appendChild(img);
};
img.onerror = function () {
img.onerror = null;
if (window.console.log) {
window.console.log("Not loaded image from canvas.toDataURL");
} else {
alert("Not loaded image from canvas.toDataURL");
}
};
img.src = canvas.toDataURL("image/png");
}
});
</script>
</body>
</html>
- php部分(这个文件直接使用git中的内容，或者可以自己定义一些内容）
<?php
/*
* html2canvas-php-proxy 1.1.2
*
* Copyright (c) 2018 Guilherme Nascimento (brcontainer@yahoo.com.br)
*
* Released under the MIT license
*/
// Turn off errors because the script already own uses "error_get_last"
ini_set('display_errors', 'Off');
// Setup
define('H2CP_PATH', 'cache'); // Relative folder where the images are saved
define('H2CP_PERMISSION', 0666); // use 644 or 666 for remove execution for prevent sploits
define('H2CP_CACHE', 60 * 5 * 1000); // Limit access-control and cache, define 0/false/null/-1 to prevent cache
define('H2CP_TIMEOUT', 20); // Timeout from load Socket
define('H2CP_MAX_LOOP', 10); // Configure loop limit for redirects (location header)
define('H2CP_DATAURI', false); // Enable use of "data URI scheme"
define('H2CP_PREFER_CURL', true); // Enable curl if avaliable or disable
define('H2CP_SECPREFIX', 'h2cp_'); // Prefix temp filename
define('H2CP_ALLOWED_DOMAINS', '*'); // * allow all domains, *.site.com for sub-domains, or fixed domains use `define('H2CP_ALLOWED_DOMAINS', 'site.com,www.site.com' )
define('H2CP_ALLOWED_PORTS', '80,443'); // Allowed ports
define('H2CP_ALTERNATIVE', 'console.log'); // callback alternative
/*
* Set false for disable SSL check
* Set true for enable SSL check, require config `curl.cainfo=/path/to/cacert.pem` in php.ini
* Set path (string) if need config CAINFO manually like this define('H2CP_SSL_VERIFY_PEER', '/path/to/cacert.pem');
*/
define('H2CP_SSL_VERIFY_PEER', false);
// Constants (don't change)
define('H2CP_EOL', chr(10));
define('H2CP_WOL', chr(13));
define('H2CP_GMDATECACHE', gmdate('D, d M Y H:i:s'));
define('H2CP_INIT_EXEC', time());
define('H2CP_JSONP', empty($_GET['callback']) ? false : $_GET['callback']);
/*
If execution has reached the time limit prevents page goes blank (off errors)
or generate an error in PHP, which does not work with the DEBUG (from html2canvas.js)
*/
$maxExec = (int) ini_get('max_execution_time');
define('H2CP_MAX_EXEC', $maxExec < 1 ? 0 : ($maxExec - 5));//reduces 5 seconds to ensure the execution of the DEBUG
$http_port = 0;
$tmp = null;//tmp var usage
$response = array();
/**
* For show ASCII documents with "data uri scheme"
* @param string $s to encode
* @return string always return string
*/
function asciiToInline($str)
{
static $translate;
if ($translate === null) {
$translate = array(
H2CP_EOL => '%0A',
H2CP_WOL => '%0D',
' ' => '%20',
'"' => '%22',
'#' => '%23',
'&' => '%26',
'\/' => '%2F',
'\\' => '%5C',
':' => '%3A',
'?' => '%3F',
chr(0) => '%00',
chr(8) => '',
chr(9) => '%09'
);
}
return strtr($str, $translate);
}
/**
* Detect SSL stream transport
* @return boolean returns false if have an problem, returns true if ok
*/
function supportSSL()
{
static $supported;
if ($supported !== null) {
return $supported;
}
return $supported = in_array('ssl', stream_get_transports());
}
/**
* Remove old files defined by H2CP_CACHE
* @return void return always void
*/
function removeOldFiles()
{
$p = H2CP_PATH . '/';
if (
(H2CP_MAX_EXEC === 0 || (time() - H2CP_INIT_EXEC) < H2CP_MAX_EXEC) && //prevents this function locks the process that was completed
(file_exists($p) || is_dir($p))
) {
$h = opendir($p);
if (false !== $h) {
while (false !== ($f = readdir($h))) {
if (
is_file($p . $f) &&
strpos($f, H2CP_SECPREFIX) !== false &&
(H2CP_INIT_EXEC - filectime($p . $f)) > (H2CP_CACHE * 2)
) {
unlink($p . $f);
}
}
}
}
}
/**
* Detect if content-type is valid and get charset if available
* @param string $content content-type
* @return array always return array
*/
function checkContentType($content)
{
$content = strtolower($content);
$encode = null;
if (preg_match('#[;](\\s+)?charset[=]#', $content) === 1) {
$encode = preg_split('#[;](\\s+)?charset[=]#', $content);
$encode = empty($encode[1]) ? null : trim($encode[1]);
}
$mime = trim(
preg_replace('#[;](.*)?$#', '',
str_replace('content-type:', '',
str_replace('/x-', '/', $content)
)
)
);
if (in_array($mime, array(
'image/bmp', 'image/windows-bmp', 'image/ms-bmp',
'image/jpeg', 'image/jpg', 'image/png', 'image/gif',
'text/html', 'application/xhtml', 'application/xhtml+xml',
'image/svg+xml', //SVG image
'image/svg-xml' //Old servers (bug)
)) === false) {
return array('error' => $mime . ' mimetype is invalid');
}
return array(
'mime' => $mime, 'encode' => $encode
);
}
/**
* enconde string in "json" (only strings), json_encode (native in php) don't support for php4
* @param string $str to encode
* @return string always return string
*/
function JsonEncodeString($str, $onlyEncode=false)
{
static $translate;
if ($translate === null) {
$translate = array(
0 => '\\0',
8 => '\\b',
9 => '\\t',
10 => '\\n',
12 => '\\f',
13 => '\\r',
34 => '\\"',
47 => '\\/',
92 => '\\\\'
);
}
$tmp = '';
$enc = '';
$j = strlen($str);
for ($i = 0; $i < $j; ++$i) {
$tmp = substr($str, $i, 1);
$c = ord($tmp);
if ($c > 126) {
$d = '000' . dechex($c);
$tmp = '\\u' . substr($d, strlen($d) - 4);
} else {
if (isset($translate[$c])) {
$tmp = $translate[$c];
} elseif (($c > 31) === false) {
$d = '000' . dechex($c);
$tmp = '\\u' . substr($d, strlen($d) - 4);
}
}
$enc .= $tmp;
}
if ($onlyEncode) {
return $enc;
} else {
return '"' . $enc . '"';
}
}
/**
* set headers in document
* @param boolean $nocache If false set cache (if H2CP_CACHE > 0), If true set no-cache in document
* @return void return always void
*/
function setHeaders($nocache)
{
if ($nocache === false && is_int(H2CP_CACHE) && H2CP_CACHE > 0) {
//save to browser cache
header('Last-Modified: ' . H2CP_GMDATECACHE . ' GMT');
header('Cache-Control: max-age=' . (H2CP_CACHE - 1));
header('Pragma: max-age=' . (H2CP_CACHE - 1));
header('Expires: ' . gmdate('D, d M Y H:i:s', H2CP_INIT_EXEC + H2CP_CACHE - 1));
header('Access-Control-Max-Age:' . H2CP_CACHE);
} else {
//no-cache
header('Pragma: no-cache');
header('Cache-Control: no-cache');
header('Expires: '. H2CP_GMDATECACHE .' GMT');
}
//set access-control
header('Access-Control-Allow-Origin: *');
header('Access-Control-Request-Method: *');
header('Access-Control-Allow-Methods: OPTIONS, GET');
header('Access-Control-Allow-Headers: *');
}
/**
* Converte relative-url to absolute-url
* @param string $url set base url
* @param string $relative set relative url
* @return string return always string, if have an error, return blank string (scheme invalid)
*/
function relativeToAbsolute($url, $relative)
{
if (strpos($relative, '//') === 0) {//http link //site.com/test
return 'http:' . $relative;
}
if (preg_match('#^[a-z0-9]+[:]#i', $relative) !== 0) {
$pu = parse_url($relative);
if (preg_match('#^https?$#i', $pu['scheme']) === 0) {
return '';
}
$relative = '';
if (isset($pu['path'])) {
$relative .= $pu['path'];
}
if (isset($pu['query'])) {
$relative .= '?' . $pu['query'];
}
if (isset($pu['fragment'])) {
$relative .= '#' . $pu['fragment'];
}
return relativeToAbsolute($pu['scheme'] . '://' . $pu['host'], $relative);
}
if (preg_match('/^[?#]/', $relative) !== 0) {
return $url . $relative;
}
$pu = parse_url($url);
$pu['path'] = isset($pu['path']) ? preg_replace('#/[^/]*$#', '', $pu['path']) : '';
$pm = parse_url('http://1/' . $relative);
$pm['path'] = isset($pm['path']) ? $pm['path'] : '';
$isPath = $pm['path'] !== '' && strpos(strrev($pm['path']), '/') === 0;
if (strpos($relative, '/') === 0) {
$pu['path'] = '';
}
$b = $pu['path'] . '/' . $pm['path'];
$b = str_replace('\\', '/', $b);//Confuso ???
$ab = explode('/', $b);
$j = count($ab);
$ab = array_filter($ab, 'strlen');
$nw = array();
for ($i = 0; $i < $j; ++$i) {
if (isset($ab[$i]) === false || $ab[$i] === '.') {
continue;
}
if ($ab[$i] === '..') {
array_pop($nw);
} else {
$nw[] = $ab[$i];
}
}
$relative = $pu['scheme'] . '://' . $pu['host'] . '/' . implode('/', $nw) . ($isPath ? '/' : '');
if (isset($pm['query'])) {
$relative .= '?' . $pm['query'];
}
if (isset($pm['fragment'])) {
$relative .= '#' . $pm['fragment'];
}
$nw = null;
$ab = null;
$pm = null;
$pu = null;
return $relative;
}
/**
* validate url
* @param string $url set base url
* @return boolean return always boolean
*/
function isHttpUrl($url)
{
return preg_match('#^https?[:]//.#i', $url) === 1;
}
/**
* check if url is allowed
* @param string $url set base url
* @return boolean return always boolean
*/
function isAllowedUrl($url, &$message) {
$uri = parse_url($url);
$domains = array_map('trim', explode(',', H2CP_ALLOWED_DOMAINS));
if (in_array('*', $domains) === false) {
$ok = false;
foreach ($domains as $domain) {
if ($domain === $uri['host']) {
$ok = true;
break;
} elseif (strpos($domain, '*') !== false) {
$domain = strtr($domain, array(
'*' => '\\w+',
'.' => '\\.'
));
if (preg_match('#^' . $domain . '$#i', $uri['host']) === 1) {
$ok = true;
break;
}
}
}
if ($ok === false) {
$message = '"' . $uri['host'] . '" domain is not allowed';
return false;
}
}
if (empty($uri['port'])) {
$port = strcasecmp('https', $uri['scheme']) === 0 ? 443 : 80;
} else {
$port = $uri['port'];
}
$ports = array_map('trim', explode(',', H2CP_ALLOWED_PORTS));
if (in_array($port, $ports)) {
return true;
}
$message = '"' . $port . '" port is not allowed';
return false;
}
/**
* create folder for images download
* @return boolean return always boolean
*/
function createFolder()
{
if (file_exists(H2CP_PATH) === false || is_dir(H2CP_PATH) === false) {
return mkdir(H2CP_PATH, H2CP_PERMISSION);
}
return true;
}
/**
* create temp file which will receive the download
* @param string $basename set url
* @param boolean $isEncode If true uses the "first" temporary name
* @return boolean|array If you can not create file return false, If create file return array
*/
function createTmpFile($basename, $isEncode)
{
$folder = preg_replace('#/$#', '', H2CP_PATH) . '/';
if ($isEncode === false) {
$basename = H2CP_SECPREFIX . strlen($basename) . '.' . sha1($basename);
}
$tmpMime = '.' . mt_rand(0, 1000) . '_';
$tmpMime .= $isEncode ? time() : H2CP_INIT_EXEC;
if (file_exists($folder . $basename . $tmpMime)) {
return createTmpFile($basename, true);
}
$source = fopen($folder . $basename . $tmpMime, 'wb');
if ($source !== false) {
return array(
'location' => $folder . $basename . $tmpMime,
'source' => $source
);
}
return false;
}
/**
* download http request using curl extension (If found HTTP 3xx)
* @param string $url url requested
* @param resource $toSource save downloaded url contents
* @return array retuns array
*/
function curlDownloadSource($url, $toSource)
{
$uri = parse_url($url);
//Reformat url
$currentUrl = (empty($uri['scheme']) ? 'http': $uri['scheme']) . '://';
$currentUrl .= empty($uri['host']) ? '': $uri['host'];
if (isset($uri['port'])) {
$currentUrl .= ':' . $uri['port'];
}
$currentUrl .= empty($uri['path']) ? '/': $uri['path'];
$currentUrl .= empty($uri['query']) ? '': ('?' . $uri['query']);
$ch = curl_init();
if (H2CP_SSL_VERIFY_PEER) {
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
} elseif (is_string(H2CP_SSL_VERIFY_PEER)) {
if (is_file(H2CP_SSL_VERIFY_PEER)) {
curl_close($ch);
return array('error' => 'Not found certificate: ' . H2CP_SSL_VERIFY_PEER);
}
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($ch, CURLOPT_CAINFO, H2CP_SSL_VERIFY_PEER);
} else {
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
}
curl_setopt($ch, CURLOPT_TIMEOUT, H2CP_TIMEOUT);
curl_setopt($ch, CURLOPT_URL, $currentUrl);
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_MAXREDIRS, H2CP_MAX_LOOP);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
if (isset($uri['user'])) {
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl_setopt($ch, CURLOPT_USERPWD, $uri['user'] . ':' . (isset($uri['pass']) ? $uri['pass'] : ''));
}
$headers = array();
if (false === empty($_SERVER['HTTP_ACCEPT'])) {
$headers[] = 'Accept: ' . $_SERVER['HTTP_ACCEPT'];
}
if (false === empty($_SERVER['HTTP_USER_AGENT'])) {
$headers[] = 'User-Agent: ' . $_SERVER['HTTP_USER_AGENT'];
}
if (false === empty($_SERVER['HTTP_REFERER'])) {
$headers[] = 'Referer: ' . $_SERVER['HTTP_REFERER'];
}
$headers[] = 'Host: ' . $uri['host'];
$headers[] = 'Connection: close';
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$data = curl_exec($ch);
$curl_err = curl_errno($ch);
$result = null;
if ($curl_err !== 0) {
$result = array('error' => 'CURL failed: ' . $curl_err);
} else {
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
if ($httpCode != 200) {
$result = array('error' => 'Request returned HTTP_' . $httpCode);
}
if ($result === null) {
$result = checkContentType($contentType);
if (empty($result['error'])) {
fwrite($toSource, $data);
}
}
}
curl_close($ch);
return $result;
}
/**
* download http request recursive (If found HTTP 3xx)
* @param string $url url requested
* @param resource $toSource save downloaded url contents
* @return array retuns array
*/
function downloadSource($url, $toSource, $caller)
{
$errno = 0;
$errstr = '';
++$caller;
if ($caller > H2CP_MAX_LOOP) {
return array('error' => 'Limit of ' . H2CP_MAX_LOOP . ' redirects was exceeded, maybe there is a problem: ' . $url);
}
$uri = parse_url($url);
$secure = strcasecmp($uri['scheme'], 'https') === 0;
if ($secure) {
if (supportSSL() === false) {
return array('error' => 'No SSL stream support detected');
}
}
$port = empty($uri['port']) ? ($secure ? 443 : 80) : ((int) $uri['port']);
$host = ($secure ? 'ssl://' : '') . $uri['host'];
$fp = fsockopen($host, $port, $errno, $errstr, H2CP_TIMEOUT);
if ($fp === false) {
return array('error' => 'SOCKET: ' . $errstr . '(' . $errno . ') - ' . $host . ':' . $port);
} else {
fwrite(
$fp, 'GET ' . (
empty($uri['path']) ? '/' : $uri['path']
) . (
empty($uri['query']) ? '' : ('?' . $uri['query'])
) . ' HTTP/1.0' . H2CP_WOL . H2CP_EOL
);
if (isset($uri['user'])) {
$auth = base64_encode($uri['user'] . ':' . (isset($uri['pass']) ? $uri['pass'] : ''));
fwrite($fp, 'Authorization: Basic ' . $auth . H2CP_WOL . H2CP_EOL);
}
if (false === empty($_SERVER['HTTP_ACCEPT'])) {
fwrite($fp, 'Accept: ' . $_SERVER['HTTP_ACCEPT'] . H2CP_WOL . H2CP_EOL);
}
if (false === empty($_SERVER['HTTP_USER_AGENT'])) {
fwrite($fp, 'User-Agent: ' . $_SERVER['HTTP_USER_AGENT'] . H2CP_WOL . H2CP_EOL);
}
if (false === empty($_SERVER['HTTP_REFERER'])) {
fwrite($fp, 'Referer: ' . $_SERVER['HTTP_REFERER'] . H2CP_WOL . H2CP_EOL);
}
fwrite($fp, 'Host: ' . $uri['host'] . H2CP_WOL . H2CP_EOL);
fwrite($fp, 'Connection: close' . H2CP_WOL . H2CP_EOL . H2CP_WOL . H2CP_EOL);
$isRedirect = true;
$isBody = false;
$isHttp = false;
$encode = null;
$mime = null;
$data = '';
while (false === feof($fp)) {
if (H2CP_MAX_EXEC !== 0 && (time() - H2CP_INIT_EXEC) >= H2CP_MAX_EXEC) {
return array('error' => 'Maximum execution time of ' . (H2CP_MAX_EXEC + 5) . ' seconds exceeded, configure this with ini_set/set_time_limit or "php.ini" (if safe_mode is enabled)');
}
$data = fgets($fp);
if ($data === false) {
continue;
}
if ($isHttp === false) {
if (preg_match('#^HTTP/1\.#i', $data) === 0) {
fclose($fp);//Close connection
$data = '';
return array('error' => 'This request did not return a HTTP response valid');
}
$tmp = preg_replace('#(HTTP/1[.]\\d |[^0-9])#i', '',
preg_replace('#^(HTTP/1[.]\\d \\d{3}) [\\w\\W]+$#i', '$1', $data)
);
if ($tmp === '304') {
fclose($fp);//Close connection
$data = '';
return array('error' => 'Request returned HTTP_304, this status code is incorrect because the html2canvas not send Etag');
} else {
$isRedirect = preg_match('#^3\\d{2}$#', $tmp) !== 0;
if ($isRedirect === false && $tmp !== '200') {
fclose($fp);
$data = '';
return array('error' => 'Request returned HTTP_' . $tmp);
}
$isHttp = true;
continue;
}
}
if ($isBody === false) {
if (preg_match('#^location[:]#i', $data) !== 0) {//200 force 302
fclose($fp);//Close connection
$data = trim(preg_replace('#^location[:]#i', '', $data));
if ($data === '') {
return array('error' => '"Location:" header is blank');
}
$nextUri = $data;
$data = relativeToAbsolute($url, $data);
if ($data === '') {
return array('error' => 'Invalid scheme in url (' . $nextUri . ')');
}
if (isHttpUrl($data) === false) {
return array('error' => '"Location:" header redirected for a non-http url (' . $data . ')');
}
return downloadSource($data, $toSource, $caller);
} elseif (preg_match('#^content-length[:](\\s)?0$#i', $data) !== 0) {
fclose($fp);
$data = '';
return array('error' => 'source is blank (Content-length: 0)');
} elseif (preg_match('#^content-type[:]#i', $data) !== 0) {
$response = checkContentType($data);
if (isset($response['error'])) {
fclose($fp);
return $response;
}
$encode = $response['encode'];
$mime = $response['mime'];
} elseif ($isBody === false && trim($data) === '') {
$isBody = true;
continue;
}
} elseif ($isRedirect) {
fclose($fp);
$data = '';
return array('error' => 'The response should be a redirect "' . $url . '", but did not inform which header "Localtion:"');
} elseif ($mime === null) {
fclose($fp);
$data = '';
return array('error' => 'Not set the mimetype from "' . $url . '"');
} else {
fwrite($toSource, $data);
continue;
}
}
fclose($fp);
$data = '';
if ($isBody === false) {
return array('error' => 'Content body is empty');
} elseif ($mime === null) {
return array('error' => 'Not set the mimetype from "' . $url . '"');
}
return array(
'mime' => $mime,
'encode' => $encode
);
}
}
if (empty($_SERVER['HTTP_HOST'])) {
$response = array('error' => 'The client did not send the Host header');
} elseif (empty($_SERVER['SERVER_PORT'])) {
$response = array('error' => 'The Server-proxy did not send the PORT (configure PHP)');
} elseif (H2CP_MAX_EXEC < 10) {
$response = array('error' => 'Execution time is less 15 seconds, configure this with ini_set/set_time_limit or "php.ini" (if safe_mode is enabled), recommended time is 30 seconds or more');
} elseif (H2CP_MAX_EXEC <= H2CP_TIMEOUT) {
$response = array('error' => 'The execution time is not configured enough to TIMEOUT in SOCKET, configure this with ini_set/set_time_limit or "php.ini" (if safe_mode is enabled), recommended that the "max_execution_time =;" be a minimum of 5 seconds longer or reduce the TIMEOUT in "define(\'H2CP_TIMEOUT\', ' . H2CP_TIMEOUT . ');"');
} elseif (empty($_GET['url'])) {
$response = array('error' => 'No such parameter "url"');
} elseif (isHttpUrl($_GET['url']) === false) {
$response = array('error' => 'Only http scheme and https scheme are allowed');
} elseif (isAllowedUrl($_GET['url'], $message) === false) {
$response = array('error' => $message);
} elseif (createFolder() === false) {
$err = error_get_last();
$response = array('error' => 'Can not create directory'. (
$err !== null && empty($err['message']) ? '' : (': ' . $err['message'])
));
$err = null;
} else {
$http_port = (int) $_SERVER['SERVER_PORT'];
$tmp = createTmpFile($_GET['url'], false);
if ($tmp === false) {
$err = error_get_last();
$response = array('error' => 'Can not create file'. (
$err !== null && empty($err['message']) ? '' : (': ' . $err['message'])
));
$err = null;
} else {
$response = H2CP_PREFER_CURL && function_exists('curl_init') ?
curlDownloadSource($_GET['url'], $tmp['source']) :
downloadSource($_GET['url'], $tmp['source'], 0);
fclose($tmp['source']);
}
}
//set mime-type
header('Content-Type: application/javascript');
if (is_array($response) && false === empty($response['mime'])) {
clearstatcache();
if (false === file_exists($tmp['location'])) {
$response = array('error' => 'Request was downloaded, but file can not be found, try again');
} elseif (filesize($tmp['location']) < 1) {
$response = array('error' => 'Request was downloaded, but there was some problem and now the file is empty, try again');
} else {
$extension = str_replace(array('image/', 'text/', 'application/'), '', $response['mime']);
$extension = str_replace(array('windows-bmp', 'ms-bmp'), 'bmp', $extension);
$extension = str_replace(array('svg+xml', 'svg-xml'), 'svg', $extension);
$extension = str_replace('xhtml+xml', 'xhtml', $extension);
$extension = str_replace('jpeg', 'jpg', $extension);
$locationFile = preg_replace('#[.][0-9_]+$#', '.' . $extension, $tmp['location']);
if (file_exists($locationFile)) {
unlink($locationFile);
}
if (rename($tmp['location'], $locationFile)) {
//set cache
setHeaders(false);
removeOldFiles();
$mime = $response['mime'];
if ($response['encode'] !== null) {
$mime .= ';charset=' . JsonEncodeString($response['encode'], true);
}
if (H2CP_JSONP === false) {
header('Content-Type: ' . $mime);
echo file_get_contents($locationFile);
} elseif (H2CP_DATAURI) {
$tmp = $response = null;
header('Content-Type: application/javascript');
if (strpos($mime, 'image/svg') !== 0 && strpos($mime, 'image/') === 0) {
echo H2CP_JSONP, '("data:', $mime, ';base64,',
base64_encode(
file_get_contents($locationFile)
),
'");';
} else {
echo H2CP_JSONP, '("data:', $mime, ',',
asciiToInline(file_get_contents($locationFile)),
'");';
}
} else {
$tmp = $response = null;
header('Content-Type: application/javascript');
$dir_name = dirname($_SERVER['SCRIPT_NAME']);
if ($dir_name === '\/' || $dir_name === '\\') {
$dir_name = '';
}
echo H2CP_JSONP, '(',
JsonEncodeString(
($http_port === 443 ? 'https://' : 'http://') .
preg_replace('#[:]\\d+$#', '', $_SERVER['HTTP_HOST']) .
($http_port === 80 || $http_port === 443 ? '' : (
':' . $_SERVER['SERVER_PORT']
)) .
$dir_name. '/' .
$locationFile
),
');';
}
exit;
} else {
$response = array('error' => 'Failed to rename the temporary file');
}
}
}
if (is_array($tmp) && isset($tmp['location']) && file_exists($tmp['location'])) {
// Remove temporary file if an error occurred
unlink($tmp['location']);
}
setHeaders(true); // no-cache
header('Content-Type: application/javascript');
removeOldFiles();
$callback = H2CP_JSONP !== false ? H2CP_JSONP : H2CP_ALTERNATIVE;
echo $callback, '(',
JsonEncodeString(
'error: html2canvas-proxy-php: ' . $response['error']
),
');';
- 最终效果
效果
目录结构.png
cache是缓存图片的目录，那个proxy2.php中可以定义缓存时间等参数
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