Centos下PHP无法Curl模拟Post上传文件的问题

有个产品需要上传图片到贴图库。为此还开了个贴图库的会员。

用的方案是ueditor+贴图库插件，自己加了个从dz拉过来的前端上传控件，然后禁用了Ueditor的上传按钮，毕竟数据先过一次后端再到贴图库是很蛋疼的事情。

决定禁用的关键是，贴图库给出的插件还是远程拉图模式，也就是说，产品有CDN，图片先从用户手里到达服务器tmp目录，Ueditor保存到upload目录，贴图库再访问cdn抓图，图片还得从Cdn过一遍，而Cdn有时不及时抓取，则导致贴图库抓不到文件，心累。

禁用后，发现Ueditor本地上传目录还是老是有文件出现，很是奇怪，今天下午干脆研究一下，试了多种方式最后猜测到是直接拖动图片到编辑器会导致上传行为。

本想直接改前端，把前端上传行为转向贴图库，后来放弃，还是先从后台着手解决。

发现贴图库sdk里明明有post上传的函数，却不用，改了一下，发现硬是传不上去。

原来Curl的Post发送文件，在Centos下会有问题，国外的大神给出了解决方案，竟然是自写Curl的Body部份，心疼

关键函数：这里$assoc是正常post数据数组，$files是文件数据数组（文件地址值不要再加@了，里面有file_get_contents）

function curl_custom_postfields($ch, $assoc = array(), $files = array()) {
    
    // invalid characters for "name" and "filename"
    static $disallow = array("\0", "\"", "\r", "\n");
    
    // build normal parameters
    foreach ($assoc as $k => $v) {
        $k = str_replace($disallow, "_", $k);
        $body[] = implode("\r\n", array(
            "Content-Disposition: form-data; name=\"{$k}\"",
            "",
            filter_var($v), 
        ));
    }
    
    // build file parameters
    foreach ($files as $k => $v) {
    
        switch (true) {
            case false === $v = realpath(filter_var($v)):
            case !is_file($v):
            case !is_readable($v):
                continue; // or return false, throw new InvalidArgumentException
        }
        $data = file_get_contents($v);
        $v = call_user_func("end", explode(DIRECTORY_SEPARATOR, $v));
        $k = str_replace($disallow, "_", $k);
        $v = str_replace($disallow, "_", $v);
        $body[] = implode("\r\n", array(
            "Content-Disposition: form-data; name=\"{$k}\"; filename=\"{$v}\"",
            "Content-Type: image/jpeg",        //这里根据我自己需求修改的，貌似随便改别的也并不影响，起码贴图库不管
            "",
            $data, 
        ));
    }
    
    // generate safe boundary 
    do {
        $boundary = "---------------------" . md5(mt_rand() . microtime());
    } while (preg_grep("/{$boundary}/", $body));
    
    // add boundary for each parameters
    array_walk($body, function (&$part) use ($boundary) {
        $part = "--{$boundary}\r\n{$part}";
    });
    
    // add final boundary
    $body[] = "--{$boundary}--";
    $body[] = "";
    
    // set options
    return @curl_setopt_array($ch, array(
        CURLOPT_POST       => true,
        CURLOPT_POSTFIELDS => implode("\r\n", $body),
        CURLOPT_HTTPHEADER => array(
            "Expect: 100-continue",
            "Content-Type: multipart/form-data; boundary={$boundary}", // change Content-Type
        ),
    ));
}

function curl_custom_postfields($ch, $assoc = array(), $files = array()) {

// invalid characters for "name" and "filename"

static $disallow = array("\0", "\"", "\r", "\n");

// build normal parameters

foreach ($assoc as $k => $v) {

$k = str_replace($disallow, "_", $k);

$body[] = implode("\r\n", array(

"Content-Disposition: form-data; name=\"{$k}\"",

"",

filter_var($v),

));

}

// build file parameters

foreach ($files as $k => $v) {

switch (true) {

case false === $v = realpath(filter_var($v)):

case !is_file($v):

case !is_readable($v):

continue; // or return false, throw new InvalidArgumentException

}

$data = file_get_contents($v);

$v = call_user_func("end", explode(DIRECTORY_SEPARATOR, $v));

$k = str_replace($disallow, "_", $k);

$v = str_replace($disallow, "_", $v);

$body[] = implode("\r\n", array(

"Content-Disposition: form-data; name=\"{$k}\"; filename=\"{$v}\"",

"Content-Type: image/jpeg", //这里根据我自己需求修改的，貌似随便改别的也并不影响，起码贴图库不管

"",

$data,

));

}

// generate safe boundary

do {

$boundary = "---------------------" . md5(mt_rand() . microtime());

} while (preg_grep("/{$boundary}/", $body));

// add boundary for each parameters

array_walk($body, function (&$part) use ($boundary) {

$part = "--{$boundary}\r\n{$part}";

});

// add final boundary

$body[] = "--{$boundary}--";

$body[] = "";

// set options

return @curl_setopt_array($ch, array(

CURLOPT_POST => true,

CURLOPT_POSTFIELDS => implode("\r\n", $body),

CURLOPT_HTTPHEADER => array(

"Expect: 100-continue",

"Content-Type: multipart/form-data; boundary={$boundary}", // change Content-Type

));

}

方法怎么调用：贴图库sdk的是post，我加了个postPlus

function postPlus($url,$postA,$postB){

		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_BINARYTRANSFER,true);
		curl_setopt($ch, CURLOPT_TIMEOUT,30);
		
		$this->curl_custom_postfields($ch, $postA, $postB);  //这里是关键
		
		$output = curl_exec($ch);
		curl_close($ch);
		return $output;
}

function postPlus($url,$postA,$postB){

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

curl_setopt($ch, CURLOPT_BINARYTRANSFER,true);

curl_setopt($ch, CURLOPT_TIMEOUT,30);

$this->curl_custom_postfields($ch, $postA, $postB); //这里是关键

$output = curl_exec($ch);

curl_close($ch);

return $output;

}

还需要修改贴图库sdk的上传方法

	function uploadFile($aid,$file=null){
		$url = $this->upload_host;
		$param['deadline'] = time()+$this->timeout;
		$param['aid'] = $aid;
		$Token=$this->op_Token->dealParam($param)->createToken();
		$data['Token']=$Token;
		$data1['file']=$file; //这里区分开来，文件数组
		return empty($file)?$Token:$this->postPlus($url,$data,$data1);
	}

function uploadFile($aid,$file=null){

$url = $this->upload_host;

$param['deadline'] = time()+$this->timeout;

$param['aid'] = $aid;

$Token=$this->op_Token->dealParam($param)->createToken();

$data['Token']=$Token;

$data1['file']=$file; //这里区分开来，文件数组

return empty($file)?$Token:$this->postPlus($url,$data,$data1);

}

最后修改Ueditor+贴图库的 Uploader.class.php，原本的uploadFromWeb改为uploadFile，直接丢临时文件$this->file[“tmp_name”]进去，再把Ueditor的move_uploaded_file处理注释掉，返回的stateInfo强制改为SUCCESS，完工！

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