how to implement an upload script with codeigniter

I am trying to implement a multiple file upload script to codeigniter. the script can be find here http://valums.com/ajax-upload/. I find it quite good, so I decide to put in current apps.

The problem is, I couldn't access the uploaded files with codeigniter. If you a codeigniter develop开发者_StackOverflow中文版er please advise how I could grap the file send by the script ?

---

CodeIgniter has a few ways to handle uploads, but since your ajax-upload script already has a handler, you should use that.

How to:

Create a new file in your application/libraries folder, named Qqfileuploader.php and paste this in it:

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
    class Qqfileuploader {
        private $allowedExtensions = array();
        private $sizeLimit = 10485760;
        private $file;

        function __construct(array $allowedExtensions = array(), $sizeLimit = 10485760){        
            $allowedExtensions = array_map("strtolower", $allowedExtensions);

            $this->allowedExtensions = $allowedExtensions;        
            $this->sizeLimit = $sizeLimit;

            $this->checkServerSettings();       

            if (isset($_GET['qqfile'])) {
                $this->file = new qqUploadedFileXhr();
            } elseif (isset($_FILES['qqfile'])) {
                $this->file = new qqUploadedFileForm();
            } else {
                $this->file = false; 
            }
        }

        private function checkServerSettings(){        
            $postSize = $this->toBytes(ini_get('post_max_size'));
            $uploadSize = $this->toBytes(ini_get('upload_max_filesize'));        

            if ($postSize < $this->sizeLimit || $uploadSize < $this->sizeLimit){
                $size = max(1, $this->sizeLimit / 1024 / 1024) . 'M';             
                die("{'error':'increase post_max_size and upload_max_filesize to $size'}");    
            }        
        }

        private function toBytes($str){
            $val = trim($str);
            $last = strtolower($str[strlen($str)-1]);
            switch($last) {
                case 'g': $val *= 1024;
                case 'm': $val *= 1024;
                case 'k': $val *= 1024;        
            }
            return $val;
        }

        /**
         * Returns array('success'=>true) or array('error'=>'error message')
         */
        function handleUpload($uploadDirectory, $replaceOldFile = FALSE){
            if (!is_writable($uploadDirectory)){
                return array('error' => "Server error. Upload directory isn't writable.");
            }

            if (!$this->file){
                return array('error' => 'No files were uploaded.');
            }

            $size = $this->file->getSize();

            if ($size == 0) {
                return array('error' => 'File is empty');
            }

            if ($size > $this->sizeLimit) {
                return array('error' => 'File is too large');
            }

            $pathinfo = pathinfo($this->file->getName());
            $filename = $pathinfo['filename'];
            //$filename = md5(uniqid());
            $ext = $pathinfo['extension'];

            if($this->allowedExtensions && !in_array(strtolower($ext), $this->allowedExtensions)){
                $these = implode(', ', $this->allowedExtensions);
                return array('error' => 'File has an invalid extension, it should be one of '. $these . '.');
            }

            if(!$replaceOldFile){
                /// don't overwrite previous files that were uploaded
                while (file_exists($uploadDirectory . $filename . '.' . $ext)) {
                    $filename .= rand(10, 99);
                }
            }

            if ($this->file->save($uploadDirectory . $filename . '.' . $ext)){
                return array('success'=>true);
            } else {
                return array('error'=> 'Could not save uploaded file.' .
                    'The upload was cancelled, or server error encountered');
            }

        }    
    }

Now, in the controller that you're uploading to, do this:

// list of valid extensions, ex. array("jpeg", "xml", "bmp")
$allowedExtensions = array();
// max file size in bytes
$sizeLimit = 10 * 1024 * 1024;

$this->load->library("Qqfileuploader",array($allowedExtensions, $sizeLimit));
$this->Qqfileuploader->handleUpload('uploads/');
// to pass data through iframe you will need to encode all html tags
echo htmlspecialchars(json_encode($result), ENT_NOQUOTES);

That should work.

---

Actually CodeIgniter libraries seem to allow only 1 parameter to be passed to constructor. So the Adrian Gonzales's code didn't quite work for me - I had to change the constructor to accept the parameters as a single array (as noted here: http://codeigniter.com/user_guide/general/creating_libraries.html). And then it worked.

Here is my library code:

    <?php if (!defined('BASEPATH')) exit('No direct script access allowed');


class qqFileUploader {
    private $allowedExtensions = array();
    private $sizeLimit = 10485760;
    private $file;

    function __construct($params = array()){
        $allowedExtensions = $params['allowedExtensions'];
        $sizeLimit = $params['sizeLimit'];

        $allowedExtensions = array_map("strtolower", $allowedExtensions);

        $this->allowedExtensions = $allowedExtensions;        
        $this->sizeLimit = $sizeLimit;

        $this->checkServerSettings();       

        if (isset($_GET['qqfile'])) {
            $this->file = new qqUploadedFileXhr();
        } elseif (isset($_FILES['qqfile'])) {
            $this->file = new qqUploadedFileForm();
        } else {
            $this->file = false; 
        }
    }

    private function checkServerSettings(){        
        $postSize = $this->toBytes(ini_get('post_max_size'));
        $uploadSize = $this->toBytes(ini_get('upload_max_filesize'));        

        if ($postSize < $this->sizeLimit || $uploadSize < $this->sizeLimit){
            $size = max(1, $this->sizeLimit / 1024 / 1024) . 'M';             

            die("{'error':'increase post_max_size and upload_max_filesize to $size'}");    
        }        
    }

    private function toBytes($str){
        $val = trim($str);
        $last = strtolower($str[strlen($str)-1]);
        switch($last) {
            case 'g': $val *= 1024;
            case 'm': $val *= 1024;
            case 'k': $val *= 1024;        
        }
        return $val;
    }


    function handleUpload($uploadDirectory, $replaceOldFile = FALSE){
        if (!is_writable($uploadDirectory)){
            return array('error' => "Server error. Upload directory isn't writable.");
        }

        if (!$this->file){
            return array('error' => 'No files were uploaded.');
        }

        $size = $this->file->getSize();

        if ($size == 0) {
            return array('error' => 'File is empty');
        }

        if ($size > $this->sizeLimit) {
            return array('error' => 'File is too large');
        }

        $pathinfo = pathinfo($this->file->getName());
        //$filename = $pathinfo['filename'];
        $filename = md5(uniqid());
        $ext = $pathinfo['extension'];

        if($this->allowedExtensions && !in_array(strtolower($ext), $this->allowedExtensions)){
            $these = implode(', ', $this->allowedExtensions);
            return array('error' => 'File has an invalid extension, it should be one of '. $these . '.');
        }

        if(!$replaceOldFile){
            /// don't overwrite previous files that were uploaded
            while (file_exists($uploadDirectory . $filename . '.' . $ext)) {
                $filename .= rand(10, 99);
            }
        }

        if ($this->file->save($uploadDirectory . $filename . '.' . $ext)){
            return array('success'=>true, 'fileName' => $filename . '.' . $ext);
        } else {
            return array('error'=> 'Could not save uploaded file.' .
                'The upload was cancelled, or server error encountered');
        }

    }    
}


class qqUploadedFileXhr {

    function save($path) {    
        $input = fopen("php://input", "r");
        $temp = tmpfile();
        $realSize = stream_copy_to_stream($input, $temp);
        fclose($input);

        if ($realSize != $this->getSize()){            
            return false;
        }

        $target = fopen($path, "w");        
        fseek($temp, 0, SEEK_SET);
        stream_copy_to_stream($temp, $target);
        fclose($target);

        return true;
    }
    function getName() {
        return $_GET['qqfile'];
    }
    function getSize() {
        if (isset($_SERVER["CONTENT_LENGTH"])){
            return (int)$_SERVER["CONTENT_LENGTH"];            
        } else {
            throw new Exception('Getting content length is not supported.');
        }      
    }   
}


class qqUploadedFileForm {  
    /**
     * Save the file to the specified path
     * @return boolean TRUE on success
     */
    function save($path) {
        if(!move_uploaded_file($_FILES['qqfile']['tmp_name'], $path)){
            return false;
        }
        return true;
    }
    function getName() {
        return $_FILES['qqfile']['name'];
    }
    function getSize() {
        return $_FILES['qqfile']['size'];
    }
}

---

Take a lot to the /server/php.php file: https://github.com/valums/file-uploader/blob/master/server/php.php

You've to reproduce something like that on your controller to handle the XMLHttpRequest of the ajax script.

---

I find a very easy solution.

First, go to the script, edit the querystring variable, so that i will produce segmented uri.

Then In the controller, I use file_get_contents("php://input") to grab the content. To get the name of the file just do $this->input->uri(3);