RequestBodyMultipart.php

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<?php
namespace Facebook\Http;
 
use Facebook\FileUpload\FacebookFile;
 
class RequestBodyMultipart implements RequestBodyInterface
{
    private $boundary;
 
    private $params;
 
    private $files = [];
 
    public function __construct(array $params = [], array $files = [], $boundary = null)
    {
        $this->params = $params;
        $this->files = $files;
        $this->boundary = $boundary ?: uniqid();
    }
 
    public function getBody()
    {
        $body = '';
 
        // Compile normal params
        $params = $this->getNestedParams($this->params);
        foreach ($params as $k => $v) {
            $body .= $this->getParamString($k, $v);
        }
 
        // Compile files
        foreach ($this->files as $k => $v) {
            $body .= $this->getFileString($k, $v);
        }
 
        // Peace out
        $body .= "--{$this->boundary}--\r\n";
 
        return $body;
    }
 
    public function getBoundary()
    {
        return $this->boundary;
    }
 
    private function getFileString($name, FacebookFile $file)
    {
        return sprintf(
            "--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"%s\r\n\r\n%s\r\n",
            $this->boundary,
            $name,
            $file->getFileName(),
            $this->getFileHeaders($file),
            $file->getContents()
        );
    }
 
    private function getParamString($name, $value)
    {
        return sprintf(
            "--%s\r\nContent-Disposition: form-data; name=\"%s\"\r\n\r\n%s\r\n",
            $this->boundary,
            $name,
            $value
        );
    }
 
    private function getNestedParams(array $params)
    {
        $query = http_build_query($params, null, '&');
        $params = explode('&', $query);
        $result = [];
 
        foreach ($params as $param) {
            list($key, $value) = explode('=', $param, 2);
            $result[urldecode($key)] = urldecode($value);
        }
 
        return $result;
    }
 
    protected function getFileHeaders(FacebookFile $file)
    {
        return "\r\nContent-Type: {$file->getMimetype()}";
    }
}