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<?php
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/**
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 * Copyright 2017 Facebook, Inc.
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 *
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 * You are hereby granted a non-exclusive, worldwide, royalty-free license to
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 * use, copy, modify, and distribute this software in source code or binary
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 * form for use in connection with the web services and APIs provided by
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 * Facebook.
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 *
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 * As with any software that integrates with the Facebook platform, your use
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 * of this software is subject to the Facebook Developer Principles and
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 * Policies [http://developers.facebook.com/policy/]. This copyright notice
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 * shall be included in all copies or substantial portions of the software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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 * DEALINGS IN THE SOFTWARE.
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 *
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 */
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namespace Facebook\Http;
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use Facebook\FileUpload\FacebookFile;
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/**
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 * Class RequestBodyMultipartt
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 *
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 * Some things copied from Guzzle
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 *
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 * @package Facebook
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 *
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 * @see https://github.com/guzzle/guzzle/blob/master/src/Post/MultipartBody.php
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 */
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class RequestBodyMultipart implements RequestBodyInterface
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{
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    /**
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     * @var string The boundary.
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     */
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    private $boundary;
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    /**
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     * @var array The parameters to send with this request.
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     */
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    private $params;
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    /**
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     * @var array The files to send with this request.
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     */
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    private $files = [];
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    /**
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     * @param array  $params   The parameters to send with this request.
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     * @param array  $files    The files to send with this request.
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     * @param string $boundary Provide a specific boundary.
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     */
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    public function __construct(array $params = [], array $files = [], $boundary = null)
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    {
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        $this->params = $params;
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        $this->files = $files;
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        $this->boundary = $boundary ?: uniqid();
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    }
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    /**
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     * @inheritdoc
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     */
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    public function getBody()
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    {
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        $body = '';
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        // Compile normal params
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        $params = $this->getNestedParams($this->params);
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        foreach ($params as $k => $v) {
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            $body .= $this->getParamString($k, $v);
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        }
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        // Compile files
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        foreach ($this->files as $k => $v) {
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            $body .= $this->getFileString($k, $v);
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        }
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        // Peace out
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        $body .= "--{$this->boundary}--\r\n";
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        return $body;
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    }
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    /**
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     * Get the boundary
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     *
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     * @return string
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     */
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    public function getBoundary()
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    {
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        return $this->boundary;
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    }
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    /**
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     * Get the string needed to transfer a file.
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     *
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     * @param string       $name
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     * @param FacebookFile $file
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     *
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     * @return string
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     */
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    private function getFileString($name, FacebookFile $file)
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    {
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        return sprintf(
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            "--%s\r\nContent-Disposition: form-data; name=\"%s\"; filename=\"%s\"%s\r\n\r\n%s\r\n",
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            $this->boundary,
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            $name,
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            $file->getFileName(),
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            $this->getFileHeaders($file),
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            $file->getContents()
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        );
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    }
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    /**
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     * Get the string needed to transfer a POST field.
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     *
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     * @param string $name
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     * @param string $value
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     *
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     * @return string
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     */
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    private function getParamString($name, $value)
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    {
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        return sprintf(
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            "--%s\r\nContent-Disposition: form-data; name=\"%s\"\r\n\r\n%s\r\n",
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            $this->boundary,
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            $name,
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            $value
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        );
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    }
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    /**
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     * Returns the params as an array of nested params.
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     *
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     * @param array $params
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     *
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     * @return array
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     */
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    private function getNestedParams(array $params)
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    {
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        $query = http_build_query($params, null, '&');
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        $params = explode('&', $query);
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        $result = [];
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        foreach ($params as $param) {
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            list($key, $value) = explode('=', $param, 2);
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            $result[urldecode($key)] = urldecode($value);
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        }
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        return $result;
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    }
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    /**
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     * Get the headers needed before transferring the content of a POST file.
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     *
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     * @param FacebookFile $file
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     *
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     * @return string
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     */
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    protected function getFileHeaders(FacebookFile $file)
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    {
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        return "\r\nContent-Type: {$file->getMimetype()}";
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    }
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}