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Filename : InteractsWithInput.php
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<?php

namespace Illuminate\Http\Concerns;

use SplFileInfo;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use Illuminate\Http\UploadedFile;

trait InteractsWithInput
{
    /**
     * Retrieve a server variable from the request.
     *
     * @param  string  $key
     * @param  string|array|null  $default
     * @return string|array
     */
    public function server($key = null, $default = null)
    {
        return $this->retrieveItem('server', $key, $default);
    }

    /**
     * Determine if a header is set on the request.
     *
     * @param  string  $key
     * @return bool
     */
    public function hasHeader($key)
    {
        return ! is_null($this->header($key));
    }

    /**
     * Retrieve a header from the request.
     *
     * @param  string  $key
     * @param  string|array|null  $default
     * @return string|array
     */
    public function header($key = null, $default = null)
    {
        return $this->retrieveItem('headers', $key, $default);
    }

    /**
     * Get the bearer token from the request headers.
     *
     * @return string|null
     */
    public function bearerToken()
    {
        $header = $this->header('Authorization', '');

        if (Str::startsWith($header, 'Bearer ')) {
            return Str::substr($header, 7);
        }
    }

    /**
     * Determine if the request contains a given input item key.
     *
     * @param  string|array  $key
     * @return bool
     */
    public function exists($key)
    {
        $keys = is_array($key) ? $key : func_get_args();

        $input = $this->all();

        foreach ($keys as $value) {
            if (! Arr::has($input, $value)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Determine if the request contains a non-empty value for an input item.
     *
     * @param  string|array  $key
     * @return bool
     */
    public function has($key)
    {
        $keys = is_array($key) ? $key : func_get_args();

        foreach ($keys as $value) {
            if ($this->isEmptyString($value)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Determine if the given input key is an empty string for "has".
     *
     * @param  string  $key
     * @return bool
     */
    protected function isEmptyString($key)
    {
        $value = $this->input($key);

        return ! is_bool($value) && ! is_array($value) && trim((string) $value) === '';
    }

    /**
     * Get all of the input and files for the request.
     *
     * @return array
     */
    public function all()
    {
        return array_replace_recursive($this->input(), $this->allFiles());
    }

    /**
     * Retrieve an input item from the request.
     *
     * @param  string  $key
     * @param  string|array|null  $default
     * @return string|array
     */
    public function input($key = null, $default = null)
    {
        return data_get(
            $this->getInputSource()->all() + $this->query->all(), $key, $default
        );
    }

    /**
     * Get a subset containing the provided keys with values from the input data.
     *
     * @param  array|mixed  $keys
     * @return array
     */
    public function only($keys)
    {
        $keys = is_array($keys) ? $keys : func_get_args();

        $results = [];

        $input = $this->all();

        foreach ($keys as $key) {
            Arr::set($results, $key, data_get($input, $key));
        }

        return $results;
    }

    /**
     * Get all of the input except for a specified array of items.
     *
     * @param  array|mixed  $keys
     * @return array
     */
    public function except($keys)
    {
        $keys = is_array($keys) ? $keys : func_get_args();

        $results = $this->all();

        Arr::forget($results, $keys);

        return $results;
    }

    /**
     * Intersect an array of items with the input data.
     *
     * @param  array|mixed  $keys
     * @return array
     */
    public function intersect($keys)
    {
        return array_filter($this->only(is_array($keys) ? $keys : func_get_args()));
    }

    /**
     * Retrieve a query string item from the request.
     *
     * @param  string  $key
     * @param  string|array|null  $default
     * @return string|array
     */
    public function query($key = null, $default = null)
    {
        return $this->retrieveItem('query', $key, $default);
    }

    /**
     * Determine if a cookie is set on the request.
     *
     * @param  string  $key
     * @return bool
     */
    public function hasCookie($key)
    {
        return ! is_null($this->cookie($key));
    }

    /**
     * Retrieve a cookie from the request.
     *
     * @param  string  $key
     * @param  string|array|null  $default
     * @return string|array
     */
    public function cookie($key = null, $default = null)
    {
        return $this->retrieveItem('cookies', $key, $default);
    }

    /**
     * Get an array of all of the files on the request.
     *
     * @return array
     */
    public function allFiles()
    {
        $files = $this->files->all();

        return $this->convertedFiles
                    ? $this->convertedFiles
                    : $this->convertedFiles = $this->convertUploadedFiles($files);
    }

    /**
     * Convert the given array of Symfony UploadedFiles to custom Laravel UploadedFiles.
     *
     * @param  array  $files
     * @return array
     */
    protected function convertUploadedFiles(array $files)
    {
        return array_map(function ($file) {
            if (is_null($file) || (is_array($file) && empty(array_filter($file)))) {
                return $file;
            }

            return is_array($file)
                        ? $this->convertUploadedFiles($file)
                        : UploadedFile::createFromBase($file);
        }, $files);
    }

    /**
     * Determine if the uploaded data contains a file.
     *
     * @param  string  $key
     * @return bool
     */
    public function hasFile($key)
    {
        if (! is_array($files = $this->file($key))) {
            $files = [$files];
        }

        foreach ($files as $file) {
            if ($this->isValidFile($file)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Check that the given file is a valid file instance.
     *
     * @param  mixed  $file
     * @return bool
     */
    protected function isValidFile($file)
    {
        return $file instanceof SplFileInfo && $file->getPath() != '';
    }

    /**
     * Retrieve a file from the request.
     *
     * @param  string  $key
     * @param  mixed  $default
     * @return \Illuminate\Http\UploadedFile|array|null
     */
    public function file($key = null, $default = null)
    {
        return data_get($this->allFiles(), $key, $default);
    }

    /**
     * Retrieve a parameter item from a given source.
     *
     * @param  string  $source
     * @param  string  $key
     * @param  string|array|null  $default
     * @return string|array
     */
    protected function retrieveItem($source, $key, $default)
    {
        if (is_null($key)) {
            return $this->$source->all();
        }

        return $this->$source->get($key, $default);
    }
}