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<?php

/**
 * This file is part of CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace CodeIgniter\HTTP\Files;

use RecursiveArrayIterator;
use RecursiveIteratorIterator;

/**
 * Class FileCollection
 *
 * Provides easy access to uploaded files for a request.
 */
class FileCollection
{
    /**
     * An array of UploadedFile instances for any files
     * uploaded as part of this request.
     * Populated the first time either files(), file(), or hasFile()
     * is called.
     *
     * @var array|null
     */
    protected $files;

    /**
     * Returns an array of all uploaded files that were found.
     * Each element in the array will be an instance of UploadedFile.
     * The key of each element will be the client filename.
     *
     * @return array|null
     */
    public function all()
    {
        $this->populateFiles();

        return $this->files;
    }

    /**
     * Attempts to get a single file from the collection of uploaded files.
     *
     * @return UploadedFile|null
     */
    public function getFile(string $name)
    {
        $this->populateFiles();

        if ($this->hasFile($name)) {
            if (strpos($name, '.') !== false) {
                $name         = explode('.', $name);
                $uploadedFile = $this->getValueDotNotationSyntax($name, $this->files);

                return $uploadedFile instanceof UploadedFile ? $uploadedFile : null;
            }

            if (array_key_exists($name, $this->files)) {
                $uploadedFile = $this->files[$name];

                return $uploadedFile instanceof UploadedFile ? $uploadedFile : null;
            }
        }

        return null;
    }

    /**
     * Verify if a file exist in the collection of uploaded files and is have been uploaded with multiple option.
     *
     * @return array|null
     */
    public function getFileMultiple(string $name)
    {
        $this->populateFiles();

        if ($this->hasFile($name)) {
            if (strpos($name, '.') !== false) {
                $name         = explode('.', $name);
                $uploadedFile = $this->getValueDotNotationSyntax($name, $this->files);

                return (is_array($uploadedFile) && ($uploadedFile[array_key_first($uploadedFile)] instanceof UploadedFile)) ?
                    $uploadedFile : null;
            }

            if (array_key_exists($name, $this->files)) {
                $uploadedFile = $this->files[$name];

                return (is_array($uploadedFile) && ($uploadedFile[array_key_first($uploadedFile)] instanceof UploadedFile)) ?
                    $uploadedFile : null;
            }
        }

        return null;
    }

    /**
     * Checks whether an uploaded file with name $fileID exists in
     * this request.
     *
     * @param string $fileID The name of the uploaded file (from the input)
     */
    public function hasFile(string $fileID): bool
    {
        $this->populateFiles();

        if (strpos($fileID, '.') !== false) {
            $segments = explode('.', $fileID);

            $el = $this->files;

            foreach ($segments as $segment) {
                if (! array_key_exists($segment, $el)) {
                    return false;
                }

                $el = $el[$segment];
            }

            return true;
        }

        return isset($this->files[$fileID]);
    }

    /**
     * Taking information from the $_FILES array, it creates an instance
     * of UploadedFile for each one, saving the results to this->files.
     *
     * Called by files(), file(), and hasFile()
     */
    protected function populateFiles()
    {
        if (is_array($this->files)) {
            return;
        }

        $this->files = [];

        if (empty($_FILES)) {
            return;
        }

        $files = $this->fixFilesArray($_FILES);

        foreach ($files as $name => $file) {
            $this->files[$name] = $this->createFileObject($file);
        }
    }

    /**
     * Given a file array, will create UploadedFile instances. Will
     * loop over an array and create objects for each.
     *
     * @return array|UploadedFile
     */
    protected function createFileObject(array $array)
    {
        if (! isset($array['name'])) {
            $output = [];

            foreach ($array as $key => $values) {
                if (! is_array($values)) {
                    continue;
                }

                $output[$key] = $this->createFileObject($values);
            }

            return $output;
        }

        return new UploadedFile(
            $array['tmp_name'] ?? null,
            $array['name'] ?? null,
            $array['type'] ?? null,
            $array['size'] ?? null,
            $array['error'] ?? null
        );
    }

    /**
     * Reformats the odd $_FILES array into something much more like
     * we would expect, with each object having its own array.
     *
     * Thanks to Jack Sleight on the PHP Manual page for the basis
     * of this method.
     *
     * @see http://php.net/manual/en/reserved.variables.files.php#118294
     */
    protected function fixFilesArray(array $data): array
    {
        $output = [];

        foreach ($data as $name => $array) {
            foreach ($array as $field => $value) {
                $pointer = &$output[$name];

                if (! is_array($value)) {
                    $pointer[$field] = $value;

                    continue;
                }

                $stack    = [&$pointer];
                $iterator = new RecursiveIteratorIterator(
                    new RecursiveArrayIterator($value),
                    RecursiveIteratorIterator::SELF_FIRST
                );

                foreach ($iterator as $key => $val) {
                    array_splice($stack, $iterator->getDepth() + 1);
                    $pointer = &$stack[count($stack) - 1];
                    $pointer = &$pointer[$key];
                    $stack[] = &$pointer;

                    // RecursiveIteratorIterator::hasChildren() can be used. RecursiveIteratorIterator
                    // forwards all unknown method calls to the underlying RecursiveIterator internally.
                    // See https://github.com/php/doc-en/issues/787#issuecomment-881446121
                    if (! $iterator->hasChildren()) {
                        $pointer[$field] = $val;
                    }
                }
            }
        }

        return $output;
    }

    /**
     * Navigate through an array looking for a particular index
     *
     * @param array $index The index sequence we are navigating down
     * @param array $value The portion of the array to process
     *
     * @return mixed
     */
    protected function getValueDotNotationSyntax(array $index, array $value)
    {
        $currentIndex = array_shift($index);

        if (isset($currentIndex) && is_array($index) && $index && is_array($value[$currentIndex]) && $value[$currentIndex]) {
            return $this->getValueDotNotationSyntax($index, $value[$currentIndex]);
        }

        return $value[$currentIndex] ?? null;
    }
}

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