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Filename : url_helper.php
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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.
 */

use CodeIgniter\HTTP\IncomingRequest;
use CodeIgniter\HTTP\URI;
use CodeIgniter\Router\Exceptions\RouterException;
use Config\App;
use Config\Services;

// CodeIgniter URL Helpers

if (! function_exists('_get_uri')) {
    /**
     * Used by the other URL functions to build a
     * framework-specific URI based on the App config.
     *
     * @internal Outside of the framework this should not be used directly.
     *
     * @param string $relativePath May include queries or fragments
     *
     * @throws InvalidArgumentException For invalid paths or config
     */
    function _get_uri(string $relativePath = '', ?App $config = null): URI
    {
        $config = $config ?? config('App');

        if ($config->baseURL === '') {
            throw new InvalidArgumentException('_get_uri() requires a valid baseURL.');
        }

        // If a full URI was passed then convert it
        if (is_int(strpos($relativePath, '://'))) {
            $full         = new URI($relativePath);
            $relativePath = URI::createURIString(null, null, $full->getPath(), $full->getQuery(), $full->getFragment());
        }

        $relativePath = URI::removeDotSegments($relativePath);

        // Build the full URL based on $config and $relativePath
        $url = rtrim($config->baseURL, '/ ') . '/';

        // Check for an index page
        if ($config->indexPage !== '') {
            $url .= $config->indexPage;

            // Check if we need a separator
            if ($relativePath !== '' && $relativePath[0] !== '/' && $relativePath[0] !== '?') {
                $url .= '/';
            }
        }

        $url .= $relativePath;

        $uri = new URI($url);

        // Check if the baseURL scheme needs to be coerced into its secure version
        if ($config->forceGlobalSecureRequests && $uri->getScheme() === 'http') {
            $uri->setScheme('https');
        }

        return $uri;
    }
}

if (! function_exists('site_url')) {
    /**
     * Returns a site URL as defined by the App config.
     *
     * @param mixed    $relativePath URI string or array of URI segments
     * @param App|null $config       Alternate configuration to use
     */
    function site_url($relativePath = '', ?string $scheme = null, ?App $config = null): string
    {
        // Convert array of segments to a string
        if (is_array($relativePath)) {
            $relativePath = implode('/', $relativePath);
        }

        $uri = _get_uri($relativePath, $config);

        return URI::createURIString($scheme ?? $uri->getScheme(), $uri->getAuthority(), $uri->getPath(), $uri->getQuery(), $uri->getFragment());
    }
}

if (! function_exists('base_url')) {
    /**
     * Returns the base URL as defined by the App config.
     * Base URLs are trimmed site URLs without the index page.
     *
     * @param mixed  $relativePath URI string or array of URI segments
     * @param string $scheme
     */
    function base_url($relativePath = '', ?string $scheme = null): string
    {
        $config            = clone config('App');
        $config->indexPage = '';

        return rtrim(site_url($relativePath, $scheme, $config), '/');
    }
}

if (! function_exists('current_url')) {
    /**
     * Returns the current full URL based on the IncomingRequest.
     * String returns ignore query and fragment parts.
     *
     * @param bool                 $returnObject True to return an object instead of a string
     * @param IncomingRequest|null $request      A request to use when retrieving the path
     *
     * @return string|URI
     */
    function current_url(bool $returnObject = false, ?IncomingRequest $request = null)
    {
        $request = $request ?? Services::request();
        $path    = $request->getPath();

        // Append queries and fragments
        if ($query = $request->getUri()->getQuery()) {
            $path .= '?' . $query;
        }
        if ($fragment = $request->getUri()->getFragment()) {
            $path .= '#' . $fragment;
        }

        $uri = _get_uri($path);

        return $returnObject ? $uri : URI::createURIString($uri->getScheme(), $uri->getAuthority(), $uri->getPath());
    }
}

if (! function_exists('previous_url')) {
    /**
     * Returns the previous URL the current visitor was on. For security reasons
     * we first check in a saved session variable, if it exists, and use that.
     * If that's not available, however, we'll use a sanitized url from $_SERVER['HTTP_REFERER']
     * which can be set by the user so is untrusted and not set by certain browsers/servers.
     *
     * @return mixed|string|URI
     */
    function previous_url(bool $returnObject = false)
    {
        // Grab from the session first, if we have it,
        // since it's more reliable and safer.
        // Otherwise, grab a sanitized version from $_SERVER.
        $referer = $_SESSION['_ci_previous_url'] ?? Services::request()->getServer('HTTP_REFERER', FILTER_SANITIZE_URL);

        $referer = $referer ?? site_url('/');

        return $returnObject ? new URI($referer) : $referer;
    }
}

if (! function_exists('uri_string')) {
    /**
     * URL String
     *
     * Returns the path part of the current URL
     *
     * @param bool $relative Whether the resulting path should be relative to baseURL
     */
    function uri_string(bool $relative = false): string
    {
        return $relative
            ? ltrim(Services::request()->getPath(), '/')
            : Services::request()->getUri()->getPath();
    }
}

if (! function_exists('index_page')) {
    /**
     * Index page
     *
     * Returns the "index_page" from your config file
     *
     * @param App|null $altConfig Alternate configuration to use
     */
    function index_page(?App $altConfig = null): string
    {
        // use alternate config if provided, else default one
        $config = $altConfig ?? config(App::class);

        return $config->indexPage;
    }
}

if (! function_exists('anchor')) {
    /**
     * Anchor Link
     *
     * Creates an anchor based on the local URL.
     *
     * @param mixed    $uri        URI string or array of URI segments
     * @param string   $title      The link title
     * @param mixed    $attributes Any attributes
     * @param App|null $altConfig  Alternate configuration to use
     */
    function anchor($uri = '', string $title = '', $attributes = '', ?App $altConfig = null): string
    {
        // use alternate config if provided, else default one
        $config = $altConfig ?? config(App::class);

        $siteUrl = is_array($uri) ? site_url($uri, null, $config) : (preg_match('#^(\w+:)?//#i', $uri) ? $uri : site_url($uri, null, $config));
        // eliminate trailing slash
        $siteUrl = rtrim($siteUrl, '/');

        if ($title === '') {
            $title = $siteUrl;
        }

        if ($attributes !== '') {
            $attributes = stringify_attributes($attributes);
        }

        return '<a href="' . $siteUrl . '"' . $attributes . '>' . $title . '</a>';
    }
}

if (! function_exists('anchor_popup')) {
    /**
     * Anchor Link - Pop-up version
     *
     * Creates an anchor based on the local URL. The link
     * opens a new window based on the attributes specified.
     *
     * @param string   $uri        the URL
     * @param string   $title      the link title
     * @param mixed    $attributes any attributes
     * @param App|null $altConfig  Alternate configuration to use
     */
    function anchor_popup($uri = '', string $title = '', $attributes = false, ?App $altConfig = null): string
    {
        // use alternate config if provided, else default one
        $config = $altConfig ?? config(App::class);

        $siteUrl = preg_match('#^(\w+:)?//#i', $uri) ? $uri : site_url($uri, null, $config);
        $siteUrl = rtrim($siteUrl, '/');

        if ($title === '') {
            $title = $siteUrl;
        }

        if ($attributes === false) {
            return '<a href="' . $siteUrl . '" onclick="window.open(\'' . $siteUrl . "', '_blank'); return false;\">" . $title . '</a>';
        }

        if (! is_array($attributes)) {
            $attributes = [$attributes];

            // Ref: http://www.w3schools.com/jsref/met_win_open.asp
            $windowName = '_blank';
        } elseif (! empty($attributes['window_name'])) {
            $windowName = $attributes['window_name'];
            unset($attributes['window_name']);
        } else {
            $windowName = '_blank';
        }

        foreach (['width' => '800', 'height' => '600', 'scrollbars' => 'yes', 'menubar' => 'no', 'status' => 'yes', 'resizable' => 'yes', 'screenx' => '0', 'screeny' => '0'] as $key => $val) {
            $atts[$key] = $attributes[$key] ?? $val;
            unset($attributes[$key]);
        }

        $attributes = stringify_attributes($attributes);

        return '<a href="' . $siteUrl
                . '" onclick="window.open(\'' . $siteUrl . "', '" . $windowName . "', '" . stringify_attributes($atts, true) . "'); return false;\""
                . $attributes . '>' . $title . '</a>';
    }
}

if (! function_exists('mailto')) {
    /**
     * Mailto Link
     *
     * @param string $email      the email address
     * @param string $title      the link title
     * @param mixed  $attributes any attributes
     */
    function mailto(string $email, string $title = '', $attributes = ''): string
    {
        if (trim($title) === '') {
            $title = $email;
        }

        return '<a href="mailto:' . $email . '"' . stringify_attributes($attributes) . '>' . $title . '</a>';
    }
}

if (! function_exists('safe_mailto')) {
    /**
     * Encoded Mailto Link
     *
     * Create a spam-protected mailto link written in Javascript
     *
     * @param string $email      the email address
     * @param string $title      the link title
     * @param mixed  $attributes any attributes
     */
    function safe_mailto(string $email, string $title = '', $attributes = ''): string
    {
        if (trim($title) === '') {
            $title = $email;
        }

        $x = str_split('<a href="mailto:', 1);

        for ($i = 0, $l = strlen($email); $i < $l; $i++) {
            $x[] = '|' . ord($email[$i]);
        }

        $x[] = '"';

        if ($attributes !== '') {
            if (is_array($attributes)) {
                foreach ($attributes as $key => $val) {
                    $x[] = ' ' . $key . '="';

                    for ($i = 0, $l = strlen($val); $i < $l; $i++) {
                        $x[] = '|' . ord($val[$i]);
                    }

                    $x[] = '"';
                }
            } else {
                for ($i = 0, $l = mb_strlen($attributes); $i < $l; $i++) {
                    $x[] = mb_substr($attributes, $i, 1);
                }
            }
        }

        $x[] = '>';

        $temp = [];

        for ($i = 0, $l = strlen($title); $i < $l; $i++) {
            $ordinal = ord($title[$i]);

            if ($ordinal < 128) {
                $x[] = '|' . $ordinal;
            } else {
                if (empty($temp)) {
                    $count = ($ordinal < 224) ? 2 : 3;
                }

                $temp[] = $ordinal;

                if (count($temp) === $count) {
                    $number = ($count === 3) ? (($temp[0] % 16) * 4096) + (($temp[1] % 64) * 64) + ($temp[2] % 64) : (($temp[0] % 32) * 64) + ($temp[1] % 64);
                    $x[]    = '|' . $number;
                    $count  = 1;
                    $temp   = [];
                }
            }
        }

        $x[] = '<';
        $x[] = '/';
        $x[] = 'a';
        $x[] = '>';

        $x = array_reverse($x);

        // improve obfuscation by eliminating newlines & whitespace
        $output = '<script type="text/javascript">'
                . 'var l=new Array();';

        foreach ($x as $i => $value) {
            $output .= 'l[' . $i . "] = '" . $value . "';";
        }

        return $output . ('for (var i = l.length-1; i >= 0; i=i-1) {'
                . "if (l[i].substring(0, 1) === '|') document.write(\"&#\"+unescape(l[i].substring(1))+\";\");"
                . 'else document.write(unescape(l[i]));'
                . '}'
                . '</script>');
    }
}

if (! function_exists('auto_link')) {
    /**
     * Auto-linker
     *
     * Automatically links URL and Email addresses.
     * Note: There's a bit of extra code here to deal with
     * URLs or emails that end in a period. We'll strip these
     * off and add them after the link.
     *
     * @param string $str   the string
     * @param string $type  the type: email, url, or both
     * @param bool   $popup whether to create pop-up links
     */
    function auto_link(string $str, string $type = 'both', bool $popup = false): string
    {
        // Find and replace any URLs.
        if ($type !== 'email' && preg_match_all('#(\w*://|www\.)[^\s()<>;]+\w#i', $str, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) {
            // Set our target HTML if using popup links.
            $target = ($popup) ? ' target="_blank"' : '';

            // We process the links in reverse order (last -> first) so that
            // the returned string offsets from preg_match_all() are not
            // moved as we add more HTML.
            foreach (array_reverse($matches) as $match) {
                // $match[0] is the matched string/link
                // $match[1] is either a protocol prefix or 'www.'
                //
                // With PREG_OFFSET_CAPTURE, both of the above is an array,
                // where the actual value is held in [0] and its offset at the [1] index.
                $a   = '<a href="' . (strpos($match[1][0], '/') ? '' : 'http://') . $match[0][0] . '"' . $target . '>' . $match[0][0] . '</a>';
                $str = substr_replace($str, $a, $match[0][1], strlen($match[0][0]));
            }
        }

        // Find and replace any emails.
        if ($type !== 'url' && preg_match_all('#([\w\.\-\+]+@[a-z0-9\-]+\.[a-z0-9\-\.]+[^[:punct:]\s])#i', $str, $matches, PREG_OFFSET_CAPTURE)) {
            foreach (array_reverse($matches[0]) as $match) {
                if (filter_var($match[0], FILTER_VALIDATE_EMAIL) !== false) {
                    $str = substr_replace($str, safe_mailto($match[0]), $match[1], strlen($match[0]));
                }
            }
        }

        return $str;
    }
}

if (! function_exists('prep_url')) {
    /**
     * Prep URL - Simply adds the http:// or https:// part if no scheme is included.
     *
     * Formerly used URI, but that does not play nicely with URIs missing
     * the scheme.
     *
     * @param string $str    the URL
     * @param bool   $secure set true if you want to force https://
     */
    function prep_url(string $str = '', bool $secure = false): string
    {
        if (in_array($str, ['http://', 'https://', '//', ''], true)) {
            return '';
        }

        if (parse_url($str, PHP_URL_SCHEME) === null) {
            $str = 'http://' . ltrim($str, '/');
        }

        // force replace http:// with https://
        if ($secure) {
            $str = preg_replace('/^(?:http):/i', 'https:', $str);
        }

        return $str;
    }
}

if (! function_exists('url_title')) {
    /**
     * Create URL Title
     *
     * Takes a "title" string as input and creates a
     * human-friendly URL string with a "separator" string
     * as the word separator.
     *
     * @param string $str       Input string
     * @param string $separator Word separator (usually '-' or '_')
     * @param bool   $lowercase Whether to transform the output string to lowercase
     */
    function url_title(string $str, string $separator = '-', bool $lowercase = false): string
    {
        $qSeparator = preg_quote($separator, '#');

        $trans = [
            '&.+?;'                  => '',
            '[^\w\d\pL\pM _-]'       => '',
            '\s+'                    => $separator,
            '(' . $qSeparator . ')+' => $separator,
        ];

        $str = strip_tags($str);

        foreach ($trans as $key => $val) {
            $str = preg_replace('#' . $key . '#iu', $val, $str);
        }

        if ($lowercase === true) {
            $str = mb_strtolower($str);
        }

        return trim(trim($str, $separator));
    }
}

if (! function_exists('mb_url_title')) {
    /**
     * Create URL Title that takes into account accented characters
     *
     * Takes a "title" string as input and creates a
     * human-friendly URL string with a "separator" string
     * as the word separator.
     *
     * @param string $str       Input string
     * @param string $separator Word separator (usually '-' or '_')
     * @param bool   $lowercase Whether to transform the output string to lowercase
     */
    function mb_url_title(string $str, string $separator = '-', bool $lowercase = false): string
    {
        helper('text');

        return url_title(convert_accented_characters($str), $separator, $lowercase);
    }
}

if (! function_exists('url_to')) {
    /**
     * Get the full, absolute URL to a controller method
     * (with additional arguments)
     *
     * @param mixed ...$args
     *
     * @throws RouterException
     */
    function url_to(string $controller, ...$args): string
    {
        if (! $route = route_to($controller, ...$args)) {
            $explode = explode('::', $controller);

            if (isset($explode[1])) {
                throw RouterException::forControllerNotFound($explode[0], $explode[1]);
            }

            throw RouterException::forInvalidRoute($controller);
        }

        return site_url($route);
    }
}

if (! function_exists('url_is')) {
    /**
     * Determines if current url path contains
     * the given path. It may contain a wildcard (*)
     * which will allow any valid character.
     *
     * Example:
     *   if (url_is('admin*)) ...
     */
    function url_is(string $path): bool
    {
        // Setup our regex to allow wildcards
        $path        = '/' . trim(str_replace('*', '(\S)*', $path), '/ ');
        $currentPath = '/' . trim(uri_string(true), '/ ');

        return (bool) preg_match("|^{$path}$|", $currentPath, $matches);
    }
}