代码研磨 Slim v3 (二)--app->run()

/**
 * Create new Uri from environment.
 *
 * @param Environment $env
 *
 * @return self
 */
public static function createFromEnvironment(Environment $env)
{
    // Scheme
    $isSecure = $env->get(‘HTTPS‘);
    $scheme = (empty($isSecure) || $isSecure === ‘off‘) ? ‘http‘ : ‘https‘;

    // Authority: Username and password
    $username = $env->get(‘PHP_AUTH_USER‘, ‘‘);
    $password = $env->get(‘PHP_AUTH_PW‘, ‘‘);


    // Authority: Host
    if ($env->has(‘HTTP_HOST‘)) {
        $host = $env->get(‘HTTP_HOST‘);
    } else {
        $host = $env->get(‘SERVER_NAME‘);
    }

    // Authority: Port
    $port = (int)$env->get(‘SERVER_PORT‘, 80);
    if (preg_match(‘/^(\[[a-fA-F0-9:.]+\])(:\d+)?\z/‘, $host, $matches)) {
        $host = $matches[1];

        if ($matches[2]) {
            $port = (int) substr($matches[2], 1);
        }
    } else {
        $pos = strpos($host, ‘:‘);
        if ($pos !== false) {
            $port = (int) substr($host, $pos + 1);
            $host = strstr($host, ‘:‘, true);
        }
    }

    // Path
    //文件名/脚本名
    $requestScriptName = parse_url($env->get(‘SCRIPT_NAME‘), PHP_URL_PATH);

    //其实是项目目录
    $requestScriptDir = dirname($requestScriptName);

    // parse_url() requires a full URL. As we don‘t extract the domain name or scheme,
    // we use a stand-in.

    //就是uri，主机名后面的字符串
    $requestUri = parse_url(‘http://example.com‘ . $env->get(‘REQUEST_URI‘), PHP_URL_PATH);


    $basePath = ‘‘;
    $virtualPath = $requestUri;

    if (stripos($requestUri, $requestScriptName) === 0) {
        $basePath = $requestScriptName;
    } elseif ($requestScriptDir !== ‘/‘ && stripos($requestUri, $requestScriptDir) === 0) {
        $basePath = $requestScriptDir;
    }

    if ($basePath) {
        //就是最后文件名或接口名
        $virtualPath = ltrim(substr($requestUri, strlen($basePath)), ‘/‘);
    }

    // Query string
    $queryString = $env->get(‘QUERY_STRING‘, ‘‘);

    // Fragment
    $fragment = ‘‘;

    // Build Uri
    $uri = new static($scheme, $host, $port, $virtualPath, $queryString, $fragment, $username, $password);
    if ($basePath) {
        $uri = $uri->withBasePath($basePath);
    }

    return $uri;
}

class Headers extends Collection implements HeadersInterface
/**
 * Create new headers collection with data extracted from
 * the application Environment object
 *
 * @param Environment $environment The Slim application Environment
 *
 * @return self
 */
public static function createFromEnvironment(Environment $environment)
{
    $data = [];
    foreach ($environment as $key => $value) {
        $key = strtoupper($key);
        if (isset(static::$special[$key]) || strpos($key, ‘HTTP_‘) === 0) {
            if ($key !== ‘HTTP_CONTENT_LENGTH‘) {
                $data[$key] =  $value;
            }
        }
    }

    return new static($data);
}
/**
 * Set HTTP header value
 *
 * This method sets a header value. It replaces
 * any values that may already exist for the header name.
 *
 * @param string $key   The case-insensitive header name
 * @param string $value The header value
 */
public function set($key, $value)
{
    if (!is_array($value)) {
        $value = [$value];
    }
    parent::set($this->normalizeKey($key), [
        ‘value‘ => $value,
        ‘originalKey‘ => $key
    ]);
}

/**
 * Get HTTP header value
 *
 * @param  string  $key     The case-insensitive header name
 * @param  mixed   $default The default value if key does not exist
 *
 * @return string[]
 */
public function get($key, $default = null)
{
    if ($this->has($key)) {
        return parent::get($this->normalizeKey($key))[‘value‘];
    }

    return $default;
}

class Cookies implements CookiesInterface
/**
 * Parse HTTP request `Cookie:` header and extract
 * into a PHP associative array.
 *
 * @param  string $header The raw HTTP request `Cookie:` header
 *
 * @return array Associative array of cookie names and values
 *
 * @throws InvalidArgumentException if the cookie data cannot be parsed
 */
public static function parseHeader($header)
{
    if (is_array($header) === true) {
        $header = isset($header[0]) ? $header[0] : ‘‘;
    }

    if (is_string($header) === false) {
        throw new InvalidArgumentException(‘Cannot parse Cookie data. Header value must be a string.‘);
    }

    $header = rtrim($header, "\r\n");
    $pieces = preg_split(‘@\s*[;,]\s*@‘, $header);

    $cookies = [];

    foreach ($pieces as $cookie) {
        $cookie = explode(‘=‘, $cookie, 2);

        if (count($cookie) === 2) {
            $key = urldecode($cookie[0]);
            $value = urldecode($cookie[1]);

            if (!isset($cookies[$key])) {
                $cookies[$key] = $value;
            }
        }
    }
    return $cookies;
}