Proyectos de Subversion Moodle

<?php

namespace Aws\Configuration;

class ConfigurationResolver

{

    const ENV_PROFILE = 'AWS_PROFILE';

    const ENV_CONFIG_FILE = 'AWS_CONFIG_FILE';

    public static $envPrefix = 'AWS_';

    /**

     * Generic configuration resolver that first checks for environment

     * variables, then checks for a specified profile in the environment-defined

     * config file location (env variable is 'AWS_CONFIG_FILE', file location

     * defaults to ~/.aws/config), then checks for the "default" profile in the

     * environment-defined config file location, and failing those uses a default

     * fallback value.

     *

     * @param string $key      Configuration key to be used when attempting

     *                         to retrieve value from the environment or ini file.

     * @param mixed $defaultValue

     * @param string $expectedType  The expected type of the retrieved value.

     * @param array $config additional configuration options.

     *

     * @return mixed

     */

    public static function resolve(

        $key,

        $defaultValue,

        $expectedType,

        $config = []

    )

    {

        $iniOptions = isset($config['ini_resolver_options'])

            ? $config['ini_resolver_options']

            : [];

        $envValue = self::env($key, $expectedType);

        if (!is_null($envValue)) {

            return $envValue;

        }

        if (!isset($config['use_aws_shared_config_files'])

            || $config['use_aws_shared_config_files'] != false

        ) {

            $iniValue = self::ini(

                $key,

                $expectedType,

                null,

                null,

                $iniOptions

            );

            if(!is_null($iniValue)) {

                return $iniValue;

            }

        }

        return $defaultValue;

    }

    /**

     * Resolves config values from environment variables.

     *

     * @param string $key      Configuration key to be used when attempting

     *                         to retrieve value from the environment.

     * @param string $expectedType  The expected type of the retrieved value.

     *

     * @return null | mixed

     */

    public static function env($key, $expectedType)

    {

        // Use config from environment variables, if available

        $envValue = getenv(self::$envPrefix . strtoupper($key));

        if (!empty($envValue)) {

            if ($expectedType) {

                $envValue = self::convertType($envValue, $expectedType);

            }

            return $envValue;

        }

        return null;

    }

    /**

     * Gets config values from a config file whose location

     * is specified by an environment variable 'AWS_CONFIG_FILE', defaulting to

     * ~/.aws/config if not specified

     *

     *

     * @param string $key      Configuration key to be used when attempting

     *                         to retrieve value from ini file.

     * @param string $expectedType  The expected type of the retrieved value.

     * @param string|null $profile  Profile to use. If not specified will use

     *                              the "default" profile.

     * @param string|null $filename If provided, uses a custom filename rather

     *                              than looking in the default directory.

     *

     * @return null | mixed

     */

    public static function ini(

        $key,

        $expectedType,

        $profile = null,

        $filename = null,

        $options = []

    ){

        $filename = $filename ?: (self::getDefaultConfigFilename());

        $profile = $profile ?: (getenv(self::ENV_PROFILE) ?: 'default');

        if (!@is_readable($filename)) {

            return null;

        }

        // Use INI_SCANNER_NORMAL instead of INI_SCANNER_TYPED for PHP 5.5 compatibility

        //TODO change after deprecation

        $data = @\Aws\parse_ini_file($filename, true, INI_SCANNER_NORMAL);

        if (isset($options['section'])

            && isset($options['subsection'])

            && isset($options['key']))

        {

            return self::retrieveValueFromIniSubsection(

                $data,

                $profile,

                $filename,

                $expectedType,

                $options

            );

        }

        if ($data === false

            || !isset($data[$profile])

            || !isset($data[$profile][$key])

        ) {

            return null;

        }

        // INI_SCANNER_NORMAL parses false-y values as an empty string

        if ($data[$profile][$key] === "") {

            if ($expectedType === 'bool') {

                $data[$profile][$key] = false;

            } elseif ($expectedType === 'int') {

                $data[$profile][$key] = 0;

            }

        }

        return self::convertType($data[$profile][$key], $expectedType);

    }

    /**

     * Gets the environment's HOME directory if available.

     *

     * @return null | string

     */

    private static function getHomeDir()

    {

        // On Linux/Unix-like systems, use the HOME environment variable

        if ($homeDir = getenv('HOME')) {

            return $homeDir;

        }

        // Get the HOMEDRIVE and HOMEPATH values for Windows hosts

        $homeDrive = getenv('HOMEDRIVE');

        $homePath = getenv('HOMEPATH');

        return ($homeDrive && $homePath) ? $homeDrive . $homePath : null;

    }

    /**

     * Gets default config file location from environment, falling back to aws

     * default location

     *

     * @return string

     */

    private static function getDefaultConfigFilename()

    {

        if ($filename = getenv(self::ENV_CONFIG_FILE)) {

            return $filename;

        }

        return self::getHomeDir() . '/.aws/config';

    }

    /**

     * Normalizes string values pulled out of ini files and

     * environment variables.

     *

     * @param string $value The value retrieved from the environment or

     *                      ini file.

     * @param $type $string The type that the value needs to be converted to.

     *

     * @return mixed

     */

    private static function convertType($value, $type)

    {

        if ($type === 'bool'

            && !is_null($convertedValue = \Aws\boolean_value($value))

        ) {

            return $convertedValue;

        }

        if ($type === 'int'

            && filter_var($value, FILTER_VALIDATE_INT)

        ) {

            $value = intVal($value);

        }

        return $value;

    }

    /**

     * Normalizes string values pulled out of ini files and

     * environment variables.

     *

     * @param array $data The data retrieved the ini file

     * @param string $profile The specified ini profile

     * @param string $filename The full path to the ini file

     * @param array $options Additional arguments passed to the configuration resolver

     *

     * @return mixed

     */

    private static function retrieveValueFromIniSubsection(

        $data,

        $profile,

        $filename,

        $expectedType,

        $options

    ){

        $section = $options['section'];

        if ($data === false

            || !isset($data[$profile][$section])

            || !isset($data["{$section} {$data[$profile][$section]}"])

        ) {

            return null;

        }

        $services_section = \Aws\parse_ini_section_with_subsections(

            $filename,

            "services {$data[$profile]['services']}"

        );

        if (!isset($services_section[$options['subsection']][$options['key']])

        ) {

            return null;

        }

        return self::convertType(

            $services_section[$options['subsection']][$options['key']],

            $expectedType

        );

    }

}