File: application/modules/extensions/aws/Aws/functions.php

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File: application/modules/extensions/aws/Aws/functions.php
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<?php
namespace Aws;

use
Psr\Http\Message\RequestInterface;
use
GuzzleHttp\ClientInterface;
use
GuzzleHttp\Promise\FulfilledPromise;

//-----------------------------------------------------------------------------
// Functional functions
//-----------------------------------------------------------------------------

/**
 * Returns a function that always returns the same value;
 *
 * @param mixed $value Value to return.
 *
 * @return callable
 */
function constantly($value)
{
    return function () use (
$value) { return $value; };
}

/**
 * Filters values that do not satisfy the predicate function $pred.
 *
 * @param mixed $iterable Iterable sequence of data.
 * @param callable $pred Function that accepts a value and returns true/false
 *
 * @return \Generator
 */
function filter($iterable, callable $pred)
{
    foreach (
$iterable as $value) {
        if (
$pred($value)) {
            yield
$value;
        }
    }
}

/**
 * Applies a map function $f to each value in a collection.
 *
 * @param mixed $iterable Iterable sequence of data.
 * @param callable $f Map function to apply.
 *
 * @return \Generator
 */
function map($iterable, callable $f)
{
    foreach (
$iterable as $value) {
        yield
$f($value);
    }
}

/**
 * Creates a generator that iterates over a sequence, then iterates over each
 * value in the sequence and yields the application of the map function to each
 * value.
 *
 * @param mixed $iterable Iterable sequence of data.
 * @param callable $f Map function to apply.
 *
 * @return \Generator
 */
function flatmap($iterable, callable $f)
{
    foreach (
map($iterable, $f) as $outer) {
        foreach (
$outer as $inner) {
            yield
$inner;
        }
    }
}

/**
 * Partitions the input sequence into partitions of the specified size.
 *
 * @param mixed $iterable Iterable sequence of data.
 * @param int $size Size to make each partition (except possibly the last chunk)
 *
 * @return \Generator
 */
function partition($iterable, $size)
{
   
$buffer = [];
    foreach (
$iterable as $value) {
       
$buffer[] = $value;
        if (
count($buffer) === $size) {
            yield
$buffer;
           
$buffer = [];
        }
    }

    if (
$buffer) {
        yield
$buffer;
    }
}

/**
 * Returns a function that invokes the provided variadic functions one
 * after the other until one of the functions returns a non-null value.
 * The return function will call each passed function with any arguments it
 * is provided.
 *
 * $a = function ($x, $y) { return null; };
 * $b = function ($x, $y) { return $x + $y; };
 * $fn = \Aws\or_chain($a, $b);
 * echo $fn(1, 2); // 3
 *
 * @return callable
 */
function or_chain()
{
   
$fns = func_get_args();
    return function () use (
$fns) {
       
$args = func_get_args();
        foreach (
$fns as $fn) {
           
$result = $args ? call_user_func_array($fn, $args) : $fn();
            if (
$result) {
                return
$result;
            }
        }
        return
null;
    };
}

//-----------------------------------------------------------------------------
// JSON compiler and loading functions
//-----------------------------------------------------------------------------

/**
 * Loads a compiled JSON file from a PHP file.
 *
 * If the JSON file has not been cached to disk as a PHP file, it will be loaded
 * from the JSON source file and returned.
 *
 * @param string $path Path to the JSON file on disk
 *
 * @return mixed Returns the JSON decoded data. Note that JSON objects are
 * decoded as associative arrays.
 */
function load_compiled_json($path)
{
    if (
$compiled = @include("$path.php")) {
        return
$compiled;
    }

    if (!
file_exists($path)) {
        throw new \
InvalidArgumentException(
           
sprintf("File not found: %s", $path)
        );
    }

    return
json_decode(file_get_contents($path), true);
}

/**
 * No-op
 */
function clear_compiled_json()
{
   
// pass
}

//-----------------------------------------------------------------------------
// Directory iterator functions.
//-----------------------------------------------------------------------------

/**
 * Iterates over the files in a directory and works with custom wrappers.
 *
 * @param string $path Path to open (e.g., "s3://foo/bar").
 * @param resource $context Stream wrapper context.
 *
 * @return \Generator Yields relative filename strings.
 */
function dir_iterator($path, $context = null)
{
   
$dh = $context ? opendir($path, $context) : opendir($path);
    if (!
$dh) {
        throw new \
InvalidArgumentException('File not found: ' . $path);
    }
    while ((
$file = readdir($dh)) !== false) {
        yield
$file;
    }
   
closedir($dh);
}

/**
 * Returns a recursive directory iterator that yields absolute filenames.
 *
 * This iterator is not broken like PHP's built-in DirectoryIterator (which
 * will read the first file from a stream wrapper, then rewind, then read
 * it again).
 *
 * @param string $path Path to traverse (e.g., s3://bucket/key, /tmp)
 * @param resource $context Stream context options.
 *
 * @return \Generator Yields absolute filenames.
 */
function recursive_dir_iterator($path, $context = null)
{
   
$invalid = ['.' => true, '..' => true];
   
$pathLen = strlen($path) + 1;
   
$iterator = dir_iterator($path, $context);
   
$queue = [];
    do {
        while (
$iterator->valid()) {
           
$file = $iterator->current();
           
$iterator->next();
            if (isset(
$invalid[basename($file)])) {
                continue;
            }
           
$fullPath = "{$path}/{$file}";
            yield
$fullPath;
            if (
is_dir($fullPath)) {
               
$queue[] = $iterator;
               
$iterator = map(
                   
dir_iterator($fullPath, $context),
                    function (
$file) use ($fullPath, $pathLen) {
                        return
substr("{$fullPath}/{$file}", $pathLen);
                    }
                );
                continue;
            }
        }
       
$iterator = array_pop($queue);
    } while (
$iterator);
}

//-----------------------------------------------------------------------------
// Misc. functions.
//-----------------------------------------------------------------------------

/**
 * Debug function used to describe the provided value type and class.
 *
 * @param mixed $input
 *
 * @return string Returns a string containing the type of the variable and
 * if a class is provided, the class name.
 */
function describe_type($input)
{
    switch (
gettype($input)) {
        case
'object':
            return
'object(' . get_class($input) . ')';
        case
'array':
            return
'array(' . count($input) . ')';
        default:
           
ob_start();
           
var_dump($input);
           
// normalize float vs double
           
return str_replace('double(', 'float(', rtrim(ob_get_clean()));
    }
}

/**
 * Creates a default HTTP handler based on the available clients.
 *
 * @return callable
 */
function default_http_handler()
{
   
$version = (string) ClientInterface::VERSION;
    if (
$version[0] === '5') {
        return new \
Aws\Handler\GuzzleV5\GuzzleHandler();
    } elseif (
$version[0] === '6') {
        return new \
Aws\Handler\GuzzleV6\GuzzleHandler();
    } else {
        throw new \
RuntimeException('Unknown Guzzle version: ' . $version);
    }
}

/**
 * Serialize a request for a command but do not send it.
 *
 * Returns a promise that is fulfilled with the serialized request.
 *
 * @param CommandInterface $command Command to serialize.
 *
 * @return RequestInterface
 * @throws \RuntimeException
 */
function serialize(CommandInterface $command)
{
   
$request = null;
   
$handlerList = $command->getHandlerList();

   
// Return a mock result.
   
$handlerList->setHandler(
        function (
CommandInterface $_, RequestInterface $r) use (&$request) {
           
$request = $r;
            return new
FulfilledPromise(new Result([]));
        }
    );

   
call_user_func($handlerList->resolve(), $command)->wait();
    if (!
$request instanceof RequestInterface) {
        throw new \
RuntimeException(
           
'Calling handler did not serialize request'
       
);
    }

    return
$request;
}

/**
 * Retrieves data for a service from the SDK's service manifest file.
 *
 * Manifest data is stored statically, so it does not need to be loaded more
 * than once per process. The JSON data is also cached in opcache.
 *
 * @param string $service Case-insensitive namespace or endpoint prefix of the
 * service for which you are retrieving manifest data.
 *
 * @return array
 * @throws \InvalidArgumentException if the service is not supported.
 */
function manifest($service = null)
{
   
// Load the manifest and create aliases for lowercased namespaces
   
static $manifest = [];
    static
$aliases = [];
    if (empty(
$manifest)) {
       
$manifest = load_compiled_json(__DIR__ . '/data/manifest.json');
        foreach (
$manifest as $endpoint => $info) {
           
$alias = strtolower($info['namespace']);
            if (
$alias !== $endpoint) {
               
$aliases[$alias] = $endpoint;
            }
        }
    }

   
// If no service specified, then return the whole manifest.
   
if ($service === null) {
        return
$manifest;
    }

   
// Look up the service's info in the manifest data.
   
$service = strtolower($service);
    if (isset(
$manifest[$service])) {
        return
$manifest[$service] + ['endpoint' => $service];
    } elseif (isset(
$aliases[$service])) {
        return
manifest($aliases[$service]);
    } else {
        throw new \
InvalidArgumentException(
           
"The service \"{$service}\" is not provided by the AWS SDK for PHP."
       
);
    }
}


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