AWS Credentials support, StaticCredentials Provider (#17)

* added credentials API, disabled FFI backend for now

* Added CredentialsTest

* Added support for specifying CMAKE_BUILD_TYPE on the command line

* Added support for AwsCredentials and StaticCredentialsProvider

src/AWS/CRT/Auth/AwsCredentials.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace AWS\CRT\Auth;
+
+use AWS\CRT\NativeResource as NativeResource;
+use AWS\CRT\Options as Options;
+
+/**
+ * Represents a set of AWS credentials
+ *
+ * @param array options:
+ * - string access_key_id - AWS Access Key Id
+ * - string secret_access_key - AWS Secret Access Key
+ * - string session_token - Optional STS session token
+ * - int expiration_timepoint_seconds - Optional time to expire these credentials
+ */
+final class AwsCredentials extends NativeResource {
+
+    static function defaults() {
+        return array(
+            'access_key_id' => '',
+            'secret_access_key' => '',
+            'session_token' => '',
+            'expiration_timepoint_seconds' => 0,
+        );
+    }
+
+    private $access_key_id;
+    private $secret_access_key;
+    private $session_token;
+    private $expiration_timepoint_seconds = 0;
+
+    public function __get($name) {
+        return $this->$name;
+    }
+
+    function __construct($options = []) {
+        parent::__construct();
+        if (count($options) == 0) {
+            $options = self::defaults();
+        }
+        $options = new Options($options);
+        $this->access_key_id = $options->getString('access_key_id');
+        $this->secret_access_key = $options->getString('secret_access_key');
+        $this->session_token = $options->getString('session_token');
+        $this->expiration_timepoint_seconds = $options->getInt('expiration_timepoint_seconds');
+
+        if (strlen($this->access_key_id) == 0) {
+            throw new \InvalidArgumentException("access_key_id must be provided");
+        }
+        if (strlen($this->secret_access_key) == 0) {
+            throw new \InvalidArgumentException("secret_access_key must be provided");
+        }
+
+        $creds_options = self::$crt->aws_credentials_options_new();
+        self::$crt->aws_credentials_options_set_access_key_id($creds_options, $this->access_key_id);
+        self::$crt->aws_credentials_options_set_secret_access_key($creds_options, $this->secret_access_key);
+        self::$crt->aws_credentials_options_set_session_token($creds_options, $this->session_token);
+        self::$crt->aws_credentials_options_set_expiration_timepoint_seconds($creds_options, $this->expiration_timepoint_seconds);
+        $this->acquire(self::$crt->aws_credentials_new($creds_options));
+        self::$crt->aws_credentials_options_release($creds_options);
+    }
+
+    function __destruct() {
+        self::$crt->aws_credentials_release($this->release());
+        parent::__destruct();
+    }
+}

src/AWS/CRT/Auth/CredentialsProvider.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace AWS\CRT\Auth;
+
+use AWS\CRT\NativeResource as NativeResource;
+
+/**
+ * Base class for credentials providers
+ */
+abstract class CredentialsProvider extends NativeResource {
+
+    function __construct(array $options = []) {
+        parent::__construct();
+    }
+
+    function __destruct() {
+        self::$crt->aws_credentials_provider_release($this->release());
+        parent::__destruct();
+    }
+}

src/AWS/CRT/Auth/StaticCredentialsProvider.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace AWS\CRT\Auth;
+
+/**
+ * Provides a static set of AWS credentials
+ *
+ * @param array options:
+ * - string access_key_id - AWS Access Key Id
+ * - string secret_access_key - AWS Secret Access Key
+ * - string session_token - Optional STS session token
+ */
+final class StaticCredentialsProvider extends CredentialsProvider {
+
+    static function defaults() {
+        return array(
+            'access_key_id' => '',
+            'secret_access_key' => '',
+            'session_token' => '',
+        );
+    }
+
+    private $credentials = null;
+
+    public function __get($name) {
+        return $this->$name;
+    }
+
+    function __construct(array $options = []) {
+        parent::__construct();
+        if (count($options) == 0) {
+            $options = self::defaults();
+        }
+        $this->credentials = new AwsCredentials($options);
+
+        $provider_options = self::$crt->aws_credentials_provider_static_options_new();
+        self::$crt->aws_credentials_provider_static_options_set_access_key_id($provider_options, $this->credentials->access_key_id);
+        self::$crt->aws_credentials_provider_static_options_set_secret_access_key($provider_options, $this->credentials->secret_access_key);
+        self::$crt->aws_credentials_provider_static_options_set_session_token($provider_options, $this->credentials->session_token);
+        $this->acquire(self::$crt->aws_credentials_provider_static_new($provider_options));
+        self::$crt->aws_credentials_provider_static_options_release($provider_options);
+    }
+}

src/AWS/CRT/CRT.php

@@ -3,7 +3,6 @@
 namespace AWS\CRT;
 
 use AWS\CRT\Internal\Extension;
-use AWS\CRT\Internal\FFI;
 
 use \RuntimeException;
 
@@ -22,14 +21,6 @@ final class CRT {
         if (is_null(self::$impl)) {
             // Figure out what backends are/should be available
             $backends = ['Extension'];
-            if (version_compare(PHP_VERSION, '7.0.0') >= 0) {
-                $backends = ['Extension', 'FFI'];
-                if (getenv('AWS_CRT_PHP_EXTENSION')) {
-                    $backends = ['Extension'];
-                } else if (getenv('AWS_CRT_PHP_FFI')) {
-                    $backends = ['FFI'];
-                }
-            }
 
             // Try to load each backend, give up if none succeed
             $exceptions = [];
@@ -113,4 +104,67 @@ final class CRT {
     function event_loop_group_release($elg) {
         return self::$impl->aws_crt_event_loop_group_release($elg);
     }
+
+    /**
+     * return object Pointer to native AWS credentials options
+     */
+    function aws_credentials_options_new() {
+        return self::$impl->aws_crt_credentials_options_new();
+    }
+
+    function aws_credentials_options_release($options) {
+        self::$impl->aws_crt_credentials_options_release($options);
+    }
+
+    function aws_credentials_options_set_access_key_id($options, $access_key_id) {
+        self::$impl->aws_crt_credentials_options_set_access_key_id($options, $access_key_id);
+    }
+
+    function aws_credentials_options_set_secret_access_key($options, $secret_access_key) {
+        self::$impl->aws_crt_credentials_options_set_secret_access_key($options, $secret_access_key);
+    }
+
+    function aws_credentials_options_set_session_token($options, $session_token) {
+        self::$impl->aws_crt_credentials_options_set_session_token($options, $session_token);
+    }
+
+    function aws_credentials_options_set_expiration_timepoint_seconds($options, $expiration_timepoint_seconds) {
+        self::$impl->aws_crt_credentials_options_set_expiration_timepoint_seconds($options, $expiration_timepoint_seconds);
+    }
+
+    function aws_credentials_new($options) {
+        return self::$impl->aws_crt_credentials_new($options);
+    }
+
+    function aws_credentials_release($credentials) {
+        self::$impl->aws_crt_credentials_release($credentials);
+    }
+
+    function aws_credentials_provider_release($provider) {
+        self::$impl->aws_crt_credentials_provider_release($provider);
+    }
+
+    function aws_credentials_provider_static_options_new() {
+        return self::$impl->aws_crt_credentials_provider_static_options_new();
+    }
+
+    function aws_credentials_provider_static_options_release($options) {
+        self::$impl->aws_crt_credentials_provider_static_options_release($options);
+    }
+
+    function aws_credentials_provider_static_options_set_access_key_id($options, $access_key_id) {
+        self::$impl->aws_crt_credentials_provider_static_options_set_access_key_id($options, $access_key_id);
+    }
+
+    function aws_credentials_provider_static_options_set_secret_access_key($options, $secret_access_key) {
+        self::$impl->aws_crt_credentials_provider_static_options_set_secret_access_key($options, $secret_access_key);
+    }
+
+    function aws_credentials_provider_static_options_set_session_token($options, $session_token) {
+        self::$impl->aws_crt_credentials_provider_static_options_set_session_token($options, $session_token);
+    }
+
+    function aws_credentials_provider_static_new($options) {
+        return self::$impl->aws_crt_credentials_provider_static_new($options);
+    }
 }

src/AWS/CRT/IO/EventLoopGroup.php

@@ -3,6 +3,7 @@
 namespace AWS\CRT\IO;
 
 use AWS\CRT\NativeResource as NativeResource;
+use AWS\CRT\Options as Options;
 
 /**
  * Represents 1 or more event loops (1 per thread) for doing I/O and background tasks.
@@ -19,13 +20,14 @@ final class EventLoopGroup extends NativeResource {
         );
     }
 
-    function __construct(array $options = array()) {
+    function __construct(array $options = []) {
         parent::__construct();
         if (count($options) == 0) {
             $options = self::defaults();
         }
+        $options = new Options($options);
         $elg_options = self::$crt->event_loop_group_options_new();
-        self::$crt->event_loop_group_options_set_max_threads($elg_options, $options['max_threads']);
+        self::$crt->event_loop_group_options_set_max_threads($elg_options, $options->getInt('max_threads'));
         $this->acquire(self::$crt->event_loop_group_new($elg_options));
         self::$crt->event_loop_group_options_release($elg_options);
     }

src/AWS/CRT/Internal/FFI.php

@@ -1,51 +0,0 @@
-<?php
-
-namespace AWS\CRT\Internal;
-
-use \Exception;
-use \RuntimeException;
-
-/**
- * @internal
- * Forwards calls on to libaws-crt-ffi via FFI
- */
-final class FFI {
-    private static $ffi = null;
-    private static $refcount = 0;
-
-    function __construct() {
-        if (is_null(self::$ffi)) {
-            try {
-                self::$ffi = \FFI::cdef(file_get_contents(__DIR__ . "/../../../api.h"), __DIR__ . "/../../../libaws-crt-ffi.so");
-                self::init();
-            } catch (Exception $e) {
-                throw new RuntimeException('Exception while initializing CRT via FFI', 0, $e);
-            }
-        }
-        ++self::$refcount;
-    }
-
-    function __destruct() {
-        if (--self::$refcount == 0) {
-            self::clean_up();
-            self::$ffi = null;
-        }
-    }
-
-    /**
-     * Forwards any call made on this object to the FFI function of the
-     * same name with the supplied arguments. Argument type hinting and checking
-     * occurs at the CRT wrapper.
-     */
-    function __call(string $name, $args) {
-        return call_user_func_array(array(self::$ffi, $name), $args);
-    }
-
-    private static function init() {
-        return self::$ffi->aws_crt_init();
-    }
-
-    private static function clean_up() {
-        return self::$ffi->aws_crt_clean_up();
-    }
-}

src/AWS/CRT/Options.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace AWS\CRT;
+
+final class Options {
+    private $options = [];
+
+    public function __construct($opts = []) {
+        $this->options = $opts;
+    }
+
+    public function __get($name) {
+        return (isset($this->options[$name])) ? $this->options[$name] : null;
+    }
+
+    public function asArray() {
+        return $this->options;
+    }
+
+    public function toArray() {
+        return array_merge_recursive([], $this->options);
+    }
+
+    public function getInt($name) {
+        $val = $this->$name;
+        return (is_null($val)) ? 0 : (int)$val;
+    }
+
+    public function getString($name) {
+        return !empty($this->options[$name]) ? strval($this->options[$name]) : "";
+    }
+}