1 files changed, 166 insertions, 0 deletions
diff --git a/vendor/aws/aws-sdk-php/src/Credentials/AssumeRoleWithWebIdentityCredentialProvider.php b/vendor/aws/aws-sdk-php/src/Credentials/AssumeRoleWithWebIdentityCredentialProvider.php
new file mode 100644
index 0000000..7e8057e
--- /dev/null
+++ b/vendor/aws/aws-sdk-php/src/Credentials/AssumeRoleWithWebIdentityCredentialProvider.php
@@ -0,0 +1,166 @@
+<?php
+namespace Aws\Credentials;
+
+use Aws\Exception\AwsException;
+use Aws\Exception\CredentialsException;
+use Aws\Result;
+use Aws\Sts\StsClient;
+use GuzzleHttp\Promise;
+
+/**
+ * Credential provider that provides credentials via assuming a role with a web identity
+ * More Information, see: https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-sts-2011-06-15.html#assumerolewithwebidentity
+ */
+class AssumeRoleWithWebIdentityCredentialProvider
+{
+    const ERROR_MSG = "Missing required 'AssumeRoleWithWebIdentityCredentialProvider' configuration option: ";
+    const ENV_RETRIES = 'AWS_METADATA_SERVICE_NUM_ATTEMPTS';
+
+    /** @var string */
+    private $tokenFile;
+
+    /** @var string */
+    private $arn;
+
+    /** @var string */
+    private $session;
+
+    /** @var StsClient */
+    private $client;
+
+    /** @var integer */
+    private $retries;
+
+    /** @var integer */
+    private $authenticationAttempts;
+
+    /** @var integer */
+    private $tokenFileReadAttempts;
+
+    /**
+     * The constructor attempts to load config from environment variables.
+     * If not set, the following config options are used:
+     *  - WebIdentityTokenFile: full path of token filename
+     *  - RoleArn: arn of role to be assumed
+     *  - SessionName: (optional) set by SDK if not provided
+     *
+     * @param array $config Configuration options
+     * @throws \InvalidArgumentException
+     */
+    public function __construct(array $config = [])
+    {
+        if (!isset($config['RoleArn'])) {
+            throw new \InvalidArgumentException(self::ERROR_MSG . "'RoleArn'.");
+        }
+        $this->arn = $config['RoleArn'];
+
+        if (!isset($config['WebIdentityTokenFile'])) {
+            throw new \InvalidArgumentException(self::ERROR_MSG . "'WebIdentityTokenFile'.");
+        }
+        $this->tokenFile = $config['WebIdentityTokenFile'];
+
+        if (!preg_match("/^\w\:|^\/|^\\\/", $this->tokenFile)) {
+            throw new \InvalidArgumentException("'WebIdentityTokenFile' must be an absolute path.");
+        }
+
+        $this->retries = (int) getenv(self::ENV_RETRIES) ?: (isset($config['retries']) ? $config['retries'] : 3);
+        $this->authenticationAttempts = 0;
+        $this->tokenFileReadAttempts = 0;
+
+        $this->session = isset($config['SessionName'])
+            ? $config['SessionName']
+            : 'aws-sdk-php-' . round(microtime(true) * 1000);
+
+        $region = isset($config['region'])
+            ? $config['region']
+            : 'us-east-1';
+
+        if (isset($config['client'])) {
+            $this->client = $config['client'];
+        } else {
+            $this->client = new StsClient([
+                'credentials' => false,
+                'region' => $region,
+                'version' => 'latest'
+            ]);
+        }
+    }
+
+    /**
+     * Loads assume role with web identity credentials.
+     *
+     * @return Promise\PromiseInterface
+     */
+    public function __invoke()
+    {
+        return Promise\Coroutine::of(function () {
+            $client = $this->client;
+            $result = null;
+            while ($result == null) {
+                try {
+                    $token = @file_get_contents($this->tokenFile);
+                    if (false === $token) {
+                        clearstatcache(true, dirname($this->tokenFile) . "/" . readlink($this->tokenFile));
+                        clearstatcache(true, dirname($this->tokenFile) . "/" . dirname(readlink($this->tokenFile)));
+                        clearstatcache(true, $this->tokenFile);
+                        if (!@is_readable($this->tokenFile)) {
+                            throw new CredentialsException(
+                                "Unreadable tokenfile at location {$this->tokenFile}"
+                            );
+                        }
+
+                        $token = @file_get_contents($this->tokenFile);
+                    }
+                    if (empty($token)) {
+                        if ($this->tokenFileReadAttempts < $this->retries) {
+                            sleep((int) pow(1.2, $this->tokenFileReadAttempts));
+                            $this->tokenFileReadAttempts++;
+                            continue;
+                        }
+                        throw new CredentialsException("InvalidIdentityToken from file: {$this->tokenFile}");
+                    }
+                } catch (\Exception $exception) {
+                    throw new CredentialsException(
+                        "Error reading WebIdentityTokenFile from " . $this->tokenFile,
+                        0,
+                        $exception
+                    );
+                }
+
+                $assumeParams = [
+                    'RoleArn' => $this->arn,
+                    'RoleSessionName' => $this->session,
+                    'WebIdentityToken' => $token
+                ];
+
+                try {
+                    $result = $client->assumeRoleWithWebIdentity($assumeParams);
+                } catch (AwsException $e) {
+                    if ($e->getAwsErrorCode() == 'InvalidIdentityToken') {
+                        if ($this->authenticationAttempts < $this->retries) {
+                            sleep((int) pow(1.2, $this->authenticationAttempts));
+                        } else {
+                            throw new CredentialsException(
+                                "InvalidIdentityToken, retries exhausted"
+                            );
+                        }
+                    } else {
+                        throw new CredentialsException(
+                            "Error assuming role from web identity credentials",
+                            0,
+                            $e
+                        );
+                    }
+                } catch (\Exception $e) {
+                    throw new CredentialsException(
+                        "Error retrieving web identity credentials: " . $e->getMessage()
+                        . " (" . $e->getCode() . ")"
+                    );
+                }
+                $this->authenticationAttempts++;
+            }
+
+            yield $this->client->createCredentials($result);
+        });
+    }
+}