chore(release): 1.5.3

chore: update package.json test to use linter (#132 )
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
2026-08-25 04:35:06 +09:00 · 2020-10-05 17:23:01 +00:00 · 2020-09-29 15:46:28 +00:00 · 2020-09-29 06:13:09 +00:00 · 2020-09-29 06:12:25 +00:00 · 2020-09-29 05:05:01 +00:00
14 changed files with 3875 additions and 1858 deletions
@@ -1,9 +0,0 @@
-version: 1
-update_configs:
-  - package_manager: "javascript"
-    directory: "/"
-    update_schedule: "monthly"
-    automerged_updates:
-      - match:
-          dependency_type: "all"
-          update_type: "semver:minor"
@@ -0,0 +1,8 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: weekly
+    day: tuesday
+  open-pull-requests-limit: 10
@@ -12,17 +12,18 @@ pull_request_rules:
      - -merged
      - -closed
      - author!=dependabot[bot]
-      - author!=dependabot-preview[bot]
    actions:
      merge:
        method: squash
        strict: smart
        strict_method: merge

-  - name: Automatically approve Dependabot PRs
+  - name: Automatically approve and merge Dependabot PRs
    conditions:
      - base=master
-      - author~=^dependabot(|-preview)\[bot\]$
+      - author=dependabot[bot]
+      - status-success=Run Unit Tests
+      - status-success=Semantic Pull Request
      - -title~=(WIP|wip)
      - -label~=(blocked|do-not-merge)
      - -merged
@@ -30,3 +31,7 @@ pull_request_rules:
    actions:
      review:
        type: APPROVE
+      merge:
+        method: squash
+        strict: smart+fasttrack
+        strict_method: merge
@@ -2,6 +2,86 @@

 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.

+### [1.5.3](https://github.com/aws-actions/configure-aws-credentials/compare/v1.5.2...v1.5.3) (2020-10-05)
+
+### [1.5.2](https://github.com/aws-actions/configure-aws-credentials/compare/v1.5.1...v1.5.2) (2020-08-25)
+
+### [1.5.1](https://github.com/aws-actions/configure-aws-credentials/compare/v1.5.0...v1.5.1) (2020-08-11)
+
+
+### Bug Fixes
+
+* make GITHUB_REF env var optional ([#82](https://github.com/aws-actions/configure-aws-credentials/issues/82)) ([ba5041f](https://github.com/aws-actions/configure-aws-credentials/commit/ba5041f7bb4990ac5d10d9009de69e639ebee3df)), closes [#92](https://github.com/aws-actions/configure-aws-credentials/issues/92)
+
+## [1.5.0](https://github.com/aws-actions/configure-aws-credentials/compare/v1.4.4...v1.5.0) (2020-07-29)
+
+
+### Features
+
+* Add post-job action cleanup of credentials and region env vars ([#101](https://github.com/aws-actions/configure-aws-credentials/issues/101)) ([d19cafc](https://github.com/aws-actions/configure-aws-credentials/commit/d19cafcdd1be7e3358f84574a00df37af494036a))
+
+
+### Bug Fixes
+
+* Mask assume role response in debug output ([#102](https://github.com/aws-actions/configure-aws-credentials/issues/102)) ([df7d846](https://github.com/aws-actions/configure-aws-credentials/commit/df7d84616183de7ed37e53e1980284a07e56b216))
+
+### [1.4.4](https://github.com/aws-actions/configure-aws-credentials/compare/v1.4.3...v1.4.4) (2020-07-17)
+
+### [1.4.3](https://github.com/aws-actions/configure-aws-credentials/compare/v1.4.2...v1.4.3) (2020-07-14)
+
+
+### Bug Fixes
+
+* Make tagging optional ([#92](https://github.com/aws-actions/configure-aws-credentials/issues/92)) ([baf85d8](https://github.com/aws-actions/configure-aws-credentials/commit/baf85d8be969f190df9bc9153f06958c32ef3828))
+
+### [1.4.2](https://github.com/aws-actions/configure-aws-credentials/compare/v1.4.1...v1.4.2) (2020-06-30)
+
+
+### Bug Fixes
+
+* add comma to set of special characters ([#78](https://github.com/aws-actions/configure-aws-credentials/issues/78)) ([f04843b](https://github.com/aws-actions/configure-aws-credentials/commit/f04843b510a6c8adf77eed907a616cf00a99970d))
+
+### [1.4.1](https://github.com/aws-actions/configure-aws-credentials/compare/v1.4.0...v1.4.1) (2020-06-09)
+
+## [1.4.0](https://github.com/aws-actions/configure-aws-credentials/compare/v1.3.5...v1.4.0) (2020-06-03)
+
+
+### Features
+
+* Refresh and validate credentials after setting env var creds ([#71](https://github.com/aws-actions/configure-aws-credentials/issues/71)) ([472e549](https://github.com/aws-actions/configure-aws-credentials/commit/472e549195ba1f153e9fb72e39dc2a094e5de13e))
+
+### [1.3.5](https://github.com/aws-actions/configure-aws-credentials/compare/v1.3.4...v1.3.5) (2020-05-27)
+
+
+### Bug Fixes
+
+* clear session token env var if present for non-session credentials ([#65](https://github.com/aws-actions/configure-aws-credentials/issues/65)) ([0c2c1f7](https://github.com/aws-actions/configure-aws-credentials/commit/0c2c1f7c129971b6f433551b1f4ba4a6a9cc8b70))
+
+### [1.3.4](https://github.com/aws-actions/configure-aws-credentials/compare/v1.3.3...v1.3.4) (2020-05-18)
+
+### [1.3.3](https://github.com/aws-actions/configure-aws-credentials/compare/v1.3.2...v1.3.3) (2020-04-02)
+
+### [1.3.2](https://github.com/aws-actions/configure-aws-credentials/compare/v1.3.1...v1.3.2) (2020-03-18)
+
+
+### Bug Fixes
+
+* let the AWS SDK determine the STS regional endpoint ([#48](https://github.com/aws-actions/configure-aws-credentials/issues/48)) ([fc72bd3](https://github.com/aws-actions/configure-aws-credentials/commit/fc72bd38dbe25493f5113760c9c6e1ef2f6f9a0e))
+
+### [1.3.1](https://github.com/aws-actions/configure-aws-credentials/compare/v1.3.0...v1.3.1) (2020-03-06)
+
+
+### Bug Fixes
+
+* validate region input string ([#44](https://github.com/aws-actions/configure-aws-credentials/issues/44)) ([3d568d2](https://github.com/aws-actions/configure-aws-credentials/commit/3d568d2c4359304d46d9bd1b4d9f69e088ccbf7b))
+
+## [1.3.0](https://github.com/aws-actions/configure-aws-credentials/compare/v1.2.0...v1.3.0) (2020-03-06)
+
+
+### Features
+
+* don't require access key credentials for self-hosted runners ([#42](https://github.com/aws-actions/configure-aws-credentials/issues/42)) ([a20ed60](https://github.com/aws-actions/configure-aws-credentials/commit/a20ed6025224ca999786c8d4e687f119cfedec65))
+
 ## [1.2.0](https://github.com/aws-actions/configure-aws-credentials/compare/v1.1.2...v1.2.0) (2020-03-06)


@@ -2,6 +2,21 @@

 Configure AWS credential and region environment variables for use in other GitHub Actions.  The environment variables will be detected by both the AWS SDKs and the AWS CLI to determine the credentials and region to use for AWS API calls.

+**Table of Contents**
+
+<!-- toc -->
+
+- [Usage](#usage)
+- [Credentials](#credentials)
+- [Assuming a Role](#assuming-a-role)
+    + [Permissions for assuming a role](#permissions-for-assuming-a-role)
+    + [Session tagging](#session-tagging)
+- [Self-Hosted Runners](#self-hosted-runners)
+- [License Summary](#license-summary)
+- [Security Disclosures](#security-disclosures)
+
+<!-- tocstop -->
+
 ## Usage

 Add the following step to your workflow:
@@ -16,8 +31,9 @@ Add the following step to your workflow:
 ```

 For example, you can use this action with the AWS CLI available in [GitHub's hosted virtual environments](https://help.github.com/en/actions/reference/software-installed-on-github-hosted-runners).
+You can also run this action multiple times to use different AWS accounts, regions, or IAM roles in the same GitHub Actions workflow job.

-```
+```yaml
 jobs:
  deploy:
    name: Upload to Amazon S3
@@ -27,16 +43,27 @@ jobs:
    - name: Checkout
      uses: actions/checkout@v2

-    - name: Configure AWS credentials
+    - name: Configure AWS credentials from Test account
      uses: aws-actions/configure-aws-credentials@v1
      with:
-        aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
-        aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
-        aws-region: us-east-2
+        aws-access-key-id: ${{ secrets.TEST_AWS_ACCESS_KEY_ID }}
+        aws-secret-access-key: ${{ secrets.TEST_AWS_SECRET_ACCESS_KEY }}
+        aws-region: us-east-1

-    - name: Copy files to S3 with the AWS CLI
+    - name: Copy files to the test website with the AWS CLI
      run: |
-        aws s3 sync . s3://my-s3-website-bucket
+        aws s3 sync . s3://my-s3-test-website-bucket
+
+    - name: Configure AWS credentials from Production account
+      uses: aws-actions/configure-aws-credentials@v1
+      with:
+        aws-access-key-id: ${{ secrets.PROD_AWS_ACCESS_KEY_ID }}
+        aws-secret-access-key: ${{ secrets.PROD_AWS_SECRET_ACCESS_KEY }}
+        aws-region: us-west-2
+
+    - name: Copy files to the production website with the AWS CLI
+      run: |
+        aws s3 sync . s3://my-s3-prod-website-bucket
 ```

 See [action.yml](action.yml) for the full documentation for this action's inputs and outputs.
@@ -50,7 +77,7 @@ We recommend following [Amazon IAM best practices](https://docs.aws.amazon.com/I
 * [Rotate the credentials](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#rotate-credentials) used in GitHub Actions workflows regularly.
 * [Monitor the activity](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#keep-a-log) of the credentials used in GitHub Actions workflows.

-## Assuming a role
+## Assuming a Role
 If you would like to use the static credentials you provide to this action to assume a role, you can do so by specifying the role ARN in `role-to-assume`.
 The role credentials will then be configured in the Actions environment instead of the static credentials you have provided.
 The default session duration is 6 hours, but if you would like to adjust this you can pass a duration to `role-duration-seconds`.
@@ -71,10 +98,10 @@ Example:
 ```
 In this example, the secret `AWS_ROLE_TO_ASSUME` contains a string like `arn:aws:iam::123456789100:role/my-github-actions-role`.  To assume a role in the same account as the static credentials, you can simply specify the role name, like `role-to-assume: my-github-actions-role`.

-### Permissions
+### Permissions for assuming a role

 In order to assume a role, the IAM user for the static credentials must have the following permissions:
-```
+```json
 {
    "Version": "2012-10-17",
    "Statement": [
@@ -91,7 +118,7 @@ In order to assume a role, the IAM user for the static credentials must have the
 ```

 The role's trust policy must allow the IAM user to assume the role:
-```
+```json
 {
    "Version": "2012-10-17",
    "Statement": [
@@ -130,6 +157,41 @@ The session will have the name "GitHubActions" and be tagged with the following

 _Note: all tag values must conform to [the requirements](https://docs.aws.amazon.com/STS/latest/APIReference/API_Tag.html). Particularly, `GITHUB_WORKFLOW` will be truncated if it's too long. If `GITHUB_ACTOR` or `GITHUB_WORKFLOW` contain invalid charcters, the characters will be replaced with an '*'._

+The action will use session tagging by default during role assumption. You can skip this session tagging by providing `role-skip-session-tagging` as true in the action's inputs:
+
+```yaml
+      uses: aws-actions/configure-aws-credentials@v1
+      with:
+        role-skip-session-tagging: true
+```
+
+## Self-Hosted Runners
+
+If you run your GitHub Actions in a [self-hosted runner](https://help.github.com/en/actions/hosting-your-own-runners/about-self-hosted-runners) that already has access to AWS credentials, such as an EC2 instance, then you do not need to provide IAM user access key credentials to this action.
+
+If no access key credentials are given in the action inputs, this action will use credentials from the runner environment using the [default methods for the AWS SDK for Javascript](https://docs.aws.amazon.com/sdk-for-javascript/v2/developer-guide/setting-credentials-node.html).
+
+You can use this action to simply configure the region and account ID in the environment, and then use the runner's credentials for all AWS API calls made by your Actions workflow:
+```yaml
+uses: aws-actions/configure-aws-credentials@v1
+with:
+  aws-region: us-east-2
+```
+In this case, your runner's credentials must have permissions to call any AWS APIs called by your Actions workflow.
+
+Or, you can use this action to assume a role, and then use the role credentials for all AWS API calls made by your Actions workflow:
+```yaml
+uses: aws-actions/configure-aws-credentials@v1
+with:
+  aws-region: us-east-2
+  role-to-assume: my-github-actions-role
+```
+In this case, your runner's credentials must have permissions to assume the role.
+
 ## License Summary

 This code is made available under the MIT license.
+
+## Security Disclosures
+
+If you would like to report a potential security issue in this project, please do not create a GitHub issue.  Instead, please follow the instructions [here](https://aws.amazon.com/security/vulnerability-reporting/) or [email AWS security directly](mailto:aws-security@amazon.com).
@@ -5,11 +5,17 @@ branding:
  color: 'orange'
 inputs:
  aws-access-key-id:
-    description: 'AWS Access Key ID'
-    required: true
+    description: >-
+      AWS Access Key ID. This input is required if running in the GitHub hosted environment.
+      It is optional if running in a self-hosted environment that already has AWS credentials,
+      for example on an EC2 instance.
+    required: false
  aws-secret-access-key:
-    description: 'AWS Secret Access Key'
-    required: true
+    description: >-
+      AWS Secret Access Key. This input is required if running in the GitHub hosted environment.
+      It is optional if running in a self-hosted environment that already has AWS credentials,
+      for example on an EC2 instance.
+    required: false
  aws-session-token:
    description: 'AWS Session Token'
    required: false
@@ -37,9 +43,13 @@ inputs:
  role-external-id:
    description: 'The external ID of the role to assume'
    required: false
+  role-skip-session-tagging:
+    description: 'Skip session tagging during role assumption'
+    required: false
 outputs:
  aws-account-id:
    description: 'The AWS account ID for the provided credentials'
 runs:
  using: 'node12'
  main: 'dist/index.js'
+  post: 'dist/cleanup/index.js'
@@ -0,0 +1,36 @@
+const core = require('@actions/core');
+
+/**
+ * When the GitHub Actions job is done, clean up any environment variables that
+ * may have been set by the configure-aws-credentials steps in the job.
+ *
+ * Environment variables are not intended to be shared across different jobs in
+ * the same GitHub Actions workflow: GitHub Actions documentation states that
+ * each job runs in a fresh instance.  However, doing our own cleanup will
+ * give us additional assurance that these environment variables are not shared
+ * with any other jobs.
+ */
+
+async function cleanup() {
+  try {
+    // The GitHub Actions toolkit does not have an option to completely unset
+    // environment variables, so we overwrite the current value with an empty
+    // string. The AWS CLI and AWS SDKs will behave correctly: they treat an
+    // empty string value as if the environment variable does not exist.
+    core.exportVariable('AWS_ACCESS_KEY_ID', '');
+    core.exportVariable('AWS_SECRET_ACCESS_KEY', '');
+    core.exportVariable('AWS_SESSION_TOKEN', '');
+    core.exportVariable('AWS_DEFAULT_REGION', '');
+    core.exportVariable('AWS_REGION', '');
+  }
+  catch (error) {
+    core.setFailed(error.message);
+  }
+}
+
+module.exports = cleanup;
+
+/* istanbul ignore next */
+if (require.main === module) {
+  cleanup();
+}
@@ -0,0 +1,51 @@
+const core = require('@actions/core');
+const cleanup = require('./cleanup.js');
+
+jest.mock('@actions/core');
+
+const FAKE_ACCESS_KEY_ID = 'MY-AWS-ACCESS-KEY-ID';
+const FAKE_SECRET_ACCESS_KEY = 'MY-AWS-SECRET-ACCESS-KEY';
+const FAKE_SESSION_TOKEN = 'MY-AWS-SESSION-TOKEN';
+const FAKE_REGION = 'fake-region-1';
+const ACTION_ENVIRONMENT_VARIABLES = {
+    AWS_ACCESS_KEY_ID: FAKE_ACCESS_KEY_ID,
+    AWS_SECRET_ACCESS_KEY: FAKE_SECRET_ACCESS_KEY,
+    AWS_SESSION_TOKEN: FAKE_SESSION_TOKEN,
+    AWS_DEFAULT_REGION: FAKE_REGION,
+    AWS_REGION: FAKE_REGION,
+};
+
+describe('Configure AWS Credentials', () => {
+    const OLD_ENV = process.env;
+
+    beforeEach(() => {
+        jest.resetModules();
+        process.env = {...OLD_ENV, ...ACTION_ENVIRONMENT_VARIABLES};
+    });
+
+    afterEach(() => {
+        process.env = OLD_ENV;
+    });
+
+    test('replaces AWS credential and region env vars with empty strings', async () => {
+        await cleanup();
+        expect(core.setFailed).toHaveBeenCalledTimes(0);
+        expect(core.exportVariable).toHaveBeenCalledTimes(5);
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_ACCESS_KEY_ID', '');
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_SECRET_ACCESS_KEY', '');
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_SESSION_TOKEN', '');
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_DEFAULT_REGION', '');
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_REGION', '');
+    });
+
+    test('error is caught and fails the action', async () => {
+        core.exportVariable.mockReset();
+        core.exportVariable.mockImplementation(() => {
+            throw new Error();
+        });
+
+        await cleanup();
+
+        expect(core.setFailed).toBeCalled();
+    });
+});
@@ -0,0 +1,509 @@
+module.exports =
+/******/ (function(modules, runtime) { // webpackBootstrap
+/******/ 	"use strict";
+/******/ 	// The module cache
+/******/ 	var installedModules = {};
+/******/
+/******/ 	// The require function
+/******/ 	function __webpack_require__(moduleId) {
+/******/
+/******/ 		// Check if module is in cache
+/******/ 		if(installedModules[moduleId]) {
+/******/ 			return installedModules[moduleId].exports;
+/******/ 		}
+/******/ 		// Create a new module (and put it into the cache)
+/******/ 		var module = installedModules[moduleId] = {
+/******/ 			i: moduleId,
+/******/ 			l: false,
+/******/ 			exports: {}
+/******/ 		};
+/******/
+/******/ 		// Execute the module function
+/******/ 		var threw = true;
+/******/ 		try {
+/******/ 			modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
+/******/ 			threw = false;
+/******/ 		} finally {
+/******/ 			if(threw) delete installedModules[moduleId];
+/******/ 		}
+/******/
+/******/ 		// Flag the module as loaded
+/******/ 		module.l = true;
+/******/
+/******/ 		// Return the exports of the module
+/******/ 		return module.exports;
+/******/ 	}
+/******/
+/******/
+/******/ 	__webpack_require__.ab = __dirname + "/";
+/******/
+/******/ 	// the startup function
+/******/ 	function startup() {
+/******/ 		// Load entry module and return exports
+/******/ 		return __webpack_require__(175);
+/******/ 	};
+/******/
+/******/ 	// run startup
+/******/ 	return startup();
+/******/ })
+/************************************************************************/
+/******/ ({
+
+/***/ 82:
+/***/ (function(__unusedmodule, exports) {
+
+"use strict";
+
+// We use any as a valid input type
+/* eslint-disable @typescript-eslint/no-explicit-any */
+Object.defineProperty(exports, "__esModule", { value: true });
+/**
+ * Sanitizes an input into a string so it can be passed into issueCommand safely
+ * @param input input to sanitize into a string
+ */
+function toCommandValue(input) {
+    if (input === null || input === undefined) {
+        return '';
+    }
+    else if (typeof input === 'string' || input instanceof String) {
+        return input;
+    }
+    return JSON.stringify(input);
+}
+exports.toCommandValue = toCommandValue;
+//# sourceMappingURL=utils.js.map
+
+/***/ }),
+
+/***/ 87:
+/***/ (function(module) {
+
+module.exports = require("os");
+
+/***/ }),
+
+/***/ 102:
+/***/ (function(__unusedmodule, exports, __webpack_require__) {
+
+"use strict";
+
+// For internal use, subject to change.
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+// We use any as a valid input type
+/* eslint-disable @typescript-eslint/no-explicit-any */
+const fs = __importStar(__webpack_require__(747));
+const os = __importStar(__webpack_require__(87));
+const utils_1 = __webpack_require__(82);
+function issueCommand(command, message) {
+    const filePath = process.env[`GITHUB_${command}`];
+    if (!filePath) {
+        throw new Error(`Unable to find environment variable for file command ${command}`);
+    }
+    if (!fs.existsSync(filePath)) {
+        throw new Error(`Missing file at path: ${filePath}`);
+    }
+    fs.appendFileSync(filePath, `${utils_1.toCommandValue(message)}${os.EOL}`, {
+        encoding: 'utf8'
+    });
+}
+exports.issueCommand = issueCommand;
+//# sourceMappingURL=file-command.js.map
+
+/***/ }),
+
+/***/ 175:
+/***/ (function(module, __unusedexports, __webpack_require__) {
+
+const core = __webpack_require__(470);
+
+/**
+ * When the GitHub Actions job is done, clean up any environment variables that
+ * may have been set by the configure-aws-credentials steps in the job.
+ *
+ * Environment variables are not intended to be shared across different jobs in
+ * the same GitHub Actions workflow: GitHub Actions documentation states that
+ * each job runs in a fresh instance.  However, doing our own cleanup will
+ * give us additional assurance that these environment variables are not shared
+ * with any other jobs.
+ */
+
+async function cleanup() {
+  try {
+    // The GitHub Actions toolkit does not have an option to completely unset
+    // environment variables, so we overwrite the current value with an empty
+    // string. The AWS CLI and AWS SDKs will behave correctly: they treat an
+    // empty string value as if the environment variable does not exist.
+    core.exportVariable('AWS_ACCESS_KEY_ID', '');
+    core.exportVariable('AWS_SECRET_ACCESS_KEY', '');
+    core.exportVariable('AWS_SESSION_TOKEN', '');
+    core.exportVariable('AWS_DEFAULT_REGION', '');
+    core.exportVariable('AWS_REGION', '');
+  }
+  catch (error) {
+    core.setFailed(error.message);
+  }
+}
+
+module.exports = cleanup;
+
+/* istanbul ignore next */
+if (require.main === require.cache[eval('__filename')]) {
+  cleanup();
+}
+
+
+/***/ }),
+
+/***/ 431:
+/***/ (function(__unusedmodule, exports, __webpack_require__) {
+
+"use strict";
+
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const os = __importStar(__webpack_require__(87));
+const utils_1 = __webpack_require__(82);
+/**
+ * Commands
+ *
+ * Command Format:
+ *   ::name key=value,key=value::message
+ *
+ * Examples:
+ *   ::warning::This is the message
+ *   ::set-env name=MY_VAR::some value
+ */
+function issueCommand(command, properties, message) {
+    const cmd = new Command(command, properties, message);
+    process.stdout.write(cmd.toString() + os.EOL);
+}
+exports.issueCommand = issueCommand;
+function issue(name, message = '') {
+    issueCommand(name, {}, message);
+}
+exports.issue = issue;
+const CMD_STRING = '::';
+class Command {
+    constructor(command, properties, message) {
+        if (!command) {
+            command = 'missing.command';
+        }
+        this.command = command;
+        this.properties = properties;
+        this.message = message;
+    }
+    toString() {
+        let cmdStr = CMD_STRING + this.command;
+        if (this.properties && Object.keys(this.properties).length > 0) {
+            cmdStr += ' ';
+            let first = true;
+            for (const key in this.properties) {
+                if (this.properties.hasOwnProperty(key)) {
+                    const val = this.properties[key];
+                    if (val) {
+                        if (first) {
+                            first = false;
+                        }
+                        else {
+                            cmdStr += ',';
+                        }
+                        cmdStr += `${key}=${escapeProperty(val)}`;
+                    }
+                }
+            }
+        }
+        cmdStr += `${CMD_STRING}${escapeData(this.message)}`;
+        return cmdStr;
+    }
+}
+function escapeData(s) {
+    return utils_1.toCommandValue(s)
+        .replace(/%/g, '%25')
+        .replace(/\r/g, '%0D')
+        .replace(/\n/g, '%0A');
+}
+function escapeProperty(s) {
+    return utils_1.toCommandValue(s)
+        .replace(/%/g, '%25')
+        .replace(/\r/g, '%0D')
+        .replace(/\n/g, '%0A')
+        .replace(/:/g, '%3A')
+        .replace(/,/g, '%2C');
+}
+//# sourceMappingURL=command.js.map
+
+/***/ }),
+
+/***/ 470:
+/***/ (function(__unusedmodule, exports, __webpack_require__) {
+
+"use strict";
+
+var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
+    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
+    return new (P || (P = Promise))(function (resolve, reject) {
+        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
+        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
+        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
+    });
+};
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const command_1 = __webpack_require__(431);
+const file_command_1 = __webpack_require__(102);
+const utils_1 = __webpack_require__(82);
+const os = __importStar(__webpack_require__(87));
+const path = __importStar(__webpack_require__(622));
+/**
+ * The code to exit an action
+ */
+var ExitCode;
+(function (ExitCode) {
+    /**
+     * A code indicating that the action was successful
+     */
+    ExitCode[ExitCode["Success"] = 0] = "Success";
+    /**
+     * A code indicating that the action was a failure
+     */
+    ExitCode[ExitCode["Failure"] = 1] = "Failure";
+})(ExitCode = exports.ExitCode || (exports.ExitCode = {}));
+//-----------------------------------------------------------------------
+// Variables
+//-----------------------------------------------------------------------
+/**
+ * Sets env variable for this action and future actions in the job
+ * @param name the name of the variable to set
+ * @param val the value of the variable. Non-string values will be converted to a string via JSON.stringify
+ */
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function exportVariable(name, val) {
+    const convertedVal = utils_1.toCommandValue(val);
+    process.env[name] = convertedVal;
+    const filePath = process.env['GITHUB_ENV'] || '';
+    if (filePath) {
+        const delimiter = '_GitHubActionsFileCommandDelimeter_';
+        const commandValue = `${name}<<${delimiter}${os.EOL}${convertedVal}${os.EOL}${delimiter}`;
+        file_command_1.issueCommand('ENV', commandValue);
+    }
+    else {
+        command_1.issueCommand('set-env', { name }, convertedVal);
+    }
+}
+exports.exportVariable = exportVariable;
+/**
+ * Registers a secret which will get masked from logs
+ * @param secret value of the secret
+ */
+function setSecret(secret) {
+    command_1.issueCommand('add-mask', {}, secret);
+}
+exports.setSecret = setSecret;
+/**
+ * Prepends inputPath to the PATH (for this action and future actions)
+ * @param inputPath
+ */
+function addPath(inputPath) {
+    const filePath = process.env['GITHUB_PATH'] || '';
+    if (filePath) {
+        file_command_1.issueCommand('PATH', inputPath);
+    }
+    else {
+        command_1.issueCommand('add-path', {}, inputPath);
+    }
+    process.env['PATH'] = `${inputPath}${path.delimiter}${process.env['PATH']}`;
+}
+exports.addPath = addPath;
+/**
+ * Gets the value of an input.  The value is also trimmed.
+ *
+ * @param     name     name of the input to get
+ * @param     options  optional. See InputOptions.
+ * @returns   string
+ */
+function getInput(name, options) {
+    const val = process.env[`INPUT_${name.replace(/ /g, '_').toUpperCase()}`] || '';
+    if (options && options.required && !val) {
+        throw new Error(`Input required and not supplied: ${name}`);
+    }
+    return val.trim();
+}
+exports.getInput = getInput;
+/**
+ * Sets the value of an output.
+ *
+ * @param     name     name of the output to set
+ * @param     value    value to store. Non-string values will be converted to a string via JSON.stringify
+ */
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function setOutput(name, value) {
+    command_1.issueCommand('set-output', { name }, value);
+}
+exports.setOutput = setOutput;
+/**
+ * Enables or disables the echoing of commands into stdout for the rest of the step.
+ * Echoing is disabled by default if ACTIONS_STEP_DEBUG is not set.
+ *
+ */
+function setCommandEcho(enabled) {
+    command_1.issue('echo', enabled ? 'on' : 'off');
+}
+exports.setCommandEcho = setCommandEcho;
+//-----------------------------------------------------------------------
+// Results
+//-----------------------------------------------------------------------
+/**
+ * Sets the action status to failed.
+ * When the action exits it will be with an exit code of 1
+ * @param message add error issue message
+ */
+function setFailed(message) {
+    process.exitCode = ExitCode.Failure;
+    error(message);
+}
+exports.setFailed = setFailed;
+//-----------------------------------------------------------------------
+// Logging Commands
+//-----------------------------------------------------------------------
+/**
+ * Gets whether Actions Step Debug is on or not
+ */
+function isDebug() {
+    return process.env['RUNNER_DEBUG'] === '1';
+}
+exports.isDebug = isDebug;
+/**
+ * Writes debug message to user log
+ * @param message debug message
+ */
+function debug(message) {
+    command_1.issueCommand('debug', {}, message);
+}
+exports.debug = debug;
+/**
+ * Adds an error issue
+ * @param message error issue message. Errors will be converted to string via toString()
+ */
+function error(message) {
+    command_1.issue('error', message instanceof Error ? message.toString() : message);
+}
+exports.error = error;
+/**
+ * Adds an warning issue
+ * @param message warning issue message. Errors will be converted to string via toString()
+ */
+function warning(message) {
+    command_1.issue('warning', message instanceof Error ? message.toString() : message);
+}
+exports.warning = warning;
+/**
+ * Writes info to log with console.log.
+ * @param message info message
+ */
+function info(message) {
+    process.stdout.write(message + os.EOL);
+}
+exports.info = info;
+/**
+ * Begin an output group.
+ *
+ * Output until the next `groupEnd` will be foldable in this group
+ *
+ * @param name The name of the output group
+ */
+function startGroup(name) {
+    command_1.issue('group', name);
+}
+exports.startGroup = startGroup;
+/**
+ * End an output group.
+ */
+function endGroup() {
+    command_1.issue('endgroup');
+}
+exports.endGroup = endGroup;
+/**
+ * Wrap an asynchronous function call in a group.
+ *
+ * Returns the same type as the function itself.
+ *
+ * @param name The name of the group
+ * @param fn The function to wrap in the group
+ */
+function group(name, fn) {
+    return __awaiter(this, void 0, void 0, function* () {
+        startGroup(name);
+        let result;
+        try {
+            result = yield fn();
+        }
+        finally {
+            endGroup();
+        }
+        return result;
+    });
+}
+exports.group = group;
+//-----------------------------------------------------------------------
+// Wrapper action state
+//-----------------------------------------------------------------------
+/**
+ * Saves state for current action, the state can only be retrieved by this action's post job execution.
+ *
+ * @param     name     name of the state to store
+ * @param     value    value to store. Non-string values will be converted to a string via JSON.stringify
+ */
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function saveState(name, value) {
+    command_1.issueCommand('save-state', { name }, value);
+}
+exports.saveState = saveState;
+/**
+ * Gets the value of an state set by this action's main execution.
+ *
+ * @param     name     name of the state to get
+ * @returns   string
+ */
+function getState(name) {
+    return process.env[`STATE_${name}`] || '';
+}
+exports.getState = getState;
+//# sourceMappingURL=core.js.map
+
+/***/ }),
+
+/***/ 622:
+/***/ (function(module) {
+
+module.exports = require("path");
+
+/***/ }),
+
+/***/ 747:
+/***/ (function(module) {
+
+module.exports = require("fs");
+
+/***/ })
+
+/******/ });
@@ -1,7 +1,6 @@
 const core = require('@actions/core');
 const aws = require('aws-sdk');
 const assert = require('assert');
-const util = require('util');

 // The max time that a GitHub action is allowed to run is 6 hours.
 // That seems like a reasonable default to use if no role duration is defined.
@@ -10,6 +9,7 @@ const USER_AGENT = 'configure-aws-credentials-for-github-actions';
 const MAX_TAG_VALUE_LENGTH = 256;
 const SANITIZATION_CHARACTER = '_';
 const ROLE_SESSION_NAME = 'GitHubActions';
+const REGION_REGEX = /^[a-z0-9-]+$/g;

 async function assumeRole(params) {
  // Assume a role to get short-lived credentials using longer-lived credentials.
@@ -22,15 +22,16 @@ async function assumeRole(params) {
    roleDurationSeconds,
    roleSessionName,
    region,
+    roleSkipSessionTagging
  } = params;
  assert(
      [sourceAccountId, roleToAssume, roleDurationSeconds, roleSessionName, region].every(isDefined),
      "Missing required input when assuming a Role."
  );

-  const {GITHUB_REPOSITORY, GITHUB_WORKFLOW, GITHUB_ACTION, GITHUB_ACTOR, GITHUB_REF, GITHUB_SHA} = process.env;
+  const {GITHUB_REPOSITORY, GITHUB_WORKFLOW, GITHUB_ACTION, GITHUB_ACTOR, GITHUB_SHA} = process.env;
  assert(
-      [GITHUB_REPOSITORY, GITHUB_WORKFLOW, GITHUB_ACTION, GITHUB_ACTOR, GITHUB_REF, GITHUB_SHA].every(isDefined),
+      [GITHUB_REPOSITORY, GITHUB_WORKFLOW, GITHUB_ACTION, GITHUB_ACTOR, GITHUB_SHA].every(isDefined),
      'Missing required environment value. Are you running in GitHub Actions?'
  );

@@ -41,20 +42,26 @@ async function assumeRole(params) {
    // Supports only 'aws' partition. Customers in other partitions ('aws-cn') will need to provide full ARN
    roleArn = `arn:aws:iam::${sourceAccountId}:role/${roleArn}`;
  }
+  const tagArray = [
+    {Key: 'GitHub', Value: 'Actions'},
+    {Key: 'Repository', Value: GITHUB_REPOSITORY},
+    {Key: 'Workflow', Value: sanitizeGithubWorkflowName(GITHUB_WORKFLOW)},
+    {Key: 'Action', Value: GITHUB_ACTION},
+    {Key: 'Actor', Value: sanitizeGithubActor(GITHUB_ACTOR)},
+    {Key: 'Commit', Value: GITHUB_SHA},
+  ];
+
+  if (isDefined(process.env.GITHUB_REF)) {
+    tagArray.push({Key: 'Branch', Value: process.env.GITHUB_REF});
+  }
+
+  const roleSessionTags = roleSkipSessionTagging ? undefined : tagArray;

  const assumeRoleRequest = {
    RoleArn: roleArn,
    RoleSessionName: roleSessionName,
    DurationSeconds: roleDurationSeconds,
-    Tags: [
-      {Key: 'GitHub', Value: 'Actions'},
-      {Key: 'Repository', Value: GITHUB_REPOSITORY},
-      {Key: 'Workflow', Value: sanitizeGithubWorkflowName(GITHUB_WORKFLOW)},
-      {Key: 'Action', Value: GITHUB_ACTION},
-      {Key: 'Actor', Value: sanitizeGithubActor(GITHUB_ACTOR)},
-      {Key: 'Branch', Value: GITHUB_REF},
-      {Key: 'Commit', Value: GITHUB_SHA},
-    ]
+    Tags: roleSessionTags
  };

  if (roleExternalId) {
@@ -82,7 +89,7 @@ function sanitizeGithubWorkflowName(name) {
  // Workflow names can be almost any valid UTF-8 string, but tags are more restrictive.
  // This replaces anything not conforming to the tag restrictions by inverting the regular expression.
  // See the AWS documentation for constraint specifics https://docs.aws.amazon.com/STS/latest/APIReference/API_Tag.html.
-  const nameWithoutSpecialCharacters = name.replace(/[^\p{L}\p{Z}\p{N}_.:/=+-@]/gu, SANITIZATION_CHARACTER);
+  const nameWithoutSpecialCharacters = name.replace(/[^\p{L}\p{Z}\p{N}_:/=+.-@-]/gu, SANITIZATION_CHARACTER);
  const nameTruncated = nameWithoutSpecialCharacters.slice(0, MAX_TAG_VALUE_LENGTH)
  return nameTruncated
 }
@@ -94,19 +101,22 @@ function exportCredentials(params){

  // AWS_ACCESS_KEY_ID:
  // Specifies an AWS access key associated with an IAM user or role
-  core.exportVariable('AWS_ACCESS_KEY_ID', accessKeyId);
  core.setSecret(accessKeyId);
+  core.exportVariable('AWS_ACCESS_KEY_ID', accessKeyId);

  // AWS_SECRET_ACCESS_KEY:
  // Specifies the secret key associated with the access key. This is essentially the "password" for the access key.
-  core.exportVariable('AWS_SECRET_ACCESS_KEY', secretAccessKey);
  core.setSecret(secretAccessKey);
+  core.exportVariable('AWS_SECRET_ACCESS_KEY', secretAccessKey);

  // AWS_SESSION_TOKEN:
  // Specifies the session token value that is required if you are using temporary security credentials.
  if (sessionToken) {
-    core.exportVariable('AWS_SESSION_TOKEN', sessionToken);
    core.setSecret(sessionToken);
+    core.exportVariable('AWS_SESSION_TOKEN', sessionToken);
+  } else if (process.env.AWS_SESSION_TOKEN) {
+    // clear session token from previous credentials action
+    core.exportVariable('AWS_SESSION_TOKEN', '');
  }
 }

@@ -122,18 +132,61 @@ async function exportAccountId(maskAccountId, region) {
  const sts = getStsClient(region);
  const identity = await sts.getCallerIdentity().promise();
  const accountId = identity.Account;
-  core.setOutput('aws-account-id', accountId);
  if (!maskAccountId || maskAccountId.toLowerCase() == 'true') {
    core.setSecret(accountId);
  }
+  core.setOutput('aws-account-id', accountId);
  return accountId;
 }

+function loadCredentials() {
+  // Force the SDK to re-resolve credentials with the default provider chain.
+  //
+  // This action typically sets credentials in the environment via environment variables.
+  // The SDK never refreshes those env-var-based credentials after initial load.
+  // In case there were already env-var creds set in the actions environment when this action
+  // loaded, this action needs to refresh the SDK creds after overwriting those environment variables.
+  //
+  // The credentials object needs to be entirely recreated (instead of simply refreshed),
+  // because the credential object type could change when this action writes env var creds.
+  // For example, the first load could return EC2 instance metadata credentials
+  // in a self-hosted runner, and the second load could return environment credentials
+  // from an assume-role call in this action.
+  aws.config.credentials = null;
+
+  return new Promise((resolve, reject) => {
+    aws.config.getCredentials((err) => {
+      if (err) {
+        reject(err);
+      }
+      resolve(aws.config.credentials);
+    })
+  });
+}
+
+async function validateCredentials(expectedAccessKeyId) {
+  let credentials;
+  try {
+    credentials = await loadCredentials();
+
+    if (!credentials.accessKeyId) {
+      throw new Error('Access key ID empty after loading credentials');
+    }
+  } catch (error) {
+    throw new Error(`Credentials could not be loaded, please check your action inputs: ${error.message}`);
+  }
+
+  const actualAccessKeyId = credentials.accessKeyId;
+
+  if (expectedAccessKeyId && expectedAccessKeyId != actualAccessKeyId) {
+    throw new Error('Unexpected failure: Credentials loaded by the SDK do not match the access key ID configured by the action');
+  }
+}
+
 function getStsClient(region) {
-  const endpoint = util.format('https://sts.%s.amazonaws.com', region);
  return new aws.STS({
    region,
-    endpoint,
+    stsRegionalEndpoints: 'regional',
    customUserAgent: USER_AGENT
  });
 }
@@ -141,8 +194,8 @@ function getStsClient(region) {
 async function run() {
  try {
    // Get inputs
-    const accessKeyId = core.getInput('aws-access-key-id', { required: true });
-    const secretAccessKey = core.getInput('aws-secret-access-key', { required: true });
+    const accessKeyId = core.getInput('aws-access-key-id', { required: false });
+    const secretAccessKey = core.getInput('aws-secret-access-key', { required: false });
    const region = core.getInput('aws-region', { required: true });
    const sessionToken = core.getInput('aws-session-token', { required: false });
    const maskAccountId = core.getInput('mask-aws-account-id', { required: false });
@@ -150,14 +203,34 @@ async function run() {
    const roleExternalId = core.getInput('role-external-id', { required: false });
    const roleDurationSeconds = core.getInput('role-duration-seconds', {required: false}) || MAX_ACTION_RUNTIME;
    const roleSessionName = core.getInput('role-session-name', { required: false }) || ROLE_SESSION_NAME;
+    const roleSkipSessionTagging = core.getInput('role-skip-session-tagging', { required: false });
+  
+    if (!region.match(REGION_REGEX)) {
+      throw new Error(`Region is not valid: ${region}`);
+    }
+
+    exportRegion(region);

    // Always export the source credentials and account ID.
    // The STS client for calling AssumeRole pulls creds from the environment.
    // Plus, in the assume role case, if the AssumeRole call fails, we want
    // the source credentials and accound ID to already be masked as secrets
    // in any error messages.
-    exportRegion(region);
-    exportCredentials({accessKeyId, secretAccessKey, sessionToken});
+    if (accessKeyId) {
+      if (!secretAccessKey) {
+        throw new Error("'aws-secret-access-key' must be provided if 'aws-access-key-id' is provided");
+      }
+
+      exportCredentials({accessKeyId, secretAccessKey, sessionToken});
+    }
+
+    // Regardless of whether any source credentials were provided as inputs,
+    // validate that the SDK can actually pick up credentials.  This validates
+    // cases where this action is on a self-hosted runner that doesn't have credentials
+    // configured correctly, and cases where the user intended to provide input
+    // credentials but the secrets inputs resolved to empty strings.
+    await validateCredentials(accessKeyId);
+
    const sourceAccountId = await exportAccountId(maskAccountId, region);

    // Get role credentials if configured to do so
@@ -168,9 +241,11 @@ async function run() {
        roleToAssume,
        roleExternalId,
        roleDurationSeconds,
-        roleSessionName
+        roleSessionName,
+        roleSkipSessionTagging
      });
      exportCredentials(roleCredentials);
+      await validateCredentials(roleCredentials.accessKeyId);
      await exportAccountId(maskAccountId, region);
    }
  }
@@ -1,7 +1,7 @@
 const core = require('@actions/core');
 const assert = require('assert');
-
-const run = require('.');
+const aws = require('aws-sdk');
+const run = require('./index.js');

 jest.mock('@actions/core');

@@ -22,8 +22,8 @@ const ENVIRONMENT_VARIABLE_OVERRIDES = {
    GITHUB_WORKFLOW: 'MY-WORKFLOW-ID',
    GITHUB_ACTION: 'MY-ACTION-NAME',
    GITHUB_ACTOR: 'MY-USERNAME[bot]',
-    GITHUB_REF: 'MY-BRANCH',
    GITHUB_SHA: 'MY-COMMIT-ID',
+    GITHUB_REF: 'MY-BRANCH',
 };
 const GITHUB_ACTOR_SANITIZED = 'MY-USERNAME_bot_'

@@ -32,23 +32,26 @@ function mockGetInput(requestResponse) {
        return requestResponse[name]
    }
 }
-const REQUIRED_INPUTS = {
+const CREDS_INPUTS = {
    'aws-access-key-id': FAKE_ACCESS_KEY_ID,
    'aws-secret-access-key': FAKE_SECRET_ACCESS_KEY
 };
 const DEFAULT_INPUTS = {
-    ...REQUIRED_INPUTS,
+    ...CREDS_INPUTS,
    'aws-session-token': FAKE_SESSION_TOKEN,
    'aws-region': FAKE_REGION,
    'mask-aws-account-id': 'TRUE'
 };
-const ASSUME_ROLE_INPUTS = {...REQUIRED_INPUTS, 'role-to-assume': ROLE_ARN, 'aws-region': FAKE_REGION};
+const ASSUME_ROLE_INPUTS = {...CREDS_INPUTS, 'role-to-assume': ROLE_ARN, 'aws-region': FAKE_REGION};

 const mockStsCallerIdentity = jest.fn();
 const mockStsAssumeRole = jest.fn();

 jest.mock('aws-sdk', () => {
    return {
+        config: {
+            getCredentials: jest.fn()
+        },
        STS: jest.fn(() => ({
            getCallerIdentity: mockStsCallerIdentity,
            assumeRole: mockStsAssumeRole,
@@ -82,6 +85,27 @@ describe('Configure AWS Credentials', () => {
                }
            });

+        aws.config.getCredentials.mockReset();
+        aws.config.getCredentials
+            .mockImplementationOnce(callback => {
+                if (!aws.config.credentials) {
+                    aws.config.credentials = {
+                        accessKeyId: FAKE_ACCESS_KEY_ID,
+                        secretAccessKey: FAKE_SECRET_ACCESS_KEY
+                    }
+                }
+                callback(null);
+            })
+            .mockImplementationOnce(callback => {
+                if (!aws.config.credentials) {
+                    aws.config.credentials = {
+                        accessKeyId: FAKE_STS_ACCESS_KEY_ID,
+                        secretAccessKey: FAKE_STS_SECRET_ACCESS_KEY
+                    }
+                }
+                callback(null);
+            });
+
        mockStsAssumeRole.mockImplementation(() => {
            return {
                promise() {
@@ -118,8 +142,97 @@ describe('Configure AWS Credentials', () => {
        expect(core.setSecret).toHaveBeenCalledWith(FAKE_ACCOUNT_ID);
    });

+    test('action fails when github env vars are not set', async () => {
+        process.env.SHOW_STACK_TRACE = 'false';
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput(ASSUME_ROLE_INPUTS));
+        delete process.env.GITHUB_SHA;
+
+        await run();
+        expect(core.setFailed).toHaveBeenCalledWith('Missing required environment value. Are you running in GitHub Actions?');
+    });
+
+    test('action does not require GITHUB_REF env var', async () => {
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput(ASSUME_ROLE_INPUTS));
+        delete process.env.GITHUB_REF;
+
+        await run();
+    });
+
+    test('hosted runners can pull creds from a self-hosted environment', async () => {
+        const mockInputs = {'aws-region': FAKE_REGION};
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput(mockInputs));
+
+        await run();
+        expect(mockStsAssumeRole).toHaveBeenCalledTimes(0);
+        expect(core.exportVariable).toHaveBeenCalledTimes(2);
+        expect(core.setSecret).toHaveBeenCalledTimes(1);
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_DEFAULT_REGION', FAKE_REGION);
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_REGION', FAKE_REGION);
+        expect(core.setOutput).toHaveBeenCalledWith('aws-account-id', FAKE_ACCOUNT_ID);
+        expect(core.setSecret).toHaveBeenCalledWith(FAKE_ACCOUNT_ID);
+    });
+
+    test('action with no accessible credentials fails', async () => {
+        process.env.SHOW_STACK_TRACE = 'false';
+        const mockInputs = {'aws-region': FAKE_REGION};
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput(mockInputs));
+        aws.config.getCredentials.mockReset();
+        aws.config.getCredentials.mockImplementation(callback => {
+            callback(new Error('No credentials to load'));
+        });
+
+        await run();
+
+        expect(core.setFailed).toHaveBeenCalledWith("Credentials could not be loaded, please check your action inputs: No credentials to load");
+    });
+
+    test('action with empty credentials fails', async () => {
+        process.env.SHOW_STACK_TRACE = 'false';
+        const mockInputs = {'aws-region': FAKE_REGION};
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput(mockInputs));
+        aws.config.getCredentials.mockReset();
+        aws.config.getCredentials.mockImplementation(callback => {
+            aws.config.credentials = {
+                accessKeyId: ''
+            }
+            callback(null);
+        });
+
+        await run();
+
+        expect(core.setFailed).toHaveBeenCalledWith("Credentials could not be loaded, please check your action inputs: Access key ID empty after loading credentials");
+    });
+
+    test('action fails when credentials are not set in the SDK correctly', async () => {
+        process.env.SHOW_STACK_TRACE = 'false';
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput(ASSUME_ROLE_INPUTS));
+        aws.config.getCredentials.mockReset();
+        aws.config.getCredentials.mockImplementation(callback => {
+            aws.config.credentials = {
+                accessKeyId: FAKE_ACCESS_KEY_ID
+            }
+            callback(null);
+        });
+
+        await run();
+
+        expect(core.setFailed).toHaveBeenCalledWith("Unexpected failure: Credentials loaded by the SDK do not match the access key ID configured by the action");
+    });
+
    test('session token is optional', async () => {
-        const mockInputs = {...REQUIRED_INPUTS, 'aws-region': 'eu-west-1'};
+        const mockInputs = {...CREDS_INPUTS, 'aws-region': 'eu-west-1'};
        core.getInput = jest
            .fn()
            .mockImplementation(mockGetInput(mockInputs));
@@ -138,8 +251,66 @@ describe('Configure AWS Credentials', () => {
        expect(core.setSecret).toHaveBeenCalledWith(FAKE_ACCOUNT_ID);
    });

+    test('existing env var creds are cleared', async () => {
+        const mockInputs = {...CREDS_INPUTS, 'aws-region': 'eu-west-1'};
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput(mockInputs));
+        process.env.AWS_ACCESS_KEY_ID = 'foo';
+        process.env.AWS_SECRET_ACCESS_KEY = 'bar';
+        process.env.AWS_SESSION_TOKEN = 'helloworld';
+        aws.config.credentials = {
+            accessKeyId: 'foo',
+            secretAccessKey: 'bar',
+            sessionToken: 'helloworld'
+        };
+
+        await run();
+        expect(mockStsAssumeRole).toHaveBeenCalledTimes(0);
+        expect(core.exportVariable).toHaveBeenCalledTimes(5);
+        expect(core.setSecret).toHaveBeenCalledTimes(3);
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_ACCESS_KEY_ID', FAKE_ACCESS_KEY_ID);
+        expect(core.setSecret).toHaveBeenCalledWith(FAKE_ACCESS_KEY_ID);
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_SECRET_ACCESS_KEY', FAKE_SECRET_ACCESS_KEY);
+        expect(core.setSecret).toHaveBeenCalledWith(FAKE_SECRET_ACCESS_KEY);
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_SESSION_TOKEN', '');
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_DEFAULT_REGION', 'eu-west-1');
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_REGION', 'eu-west-1');
+        expect(core.setOutput).toHaveBeenCalledWith('aws-account-id', FAKE_ACCOUNT_ID);
+        expect(core.setSecret).toHaveBeenCalledWith(FAKE_ACCOUNT_ID);
+        expect(aws.config.credentials.accessKeyId).toBe(FAKE_ACCESS_KEY_ID);
+        expect(aws.config.credentials.secretAccessKey).toBe(FAKE_SECRET_ACCESS_KEY);
+        expect(aws.config.credentials.sessionToken).toBeUndefined();
+    });
+
+    test('validates region name', async () => {
+        process.env.SHOW_STACK_TRACE = 'false';
+
+        const mockInputs = {...CREDS_INPUTS, 'aws-region': '$AWS_REGION'};
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput(mockInputs));
+
+        await run();
+
+        expect(core.setFailed).toHaveBeenCalledWith('Region is not valid: $AWS_REGION');
+    });
+
+    test('throws error if access key id exists but missing secret access key', async () => {
+        process.env.SHOW_STACK_TRACE = 'false';
+        const inputsWIthoutSecretKey = {...ASSUME_ROLE_INPUTS}
+        inputsWIthoutSecretKey["aws-secret-access-key"] = undefined
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput(inputsWIthoutSecretKey));
+
+        await run();
+        expect(core.setFailed).toHaveBeenCalledWith("'aws-secret-access-key' must be provided if 'aws-access-key-id' is provided");
+
+    });
+
    test('can opt out of masking account ID', async () => {
-        const mockInputs = {...REQUIRED_INPUTS, 'aws-region': 'us-east-1', 'mask-aws-account-id': 'false'};
+        const mockInputs = {...CREDS_INPUTS, 'aws-region': 'us-east-1', 'mask-aws-account-id': 'false'};
        core.getInput = jest
            .fn()
            .mockImplementation(mockGetInput(mockInputs));
@@ -218,6 +389,36 @@ describe('Configure AWS Credentials', () => {
        expect(core.setOutput).toHaveBeenNthCalledWith(2, 'aws-account-id', FAKE_ROLE_ACCOUNT_ID);
    });

+    test('assume role can pull source credentials from self-hosted environment', async () => {
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput({'role-to-assume': ROLE_ARN, 'aws-region': FAKE_REGION}));
+
+        await run();
+        expect(mockStsAssumeRole).toHaveBeenCalledTimes(1);
+        expect(core.exportVariable).toHaveBeenCalledTimes(5);
+        expect(core.setSecret).toHaveBeenCalledTimes(5);
+        expect(core.setOutput).toHaveBeenCalledTimes(2);
+
+        // first the source account is exported and masked
+        expect(core.setSecret).toHaveBeenNthCalledWith(1, FAKE_ACCOUNT_ID);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(1, 'AWS_DEFAULT_REGION', FAKE_REGION);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(2, 'AWS_REGION', FAKE_REGION);
+        expect(core.setOutput).toHaveBeenNthCalledWith(1, 'aws-account-id', FAKE_ACCOUNT_ID);
+
+        // then the role credentials are exported and masked
+        expect(core.setSecret).toHaveBeenNthCalledWith(2, FAKE_STS_ACCESS_KEY_ID);
+        expect(core.setSecret).toHaveBeenNthCalledWith(3, FAKE_STS_SECRET_ACCESS_KEY);
+        expect(core.setSecret).toHaveBeenNthCalledWith(4, FAKE_STS_SESSION_TOKEN);
+        expect(core.setSecret).toHaveBeenNthCalledWith(5, FAKE_ROLE_ACCOUNT_ID);
+
+        expect(core.exportVariable).toHaveBeenNthCalledWith(3, 'AWS_ACCESS_KEY_ID', FAKE_STS_ACCESS_KEY_ID);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(4, 'AWS_SECRET_ACCESS_KEY', FAKE_STS_SECRET_ACCESS_KEY);
+        expect(core.exportVariable).toHaveBeenNthCalledWith(5, 'AWS_SESSION_TOKEN', FAKE_STS_SESSION_TOKEN);
+
+        expect(core.setOutput).toHaveBeenNthCalledWith(2, 'aws-account-id', FAKE_ROLE_ACCOUNT_ID);
+    });
+
    test('role assumption tags', async () => {
        core.getInput = jest
            .fn()
@@ -234,8 +435,8 @@ describe('Configure AWS Credentials', () => {
                {Key: 'Workflow', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_WORKFLOW},
                {Key: 'Action', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_ACTION},
                {Key: 'Actor', Value: GITHUB_ACTOR_SANITIZED},
-                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
                {Key: 'Commit', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_SHA},
+                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
            ]
        })
    });
@@ -256,8 +457,8 @@ describe('Configure AWS Credentials', () => {
                {Key: 'Workflow', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_WORKFLOW},
                {Key: 'Action', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_ACTION},
                {Key: 'Actor', Value: GITHUB_ACTOR_SANITIZED},
-                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
                {Key: 'Commit', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_SHA},
+                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
            ]
        })
    });
@@ -278,8 +479,8 @@ describe('Configure AWS Credentials', () => {
                {Key: 'Workflow', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_WORKFLOW},
                {Key: 'Action', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_ACTION},
                {Key: 'Actor', Value: GITHUB_ACTOR_SANITIZED},
-                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
                {Key: 'Commit', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_SHA},
+                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
            ]
        })
    });
@@ -287,7 +488,7 @@ describe('Configure AWS Credentials', () => {
    test('role name provided instead of ARN', async () => {
        core.getInput = jest
            .fn()
-            .mockImplementation(mockGetInput({...REQUIRED_INPUTS, 'role-to-assume': ROLE_NAME, 'aws-region': FAKE_REGION}));
+            .mockImplementation(mockGetInput({...CREDS_INPUTS, 'role-to-assume': ROLE_NAME, 'aws-region': FAKE_REGION}));

        await run();
        expect(mockStsAssumeRole).toHaveBeenCalledWith({
@@ -300,8 +501,8 @@ describe('Configure AWS Credentials', () => {
                {Key: 'Workflow', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_WORKFLOW},
                {Key: 'Action', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_ACTION},
                {Key: 'Actor', Value: GITHUB_ACTOR_SANITIZED},
-                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
                {Key: 'Commit', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_SHA},
+                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
            ]
        })
    });
@@ -322,8 +523,8 @@ describe('Configure AWS Credentials', () => {
                {Key: 'Workflow', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_WORKFLOW},
                {Key: 'Action', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_ACTION},
                {Key: 'Actor', Value: GITHUB_ACTOR_SANITIZED},
-                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
                {Key: 'Commit', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_SHA},
+                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
            ],
            ExternalId: 'abcdef'
        })
@@ -336,7 +537,7 @@ describe('Configure AWS Credentials', () => {

        process.env = {...process.env, GITHUB_WORKFLOW: 'Workflow!"#$%&\'()*+, -./:;<=>?@[]^_`{|}~🙂💥🍌1yFvMOeD3ZHYsHrGjCceOboMYzBPo0CRNFdcsVRG6UgR3A912a8KfcBtEVvkAS7kRBq80umGff8mux5IN1y55HQWPNBNyaruuVr4islFXte4FDQZexGJRUSMyHQpxJ8OmZnET84oDmbvmIjgxI6IBrdihX9PHMapT4gQvRYnLqNiKb18rEMWDNoZRy51UPX5sWK2GKPipgKSO9kqLckZai9D2AN2RlWCxtMqChNtxuxjqeqhoQZo0oaq39sjcRZgAAAAAAA'};

-        const sanitizedWorkflowName = 'Workflow__________+, -./:;<=>?@____________1yFvMOeD3ZHYsHrGjCceOboMYzBPo0CRNFdcsVRG6UgR3A912a8KfcBtEVvkAS7kRBq80umGff8mux5IN1y55HQWPNBNyaruuVr4islFXte4FDQZexGJRUSMyHQpxJ8OmZnET84oDmbvmIjgxI6IBrdihX9PHMapT4gQvRYnLqNiKb18rEMWDNoZRy51UPX5sWK2GKPipgKSO9kqLckZa'
+        const sanitizedWorkflowName = 'Workflow__________+_ -./:;<=>?@____________1yFvMOeD3ZHYsHrGjCceOboMYzBPo0CRNFdcsVRG6UgR3A912a8KfcBtEVvkAS7kRBq80umGff8mux5IN1y55HQWPNBNyaruuVr4islFXte4FDQZexGJRUSMyHQpxJ8OmZnET84oDmbvmIjgxI6IBrdihX9PHMapT4gQvRYnLqNiKb18rEMWDNoZRy51UPX5sWK2GKPipgKSO9kqLckZa'

        await run();
        expect(mockStsAssumeRole).toHaveBeenCalledWith({
@@ -349,10 +550,90 @@ describe('Configure AWS Credentials', () => {
                {Key: 'Workflow', Value: sanitizedWorkflowName},
                {Key: 'Action', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_ACTION},
                {Key: 'Actor', Value: GITHUB_ACTOR_SANITIZED},
-                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
                {Key: 'Commit', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_SHA},
+                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
            ]
        })
    });

+    test('skip tagging provided as true', async () => {
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput({...ASSUME_ROLE_INPUTS, 'role-skip-session-tagging': true}));
+
+        await run();
+        expect(mockStsAssumeRole).toHaveBeenCalledWith({
+            RoleArn: ROLE_ARN,
+            RoleSessionName: 'GitHubActions',
+            DurationSeconds: 21600,
+            Tags: undefined
+        })
+    });
+
+    test('skip tagging provided as false', async () => {
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput({...ASSUME_ROLE_INPUTS, 'role-skip-session-tagging': false}));
+
+        await run();
+        expect(mockStsAssumeRole).toHaveBeenCalledWith({
+            RoleArn: ROLE_ARN,
+            RoleSessionName: 'GitHubActions',
+            DurationSeconds: 21600,
+            Tags: [
+                {Key: 'GitHub', Value: 'Actions'},
+                {Key: 'Repository', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REPOSITORY},
+                {Key: 'Workflow', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_WORKFLOW},
+                {Key: 'Action', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_ACTION},
+                {Key: 'Actor', Value: GITHUB_ACTOR_SANITIZED},
+                {Key: 'Commit', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_SHA},
+                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
+            ]
+        })
+    });
+
+    test('skip tagging not provided', async () => {
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput({...ASSUME_ROLE_INPUTS}));
+
+        await run();
+        expect(mockStsAssumeRole).toHaveBeenCalledWith({
+            RoleArn: ROLE_ARN,
+            RoleSessionName: 'GitHubActions',
+            DurationSeconds: 21600,
+            Tags: [
+                {Key: 'GitHub', Value: 'Actions'},
+                {Key: 'Repository', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REPOSITORY},
+                {Key: 'Workflow', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_WORKFLOW},
+                {Key: 'Action', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_ACTION},
+                {Key: 'Actor', Value: GITHUB_ACTOR_SANITIZED},
+                {Key: 'Commit', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_SHA},
+                {Key: 'Branch', Value: ENVIRONMENT_VARIABLE_OVERRIDES.GITHUB_REF},
+            ]
+        })
+    });
+
+    test('masks variables before exporting', async () => {
+        let maskedValues = [];
+        const publicFields = ['AWS_REGION', 'AWS_DEFAULT_REGION'];
+        core.setSecret.mockReset();
+        core.setSecret.mockImplementation((secret) => {
+            maskedValues.push(secret);
+        });
+
+        core.exportVariable.mockReset();
+        core.exportVariable.mockImplementation((name, value) => {
+            if (!maskedValues.includes(value) && !publicFields.includes(name)) {
+                throw new Error(value + " for variable " + name + " is not masked yet!");
+            }
+        });
+
+        core.getInput = jest
+            .fn()
+            .mockImplementation(mockGetInput(ASSUME_ROLE_INPUTS));
+
+        await run();
+    });
+
 });
@@ -1,12 +1,12 @@
 {
  "name": "aws-actions-configure-aws-credentials",
-  "version": "1.2.0",
+  "version": "1.5.3",
  "description": "Configure AWS Credentials",
  "main": "index.js",
  "scripts": {
    "lint": "eslint **.js",
-    "package": "ncc build index.js -o dist",
-    "test": "eslint **.js && jest --coverage"
+    "package": "ncc build index.js -o dist && ncc build cleanup.js -o dist/cleanup",
+    "test": "npm run lint && jest --coverage --verbose"
  },
  "repository": {
    "type": "git",
@@ -25,12 +25,12 @@
  },
  "homepage": "https://github.com/aws-actions/configure-aws-credentials#readme",
  "dependencies": {
-    "@actions/core": "^1.2.3",
-    "aws-sdk": "^2.633.0"
+    "@actions/core": "^1.2.6",
+    "aws-sdk": "^2.762.0"
  },
  "devDependencies": {
-    "@zeit/ncc": "^0.21.1",
-    "eslint": "^6.8.0",
-    "jest": "^25.1.0"
+    "@zeit/ncc": "^0.22.3",
+    "eslint": "^7.10.0",
+    "jest": "^26.4.2"
  }
 }