chore(release): 1.4.2

Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.706.0 to 2.707.0.
- [Release notes](https://github.com/aws/aws-sdk-js/releases)
- [Changelog](https://github.com/aws/aws-sdk-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-js/compare/v2.706.0...v2.707.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.dependabot/config.yml

@@ -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"

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: monthly
+  open-pull-requests-limit: 10

.mergify.yml

@@ -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

CHANGELOG.md

@@ -2,6 +2,54 @@
 
 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.
 
+### [1.4.2](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)
 
 

README.md

@@ -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 +157,33 @@ 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 '*'._
 
+## 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).

action.yml

@@ -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

index.js

@@ -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.
@@ -82,7 +82,7 @@ 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
 }
@@ -107,6 +107,9 @@ function exportCredentials(params){
   if (sessionToken) {
     core.exportVariable('AWS_SESSION_TOKEN', sessionToken);
     core.setSecret(sessionToken);
+  } else if (process.env.AWS_SESSION_TOKEN) {
+    // clear session token from previous credentials action
+    core.exportVariable('AWS_SESSION_TOKEN', '');
   }
 }
 
@@ -129,11 +132,54 @@ async function exportAccountId(maskAccountId, region) {
   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 +187,8 @@ 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 });
@@ -151,13 +197,32 @@ async function run() {
     const roleDurationSeconds = core.getInput('role-duration-seconds', {required: false}) || MAX_ACTION_RUNTIME;
     const roleSessionName = core.getInput('role-session-name', { required: false }) || ROLE_SESSION_NAME;
 
+    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
@@ -171,6 +236,7 @@ async function run() {
         roleSessionName
       });
       exportCredentials(roleCredentials);
+      await validateCredentials(roleCredentials.accessKeyId);
       await exportAccountId(maskAccountId, region);
     }
   }

index.test.js

@@ -1,6 +1,6 @@
 const core = require('@actions/core');
 const assert = require('assert');
-
+const aws = require('aws-sdk');
 const run = require('.');
 
 jest.mock('@actions/core');
@@ -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 +142,77 @@ describe('Configure AWS Credentials', () => {
         expect(core.setSecret).toHaveBeenCalledWith(FAKE_ACCOUNT_ID);
     });
 
+    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 +231,53 @@ 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('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 +356,36 @@ 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()
@@ -287,7 +455,7 @@ 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({
@@ -336,7 +504,7 @@ 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({

package.json

@@ -1,6 +1,6 @@
 {
   "name": "aws-actions-configure-aws-credentials",
-  "version": "1.2.0",
+  "version": "1.4.2",
   "description": "Configure AWS Credentials",
   "main": "index.js",
   "scripts": {
@@ -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": "^1.2.4",
+    "aws-sdk": "^2.707.0"
   },
   "devDependencies": {
-    "@zeit/ncc": "^0.21.1",
-    "eslint": "^6.8.0",
-    "jest": "^25.1.0"
+    "@zeit/ncc": "^0.22.3",
+    "eslint": "^7.3.1",
+    "jest": "^26.1.0"
   }
 }