Add initial implementation

.eslintrc.json

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+{
+    "env": {
+        "commonjs": true,
+        "es6": true,
+        "node": true,
+        "jest": true
+    },
+    "extends": "eslint:recommended",
+    "globals": {
+        "Atomics": "readonly",
+        "SharedArrayBuffer": "readonly"
+    },
+    "parserOptions": {
+        "ecmaVersion": 2018
+    },
+    "rules": {
+    }
+}

.gitignore

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+# comment this out distribution branches
+node_modules/
+
+# Editors
+.vscode
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Other Dependency directories
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# next.js build output
+.next

action.yml

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+name: 'Setup AWS'
+description: 'Setup an AWS CLI compatible environment'
+inputs:
+  aws-access-key-id:
+    description: 'Your AWS access key id credential'
+    required: true
+  aws-secret-access-key:
+    description: 'Your AWS secret access key credential'
+    required: true
+  aws-default-region:
+    description: 'Default AWS region, e.g. us-east-2'
+    required: true
+  aws-default-output:
+    description: 'Default output format, e.g. json'
+    required: false
+    default: json
+runs:
+  using: 'node12'
+  main: 'dist/index.js'

index.js

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+const path = require('path');
+const core = require('@actions/core');
+const io = require('@actions/io');
+
+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 defaultRegion = core.getInput('aws-default-region', { required: true });
+    const outputFormat = core.getInput('aws-default-output', { required: false });
+    const awsHome = path.join(process.env.RUNNER_TEMP, '.aws');
+
+    // Ensure awsHome is a directory that exists
+    await io.mkdirP(awsHome);
+
+    // Configure the AWS CLI using environment variables
+
+    // AWS_ACCESS_KEY_ID:
+    // Specifies an AWS access key associated with an IAM user or role
+    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);
+
+    // AWS_DEFAULT_REGION:
+    // Specifies the AWS Region to send requests to
+    core.exportVariable('AWS_DEFAULT_REGION', defaultRegion);
+
+    // AWS_DEFAULT_OUTPUT:
+    // Specifies the output format to use
+    core.exportVariable('AWS_DEFAULT_OUTPUT', outputFormat);
+
+    // AWS_CONFIG_FILE:
+    // Specifies the location of the file that the AWS CLI uses to store configuration profiles.
+    core.exportVariable('AWS_CONFIG_FILE', path.join(awsHome, 'config'));
+
+    // AWS_SHARED_CREDENTIALS_FILE:
+    // Specifies the location of the file that the AWS CLI uses to store access keys.
+    core.exportVariable('AWS_SHARED_CREDENTIALS_FILE', path.join(awsHome, 'credentials'));
+  }
+  catch (error) {
+    core.setFailed(error.message);
+  }
+}
+
+module.exports = run;
+
+/* istanbul ignore next */
+if (require.main === module) {
+    run();
+}

index.test.js

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+const core = require('@actions/core');
+const io = require('@actions/io');
+
+const run = require('.');
+
+jest.mock('@actions/core');
+jest.mock('@actions/io');
+
+describe('Setup AWS', () => {
+
+    beforeEach(() => {
+        jest.clearAllMocks();
+
+        core.getInput = jest
+            .fn()
+            .mockReturnValueOnce('MY-AWS-ACCESS-KEY-ID')     // aws-access-key-id
+            .mockReturnValueOnce('MY-AWS-SECRET-ACCESS-KEY') // aws-secret-access-key
+            .mockReturnValueOnce('us-east-2')                // aws-default-region
+            .mockReturnValueOnce('json');                    // aws-default-output
+    });
+
+    test('exports env vars', async () => {
+        await run();
+        expect(core.exportVariable).toHaveBeenCalledTimes(6);
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_ACCESS_KEY_ID', 'MY-AWS-ACCESS-KEY-ID');
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_SECRET_ACCESS_KEY', 'MY-AWS-SECRET-ACCESS-KEY');
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_DEFAULT_REGION', 'us-east-2');
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_DEFAULT_OUTPUT', 'json');
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_CONFIG_FILE', '/runner/home/.aws/config');
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_SHARED_CREDENTIALS_FILE', '/runner/home/.aws/credentials');
+    });
+
+    test('aws can be configured for a different region', async () => {
+        core.getInput = jest
+            .fn()
+            .mockReturnValueOnce('MY-AWS-ACCESS-KEY-ID')     // aws-access-key-id
+            .mockReturnValueOnce('MY-AWS-SECRET-ACCESS-KEY') // aws-secret-access-key
+            .mockReturnValueOnce('eu-west-1')                // aws-default-region
+            .mockReturnValueOnce('json');                    // aws-default-output
+
+        await run();
+        expect(core.exportVariable).toHaveBeenCalledWith('AWS_DEFAULT_REGION', 'eu-west-1');
+    });
+
+    test('error is caught by core.setFailed', async () => {
+        io.mkdirP = jest
+            .fn()
+            .mockImplementation(() => {
+                throw new Error();
+            });
+
+        await run();
+
+        expect(core.setFailed).toBeCalled();
+    });
+});

jest.config.js

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+module.exports = {
+  testEnvironment: 'node',
+  setupFiles: ['./jest.setup-env.js']
+};

jest.setup-env.js

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+process.env.RUNNER_TEMP = '/runner/home';

package.json

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+{
+  "name": "setup-aws",
+  "version": "0.0.0",
+  "description": "Setup AWS",
+  "main": "index.js",
+  "scripts": {
+    "lint": "eslint **.js",
+    "package": "ncc build index.js -o dist",
+    "test": "eslint **.js && jest --coverage"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/aws/setup-aws.git"
+  },
+  "keywords": [
+    "AWS",
+    "GitHub",
+    "Actions",
+    "JavaScript"
+  ],
+  "author": "GitHub",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/aws/setup-aws/issues"
+  },
+  "homepage": "https://github.com/aws/setup-aws#readme",
+  "dependencies": {
+    "@actions/core": "^1.2.0",
+    "@actions/exec": "^1.0.1",
+    "@actions/io": "^1.0.1"
+  },
+  "devDependencies": {
+    "@zeit/ncc": "^0.20.5",
+    "eslint": "^6.5.1",
+    "jest": "^24.9.0"
+  }
+}