Check AWS CLI version

Add tests

src/aws.ts

@@ -0,0 +1,32 @@
+import * as semver from 'semver';
+import * as io from '@actions/io';
+import * as execm from './exec';
+
+export const isECR = async (registry: string): Promise<boolean> => {
+  return registry.includes('amazonaws');
+};
+
+export const getCLI = async (): Promise<string> => {
+  return io.which('aws', true);
+};
+
+export const getCLIVersion = async (): Promise<string | undefined> => {
+  return execm.exec('aws', ['--version'], true).then(res => {
+    if (res.stderr != '' && !res.success) {
+      throw new Error(res.stderr);
+    }
+    return parseCLIVersion(res.stdout);
+  });
+};
+
+export const parseCLIVersion = async (stdout: string): Promise<string | undefined> => {
+  const matches = /aws-cli\/([0-9.]+)/.exec(stdout);
+  if (matches) {
+    return semver.clean(matches[1]);
+  }
+  return undefined;
+};
+
+export const getRegion = async (registry: string): Promise<string> => {
+  return registry.substring(registry.indexOf('ecr.') + 4, registry.indexOf('.amazonaws'));
+};