Add MTLS credentials setup for maven

Add MTLS setup credentials incldufing GHA parameters
to be able to use maven for accessing MTLS protected
maven repo

src/maven.ts

@@ -0,0 +1,97 @@
+import * as core from '@actions/core';
+import * as fs from 'fs';
+import * as path from 'path';
+import * as constants from './constants';
+import * as os from 'os';
+import * as io from '@actions/io';
+
+export interface MavenOpts {
+  caCert: string;
+  keystore: string;
+  password: string;
+  settings: string;
+  securitySettings: string;
+}
+
+export function validateOptions(opts: MavenOpts): boolean {
+  if (
+    (opts.caCert === '' ||
+      opts.keystore === '' ||
+      opts.password === '' ||
+      opts.securitySettings === '',
+    opts.settings === '')
+  ) {
+    core.debug('maven options set is not valid: some field is empty');
+    return false;
+  }
+  return true;
+}
+
+export function isValidOptions(mvnOpts: MavenOpts): boolean {
+  if (
+    (mvnOpts.caCert !== '' ||
+      mvnOpts.keystore !== '' ||
+      mvnOpts.password !== '' ||
+      mvnOpts.securitySettings !== '',
+    mvnOpts.settings !== '') &&
+    !validateOptions(mvnOpts)
+  ) {
+    return false;
+  }
+
+  return true;
+}
+
+export async function setupMaven(opts: MavenOpts): Promise<void> {
+  const settingsDir = path.join(
+    core.getInput(constants.INPUT_SETTINGS_PATH) || os.homedir(),
+    core.getInput(constants.INPUT_SETTINGS_PATH) ? '' : '.m2'
+  );
+  const certDir = path.join(os.homedir(), 'certs');
+
+  fs.writeFileSync(
+    path.join(settingsDir, 'settings.xml'),
+    btoa(opts.settings),
+    {
+      encoding: 'utf-8',
+      flag: 'w'
+    }
+  );
+
+  fs.writeFileSync(
+    path.join(settingsDir, 'settings-security.xml'),
+    btoa(opts.securitySettings),
+    {
+      encoding: 'utf-8',
+      flag: 'w'
+    }
+  );
+
+  await io.mkdirP(certDir);
+  fs.writeFileSync(path.join(certDir, 'rootca.crt'), btoa(opts.caCert), {
+    encoding: 'utf-8',
+    flag: 'w'
+  });
+
+  const p12Path = path.join(certDir, 'certificate.p12');
+  fs.writeFileSync(p12Path, btoa(opts.keystore), {
+    encoding: 'utf-8',
+    flag: 'w'
+  });
+
+  const password = btoa(opts.password);
+  core.exportVariable(
+    'MAVEN_OPTS',
+    `-Djavax.net.ssl.keyStore=${p12Path} -Djavax.net.ssl.keyStoreType=pkcs12 -Djavax.net.ssl.keyStorePassword=${password}`
+  );
+
+  core.debug(`added maven opts for MTLS access`);
+}
+
+const btoa = function(str: string) {
+  return Buffer.from(str, 'binary').toString('base64');
+};
+
+const atob = function(str: string) {
+  return Buffer.from(str, 'base64').toString('binary');
+};