Adding maven auth support

src/auth.ts

@@ -0,0 +1,31 @@
+import * as fs from 'fs';
+import * as os from 'os';
+import * as path from 'path';
+import * as core from '@actions/core';
+import * as io from '@actions/io';
+
+export async function configAuthentication(username: string, password: string) {
+  const directory: string = path.join(os.homedir(), '.m2');
+  await io.mkdirP(directory);
+  await write(directory, generate(username, password));
+}
+
+// only exported for testing purposes
+export function generate(
+  username = '${actions.username}',
+  password = '${actions.password}'
+) {
+  return `<settings>
+                <servers>
+                <server>
+                    <username>${username}</username>
+                    <password>${password}</password>
+                </server>
+                </servers>
+            </settings>
+    `;
+}
+
+async function write(directory: string, settings: string) {
+  return fs.writeFileSync(path.join(directory, 'settings.xml'), settings);
+}

src/setup-java.ts

@@ -1,5 +1,6 @@
 import * as core from '@actions/core';
 import * as installer from './installer';
+import * as auth from './auth';
 import * as path from 'path';
 
 async function run() {
@@ -14,6 +15,13 @@ async function run() {
 
     await installer.getJava(version, arch, jdkFile, javaPackage);
 
+    const username = core.getInput('username', {required: false});
+    const password = core.getInput('password', {required: false});
+
+    if (username && password) {
+      await auth.configAuthentication(username, password);
+    }
+
     const matchersPath = path.join(__dirname, '..', '.github');
     console.log(`##[add-matcher]${path.join(matchersPath, 'java.json')}`);
   } catch (error) {