draft

src/installer.ts

@@ -0,0 +1,47 @@
+// Load tempDirectory before it gets wiped by tool-cache
+let tempDirectory = process.env['RUNNER_TEMPDIRECTORY'] || '';
+
+import * as core from '@actions/core';
+import * as tc from '@actions/tool-cache';
+import * as path from 'path';
+
+if (!tempDirectory) {
+  let baseLocation: string;
+  if (process.platform === 'win32') {
+    baseLocation = process.env['USERPROFILE'] || 'C:\\';
+  } else {
+    if (process.platform === 'darwin') {
+      baseLocation = '/Users';
+    } else {
+      baseLocation = '/home';
+    }
+  }
+  tempDirectory = path.join(baseLocation, 'actions', 'temp');
+}
+
+export async function getMaven(version: string) {
+  let toolPath: string;
+  toolPath = tc.find('maven', version);
+
+  if (!toolPath) {
+    toolPath = await downloadMaven(version);
+  }
+
+  toolPath = path.join(toolPath, 'bin');
+  core.addPath(toolPath);
+}
+
+async function downloadMaven(version: string): Promise<string> {
+  const toolDirectoryName = 'apache-maven-${version}';
+  const downloadUrl =
+    'https://www-eu.apache.org/dist/maven/maven-3/${version}/binaries/${toolDirectoryName}-bin.tar.gz';
+
+  try {
+    const downloadPath = await tc.downloadTool(downloadUrl);
+    const extractedPath = await tc.extractTar(downloadPath);
+    let toolRoot = path.join(extractedPath, toolDirectoryName);
+    return await tc.cacheDir(toolRoot, 'maven', version);
+  } catch (err) {
+    throw err;
+  }
+}

src/setup-maven.ts

@@ -0,0 +1,15 @@
+import * as core from '@actions/core';
+import * as installer from './installer';
+
+async function run() {
+  try {
+    let version = core.getInput('maven-version');
+    if (version) {
+      await installer.getMaven(version);
+    }
+  } catch (error) {
+    core.setFailed(error.message);
+  }
+}
+
+run();