Initial commit

src/installer.ts

@@ -0,0 +1,69 @@
+import decompress = require('decompress');
+import decompresstarxz = require('decompress-tarxz');
+import * as download from 'download';
+import * as fs from 'fs';
+import * as os from 'os';
+import * as path from 'path';
+import * as util from 'util';
+import * as restm from 'typed-rest-client/RestClient';
+
+let osPlat: string = os.platform();
+let osArch: string = os.arch();
+
+export async function getUPX(version: string): Promise<string> {
+  const selected = await determineVersion(version);
+  if (selected) {
+    version = selected;
+  }
+
+  console.log(`✅ UPX version found: ${version}`);
+  const tmpdir = fs.mkdtempSync(path.join(os.tmpdir(), 'upx-'));
+  const fileName = getFileName(version);
+  const downloadUrl = util.format('https://github.com/upx/upx/releases/download/v%s/%s', version, fileName);
+
+  console.log(`⬇️ Downloading ${downloadUrl}...`);
+  await download.default(downloadUrl, tmpdir, {filename: fileName});
+
+  console.log('📦 Extracting UPX...');
+  if (osPlat == 'win32') {
+    await decompress(`${tmpdir}/${fileName}`, tmpdir, {strip: 1});
+  } else {
+    await decompresstarxz(`${tmpdir}/${fileName}`, tmpdir, {strip: 1});
+  }
+
+  return path.join(tmpdir, osPlat == 'win32' ? 'upx.exe' : 'upx');
+}
+
+function getFileName(version: string): string {
+  let platform: string = '';
+  if (osPlat == 'win32') {
+    platform = osArch == 'x64' ? 'win64' : 'win32';
+  } else if (osPlat == 'linux') {
+    platform = osArch == 'x64' ? 'amd64_linux' : 'i386_linux';
+  }
+  const ext: string = osPlat == 'win32' ? 'zip' : 'tar.xz';
+  return util.format('upx-%s-%s.%s', version, platform, ext);
+}
+
+interface GitHubRelease {
+  tag_name: string;
+}
+
+async function determineVersion(version: string): Promise<string> {
+  let rest: restm.RestClient = new restm.RestClient('ghaction-upx', 'https://github.com', undefined, {
+    headers: {
+      Accept: 'application/json'
+    }
+  });
+
+  if (version !== 'latest') {
+    version = `v${version}`;
+  }
+
+  let res: restm.IRestResponse<GitHubRelease> = await rest.get<GitHubRelease>(`/upx/upx/releases/${version}`);
+  if (res.statusCode != 200 || res.result === null) {
+    throw new Error(`Cannot find UPX ${version} release (http ${res.statusCode})`);
+  }
+
+  return res.result.tag_name.replace(/^v/, '');
+}