ADD unit tests, split and refactor source code

src/assets/binary.js

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+const { join } = require('path');
+const { existsSync, renameSync, chmodSync } = require('fs');
+const { getInstallationPath } = require('../common');
+
+function verifyAndPlaceBinary(binName, binPath, callback) {
+  if (!existsSync(join(binPath, binName))) {
+    return callback(`Downloaded binary does not contain the binary specified in configuration - ${binName}`);
+  }
+
+  getInstallationPath((err, installationPath) => {
+      if (err) {
+        return callback(err);
+      }
+
+      // Move the binary file and make sure it is executable
+      renameSync(join(binPath, binName), join(installationPath, binName));
+      chmodSync(join(installationPath, binName), '755');
+
+      console.log('Placed binary on', join(installationPath, binName));
+
+      callback(null);
+  });
+}
+
+module.exports = verifyAndPlaceBinary;

src/assets/move.js

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+const { join } = require('path');
+const { createWriteStream } = require('fs');
+
+/**
+ * Move strategy for binary resources without compression.
+ */
+function move({ opts, req, onSuccess, onError }) {
+
+  const stream = createWriteStream(join(opts.binPath, opts.binName));
+
+  stream.on('error', onError);
+  stream.on('close', onSuccess);
+
+  req.pipe(stream);
+}
+
+module.exports = move;

src/assets/untar.js

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+const tar = require('tar');
+const zlib = require('zlib');
+
+/**
+ * Unzip strategy for resources using `.tar.gz`.
+ *
+ * First we will Un-GZip, then we will untar. So once untar is completed,
+ * binary is downloaded into `binPath`. Verify the binary and call it good.
+ */
+function untar({ opts, req, onSuccess, onError }) {
+
+  const ungz = zlib.createGunzip();
+  const untar = tar.Extract({ path: opts.binPath });
+
+  ungz.on('error', onError);
+  untar.on('error', onError);
+
+  // First we will Un-GZip, then we will untar. So once untar is completed,
+  // binary is downloaded into `binPath`. Verify the binary and call it good
+  untar.on('end', onSuccess);
+
+  req.pipe(ungz).pipe(untar);
+}
+
+module.exports = untar;