DevTools: Build release mode using JS and Python

third_party/WebKit/Source/devtools/scripts/utils.js

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var fs = require("fs");
+var http = require("http");
+var https = require("https");
+var parseURL = require("url").parse;
+var Stream = require("stream").Transform;
+
+function fetch(url)
+{
+    return new Promise(fetchPromise);
+
+    function fetchPromise(resolve, reject)
+    {
+        var request;
+        var protocol = parseURL(url).protocol;
+        var handleResponse = getCallback.bind(null, resolve, reject);
+        if (protocol === "https:") {
+            request = https.get(url, handleResponse);
+        } else if (protocol === "http:") {
+            request = http.get(url, handleResponse);
+        } else {
+            reject(new Error(`Invalid protocol for url: ${url}`));
+            return;
+        }
+        request.on("error", err => reject(err));
+    }
+
+    function getCallback(resolve, reject, response)
+    {
+        if (response.statusCode !== 200) {
+            reject(new Error(`Request error: + ${response.statusCode}`));
+            return;
+        }
+        var body = new Stream();
+        response.on("data", chunk => body.push(chunk));
+        response.on("end", () => resolve(body.read()));
+    }
+}
+
+function atob(str)
+{
+    return new Buffer(str, "base64").toString("binary");
+}
+
+
+function isFile(path)
+{
+    try {
+        return fs.statSync(path).isFile();
+    } catch (e) {
+        return false;
+    }
+}
+
+module.exports = {
+    fetch,
+    atob,
+    isFile,
+};