chore: apply sourceURL override, log line for debugging

Author: shirish87

lib/LocalBinary.js

@@ -16,19 +16,24 @@ function LocalBinary(){
   this.is64bits = process.arch == 'x64';
 
   this.getDownloadPath = function () {
+    let sourceURL = 'https://www.browserstack.com/local-testing/downloads/binaries/';
+    if (process.env.BROWSERSTACK_LOCAL_BIN_URL) {
+      sourceURL = process.env.BROWSERSTACK_LOCAL_BIN_URL;
+    }
+
     if(this.hostOS.match(/darwin|mac os/i)){
-      return 'https://www.browserstack.com/local-testing/downloads/binaries/BrowserStackLocal-darwin-x64';
+      return sourceURL + 'BrowserStackLocal-darwin-x64';
     } else if(this.hostOS.match(/mswin|msys|mingw|cygwin|bccwin|wince|emc|win32/i)) {
       this.windows = true;
-      return 'https://www.browserstack.com/local-testing/downloads/binaries/BrowserStackLocal.exe';
+      return sourceURL + 'BrowserStackLocal.exe';
     } else {
       if(this.is64bits) {
         if(this.isAlpine())
-          return 'https://www.browserstack.com/local-testing/downloads/binaries/BrowserStackLocal-alpine';
+          return sourceURL + 'BrowserStackLocal-alpine';
         else
-          return 'https://www.browserstack.com/local-testing/downloads/binaries/BrowserStackLocal-linux-x64';
+          return sourceURL + 'BrowserStackLocal-linux-x64';
       } else {
-        return 'https://www.browserstack.com/local-testing/downloads/binaries/BrowserStackLocal-linux-ia32';
+        return sourceURL + 'BrowserStackLocal-linux-ia32';
       }
     }
   };
@@ -140,6 +145,10 @@ function LocalBinary(){
     https.get(options, function (response) {
       const contentEncoding = response.headers['content-encoding'];
       if (typeof contentEncoding === 'string' && contentEncoding.match(/gzip/i)) {
+        if (process.env.BROWSERSTACK_LOCAL_DEBUG_GZIP) {
+          console.info('using gzip in ' + options.headers['user-agent']);
+        }
+
         response.pipe(zlib.createGunzip()).pipe(fileStream);
       } else {
         response.pipe(fileStream);

lib/download.js

@@ -31,6 +31,10 @@ options.headers = Object.assign({}, options.headers, {
 https.get(options, function (response) {
   const contentEncoding = response.headers['content-encoding'];
   if (typeof contentEncoding === 'string' && contentEncoding.match(/gzip/i)) {
+    if (process.env.BROWSERSTACK_LOCAL_DEBUG_GZIP) {
+      console.info('using gzip in ' + options.headers['user-agent']);
+    }
+
     response.pipe(zlib.createGunzip()).pipe(fileStream);
   } else {
     response.pipe(fileStream);