gtoken: use custom server to generate token (#19)

* use custome server to generate token

* fix test fail issue

googletrans/client.py

@@ -35,8 +35,8 @@ class Translator(object):
         self.session.headers.update({
             'User-Agent': user_agent,
         })
-        self.token_acquirer = TokenAcquirer(session=self.session)
         self.service_urls = service_urls or ['translate.google.com']
+        self.token_acquirer = TokenAcquirer(session=self.session, host=self.service_urls[0])
 
         # Use HTTP2 Adapter if hyper is installed
         try:  # pragma: nocover

googletrans/gtoken.py

@@ -41,9 +41,10 @@ class TokenAcquirer(object):
     RE_TKK = re.compile(r'TKK=eval\(\'\(\(function\(\)\{(.+?)\}\)\(\)\)\'\);',
                         re.DOTALL)
 
-    def __init__(self, tkk='0', session=None):
+    def __init__(self, tkk='0', session=None, host='translate.google.com'):
         self.session = session or requests.Session()
         self.tkk = tkk
+        self.host = host if 'http' in host else 'https://' + host
 
     def _update(self):
         """update tkk
@@ -53,7 +54,7 @@ class TokenAcquirer(object):
         if self.tkk and int(self.tkk.split('.')[0]) == now:
             return
 
-        r = self.session.get('https://translate.google.com')
+        r = self.session.get(self.host)
         # this will be the same as python code after stripping out a reserved word 'var'
         code = unicode(self.RE_TKK.search(r.text).group(1)).replace('var ', '')
         # unescape special ascii characters such like a \x3d(=)