refreshing the token if HTTP 401 is returned (#83)

README

@@ -1,4 +1,4 @@
-Grive 0.2.0
+Grive 0.3.0
 9 June 2012
 
 http://www.lbreda.com/grive/
@@ -14,7 +14,6 @@ There are a few things that Grive does not do at the moment:
 - wait for changes in file system to occur and upload. A sync is only performed when you run Grive.
 - symbolic links support
 - support for Google documents
-- support for files >2GB
   
 Of course these will be added in the future, possibly the next release.
 
@@ -48,3 +47,11 @@ current directory. It will also start downloading files from your Google Drive t
 your current directory.
 
 Enjoy!
+
+Version History:
+
+Grive v0.3: Bug fix release
+Fixed bugs:
+	#93: missing reference count increment in one of the Json constructors
+	#82: retry for HTTP error 500 & 503
+	#77: Fixed a bug where grive crashed on the first run.

libgrive/src/protocol/AuthAgent.cc

@@ -125,6 +125,7 @@ std::string AuthAgent::Unescape( const std::string& str )
 
 bool AuthAgent::CheckRetry( long response )
 {
+	// HTTP 500 and 503 should be temperory. just wait a bit and retry
 	if ( response == 500 || response == 503 )
 	{
 		Log( "resquest failed due to temperory error: %1%. retrying in 5 seconds",
@@ -133,6 +134,17 @@ bool AuthAgent::CheckRetry( long response )
 		os::Sleep( 5 ) ;
 		return true ;
 	}
+	
+	// HTTP 401 Unauthorized. the auth token has been expired. refresh it
+	else if ( response == 401 )
+	{
+		Log( "resquest failed due to auth token expired: %1%. refreshing token",
+			response, log::warning ) ;
+			
+		m_auth.Refresh() ;
+		return true ;
+	}
+	
 	else
 		return false ;
 }