auth/live.go: Added RefreshTokenSourceWriter (#143)

minecraft/auth/live.go

@@ -51,7 +51,15 @@ func (src *tokenSource) Token() (*oauth2.Token, error) {
 // refreshes the token everytime it expires. Note that this function must be used over oauth2.ReuseTokenSource
 // due to that function not refreshing with the correct scopes.
 func RefreshTokenSource(t *oauth2.Token) oauth2.TokenSource {
-	return oauth2.ReuseTokenSource(t, &tokenSource{w: os.Stdout, t: t})
+	return RefreshTokenSourceWriter(t, os.Stdout)
+}
+
+// RefreshTokenSourceWriter returns a new oauth2.TokenSource using the oauth2.Token passed that automatically
+// refreshes the token everytime it expires. It requests from io.Writer if the oauth2.Token is invalid.
+// Note that this function must be used over oauth2.ReuseTokenSource due to that
+// function not refreshing with the correct scopes.
+func RefreshTokenSourceWriter(t *oauth2.Token, w io.Writer) oauth2.TokenSource {
+	return oauth2.ReuseTokenSource(t, &tokenSource{w: w, t: t})
 }
 
 // RequestLiveToken does a login request for Microsoft Live Connect using device auth. A login URL will be