Add form value name for xsrf tokens.

config.go

@@ -32,14 +32,15 @@ type Config struct {
 
 	EmailFrom          string
 	EmailSubjectPrefix string
+	SMTPAddress        string
+	SMTPAuth           smtp.Auth
 
-	SMTPAddress string
-	SMTPAuth    smtp.Auth
+	XSRFName  string
+	XSRFMaker XSRF
 
 	Storer            Storer
 	CookieStoreMaker  CookieStoreMaker
 	SessionStoreMaker SessionStoreMaker
-	XSRFMaker         XSRF
 	LogWriter         io.Writer
 	Callbacks         *Callbacks
 	Mailer            Mailer

xsrf.go

@@ -3,4 +3,4 @@ package authboss
 import "net/http"
 
 // XSRF returns a token that should be written to forms to prevent xsrf attacks.
-type XSRF func(http.ResponseWriter, *http.Request) string
+type XSRF func(http.ResponseWriter, *http.Request) (token string)