From cf56c1ccf0cf40f711bd91c222a275778558e0e9 Mon Sep 17 00:00:00 2001
From: Patrick Peng Sun <patrick@lawipac.com>
Date: Sun, 16 Jul 2017 23:14:36 +1000
Subject: [PATCH] clear cookie

---
 crmpixel.go | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/crmpixel.go b/crmpixel.go
index c437f22..d28b2e8 100644
--- a/crmpixel.go
+++ b/crmpixel.go
@@ -106,6 +106,13 @@ func cookieCreate(name, value string, expireInSeconds int) (ret http.Cookie) {
 	return
 }
 
+//set to "" and make it expire
+func cookieClear(name string) (ret http.Cookie) {
+	expiration := time.Unix(0, 0) //Epoc
+	ret = http.Cookie{Name: name, Value: "", Expires: expiration}
+	return
+}
+
 func crmCreateNewAnonymousLeadByHTTPRequest(r *http.Request) (info crmdLead) {
 	info.FirstName = "Anonymous"
 	info.LastName = "User " + r.RemoteAddr
@@ -230,6 +237,7 @@ func setTrackingCookieAndRecirect(w http.ResponseWriter, r *http.Request) {
 	if ok {
 		log.Println("setlead cookie :" + leadID[0])
 		cookie := cookieFromLeadID(leadID[0])
+		log.Println(cookie)
 		http.SetCookie(w, &cookie)
 	} else {
 		cookie := crmpixelCookie(r)
@@ -248,9 +256,16 @@ func setTrackingCookieAndRecirect(w http.ResponseWriter, r *http.Request) {
 		if k == "lid" || k == "url" || k == "expire" || k == "nonce" || k == "signature" || k == "timestamp" { //skip lead id and URL and expire
 			continue
 		}
-		log.Printf("set cookie %s=%s", k, v)
-		cookie := cookieCreate(k, v[0], expire)
-		http.SetCookie(w, &cookie)
+
+		if v[0] != "" {
+			log.Printf("set cookie %s=%s", k, v)
+			cookie := cookieCreate(k, v[0], expire)
+			http.SetCookie(w, &cookie)
+		} else { //clear cook
+			log.Printf("clear cookie %s=%s", k, v)
+			cookie := cookieClear(k)
+			http.SetCookie(w, &cookie)
+		}
 	}
 
 	//perform redirect