Gorilla sessions not working for CORS from client - session

Question

I have set up a Go rest api. And on login I do this:
session, _ := store.New(r, sessionId)
session.Options.MaxAge = 12 * 3600
err := session.Save(r, w)
//treat error
and for checking the session i have smth like this:
session, err := store.Get(r, sessionId)
//treat error
if session.IsNew {
http.Error(w, "Unauthorized session.", http.StatusUnauthorized)
return
}
If I do the requests from postman it works fine, but when I do them from my client I get 401. Has any of you experienced something like this? The store is a CookieStore.
I already checked the id's, I replaced sessionId variable with a static string. Gorilla session uses gorilla context to register a new request and when I do the request from postman context.data[r] is not null, but from the client it is always null -> always a new session.
https://github.com/gorilla/context/blob/master/context.go - line 33
it is called in
https://github.com/gorilla/sessions/blob/master/sessions.go - line 122
wich is used in the CookieStore.Get function in
https://github.com/gorilla/sessions/blob/master/store.go - line 77
EDIT 1:
For the client I use polymer and I tried xmlhttp too.
Polymer:
<iron-ajax
id="ajaxRequest"
auto
url="{{requestUrl}}"
headers="{{requestHeaders}}"
handle-as="json"
on-response="onResponse"
on-error="onError"
content-type="application/json"
>
</iron-ajax>
and the handlers
onResponse: function(response){
console.log(response.detail.response);
this.items = response.detail.response
},
onError: function(error){
console.log(error.detail)
},
ready: function(){
this.requestUrl = "http://localhost:8080/api/fingerprint/company/" + getCookie("companyId");
this.requestHeaders = {"Set-cookie": getCookie("api_token")}
}
and the cookie successfully reaches the backend.
And xmlhttp:
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == XMLHttpRequest.DONE ) {
if(xmlhttp.status == 200){
//do stuff
}else if(xmlhttp.status == 401){
page.redirect("/unauthorized")
}else{
page.redirect("/error")
}
}
}
xmlhttp.open("GET","http://localhost:8080/api/fingerprint/company/" + getCookie("companyId"),true);
xmlhttp.setRequestHeader("Set-cookie", getCookie("api_token"));
xmlhttp.send();
EDIT 2:
So I tried debugging with fiddler(thanks for the suggestion) and i found out that the request from postman has an bold entry Cookies / Login and the request from the client does not. Any idea how to get/set that value? It is somehow automatically set in Postman. In the authentication request I get a set-cookie header that has all the data that I need but I can't get it on the client. I get Refused to get unsafe header set-cookie.

Answer 1

The problem is that in the client the requests need to have withCredentials = true and after that the browser deals with everything. It gets the cookie from the set-cookie header and it sends the cookies via the cookie header. So, after all, it was not a gorilla sessions problem.

Answer 2

If anyone else is having the same problem I was having and you want to whitelist all domains/wildcards (or have a list of domains in an array you can scan through), you can do something like this.
domain_raw := r.Host
domain_host_parts := strings.Split(domain_raw, ".")
domain := domain_host_parts[1] + "." + domain_host_parts[2]
domains := getDomains() // stores a slice of all your allowable domains
has_domain := false
for _, d := range domains {
if d == domain {
has_domain = true
break
}
}
if has_domain == false {
return
} else {
w.Header().Add("Access-Control-Allow-Origin", "https://"+domain_raw)
w.Header().Add("Access-Control-Allow-Credentials", "true")
}
I love go