[Review pls] Google based authentication with sessions

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Kai Hendry

Apr 21, 2019, 4:38:06 AM4/21/19
to Gorilla web toolkit
Hi guys,

https://github.com/kaihendry/internal-google-login/blob/master/main.go#L148 - for example I am not sure ID can be forged. Probably not.

Am I correct in thinking I don't need to be using https://github.com/gorilla/securecookie as sessions uses them?

Any other tips to make my minimal example, more minimal? Destroying the session on logout seemed pretty tricky. As well as logging the sessions values:

Thank you in advance!

Kai Hendry

Apr 22, 2019, 11:24:40 PM4/22/19
to Gorilla web toolkit
Another more specific question about the API, is it really OK to ignore the error here?

func indexHandler(w http.ResponseWriter, req *http.Request) {
    session, _ := store.Get(req, sessionName)
    err := views.ExecuteTemplate(w, "index.html", session.Values)
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)

Do please see the full project here: https://github.com/kaihendry/internal-google-login

Matt S

Apr 23, 2019, 2:24:32 AM4/23/19
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Hey Kai - 

• You don’t (should not) need to use both sessions & securecookie. sessions is higher level and much easier to use.
• Definitely check the error from store.Get

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Matt S

Apr 23, 2019, 2:27:17 AM4/23/19
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• cookie values can’t be forged. Cookies are authenticated cryptographically (which is also why you should check for the error)
• you can delete the values in session.Values before logging a user out. 

Kai Hendry

Apr 23, 2019, 8:39:15 AM4/23/19
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On Tue, 23 Apr 2019 at 14:27, Matt S <elit...@gmail.com> wrote:
> • you can delete the values in session.Values before logging a user out.

Oh... Is it worth doing both whilst logging out a user? Struggling to
find a canonical example that does this on Github search.

Am I missing a trick for logging the values?

mapString := make(map[string]string)
// https://stackoverflow.com/a/48226206/4534
for key, value := range session.Values {
strKey := fmt.Sprintf("%v", key)
strValue := fmt.Sprintf("%v", value)
mapString[strKey] = strValue
return logs.WithFields(log.Fields{
"auth": mapString,

If there are good sources I should read, please point them out!

Kai Hendry

Apr 26, 2019, 8:15:33 AM4/26/19
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Made a video about what little know about sessions:
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