Created
December 19, 2012 15:12
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Recipe to require that a user log in before reaching an http Handler func, without specifying it in app.yaml (similar to Python App Engine's @login_required decorator)
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| package mustlogin | |
| import ( | |
| "appengine" | |
| "appengine/user" | |
| "fmt" | |
| "net/http" | |
| ) | |
| func init() { | |
| http.HandleFunc("/1", MustLogin(loggedIn)) | |
| http.Handle("/2", MustLoginHandler{loggedIn}) | |
| } | |
| func loggedIn(w http.ResponseWriter, r *http.Request, u user.User) { | |
| fmt.Fprintln(w, "<html><body>") | |
| fmt.Fprintln(w, u.Email) | |
| url, _ := user.LogoutURL(appengine.NewContext(r), r.URL.String()) | |
| fmt.Fprintln(w, "<br /><a href=\""+url+"\">Log out</a>") | |
| fmt.Fprintln(w, "</body></html>") | |
| } | |
| // Option 1: Use a closure | |
| func MustLogin(done func(http.ResponseWriter, *http.Request, user.User)) http.HandlerFunc { | |
| return func(w http.ResponseWriter, r *http.Request) { | |
| c := appengine.NewContext(r) | |
| if u := user.Current(c); u == nil { | |
| url, _ := user.LoginURL(c, r.URL.String()) | |
| http.Redirect(w, r, url, http.StatusSeeOther) | |
| } else { | |
| done(w, r, *u) | |
| } | |
| } | |
| } | |
| // Option 2: Use a http.Handler | |
| type MustLoginHandler struct { | |
| inner func(http.ResponseWriter, *http.Request, user.User) | |
| } | |
| func (h MustLoginHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { | |
| c := appengine.NewContext(r) | |
| if u := user.Current(c); u == nil { | |
| url, _ := user.LoginURL(c, r.URL.String()) | |
| http.Redirect(w, r, url, http.StatusSeeOther) | |
| } else { | |
| h.inner(w, r, *u) | |
| } | |
| } |
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Thanks for the comments!
Re: formatting -- This appears to be a bug with Gists, it looks fine in Chrome on OSX, terrible in Chrome on Linux... I just copy/pasted this from correctly gofmt'd code :(
Re: error handling on LoginURL -- I wasn't sure how best to handle it, require the user's func to take an error as well? I wouldn't want to panic or write to the response since the downstream user might not want that...