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auth.go
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auth.go
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package api
import (
"encoding/gob"
"encoding/json"
"fmt"
"html/template"
"net/http"
"github.com/gorilla/mux"
"github.com/markbates/goth/gothic"
"github.com/op/go-logging"
"github.com/microscaling/microbadger/database"
)
var (
// Special log setting so we can debug the auth details if we need them
logauth = logging.MustGetLogger("mmauth")
)
func init() {
gob.Register(database.User{})
}
func authHandler(w http.ResponseWriter, r *http.Request) {
var next string
vars := mux.Vars(r)
next = vars["next"]
if next != "" {
session, err := sessionStore.Get(r, "session-name")
if err != nil {
log.Errorf("Failed to get session from session store %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
session.Values["next"] = next
session.Save(r, w)
if err != nil {
log.Errorf("Failed to save session info in authCallback %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
logauth.Debugf("Session: %#v", session)
}
gothic.BeginAuthHandler(w, r)
}
func authCallbackHandler(w http.ResponseWriter, r *http.Request) {
var u database.User
user, err := gothic.CompleteUserAuth(w, r)
if err != nil {
log.Errorf("Failed authorization %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
session, err := sessionStore.Get(r, "session-name")
if err != nil {
log.Errorf("Failed to get session from session store %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
val := session.Values["user"]
logauth.Debugf("Pre-existing session user %#v ", val)
// If you're already logged in, this is adding another auth to an existing user, which we need to retrieve
if val != nil {
var ok bool
if u, ok = val.(database.User); !ok {
log.Errorf("Unexpectedly got a user from the session that failed type assertion")
w.WriteHeader(http.StatusInternalServerError)
return
}
}
// We can't store goth.User in our database so we make sure we have our own user with the salient information
u, err = db.GetOrCreateUser(u, user)
if err != nil {
log.Errorf("Failed to get or create user %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
logauth.Debugf("Now logged in user is %#v ", u)
next := session.Values["next"].(string)
session.Values["user"] = u
session.Values["next"] = ""
err = session.Save(r, w)
if err != nil {
log.Errorf("Failed to save session info in authCallback %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if next != "" {
log.Debugf("redirecting to %s", next)
http.Redirect(w, r, next, http.StatusFound)
}
}
func isLoggedIn(r *http.Request) (isLoggedIn bool, user database.User, err error) {
session, err := sessionStore.Get(r, "session-name")
if err != nil {
log.Errorf("Failed to get session from session store: %v", err)
return false, user, err
}
val := session.Values["user"]
logauth.Debugf("isLoggedIn? session user %#v ", val)
if val != nil {
if user, isLoggedIn = val.(database.User); !isLoggedIn {
err = fmt.Errorf("Unexpectedly got a user from the session that failed type assertion")
}
}
return isLoggedIn, user, err
}
func meHandler(w http.ResponseWriter, r *http.Request) {
isLoggedIn, user, err := isLoggedIn(r)
if err != nil {
log.Errorf("Failed to get session info %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
log.Debugf("Logged in %t", isLoggedIn)
bytes, err := json.Marshal(user)
if err != nil {
log.Errorf("Error: %v", err)
}
w.Write([]byte(bytes))
}
func logoutHandler(w http.ResponseWriter, r *http.Request) {
session, err := sessionStore.Get(r, "session-name")
if err != nil {
log.Errorf("Failed to get session info in logout%v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
session.Values["user"] = nil
err = session.Save(r, w)
if err != nil {
log.Errorf("Failed to save session info in logout %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
vars := mux.Vars(r)
next := vars["next"]
if next != "" {
log.Debugf("redirecting to %s", next)
http.Redirect(w, r, next, http.StatusFound)
}
}
func loggedInTest(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
next := vars["next"]
if next != "" {
log.Debugf("Log in redirecting to %s", next)
} else {
next = "/__/anotherpage"
}
isLoggedIn, user, err := isLoggedIn(r)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
if isLoggedIn {
t, _ := template.New("loggedIn").Parse(`<p>Hello {{.Name}} <a href="/v1/logout?next=/__/test">Logout</a></p>`)
t.Execute(w, user)
} else {
t, _ := template.New("loggedOut").Parse(`<p>Come on in - <a href="/v1/auth/github?next=` + next + `">Log in with GitHub</a></p>`)
t.Execute(w, "")
}
}
func anotherPageTest(w http.ResponseWriter, r *http.Request) {
isLoggedIn, user, err := isLoggedIn(r)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
if isLoggedIn {
t, _ := template.New("another").Parse(`<p>Hello {{.Name}} This is another page. <a href="/v1/logout?next=/__/anotherpage">Logout</a></p></a></p>`)
t.Execute(w, user)
} else {
t, _ := template.New("anotherOut").Parse(`<p>You're not logged in, you should go <a href="/__/test">here</a></p>`)
t.Execute(w, "")
}
}