125 lines
3.0 KiB
Go
125 lines
3.0 KiB
Go
package web
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import (
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"crypto/sha256"
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"fmt"
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"net/http"
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"time"
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"github.com/gorilla/sessions"
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log "github.com/sirupsen/logrus"
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)
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var secured = false
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var store *sessions.CookieStore
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const authorityKey = "AUTH_TIMESTAMP"
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const sessionName = "session"
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func initializeAuth(h *handler) {
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secured = false
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if h.config.Username != "" && h.config.Password != "" {
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store = sessions.NewCookieStore(generateSessionStorageKey(h.config.Username, h.config.Password))
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store.Options.HttpOnly = true
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store.Options.SameSite = http.SameSiteLaxMode
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store.Options.MaxAge = 0
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secured = true
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}
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}
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func authorizationRequired(f http.HandlerFunc) http.Handler {
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if secured {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if isAuthorized(r) {
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f(w, r)
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} else {
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http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
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}
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})
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} else {
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return f
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}
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}
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func isAuthorized(r *http.Request) bool {
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if !secured {
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return true
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}
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session, _ := store.Get(r, sessionName)
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if session.IsNew {
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return false
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}
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if _, ok := session.Values[authorityKey]; ok {
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// TODO check for timestamp
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return true
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}
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return false
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}
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func (h *handler) isAuthorizationNeeded(r *http.Request) bool {
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return secured && !isAuthorized(r)
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}
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func (h *handler) validateCredentials(w http.ResponseWriter, r *http.Request) {
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if !secured {
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log.Panic("Validating credentials without username and password should not happen")
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}
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if r.Method != "POST" {
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log.Fatal("Expecting credential validation method to be POST")
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http.Error(w, http.StatusText(http.StatusNotAcceptable), http.StatusNotAcceptable)
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return
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}
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if err := r.ParseMultipartForm(4 * 1024); err != nil {
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log.Fatalf("Error while parsing form data: %v", err)
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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user := r.PostFormValue("username")
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pass := r.PostFormValue("password")
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session, _ := store.Get(r, sessionName)
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if user == h.config.Username && pass == h.config.Password {
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session.Values[authorityKey] = time.Now().Unix()
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if err := session.Save(r, w); err != nil {
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log.Fatalf("Error while parsing saving session: %v", err)
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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w.WriteHeader(http.StatusOK)
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w.Write([]byte(http.StatusText(http.StatusOK)))
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return
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}
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http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
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}
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func (h *handler) clearSession(w http.ResponseWriter, r *http.Request) {
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if !secured {
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log.Panic("Validating credentials with secured=false should not happen")
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}
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session, _ := store.Get(r, sessionName)
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delete(session.Values, authorityKey)
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if err := session.Save(r, w); err != nil {
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log.Fatalf("Error while parsing saving session: %v", err)
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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http.Redirect(w, r, h.config.Base, http.StatusTemporaryRedirect)
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}
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func generateSessionStorageKey(username string, password string) []byte {
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key := sha256.Sum256([]byte(fmt.Sprintf("%s:%s", username, password)))
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return key[:]
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}
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