renamed site directory to server

internal/server/login.go

@@ -0,0 +1,72 @@
+package server
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"ruben/inventory2/internal/domains/authentication"
+	"ruben/inventory2/internal/server/cookies"
+	"ruben/inventory2/internal/server/response"
+)
+
+// TODO: use a login/logout server? (prefix: '/auth'?)
+
+// GET /login
+func (s *Server) loginPage(r *http.Request) (response.Response, error) {
+	ctx := r.Context()
+
+	u, err := newLoginURL(ctx, s.auth, "/")
+	if err != nil {
+		return nil, err
+	}
+
+	return response.TemporaryRedirect(u), nil
+}
+
+func newLoginURL(ctx context.Context, auth *authentication.Authenticator, targetURI string) (string, error) {
+	state, err := auth.NewState(ctx, targetURI)
+	if err != nil {
+		return "", fmt.Errorf("failed to generate random state: %w", err)
+	}
+
+	base64EncodedState := fmt.Sprintf("%x", state[:])
+
+	return auth.AuthCodeURL(base64EncodedState), nil
+}
+
+// GET /login/callback
+func (s *Server) loginCallback(r *http.Request) (response.Response, error) {
+	ctx := r.Context()
+	q := r.URL.Query()
+
+	// obtain token and profile
+
+	accessToken, targetURI, expiration, err := s.auth.Exchange(ctx, q.Get("state"), q.Get("code"))
+	if err != nil {
+		return nil, response.Unauthorized().
+			Msg(fmt.Sprintf("Failed to exchange an authorization code for a token")).
+			Wrap(err)
+	}
+
+	// set access_token cookie and redirect to a reasonable place
+
+	return response.TemporaryRedirect(targetURI).
+		Cookie(cookies.AccessToken(accessToken, expiration)), nil
+}
+
+// GET /logout
+func (s *Server) logoutPage(r *http.Request) (response.Response, error) {
+	host := r.Header.Get("X-Forwarded-Host")
+	if host == "" {
+		host = r.Host
+	}
+
+	if ck, err := r.Cookie("access_token"); err == nil && ck != nil {
+		if err := s.auth.DeleteOAuthTokens(r.Context(), ck.Value); err != nil {
+			fmt.Println("[ERROR] failed to delete auth token:", err)
+		}
+	}
+
+	return response.TemporaryRedirect(s.auth.GetLogoutURL(host).String()).
+		Cookie(cookies.Expired("access_token")), nil
+}