feat: redirect to original page after login

internal/server/handlers/authentication.go

@@ -11,7 +11,7 @@ import (
 	jwtInternal "github.com/mentos1386/zdravko/pkg/jwt"
 )
 
-const sessionName = "zdravko-hey"
+const authenticationSessionName = "zdravko-hey"
 
 type AuthenticatedPrincipal struct {
 	User   *AuthenticatedUser
@@ -48,7 +48,7 @@ func GetUser(ctx context.Context) *AuthenticatedUser {
 }
 
 func (h *BaseHandler) AuthenticateRequestWithCookies(r *http.Request) (*AuthenticatedUser, error) {
-	session, err := h.store.Get(r, sessionName)
+	session, err := h.store.Get(r, authenticationSessionName)
 	if err != nil {
 		return nil, err
 	}
@@ -114,7 +114,7 @@ func (h *BaseHandler) AuthenticateRequestWithToken(r *http.Request) (*Authentica
 }
 
 func (h *BaseHandler) SetAuthenticatedUserForRequest(w http.ResponseWriter, r *http.Request, user *AuthenticatedUser) error {
-	session, err := h.store.Get(r, sessionName)
+	session, err := h.store.Get(r, authenticationSessionName)
 	if err != nil {
 		return err
 	}
@@ -124,24 +124,16 @@ func (h *BaseHandler) SetAuthenticatedUserForRequest(w http.ResponseWriter, r *h
 	session.Values["oauth2_refresh_token"] = user.OAuth2RefreshToken
 	session.Values["oauth2_token_type"] = user.OAuth2TokenType
 	session.Values["oauth2_expiry"] = user.OAuth2Expiry.Format(time.RFC3339)
-	err = h.store.Save(r, w, session)
+	return h.store.Save(r, w, session)
-	if err != nil {
-		return err
-	}
-	return nil
 }
 
 func (h *BaseHandler) ClearAuthenticatedUserForRequest(w http.ResponseWriter, r *http.Request) error {
-	session, err := h.store.Get(r, sessionName)
+	session, err := h.store.Get(r, authenticationSessionName)
 	if err != nil {
 		return err
 	}
 	session.Options.MaxAge = -1
-	err = h.store.Save(r, w, session)
+	return h.store.Save(r, w, session)
-	if err != nil {
-		return err
-	}
-	return nil
 }
 
 type AuthenticatedHandler func(http.ResponseWriter, *http.Request, *AuthenticatedPrincipal)
@@ -159,7 +151,7 @@ func (h *BaseHandler) Authenticated(next echo.HandlerFunc) echo.HandlerFunc {
 			if user.OAuth2Expiry.Before(time.Now()) {
 				user, err = h.RefreshToken(c.Response(), c.Request(), user)
 				if err != nil {
-					return c.Redirect(http.StatusTemporaryRedirect, "/oauth2/login")
+					return c.Redirect(http.StatusTemporaryRedirect, "/oauth2/login?redirect="+c.Request().URL.Path)
 				}
 			}
 
@@ -173,6 +165,6 @@ func (h *BaseHandler) Authenticated(next echo.HandlerFunc) echo.HandlerFunc {
 			return next(cc)
 		}
 
-		return c.Redirect(http.StatusTemporaryRedirect, "/oauth2/login")
+		return c.Redirect(http.StatusTemporaryRedirect, "/oauth2/login?redirect="+c.Request().URL.Path)
 	}
 }

internal/server/handlers/oauth2.go

@@ -19,6 +19,45 @@ import (
 	"golang.org/x/oauth2"
 )
 
+const oauth2RedirectSessionName = "zdravko-hey-oauth2"
+
+func (h *BaseHandler) setOAuth2Redirect(c echo.Context, redirect string) error {
+	w := c.Response()
+	r := c.Request()
+
+	session, err := h.store.Get(r, oauth2RedirectSessionName)
+	if err != nil {
+		return err
+	}
+	session.Values["redirect"] = redirect
+	return h.store.Save(r, w, session)
+}
+
+func (h *BaseHandler) getOAuth2Redirect(c echo.Context) (string, error) {
+	r := c.Request()
+
+	session, err := h.store.Get(r, oauth2RedirectSessionName)
+	if err != nil {
+		return "", err
+	}
+	if session.IsNew {
+		return "", nil
+	}
+	return session.Values["redirect"].(string), nil
+}
+
+func (h *BaseHandler) clearOAuth2Redirect(c echo.Context) error {
+	w := c.Response()
+	r := c.Request()
+
+	session, err := h.store.Get(r, oauth2RedirectSessionName)
+	if err != nil {
+		return err
+	}
+	session.Options.MaxAge = -1
+	return h.store.Save(r, w, session)
+}
+
 type UserInfo struct {
 	Id    int    `json:"id"` // FIXME: This might not always be int?
 	Sub   string `json:"sub"`
@@ -97,6 +136,14 @@ func (h *BaseHandler) OAuth2LoginGET(c echo.Context) error {
 
 	url := conf.AuthCodeURL(state, oauth2.AccessTypeOffline)
 
+	redirect := c.QueryParam("redirect")
+	h.logger.Info("OAuth2LoginGET", "redirect", redirect)
+
+	err = h.setOAuth2Redirect(c, redirect)
+	if err != nil {
+		return err
+	}
+
 	return c.Redirect(http.StatusTemporaryRedirect, url)
 }
 
@@ -156,7 +203,21 @@ func (h *BaseHandler) OAuth2CallbackGET(c echo.Context) error {
 		return err
 	}
 
-	return c.Redirect(http.StatusTemporaryRedirect, "/settings")
+	redirect, err := h.getOAuth2Redirect(c)
+	if err != nil {
+		return err
+	}
+	h.logger.Info("OAuth2CallbackGET", "redirect", redirect)
+	if redirect == "" {
+		redirect = "/settings"
+	}
+
+	err = h.clearOAuth2Redirect(c)
+	if err != nil {
+		return err
+	}
+
+	return c.Redirect(http.StatusTemporaryRedirect, redirect)
 }
 
 func (h *BaseHandler) OAuth2LogoutGET(c echo.Context) error {