1 files changed, 23 insertions, 7 deletions
diff --git a/src/protocol.lisp b/src/protocol.lisp
index 19a4791..d25aa22 100644
--- a/src/protocol.lisp
+++ b/src/protocol.lisp
@@ -52,7 +52,7 @@ that the request has insufficient permissions to evoke the endpoint handler. "))
   (:documentation "Signalled whenever a required slot is missing from a endpoint
    instance object."))
 
-(define-condition not-found (protocol-error)
+(define-condition not-found (protocol-error) ()
   (:default-initargs :status-code 404))
 
 (defgeneric protocol-error-result (err)
@@ -88,15 +88,18 @@ that the request has insufficient permissions to evoke the endpoint handler. "))
           (invoke-debugger err)
           (http:abort-request-handler)))))
 
-(defun protocol-error (error-class req &rest kwargs)
+(defun protocol-error (error-class ep &rest kwargs)
   (apply #'error
          error-class
          :raw-request http:*request*
-         :class (class-of req)
+         :class (class-of ep)
          kwargs))
 
-(defun not-found (req)
-  (protocol-error 'not-found req))
+
+(defun slot-required (ep slot)
+  "Signals a SLOT-REQUIRED condition"
+  (protocol-error 'slot-required ep :missing-slot slot))
+
 
 ;;; HANDLER PROTOCOL
 
@@ -105,13 +108,13 @@ that the request has insufficient permissions to evoke the endpoint handler. "))
 this. Called before handling, should be used to supply
 user-identifying data to the endpoint instance that might be needed by
 the handle function.")
-  (:method ((req t)) t))
+  (:method ((ep t)) t))
 
 (defgeneric authorize (endpoint)
   (:documentation "Returns a boolean. Any endpoint requiring special ownership
 permissions should implement this.  Called before handling and after
 authenticate.")
-  (:method ((req t)) t))
+  (:method ((ep t)) t))
 
 (defgeneric handle (endpoint)
   (:documentation "The beef of the endpoint handling protocol.
@@ -139,6 +142,19 @@ MUST be implemented for every endpoint class.")
     (unless (authorize endpoint)
       (protocol-error 'not-authorized endpoint))))
 
+;;; HANDLER TOOLS
 
+(defun not-found (ep)
+  "Signals a NOT-FOUND condition. Usually called within HANDLE or
+AUTHORIZE while handling endpoint-class instance EP."
+  (protocol-error 'not-found ep))
 
+(defun redirect (url)
+  "Redirect to URL."
+  (http:redirect url :code http:+http-see-other+))
 
+(defun redirect-to (class &rest kwargs)
+  "Redirect to another endpoint. CLASS can be either a symbol or a
+   class. KWARGS is a PLIST of keyword arguments supplied to the
+   CLASS' route builder function."
+  (redirect (apply #'route-to class kwargs)))