This is the v1 version, had the v2 before.

backend/appendlimit.go

@@ -0,0 +1,29 @@
+package backend
+
+import (
+	"errors"
+)
+
+// An error that should be returned by User.CreateMessage when the message size
+// is too big.
+var ErrTooBig = errors.New("Message size exceeding limit")
+
+// A backend that supports retrieving per-user message size limits.
+type AppendLimitBackend interface {
+	Backend
+
+	// Get the fixed maximum message size in octets that the backend will accept
+	// when creating a new message. If there is no limit, return nil.
+	CreateMessageLimit() *uint32
+}
+
+// A user that supports retrieving per-user message size limits.
+type AppendLimitUser interface {
+	User
+
+	// Get the fixed maximum message size in octets that the backend will accept
+	// when creating a new message. If there is no limit, return nil.
+	//
+	// This overrides the global backend limit.
+	CreateMessageLimit() *uint32
+}