From df2f1001eeabefe80127e004e30b9790c11ece69 Mon Sep 17 00:00:00 2001
From: hannahhoward <hannah@hannahhoward.net>
Date: Thu, 4 Mar 2021 18:32:00 -0800
Subject: [PATCH] feat(linksystem): add option to disable hash on read

Have boolean that specifies whether the storage is trusted. if it is, skip hashing on reads
---
 linking.go    | 3 +++
 linksystem.go | 1 +
 2 files changed, 4 insertions(+)

diff --git a/linking.go b/linking.go
index 07200fe1..823d5e21 100644
--- a/linking.go
+++ b/linking.go
@@ -56,6 +56,9 @@ func (lsys *LinkSystem) Fill(lnkCtx LinkContext, lnk Link, na NodeAssembler) err
 	if err != nil {
 		return err
 	}
+	if lsys.TrustedStorage {
+		return decoder(na, reader)
+	}
 	tee := io.TeeReader(reader, hasher)
 	decodeErr := decoder(na, tee)
 	if decodeErr != nil { // It is important to security to check the hash before returning any other observation about the content.
diff --git a/linksystem.go b/linksystem.go
index 88942198..299b8d34 100644
--- a/linksystem.go
+++ b/linksystem.go
@@ -32,6 +32,7 @@ type LinkSystem struct {
 	HasherChooser      func(LinkPrototype) (hash.Hash, error)
 	StorageWriteOpener BlockWriteOpener
 	StorageReadOpener  BlockReadOpener
+	TrustedStorage     bool
 }
 
 // The following two types define the two directions of transform that a codec can be expected to perform: