From 3bc100aeb3f0763f78c8b3a70165b9f8aaa52db5 Mon Sep 17 00:00:00 2001
From: Eduardo M KALINOWSKI
Date: Sat, 16 Feb 2019 18:55:54 -0200
Subject: reverse mode: support wildcard exclude (--exclude-wildcard)

This adds support for gitignore-like wildcards and exclude patters in
reverse mode. It (somewhat) fixes #273: no regexp support, but the
syntax should be powerful enough to satisfy most needs.

Also, since adding a lot of --exclude options can be tedious, it adds
the --exclude-from option to read patterns from a file (or files).
---
 internal/nametransform/longnames.go      |  7 +++++++
 internal/nametransform/longnames_test.go |  8 ++++++++
 internal/nametransform/names.go          | 21 +++++++++++++++++++++
 3 files changed, 36 insertions(+)

(limited to 'internal/nametransform')

diff --git a/internal/nametransform/longnames.go b/internal/nametransform/longnames.go
index 7a6d413..1bbcbb6 100644
--- a/internal/nametransform/longnames.go
+++ b/internal/nametransform/longnames.go
@@ -69,6 +69,13 @@ func IsLongContent(cName string) bool {
 	return NameType(cName) == LongNameContent
 }
 
+// RemoveLongNameSuffix removes the ".name" suffix from cName, returning the corresponding
+// content file name.
+// No check is made if cName actually is a LongNameFilename.
+func RemoveLongNameSuffix(cName string) string {
+	return cName[:len(cName)-len(LongNameSuffix)]
+}
+
 // ReadLongName - read cName + ".name" from the directory opened as dirfd.
 //
 // Symlink-safe through Openat().
diff --git a/internal/nametransform/longnames_test.go b/internal/nametransform/longnames_test.go
index 8fa19fe..4210492 100644
--- a/internal/nametransform/longnames_test.go
+++ b/internal/nametransform/longnames_test.go
@@ -20,3 +20,11 @@ func TestIsLongName(t *testing.T) {
 		t.Errorf("False positive")
 	}
 }
+
+func TestRemoveLongNameSuffix(t *testing.T) {
+	filename := "gocryptfs.longname.LkwUdALvV_ANnzQN6ZZMYnxxfARD3IeZWCKnxGJjYmU=.name"
+	content := "gocryptfs.longname.LkwUdALvV_ANnzQN6ZZMYnxxfARD3IeZWCKnxGJjYmU="
+	if RemoveLongNameSuffix(filename) != content {
+		t.Error(".name suffix not removed")
+	}
+}
diff --git a/internal/nametransform/names.go b/internal/nametransform/names.go
index 20fbede..d5c2c8b 100644
--- a/internal/nametransform/names.go
+++ b/internal/nametransform/names.go
@@ -17,6 +17,17 @@ const (
 	NameMax = 255
 )
 
+// NameTransformer is an interface used to transform filenames.
+type NameTransformer interface {
+	DecryptName(cipherName string, iv []byte) (string, error)
+	EncryptName(plainName string, iv []byte) string
+	EncryptAndHashName(name string, iv []byte) (string, error)
+	HashLongName(name string) string
+	WriteLongNameAt(dirfd int, hashName string, plainName string) error
+	B64EncodeToString(src []byte) string
+	B64DecodeString(s string) ([]byte, error)
+}
+
 // NameTransform is used to transform filenames.
 type NameTransform struct {
 	emeCipher *eme.EMECipher
@@ -88,3 +99,13 @@ func (n *NameTransform) EncryptName(plainName string, iv []byte) (cipherName64 s
 	cipherName64 = n.B64.EncodeToString(bin)
 	return cipherName64
 }
+
+// B64EncodeToString returns a Base64-encoded string
+func (n *NameTransform) B64EncodeToString(src []byte) string {
+	return n.B64.EncodeToString(src)
+}
+
+// B64DecodeString decodes a Base64-encoded string
+func (n *NameTransform) B64DecodeString(s string) ([]byte, error) {
+	return n.B64.DecodeString(s)
+}
-- 
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