forked from sassoftware/relic
/
mangle.go
85 lines (79 loc) · 1.78 KB
/
mangle.go
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//
// Copyright (c) SAS Institute Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package vsix
import (
"crypto"
"io"
"path"
"strings"
"github.com/sassoftware/relic/lib/signappx"
"github.com/sassoftware/relic/lib/zipslicer"
)
type mangler struct {
m *zipslicer.Mangler
digests map[string][]byte
ctypes *signappx.ContentTypes
hash crypto.Hash
}
func mangleZip(r io.Reader, hash crypto.Hash) (*mangler, error) {
inz, err := zipslicer.ReadZipTar(r)
if err != nil {
return nil, err
}
m := &mangler{
digests: make(map[string][]byte),
ctypes: signappx.NewContentTypes(),
hash: hash,
}
zm, err := inz.Mangle(func(f *zipslicer.MangleFile) error {
if keepFile(f.Name) {
sum, err := f.Digest(hash)
if err != nil {
return err
}
m.digests[f.Name] = sum
return nil
} else {
if f.Name == contentTypesPath {
if err := m.parseTypes(f); err != nil {
return err
}
}
f.Delete()
}
return nil
})
if err != nil {
return nil, err
}
m.m = zm
return m, nil
}
func keepFile(fp string) bool {
switch fp {
case rootRelsPath + "/", contentTypesPath:
return false
}
switch path.Ext(fp) {
case ".rels", ".psdsxs", ".psdor":
return false
}
switch {
case strings.HasPrefix(fp, digSigPath+"/"):
return false
}
return true
}