github.com/cloudfoundry/libcfbuildpack@v1.91.23/helper/extract_zip.go (about) 1 /* 2 * Copyright 2018-2020 the original author or authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * https://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package helper 18 19 import ( 20 "archive/zip" 21 "os" 22 ) 23 24 // ExtractZip extracts source ZIP file to a destination directory. An arbitrary number of top-level directory 25 // components can be stripped from each path. 26 func ExtractZip(source string, destination string, stripComponents int) error { 27 z, err := zip.OpenReader(source) 28 if err != nil { 29 return err 30 } 31 defer z.Close() 32 33 for _, f := range z.File { 34 target := strippedPath(f.Name, destination, stripComponents) 35 if target == "" { 36 continue 37 } 38 39 if f.FileInfo().IsDir() { 40 if err := os.MkdirAll(target, 0755); err != nil { 41 return err 42 } 43 } else { 44 if err := writeFile(f, target); err != nil { 45 return err 46 } 47 } 48 } 49 50 return nil 51 } 52 53 func writeFile(file *zip.File, target string) error { 54 in, err := file.Open() 55 if err != nil { 56 return err 57 } 58 defer in.Close() 59 60 return WriteFileFromReader(target, file.Mode(), in) 61 }