How to Extract Password-Protected ZIP Files in Golang 1.2 without Native Support?

Extracting Password-Protected ZIP Files in Golang 1.2 without Native Support

While the archive/zip package in Go 1.2 provides basic ZIP functionality, it lacks mechanisms for handling password-protected archives. To fill this gap, the recommended approach is to leverage the os/exec package and utilize an external tool like 7-zip to perform the extraction.

Using 7-zip to Extract Password-Protected ZIP Files

7-zip offers robust command-line capabilities for manipulating archives, including password-protected ZIP files. Here's how you can achieve this in Go using os/exec:

<code class="go">import (
    "os/exec"
    "fmt"
)

func extractZipWith7zip(zipPath, extractPath, password string) {
    cmdString := fmt.Sprintf("7za e %s -o%s -p%s", zipPath, extractPath, password)
    cmd := exec.Command("7za", strings.Fields(cmdString)...)
    err := cmd.Run()
    if err != nil {
        panic(err)
    }
}</code>

Example Program

The following Go program demonstrates the entire process of creating a password-protected ZIP file, extracting it using 7-zip, and verifying the extracted content:

<code class="go">package main

import (
    "fmt"
    "os"
    "os/exec"
    "path/filepath"
    "strings"
)

var (
    originalText = "Sample file created"
    txtFilename  = "name.txt"
    zipFilename  = "sample.zip"
    zipPassword  = "42"

    dirPath = "./test"
    srcPath = filepath.Join(dirPath, "src")
    extractPath = filepath.Join(dirPath, "extracted")
    txtPath = filepath.Join(srcPath, txtFilename)
    zipPath = filepath.Join(srcPath, zipFilename)
)

func main() {
    fmt.Println("# Setup")
    setupTestDirectory()
    createSampleFile()
    createZipWithPassword()
    fmt.Println("# Extraction of password-protected ZIP...")
    extractZipWithPassword()
    verifyExtractedFile()
    fmt.Println("Done.")
}

func setupTestDirectory() {
    os.RemoveAll(dirPath)
    os.MkdirAll(srcPath, os.ModePerm)
    os.MkdirAll(extractPath, os.ModePerm)
}

func createSampleFile() {
    file, err := os.Create(txtPath)
    if err != nil {
        panic(err)
    }
    defer file.Close()
    _, err = file.WriteString(originalText)
    if err != nil {
        panic(err)
    }
}

func createZipWithPassword() {
    cmdString := fmt.Sprintf("7za a %s %s -p%s", zipPath, txtPath, zipPassword)
    cmd := exec.Command("7za", strings.Fields(cmdString)...)
    err := cmd.Run()
    if err != nil {
        panic(err)
    }
}

func extractZipWithPassword() {
    cmdString := fmt.Sprintf("7za e %s -o%s -p%s", zipPath, extractPath, zipPassword)
    cmd := exec.Command("7za", strings.Fields(cmdString)...)
    err := cmd.Run()
    if err != nil {
        panic(err)
    }
}

func verifyExtractedFile() {
    extractedPath := filepath.Join(extractPath, txtFilename)
    content, err := os.ReadFile(extractedPath)
    if err != nil {
        panic(err)
    }
    if string(content) != originalText {
        panic("Extracted content mismatch")
    }
}</code>

Note: Make sure 7-zip is installed on your system and included in your system's path for this approach to work.

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