How to Unzip Password-Protected ZIP Files in Go 1.2?

Unzipping Password-Protected ZIP Files in Go 1.2

The archive/zip package in Go 1.2 provides basic functionality for handling ZIP archives but lacks support for password protection. To unzip a ZIP file protected by a password, one can utilize the os/exec package to invoke an external tool such as 7zip.

To do so, follow these steps:

1. Create a Password-Protected ZIP File: Create a sample ZIP file using the 7zip tool, specifying the password and encryption algorithm:

7za a sample.zip name.txt -p"your_password" -mem=AES256

2. Extract the ZIP File with Password: Use the following code to extract the password-protected ZIP file:

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

func extractZipWithPassword() {
    fmt.Printf("Unzipping `%s` to directory `%s`\n", zip_path, extract_path)
    commandString := fmt.Sprintf(`7za e %s -o%s -p"%s" -aoa`, zip_path, extract_path, zip_password)
    commandSlice := strings.Fields(commandString)
    fmt.Println(commandString)
    c := exec.Command(commandSlice[0], commandSlice[1:]...)
    e := c.Run()
    checkError(e)
}</code>

In this code snippet:

• zip_path is the path to the password-protected ZIP file.
• extract_path is the path to the directory where the extracted files will be saved.
• zip_password is the password for the ZIP file.

3. Example Program: Use the following complete example program to demonstrate the process:

<code class="go">// Shows how to extract an passsword encrypted zip file using 7zip.
// By Larry Battle <https://github.com/LarryBattle>
// Answer to http://stackoverflow.com/questions/20330210/golang-1-2-unzip-password-protected-zip-file
// 7-zip.chm - http://sevenzip.sourceforge.jp/chm/cmdline/switches/index.htm
// Effective Golang - http://golang.org/doc/effective_go.html
package main

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

// ...

func main() {
    // ...
    extractZipWithPassword()
    // ...
}</code>

4. Run the Program: Compile and run the example program:

go run main.go

The program will extract the password-protected ZIP file to the specified directory.

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