feat: unzip theme

cmd/anna/theme.go

@@ -0,0 +1,101 @@
+package anna
+
+import (
+	"archive/zip"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+var (
+	baseURL = "https://github.com/anna-ssg/themes/releases/download"
+	tagVer  = "v2.0"
+	destDir = "site"
+)
+
+// DownloadTheme downloads and extracts a theme from a URL based on themeName.
+func DownloadTheme(themeName string) error {
+	zipURL := fmt.Sprintf("%s/%s/%s.zip", baseURL, tagVer, themeName)
+	zipFile := fmt.Sprintf("%s.zip", themeName)
+
+	fmt.Printf("Downloading %s...\n", zipURL)
+	if err := downloadFile(zipURL, zipFile); err != nil {
+		return fmt.Errorf("error downloading theme '%s': %v", themeName, err)
+	}
+
+	fmt.Println("Extracting files...")
+	if err := unzip(zipFile, destDir); err != nil {
+		return fmt.Errorf("error extracting files: %v", err)
+	}
+
+	fmt.Printf("Theme '%s' extracted to '%s' directory successfully.\n", themeName, destDir)
+
+	if err := os.Remove(zipFile); err != nil {
+		fmt.Printf("Warning: error deleting zip file '%s': %v\n", zipFile, err)
+	}
+
+	return nil
+}
+
+// downloadFile downloads a file from a URL and saves it to filepath.
+func downloadFile(url, filepath string) error {
+	resp, err := http.Get(url)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	out, err := os.Create(filepath)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	_, err = io.Copy(out, resp.Body)
+	return err
+}
+
+// unzip extracts a zip file (src) to a destination directory (dest).
+func unzip(src, dest string) error {
+	r, err := zip.OpenReader(src)
+	if err != nil {
+		return err
+	}
+	defer r.Close()
+
+	for _, f := range r.File {
+		rc, err := f.Open()
+		if err != nil {
+			return err
+		}
+		defer rc.Close()
+
+		fpath := filepath.Join(dest, f.Name)
+
+		// Ensure extraction path is safe
+		if !strings.HasPrefix(fpath, filepath.Clean(dest)+string(os.PathSeparator)) {
+			return fmt.Errorf("%s: illegal file path", fpath)
+		}
+
+		if f.FileInfo().IsDir() {
+			os.MkdirAll(fpath, os.ModePerm)
+		} else {
+			if err := os.MkdirAll(filepath.Dir(fpath), os.ModePerm); err != nil {
+				return err
+			}
+			outFile, err := os.OpenFile(fpath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
+			if err != nil {
+				return err
+			}
+			defer outFile.Close()
+			_, err = io.Copy(outFile, rc)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}