enbas/internal/utilities/file.go

// SPDX-FileCopyrightText: 2024 Dan Anglin <d.n.i.anglin@gmail.com>
//
// SPDX-License-Identifier: GPL-3.0-or-later

package utilities

import (
	"errors"
	"fmt"
	"io"
	"net/http"
	"os"
	"time"
)

func ReadFile(path string) (string, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		return "", fmt.Errorf("unable to read the data from the file: %w", err)
	}

	return string(data), nil
}

func FileExists(path string) (bool, error) {
	if _, err := os.Stat(path); err != nil {
		if errors.Is(err, os.ErrNotExist) {
			return false, nil
		}

		return false, fmt.Errorf("unable to check if the file exists: %w", err)
	}

	return true, nil
}

// TODO: move to client package
func DownloadFile(url, path string) error {
	client := http.Client{
		CheckRedirect: func(r *http.Request, _ []*http.Request) error {
			r.URL.Opaque = r.URL.Path

			return nil
		},
		Timeout: time.Second * 30,
	}

	resp, err := client.Get(url)
	if err != nil {
		return fmt.Errorf("unable to download the file: %w", err)
	}
	defer resp.Body.Close()

	file, err := os.Create(path)
	if err != nil {
		return fmt.Errorf("unable to create %s: %w", path, err)
	}
	defer file.Close()

	if _, err = io.Copy(file, resp.Body); err != nil {
		return fmt.Errorf("unable to save the download to %s: %w", path, err)
	}

	return nil
}