Refactored config system again

app/util.go

@@ -2,11 +2,44 @@ package app
 
 import (
 	"fmt"
+	"io"
+	"net/http"
 	"os"
+	"os/user"
+	"strconv"
+	"strings"
 
 	"github.com/spf13/cobra"
 )
 
+var SourceCertmanRepo = "http://127.0.0.1"
+
+type GiteaRelease struct {
+	Id     int     `json:"id"`
+	Assets []Asset `json:"assets"`
+}
+type Asset struct {
+	Id   int    `json:"id"`
+	Name string `json:"name"`
+}
+
+func GetUserIds(username string) (int, int, error) {
+	userEntry, err := user.Lookup(username)
+	if err != nil {
+		return -1, -1, fmt.Errorf("error getting user %s: %v", username, err)
+	}
+	uid, err := strconv.Atoi(strings.TrimSpace(userEntry.Uid))
+	if err != nil {
+		return -1, -1, err
+	}
+	gid, err := strconv.Atoi(strings.TrimSpace(userEntry.Gid))
+	if err != nil {
+		return -1, -1, err
+	}
+
+	return uid, gid, nil
+}
+
 func createFile(fileName string, filePermission os.FileMode, data []byte) {
 	fileInfo, err := os.Stat(fileName)
 	if err != nil {
@@ -49,6 +82,45 @@ func createFile(fileName string, filePermission os.FileMode, data []byte) {
 	}
 }
 
+// downloadFile streams data from a URL and saves it directly to a local file path
+func downloadFile(filepath string, url string) error {
+	// 1. Send the HTTP GET request
+	resp, err := http.Get(url)
+	if err != nil {
+		return err
+	}
+	// Always close the response body to prevent resource leaks
+	defer resp.Body.Close()
+
+	// 2. Check for a valid HTTP 200 OK status code
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("bad status: %s", resp.Status)
+	}
+
+	// 3. Create the local destination file
+	out, err := os.Create(filepath)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+	uid, gid, err := GetUserIds("certman")
+	if err != nil {
+		return err
+	}
+	err = out.Chown(uid, gid)
+	if err != nil {
+		return err
+	}
+	err = out.Chmod(775)
+	if err != nil {
+		return err
+	}
+
+	// 4. Stream the server response body directly into the local file
+	_, err = io.Copy(out, resp.Body)
+	return err
+}
+
 func basicCmd(use, short string, commandFunc func(cmd *cobra.Command, args []string)) *cobra.Command {
 	return &cobra.Command{
 		Use:   use,