Add export, improve config saving

TODO.md

@@ -1,13 +1,11 @@
 # TODO
 List of things to add to this project
 
-## Crucial
-* Add export feature
+* Use reflection in config loading
+* Check export function for improvements
 * Add missing frontend pages
 * More slog.Debug?
-
-## Long-medium term considerations
-* Make the CLI better
+* Make the CLI multi-functional - export to path, edit file etc.
 * Think about timezones
 * Consider more secure auth methods
 * *Go* dependency-less? <-- this is a terrible idea

config.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"reflect"
 	"strconv"
 	"strings"
 )
@@ -13,18 +14,25 @@ import (
 var ConfigFile = "config/config.txt"
 
 type Config struct {
-	Username string
-	Password string
-	Port     int
+	Username string `config:"username"`
+	Password string `config:"password"`
+	Port     int    `config:"port"`
 
-	TelegramToken string
-	TelegramChat  string
+	TelegramToken string `config:"tg_token"`
+	TelegramChat  string `config:"tg_chat"`
 }
 
 func (c *Config) Save() error {
-	output := fmt.Sprintf("port=%d\nusername=%s\npassword=%s", c.Port, c.Username, c.Password)
-	if c.TelegramToken != "" && c.TelegramChat != "" {
-		output += fmt.Sprintf("\ntg_token=%s\ntg_chat=%s", c.TelegramToken, c.TelegramChat)
+	output := ""
+
+	v := reflect.ValueOf(*c)
+	typeOfS := v.Type()
+	for i := 0; i < v.NumField(); i++ {
+		key := typeOfS.Field(i).Tag.Get("config")
+		value := v.Field(i).Interface()
+		if value != "" {
+			output += fmt.Sprintf("%s=%v\n", key, value)
+		}
 	}
 
 	f, err := os.OpenFile(ConfigFile, os.O_CREATE|os.O_WRONLY, 0644)

config/config.txt

@@ -1,3 +1,3 @@
-port=7101
 username=admin
 password=admin
+port=7101

export.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"archive/zip"
+	"io"
+	"log/slog"
+	"net/http"
+	"os"
+	"path/filepath"
+)
+
+var ExportPath = "data/export.zip"
+
+func Export(filename string) error {
+	file, err := os.Create(filename)
+	if err != nil {
+		slog.Error("error creating export archive", "error", err)
+		return err
+	}
+	defer file.Close()
+
+	w := zip.NewWriter(file)
+	defer w.Close()
+
+	walker := func(path string, info os.FileInfo, err error) error {
+		if path == filename { // Do not add export .zip itself
+			return nil
+		}
+		slog.Debug("export crawling", "path", path)
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			return nil
+		}
+		file, err := os.Open(path)
+		if err != nil {
+			return err
+		}
+		defer file.Close()
+
+		f, err := w.Create(path)
+		if err != nil {
+			return err
+		}
+
+		_, err = io.Copy(f, file)
+		if err != nil {
+			return err
+		}
+
+		return nil
+	}
+	err = filepath.Walk("data/", walker)
+	if err != nil {
+		slog.Error("error walking files", "error", err)
+		return err
+	}
+
+	return nil
+}
+
+// GetExport returns a .zip archive with contents of the data folder
+func GetExport(w http.ResponseWriter, r *http.Request) {
+	err := Export(ExportPath)
+	if err != nil {
+		http.Error(w, "could not export", http.StatusInternalServerError)
+		return
+	}
+	http.ServeFile(w, r, "data/export.zip")
+}

serve.go

@@ -41,6 +41,8 @@ func Serve() {
 	apiRouter.Get("/today", GetToday)
 	apiRouter.Post("/today", PostToday)
 
+	apiRouter.Get("/export", GetExport)
+
 	r.Mount("/api", apiRouter)
 
 	// Static files