Add config

.gitignore

@@ -1,2 +1,3 @@
 notes.sqlite
 NoteServer
+config.json

main.go

@@ -6,15 +6,23 @@ import (
 	"io"
 	"log"
 	"net/http"
+	"os"
 	"strconv"
 
 	"github.com/julienschmidt/httprouter"
 	_ "github.com/mattn/go-sqlite3"
 )
 
+const configPath = "config.json"
+
 var db *sql.DB
 
-type Note struct {
+type config struct {
+	Host string `json:"host"`
+	Port int    `json:"port"`
+}
+
+type note struct {
 	Id      int64  `json:"id"`
 	Content string `json:"content"`
 }
@@ -53,14 +61,14 @@ func getNotes(w http.ResponseWriter, req *http.Request, _ httprouter.Params) {
 
 	defer res.Close()
 
-	var notes []Note = []Note{}
+	var notes []note = []note{}
 
 	for res.Next() {
 		if httpError(res.Err(), http.StatusInternalServerError, "Failed to load notes", w) {
 			return
 		}
 
-		var note Note
+		var note note
 		res.Scan(&note.Id, &note.Content)
 		notes = append(notes, note)
 	}
@@ -80,7 +88,7 @@ func postNotes(w http.ResponseWriter, req *http.Request, _ httprouter.Params) {
 		return
 	}
 
-	var note Note
+	var note note
 	err = json.Unmarshal(data, &note)
 	if httpError(err, http.StatusBadRequest, "Invalid request", w) {
 		return
@@ -129,7 +137,7 @@ func getNote(w http.ResponseWriter, req *http.Request, p httprouter.Params) {
 
 	res := stmt.QueryRow(id)
 
-	var note Note = Note{Id: id}
+	var note note = note{Id: id}
 
 	err = res.Scan(&note.Content)
 	if err == sql.ErrNoRows {
@@ -161,7 +169,7 @@ func putNote(w http.ResponseWriter, req *http.Request, p httprouter.Params) {
 		return
 	}
 
-	var note Note
+	var note note
 	err = json.Unmarshal(data, &note)
 	if httpError(err, http.StatusBadRequest, "Invalid request", w) {
 		return
@@ -204,12 +212,67 @@ func putNote(w http.ResponseWriter, req *http.Request, p httprouter.Params) {
 	w.Write(json)
 }
 
+func fileExists(path string) (bool, error) {
+	_, err := os.Stat(path)
+	if err == nil {
+		return true, nil
+	}
+
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+
+	return false, err
+}
+
+func loadConfig(path string) (config, error) {
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		return config{}, err
+	}
+
+	var cfg config = config{}
+	err = json.Unmarshal(raw, &cfg)
+	if err != nil {
+		return config{}, err
+	}
+
+	return cfg, nil
+}
+
 func main() {
+	log.Println("Loading config")
+
+	exists, err := fileExists(configPath)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	if !exists {
+		// Config etc
+		json, err := json.MarshalIndent(config{
+			Host: "localhost",
+			Port: 8080,
+		}, "", "\t")
+
+		if err != nil {
+			log.Fatalln(err)
+		}
+
+		os.WriteFile(configPath, json, 0o664)
+		log.Println("Created config.json, edit accordingly")
+		return
+	}
+
+	config, err := loadConfig(configPath)
+	if err != nil {
+		log.Fatalln(config)
+	}
+
 	log.Println("Starting NoteServer")
 
 	log.Println("Loading database")
 
-	var err error
 	db, err = sql.Open("sqlite3", "./notes.sqlite")
 	if err != nil {
 		log.Fatalln("Failed to load db:", err)
@@ -226,8 +289,8 @@ func main() {
 	router := httprouter.New()
 	router.GET("/api/notes", getNotes)
 	router.POST("/api/notes", postNotes)
-	router.GET("/api/note/:id", getNote)
+	router.GET("/api/notes/:id", getNote)
-	router.PUT("/api/note/:id", putNote)
+	router.PUT("/api/notes/:id", putNote)
 
 	http.ListenAndServe(":8080", router) // TODO: configure host, port, TLS
 }