Added Configuration Management

.gitignore

@@ -1,3 +1,3 @@
-database.db
+appdata
 .idea
 *.exe

config/config.go

@@ -0,0 +1,56 @@
+package config
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	Port         string `yaml:"port"`
+	DatabasePath string `yaml:"database_path"`
+}
+
+const configPath = "./appdata/config.yaml"
+
+func CheckIfExists() error {
+	_, err := os.Stat(configPath)
+	if err == nil {
+		return nil
+	}
+
+	if !os.IsNotExist(err) {
+		return err
+	}
+
+	log.Printf("Config file %s doesn't exist, creating...", configPath)
+	err = os.MkdirAll(filepath.Dir(configPath), 0755)
+	if err != nil {
+		return err
+	}
+
+	defaultConfig := Config{
+		Port:         "8080",
+		DatabasePath: "./appdata/database.db",
+	}
+
+	data, err := yaml.Marshal(defaultConfig)
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(configPath, data, 0644)
+}
+func LoadConfig() (Config, error) {
+	var cfg Config
+
+	file, err := os.ReadFile(configPath)
+	if err != nil {
+		return cfg, err
+	}
+
+	err = yaml.Unmarshal(file, &cfg)
+	return cfg, err
+}

go.mod

@@ -4,8 +4,10 @@ go 1.26.0
 
 require (
 	github.com/glebarez/go-sqlite v1.22.0
+	github.com/golang-jwt/jwt/v5 v5.3.1
 	github.com/google/uuid v1.6.0
 	golang.org/x/crypto v0.48.0
+	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (

go.sum

@@ -2,6 +2,8 @@ github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkp
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/glebarez/go-sqlite v1.22.0 h1:uAcMJhaA6r3LHMTFgP0SifzgXg46yJkgxqyuyec+ruQ=
 github.com/glebarez/go-sqlite v1.22.0/go.mod h1:PlBIdHe0+aUEFn+r2/uthrWq4FxbzugL0L8Li6yQJbc=
+github.com/golang-jwt/jwt/v5 v5.3.1 h1:kYf81DTWFe7t+1VvL7eS+jKFVWaUnK9cB1qbwn63YCY=
+github.com/golang-jwt/jwt/v5 v5.3.1/go.mod h1:fxCRLWMO43lRc8nhHWY6LGqRcf+1gQWArsqaEUEa5bE=
 github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26 h1:Xim43kblpZXfIBQsbuBVKCudVG457BR2GZFIz3uw3hQ=
 github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26/go.mod h1:dDKJzRmX4S37WGHujM7tX//fmj1uioxKzKxz3lo4HJo=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
@@ -15,6 +17,10 @@ golang.org/x/crypto v0.48.0/go.mod h1:r0kV5h3qnFPlQnBSrULhlsRfryS2pmewsg+XfMgkVo
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
 golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 modernc.org/libc v1.37.6 h1:orZH3c5wmhIQFTXF+Nt+eeauyd+ZIt2BX6ARe+kD+aw=
 modernc.org/libc v1.37.6/go.mod h1:YAXkAZ8ktnkCKaN9sw/UDeUVkGYJ/YquGO4FTi5nmHE=
 modernc.org/mathutil v1.6.0 h1:fRe9+AmYlaej+64JsEEhoWuAYBkOtQiMEU7n/XgfYi4=

main.go

@@ -2,20 +2,21 @@ package main
 
 import (
 	"log"
-	"net/http"
-	"shap-planner-backend/handlers"
+	"shap-planner-backend/server"
 	"shap-planner-backend/storage"
 )
 
 func main() {
-	err := storage.InitDB("database.db")
+	var SERVER = server.InitServer()
+
+	err := storage.InitDB(SERVER.DatabasePath)
 	if err != nil {
 		log.Fatal(err)
 	}
 
-	http.HandleFunc("/register", handlers.Register)
-	http.HandleFunc("/login", handlers.Login)
-
-	log.Println("Server läuft auf :8080")
-	log.Fatal(http.ListenAndServe(":8080", nil))
+	SERVER.Run()
+}
+
+func Setup() {
+	//TODO: first configuration
 }

server/server.go

@@ -0,0 +1,50 @@
+package server
+
+import (
+	"log"
+	"net/http"
+	"os"
+	"shap-planner-backend/config"
+	"shap-planner-backend/handlers"
+)
+
+type Server struct {
+	Port         string
+	JWTSecret    []byte
+	DatabasePath string
+}
+
+func InitServer() *Server {
+
+	err := config.CheckIfExists()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	cfg, err := config.LoadConfig()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	jwtSecret := os.Getenv("SHAP_JWT_SECRET")
+	if jwtSecret == "" {
+		log.Fatal("SHAP_JWT_SECRET environment variable not set.")
+	}
+	if len(jwtSecret) < 32 {
+		log.Fatal("SHAP_JWT_SECRET must be at least 32 characters long.")
+	}
+
+	return &Server{
+		Port:         cfg.Port,
+		JWTSecret:    []byte(jwtSecret),
+		DatabasePath: cfg.DatabasePath,
+	}
+}
+
+func (server *Server) Run() {
+	http.HandleFunc("/register", handlers.Register)
+	http.HandleFunc("/login", handlers.Login)
+
+	log.Printf("Listening on port %s", server.Port)
+	log.Fatal(http.ListenAndServe(":"+server.Port, nil))
+}

utils/util.go

@@ -1,20 +1,53 @@
 package utils
 
 import (
+	"os"
+	"time"
+
+	"crypto/rand"
+	"encoding/base64"
+
+	"github.com/golang-jwt/jwt/v5"
 	"github.com/google/uuid"
 	"golang.org/x/crypto/bcrypt"
 )
 
+var secret = []byte(os.Getenv("SHAP_JWT_SECRET"))
+
+// Password Validation
 func HashPassword(password string) (string, error) {
 	bytes, err := bcrypt.GenerateFromPassword([]byte(password), 14)
 	return string(bytes), err
 }
-
 func CheckPasswordHash(password, hash string) bool {
 	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
 	return err == nil
 }
 
+// JWT Validation
+func GenerateJWT(userID string) (string, error) {
+	claims := jwt.MapClaims{
+		"userId": userID,
+		"exp":    time.Now().Add(time.Hour * 1).Unix(),
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString(secret)
+}
+func ValidateJWT(tokenString string) (*jwt.Token, error) {
+	return jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
+		return secret, nil
+	})
+}
+
 func GenerateUUID() string {
 	return uuid.New().String()
 }
+func GenerateSecret() string {
+	b := make([]byte, 64)
+	_, err := rand.Read(b)
+	if err != nil {
+		return err.Error()
+	}
+	return base64.StdEncoding.EncodeToString(b)
+}