feat: login post handler

internal/user/routes.go

@@ -3,11 +3,15 @@ package user
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"net/http"
+	"time"
 
+	"gitea.local/admin/hspguard/internal/auth"
 	"gitea.local/admin/hspguard/internal/repository"
 	"gitea.local/admin/hspguard/internal/web"
 	"github.com/go-chi/chi/v5"
+	"github.com/golang-jwt/jwt/v5"
 )
 
 type UserHandler struct {
@@ -24,6 +28,7 @@ func (h *UserHandler) RegisterRoutes(router chi.Router, api chi.Router) {
 	router.Get("/login", h.loginPage)
 	router.Get("/register", h.registerPage)
 	api.Post("/register", h.register)
+	api.Post("/login", h.login)
 }
 
 func (h *UserHandler) loginPage(w http.ResponseWriter, r *http.Request) {
@@ -92,3 +97,63 @@ func (h *UserHandler) register(w http.ResponseWriter, r *http.Request) {
 		web.Error(w, "failed to encode response", http.StatusInternalServerError)
 	}
 }
+
+type LoginParams struct {
+	Email       string `json:"email"`
+	Password    string `json:"password"`
+}
+
+type UserClaims struct {
+	UserID string `json:"user_id"`
+	// Role
+	jwt.RegisteredClaims
+}
+
+func (h *UserHandler) login(w http.ResponseWriter, r *http.Request) {
+	var params LoginParams
+
+	decoder := json.NewDecoder(r.Body)
+	if err := decoder.Decode(&params); err != nil {
+		web.Error(w, "failed to parse request body", http.StatusBadRequest)
+		return
+	}
+
+	if params.Email == "" || params.Password == "" {
+		web.Error(w, "missing required fields", http.StatusBadRequest)
+		return
+	}
+
+	user, err := h.repo.FindUserEmail(context.Background(), params.Email)
+	if err != nil {
+		web.Error(w, "user with provided email does not exists", http.StatusBadRequest)
+		return
+	}
+
+	claims := UserClaims{
+		UserID: user.ID.String(),
+		RegisteredClaims: jwt.RegisteredClaims{
+			Issuer: "hspguard",
+			Subject: user.Email,
+			IssuedAt: jwt.NewNumericDate(time.Now()),
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Hour)),
+		},
+	}
+
+	token, err := auth.SignJwtToken(claims)
+	if err != nil {
+		web.Error(w, fmt.Sprintf("failed to generate access token: %v", err), http.StatusBadRequest)
+		return
+	}
+
+	encoder := json.NewEncoder(w)
+
+	type Response struct {
+		Token string `json:"token"`
+	}
+
+	if err := encoder.Encode(Response{
+		Token: token,
+	}); err != nil {
+		web.Error(w, "failed to encode response", http.StatusInternalServerError)
+	}
+}