Login (#6)

Reviewed-on: phoenix/textsender-auth#6
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

internal/handler/login.go

@@ -0,0 +1,83 @@
+package handler
+
+import (
+	"fmt"
+	"net/http"
+
+	"git.kundeng.us/phoenix/textsender-auth/internal/config"
+	"git.kundeng.us/phoenix/textsender-auth/internal/model"
+	"git.kundeng.us/phoenix/textsender-auth/internal/utility"
+)
+
+type LoginAccount struct {
+	Username string `json:"username"`
+	Password string `json:"password"`
+}
+
+type LoginResponse struct {
+	Message string        `json:"message"`
+	Data    []model.Login `json:"data"`
+}
+
+type LoginHandler struct {
+	UserStore model.UserStore
+}
+
+func NewLoginHandler(userStore model.UserStore) *LoginHandler {
+	return &LoginHandler{UserStore: userStore}
+}
+
+func (l *LoginHandler) Login(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	var req LoginAccount
+	if err := ExtractFromRequest(r, &req); err != nil {
+		http.Error(w, "Invalid JSON: "+err.Error(), http.StatusBadRequest)
+	}
+	defer r.Body.Close()
+
+	var statusCode int
+	var resp LoginResponse
+
+	ctx := r.Context()
+
+	if exists, err := l.UserStore.UserExists(ctx, req.Username); err != nil {
+		fmt.Printf("Error: %v", err)
+		statusCode = http.StatusInternalServerError
+		resp.Message = err.Error()
+	} else {
+		if !exists {
+			statusCode = http.StatusBadRequest
+			resp.Message = "Failure in user check"
+		} else {
+			if user, err := l.UserStore.GetUserByUsername(ctx, req.Username); err != nil {
+				statusCode = http.StatusInternalServerError
+				resp.Message = err.Error()
+			} else {
+				hashing := utility.HashMash{Password: req.Password}
+				if hashing.CheckPasswordHash(req.Password, user.Password) {
+					var tokGen utility.TokenGenerator
+					secretKey := config.GetSecretKey()
+					tokGen.SetSecretKey(secretKey)
+					if token, err := tokGen.GenerateToken(*user); err != nil {
+						fmt.Println(err.Error())
+						statusCode = http.StatusInternalServerError
+						resp.Message = "Error generating token"
+					} else {
+						statusCode = http.StatusOK
+						resp.Data = append(resp.Data, *token)
+						resp.Message = "Successful"
+					}
+				} else {
+					statusCode = http.StatusNotFound
+					resp.Message = "User not found"
+				}
+			}
+		}
+	}
+
+	RespondWithJson(w, statusCode, &resp)
+}