add login method

api/auth/login.go

@@ -0,0 +1,55 @@
+package api_auth
+
+import (
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"net/http"
+
+	"git.oblat.lv/alex/triggerssmith/internal/auth"
+	"git.oblat.lv/alex/triggerssmith/internal/server"
+)
+
+type loginRequest struct {
+	Username string `json:"username"`
+	Password string `json:"password"`
+}
+
+type loginResponse struct {
+	Token string `json:"accessToken"`
+}
+
+// @Summary	Login
+// @Tags		auth
+// @Produce	json
+// @Param		request	body	loginRequest	true	"Login request"
+// @Success	200		{object}	loginResponse
+// @Failure	400	{object}	server.ProblemDetails
+// @Failure	401	{object}	server.ProblemDetails
+// @Router 	/api/auth/login [post]
+func (h *authHandler) handleLogin(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	var req loginRequest
+	err := json.NewDecoder(r.Body).Decode(&req)
+	if err != nil {
+		server.WriteProblem(w, http.StatusBadRequest, "/errors/invalid-request-body", "Invalid request body", "Body is not valid JSON", r)
+		return
+	}
+
+	tokens, err := h.a.Login(req.Username, req.Password)
+	if err != nil {
+		slog.Error("Login failed", "error", err.Error())
+		switch err {
+		case auth.ErrInvalidUsername:
+			server.WriteProblem(w, http.StatusUnauthorized, "/errors/auth/invalid-credentials", "Invalid credentials", fmt.Sprintf("User with username %s not found", req.Username), r)
+		case auth.ErrInvalidPassword:
+			server.WriteProblem(w, http.StatusUnauthorized, "/errors/auth/invalid-credentials", "Invalid credentials", fmt.Sprintf("Invalid password for user %s", req.Username), r)
+		default:
+			server.WriteProblem(w, http.StatusInternalServerError, "/errors/internal-server-error", "Internal Server Error", "unexpected error", r)
+		}
+		return
+	}
+
+	setRefreshCookie(w, tokens.Refresh, h.cfg.Auth.RefreshTokenTTL, false)
+	_ = json.NewEncoder(w).Encode(loginResponse{Token: tokens.Access})
+}