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package api
import (
"context"
"encoding/json"
"log"
"net/http"
"time"
"wikiapiserver/db"
)
const defaultTimeout = 5 * time.Second
// Handler holds the DB dependency for all HTTP handlers.
type Handler struct {
db *db.DB
}
// NewHandler creates a Handler backed by the given DB.
func NewHandler(database *db.DB) *Handler {
return &Handler{db: database}
}
// --- request/response types ---
type errResp struct {
Error string `json:"error"`
}
type registerReq struct {
Username string `json:"username"`
Password string `json:"password"`
}
type loginReq struct {
Username string `json:"username"`
Password string `json:"password"`
}
type refreshReq struct {
RefreshToken string `json:"refresh_token"`
}
// --- helper writers ---
func writeJSON(w http.ResponseWriter, code int, v any) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(code)
json.NewEncoder(w).Encode(v) //nolint:errcheck
}
func badRequest(w http.ResponseWriter, msg string) {
writeJSON(w, http.StatusBadRequest, errResp{Error: msg})
}
func unauthorized(w http.ResponseWriter) {
writeJSON(w, http.StatusUnauthorized, errResp{Error: "unauthorized"})
}
func serverError(w http.ResponseWriter, msg string) {
writeJSON(w, http.StatusInternalServerError, errResp{Error: msg})
}
// --- Register: POST /register ---
func (h *Handler) Register(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithTimeout(r.Context(), defaultTimeout)
defer cancel()
var req registerReq
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
badRequest(w, "invalid JSON")
return
}
if req.Username == "" || req.Password == "" {
badRequest(w, "username and password are required")
return
}
acct, err := h.db.Register(ctx, req.Username, req.Password)
if err != nil {
if err.Error() == "username already exists" {
badRequest(w, "username already exists")
return
}
log.Printf("register error: %v", err)
serverError(w, "could not create account")
return
}
writeJSON(w, http.StatusCreated, acct)
}
// --- Login: POST /login ---
func (h *Handler) Login(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithTimeout(r.Context(), defaultTimeout)
defer cancel()
var req loginReq
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
badRequest(w, "invalid JSON")
return
}
if req.Username == "" || req.Password == "" {
badRequest(w, "username and password are required")
return
}
acct, err := h.db.Authenticate(ctx, req.Username, req.Password)
if err != nil {
if err.Error() == "invalid credentials" {
unauthorized(w)
return
}
serverError(w, "authentication failed")
return
}
writeJSON(w, http.StatusOK, acct)
}
// --- Refresh: POST /refresh ---
func (h *Handler) Refresh(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithTimeout(r.Context(), defaultTimeout)
defer cancel()
var req refreshReq
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
badRequest(w, "invalid JSON")
return
}
if req.RefreshToken == "" {
badRequest(w, "refresh_token is required")
return
}
acct, err := h.db.RefreshByToken(ctx, req.RefreshToken)
if err != nil {
if err.Error() == "invalid refresh token" {
unauthorized(w)
return
}
serverError(w, "could not refresh token")
return
}
writeJSON(w, http.StatusOK, acct)
}
// --- Health: GET /health ---
func (h *Handler) Health(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithTimeout(r.Context(), defaultTimeout)
defer cancel()
if err := h.db.Ping(ctx); err != nil {
writeJSON(w, http.StatusServiceUnavailable, errResp{Error: "database unavailable"})
return
}
writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
}
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