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main.go
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package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"os"
"strconv"
"strings"
"time"
"github.com/golang-jwt/jwt/v5"
"github.com/joho/godotenv"
repo "github.com/khavitidala/chirpy/internal/repositories/chirp"
)
type apiConfig struct {
fileserverHits int
jwtSecret string
}
type userPayload struct {
Email string `json:"email"`
Password string `json:"password"`
}
type loginPayload struct {
Email string `json:"email"`
Password string `json:"password"`
ExpiresInSeconds int `json:"expires_in_seconds,omitempty"`
}
func (cfg *apiConfig) middlewareMetricsInc(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
next.ServeHTTP(w, r)
cfg.fileserverHits++
})
}
func (cfg *apiConfig) metricsResetHandler() http.Handler {
return http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
cfg.fileserverHits = 0
})
}
func (cfg *apiConfig) metricsConfigHandler() http.Handler {
return http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
w.Write([]byte(fmt.Sprintf(`
<html>
<body>
<h1>Welcome, Chirpy Admin</h1>
<p>Chirpy has been visited %d times!</p>
</body>
</html>
`, cfg.fileserverHits)))
})
}
func respError(errMsg string, statusCode int, w http.ResponseWriter) {
errVal := struct {
Error string `json:"error"`
}{
Error: errMsg,
}
dat, err := json.Marshal(errVal)
if err != nil {
log.Printf("Error marshalling JSON: %s", err)
w.WriteHeader(500)
w.Write([]byte(`{"error":"Something went wrong"}`))
return
}
w.WriteHeader(statusCode)
w.Write(dat)
}
func (cfg *apiConfig) chirpsPOSTHandler(db *repo.DB, w http.ResponseWriter, r *http.Request) {
type chirpyBody struct {
Body string `json:"body"`
}
decoder := json.NewDecoder(r.Body)
chirp := chirpyBody{}
err := decoder.Decode(&chirp)
w.Header().Set("Content-Type", "application/json")
if err != nil {
log.Printf("Error decoding parameters: %s", err)
respError("Something went wrong", 500, w)
return
}
id := cfg.userAuthentication(r)
if id == -1 {
respError("Unauthorize", 401, w)
return
}
newChirp, err := db.CreateChirp(chirp.Body, id)
if err != nil {
respError(err.Error(), 400, w)
return
}
dat, err := json.Marshal(newChirp)
if err != nil {
log.Printf("Error marshalling JSON: %s", err)
respError("Something went wrong", 500, w)
return
}
w.WriteHeader(201)
w.Write(dat)
}
func (cfg *apiConfig) chirpsGETHandler(db *repo.DB, w http.ResponseWriter, r *http.Request) {
db.Mux.Lock()
chirps, err := db.GetChirps()
db.Mux.Unlock()
w.Header().Set("Content-Type", "application/json")
if err != nil {
respError(err.Error(), 400, w)
return
}
dat, err := json.Marshal(chirps)
if err != nil {
log.Printf("Error marshalling JSON: %s", err)
respError("Something went wrong", 500, w)
return
}
if id := r.PathValue("chirpID"); id != "" {
var singleChirp repo.Chirp
chirpID, err := strconv.Atoi(id)
if err != nil {
log.Fatal(err)
respError("Something went wrong", 500, w)
return
}
for _, val := range chirps {
if val.Id == chirpID {
singleChirp = val
dat, err := json.Marshal(singleChirp)
if err != nil {
log.Printf("Error marshalling JSON: %s", err)
respError("Something went wrong", 500, w)
return
}
w.WriteHeader(200)
w.Write(dat)
return
}
}
w.WriteHeader(404)
return
}
w.WriteHeader(200)
w.Write(dat)
}
func (cfg *apiConfig) usersPOSTHandler(db *repo.DB, w http.ResponseWriter, r *http.Request) {
decoder := json.NewDecoder(r.Body)
user := userPayload{}
err := decoder.Decode(&user)
w.Header().Set("Content-Type", "application/json")
if err != nil {
log.Printf("Error decoding parameters: %s", err)
respError("Something went wrong", 500, w)
return
}
newUser, err := db.CreateUser(user.Email, user.Password)
if err != nil {
respError(err.Error(), 400, w)
return
}
dat, err := json.Marshal(newUser)
if err != nil {
log.Printf("Error marshalling JSON: %s", err)
respError("Something went wrong", 500, w)
return
}
w.WriteHeader(201)
w.Write(dat)
}
func (cfg *apiConfig) userAuthentication(r *http.Request) (id int) {
id = -1
tokenRaw := r.Header.Get("Authorization")
if tokenRaw == "" {
return
}
tokenSplit := strings.Split(tokenRaw, " ")
if len(tokenSplit) != 2 {
return
}
token := tokenSplit[1]
id = cfg.jwtAuthentication(token)
return
}
func (cfg *apiConfig) jwtAuthentication(token string) (id int) {
id = -1
jwtToken, err := jwt.ParseWithClaims(token, &jwt.RegisteredClaims{}, func(token *jwt.Token) (interface{}, error) {
return []byte(cfg.jwtSecret), nil
})
if err != nil {
log.Printf("Error decoding JWT token: %s", err)
return
}
if claims, ok := jwtToken.Claims.(*jwt.RegisteredClaims); ok {
strId, _ := claims.GetSubject()
id, err = strconv.Atoi(strId)
if err != nil {
log.Printf("Error converting ID token: %s", err)
return
}
}
return
}
func (cfg *apiConfig) tokenAuthentication(db *repo.DB, tokenRaw string) (id int) {
id = -1
tokens, err := db.GetTokens()
if err != nil {
log.Println(err.Error())
return
}
_, token, err := db.GetTokenByRefreshToken(tokens, tokenRaw)
if err != nil {
log.Println(err.Error(), tokenRaw)
return
}
if !token.IsValidToken(tokenRaw) {
log.Println("invalid token " + tokenRaw)
return
}
id = token.UserId
return
}
func (cfg *apiConfig) usersPUTHandler(db *repo.DB, w http.ResponseWriter, r *http.Request) {
decoder := json.NewDecoder(r.Body)
user := userPayload{}
err := decoder.Decode(&user)
w.Header().Set("Content-Type", "application/json")
if err != nil {
log.Printf("Error decoding parameters: %s", err)
respError("Something went wrong", 500, w)
return
}
id := cfg.userAuthentication(r)
if id == -1 {
respError("Unauthorize", 401, w)
return
}
uptUser, err := db.UpdateUser(user.Email, user.Password, id)
if err != nil {
respError(err.Error(), 400, w)
return
}
dat, err := json.Marshal(uptUser)
if err != nil {
log.Printf("Error marshalling JSON: %s", err)
respError("Something went wrong", 500, w)
return
}
w.WriteHeader(200)
w.Write(dat)
}
func (cfg *apiConfig) loginHandler(db *repo.DB, w http.ResponseWriter, r *http.Request) {
decoder := json.NewDecoder(r.Body)
user := loginPayload{}
err := decoder.Decode(&user)
w.Header().Set("Content-Type", "application/json")
if err != nil {
log.Printf("Error decoding parameters: %s", err)
respError("Something went wrong", 500, w)
return
}
users, err := db.GetUsers()
if err != nil {
log.Printf("Error get all users: %s", err)
respError("Something went wrong", 404, w)
return
}
_, authUser, err := db.GetUserByEmail(users, user.Email)
if err != nil {
respError(err.Error(), 401, w)
return
}
userResp, err := db.AuthUserByPassword(user.Password, authUser)
if err != nil {
respError(err.Error(), 401, w)
return
}
token, err := cfg.constructJWT(authUser.Id, 1*time.Hour)
if err != nil {
respError(err.Error(), 401, w)
return
}
refreshToken, err := db.GetOrCreateRefreshToken(authUser.Id)
if err != nil {
respError(err.Error(), 401, w)
return
}
jwtResp := repo.JWTUserResponse{
Id: userResp.Id,
Email: userResp.Email,
Token: token,
RefreshToken: refreshToken.Token,
}
dat, err := json.Marshal(jwtResp)
if err != nil {
log.Printf("Error marshalling JSON: %s", err)
respError("Something went wrong", 500, w)
return
}
w.WriteHeader(200)
w.Write(dat)
}
func (cfg *apiConfig) refreshTokenHandler(db *repo.DB, w http.ResponseWriter, r *http.Request) {
tokenRaw := r.Header.Get("Authorization")
if tokenRaw == "" {
respError("Unauthorized", 401, w)
return
}
tokenSplit := strings.Split(tokenRaw, " ")
if len(tokenSplit) != 2 {
respError("Unauthorized", 401, w)
return
}
token := tokenSplit[1]
id := cfg.tokenAuthentication(db, token)
if id == -1 {
respError("Unauthorized", 401, w)
return
}
jwtToken, err := cfg.constructJWT(id, 1*time.Hour)
if err != nil {
respError(err.Error(), 401, w)
return
}
jwtResp := struct {
Token string `json:"token"`
}{
Token: jwtToken,
}
dat, err := json.Marshal(jwtResp)
if err != nil {
log.Printf("Error marshalling JSON: %s", err)
respError("Something went wrong", 500, w)
return
}
w.WriteHeader(200)
w.Write(dat)
}
func (cfg *apiConfig) revokeTokenHandler(db *repo.DB, w http.ResponseWriter, r *http.Request) {
tokenRaw := r.Header.Get("Authorization")
if tokenRaw == "" {
respError("Unauthorized", 401, w)
return
}
tokenSplit := strings.Split(tokenRaw, " ")
if len(tokenSplit) != 2 {
respError("Unauthorized", 401, w)
return
}
token := tokenSplit[1]
id := cfg.tokenAuthentication(db, token)
if id == -1 {
respError("Unauthorized", 401, w)
return
}
err := db.RevokeToken(token)
if err != nil {
respError(err.Error(), 401, w)
return
}
w.WriteHeader(204)
}
func (cfg *apiConfig) constructJWT(id int, expInDuration time.Duration) (string, error) {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.RegisteredClaims{
Issuer: "chirpy",
IssuedAt: jwt.NewNumericDate(time.Now()),
ExpiresAt: jwt.NewNumericDate(time.Now().Add(expInDuration)),
Subject: strconv.Itoa(id),
})
return token.SignedString([]byte(cfg.jwtSecret))
}
func (cfg *apiConfig) chirpsDELETEHandler(db *repo.DB, w http.ResponseWriter, r *http.Request) {
id := cfg.userAuthentication(r)
if id == -1 {
respError("Unauthorize", 403, w)
return
}
chirpID := r.PathValue("chirpID")
if chirpID == "" {
respError("Bad Request", 400, w)
return
}
chirpIDcasted, err := strconv.Atoi(chirpID)
if err != nil {
log.Println(err)
respError("Something went wrong", 500, w)
return
}
is_deleted, err := db.DeleteChirp(chirpIDcasted, id)
if err != nil {
log.Println(err)
respError("Something went wrong", 500, w)
return
}
if !is_deleted {
respError("Unauthorize", 403, w)
return
}
w.WriteHeader(204)
}
func main() {
godotenv.Load()
cfg := &apiConfig{fileserverHits: 0, jwtSecret: os.Getenv("JWT_SECRET")}
db, err := repo.NewDB("database.json")
if err != nil {
log.Fatal(err)
os.Exit(1)
}
mux := http.NewServeMux()
mux.HandleFunc("GET /api/healthz/", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(http.StatusOK)
w.Write([]byte("OK"))
})
mux.Handle("GET /app/", cfg.middlewareMetricsInc(http.StripPrefix("/app/", http.FileServer(http.Dir(".")))))
mux.Handle("/admin/metrics", cfg.metricsConfigHandler())
mux.Handle("/api/reset", cfg.metricsResetHandler())
mux.HandleFunc("POST /api/chirps", func(w http.ResponseWriter, r *http.Request) { cfg.chirpsPOSTHandler(db, w, r) })
mux.HandleFunc("GET /api/chirps", func(w http.ResponseWriter, r *http.Request) { cfg.chirpsGETHandler(db, w, r) })
mux.HandleFunc("GET /api/chirps/{chirpID}", func(w http.ResponseWriter, r *http.Request) { cfg.chirpsGETHandler(db, w, r) })
mux.HandleFunc("POST /api/users", func(w http.ResponseWriter, r *http.Request) { cfg.usersPOSTHandler(db, w, r) })
mux.HandleFunc("PUT /api/users", func(w http.ResponseWriter, r *http.Request) { cfg.usersPUTHandler(db, w, r) })
mux.HandleFunc("POST /api/login", func(w http.ResponseWriter, r *http.Request) { cfg.loginHandler(db, w, r) })
mux.HandleFunc("POST /api/refresh", func(w http.ResponseWriter, r *http.Request) { cfg.refreshTokenHandler(db, w, r) })
mux.HandleFunc("POST /api/revoke", func(w http.ResponseWriter, r *http.Request) { cfg.revokeTokenHandler(db, w, r) })
mux.HandleFunc("DELETE /api/chirps/{chirpID}", func(w http.ResponseWriter, r *http.Request) { cfg.chirpsDELETEHandler(db, w, r) })
serv := &http.Server{
Addr: ":8080",
Handler: mux,
}
log.Fatal(serv.ListenAndServe())
}