Atul Singh
193e0d3c77
* feat: ratelimit, ghcr package and proper project refactor from askarzh * fix(bridge): validate media path * update: dependencies * fix: added LID to contact number migration
110 lines
3.1 KiB
Go
110 lines
3.1 KiB
Go
package auth
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import (
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"crypto/subtle"
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"encoding/json"
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"log/slog"
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"net/http"
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"strconv"
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"strings"
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"time"
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"whatsapp-bridge/config"
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"github.com/golang-jwt/jwt/v5"
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)
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type Claims struct {
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Service string `json:"service"`
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jwt.RegisteredClaims
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}
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func LoginHandler(cfg *config.Config) http.HandlerFunc {
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limiter, err := newLoginLimiter(cfg.AuthLoginRate)
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if err != nil {
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// Surface fatal config error at startup by returning a handler that always 500s.
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// In practice main() should call newLoginLimiter directly and exit, but keeping
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// the existing LoginHandler signature stable avoids a wider refactor in this PR.
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slog.Error("invalid AUTH_LOGIN_RATE", "err", err)
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return func(w http.ResponseWriter, r *http.Request) {
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http.Error(w, "server misconfigured", http.StatusInternalServerError)
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}
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}
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return func(w http.ResponseWriter, r *http.Request) {
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ip := clientIP(r)
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lim := limiter.get(ip)
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if !lim.Allow() {
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retry := retryAfterSeconds(lim)
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w.Header().Set("Retry-After", strconv.Itoa(retry))
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slog.Warn("login rate-limited", "remote", ip)
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http.Error(w, "Too Many Requests", http.StatusTooManyRequests)
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return
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}
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expected := []byte("Bearer " + cfg.APIKey)
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got := []byte(r.Header.Get("Authorization"))
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if subtle.ConstantTimeCompare(expected, got) != 1 {
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slog.Warn("login rejected: bad api key", "remote", r.RemoteAddr)
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http.Error(w, "Invalid credentials", http.StatusUnauthorized)
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return
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}
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claims := Claims{
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Service: "mcp-server",
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RegisteredClaims: jwt.RegisteredClaims{
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Issuer: "whatsapp-bridge",
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Audience: []string{"whatsapp-mcp-server"},
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(45 * time.Minute)),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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},
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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signed, err := token.SignedString(cfg.JWTSecret)
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if err != nil {
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slog.Error("failed to sign token", "err", err)
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http.Error(w, "Failed to generate token", http.StatusInternalServerError)
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return
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}
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json.NewEncoder(w).Encode(map[string]string{"token": signed})
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}
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}
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// JwtAuthMiddleware Protect normal API endpoints
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func JwtAuthMiddleware(cfg *config.Config, next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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auth := r.Header.Get("Authorization")
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if !strings.HasPrefix(auth, "Bearer ") {
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http.Error(w, "Missing or invalid Authorization header", http.StatusUnauthorized)
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return
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}
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tokenStr := strings.TrimPrefix(auth, "Bearer ")
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token, err := jwt.ParseWithClaims(
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tokenStr,
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&Claims{},
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func(token *jwt.Token) (interface{}, error) {
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return cfg.JWTSecret, nil
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},
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jwt.WithIssuer("whatsapp-bridge"),
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jwt.WithAudience("whatsapp-mcp-server"),
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jwt.WithValidMethods([]string{"HS256"}),
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)
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if err != nil {
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slog.Warn("jwt parse error", "err", err, "remote", r.RemoteAddr)
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http.Error(w, "Invalid or expired token", http.StatusUnauthorized)
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return
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}
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if !token.Valid {
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slog.Warn("jwt invalid", "remote", r.RemoteAddr)
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http.Error(w, "Invalid or expired token", http.StatusUnauthorized)
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return
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}
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next.ServeHTTP(w, r)
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})
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}
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