54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
package web
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import (
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"context"
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"fmt"
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"net/http"
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"github.com/golang-jwt/jwt/v5"
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)
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type contextKey string
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const userIDKey contextKey = "userID"
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func (s *Server) hasAuth(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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cookie, err := r.Cookie("nfeeder_token")
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if err != nil {
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http.Redirect(w, r, "/login", http.StatusSeeOther)
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return
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}
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// parse and validate
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claims := &jwt.RegisteredClaims{}
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token, err := jwt.ParseWithClaims(cookie.Value, claims, func(t *jwt.Token) (interface{}, error) {
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// check alg
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if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
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}
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return jwtKey, nil
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})
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/// golang-jwt the library internally runs a Valid():
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/// Time Check: It compares time.Now() against the ExpiresAt value.
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/// Not Before Check: It checks if the nbf (Not Before) time has passed.
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/// Issued At Check: It ensures the iat isn't in the future.
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if err != nil || !token.Valid {
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http.Redirect(w, r, "/login", http.StatusSeeOther)
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return
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}
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// Verify issuer
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if claims.Issuer != ISSUER {
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http.Redirect(w, r, "/login", http.StatusSeeOther)
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return
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}
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// Success! Store userID in context for handlers to use
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ctx := context.WithValue(r.Context(), userIDKey, claims.Subject)
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next.ServeHTTP(w, r.WithContext(ctx))
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})
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}
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