Update dependencies

vendor/github.com/gorilla/csrf/store.go

@@ -0,0 +1,87 @@
+//go:build go1.11
+// +build go1.11
+
+package csrf
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/gorilla/securecookie"
+)
+
+// store represents the session storage used for CSRF tokens.
+type store interface {
+	// Get returns the real CSRF token from the store.
+	Get(*http.Request) ([]byte, error)
+	// Save stores the real CSRF token in the store and writes a
+	// cookie to the http.ResponseWriter.
+	// For non-cookie stores, the cookie should contain a unique (256 bit) ID
+	// or key that references the token in the backend store.
+	// csrf.GenerateRandomBytes is a helper function for generating secure IDs.
+	Save(token []byte, w http.ResponseWriter) error
+}
+
+// cookieStore is a signed cookie session store for CSRF tokens.
+type cookieStore struct {
+	name     string
+	maxAge   int
+	secure   bool
+	httpOnly bool
+	path     string
+	domain   string
+	sc       *securecookie.SecureCookie
+	sameSite SameSiteMode
+}
+
+// Get retrieves a CSRF token from the session cookie. It returns an empty token
+// if decoding fails (e.g. HMAC validation fails or the named cookie doesn't exist).
+func (cs *cookieStore) Get(r *http.Request) ([]byte, error) {
+	// Retrieve the cookie from the request
+	cookie, err := r.Cookie(cs.name)
+	if err != nil {
+		return nil, err
+	}
+
+	token := make([]byte, tokenLength)
+	// Decode the HMAC authenticated cookie.
+	err = cs.sc.Decode(cs.name, cookie.Value, &token)
+	if err != nil {
+		return nil, err
+	}
+
+	return token, nil
+}
+
+// Save stores the CSRF token in the session cookie.
+func (cs *cookieStore) Save(token []byte, w http.ResponseWriter) error {
+	// Generate an encoded cookie value with the CSRF token.
+	encoded, err := cs.sc.Encode(cs.name, token)
+	if err != nil {
+		return err
+	}
+
+	cookie := &http.Cookie{
+		Name:     cs.name,
+		Value:    encoded,
+		MaxAge:   cs.maxAge,
+		HttpOnly: cs.httpOnly,
+		Secure:   cs.secure,
+		SameSite: http.SameSite(cs.sameSite),
+		Path:     cs.path,
+		Domain:   cs.domain,
+	}
+
+	// Set the Expires field on the cookie based on the MaxAge
+	// If MaxAge <= 0, we don't set the Expires attribute, making the cookie
+	// session-only.
+	if cs.maxAge > 0 {
+		cookie.Expires = time.Now().Add(
+			time.Duration(cs.maxAge) * time.Second)
+	}
+
+	// Write the authenticated cookie to the response.
+	http.SetCookie(w, cookie)
+
+	return nil
+}