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middleware_v2.go
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middleware_v2.go
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package clerk
import (
"context"
"errors"
"net"
"net/http"
"net/url"
"regexp"
"strconv"
"strings"
"github.com/go-jose/go-jose/v3/jwt"
)
var urlSchemeRe = regexp.MustCompile(`(^\w+:|^)\/\/`)
// RequireSessionV2 will hijack the request and return an HTTP status 403
// if the session is not authenticated.
func RequireSessionV2(client Client, verifyTokenOptions ...VerifyTokenOption) func(handler http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
f := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
claims, ok := r.Context().Value(ActiveSessionClaims).(*SessionClaims)
if !ok || claims == nil {
w.WriteHeader(http.StatusForbidden)
return
}
next.ServeHTTP(w, r)
})
return WithSessionV2(client, verifyTokenOptions...)(f)
}
}
// SessionFromContext returns the session's (if any) claims, as parsed from the
// token.
func SessionFromContext(ctx context.Context) (*SessionClaims, bool) {
c, ok := ctx.Value(ActiveSessionClaims).(*SessionClaims)
return c, ok
}
// WithSessionV2 is the new middleware that supports Auth v2. If the session is
// authenticated, it adds the corresponding session claims found in the JWT to
// request's context.
func WithSessionV2(client Client, verifyTokenOptions ...VerifyTokenOption) func(handler http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// ****************************************************
// *
// HEADER AUTHENTICATION *
// *
// ****************************************************
_, authorizationHeaderExists := r.Header["Authorization"]
if authorizationHeaderExists {
headerToken := strings.TrimSpace(r.Header.Get("Authorization"))
headerToken = strings.TrimPrefix(headerToken, "Bearer ")
_, err := client.DecodeToken(headerToken)
if err != nil {
// signed out
next.ServeHTTP(w, r)
return
}
claims, err := client.VerifyToken(headerToken, verifyTokenOptions...)
if err == nil { // signed in
ctx := context.WithValue(r.Context(), ActiveSessionClaims, claims)
next.ServeHTTP(w, r.WithContext(ctx))
return
}
// Clerk.js should refresh the token and retry
w.WriteHeader(http.StatusUnauthorized)
return
}
// In development or staging environments only, based on the request User Agent, detect non-browser
// requests (e.g. scripts). If there is no Authorization header, consider the user as signed out
// and prevent interstitial rendering
if isDevelopmentOrStaging(client) && !strings.HasPrefix(r.UserAgent(), "Mozilla/") {
// signed out
next.ServeHTTP(w, r)
return
}
// in cross-origin requests the use of Authorization
// header is mandatory
if isCrossOrigin(r) {
// signed out
next.ServeHTTP(w, r)
return
}
// ****************************************************
// *
// COOKIE AUTHENTICATION *
// *
// ****************************************************
cookieToken, _ := r.Cookie("__session")
clientUat, _ := r.Cookie("__client_uat")
if isDevelopmentOrStaging(client) && (r.Referer() == "" || isCrossOrigin(r)) {
renderInterstitial(client, w)
return
}
if isProduction(client) && clientUat == nil {
next.ServeHTTP(w, r)
return
}
if clientUat != nil && clientUat.Value == "0" {
next.ServeHTTP(w, r)
return
}
if clientUat == nil {
renderInterstitial(client, w)
return
}
var clientUatTs int64
ts, err := strconv.ParseInt(clientUat.Value, 10, 64)
if err == nil {
clientUatTs = ts
}
if cookieToken == nil {
renderInterstitial(client, w)
return
}
claims, err := client.VerifyToken(cookieToken.Value, verifyTokenOptions...)
if err == nil {
if claims.IssuedAt != nil && clientUatTs <= int64(*claims.IssuedAt) {
ctx := context.WithValue(r.Context(), ActiveSessionClaims, claims)
next.ServeHTTP(w, r.WithContext(ctx))
return
}
renderInterstitial(client, w)
return
}
if errors.Is(err, jwt.ErrExpired) || errors.Is(err, jwt.ErrIssuedInTheFuture) {
renderInterstitial(client, w)
return
}
// signed out
next.ServeHTTP(w, r)
return
})
}
}
func isCrossOrigin(r *http.Request) bool {
// origin contains scheme+host and optionally port (ommitted if 80 or 443)
// ref. https://www.rfc-editor.org/rfc/rfc6454#section-6.1
origin := strings.TrimSpace(r.Header.Get("Origin"))
origin = urlSchemeRe.ReplaceAllString(origin, "") // strip scheme
if origin == "" {
return false
}
// parse request's host and port, taking into account reverse proxies
u := &url.URL{Host: r.Host}
host := strings.TrimSpace(r.Header.Get("X-Forwarded-Host"))
if host == "" {
host = u.Hostname()
}
port := strings.TrimSpace(r.Header.Get("X-Forwarded-Port"))
if port == "" {
port = u.Port()
}
if port != "" && port != "80" && port != "443" {
host = net.JoinHostPort(host, port)
}
return origin != host
}
func isDevelopmentOrStaging(c Client) bool {
return strings.HasPrefix(c.APIKey(), "test_") || strings.HasPrefix(c.APIKey(), "sk_test_")
}
func isProduction(c Client) bool {
return !isDevelopmentOrStaging(c)
}
func renderInterstitial(c Client, w http.ResponseWriter) {
w.Header().Set("content-type", "text/html")
w.WriteHeader(401)
resp, _ := c.Interstitial()
w.Write(resp)
}