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csrf_validation_handler.go
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/
csrf_validation_handler.go
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package auth
import (
"net/http"
"code.cloudfoundry.org/lager"
"github.com/pf-qiu/concourse/v6/skymarshal/token"
)
func CSRFValidationHandler(
handler http.Handler,
middleware token.Middleware,
) http.Handler {
return csrfValidationHandler{
handler: handler,
middleware: middleware,
}
}
type csrfValidationHandler struct {
handler http.Handler
middleware token.Middleware
}
func (h csrfValidationHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
logger, ok := r.Context().Value("logger").(lager.Logger)
if !ok {
panic("logger is not set in request context for csrf validation handler")
}
logger = logger.Session("csrf-validation")
if IsCSRFRequired(r) {
csrfHeader := r.Header.Get(CSRFHeaderName)
if csrfHeader == "" {
logger.Debug("csrf-header-is-not-set")
w.WriteHeader(http.StatusUnauthorized)
return
}
csrfToken := h.middleware.GetCSRFToken(r)
if csrfToken == "" {
logger.Debug("csrf-is-not-provided-in-auth-token")
w.WriteHeader(http.StatusUnauthorized)
return
}
if csrfToken != csrfHeader {
logger.Debug("csrf-token-does-not-match-auth-token", lager.Data{
"auth-csrf-token": csrfToken,
"request-csrf-token": csrfHeader,
})
w.WriteHeader(http.StatusUnauthorized)
return
}
}
h.handler.ServeHTTP(w, r)
}