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csrfhandler.go
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/
csrfhandler.go
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package mock
import (
"net/http"
log "github.com/sirupsen/logrus"
)
const (
firstToken = "firstToken"
secondToken = "secondToken"
HeaderCSRFToken = "X-csrf-token"
cookieName = "cookieToken"
)
type csrfHandler struct {
logger *log.Entry
isFirstToken bool
}
func NewCsrfHandler() *csrfHandler {
return &csrfHandler{
logger: log.WithField("Handler", "CSRF"),
isFirstToken: true,
}
}
func (ch *csrfHandler) CsrfToken(w http.ResponseWriter, r *http.Request) {
ch.logger.Infof("Handling CSRF request")
var token string
if ch.isFirstToken {
ch.logger.Infof("Providing first token: %s", firstToken)
token = firstToken
} else {
ch.logger.Infof("Providing second token: %s", secondToken)
token = secondToken
}
w.Header().Set(HeaderCSRFToken, token)
http.SetCookie(w, &http.Cookie{
Name: cookieName,
Value: token,
})
successResponse(w)
}
func (ch *csrfHandler) Target(w http.ResponseWriter, r *http.Request) {
var expectedToken string
if ch.isFirstToken {
expectedToken = firstToken
} else {
expectedToken = secondToken
}
ch.logger.Infof("Handling request. Expected: header: %s, with value: %s, cookie: %s, with value: %s", HeaderCSRFToken, expectedToken, cookieName, expectedToken)
headerToken := r.Header.Get(HeaderCSRFToken)
if headerToken != expectedToken {
ch.logger.Errorf("Invalid header: %s with CSRF token value: %s", HeaderCSRFToken, headerToken)
w.WriteHeader(http.StatusForbidden)
return
}
cookieToken, err := r.Cookie(cookieName)
if err != nil {
ch.logger.Errorf("No cookie: %s", cookieName)
w.WriteHeader(http.StatusForbidden)
return
}
if cookieToken.Value != expectedToken {
ch.logger.Errorf("Invalid cookie: %s with CSRF token value: %s", cookieName, cookieToken.Value)
w.WriteHeader(http.StatusForbidden)
return
}
ch.isFirstToken = false
successResponse(w)
}