distribution/internal/requestutil/util_test.go

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package requestutil
import (
"net/http"
"net/http/httptest"
"net/http/httputil"
"net/url"
"testing"
)
// SingleHostReverseProxy will insert an X-Forwarded-For header, and can be used to test
// RemoteAddr(). A fake RemoteAddr cannot be set on the HTTP request - it is overwritten
// at the transport layer to 127.0.0.1:<port> . However, as the X-Forwarded-For header
// just contains the IP address, it is different enough for testing.
func TestRemoteAddr(t *testing.T) {
var expectedRemote string
backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
if r.RemoteAddr == expectedRemote {
t.Errorf("Unexpected matching remote addresses")
}
actualRemote := RemoteAddr(r)
if expectedRemote != actualRemote {
t.Errorf("Mismatching remote hosts: %v != %v", expectedRemote, actualRemote)
}
w.WriteHeader(200)
}))
defer backend.Close()
backendURL, err := url.Parse(backend.URL)
if err != nil {
t.Fatal(err)
}
proxy := httputil.NewSingleHostReverseProxy(backendURL)
frontend := httptest.NewServer(proxy)
defer frontend.Close()
// X-Forwarded-For set by proxy
expectedRemote = "127.0.0.1"
proxyReq, err := http.NewRequest(http.MethodGet, frontend.URL, nil)
if err != nil {
t.Fatal(err)
}
resp, err := http.DefaultClient.Do(proxyReq)
if err != nil {
t.Fatal(err)
}
defer resp.Body.Close()
// RemoteAddr in X-Real-Ip
getReq, err := http.NewRequest(http.MethodGet, backend.URL, nil)
if err != nil {
t.Fatal(err)
}
expectedRemote = "1.2.3.4"
getReq.Header["X-Real-ip"] = []string{expectedRemote}
resp, err = http.DefaultClient.Do(getReq)
if err != nil {
t.Fatal(err)
}
defer resp.Body.Close()
// Valid X-Real-Ip and invalid X-Forwarded-For
getReq.Header["X-forwarded-for"] = []string{"1.2.3"}
resp, err = http.DefaultClient.Do(getReq)
if err != nil {
t.Fatal(err)
}
defer resp.Body.Close()
}