providers/proxy: no exposed urls (#3151)

* test any callback

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* cleanup

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* dont detect callback in per-server handler

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* use full redirect uri with both path and query param

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* update tests

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* correctly route to embedded outpost for callback signature

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

* fix allowed redirects

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

internal/outpost/proxyv2/application/test.go

@@ -22,6 +22,11 @@ func newTestApplication() *Application {
 			BasicAuthEnabled:           api.PtrBool(true),
 			BasicAuthUserAttribute:     api.PtrString("username"),
 			BasicAuthPasswordAttribute: api.PtrString("password"),
+			OidcConfiguration: api.ProxyOutpostConfigOidcConfiguration{
+				AuthorizationEndpoint: "http://fake-auth.t.goauthentik.io/auth",
+				TokenEndpoint:         "http://fake-auth.t.goauthentik.io/token",
+				UserinfoEndpoint:      "http://fake-auth.t.goauthentik.io/userinfo",
+			},
 		},
 		http.DefaultClient,
 		nil,