# Filtering

GDIntercept allows you to filter requests and responses with a set of options to make your event listeners more specific. This is done by using the `RequestFilter` and `ResponseFilter` classes in the event listener constructors.

## Origin Filter

GDIntercept has a few origins it recognizes, these are:

- `OriginFilter::GD_FILTER`: Every request sent to:
  - <https://boomlings.com>
  - <https://geometrydash.com>
- `OriginFilter::GD_CDN_FILTER`: Every request sent to:
  - <https://geometrydashfiles.b-cdn.net>
  - <https://geometrydashcontent.b-cdn.net>
- `OriginFilter::ROBTOP_GAMES_FILTER`: Every request sent to:
  - <https://robtopgames.org>
  - <https://robtopgames.net>
  - <https://robtopgames.com>
  - <https://robtop.games>
- `OriginFilter::NEWGROUNDS_FILTER`: Every request sent to:
  - <https://ngfiles.com>
- `OriginFilter::GEODE_FILTER`: Every request sent to:
  - <https://geode-sdk.org>
- `OriginFilter:LOCALHOST_FILTER`: Every request sent to:
  - <http://localhost>
- `OriginFilter::OTHER_FILTER`: Every request that doesn't match any of the above
- `OriginFilter::ALL_FILTER`: Every request

```cpp
RequestFilter(OriginFilter::GD_FILTER)
ResponseFilter(OriginFilter::GD_CDN_FILTER)
```

## URL Filter

You can also filter requests based on a part of the URL (excluding the query string). This is done by giving a string vector to the filter constructor:

```cpp
// Possible URLs:
// https://www.boomlings.com/database/getGJLevels21.php
// https://geometrydash.com/index.php
RequestFilter({"boomlings.com/database", "geometrydash.com"})
// Possible URLs:
// https://boomlings.com/database/accounts/loginGJAccount.php
ResponseFilter({"https://boomlings.com/database"})
```

## Node Listener Filter

Node listeners require the filter to be provided in the template arg. As a result, the last parameters of the `this->template addEventListener` functions are the filters constructor parameters:

```cpp
// The filter parameter is optional, otherwise it can be filled in with any of the standard parameters
this->template addEventListener<RequestFilter>([=](const RequestEvent* event) {
    // ...
}, OriginFilter::ALL_FILTER);
```