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feat(expressions): add contentLength to bot expressions #1120

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Merged
merged 1 commit into from
Sep 15, 2025
Merged

feat(expressions): add contentLength to bot expressions #1120

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1 change: 1 addition & 0 deletions docs/docs/CHANGELOG.md
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Expand Up @@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

<!-- This changes the project to: -->

- Add `contentLength` variable to bot expressions.
- Add `COOKIE_SAME_SITE_MODE` to force anubis cookies SameSite value, and downgrade automatically from `None` to `Lax` if cookie is insecure.
- Fix lock convoy problem in decaymap ([#1103](https://github.com/TecharoHQ/anubis/issues/1103)).
- Fix lock convoy problem in bbolt by implementing the actor pattern ([#1103](https://github.com/TecharoHQ/anubis/issues/1103)).
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1 change: 1 addition & 0 deletions docs/docs/admin/configuration/expressions.mdx
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Expand Up @@ -103,6 +103,7 @@ Anubis exposes the following variables to expressions:
| :-------------- | :-------------------- | :-------------------------------------------------------------------------------------------------------------------------------------------- | :----------------------------------------------------------- |
| `headers` | `map[string, string]` | The [headers](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers) of the request being processed. | `{"User-Agent": "Mozilla/5.0 Gecko/20100101 Firefox/137.0"}` |
| `host` | `string` | The [HTTP hostname](https://web.dev/articles/url-parts#host) the request is targeted to. | `anubis.techaro.lol` |
| `contentLength` | `int64` | The numerical value of the `Content-Length` header. |
| `load_1m` | `double` | The current system load average over the last one minute. This is useful for making [load-based checks](#using-the-system-load-average). |
| `load_5m` | `double` | The current system load average over the last five minutes. This is useful for making [load-based checks](#using-the-system-load-average). |
| `load_15m` | `double` | The current system load average over the last fifteen minutes. This is useful for making [load-based checks](#using-the-system-load-average). |
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2 changes: 2 additions & 0 deletions lib/policy/celchecker.go
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Expand Up @@ -61,6 +61,8 @@ func (cr *CELRequest) ResolveName(name string) (any, bool) {
switch name {
case "remoteAddress":
return cr.Header.Get("X-Real-Ip"), true
case "contentLength":
return cr.ContentLength, true
case "host":
return cr.Host, true
case "method":
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1 change: 1 addition & 0 deletions lib/policy/expressions/environment.go
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Expand Up @@ -19,6 +19,7 @@ func BotEnvironment() (*cel.Env, error) {
return New(
// Variables exposed to CEL programs:
cel.Variable("remoteAddress", cel.StringType),
cel.Variable("contentLength", cel.IntType),
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@Xe Xe Sep 15, 2025

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I checked, IntType is int64.

cel.Variable("host", cel.StringType),
cel.Variable("method", cel.StringType),
cel.Variable("userAgent", cel.StringType),
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