有没有办法在 Warp 中作为过滤器的一部分进行验证？

Question

我定义了一个路由和一个端点函数。我还注入了一些依赖项。

pub fn route1() -> BoxedFilter<(String, ParamType)> {
    warp::get()
        .and(warp::path::param())
        .and(warp::filters::query::query())
        .and(warp::path::end())
        .boxed()
}

pub async fn handler1(
    query: String,
    param: ParamType,
    dependency: DependencyType,
) -> Result<impl warp::Reply, warp::Rejection> {
}

let api = api::routes::route1()
    .and(warp::any().map(move || dependency))
    .and_then(api::hanlders::hander1);

这一切似乎工作正常。

但是，我希望能够在多个端点前面放置一些东西，以检查查询参数中的有效键。在里面handler1我可以添加：

if !param.key_valid {
    return Ok(warp::reply::with_status(
        warp::reply::json(&""),
        StatusCode::BAD_REQUEST,
    ));
}

我不想将它单独添加到每个处理程序中。

似乎我应该能够通过 来做到这一点filter，但我无法弄清楚。我试过使用.map()但随后返回多个项目将其转换为一个元组，我必须更改我的下游函数签名。理想情况下，我想找到一种方法来添加验证或其他过滤器，这些过滤器可以在没有任何下游值了解它们的情况下拒绝请求。

Answer 1

warp 的拒绝示例有效地证明了这一点：

拒绝表示过滤器不应继续处理请求，但不同的过滤器可以处理它的情况。

从“div-by”标题中提取分母，或使用 DivideByZero 拒绝。

你需要

1. 使用Filter::and_then采取现有的过滤器（在这种情况下query()），并进行验证。如果验证失败，则返回自定义拒绝。
2. 使用Filter::recover适当地处理自定义拒绝和任何其他可能的错误。

适用于您的情况：

use serde::Deserialize;
use std::{convert::Infallible, net::IpAddr};
use warp::{filters::BoxedFilter, http::StatusCode, reject::Reject, Filter, Rejection, Reply};

fn route1() -> BoxedFilter<(String, ParamType)> {
    warp::get()
        .and(warp::path::param())
        .and(validated_query())
        .and(warp::path::end())
        .boxed()
}

#[derive(Debug)]
struct Invalid;
impl Reject for Invalid {}

fn validated_query() -> impl Filter<Extract = (ParamType,), Error = Rejection> + Copy {
    warp::filters::query::query().and_then(|param: ParamType| async move {
        if param.valid {
            Ok(param)
        } else {
            Err(warp::reject::custom(Invalid))
        }
    })
}

async fn report_invalid(r: Rejection) -> Result<impl Reply, Infallible> {
    let reply = warp::reply::reply();

    if let Some(Invalid) = r.find() {
        Ok(warp::reply::with_status(reply, StatusCode::BAD_REQUEST))
    } else {
        // Do better error handling here
        Ok(warp::reply::with_status(
            reply,
            StatusCode::INTERNAL_SERVER_ERROR,
        ))
    }
}

async fn handler1(
    _query: String,
    _param: ParamType,
    _dependency: DependencyType,
) -> Result<impl warp::Reply, warp::Rejection> {
    Ok(warp::reply::reply())
}

struct DependencyType;

#[derive(Deserialize)]
struct ParamType {
    valid: bool,
}

#[tokio::main]
async fn main() {
    let api = route1()
        .and(warp::any().map(move || DependencyType))
        .and_then(handler1)
        .recover(report_invalid);

    let ip: IpAddr = "127.0.0.1".parse().unwrap();
    let port = 8888;
    warp::serve(api).run((ip, port)).await;
}

并且删除了不相关行的 curl 输出：

use serde::Deserialize;
use std::{convert::Infallible, net::IpAddr};
use warp::{filters::BoxedFilter, http::StatusCode, reject::Reject, Filter, Rejection, Reply};

fn route1() -> BoxedFilter<(String, ParamType)> {
    warp::get()
        .and(warp::path::param())
        .and(validated_query())
        .and(warp::path::end())
        .boxed()
}

#[derive(Debug)]
struct Invalid;
impl Reject for Invalid {}

fn validated_query() -> impl Filter<Extract = (ParamType,), Error = Rejection> + Copy {
    warp::filters::query::query().and_then(|param: ParamType| async move {
        if param.valid {
            Ok(param)
        } else {
            Err(warp::reject::custom(Invalid))
        }
    })
}

async fn report_invalid(r: Rejection) -> Result<impl Reply, Infallible> {
    let reply = warp::reply::reply();

    if let Some(Invalid) = r.find() {
        Ok(warp::reply::with_status(reply, StatusCode::BAD_REQUEST))
    } else {
        // Do better error handling here
        Ok(warp::reply::with_status(
            reply,
            StatusCode::INTERNAL_SERVER_ERROR,
        ))
    }
}

async fn handler1(
    _query: String,
    _param: ParamType,
    _dependency: DependencyType,
) -> Result<impl warp::Reply, warp::Rejection> {
    Ok(warp::reply::reply())
}

struct DependencyType;

#[derive(Deserialize)]
struct ParamType {
    valid: bool,
}

#[tokio::main]
async fn main() {
    let api = route1()
        .and(warp::any().map(move || DependencyType))
        .and_then(handler1)
        .recover(report_invalid);

    let ip: IpAddr = "127.0.0.1".parse().unwrap();
    let port = 8888;
    warp::serve(api).run((ip, port)).await;
}

Cargo.toml

[dependencies]
warp = "0.2.2"
serde = { version = "1.0.104", features = ["derive"] }
tokio = { version = "0.2.13", features = ["full"] }