火箭测试多部分/数据形式失败，422不可处理实体

问题描述

我想在这里测试我的上传路线。我有一个测试通过火箭测试客户端调用这条路线，但我总是得到 Status { code: 422,reason: "Unprocessable Entity" } 作为响应。

但是，我无法弄清楚我的请求正文有什么问题。

另外如果有其他方法可以测试multipart/data-form，那真的很受欢迎。

测试失败，但运行应用程序时我可以成功调用上传路由，我的 curl 命令是：curl -X POST -H "Accept: application/json" -F file=@/home/username/Downloads/example.jpg -F id="1588a509-3517-49f2-9dea-1791c2e99db9" -F allowed_file_types="image/jpeg" http://localhost:8000/upload

我还使用附加参数 --trace-ascii - 运行 curl 并对请求进行了处理，但我找不到导致测试期间 422 响应但在使用 curl 时有效的任何差异。

main.rs

#[macro_use] extern crate rocket;

use rocket::data::TempFile;
use rocket::form::Form;
use rocket_contrib::json::{json,JsonValue};
use rocket_contrib::uuid::Uuid;

#[derive(FromForm)]
pub struct FileUploadForm<'f> {
    id: Uuid,#[field(validate = len(1..))]
    allowed_file_types: Vec<String>,file: TempFile<'f>,}

#[post("/upload",data = "<form>")]
pub async fn upload(mut form: Form<FileUploadForm<'_>>) -> JsonValue {
    json!({"status": "ok"})
}

fn rocket() -> rocket::Rocket {
    let rocket = rocket::ignite();

    rocket
        .mount("/",routes![upload])
}

#[rocket::main]
async fn main() {
    rocket()
        .launch()
        .await;
}

#[cfg(test)]
mod tests {
    extern crate image;

    use super::*;

    use std::str;
    use rocket::local::blocking::Client;
    use rocket::http::{Status,Header};
    use std::{env,io};
    use std::fs::File;
    use std::io::{Write,Read};
    use std::path::PathBuf;
    use self::image::RgbImage;


    fn create_image(file_name: &str) -> PathBuf {
        let path_buf = env::temp_dir().join(file_name);

        let imgbuf: RgbImage= image::ImageBuffer::new(256,256);
        imgbuf.save(path_buf.as_path()).unwrap();

        path_buf
    }

    fn image_data(boundary: &str) -> io::Result<Vec<u8>> {
        // https://stackoverflow.com/questions/51397872/how-to-post-an-image-using-multipart-form-data-with-hyper
        // https://golangbyexample.com/multipart-form-data-content-type-golang/
        let mut data = Vec::new();

        // start
        write!(data,"--{}\r\n",boundary)?;

        // image data
        write!(data,"Content-disposition: form-data; name=\"file\"; filename=\"image.jpg\"\r\n")?;
        write!(data,"Content-Type: image/jpeg\r\n")?;
        write!(data,"\r\n")?;

        let path_buf = create_image("image.jpg");
        let mut f = File::open(path_buf.as_path())?;
        f.read_to_end(&mut data)?;
        write!(data,"\r\n")?;
        
        // id
        write!(data,boundary)?;
        write!(data,"Content-disposition: form-data; name=\"id\"\r\n")?;
        write!(data,"\r\n")?;

        write!(data,"1588a509-3517-49f2-9dea-1791c2e99db9")?;

        // allowed_file_types
        write!(data,"Content-disposition: form-data; name=\"allowed_file_types\"\r\n")?;
        write!(data,"image/jpeg")?;
        write!(data,boundary)?;

        // end
        write!(data,"--{}--\r\n",boundary)?;

        Ok(data)
    }

    #[test]
    fn upload_file() {
        const BOUNDARY: &str = "--------------------------------XYZ";

        let client = Client::tracked(rocket()).expect("valid rocket instance");
        let accept = Header::new("Accept","application/json");
        let content_type = Header::new("Content-Type",format!("multipart/form-data; boundary={}",BOUNDARY));

        let response = client
            .post("/upload")
            .header(content_type)
            .header(accept)
            .body(image_data(BOUNDARY).unwrap())
            .dispatch();

        assert_eq!(response.status(),Status::Ok);
    }
}

Cargo.toml

[package]
name = "example"
version = "0.1.0"
edition = "2018"

[dependencies]
rocket = { git = "https://github.com/SergioBenitez/Rocket",version = "0.5.0-dev" }
image = { version = "^0"}

[dependencies.rocket_contrib]
git = "https://github.com/SergioBenitez/Rocket"
version = "0.5.0-dev"
default-features = false
features = ["json","uuid"]

解决方法

我在 id 部分后面少了一个新行，正确的代码如下。我已经评论了导致错误的一行和我添加了一个不必要的边界的另一行。

actual

rust rust-rocket