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CDCloudflare Developers

•Created by alex35mil on 11/30/2023 in #🦀rust-on-workers

How to send `FormData` via `Fetch`? I

@natsumesou you can call .into() on a string to turn it into JsValue since the latter implements From<String>

6 replies

CDCloudflare Developers

•Created by alex35mil on 11/30/2023 in #🦀rust-on-workers

How to send `FormData` via `Fetch`? I

Apparently, there's no way to use exposed FormData for a request body, so I just build a string manually (I don't send any files yet, so it supports only text fields):

pub trait Body: fmt::Debug {
    fn content_type(&self) -> String;
    fn try_into(&self) -> Result<JsValue, worker::Error>;
}

#[derive(Debug)]
pub struct FormDataBody(HashMap<String, String>);

impl FormDataBody {
    const BOUNDARY: &'static str = "X-INSERT-YOUR-BOUNDARY";

    pub fn new() -> Self {
        Self(HashMap::new())
    }

    pub fn append(&mut self, key: &str, value: &str) {
        self.0.insert(key.to_string(), value.to_string());
    }
}

impl Body for FormDataBody {
    fn content_type(&self) -> String {
        format!("multipart/form-data; boundary={}", Self::BOUNDARY)
    }

    fn try_into(&self) -> Result<JsValue, worker::Error> {
        let mut body = String::new();

        for (key, value) in &self.0 {
            body.push_str(&format!("--{}\r\n", Self::BOUNDARY));
            body.push_str(&format!("Content-Disposition: form-data; name=\"{key}\""));
            body.push_str(&format!("\r\n\r\n{value}\r\n"));
        }

        body.push_str(&format!("--{}--\r\n", Self::BOUNDARY));

        Ok(body.into())
    }
}

pub trait Body: fmt::Debug {
    fn content_type(&self) -> String;
    fn try_into(&self) -> Result<JsValue, worker::Error>;
}

#[derive(Debug)]
pub struct FormDataBody(HashMap<String, String>);

impl FormDataBody {
    const BOUNDARY: &'static str = "X-INSERT-YOUR-BOUNDARY";

    pub fn new() -> Self {
        Self(HashMap::new())
    }

    pub fn append(&mut self, key: &str, value: &str) {
        self.0.insert(key.to_string(), value.to_string());
    }
}

impl Body for FormDataBody {
    fn content_type(&self) -> String {
        format!("multipart/form-data; boundary={}", Self::BOUNDARY)
    }

    fn try_into(&self) -> Result<JsValue, worker::Error> {
        let mut body = String::new();

        for (key, value) in &self.0 {
            body.push_str(&format!("--{}\r\n", Self::BOUNDARY));
            body.push_str(&format!("Content-Disposition: form-data; name=\"{key}\""));
            body.push_str(&format!("\r\n\r\n{value}\r\n"));
        }

        body.push_str(&format!("--{}--\r\n", Self::BOUNDARY));

        Ok(body.into())
    }
}

6 replies

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