tablo-core 0.3.0

//! Reads values back out of rendered responses: bodies, cookies, form data,
//! and the semantic HTML queries over tables, fields, and filters.
//!
//! Re-exported for compatibility by `tablo-test`, whose client drives the
//! requests these helpers read.

pub mod dom;

pub use dom::{FilterOption, Row, RowActions, field_error, filter_options, row_actions, rows};
use http_body_util::BodyExt;
use topcoat::router::Body;

/// One `Cookie` header value from `(name, value)` pairs, or `None` when empty.
pub fn cookie_header<'a>(cookies: impl IntoIterator<Item = (&'a str, &'a str)>) -> Option<String> {
    let mut jar = String::new();
    for (name, value) in cookies {
        if !jar.is_empty() {
            jar.push_str("; ");
        }
        jar.push_str(name);
        jar.push('=');
        jar.push_str(value);
    }
    (!jar.is_empty()).then_some(jar)
}

/// Collect a response body as bytes.
pub async fn body_bytes(response: http::Response<Body>) -> Vec<u8> {
    response
        .into_body()
        .collect()
        .await
        .expect("collect body")
        .to_bytes()
        .to_vec()
}

/// Collect a response body as a lossy UTF-8 string.
pub async fn body_string(response: http::Response<Body>) -> String {
    String::from_utf8_lossy(&body_bytes(response).await).into_owned()
}

/// URL-encode `(key, value)` pairs into an urlencoded form body.
pub fn form_body(pairs: &[(&str, &str)]) -> String {
    let mut serializer = form_urlencoded::Serializer::new(String::new());
    for (key, value) in pairs {
        serializer.append_pair(key, value);
    }
    serializer.finish()
}

/// Builds a multipart body, one part per entry: `None` is a text part,
/// `Some("")` the browser's "no file chosen" part, `Some(name)` a chosen file.
pub fn multipart_body(boundary: &str, parts: &[(&str, Option<&str>, &str)]) -> String {
    let mut body = String::new();
    for (name, filename, content) in parts {
        body.push_str(&format!(
            "--{boundary}\r\nContent-Disposition: form-data; name=\"{name}\""
        ));
        if let Some(filename) = filename {
            body.push_str(&format!("; filename=\"{filename}\""));
        }
        body.push_str("\r\n\r\n");
        body.push_str(content);
        body.push_str("\r\n");
    }
    body.push_str(&format!("--{boundary}--\r\n"));
    body
}

/// Reads the `value` of the named `<input>` in rendered HTML, in either
/// attribute order or quote style.
pub fn input_value(html: &str, name: &str) -> Option<String> {
    let double = format!("name=\"{name}\"");
    let single = format!("name='{name}'");
    for tag in html.split('<').skip(1) {
        if !tag.contains(&double) && !tag.contains(&single) {
            continue;
        }
        let attrs = &tag[..tag.find('>')?];
        for (prefix, term) in [("value=\"", '"'), ("value='", '\'')] {
            if let Some(start) = attrs.find(prefix) {
                let rest = &attrs[start + prefix.len()..];
                if let Some(end) = rest.find(term) {
                    // Unescape the matching quote entity the encoder may emit.
                    let raw = &rest[..end];
                    return Some(raw.replace("&quot;", "\"").replace("&#x27;", "'"));
                }
            }
        }
    }
    None
}

/// Names the session cookie Topcoat's default token store writes.
pub const SESSION_COOKIE: &str = "__Host-session";

/// The `(name, value)` pairs a response's `Set-Cookie` headers carry.
pub fn response_cookies(response: &http::Response<Body>) -> Vec<(String, String)> {
    response
        .headers()
        .get_all(http::header::SET_COOKIE)
        .iter()
        .filter_map(|value| value.to_str().ok())
        .filter_map(|value| value.split(';').next())
        .filter_map(|pair| pair.split_once('='))
        .map(|(name, value)| (name.trim().to_string(), value.trim().to_string()))
        .collect()
}

/// The full `Set-Cookie` header for `name`, so tests can assert attributes.
pub fn set_cookie_header(response: &http::Response<Body>, name: &str) -> Option<String> {
    response
        .headers()
        .get_all(http::header::SET_COOKIE)
        .iter()
        .filter_map(|value| value.to_str().ok())
        .find(|value| value.starts_with(&format!("{name}=")))
        .map(str::to_string)
}

/// The session cookie value a response set, if any.
pub fn session_cookie_value(response: &http::Response<Body>) -> Option<String> {
    response_cookies(response)
        .into_iter()
        .find(|(name, _)| name == SESSION_COOKIE)
        .map(|(_, value)| value)
}