lhi 0.0.2

Lightweight HTTP library
Documentation 
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//! HTTP response

use std::collections::BTreeMap;
use std::convert::AsRef;

/// Additional response data
#[derive(Clone, Default, Debug)]
pub struct ResponseData<'a> {
    pub status: &'a str,
    pub headers: BTreeMap<&'a str, &'a str>,
}

impl<'a> ResponseData<'a> {
    /// Create new with default values
    pub fn new() -> Self {
        Self {
            status: "200 OK",
            headers: BTreeMap::new(),
        }
    }

    /// Change status
    pub fn set_status(mut self, status: &'a str) -> Self {
        self.status = status;
        self
    }
}

/// Create HTTP response
pub fn respond(
    content: impl AsRef<[u8]>,
    content_type: impl AsRef<str>,
    data: Option<ResponseData>,
) -> Vec<u8> {
    // convert content to &[u8]
    let content = content.as_ref();

    // additional response data
    let data = match data {
        Some(data) => data,
        None => ResponseData::new(),
    };
    let status = data.status;
    let mut headers = String::new();
    data.headers.iter().for_each(|(k, v)| {
        headers.push_str("\r\n");
        headers.push_str(k);
        headers.push_str(": ");
        headers.push_str(v);
    });

    // create response
    let mut response = Vec::new();
    let header = format!(
        "HTTP/1.1 {}\r\nserver: ltheinrich.de/lhi\r\ncontent-type: {}; charset=utf-8{}",
        status,
        content_type.as_ref(),
        headers
    );
    response.extend_from_slice(header.as_bytes());

    // write content
    response.append(&mut set_content_length(content.len()));
    response.extend_from_slice(content);
    response.extend_from_slice(b"\r\n");

    // return
    response
}

/// create content-length header bytes
fn set_content_length(content_length: usize) -> Vec<u8> {
    let mut header = Vec::new();
    header.extend_from_slice(b"\r\n");
    header.extend_from_slice(b"content-length: ");
    header.extend_from_slice((content_length + 2).to_string().as_bytes());
    header.extend_from_slice(b"\r\n\r\n");
    header
}

/// Create HTTP redirect response
pub fn redirect(url: impl AsRef<str>) -> Vec<u8> {
    // as ref
    let url = url.as_ref();

    // set location
    let mut headers = BTreeMap::new();
    headers.insert("location", url);

    // create response data
    let data = ResponseData {
        status: "303 See Other",
        headers,
    };

    // create and return response
    respond(
        format!("<html><head><title>Moved</title></head><body><h1>Moved</h1><p><a href=\"{0}\">{0}</a></p></body></html>", url),
        "text/html",
        Some(data)
        )
}