tildefriends/core/http.js
2024-02-24 11:09:34 -05:00

114 lines
2.8 KiB
JavaScript

/**
* TODOC
* TODO: document so we can improve this
* @param {*} url
* @returns
*/
function parseUrl(url) {
// XXX: Hack.
let match = url.match(new RegExp('(\\w+)://([^/:]+)(?::(\\d+))?(.*)'));
return {
protocol: match[1],
host: match[2],
path: match[4],
port: match[3] ? parseInt(match[3]) : match[1] == 'http' ? 80 : 443,
};
}
/**
* TODOC
* @param {*} data
* @returns
*/
function parseResponse(data) {
let firstLine;
let headers = {};
while (true) {
let endLine = data.indexOf('\r\n');
let line = data.substring(0, endLine);
data = data.substring(endLine + 2);
if (!line.length) {
break;
} else if (!firstLine) {
firstLine = line;
} else {
let colon = line.indexOf(':');
headers[line.substring(colon)] = line.substring(colon + 1);
}
}
return {body: data};
}
/**
* TODOC
* @param {*} url
* @param {*} options
* @param {*} allowed_hosts
* @returns
*/
export function fetch(url, options, allowed_hosts) {
let parsed = parseUrl(url);
return new Promise(function (resolve, reject) {
if ((allowed_hosts ?? []).indexOf(parsed.host) == -1) {
throw new Error(`fetch() request to host ${parsed.host} is not allowed.`);
}
let socket = new Socket();
let buffer = new Uint8Array(0);
return socket
.connect(parsed.host, parsed.port)
.then(function () {
socket.read(function (data) {
if (data && data.length) {
let newBuffer = new Uint8Array(buffer.length + data.length);
newBuffer.set(buffer, 0);
newBuffer.set(data, buffer.length);
buffer = newBuffer;
} else {
let result = parseHttpResponse(buffer);
if (!result) {
reject(new Exception('Parse failed.'));
}
if (typeof result == 'number') {
if (result == -2) {
reject('Incomplete request.');
} else {
reject('Bad request.');
}
} else if (typeof result == 'object') {
resolve({
body: buffer.slice(result.bytes_parsed),
status: result.status,
message: result.message,
headers: result.headers,
});
} else {
reject(new Exception('Unexpected parse result.'));
}
resolve(parseResponse(utf8Decode(buffer)));
}
});
if (parsed.port == 443) {
return socket.startTls();
}
})
.then(function () {
let body =
typeof options?.body == 'string'
? utf8Encode(options.body)
: options.body || new Uint8Array(0);
let headers = utf8Encode(
`${options?.method ?? 'GET'} ${parsed.path} HTTP/1.0\r\nHost: ${parsed.host}\r\nConnection: close\r\nContent-Length: ${body.length}\r\n\r\n`
);
let fullRequest = new Uint8Array(headers.length + body.length);
fullRequest.set(headers, 0);
fullRequest.set(body, headers.length);
socket.write(fullRequest);
})
.catch(function (error) {
reject(error);
});
});
}