"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.positiveIntermediate = exports.positiveCompletion = exports.isMultiline = exports.isSingleLine = exports.parseControlResponse = void 0;
const LF = "\n";
/**
* Parse an FTP control response as a collection of messages. A message is a complete
* single- or multiline response. A response can also contain multiple multiline responses
* that will each be represented by a message. A response can also be incomplete
* and be completed on the next incoming data chunk for which case this function also
* describes a `rest`. This function converts all CRLF to LF.
*/
function parseControlResponse(text) {
const lines = text.split(/\r?\n/).filter(isNotBlank);
const messages = [];
let startAt = 0;
let tokenRegex;
for (let i = 0; i < lines.length; i++) {
const line = lines[i];
// No group has been opened.
if (!tokenRegex) {
if (isMultiline(line)) {
// Open a group by setting an expected token.
const token = line.substr(0, 3);
tokenRegex = new RegExp(`^${token}(?:$| )`);
startAt = i;
}
else if (isSingleLine(line)) {
// Single lines can be grouped immediately.
messages.push(line);
}
}
// Group has been opened, expect closing token.
else if (tokenRegex.test(line)) {
tokenRegex = undefined;
messages.push(lines.slice(startAt, i + 1).join(LF));
}
}
// The last group might not have been closed, report it as a rest.
const rest = tokenRegex ? lines.slice(startAt).join(LF) + LF : "";
return { messages, rest };
}
exports.parseControlResponse = parseControlResponse;
function isSingleLine(line) {
return /^\d\d\d(?:$| )/.test(line);
}
exports.isSingleLine = isSingleLine;
function isMultiline(line) {
return /^\d\d\d-/.test(line);
}
exports.isMultiline = isMultiline;
/**
* Return true if an FTP return code describes a positive completion.
*/
function positiveCompletion(code) {
return code >= 200 && code < 300;
}
exports.positiveCompletion = positiveCompletion;
/**
* Return true if an FTP return code describes a positive intermediate response.
*/
function positiveIntermediate(code) {
return code >= 300 && code < 400;
}
exports.positiveIntermediate = positiveIntermediate;
function isNotBlank(str) {
return str.trim() !== "";
}