267 lines
8.9 KiB
JavaScript
267 lines
8.9 KiB
JavaScript
/* jslint node: true */
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'use strict';
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// ENiGMA½
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const ansi = require('./ansi_term.js');
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const Events = require('./events.js');
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const { Errors } = require('./enig_error.js');
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// deps
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const async = require('async');
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exports.connectEntry = connectEntry;
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function ansiDiscoverHomePosition(client, cb) {
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//
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// We want to find the home position. ANSI-BBS and most terminals
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// utilize 1,1 as home. However, some terminals such as ConnectBot
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// think of home as 0,0. If this is the case, we need to offset
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// our positioning to accommodate for such.
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//
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const done = function(err) {
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client.removeListener('cursor position report', cprListener);
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clearTimeout(giveUpTimer);
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return cb(err);
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};
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const cprListener = function(pos) {
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const h = pos[0];
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const w = pos[1];
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//
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// We expect either 0,0, or 1,1. Anything else will be filed as bad data
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//
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if(h > 1 || w > 1) {
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client.log.warn( { height : h, width : w }, 'Ignoring ANSI home position CPR due to unexpected values');
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return done(Errors.UnexpectedState('Home position CPR expected to be 0,0, or 1,1'));
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}
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if(0 === h & 0 === w) {
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//
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// Store a CPR offset in the client. All CPR's from this point on will offset by this amount
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//
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client.log.info('Setting CPR offset to 1');
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client.cprOffset = 1;
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}
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return done(null);
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};
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client.once('cursor position report', cprListener);
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const giveUpTimer = setTimeout( () => {
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return done(Errors.General('Giving up on home position CPR'));
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}, 3000); // 3s
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client.term.write(`${ansi.goHome()}${ansi.queryPos()}`); // go home, query pos
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}
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function ansiAttemptDetectUTF8(client, cb) {
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//
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// Trick to attempt and detect UTF-8. While there is a lot more than
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// just UTF-8 and CP437, many those are the main concerns, when it comes
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// terminals that for example tell us they are "xterm" but still want CP437.
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//
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// Try to detect UTF-8 by discovering the cursor position, writing some
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// multi-byte UTF-8, and checking the position again. If the term is really
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// UTF-8, we should get a proper position, otherwise we'll be further out.
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//
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// We currently only do this if the term hasn't already been ID'd as a
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// "*nix" terminal -- that is, xterm, etc.
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//
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if(!client.term.isNixTerm()) {
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return cb(null);
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}
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let posStage = 1;
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let initialPosition;
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let giveUpTimer;
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const giveUp = () => {
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client.removeListener('cursor position report', cprListener);
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clearTimeout(giveUpTimer);
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return cb(null);
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};
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const ASCIIPortion = ' Character encoding detection ';
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const cprListener = (pos) => {
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switch(posStage) {
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case 1 :
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posStage = 2;
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initialPosition = pos;
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clearTimeout(giveUpTimer);
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giveUpTimer = setTimeout( () => {
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return giveUp();
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}, 2000);
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client.once('cursor position report', cprListener);
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client.term.rawWrite(`\u9760${ASCIIPortion}\u9760`); // Unicode skulls on each side
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client.term.rawWrite(ansi.queryPos());
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break;
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case 2 :
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{
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clearTimeout(giveUpTimer);
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const len = pos[1] - initialPosition[1];
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if(!isNaN(len) && len >= ASCIIPortion.length + 6) { // CP437 displays 3 chars each Unicode skull
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client.log.info('Terminal identified as UTF-8 but does not appear to be. Overriding to "ansi".');
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client.setTermType('ansi');
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}
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}
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return cb(null);
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}
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};
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giveUpTimer = setTimeout( () => {
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return giveUp();
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}, 2000);
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client.once('cursor position report', cprListener);
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client.term.rawWrite(ansi.goHome() + ansi.queryPos());
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}
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function ansiQueryTermSizeIfNeeded(client, cb) {
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if(client.term.termHeight > 0 || client.term.termWidth > 0) {
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return cb(null);
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}
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const done = function(err) {
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client.removeListener('cursor position report', cprListener);
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clearTimeout(giveUpTimer);
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return cb(err);
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};
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const cprListener = function(pos) {
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//
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// If we've already found out, disregard
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//
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if(client.term.termHeight > 0 || client.term.termWidth > 0) {
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return done(null);
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}
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const h = pos[0];
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const w = pos[1];
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//
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// NetRunner for example gives us 1x1 here. Not really useful. Ignore
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// values that seem obviously bad. Included in the set is the explicit
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// 999x999 values we asked to move to.
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//
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if(h < 10 || h === 999 || w < 10 || w === 999) {
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client.log.warn(
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{ height : h, width : w },
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'Ignoring ANSI CPR screen size query response due to non-sane values');
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return done(Errors.Invalid('Term size <= 10 considered invalid'));
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}
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client.term.termHeight = h;
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client.term.termWidth = w;
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client.log.debug(
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{
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termWidth : client.term.termWidth,
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termHeight : client.term.termHeight,
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source : 'ANSI CPR'
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},
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'Window size updated'
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);
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return done(null);
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};
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client.once('cursor position report', cprListener);
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// give up after 2s
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const giveUpTimer = setTimeout( () => {
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return done(Errors.General('No term size established by CPR within timeout'));
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}, 2000);
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// Start the process:
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// 1 - Ask to goto 999,999 -- a very much "bottom right" (generally 80x25 for example
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// is the real size)
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// 2 - Query for screen size with bansi.txt style specialized Device Status Report (DSR)
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// request. We expect a CPR of:
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// a - Terms that support bansi.txt style: Screen size
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// b - Terms that do not support bansi.txt style: Since we moved to the bottom right
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// we should still be able to determine a screen size.
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//
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client.term.rawWrite(`${ansi.goto(999, 999)}${ansi.queryScreenSize()}`);
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}
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function prepareTerminal(term) {
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term.rawWrite(`${ansi.normal()}${ansi.clearScreen()}`);
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}
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function displayBanner(term) {
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// note: intentional formatting:
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term.pipeWrite(`
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|06Connected to |02EN|10i|02GMA|10½ |06BBS version |12|VN
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|06Copyright (c) 2014-2019 Bryan Ashby |14- |12http://l33t.codes/
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|06Updates & source |14- |12https://github.com/NuSkooler/enigma-bbs/
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|00`
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);
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}
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function connectEntry(client, nextMenu) {
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const term = client.term;
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async.series(
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[
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function basicPrepWork(callback) {
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term.rawWrite(ansi.queryDeviceAttributes(0));
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return callback(null);
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},
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function discoverHomePosition(callback) {
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ansiDiscoverHomePosition(client, () => {
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// :TODO: If CPR for home fully fails, we should bail out on the connection with an error, e.g. ANSI support required
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return callback(null); // we try to continue anyway
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});
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},
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function queryTermSizeByNonStandardAnsi(callback) {
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ansiQueryTermSizeIfNeeded(client, err => {
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if(err) {
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//
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// Check again; We may have got via NAWS/similar before CPR completed.
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//
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if(0 === term.termHeight || 0 === term.termWidth) {
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//
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// We still don't have something good for term height/width.
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// Default to DOS size 80x25.
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//
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// :TODO: Netrunner is currently hitting this and it feels wrong. Why is NAWS/ENV/CPR all failing???
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client.log.warn( { reason : err.message }, 'Failed to negotiate term size; Defaulting to 80x25!');
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term.termHeight = 25;
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term.termWidth = 80;
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}
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}
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return callback(null);
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});
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},
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function checkUtf8IfNeeded(callback) {
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return ansiAttemptDetectUTF8(client, callback);
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}
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],
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() => {
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prepareTerminal(term);
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//
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// Always show an ENiGMA½ banner
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//
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displayBanner(term);
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// fire event
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Events.emit(Events.getSystemEvents().TermDetected, { client : client } );
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setTimeout( () => {
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return client.menuStack.goto(nextMenu);
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}, 500);
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}
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);
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}
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