enigma-bbs/core/servers/content/gopher.js

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/* jslint node: true */
'use strict';
// ENiGMA½
const Log = require('../../logger.js').log;
const { ServerModule } = require('../../server_module.js');
const Config = require('../../config.js').get;
const { Errors } = require('../../enig_error.js');
const {
splitTextAtTerms,
isAnsi,
stripAnsiControlCodes,
wildcardMatch,
} = require('../../string_util.js');
const {
getMessageConferenceByTag,
getMessageAreaByTag,
getMessageListForArea,
getAvailableMessageAreasByConfTag,
} = require('../../message_area.js');
const { sortAreasOrConfs } = require('../../conf_area_util.js');
const AnsiPrep = require('../../ansi_prep.js');
const { wordWrapText } = require('../../word_wrap.js');
const { stripMciColorCodes } = require('../../color_codes.js');
// deps
const net = require('net');
const _ = require('lodash');
const fs = require('graceful-fs');
const paths = require('path');
const moment = require('moment');
const ModuleInfo = (exports.moduleInfo = {
name: 'Gopher',
desc: 'A RFC-1436-ish Gopher Server',
author: 'NuSkooler',
packageName: 'codes.l33t.enigma.gopher.server',
notes: 'https://tools.ietf.org/html/rfc1436',
});
const Message = require('../../message.js');
const ItemTypes = {
Invalid: '', // not really a type, of course!
// Canonical, RFC-1436
TextFile: '0',
SubMenu: '1',
CCSONameserver: '2',
Error: '3',
BinHexFile: '4',
DOSFile: '5',
UuEncodedFile: '6',
FullTextSearch: '7',
Telnet: '8',
BinaryFile: '9',
AltServer: '+',
GIFFile: 'g',
ImageFile: 'I',
Telnet3270: 'T',
// Non-canonical
HtmlFile: 'h',
InfoMessage: 'i',
SoundFile: 's',
};
exports.getModule = class GopherModule extends ServerModule {
constructor() {
super();
this.routes = new Map(); // selector->generator => gopher item
this.log = Log.child({ server: 'Gopher' });
}
createServer(cb) {
if (!this.enabled) {
return cb(null);
}
const config = Config();
this.publicHostname = config.contentServers.gopher.publicHostname;
this.publicPort = config.contentServers.gopher.publicPort;
this.addRoute(
/^\/?msgarea(\/[a-z0-9_-]+(\/[a-z0-9_-]+)?(\/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}(_raw)?)?)?\/?\r\n$/,
this.messageAreaGenerator
);
this.addRoute(/^(\/?[^\t\r\n]*)\r\n$/, this.staticGenerator);
this.server = net.createServer(socket => {
socket.setEncoding('ascii');
socket.on('data', data => {
// sanitize a bit - bots like to inject garbage
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data = data.replace(/[^ -~\t\r\n]/g, '');
if (data) {
this.routeRequest(data, socket);
} else {
this.notFoundGenerator('**invalid selector**', res => {
return socket.end(`${res}`);
});
}
});
socket.on('error', err => {
if ('ECONNRESET' !== err.code) {
// normal
this.log.trace({ error: err.message }, 'Socket error');
}
});
});
return cb(null);
}
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listen(cb) {
if (!this.enabled) {
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return cb(null);
}
const config = Config();
const port = parseInt(config.contentServers.gopher.port);
if (isNaN(port)) {
this.log.warn(
{ port: config.contentServers.gopher.port, server: ModuleInfo.name },
'Invalid Gopher port'
);
return cb(
Errors.Invalid(`Invalid port: ${config.contentServers.gopher.port}`)
);
}
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return this.server.listen(port, config.contentServers.gopher.address, cb);
}
get enabled() {
return (
_.get(Config(), 'contentServers.gopher.enabled', false) && this.isConfigured()
);
}
isConfigured() {
// public hostname & port must be set; responses contain them!
const config = Config();
return (
_.isString(_.get(config, 'contentServers.gopher.publicHostname')) &&
_.isNumber(_.get(config, 'contentServers.gopher.publicPort'))
);
}
addRoute(selectorRegExp, generatorHandler) {
if (_.isString(selectorRegExp)) {
try {
selectorRegExp = new RegExp(`${selectorRegExp}\r\n`);
} catch (e) {
this.log.warn({ pattern: selectorRegExp }, 'Invalid RegExp for selector');
return false;
}
}
this.routes.set(selectorRegExp, generatorHandler.bind(this));
}
routeRequest(selector, socket) {
let match;
for (let [regex, gen] of this.routes) {
match = selector.match(regex);
if (match) {
return gen(match, res => {
return socket.end(`${res}`);
});
}
}
this.notFoundGenerator(selector, res => {
return socket.end(`${res}`);
});
}
makeItem(itemType, text, selector, hostname, port) {
selector = selector || ''; // e.g. for info
hostname = hostname || this.publicHostname;
port = port || this.publicPort;
return `${itemType}${text}\t${selector}\t${hostname}\t${port}\r\n`;
}
staticGenerator(selectorMatch, cb) {
this.log.debug(
{ selector: selectorMatch[1] || '(gophermap)' },
'Serving static content'
);
const requestedPath = selectorMatch[1];
let path = this.resolveContentPath(requestedPath);
if (!path) {
return cb('Not found');
}
fs.stat(path, (err, stats) => {
if (err) {
return cb('Not found');
}
let isGopherMap = false;
if (stats.isDirectory()) {
path = paths.join(path, 'gophermap');
isGopherMap = true;
}
fs.readFile(path, isGopherMap ? 'utf8' : null, (err, content) => {
if (err) {
let content = 'You have reached an ENiGMA½ Gopher server!\r\n';
content += this.makeItem(
ItemTypes.SubMenu,
'Public Message Area',
'/msgarea'
);
return cb(content);
}
if (isGopherMap) {
// Convert any UNIX style LF's to DOS CRLF's
content = content.replace(/\r?\n/g, '\r\n');
// variable support
content = content
.replace(/{publicHostname}/g, this.publicHostname)
.replace(/{publicPort}/g, this.publicPort);
}
return cb(content);
});
});
}
resolveContentPath(requestPath) {
const staticRoot = _.get(Config(), 'contentServers.gopher.staticRoot');
const path = paths.resolve(staticRoot, `.${requestPath}`);
if (path.startsWith(staticRoot)) {
return path;
}
}
notFoundGenerator(selector, cb) {
this.log.debug({ selector }, 'Serving not found content');
return cb('Not found');
}
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_getConfigForConferenceTag(confTag) {
const sysConfig = Config();
let config = _.get(sysConfig, [
'contentServers',
'gopher',
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'exposedConfAreas',
confTag,
]);
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if (config) {
return [config, false]; // new
}
return [
_.get(sysConfig, ['contentServers', 'gopher', 'messageConferences', confTag]),
true,
];
}
isAreaAndConfExposed(confTag, areaTag) {
const [confConfig, isLegacy] = this._getConfigForConferenceTag(confTag);
if (isLegacy) {
return Array.isArray(confConfig) && confConfig.includes(areaTag);
}
if (!Array.isArray(confConfig.include)) {
return false;
}
let exposed = false;
for (let rule of confConfig.include) {
if (wildcardMatch(areaTag, rule)) {
exposed = true;
break;
}
}
// may still be excluded
for (let rule of confConfig.exclude || []) {
if (wildcardMatch(areaTag, rule)) {
exposed = false;
break;
}
}
return exposed;
}
prepareMessageBody(body, cb) {
//
// From RFC-1436:
// "User display strings are intended to be displayed on a line on a
// typical screen for a user's viewing pleasure. While many screens can
// accommodate 80 character lines, some space is needed to display a tag
// of some sort to tell the user what sort of item this is. Because of
// this, the user display string should be kept under 70 characters in
// length. Clients may truncate to a length convenient to them."
//
// Messages on BBSes however, have generally been <= 79 characters. If we
// start wrapping earlier, things will generally be OK except:
// * When we're doing with FTN-style quoted lines
// * When dealing with ANSI/ASCII art
//
// Anyway, the spec says "should" and not MUST or even SHOULD! ...so, to
// to follow the KISS principle: Wrap at 79.
//
const WordWrapColumn = 79;
if (isAnsi(body)) {
AnsiPrep(
body,
{
cols: WordWrapColumn, // See notes above
forceLineTerm: true, // Ensure each line is term'd
asciiMode: true, // Export to ASCII
fillLines: false, // Don't fill up to |cols|
},
(err, prepped) => {
return cb(prepped || body);
}
);
} else {
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const cleaned = stripMciColorCodes(
stripAnsiControlCodes(body, { all: true })
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);
const prepped = splitTextAtTerms(cleaned)
.map(l =>
(wordWrapText(l, { width: WordWrapColumn }).wrapped || []).join('\n')
)
.join('\n');
return cb(prepped);
}
}
shortenSubject(subject) {
return _.truncate(subject, { length: 30 });
}
messageAreaGenerator(selectorMatch, cb) {
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this.log.trace({ selector: selectorMatch[0] }, 'Message area request');
//
// Selector should be:
// /msgarea - list confs
// /msgarea/conftag - list areas in conf
// /msgarea/conftag/areatag - list messages in area
// /msgarea/conftag/areatag/<UUID> - message as text
// /msgarea/conftag/areatag/<UUID>_raw - full message as text + headers
//
if (selectorMatch[3] || selectorMatch[4]) {
// message selector - display message
// message
//const raw = selectorMatch[4] ? true : false;
// :TODO: support 'raw'
const msgUuid = selectorMatch[3].replace(/\r\n|\//g, '');
const confTag = selectorMatch[1].substr(1).split('/')[0];
const areaTag = selectorMatch[2].replace(/\r\n|\//g, '');
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return this._displayMessage(selectorMatch, msgUuid, confTag, areaTag, cb);
} else if (selectorMatch[2]) {
// conf/area selector -- list messages in area
const confTag = selectorMatch[1].substr(1).split('/')[0];
const areaTag = selectorMatch[2].replace(/\r\n|\//g, '');
const area = getMessageAreaByTag(areaTag);
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return this._listMessagesInArea(selectorMatch, confTag, areaTag, area, cb);
} else if (selectorMatch[1]) {
// message conference selector -- list areas in this conference
const confTag = selectorMatch[1].replace(/\r\n|\//g, '');
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return this._listExposedMessageConferenceAreas(selectorMatch, confTag, cb);
} else {
// message area base selector -- list exposed message conferences
return this._listExposedMessageConferences(cb);
}
}
_makeAvailableMessageConferencesResponse(messageConferences, cb) {
sortAreasOrConfs(messageConferences);
const response = [
this.makeItem(ItemTypes.InfoMessage, '-'.repeat(70)),
this.makeItem(ItemTypes.InfoMessage, 'Available Message Conferences'),
this.makeItem(ItemTypes.InfoMessage, '-'.repeat(70)),
this.makeItem(ItemTypes.InfoMessage, ''),
...messageConferences.map(conf =>
this.makeItem(
ItemTypes.SubMenu,
`${conf.name} ${conf.desc ? '- ' + conf.desc : ''}`,
`/msgarea/${conf.confTag}`
)
),
].join('');
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this.log.debug('Gopher serving message conference list');
return cb(response);
}
_exposedMessageConferenceTags(obj) {
return Object.keys(obj || {})
.map(confTag =>
Object.assign({ confTag }, getMessageConferenceByTag(confTag))
)
.filter(conf => conf); // remove any baddies
}
_noExposedMessageConferences(cb) {
return cb(
this.makeItem(ItemTypes.InfoMessage, 'No message conferences available')
);
}
// newer format
_listExposedMessageConferences(cb) {
let exposedConfs = _.get(Config(), 'contentServers.gopher.exposedConfAreas');
if (!_.isObject(exposedConfs)) {
return this._listExposedMessageConferencesLegacy(cb);
}
exposedConfs = this._exposedMessageConferenceTags(exposedConfs);
if (0 === exposedConfs.length) {
return this._noExposedMessageConferences(cb);
}
return this._makeAvailableMessageConferencesResponse(exposedConfs, cb);
}
// older deprecated format
_listExposedMessageConferencesLegacy(cb) {
const exposedConfs = this._exposedMessageConferenceTags(
_.get(Config(), 'contentServers.gopher.messageConferences')
);
if (0 === exposedConfs.length) {
return this._noExposedMessageConferences(cb);
}
return this._makeAvailableMessageConferencesResponse(exposedConfs, cb);
}
_makeAvailableMessageAreasResponse(exposedConf, exposedAreas, cb) {
// ensure nothing private is present
exposedAreas = exposedAreas.filter(
area => area && !Message.isPrivateAreaTag(area.areaTag)
);
if (0 === exposedAreas.length) {
return cb(this.makeItem(ItemTypes.InfoMessage, 'No message areas available'));
}
sortAreasOrConfs(exposedAreas);
const response = [
this.makeItem(ItemTypes.InfoMessage, '-'.repeat(70)),
this.makeItem(ItemTypes.InfoMessage, `Message areas in ${exposedConf.name}`),
this.makeItem(ItemTypes.InfoMessage, '-'.repeat(70)),
...exposedAreas.map(area =>
this.makeItem(
ItemTypes.SubMenu,
`${area.name} ${area.desc ? '- ' + area.desc : ''}`,
`/msgarea/${exposedConf.confTag}/${area.areaTag}`
)
),
].join('');
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this.log.debug(
{ confTag: exposedConf.confTag },
'Gopher serving message area list'
);
return cb(response);
}
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_listExposedMessageConferenceAreas(selectorMatch, confTag, cb) {
//
// New system -- exposedConfAreas:
// We have a required array |include| of area tags that may
// contain wildcards and a _optional_ |exclude| array that
// overrides any includes
//
// Deprecated -- messageConferences:
// The key should point to an array of area tags
//
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const [confConfig, isLegacy] = this._getConfigForConferenceTag(confTag);
const messageConference = getMessageConferenceByTag(confTag); // we need the actual conf!
if (!messageConference) {
return this.notFoundGenerator(selectorMatch, cb);
}
let areas;
if (isLegacy) {
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areas = (confConfig || []).map(areaTag =>
Object.assign({ areaTag }, getMessageAreaByTag(areaTag))
);
} else {
// new system is more complex here, but nicer for the +op to manage
areas = getAvailableMessageAreasByConfTag(confTag);
if (!Array.isArray(confConfig.include)) {
return cb(
this.makeItem(ItemTypes.InfoMessage, 'No message areas available')
);
}
// filters |areas| down to what |includes| matches
areas = _.filter(areas, (area, areaTag) => {
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for (let rule of confConfig.include) {
if (wildcardMatch(areaTag, rule)) {
area.areaTag = areaTag;
return true;
}
}
return false;
});
// now filter out any excludes, if present
if (Array.isArray(confConfig.exclude)) {
areas = _.filter(areas, area => {
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for (let rule of confConfig.exclude) {
if (wildcardMatch(area.areaTag, rule)) {
return false;
}
}
return true;
});
}
}
return this._makeAvailableMessageAreasResponse(messageConference, areas, cb);
}
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_listMessagesInArea(selectorMatch, confTag, areaTag, area, cb) {
if (Message.isPrivateAreaTag(areaTag)) {
this.log.warn({ areaTag }, `Gopher attempted access to private "${areaTag}"`);
return cb(this.makeItem(ItemTypes.InfoMessage, 'Area is private'));
}
if (!area || !this.isAreaAndConfExposed(confTag, areaTag)) {
this.log.warn(
{ confTag, areaTag },
`Gopher attempted access to non-exposed "${confTag}"/"${areaTag}"`
);
return this.notFoundGenerator(selectorMatch, cb);
}
const filter = {
resultType: 'messageList',
sort: 'messageId',
order: 'descending', // we want newest messages first for Gopher
};
return getMessageListForArea(null, areaTag, filter, (err, msgList) => {
const response = [
this.makeItem(ItemTypes.InfoMessage, '-'.repeat(70)),
this.makeItem(ItemTypes.InfoMessage, `Messages in ${area.name}`),
this.makeItem(ItemTypes.InfoMessage, '(newest first)'),
this.makeItem(ItemTypes.InfoMessage, '-'.repeat(70)),
...msgList.map(msg =>
this.makeItem(
ItemTypes.TextFile,
`${moment(msg.modTimestamp).format(
'YYYY-MM-DD hh:mma'
)}: ${this.shortenSubject(msg.subject)} (${
msg.fromUserName
} to ${msg.toUserName})`,
`/msgarea/${confTag}/${areaTag}/${msg.messageUuid}`
)
),
].join('');
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this.log.debug({ confTag, areaTag }, 'Gopher serving message list');
return cb(response);
});
}
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_displayMessage(selectorMatch, msgUuid, confTag, areaTag, cb) {
const message = new Message();
return message.load({ uuid: msgUuid }, err => {
if (err) {
this.log.debug(
{ uuid: msgUuid },
'Attempted access to non-existent message UUID!'
);
return this.notFoundGenerator(selectorMatch, cb);
}
if (
message.areaTag !== areaTag ||
!this.isAreaAndConfExposed(confTag, areaTag)
) {
this.log.warn(
{ areaTag },
`Gopher attempted access to non-exposed "${confTag}"/"${areaTag}"`
);
return this.notFoundGenerator(selectorMatch, cb);
}
if (Message.isPrivateAreaTag(areaTag)) {
this.log.warn(
{ areaTag },
`Gopher attempted access to message in private "${areaTag}"`
);
return this.notFoundGenerator(selectorMatch, cb);
}
this.prepareMessageBody(message.message, msgBody => {
const response = `${'-'.repeat(70)}
To : ${message.toUserName}
From : ${message.fromUserName}
When : ${moment(message.modTimestamp).format('dddd, MMMM Do YYYY, h:mm:ss a (UTCZ)')}
Subject: ${message.subject}
ID : ${message.messageUuid} (${message.messageId})
${'-'.repeat(70)}
${msgBody}
`;
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this.log.debug(
{
confTag,
areaTag,
uuid: message.messageUuid,
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},
`Gopher serving message "${message.subject}"`
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);
return cb(response);
});
});
}
};