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page.js
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page.js
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'use strict';
const fs = require('fs');
const handlebars = require('handlebars');
const server = require('./server.js');
// Add extra helpers to handlebars.
handlebars.registerHelper('if_eq', function(val1, val2, options) {
if (val1 === val2) {
return options.fn(this);
}
return options.inverse(this);
});
handlebars.registerHelper('if_id', function(val1, val2, options) {
if (toId(val1) === toId(val2)) {
return options.fn(this);
}
return options.inverse(this);
});
handlebars.registerHelper('if_ends', function(val1, val2, options) {
if (val1.endsWith(val2)) {
return options.fn(this);
}
return options.inverse(this);
});
handlebars.registerHelper('mod', function(variable, num, eq, options) {
if (variable % num === eq) {
return options.fn(this);
}
return options.inverse(this);
});
handlebars.registerHelper('parse_date', function(date) {
if (parseInt(date)) {
date = new Date(parseInt(date));
return date.toDateString();
}
return date;
});
handlebars.registerHelper('toId', function(str) {
return toId(str);
});
handlebars.registerHelper('parse_duration', function(time) {
let number = Date.now() - time;
const date = new Date(+number);
const parts = [date.getUTCFullYear() - 1970, date.getUTCMonth(), date.getUTCDate() - 1, date.getUTCHours(), date.getUTCMinutes(), date.getUTCSeconds()];
const unitNames = ["second", "minute", "hour", "day", "month", "year"];
const positiveIndex = parts.findIndex(elem => elem > 0);
return parts.slice(positiveIndex).reverse().map((value, index) => value ? value + " " + unitNames[index] + (value > 1 ? "s" : "") : "").reverse().join(" ").trim();
});
let header;
try {
header = fs.readFileSync('./templates/header.html', "utf8");
} catch (e) {
Output.errorMsg(e, `Could not load header template.`);
}
handlebars.registerPartial('header', header);
class Page {
constructor(filename, contextGenerator, template, options = {}) {
this.filename = filename;
this.rooms = options.rooms || [];
this.context = contextGenerator;
try {
let data = fs.readFileSync(`./templates/${template}`, "utf8");
this.template = handlebars.compile(data);
} catch (e) {
Output.errorMsg(e, `Could not load template '${template}'.`);
}
this.token = options.token;
this.optionalToken = options.optionalToken;
this.postHandler = options.postHandler;
this.postDataType = options.postDataType || 'JSON';
for (let room of this.rooms) {
server.addRoute(`/${room}/${this.filename}`, (req, res) => this.resolve(req, res));
}
server.restart();
}
addRoom(room) {
this.rooms.push(room);
server.addRoute(`/${room}/${this.filename}`, (req, res) => this.resolve(req, res));
}
static parseURL(url) {
let split = url.split('?');
if (split.length === 1) return {};
let query = split[1];
let parts = query.split('&');
let output = {};
for (let i = 0; i < parts.length; i++) {
let elem = parts[i].split('=');
if (elem.length === 2) {
output[elem[0]] = elem[1];
}
}
return output;
}
async resolve(req, res) {
let room = req.originalUrl.split('/')[1];
let query = Page.parseURL(req.url);
let token = query.token;
let tokenData;
if (this.token) {
if (!token && !this.optionalToken) return res.end('Please attach an access token. (You should get one when you type the command in PM)');
tokenData = server.getAccessToken(token);
if (token) {
if (!tokenData || !(this.token in tokenData) || room !== tokenData.room) return res.end('Invalid access token.');
if (req.method === "POST" && this.postHandler) {
if (!tokenData[this.token]) return res.end("Permission denied.");
if (!(req.body)) return res.end("Malformed request.");
let data;
if (this.postDataType === 'JSON') {
try {
data = JSON.parse(decodeURIComponent(req.body.data || req.body));
} catch (e) {
return res.end("Malformed JSON.");
}
} else if (this.postDataType === 'js') {
data = req.body.data || req.body;
} else {
data = req.body.data || req.body;
}
await this.postHandler(data, room, tokenData, query);
}
}
}
let content = await this.context(room, query, tokenData, req.url);
if (typeof content === 'string') return res.end(content);
return res.end(this.template(content));
}
getUrl(room, userid, permission = true, options = {}, noToken = false, tokenData = {}) {
if (!this.rooms.includes(room)) return false;
let fname = `${room}/${this.filename}`;
if (this.token && !noToken) {
tokenData.room = room;
tokenData.user = userid;
tokenData[this.token] = permission;
options.token = server.createAccessToken(tokenData, 60);
}
let optionString = Object.keys(options).map(opt => `${toId(opt)}=${toId(options[opt])}`).join('&');
if (optionString) fname += `?${optionString}`;
return `${server.url}${fname}`;
}
}
module.exports = Page;