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server.js
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server.js
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//Inspired by https://scotch.io/tutorials/scraping-the-web-with-node-js
var express = require('express');
var rp = require('request-promise');
var cheerio = require('cheerio');
var app = express();
var _ = require('lodash');
var URI = require('urijs');
app.get('/crosswords/guardian/:type?/:number(\\d+)', function(req, res) {
return createCrosswordJson(req, res);
});
app.get('/crosswords/guardian/:type?', function(req, res) {
return redirectToLatestCrossword(req, res);
});
function redirectToLatestCrossword(req, res) {
var crosswordType = getCrosswordType(req.params.type);
return getLatestCrosswordNumber(crosswordType).then(function(crosswordNumber) {
res.redirect("/crosswords/guardian/" + crosswordType + "/" + crosswordNumber);
});
}
function createCrosswordJson(req, res) {
var crosswordType = getCrosswordType(req.params.type);
var crosswordNumber = req.params.number;
return getClues(crosswordNumber, crosswordType)
.then(parseClues)
.then(function(parsedClues) {
returnClueJson(parsedClues, res);
})
.catch(function(error) {
res.status(500).send(error.message);
});
}
function getCrosswordType(type) {
if (!type) {
return 'cryptic';
}
var allowedTypes = ['cryptic', 'quick', 'quiptic', 'speedy', 'prize', 'everyman'];
if (_.includes(allowedTypes, type)) {
return type;
}
throw new Error('crossword type not recognised');
}
function getLatestCrosswordNumber(crosswordType) {
var url = new URI('https://www.theguardian.com/crosswords/series/')
.segment(crosswordType)
.toString();
return rp(url)
.catch(function() {
throw new Error("Could not access the series of " + crosswordType + " crosswords");
})
.then(function(html){
var $ = cheerio.load(html);
var crosswordNumbers = $('a')
.filter(function(){
var href = $(this).attr('href');
return href && href.startsWith("https://www.theguardian.com/crosswords/" + crosswordType)
})
.map(function() {
return _.last(new URI($(this).attr('href')).segment());
});
crosswordNumbers = _.filter(crosswordNumbers, function(num) {
return num.match(/^\d+$/);
});
return _.max(crosswordNumbers);
});
}
function getClues(crosswordNumber, crosswordType) {
var url = new URI('https://www.theguardian.com/crosswords/accessible/')
.segment(crosswordType)
.segment(crosswordNumber)
.toString();
return rp(url)
.catch(function() {
throw new Error("Could not access " + crosswordType + " crossword number " + crosswordNumber);
})
.then(function(html){
var $ = cheerio.load(html);
var clueElements = $('.crossword__clue');
return _.map(clueElements, function(clueElement) {
return fetchClueDetails($(clueElement));
});
});
}
function fetchClueDetails(clueElement) {
return {
text: clueElement.text(),
number: clueElement.attr('value'),
across: clueElement.parent().parent().attr('class') === "crossword__clues--across"
};
}
function parseClues(clues) {
return _.map(clues, parseClue);
}
function parseClue(clue) {
// Format is e.g. "(2D) Fresh poem search by a nose (5,4)"
var standardFormat = /^\((.*)\) (.*) \((.*)\)$/;
var match = clue.text.match(standardFormat);
if (match) {
clue.type = 'standard';
clue.startLocation = match[1];
clue.clue = match[2];
clue.wordLengths = match[3];
delete clue.text;
return clue;
}
// Format is e.g. "(4D) See 1A"
var seeOtherClueFormat = /^\((.*)\) See (.*)$/;
match = clue.text.match(seeOtherClueFormat);
if (match) {
clue.type = 'seeOther';
clue.startLocation = match[1];
clue.seeOther = match[2];
delete clue.text;
return clue;
}
throw new Error("Clue didn't match any known format");
}
function returnClueJson(parsedClues, res) {
res.setHeader('Content-Type', 'application/json');
res.send(JSON.stringify(parsedClues));
}
//Navigate to e.g. http://localhost:8081/crosswords/guardian to run
app.listen('8081');
exports = module.exports = app;