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dataunwrapper.js
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dataunwrapper.js
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#!/usr/bin/env node
const https = require('https');
const url = require('url');
const dataunwrapper = module.exports = function(id, fn){
if (!id) return fn("usage: dataunwrapper <id>");
if (!/^[a-z0-9]+$/i.test(id)) fn("invalid id");
// resolve metatag-redirect
https.get('https://datawrapper.dwcdn.net/'+id+'/', function(res){
if (res.statusCode !== 200) fn("response: http status "+res.statusCode);
let content = [];
res.on('error', function(err){
fn(err);
}).on('data', function(chunk){
content.push(chunk);
}).on('end', function(){
content = content.join("");
if (!/<meta http-equiv="REFRESH" content="0; url=(.*?)\/([a-z0-9]+)\/([0-9]+)\/">/i.test(content)) return console.log(RegExp.$0),fn(new Error("No version redirect found"));
const ver = RegExp.$3;
// fetch content
https.get('https://datawrapper.dwcdn.net/'+id+'/'+ver+'/', function(res){
if (res.statusCode !== 200) fn("response: http status "+res.statusCode);
let content = [];
res.on('error', function(err){
fn(err);
}).on('data', function(chunk){
content.push(chunk);
}).on('end', function(){
extract(content.join(""), fn);
});
});
});
});
};
// extract inline data from over-webpacked code
const extract = module.exports.extract = function(content, fn){
// new svelte version, extract __DW_SVELTE_PROPS__ blob
if (/window\.__DW_SVELTE_PROPS__/.test(content) && /window\.__DW_SVELTE_PROPS__ = JSON\.parse\("([^\n]+)"\);\n/.test(content)) {
let data;
try {
data = JSON.parse(JSON.parse("\""+RegExp.$1+"\""));
} catch (err) {
return fn(err);
}
// check for version override (datawrapper publishes the wrong version in their inline data)
let versionOverride = false;
if (/<link rel="alternate" type="application\/json\+oembed"(\s+)href="https:\/\/api\.datawrapper\.de\/v3\/oembed\?url=https:\/\/datawrapper\.dwcdn\.net\/([^\/]+)\/([0-9]+)\/&format=json"(\s+)title="oEmbed" \/>/.test(content)) {
versionOverride = RegExp.$3;
}
let dataurl;
if (!!data.chart.externalData) {
dataurl = data.chart.externalData;
} else {
// find csv endpoint in __DW_SVELTE_PROPS__ blob
if (!data.hasOwnProperty("assets") || typeof data.assets !== "object") return fn(new Error("data.assets not present"));
const endpoint = Object.keys(data.assets).find(function(k){
return /\.csv$/.test(k);
});
if (!endpoint) return fn(new Error("csv url not found in data.assets"));
// override version
if (versionOverride) data.chart.publicUrl = data.chart.publicUrl.replace(/\/[0-9]+\/?$/,'/'+versionOverride+'/');
dataurl = url.resolve(data.chart.publicUrl, data.assets[endpoint].url);
}
// get csv from url
https.get(dataurl, function(res){
if (res.statusCode !== 200) fn("response: http status "+res.statusCode);
let content = [];
res.on('error', function(err){
fn(err);
}).on('data', function(chunk){
content.push(chunk);
}).on('end', function(){
return fn(null, content.join(""))
});
});
return;
}
// most common
if (/\\"(?:data|chartData)/.test(content) && /\\"(?:data|chartData)\\":\\"(.*?[^\\])\\",/.test(content)) {
try {
let data = JSON.parse("\""+JSON.parse("\""+RegExp.$1+"\"")+"\"");
} catch (err) {
return fn(err);
}
return fn(null, data);
}
// less common
if (/render\(\{/.test(content) && /render\(\{(.*?)\schartData: "(.*?)",?\n(.*?)\}\);/s.test(content)) {
try {
let data = JSON.parse('"'+RegExp.$2+'"');
} catch (err) {
return fn(err);
}
return fn(null, data);
}
// way less common
if (/__dw\.init\(\{/.test(content) && /__dw\.init\(\{(.*?)\sdata: "(.*?)",?\n(.*?)\}\);/s.test(content)) {
try {
let data = JSON.parse('"'+RegExp.$2+'"');
} catch (err) {
return fn(err);
}
return fn(null, data);
}
// only found once
if (/__dw\.init\(\$\.extend\(\{/.test(content) && /__dw\.init\(\$\.extend\(\{(.*?)\sdata: "(.*?)",?\n(.*?)\}, window\.__dwParams\)\);/s.test(content)) {
try {
let data = JSON.parse('"'+RegExp.$2+'"');
} catch (err) {
return fn(err);
}
return fn(null, data);
}
// report a bug if you find a non-functioning version
return fn(new Error("could not find data"));
};
if (require.main === module) dataunwrapper(process.argv[2], function(err, data){
if (err) console.error(err.toString()), process.exit(1);
console.log(data);
});