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index.js
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index.js
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const request = require('postman-request');
const stringify = require('csv-stringify');
const cheerio = require('cheerio');
const fs = require('fs');
const program = require('commander');
const CSV = require('csv-string');
program
.description('scrape news articles matching a keyword in a given time range \n e.g. \n node index.js --keyword potato --startdate 06-01-2018 --enddate 06-01-2019 --medium wp')
.option('-k, --keyword <keyword>', 'keyword you are searching for')
.option('-s, --startdate <startdate>', 'start date')
.option('-e, --enddate <enddate>', 'end date')
.option('-m, --medium <medium>', 'medium (wp=washington post, politico');
program.parse(process.argv);
console.log(program.opts());
if (program.keyword) console.log(program.keyword);
if (program.startdate) console.log(program.startdate);
if (program.enddate) console.log(program.enddate);
let keyword = program.keyword;
let start_date = new Date(program.startdate);
let end_date = new Date(program.enddate);
let results_stored = [];
run();
function getOverview(medium,offset,number_of_results){
if(medium == 'wp')
return getOverviewWP(offset,number_of_results)
if(medium == 'politico')
return getOverviewPolitico(offset,number_of_results)
}
function getOverviewPolitico(offset,number_of_results){
offset = parseInt(offset)+1;
let url = `https://www.politico.com/search/${offset}?s=newest&q=${keyword}&adv=true&start=06/01/2018&end=06/01/2019&c=0000016c-7218-df3f-a1fe-779a301e0006`;
console.log(url);
return new Promise(function(resolve, reject) {
request.get(url, function(error,response,data) {
const $ = cheerio.load(data);
if(error)
reject(error);
let results = [];
$('.story-frag-list.layout-linear li').each(function(i, elem) {
let pubdatetime = $(this).find('.meta').text().trim();
let category = $(this).find('.category').text().trim();
let title = $(this).find('header h3 a').text().trim();
let link = $(this).find('header h3 a').attr('href').trim();
let systemid = link;
let img = $(this).find('.thumb img').attr('data-lazy-img').trim();
let teaser = $(this).find('.tease').text().trim();
results.push({
systemid,
pubdatetime,
title,
category,
link,
img,
teaser
});
//console.log($(this).text());
//fruits[i] = $(this).text();
//console.lo
});
resolve({documents:results});
});
});
}
function getOverviewWP(offset,number_of_results){
offset = offset*number_of_results;
if(typeof offset == 'undefined'){
offset = 0;
}
if(typeof number_of_results == 'undefined'){
number_of_results = 20;
}
// crawl all articles since 2005 => let url = `https://sitesearchapp.washingtonpost.com/sitesearch-api/v2/search.json?count=${number_of_results}&datefilter=displaydatetime:%5B*+TO+NOW%2FDAY%2B1DAY%5D&facets.fields=%7B!ex%3Dinclude%7Dcontenttype,%7B!ex%3Dinclude%7Dname&highlight.fields=headline,body&highlight.on=true&highlight.snippets=1&query=${keyword}&sort=displaydatetime+desc&startat=${offset}`;
let crawlingperiod = '3YEARS+TO+NOW';
let url = `https://sitesearchapp.washingtonpost.com/sitesearch-api/v2/search.json?count=${number_of_results}&datefilter=displaydatetime:%5BNOW%2FDAY-${crawlingperiod}%2FDAY%2B1DAY%5D&facets.fields=%7B!ex%3Dinclude%7Dcontenttype,%7B!ex%3Dinclude%7Dname&highlight.fields=headline,body&highlight.on=true&filter=%7B!tag%3Dinclude%7Dcontenttype:("Article")&highlight.snippets=1&query=${keyword}&sort=displaydatetime+desc&startat=${offset}`;
console.log(url);
return new Promise(function(resolve, reject) {
request(url, function (error, response, body) {
if(error)
reject(error)
let result = JSON.parse(body);
resolve({documents:result.results.documents})
});
});
}
function storeHeader(medium, writeStream){
let new_line = [];
let field_array;
if(medium == 'wp'){
field_array = ['systemid','contenttype','contenturl','headline','mobileheadline','sourcenav','byline','pubdatetime','pubdatetimestring','displaydatetime','primarysection','blurb','keyword','smallthumburl'];
}else if(medium == 'politico'){
field_array = ['systemid','link','date','title','category','teaser','img'];
}
for(let i in field_array){
new_line.push(field_array[i]);
}
writeStream.write(new_line.join(',')+ '\n', () => {
// a line was written to stream
})
}
function storeResult(medium,writeStream, result){
let field_array;
if(medium == 'wp'){
field_array = ['systemid','contenttype','contenturl','headline','mobileheadline','sourcenav','byline','pubdatetime','pubdatetimestring','displaydatetime','primarysection','blurb','keyword','smallthumburl'];
}else if(medium == 'politico'){
field_array = ['systemid','link','date','title','category','teaser','img'];
}
console.log(result.contenttype,results_stored.indexOf(result.systemid));
if(results_stored.indexOf(result.systemid)>-1){
console.log('double', results_stored.indexOf(result.systemid));
console.log(result.systemid);
return false
}
else
results_stored.push(result.systemid);
let new_line = [];
for(let i in field_array){
if(typeof result[field_array[i]] == 'string'){
result[field_array[i]] = result[field_array[i]].replace(/(?:\r\n|\r|\n)/g, '<br>');
//let field = result[field_array[i]];
//if(result[field_array[i]].indexOf(',') > -1)
//die();
}
if(result[field_array[i]])
new_line.push(result[field_array[i]]);
else
new_line.push('');
}
console.log(new_line.join(','));
return new Promise(function(resolve, reject) {
writeStream.write(CSV.stringify(new_line), () => {
// a line was written to stream
resolve();
})
});
}
function run(){
(async function loop() {
let start_offset = 0;
let number_of_results=1000;
let max_iterations = 1000;
let medium = program.medium;
let results = [];
console.log('medium',medium);
//open writestream
let writeStream = fs.createWriteStream(medium+'-'+keyword+'.csv');
storeHeader(medium,writeStream);
for (let i = start_offset; i < max_iterations; i++) {
console.log('max_iterations',max_iterations);
let result = await getOverview(medium,i, number_of_results);
if(i == start_offset){
//storeHeader(writeStream,result.documents[0]);
//max_iterations = result.total/number_of_results;
}
//console.log('result');
//console.log(result);
if(result.documents&&result.documents.length>0){
for(let n in result.documents){
let document_date = new Date(result.documents[n].pubdatetime);
if(+document_date >= +start_date&&+document_date <= +end_date){
console.log('hit');
console.log(document_date);
if(result.documents[n]){
//delete result.documents[i].keyword;
result.documents[n].pubdatetimestring = document_date;
//console.log(result.documents[i]);
if(typeof result.documents[n].keyword == 'object')
result.documents[n].keyword = result.documents[i].keyword.join(',');
//console.log(result.documents[i]);
//await csvWriter.writeRecords(result.documents[i])
console.log('store result '+result.documents[n].systemid);
await storeResult(medium, writeStream,result.documents[n]);
//results.push(result.documents[i]);
//fs.writeFileSync('out_file.csv', csv);
}
}
}
}
console.log(i);
}
//close writestream
writeStream.end();
writeStream.on('finish', () => {
console.log('finish write stream')
}).on('error', (err) => {
console.log(err)
})
})();
}