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scraper.js
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scraper.js
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"use strict";
var _ = require('lodash');
var fs = require('fs');
var cheerio = require('cheerio');
var request = require('request');
var queue = require('./queue.js');
var url = require('url');
var re = /\/web\/[\d]+\//;
var default_timestamp = "19950101";
var min_score = 0;
var max_year = 1998;
var pages = require('./pages.js');
var wordfilter = require('wordfilter');
wordfilter.addWords(['nude', 'naked', 'xxx', 'porn', 'murder']);
var add_new_urls = false;
var scrape_rate = 5000;
/**
* run without checking if a page has aleady been scraped
*/
var alwaysRun = function(val) {
queue.alwaysRun(val);
};
/**
* load a single URL from the wayback machine at the specified timestamp,
* make sure it was relatively valid, then pass to callbacka
*/
var scrapeUrl = function(url, timestamp, cb, onError) {
var target = "http://web.archive.org/web/" + timestamp + "/" + url;
//console.log(target);
request(target, function (error, response, body) {
if ( error || response.statusCode !== 200 ) {
//console.log("ERR: " + error);
//console.log("response: " + response);
if ( typeof(onError) !== "undefined" ) {
onError(error, response);
}
}
// make sure there was no error, that this was a 200 response, and that it's HTML-ish
if (!error && response.statusCode == 200 && response.headers['content-type'].indexOf("text/html") !== -1 ) {
//console.log("got valid response, send it along");
cb(body, response.request.href);
}
});
};
/**
* remove the wayback header from the output so we don't include it in parsing
*/
var parseAndClean = function(contents) {
var $ = cheerio.load(contents);
$("#wm-ipp").remove();
return $;
};
/**
* parse out some page attributes for storing later
*/
var getPageAttrs = function(contents) {
var $ = parseAndClean(contents);
var attrs = {
title: $("title").text(),
generator: ""
};
var m = $('meta[name="generator"]').get(0);
if ( typeof(m) !== "undefined" ) {
attrs.generator = m.attribs.content;
}
return attrs;
};
/**
* find a list of URLs on the page, remove the wayback prefixes, and return
*/
var urlsToScrape = function(contents, u) {
var $ = parseAndClean(contents);
if ( typeof(u) == "undefined" ) {
u = "";
}
return _.uniq(
_.select(
$('body').find("a").map(function(i, a) {
// grab the href from any links. the replace here should strip /web/timestamp/
var href = undefined;
if ( a.attribs && a.attribs.href ) {
href = a.attribs.href.replace(re, "");
try {
href = url.resolve(u, href);
}
catch(e) {
console.log("URL error: " + href);
console.log(e);
href = undefined;
}
}
return href;
}),
function(url) {
// strip out some obviously junky URLs
return typeof(url) !== "undefined" &&
url.indexOf('http') !== -1 &&
url.indexOf('_vti') === -1 &&
url.indexOf("yahoo.com/Regional/") === -1 &&
url.indexOf("yahoo.com/bin") === -1 &&
url.indexOf("yahoo.com/SpaceID") === -1 &&
url.length > 1;
})
);
};
/**
* do a couple basic tests to make sure this is a page we might want to render/store. basically
* make sure it's a 200 and doesn't have an old meta-refresh on it
*/
var invalidPage = function(c) {
return c.indexOf('<p class="code">Redirecting to...</p>') > -1 ||
c.indexOf('<p>Wayback Machine doesn't have that page archived.</p>') > -1 ||
c.toLowerCase().indexOf('http-equiv="refresh"') > -1 ||
c.toLowerCase().indexOf('http-equiv=refresh') > -1;
};
/**
* look for a potential redirect url on this page
*/
var findRedirect = function(c) {
var result = undefined;
var $ = cheerio.load(c);
var meta = $("meta[http-equiv]");
if ( c.indexOf('<p class="code">Redirecting to...</p>') > 0 ) {
result = $(".impatient a").get(0).attribs.href;
result = result.replace(re, "");
}
else if ( meta.length > 0 ) {
//console.log("**** " + meta.get(0).attribs.content);
//console.log("**** " + meta.get(0).attribs.content.split(/; *url=/i)[1]);
result = meta.get(0).attribs;
if (typeof(result) !== "undefined") {
result = result.content.split(/; *url=/i);
if ( typeof(result) === 'object' && result.length > 1 ) {
var dest = result[1].replace(re, "");
return dest;
}
}
result = undefined; // tmp hack
}
return result;
};
/**
* generate a fairly arbitrary 'score' for the page. Not really used right now
*/
var score = function(url, body) {
// Scraper scoring
// Number of buzzwords
// Number of images
// Number of tags
var $ = cheerio.load(body);
var tags = $("*").length;
var images = $("img").length;
var tildes = (url.indexOf("~") !== -1) ? 100 : 0;
//console.log("tags: " + tags + " images: " + images + " tildes: " + tildes);
return tags + images + tildes;
};
/**
* scrape the specified URL
*/
var scrape = function(u) {
//console.log("lets scrape", u);
if ( typeof(u) === "undefined" ) {
console.log("nothing to scrape!");
return;
}
queue.runOnce(u, function() {
scrapeUrl(u, default_timestamp, function(body, _url) {
console.log("actual url: " + _url);
var tstamp = _url.split('/')[4];
var year = parseInt(tstamp.substr(0, 4), 10);
//console.log("YEAR: " + year);
if ( year > max_year ) {
console.log("oops, this page is from " + year);
return;
}
if ( invalidPage(body) ) {
//console.log("looks like " + u + " didn't return a 200, bye");
var r = findRedirect(body);
if ( typeof(r) !== "undefined" ) {
//console.log("let's scrape redirect " + r + " at some point");
queue.add([r]);
}
return;
}
var page_score = score(u, body);
var attrs = getPageAttrs(body);
if ( page_score > min_score ) {
//console.log("score: " + page_score + " looks good, let's store it");
if ( add_new_urls == true ) {
var urls = urlsToScrape(body, u);
if ( urls.length > 0 ) {
queue.add(urls);
}
}
//
// we'll auto-approve pages that don't have bad words on them
// and don't have long strings of numbers (phone numbers, etc)
//
var approved_at;
var $ = cheerio.load(body.replace(/</g, ' <'));
var test_text = $("body").first().text().replace(/ +/g, " ");
if ( test_text.match(/[\(\+]?\b[ 0-9\-\(\)+^'^"^<^>]{10,14}\b/g) === null &&
! wordfilter.blacklisted(test_text) ) {
approved_at = new Date();
}
if ( u.indexOf("yahoo.com") === -1 ) {
var h = url.parse(u).host;
pages.add({
url: u,
host: h,
body: body,
score: page_score,
tstamp: tstamp,
title: attrs.title,
generator: attrs.generator,
content: body,
approved_at: approved_at
});
}
else {
//console.log("we will scrape yahoo pages but not store them in mysql");
}
}
else {
//console.log("this page wasn't cool enough, sorry :(");
}
});
});
};
/**
* grab a url from the queue and scrape it
*/
var run = function() {
var q = require('./queue.js');
q.get(function(url) {
try {
scrape(url);
}
catch(e) {
console.log(";(", e);
}
});
};
/**
* main loop. run forever!
*/
var loop = function() {
console.log("ok, running forever!");
var q = require('./queue.js');
setInterval(function() {
console.log("*");
run();
}, scrape_rate);
};
exports.alwaysRun = alwaysRun;
exports.scrapeUrl = scrapeUrl;
exports.urlsToScrape = urlsToScrape;
exports.scrape = scrape;
exports.run = run;
exports.loop = loop;