@passmarked/seo
Version:
Rules related to checking for any SEO issues on the page given
150 lines (99 loc) • 3.1 kB
JavaScript
// load in the required modules
const cheerio = require('cheerio')
const url = require('url')
const S = require('string')
const _ = require('underscore')
// expose the items
module.exports = exports = function(payload, fn) {
// get the url
var data = payload.getData();
// get the page content
payload.getPageContent(function(err, content) {
// did we get a error ?
if(err) {
// debug
payload.error('Got a error trying to get the page content', err)
// done
return fn(null)
}
// should not be empty
if(S(content).isEmpty() === true) {
// debug
payload.warning('Content was blank skipping');
// done
return fn(null);
}
// load up cheerio
var $ = cheerio.load(content);
// get the count of tags
var headCount = $('link[rel=canonical]').length || 0;
// check for title tags
if(headCount === 0) {
// finish
return fn(null);
}
// keep track of the last line
var lastLine = -1;
// the list of known titles
var knownTitleElements = [];
// parse the lines
var lines = content.split('\n');
// loop all the title tags in the head
$('link[rel=canonical]').each(function(index, elem) {
// local reference
var parentTag = ((($(elem).parent() || {})['0'] || {}).name || '').toLowerCase();
var value = $(elem).attr('href') || '';
// build the code
var build = payload.getSnippetManager().build(lines, lastLine, function(line) {
return line.toLowerCase().indexOf('<link') != -1 &&
line.toLowerCase().indexOf('rel') != -1 &&
line.toLowerCase().indexOf('canonical') != -1;
});
// must find the build
if(!build) return;
// set to subject
lastLine = build.subject;
// check if there are more than 1
if(headCount > 1) {
// add the line
payload.addRule({
type: 'error',
key: 'canonical.multiple',
message: 'Multiple document canonical links were found on the page'
}, {
display: 'code',
code: build,
message: S(value).trim().s
});
}
// check if under head
if(parentTag != 'head') {
// add the line
payload.addRule({
type: 'error',
key: 'canonical.location',
message: 'Document canonical link must be in the <head> section'
}, {
display: 'code',
code: build,
message: S(value).trim().s
});
}
// check if empty
if(S(value || '').trim().isEmpty() === true) {
// add a error ...
payload.addRule({
type: 'error',
key: 'canonical.empty',
message: 'Document canonical link was empty'
}, {
display: 'code',
code: build,
message: 'Empty canonical on line #' + build.subject
});
}
});
// done ... ?
fn(null)
});
};