| 1 | 'use strict';
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| 2 |
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| 3 | var format = require('util').format,
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| 4 | MAX_LENGTH = 4 * 1024;
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| 5 |
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| 6 | function rule(analyzer) {
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| 7 |
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| 8 | var re = /data:.+\/(.+);base64,(.*)\)/;
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| 9 | analyzer.setMetric('base64Length');
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| 10 |
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| 11 | analyzer.on('declaration', function(rule, property, value) {
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| 12 | var base64,
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| 13 | buf,
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| 14 | matches;
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| 15 |
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| 16 | if (re.test(value)) {
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| 17 |
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| 18 | matches = value.match(re);
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| 19 | base64 = matches[2];
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| 20 | buf = new Buffer(base64, 'base64');
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| 21 |
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| 22 | analyzer.incrMetric('base64Length', base64.length);
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| 23 |
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| 24 | if (base64.length > MAX_LENGTH) {
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| 25 | analyzer.addOffender('base64Length', format('%s { %s: ... } // base64: %s kB, raw: %s kB', rule.selectors.join(', '), property, (base64.length / 1024).toFixed(2), (buf.length / 1024).toFixed(2)));
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| 26 | }
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| 27 | }
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| 28 | });
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| 29 | }
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| 30 |
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| 31 | rule.description = 'Reports on base64-encoded images';
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| 32 | module.exports = rule;
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