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var path = require('path');
var crc = require('crc');
var editHTMLElement = require('./editHTMLElement');
var fs = require('../../utils/fs');
var LocationUtils = require('../../utils/location');
/**
Fetch all remote images
@param {String} rootFolder
@param {String} currentFile
@param {HTMLDom} $
@return {Promise}
*/
function fetchRemoteImages(rootFolder, currentFile, $) {
var currentDirectory = path.dirname(currentFile);
return editHTMLElement($, 'img', function($img) {
var src = $img.attr('src');
var extension = path.extname(src);
if (!LocationUtils.isExternal(src)) {
return;
}
// We avoid generating twice the same PNG
var hash = crc.crc32(src).toString(16);
var fileName = hash + extension;
var filePath = path.join(rootFolder, fileName);
return fs.assertFile(filePath, function() {
return fs.download(src, filePath);
})
.then(function() {
// Convert to relative
src = LocationUtils.relative(currentDirectory, fileName);
$img.replaceWith('<img src="' + src + '" />');
});
});
}
module.exports = fetchRemoteImages;
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