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mixins_after.js
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mixins_after.js
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// Data handlers (mixins after)
//
// TODO: probably need define priority
//
'use strict';
const _ = require('lodash');
const async = require('async');
const url = require('url');
const path = require('path');
const size = require('probe-image-size');
const utils = require('./utils');
const EmbedzaError = require('./utils/error');
const debug = require('debug')('embedza:mixins_after');
let mixinsAfter = [];
// Resolve snippet's href
//
// - '/img/icon.png' -> 'http://example.com/img/icon.png'
// - '//example.com/img/icon.png' -> 'http(s)://example.com/img/icon.png'
//
mixinsAfter.push({
id: 'resolve-href',
fn: function resolve_href_after_mixin(env, callback) {
debug('resolve-href');
env.result.snippets.forEach(snippet => {
if (!snippet.href) {
return; // continue
}
let urlObj = url.parse(snippet.href, false, true);
// If url is relative make it absolute from source
if (!urlObj.host && !urlObj.protocol) {
snippet.href = url.resolve(env.src, snippet.href);
return; // continue
}
// If url has no protocol (starts with `//`) - use from source
if (!urlObj.protocol) {
urlObj.protocol = url.parse(env.src).protocol;
snippet.href = url.format(urlObj);
}
});
debug('resolve-href: done');
callback();
}
});
// Detect content-type of snippet (if not defined yet)
//
mixinsAfter.push({
id: 'mime-detect',
fn: function mime_detect_after_mixin(env, callback) {
debug('mime-detect');
async.each(env.result.snippets, (snippet, next) => {
// If type already defined - skip
if (snippet.type) {
next();
return;
}
// Get path without get params
let pathname = url.parse(snippet.href).pathname;
if (pathname) {
// Get extension
let ext = path.extname(pathname);
// Detect type by extension
snippet.type = ({
'.mp4': 'video/mp4',
'.ogg': 'video/ogg',
'.webm': 'video/webm'
})[ext];
}
if (snippet.type) {
next();
return;
}
debug('mime-detect: request ' + snippet.href);
// Request content headers
env.self.request(snippet.href, { method: 'HEAD' }, (err, response) => {
debug('mime-detect: request finish');
if (err) {
next(err);
return;
}
if (response.statusCode !== 200) {
err = new EmbedzaError('Mime-detect mixin after handler: Bad response code: ' + response.statusCode);
err.code = 'EHTTP';
err.status = response.statusCode;
next(err);
return;
}
snippet.type = response.headers['content-type'].split(';')[0];
// If can't detect type - remove snippet
if (!snippet.type) {
env.result.snippets = _.without(env.result.snippets, snippet);
}
// Add tag html5 for html content
if (snippet.type === 'text/html' && snippet.tags.indexOf('html5') === -1) {
snippet.tags.push('html5');
}
next();
});
}, err => {
debug('mime-detect: done');
callback(err);
});
}
});
// Add ssl tag for https snippets
//
mixinsAfter.push({
id: 'ssl-force',
fn: function ssl_force_after_mixin(env, callback) {
debug('ssl-force');
env.result.snippets.forEach(snippet => {
if (snippet.href && url.parse(snippet.href).protocol === 'https:' && snippet.tags.indexOf('ssl') === -1) {
snippet.tags.push('ssl');
}
});
debug('ssl-force: done');
callback();
}
});
// Merge snippets by href
//
mixinsAfter.push({
id: 'merge',
fn: function merge_after_mixin(env, callback) {
debug('merge');
let snippets = {};
env.result.snippets.forEach(snippet => {
if (!snippets[snippet.href]) {
snippets[snippet.href] = snippet;
return; // continue
}
snippets[snippet.href].tags = _.union(snippets[snippet.href].tags, snippet.tags);
snippets[snippet.href].media = _.merge(snippets[snippet.href].media, snippet.media);
});
env.result.snippets = _.values(snippets);
debug('merge: done');
callback();
}
});
// Load image dimensions by url
//
// - url (String)
// - cache (Object)
// - callback (Function)
//
function loadImageSize(url, cache, callback) {
let cacheKey = 'image#' + url;
let ttl = 24 * 60 * 60 * 1000; // 1 day
// Try get image dimensions from cache
cache.get(cacheKey, (err, data) => {
if (err) {
callback(err);
return;
}
// If image dimensions in cache and not expired - return it
if (data && data.ts > Date.now() - ttl) {
callback(null, data.dimensions);
return;
}
// If no data in cache - fetch
size(url, (err, dimensions) => {
if (err) {
callback(err);
return;
}
// Save data to cache
cache.set(cacheKey, { dimensions: dimensions, ts: Date.now() }, err => {
if (err) {
callback(err);
return;
}
// Return data
callback(null, dimensions);
});
});
});
}
// Load images size
//
mixinsAfter.push({
id: 'image-size',
fn: function image_size_after_mixin(env, callback) {
debug('image-size');
// Create debounced loadImageSize function if not exists
if (!env.self.__loadImageSize__) {
env.self.__loadImageSize__ = utils.uniqueAsync((url, callback) => {
loadImageSize(url, env.self.__options__.cache, callback);
});
}
let supportedExt = [ '.bmp', '.gif', '.jpg', '.jpeg', '.png', '.psd', '.tif', '.tiff', '.webp', '.svg' ];
async.each(env.result.snippets, (snippet, next) => {
if (snippet.type !== 'image') {
next();
return;
}
if (snippet.media && snippet.media.width && snippet.media.height) {
next();
return;
}
if (supportedExt.indexOf(path.extname(url.parse(snippet.href).pathname).toLowerCase()) === -1) {
next();
return;
}
debug('image-size: load ' + snippet.href);
env.self.__loadImageSize__(snippet.href, (err, dimensions) => {
debug('image-size: load done');
if (err) {
next(err);
return;
}
if (dimensions.wUnits === 'px' && dimensions.hUnits === 'px') {
snippet.media = snippet.media || {};
snippet.media.width = dimensions.width;
snippet.media.height = dimensions.height;
}
next();
});
}, err => {
debug('image-size: done');
callback(err);
});
}
});
// Set autoplay parameter to `snippet.media`
//
mixinsAfter.push({
id: 'set-autoplay',
fn: function set_autoplay_after_mixin(env, callback) {
debug('set-autoplay');
env.result.snippets.forEach(snippet => {
if (snippet.type !== 'text/html' || snippet.tags.indexOf('player') === -1) {
return; // continue
}
snippet.media.autoplay = 'autoplay=1';
});
debug('set-autoplay: done');
callback();
}
});
// Convert 'width', 'height' and 'duration' to float and remove bad values
//
mixinsAfter.push({
id: 'convert-str-int',
fn: function convert_str_int_after_mixin(env, callback) {
debug('convert-str-int');
let fields = [ 'width', 'height', 'duration' ];
env.result.snippets.forEach(snippet => {
fields.forEach(field => {
if (snippet.media[field]) {
snippet.media[field] = parseFloat(snippet.media[field]);
if (!isFinite(snippet.media[field]) || snippet.media[field] < 0) {
delete snippet.media[field];
}
}
// Delete `width` if `height` doesn't exists and vise versa
if (!snippet.media.width || !snippet.media.height) {
if (snippet.media.width) delete snippet.media.width;
if (snippet.media.height) delete snippet.media.height;
}
});
});
debug('convert-str-int: done');
callback();
}
});
module.exports = mixinsAfter;