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84 lines
3.4 KiB
JavaScript
84 lines
3.4 KiB
JavaScript
const _ = require('lodash');
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const hbs = require('./engine');
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const urlService = require('../url');
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const config = require('../../config');
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const common = require('../../lib/common');
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const settingsCache = require('../settings/cache');
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const activeTheme = require('./active');
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// ### Ensure Active Theme
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// Ensure there's a properly set & mounted active theme before attempting to serve a blog request
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// If there is no active theme, throw an error
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// Else, ensure the active theme is mounted
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function ensureActiveTheme(req, res, next) {
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// CASE: this means that the theme hasn't been loaded yet i.e. there is no active theme
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if (!activeTheme.get()) {
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// This is the one place we ACTUALLY throw an error for a missing theme as it's a request we cannot serve
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return next(new common.errors.InternalServerError({
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// We use the settingsCache here, because the setting will be set,
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// even if the theme itself is not usable because it is invalid or missing.
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message: common.i18n.t('errors.middleware.themehandler.missingTheme', {theme: settingsCache.get('active_theme')})
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}));
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}
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// CASE: bootstrap theme validation failed, we would like to show the errors on the blog [only production]
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if (activeTheme.get().error && config.get('env') === 'production') {
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return next(new common.errors.InternalServerError({
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// We use the settingsCache here, because the setting will be set,
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// even if the theme itself is not usable because it is invalid or missing.
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message: common.i18n.t('errors.middleware.themehandler.invalidTheme', {theme: settingsCache.get('active_theme')}),
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errorDetails: activeTheme.get().error.errorDetails
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}));
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}
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// If the active theme has not yet been mounted, mount it into express
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if (!activeTheme.get().mounted) {
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activeTheme.get().mount(req.app);
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}
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next();
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}
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// ### Update Template Data
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// Updates handlebars with the contextual data for the current request
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function updateTemplateData(req, res, next) {
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// Static information, same for every request unless the settings change
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// @TODO: bind this once and then update based on events?
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// @TODO: decouple theme layer from settings cache using the Content API
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const siteData = settingsCache.getPublic();
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const labsData = _.cloneDeep(settingsCache.get('labs'));
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const themeData = {};
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if (activeTheme.get()) {
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themeData.posts_per_page = activeTheme.get().config('posts_per_page');
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themeData.image_sizes = activeTheme.get().config('image_sizes');
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}
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// Request-specific information
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// These things are super dependent on the request, so they need to be in middleware
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// Serve the blog url without trailing slash
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siteData.url = urlService.utils.urlFor('home', {secure: req.secure, trailingSlash: false}, true);
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// Pass 'secure' flag to the view engine
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// so that templates can choose to render https or http 'url', see url utility
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res.locals.secure = req.secure;
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// @TODO: only do this if something changed?
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// @TODO: remove blog if we drop v0.1 (Ghost 3.0)
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hbs.updateTemplateOptions({
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data: {
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blog: siteData,
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site: siteData,
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labs: labsData,
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config: themeData
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}
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});
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next();
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}
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module.exports = [
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ensureActiveTheme,
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updateTemplateData
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];
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