Ghost/core/frontend/meta/context_object.js

var settingsCache = require('../../server/services/settings/cache'),
    _ = require('lodash');

function getContextObject(data, context) {
    /**
     * If the data object does not contain the requested context, we return the fallback object.
     */
    const blog = {
        cover_image: settingsCache.get('cover_image'),
        twitter: settingsCache.get('twitter'),
        facebook: settingsCache.get('facebook')
    };

    let chosenContext;

    // @TODO: meta layer is very broken, it's really hard to understand what it's doing
    // The problem is that handlebars root object is structured differently. Sometimes the object is flat on data
    // and sometimes the object is part of a key e.g. data.post. This needs to be prepared at the very first stage and not in each helper.
    if ((_.includes(context, 'page') || _.includes(context, 'amp')) && data.post) {
        chosenContext = data.post;
    } else if (_.includes(context, 'post') && data.post) {
        chosenContext = data.post;
    } else if (_.includes(context, 'page') && data.page) {
        chosenContext = data.page;
    } else if (data[context]) {
        // @NOTE: This is confusing as hell. It tries to get data[['author']], which works, but coincidence?
        chosenContext = data[context];
    }

    // Super fallback.
    if (!chosenContext) {
        chosenContext = blog;
    }

    return chosenContext;
}

module.exports = getContextObject;