<!-- OpenGraph -->
<% if (theme.head.opengraph.enable) { %>
    <%
    var ogImageRaw = theme.head.opengraph.image;
    var ogImage = ogImageRaw;
    if (typeof ogImageRaw === 'string') {
        var ogImagePath = ogImageRaw.trim();
        var isJsonLiteral = (ogImagePath.charAt(0) === '[' && ogImagePath.charAt(ogImagePath.length - 1) === ']')
            || (ogImagePath.charAt(0) === '"' && ogImagePath.charAt(ogImagePath.length - 1) === '"');
        var isDotPath = /^[A-Za-z_$][\w$]*(\.[A-Za-z_$][\w$]*)*$/.test(ogImagePath);
        if (isJsonLiteral) {
            try {
                ogImage = JSON.parse(ogImagePath);
            } catch (e) {
                ogImage = ogImagePath;
            }
        } else if (isDotPath) {
            var ogRoots = {
                page: typeof page !== 'undefined' ? page : undefined,
                theme: typeof theme !== 'undefined' ? theme : undefined,
                config: typeof config !== 'undefined' ? config : undefined
            };
            var ogSegments = ogImagePath.split('.');
            ogImage = ogRoots[ogSegments[0]];
            for (var i = 1; i < ogSegments.length && ogImage !== undefined && ogImage !== null; i++) {
                ogImage = ogImage[ogSegments[i]];
            }
        } else {
            ogImage = ogImagePath;
        }
    }
    %>
    <%- open_graph({
        type: theme.head.opengraph.type,
        twitter_card: theme.head.opengraph.twitter_card,
        twitter_id: theme.head.opengraph.twitter_id,
        image: ogImage,
        fb_admins: theme.head.opengraph.fb_admins,
        fb_app_id: theme.head.opengraph.fb_app_id
    }) %>
<% } %>