Twitter Card メタタグ

{%- comment -%}
    You have to change the Twitter handle line 6.
    You have to change the logo asset on line 35. It must be a square picture.
{%- endcomment -%}

<meta name="twitter:site" content="@twitter_handler" />

{% if template contains 'product' %}
    <meta name="twitter:card" content="product" />
    <meta name="twitter:title" content="{{ product.title | escape }}" />
    <meta name="twitter:description" content="{{ product.description | strip_html | strip_newlines | truncatewords: 60, '' | escape }}" />
    <meta name="twitter:image" content="https:{{ product.featured_image.src | product_img_url: 'large' }}" />
    <meta name="twitter:label1" content="Price" />
    <meta name="twitter:data1" content="{% if product.price_varies %}From {% endif %}{{ product.price | money_with_currency | strip_html }}" />
    {% if product.vendor == blank %}
        <meta name="twitter:label2" content="Availability" />
        <meta name="twitter:data2" content="{% if product.available %}In stock{% else %}Out of stock{% endif %}" />
    {% else %}
        <meta name="twitter:label2" content="Brand" />
        <meta name="twitter:data2" content="{{ product.vendor | escape }}" />
    {% endif %}
{% elsif template contains 'article' %}
    <meta name="twitter:card" content="summary" />
    <meta name="twitter:title" content="{{ article.title | escape }}" />
    <meta name="twitter:description" content="{{ article.excerpt_or_content | strip_html | truncatewords: 60, '' | escape }}" />
    {% assign img_tag = '<' | append: 'img' %}
    {% if article.content contains img_tag %}
        {% assign src = article.content | split: 'src="' %}
        {% assign src = src[1] | split: '"' | first | remove: 'https:' | remove: 'http:' %}
        {% if src %}
            <meta property="twitter:image" content="http:{{ src }}" />
        {% endif %}
    {% endif %}
{% else %}
    <meta name="twitter:image" content="{{ 'logo-square.png' | asset_url }}" />
{% endif %}