feat: add site-wide social preview image settings (#1463)
- Add configuration field `social_preview_image` that sets the site-wide default social preview image. For pages that do not have `page.image` set in font matter, the seo tag will use the image specified by `site.social_preview_image` as the Open Graph image. - Refactored the generation of image URLs to reduce redundant code and enhance fault tolerance for missing or repeated slash `/` when defining image paths.
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Cotes Chung
GitHub
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@ -75,6 +75,10 @@ img_cdn: "https://chirpy-img.netlify.app"
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# the avatar on sidebar, support local or CORS resources
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avatar: "/commons/avatar.jpg"
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# The URL of the site-wide social preview image used in SEO `og:image` meta tag.
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# It can be overridden by a customized `page.image` in front matter.
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social_preview_image: # string, local or CORS resources
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# boolean type, the global switch for TOC in posts.
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toc: true
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@ -1,5 +1,3 @@
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<!-- The Head -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<meta name="theme-color" media="(prefers-color-scheme: light)" content="#f7f7f7">
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@ -11,29 +9,38 @@
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content="width=device-width, user-scalable=no initial-scale=1, shrink-to-fit=no, viewport-fit=cover"
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>
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{% capture seo_tags %}
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{%- capture seo_tags -%}
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{% seo title=false %}
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{% endcapture %}
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{%- endcapture -%}
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<!-- Setup Open Graph image -->
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{% if page.image %}
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{% assign img = page.image.path | default: page.image %}
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{% assign src = page.image.path | default: page.image %}
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{% unless img contains '://' %}
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{% assign img_path = page.img_path | append: '/' | append: img | replace: '//', '/' %}
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{% capture target %}"{{ img | absolute_url }}"{% endcapture %}
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{% unless src contains '://' %}
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{%- capture img_url -%}
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{% include img-url.html src=src img_path=page.img_path %}
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{%- endcapture -%}
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{% if site.img_cdn contains '//' %}
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<!-- it's a cross-origin URL -->
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{% capture replacement %}"{{ site.img_cdn }}{{ img_path }}"{% endcapture %}
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{% else %}
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<!-- it's a local file path -->
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{%- capture replacement -%}
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"{{ site.img_cdn | append: '/' | append: img_path | replace: '//', '/' | absolute_url }}"
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{%- endcapture -%}
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{% endif %}
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{%- capture old_url -%}{{ src | absolute_url }}{%- endcapture -%}
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{%- capture new_url -%}{{ img_url }}{%- endcapture -%}
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{% assign seo_tags = seo_tags | replace: target, replacement %}
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{% assign seo_tags = seo_tags | replace: old, new %}
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{% endunless %}
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{% elsif site.social_preview_image %}
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{%- capture img_url -%}
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{% include img-url.html src=site.social_preview_image %}
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{%- endcapture -%}
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{%- capture og_image -%}
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<meta property="og:image" content="{{ img_url }}" />
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{%- endcapture -%}
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{% assign old_meta_clip = '<meta name="twitter:card"' %}
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{% assign new_meta_clip = og_image | append: old_meta_clip %}
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{% assign seo_tags = seo_tags | replace: old_meta_clip, new_meta_clip %}
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{% endif %}
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{{ seo_tags }}
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@ -0,0 +1,24 @@
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{%- comment -%}
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Generate image final URL based on `site.img_cdn`, `page.img_path`
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Arguments:
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src - basic image path, required
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img_path - relative path of image, optional
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Return:
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image URL
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{%- endcomment -%}
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{% assign url = include.src %}
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{%- if url -%}
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{%- comment -%} CND URL {%- endcomment -%}
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{% assign prefix = site.img_cdn | default: '' | relative_url %}
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{%- comment -%} Add page image path prefix {%- endcomment -%}
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{% assign url = include.img_path | default: '' | append: '/' | append: url %}
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{% assign url = prefix | append: '/' | append: url | replace: '///', '/' | replace: '//', '/' | replace: ':', ':/' %}
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{%- endif -%}
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{{- url -}}
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@ -48,23 +48,6 @@
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{% assign _img_content = null %}
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{% assign _img_snippets = _content | split: IMG_TAG %}
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<!-- CDN URL -->
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{% if site.img_cdn %}
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{% if site.img_cdn contains '//' %}
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{% assign _path_prefix = site.img_cdn %}
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{% else %}
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{% assign _path_prefix = site.img_cdn | relative_url %}
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{% endif %}
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{% else %}
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{% assign _path_prefix = site.baseurl %}
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{% endif %}
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<!-- Add image path -->
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{% if page.img_path %}
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{% assign _path = page.img_path | append: '/' | replace: '//', '/' %}
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{% assign _path_prefix = _path_prefix | append: _path %}
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{% endif %}
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{% for _img_snippet in _img_snippets %}
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{% if forloop.first %}
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{% assign _img_content = _img_snippet %}
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@ -113,6 +96,12 @@
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{% assign _final_src = null %}
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{% assign _lazyload = true %}
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{%- capture _img_url -%}
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{% include img-url.html src=_src img_path=page.img_path %}
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{%- endcapture -%}
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{% assign _path_prefix = _img_url | remove: _src %}
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{% unless _src contains '//' %}
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{% assign _final_src = _path_prefix | append: _src %}
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{% assign _src_alt = 'src="' | append: _path_prefix %}
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@ -3,18 +3,12 @@
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<aside aria-label="Sidebar" id="sidebar" class="d-flex flex-column align-items-end">
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<header class="profile-wrapper">
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<a href="{{ '/' | relative_url }}" id="avatar" class="rounded-circle">
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{% if site.avatar != empty and site.avatar %}
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{% capture avatar_url %}
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{% if site.avatar contains '://' %}
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{{ site.avatar }}
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{% elsif site.img_cdn != empty and site.img_cdn %}
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{{ site.avatar | prepend: site.img_cdn }}
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{% else %}
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{{ site.avatar | relative_url }}
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{% endif %}
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{% endcapture %}
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<img src="{{ avatar_url | strip }}" width="112" height="112" alt="avatar" onerror="this.style.display='none'">
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{% endif %}
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{%- if site.avatar != empty and site.avatar -%}
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{%- capture avatar_url -%}
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{% include img-url.html src=site.avatar %}
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{%- endcapture -%}
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<img src="{{- avatar_url -}}" width="112" height="112" alt="avatar" onerror="this.style.display='none'">
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{%- endif -%}
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</a>
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<h1 class="site-title">
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