From fba44ba09d96accbff81185c97b8426919fa95d6 Mon Sep 17 00:00:00 2001
From: Folyd <lyshuhow@gmail.com>
Date: Fri, 27 Jan 2023 11:32:24 +0800
Subject: [PATCH] Support specify canonical url for articles (#149)

---
 src/entity/article.rs | 4 ++++
 templates/_meta.jinja | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/src/entity/article.rs b/src/entity/article.rs
index 82d7a8c..9495887 100644
--- a/src/entity/article.rs
+++ b/src/entity/article.rs
@@ -57,6 +57,9 @@ pub struct Article {
     /// generate HTML file in this mode.
     #[serde(default)]
     pub publish: bool,
+    /// The canonical link of this article.
+    /// See issue: https://github.com/zineland/zine/issues/141
+    pub canonical: Option<String>,
     #[serde(default, skip_serializing)]
     pub i18n: HashMap<String, Article>,
 }
@@ -191,6 +194,7 @@ impl Article {
         );
         context.insert("page_type", "article");
         context.insert("article", &self);
+        context.insert("canonical_url", &self.canonical);
 
         let zine_data = data::read();
         let markdown_config = zine_data.get_markdown_config();
diff --git a/templates/_meta.jinja b/templates/_meta.jinja
index b0e9b9d..a46b217 100644
--- a/templates/_meta.jinja
+++ b/templates/_meta.jinja
@@ -31,4 +31,11 @@
 <meta name="twitter:card" content="summary_large_image">
 <meta property="og:image" content="{{ image_url ~ image }}">
 <meta name="twitter:image" content="{{ image_url ~ image }}">
+{% endif -%}
+{% if page_type and page_type == "article" -%}
+{% if canonical_url -%}
+<link rel="canonical" href="{{ canonical_url }}">
+{% else -%}
+<link rel="canonical" href="{{ site.url ~ '/' ~ meta.url }}">
+{% endif -%}
 {% endif -%}
\ No newline at end of file