1 files changed, 142 insertions, 0 deletions
diff --git a/src/atom.rs b/src/atom.rs
new file mode 100644
index 0000000..4410edb
--- /dev/null
+++ b/src/atom.rs
@@ -0,0 +1,142 @@
+use atom_syndication::{
+    Category, Content as AtomContent, Entry as AtomEntry, Feed, Generator, Link, Person, Text,
+    TextType,
+};
+use chrono::{DateTime, Utc};
+
+use crate::posts::Post;
+
+pub struct Context {
+    /// the page for which the feed is being generated for
+    pub page_title: String,
+    /// the human-readable page the feed is for
+    pub page_url: String,
+    /// the url to the atom xml document
+    pub self_url: String,
+    /// current site language
+    pub lang: String,
+}
+
+pub async fn atom<P: Post + Clone>(ctx: Context, entries: Vec<P>) -> Feed {
+    let mut authors = Vec::new();
+    let me = Person {
+        name: "cel".to_owned(),
+        email: Some("cel@blos.sm".to_owned()),
+        uri: Some("/contact".to_owned()),
+    };
+    authors.push(me.clone());
+    let page_link = Link {
+        href: ctx.page_url.clone(),
+        rel: "alternate".into(),
+        hreflang: Some(ctx.lang.clone()),
+        mime_type: Some("text/html".into()),
+        title: Some(ctx.page_title.clone()),
+        length: None,
+    };
+    let home_link = Link {
+        // TODO?: localisation
+        href: "/".into(),
+        rel: "via".into(),
+        hreflang: Some(ctx.lang.clone()),
+        mime_type: Some("text/html".into()),
+        // TODO: localisation
+        title: Some("cel's garden".into()),
+        length: None,
+    };
+    let self_link = Link {
+        href: ctx.self_url.into(),
+        rel: "self".into(),
+        hreflang: Some(ctx.lang.clone()),
+        mime_type: Some("application/atom+xml".into()),
+        // TODO: localisation
+        title: Some("atom feed".into()),
+        length: None,
+    };
+    let mut links = Vec::new();
+    links.push(page_link);
+    links.push(home_link);
+    links.push(self_link);
+    let mut feed = Feed {
+        title: Text {
+            value: ctx.page_title,
+            base: None,
+            lang: Some(ctx.lang.clone()),
+            r#type: TextType::Text,
+        },
+        id: ctx.page_url,
+        updated: entries
+            .clone()
+            .into_iter()
+            .fold(DateTime::<Utc>::MIN_UTC, |acc, entry| {
+                let updated_at = entry.updated_at().to_owned();
+                if updated_at > acc {
+                    updated_at
+                } else {
+                    acc
+                }
+            })
+            .into(),
+        authors: authors.clone(),
+        categories: Vec::new(),
+        contributors: authors.clone(),
+        generator: Some(Generator {
+            value: "blossom".into(),
+            uri: Some("https://bunny.garden/cel/blossom".into()),
+            version: None,
+        }),
+        icon: Some("/favicon.ico".into()),
+        links: links.clone(),
+        logo: Some("/logo.png".into()),
+        entries: Vec::new(),
+        // TODO: determine base url from lang
+        base: Some("https://en.blos.sm/".into()),
+        lang: Some(ctx.lang),
+        ..Default::default()
+    };
+    for entry in entries {
+        // TODO: localisation: url from lang + filtering entries translated or not
+        let categories = entry
+            .tags()
+            .into_iter()
+            .map(|category| Category {
+                term: category.clone(),
+                scheme: None,
+                label: Some(category.clone()),
+            })
+            .collect();
+        let published = Some(entry.published_at().to_owned().into());
+        let title = if let Some(title) = entry.subject() {
+            title.to_owned()
+        } else {
+            entry.content()[..30].to_owned() + "..."
+        };
+        let entry = AtomEntry {
+            title: Text {
+                value: title,
+                base: None,
+                lang: Some(entry.lang().to_owned()),
+                r#type: TextType::Text,
+            },
+            id: entry.link(),
+            updated: entry.updated_at().to_owned().into(),
+            authors: authors.clone(),
+            categories,
+            contributors: authors.clone(),
+            links: links.clone(),
+            published,
+            rights: None,
+            source: None,
+            summary: None,
+            content: Some(AtomContent {
+                base: None,
+                lang: Some(entry.lang().to_owned()),
+                value: Some(entry.content().to_owned()),
+                src: Some(entry.link()),
+                content_type: Some("html".to_string()),
+            }),
+            ..Default::default()
+        };
+        feed.entries.push(entry);
+    }
+    feed
+}