Atom feed, GUID for RSS feed

Cargo.lock

@@ -485,9 +485,9 @@ dependencies = [
 
 [[package]]
 name = "http-body"
-version = "0.4.4"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ff4f84919677303da5f147645dbea6b1881f368d03ac84e1dc09031ebd7b2c6"
+checksum = "d5f38f16d184e36f2408a55281cd658ecbd3ca05cce6d6510a176eca393e26d1"
 dependencies = [
  "bytes",
  "http",
@@ -650,7 +650,7 @@ checksum = "349d5a591cd28b49e1d1037471617a32ddcda5731b99419008085f72d5a53836"
 [[package]]
 name = "libshire"
 version = "0.1.0"
-source = "git+https://github.com/pantonshire/libshire#62dae931409c14531cf338d73269e415c638dede"
+source = "git+https://github.com/pantonshire/libshire#bd2b3a8a29b34ffeecd658b74ef81a1431fc91f0"
 
 [[package]]
 name = "line-wrap"
@@ -920,9 +920,9 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.10.0"
+version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87f3e037eac156d1775da914196f0f37741a274155e34a0b7e427c35d2a2ecb9"
+checksum = "7709cef83f0c1f58f666e746a08b21e0085f7440fa6a29cc194d68aac97a4225"
 
 [[package]]
 name = "onig"
@@ -1108,9 +1108,9 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.5.5"
+version = "1.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a11647b6b25ff05a515cb92c365cec08801e83423a235b51e231e1808747286"
+checksum = "d83f127d94bdbcda4c8cc2e50f6f84f4b611f69c902699ca385a39c3a75f9ff1"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -1119,9 +1119,9 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.25"
+version = "0.6.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
+checksum = "49b3de9ec5dc0a3417da371aab17d729997c15010e7fd24ff707773a33bddb64"
 
 [[package]]
 name = "rss"

blog_server/src/main.rs

@@ -5,8 +5,10 @@ mod posts_store;
 mod render;
 mod service;
 mod template;
+mod time;
+mod uuid;
 
-use std::{env, fs, path::PathBuf, thread};
+use std::{env, fs, path::PathBuf, sync::Arc, thread};
 
 use axum::Server;
 use miette::{IntoDiagnostic, Context};
@@ -26,8 +28,22 @@ pub struct Config {
     posts_dir: PathBuf,
     #[knuffel(child, unwrap(argument))]
     static_dir: PathBuf,
+    #[knuffel(child, unwrap(argument))]
+    namespace_uuid: uuid::Uuid,
+    #[knuffel(child)]
+    self_ref: SelfRefConfig,
     #[knuffel(child)]
     rss: RssConfig,
+    #[knuffel(child)]
+    atom: AtomConfig,
+}
+
+#[derive(knuffel::Decode, Clone, Debug)]
+pub struct SelfRefConfig {
+    #[knuffel(child, unwrap(argument))]
+    protocol: String,
+    #[knuffel(child, unwrap(argument))]
+    domain: String,
 }
 
 #[derive(knuffel::Decode, Clone, Debug)]
@@ -38,10 +54,14 @@ pub struct RssConfig {
     title: String,
     #[knuffel(child, unwrap(argument))]
     ttl: u32,
+}
+
+#[derive(knuffel::Decode, Clone, Debug)]
+pub struct AtomConfig {
     #[knuffel(child, unwrap(argument))]
-    protocol: String,
+    num_posts: usize,
     #[knuffel(child, unwrap(argument))]
-    domain: String,
+    title: String,
 }
 
 fn main() -> miette::Result<()> {
@@ -49,7 +69,7 @@ fn main() -> miette::Result<()> {
 
     // Load the configuration from the KDL config file specified by the first command-line
     // argument.
-    let config = {
+    let config = Arc::new({
         let config_path = env::args().nth(1)
             .ok_or_else(|| miette::Error::msg("No config file specified"))?;
 
@@ -61,7 +81,7 @@ fn main() -> miette::Result<()> {
             
         knuffel::parse::<Config>(&config_path, &contents)
             .wrap_err_with(|| format!("Failed to parse config file {}", config_path))?
-    };
+    });
 
     // Create the data structure used to store the rendered posts. This uses an `Arc` internally,
     // so clones will point to the same underlying data.
@@ -71,6 +91,7 @@ fn main() -> miette::Result<()> {
 
     // Create the post renderer and the mpsc channel that will be used to communicate with it.
     let (renderer, tx) = Renderer::new(
+        config.clone(),
         posts_store.clone(),
         code_renderer,
         config.posts_dir.clone()
@@ -96,7 +117,7 @@ fn main() -> miette::Result<()> {
 }
 
 async fn run(
-    config: Config,
+    config: Arc<Config>,
     posts_store: ConcurrentPostsStore,
 ) -> miette::Result<()>
 {

blog_server/src/post.rs

@@ -1,7 +1,7 @@
 use std::{borrow, error, fmt, ops};
 
 use chrono::{DateTime, Utc};
-use libshire::strings::ShString22;
+use libshire::{strings::ShString22, uuid::{Uuid, UuidV5Error}};
 use maud::{Markup, PreEscaped};
 
 use crate::codeblock::CodeBlockRenderer;
@@ -73,6 +73,7 @@ impl fmt::Display for PostId {
 }
 
 pub struct Post {
+    uuid: Uuid,
     id: PostId,
     title: String,
     author: String,
@@ -83,8 +84,8 @@ pub struct Post {
 }
 
 impl Post {
-    pub fn id_str(&self) -> &str {
-        &self.id
+    pub fn uuid(&self) -> Uuid {
+        self.uuid
     }
 
     pub fn id(&self) -> &PostId {
@@ -117,6 +118,7 @@ impl Post {
     
     pub fn parse(
         code_renderer: &CodeBlockRenderer,
+        namespace: Uuid,
         post_id: PostId,
         file_name: &str,
         created: DateTime<Utc>,
@@ -124,17 +126,25 @@ impl Post {
         source: &str,
     ) -> Result<Self, ParseError>
     {
-        let mdpost = MdPost::parse(file_name, source)?;
-        Ok(Self::from_mdpost(code_renderer, post_id, created, updated, mdpost))
+        MdPost::parse(file_name, source)
+            .and_then(|post| Self::from_mdpost(
+                code_renderer,
+                namespace,
+                post_id,
+                created,
+                updated,
+                post
+            ))
     }
 
     fn from_mdpost(
         code_renderer: &CodeBlockRenderer,
+        namespace: Uuid,
         id: PostId,
         created: DateTime<Utc>,
         updated: DateTime<Utc>,
         mdpost: MdPost,
-    ) -> Self
+    ) -> Result<Self, ParseError>
     {
         use pulldown_cmark::{Options, Parser, html::push_html};
         
@@ -142,6 +152,11 @@ impl Post {
             .union(Options::ENABLE_FOOTNOTES)
             .union(Options::ENABLE_STRIKETHROUGH);
 
+        let uuid = Uuid::new_v5(namespace, &*id)
+            .map_err(|err| match err {
+                UuidV5Error::NameTooLong(len) => ParseError::IdTooLong(len),
+            })?;
+
         let mut parser = PostMdParser::new(
             Parser::new_ext(&mdpost.markdown, PARSER_OPTIONS),
             code_renderer
@@ -150,7 +165,8 @@ impl Post {
         let mut html_buf = String::new();
         push_html(&mut html_buf, parser.by_ref());
         
-        Self {
+        Ok(Self {
+            uuid,
             id,
             title: mdpost.title,
             author: mdpost.author,
@@ -158,7 +174,7 @@ impl Post {
             tags: mdpost.tags,
             created,
             updated,
-        }
+        })
     }
 }
 
@@ -281,13 +297,15 @@ impl MdPost {
 pub enum ParseError {
     MissingHeader,
     InvalidHeader(Box<knuffel::Error>),
+    IdTooLong(usize),
 }
 
 impl fmt::Display for ParseError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
-            ParseError::MissingHeader => write!(f, "Post file has no header"),
-            ParseError::InvalidHeader(err) => fmt::Display::fmt(err, f),
+            Self::MissingHeader => write!(f, "post file has no header"),
+            Self::InvalidHeader(err) => fmt::Display::fmt(err, f),
+            Self::IdTooLong(len) => write!(f, "post id too long ({} bytes)", len),
         }
     }
 }

blog_server/src/posts_store.rs

@@ -29,7 +29,7 @@ impl ConcurrentPostsStore {
     }
 
     pub async fn get(&self, id: &str) -> Option<Arc<Post>> {
-        self.read().await.get(id)
+        self.read().await.get(id).cloned()
     }
 }
 
@@ -56,12 +56,12 @@ impl PostsStore {
         }
     }
 
-    pub fn get(&self, id: &str) -> Option<Arc<Post>> {
-        self.posts.get(id).cloned()
+    pub fn get(&self, id: &str) -> Option<&Arc<Post>> {
+        self.posts.get(id)
     }
 
     pub fn insert(&mut self, post: Post) -> Option<Arc<Post>> {
-        let old_post = self.remove(post.id_str());
+        let old_post = self.remove(post.id());
 
         // Insert the post into each of the tag indexes.
         for tag in post.tags() {
@@ -109,19 +109,23 @@ impl PostsStore {
         self.posts.clear();
     }
 
+    pub fn last_updated(&self) -> Option<DateTime<Utc>> {
+        self.iter().map(|post| post.updated()).max()
+    }
+
     pub fn iter(&self)
     -> impl '_
-        + Iterator<Item = Arc<Post>>
+        + Iterator<Item = &Arc<Post>>
         + ExactSizeIterator
         + FusedIterator
         + Clone
     {
-        self.posts.values().cloned()
+        self.posts.values()
     }
 
     pub fn iter_by_created(&self)
     -> impl '_
-        + Iterator<Item = Arc<Post>>
+        + Iterator<Item = &Arc<Post>>
         + DoubleEndedIterator
         + ExactSizeIterator
         + FusedIterator

blog_server/src/render.rs

@@ -3,20 +3,23 @@ use std::{
     fs,
     io::{self, Read},
     path::PathBuf,
-    sync::mpsc,
+    sync::{Arc, mpsc},
 };
 
-use chrono::{DateTime, Utc};
+use chrono::DateTime;
 use notify::DebouncedEvent;
 use tracing::{info, warn, error};
 
 use crate::{
     codeblock::CodeBlockRenderer,
+    Config,
     post::{ParseError, Post, PostId},
     posts_store::ConcurrentPostsStore,
+    time::unix_epoch,
 };
 
 pub struct Renderer {
+    config: Arc<Config>,
     posts: ConcurrentPostsStore,
     code_renderer: CodeBlockRenderer,
     posts_dir_path: PathBuf,
@@ -25,6 +28,7 @@ pub struct Renderer {
 
 impl Renderer {
     pub fn new(
+        config: Arc<Config>,
         posts: ConcurrentPostsStore,
         code_renderer: CodeBlockRenderer,
         posts_dir_path: PathBuf,
@@ -38,6 +42,7 @@ impl Renderer {
         tx.send(DebouncedEvent::Rescan).unwrap();
 
         (Self {
+            config,
             posts,
             code_renderer,
             posts_dir_path,
@@ -185,10 +190,11 @@ impl Renderer {
     
         let (created, updated) = metadata.created()
             .and_then(|created| metadata.modified()
-                .map(|modified| (DateTime::<Utc>::from(created), DateTime::<Utc>::from(modified))))
+                .map(|modified| (DateTime::from(created), DateTime::from(modified))))
+            // If created / modified metadata is not available, default to the UNIX epoch.
             .unwrap_or_else(|_| {
-                let now = Utc::now();
-                (now, now)
+                let epoch = unix_epoch();
+                (epoch, epoch)
             });
     
         let contents = {
@@ -202,6 +208,7 @@ impl Renderer {
     
         Post::parse(
             &self.code_renderer,
+            *self.config.namespace_uuid,
             target.id.clone(),
             &target.path.to_string_lossy(),
             created,

blog_server/src/service/atom.rs

@@ -0,0 +1,82 @@
+use std::sync::Arc;
+
+use atom_syndication as atom;
+use axum::{
+    body::Bytes,
+    extract::Extension,
+};
+
+use super::response::Atom;
+use crate::{
+    Config,
+    posts_store::ConcurrentPostsStore,
+    time::unix_epoch,
+};
+
+pub async fn handle(
+    Extension(config): Extension<Arc<Config>>,
+    Extension(posts): Extension<ConcurrentPostsStore>,
+) -> Atom<Bytes> {
+    let (atom_entries, updated) = {
+        let guard = posts.read().await;
+
+        let atom_entries = guard.iter_by_created()
+            .take(config.atom.num_posts)
+            .map(|post| {
+                atom::EntryBuilder::default()
+                    .id(format!("urn:uuid:{}", post.uuid()))
+                    .title(post.title().to_owned())
+                    .updated(post.updated())
+                    .links(vec![
+                        atom::LinkBuilder::default()
+                            .href(format!(
+                                "{}://{}/articles/{}",
+                                config.self_ref.protocol,
+                                config.self_ref.domain,
+                                post.id()
+                            ))
+                            .rel("alternate".to_owned())
+                            .mime_type(Some("text/html".to_owned()))
+                            .build()
+                    ])
+                    .author(atom::PersonBuilder::default()
+                        .name(post.author().to_owned())
+                        .build())
+                    .build()
+            })
+            .collect::<Vec<atom::Entry>>();
+
+        let updated = guard.last_updated()
+            .unwrap_or_else(unix_epoch);
+
+        (atom_entries, updated)
+    };
+
+    Atom(atom::FeedBuilder::default()
+        .id(format!("urn:uuid:{}", *config.namespace_uuid))
+        .title(config.atom.title.clone())
+        .updated(updated)
+        .links(vec![
+            atom::LinkBuilder::default()
+                .href(format!(
+                    "{}://{}/atom.xml",
+                    config.self_ref.protocol,
+                    config.self_ref.domain
+                ))
+                .rel("self".to_owned())
+                .build(),
+            atom::LinkBuilder::default()
+                .href(format!(
+                    "{}://{}/articles/",
+                    config.self_ref.protocol,
+                    config.self_ref.domain
+                ))
+                .rel("alternate".to_owned())
+                .mime_type(Some("text/html".to_owned()))
+                .build()
+        ])
+        .entries(atom_entries)
+        .build()
+        .to_string()
+        .into())
+}

blog_server/src/service/index.rs

@@ -43,7 +43,7 @@ pub async fn handle(Extension(posts): Extension<ConcurrentPostsStore>) -> Html {
                 ul {
                     @for post in posts.read().await.iter_by_created().rev().take(5) {
                         li {
-                            a href={"/articles/" (post.id_str())} { (post.title()) }
+                            a href={"/articles/" (post.id())} { (post.title()) }
                         }
                     }
                 }

blog_server/src/service/mod.rs

@@ -1,3 +1,4 @@
+mod atom;
 mod contact;
 mod index;
 mod post;

blog_server/src/service/posts_list.rs

@@ -23,7 +23,7 @@ pub async fn handle(Extension(posts): Extension<ConcurrentPostsStore>) -> Html {
                 ul {
                     @for post in posts.read().await.iter_by_created().rev() {
                         li {
-                            a href={"/articles/" (post.id_str())} { (post.title()) }
+                            a href={"/articles/" (post.id())} { (post.title()) }
                             span class="quiet" {
                                 " — " (post.created().format("%Y/%m/%d"))
                             }

blog_server/src/service/rss.rs

@@ -6,37 +6,53 @@ use axum::{
 };
 
 use super::response::Rss;
-use crate::{posts_store::ConcurrentPostsStore, Config};
+use crate::{
+    Config,
+    posts_store::ConcurrentPostsStore,
+    time::unix_epoch,
+};
 
 pub async fn handle(
     Extension(config): Extension<Arc<Config>>,
     Extension(posts): Extension<ConcurrentPostsStore>,
 ) -> Rss<Bytes> {
-    let rss_items = posts.read()
-        .await
-        .iter_by_created()
-        .take(config.rss.num_posts)
-        .map(|post| {
-            rss::ItemBuilder::default()
-                .title(Some(post.title().to_owned()))
-                .link(Some(format!(
-                    "{}://{}/articles/{}",
-                    config.rss.protocol,
-                    config.rss.domain,
-                    post.id()
-                )))
-                .pub_date(Some(post.created().to_rfc2822()))
-                .build()
-        })
-        .collect::<Vec<rss::Item>>();
+    let (rss_items, updated) = {
+        let guard = posts.read().await;
+
+        let rss_items = guard.iter_by_created()
+            .take(config.rss.num_posts)
+            .map(|post| {
+                rss::ItemBuilder::default()
+                    .title(Some(post.title().to_owned()))
+                    .guid(Some(rss::GuidBuilder::default()
+                        .value(post.uuid().to_string())
+                        .permalink(false)
+                        .build()))
+                    .link(Some(format!(
+                        "{}://{}/articles/{}",
+                        config.self_ref.protocol,
+                        config.self_ref.domain,
+                        post.id()
+                    )))
+                    .pub_date(Some(post.created().to_rfc2822()))
+                    .build()
+            })
+            .collect::<Vec<rss::Item>>();
+
+        let updated = guard.last_updated()
+            .unwrap_or_else(unix_epoch);
+
+        (rss_items, updated)
+    };
 
     Rss(rss::ChannelBuilder::default()
         .title(config.rss.title.clone())
         .link(format!(
             "{}://{}",
-            config.rss.protocol, config.rss.domain
+            config.self_ref.protocol, config.self_ref.domain
         ))
         .ttl(Some(config.rss.ttl.to_string()))
+        .last_build_date(Some(updated.to_rfc2822()))
         .items(rss_items)
         .build()
         .to_string()

blog_server/src/service/site.rs

@@ -16,6 +16,7 @@ use crate::{
     posts_store::ConcurrentPostsStore
 };
 use super::{
+    atom,
     contact,
     index,
     post,
@@ -26,13 +27,14 @@ use super::{
 };
 
 pub fn service(
-    config: Config,
+    config: Arc<Config>,
     posts_store: ConcurrentPostsStore,
 ) -> Router
 {
     Router::new()
         .route("/", get(index::handle))
         .route("/rss.xml", get(rss::handle))
+        .route("/atom.xml", get(atom::handle))
         .route("/contact", get(contact::handle))
         .route("/articles", get(posts_list::handle))
         .route("/articles/:post_id", get(post::handle))
@@ -40,7 +42,7 @@ pub fn service(
         .fallback(handle_fallback.into_service())
         .layer(ConcurrencyLimitLayer::new(config.concurrency_limit))
         .layer(TraceLayer::new_for_http())
-        .layer(Extension(Arc::new(config)))
+        .layer(Extension(config))
         .layer(Extension(posts_store))
 }
 

blog_server/src/time.rs

@@ -0,0 +1,5 @@
+use chrono::{DateTime, NaiveDateTime, Utc};
+
+pub fn unix_epoch() -> DateTime<Utc> {
+    DateTime::from_utc(NaiveDateTime::from_timestamp(0, 0), Utc)
+}

blog_server/src/uuid.rs

@@ -0,0 +1,60 @@
+use std::ops;
+
+use knuffel::{
+    ast::{Literal, TypeName},
+    decode::{Context, Kind},
+    errors::{DecodeError, ExpectedType},
+    span::Spanned,
+    traits::ErrorSpan,
+    DecodeScalar,
+};
+
+#[derive(Clone, Copy, Default, Debug)]
+#[repr(transparent)]
+pub struct Uuid(pub libshire::uuid::Uuid);
+
+impl Uuid {
+    pub fn as_inner(&self) -> &libshire::uuid::Uuid {
+        &self.0
+    }
+}
+
+impl ops::Deref for Uuid {
+    type Target = libshire::uuid::Uuid;
+
+    fn deref(&self) -> &Self::Target {
+        self.as_inner()
+    }
+}
+
+impl<S: ErrorSpan> DecodeScalar<S> for Uuid {
+    fn type_check(type_name: &Option<Spanned<TypeName, S>>, ctx: &mut Context<S>) {
+        if let Some(type_name) = type_name {
+            ctx.emit_error(DecodeError::TypeName {
+                span: type_name.span().clone(),
+                found: Some((&**type_name).clone()),
+                expected: ExpectedType::no_type(),
+                rust_type: "Uuid",
+            });
+        }
+    }
+
+    fn raw_decode(
+        value: &Spanned<Literal, S>,
+        ctx: &mut Context<S>,
+    ) -> Result<Self, DecodeError<S>> {
+        match &**value {
+            Literal::String(s) => match s.parse() {
+                Ok(uuid) => Ok(Self(uuid)),
+                Err(err) => {
+                    ctx.emit_error(DecodeError::conversion(value, err));
+                    Ok(Default::default())
+                }
+            },
+            _ => {
+                ctx.emit_error(DecodeError::scalar_kind(Kind::String, value));
+                Ok(Default::default())
+            }
+        }
+    }
+}