initial version

.gitignore

@@ -1 +1,2 @@
 /target
+.env

Cargo.toml

@@ -3,6 +3,13 @@ name = "docker-hub-rss"
 version = "0.1.0"
 edition = "2018"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
+tokio = { version = "1", features = ["macros", "rt-multi-thread", "signal"] }
+serde = { version = "1", features = ["derive"] }
+reqwest = { version = "0.11", default-features = false, features = ["rustls-tls", "json"] }
+warp = "0.3"
+serde_json = "1"
+color-eyre = "0.5"
+dotenv = "0.15"
+rss = { version = "1", features = ["builders"] }
+chrono = { version = "0.4", features = ["serde"] }

src/hub.rs

@@ -0,0 +1,49 @@
+use chrono::{DateTime, Utc};
+use color_eyre::eyre::WrapErr;
+use color_eyre::{eyre::ensure, Result};
+use reqwest::Client;
+use serde::Deserialize;
+
+#[derive(Default, Clone)]
+pub struct Hub {
+    client: Client,
+}
+
+impl Hub {
+    pub async fn tags(&self, user: &str, repo: &str) -> Result<Vec<HubTag>> {
+        let result = self
+            .client
+            .get(format!(
+                "https://hub.docker.com/v2/repositories/{}/{}/tags",
+                user, repo
+            ))
+            .send()
+            .await
+            .wrap_err("error with sending docker hub request")?;
+        ensure!(
+            !result.status().is_client_error(),
+            "error with sending docker hub request"
+        );
+        ensure!(
+            !result.status().is_server_error(),
+            "docker hub request returned an error"
+        );
+        Ok(result
+            .json::<HubTagResponse>()
+            .await
+            .wrap_err("failed to parse hub response")?
+            .results)
+    }
+}
+
+#[derive(Debug, Deserialize)]
+pub struct HubTagResponse {
+    results: Vec<HubTag>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct HubTag {
+    pub id: u64,
+    pub last_updated: DateTime<Utc>,
+    pub name: String,
+}

src/main.rs

@@ -1,3 +1,80 @@
-fn main() {
-    println!("Hello, world!");
+mod hub;
+use crate::hub::Hub;
+use color_eyre::{Report, Result};
+use rss::{Channel, ChannelBuilder, GuidBuilder, ItemBuilder};
+use warp::reject::Reject;
+use warp::{Filter, Rejection};
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let port: u16 = dotenv::var("PORT")
+        .map(|port| port.parse())
+        .unwrap_or(Ok(80))?;
+
+    let hub = Hub::default();
+    let hub = warp::any().map(move || hub.clone());
+
+    let feed_route = warp::path!(String / String).and(hub).and_then(feed);
+    let routes = feed_route.clone().or(warp::path!("r" / ..).and(feed_route));
+
+    warp::serve(routes).run(([0, 0, 0, 0], port)).await;
+
+    Ok(())
+}
+
+#[derive(Debug)]
+struct ReportRejection(Report);
+
+impl From<Report> for ReportRejection {
+    fn from(report: Report) -> Self {
+        Self(report)
+    }
+}
+
+impl Reject for ReportRejection {}
+
+async fn feed(user: String, repo: String, hub: Hub) -> Result<impl warp::Reply, Rejection> {
+    feed_inner(user, repo, hub)
+        .await
+        .map_err(warp::reject::custom)
+}
+
+async fn feed_inner(
+    user: String,
+    repo: String,
+    hub: Hub,
+) -> Result<impl warp::Reply, ReportRejection> {
+    let repo = repo.trim_end_matches(".atom").to_string();
+    let mut channel: Channel = ChannelBuilder::default()
+        .title(format!("{}/{} | Docker Hub Images", user, repo))
+        .link(format!("https://hub.docker.com/r/{}/{}", user, repo))
+        .description(format!("Image updates for {}/{}", user, repo))
+        .build()
+        .unwrap();
+
+    let tags = hub.tags(&user, &repo).await?;
+
+    channel.items = tags
+        .into_iter()
+        .map(|tag| {
+            ItemBuilder::default()
+                .title(format!("{}/{}:{}", user, repo, tag.name))
+                .link(format!(
+                    "https://hub.docker.com/r/{}/{}/tags?name={}",
+                    user, repo, tag.name
+                ))
+                .guid(
+                    GuidBuilder::default()
+                        .value(format!("{}-{}", tag.id, tag.last_updated.timestamp()))
+                        .permalink(false)
+                        .build()
+                        .unwrap(),
+                )
+                .pub_date(tag.last_updated.to_rfc2822())
+                .build()
+                .unwrap()
+        })
+        .collect();
+
+    Ok(channel.to_string())
 }