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Monorepo for Tangled
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5.2 kB · 153 lines
Rust
at sl/comment
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154use std::collections::HashMap;
use serde::Deserialize;use worker::*;
/// The JSON value stored in Workers KV, keyed by domain.////// Example KV entry:/// key: "foo.example.com"/// value: {"did": "did:plc:...", "repos": {"my_repo": true, "other_repo": false}}////// The boolean on each repo indicates whether it is the index site for the/// domain (true) or a sub-path site (false). At most one repo may be true.#[derive(Deserialize)]struct DomainMapping { did: String, /// repo name → is_index repos: HashMap<String, bool>,}
impl DomainMapping { /// Returns the repo that is marked as the index site, if any. fn index_repo(&self) -> Option<&str> { self.repos .iter() .find_map(|(name, &is_index)| if is_index { Some(name.as_str()) } else { None }) }}
/// Build the R2 object key for a given did/repo and intra-site path./// `site_path` should start with a `/` or be empty.fn r2_key(did: &str, repo: &str, site_path: &str) -> String { let base = format!("{}/{}/", did, repo); if site_path.is_empty() || site_path == "/" { format!("{}index.html", base) } else { let trimmed = site_path.trim_start_matches('/'); if trimmed.is_empty() || trimmed.ends_with('/') { format!("{}{}index.html", base, trimmed) } else { format!("{}{}", base, trimmed) } }}
/// Fetch an object from R2, falling back to appending /index.html if the/// key looks like a directory (no file extension in the last segment).async fn fetch_from_r2(bucket: &Bucket, key: &str) -> Result<Option<Object>> { if let Some(obj) = bucket.get(key).execute().await? { return Ok(Some(obj)); }
let last_segment = key.rsplit('/').next().unwrap_or(key); if !last_segment.contains('.') { let index_key = format!("{}/index.html", key.trim_end_matches('/')); if let Some(obj) = bucket.get(&index_key).execute().await? { return Ok(Some(obj)); } }
Ok(None)}
/// Build a Response from an R2 Object, forwarding the content-type header.fn response_from_object(obj: Object) -> Result<Response> { let content_type = obj .http_metadata() .content_type .unwrap_or_else(|| "application/octet-stream".to_string());
let body = obj.body().ok_or_else(|| Error::RustError("empty R2 body".into()))?; let mut resp = Response::from_body(body.response_body()?)?; resp.headers_mut().set("Content-Type", &content_type)?; resp.headers_mut().set("Cache-Control", "public, max-age=60")?; Ok(resp)}
fn is_excluded(path: &str) -> bool { let excluded = ["/.well-known/atproto-did"]; excluded.iter().any(|&prefix| path.starts_with(prefix))}
#[event(fetch)]async fn fetch(req: Request, env: Env, _ctx: Context) -> Result<Response> { let kv = env.kv("SITES")?; let bucket = env.bucket("SITES_BUCKET")?;
// Extract host, stripping any port. let host = req.headers().get("host")?.unwrap_or_default(); let host = host.split(':').next().unwrap_or("").to_string();
if host.is_empty() { return Response::error("Bad Request: missing host", 400); }
let url = req.url()?; let path = url.path();
if is_excluded(path) { return Fetch::Request(req).send().await; }
// Single KV lookup for the whole domain. let mapping = match kv.get(&host).text().await? { Some(raw) => match serde_json::from_str::<DomainMapping>(&raw) { Ok(m) => m, Err(_) => return Response::error("Internal Error: bad mapping", 500), }, None => return Response::error("site not found!", 404), };
let path = url.path(); // always starts with "/"
// First path segment, e.g. "my_repo" from "/my_repo/page.html" let first_segment = path .trim_start_matches('/') .split('/') .next() .unwrap_or("") .to_string();
// 1. sub-path site // If the first path segment matches a non-index repo, serve from it. if !first_segment.is_empty() { if let Some(&is_index) = mapping.repos.get(&first_segment) { if !is_index { // Strip the leading "/{first_segment}" to get the intra-site path. let site_path = path .trim_start_matches('/') .trim_start_matches(&first_segment) .to_string();
let key = r2_key(&mapping.did, &first_segment, &site_path); return match fetch_from_r2(&bucket, &key).await? { Some(obj) => response_from_object(obj), None => Response::error("Not Found", 404), }; } } }
// 2. index site // Fall back to the repo marked as the index site, serving the full path. if let Some(index_repo) = mapping.index_repo() { let key = r2_key(&mapping.did, index_repo, path); return match fetch_from_r2(&bucket, &key).await? { Some(obj) => response_from_object(obj), None => Response::error("Not Found", 404), }; }
Response::error("Not Found", 404)}