Merge pull request #469 from rust-lang/feat-serve-version-downloads-i…

…ndex.html

feat: serve version downloads `index.html`

terragrunt/accounts/legacy/crates-io-prod/deployed-ref

@@ -1 +1 @@
-585e9aabc4a5387af5c7aaebd68b095c1fcf89af
+fe7f3b92fbe04cd9d36bf36992f653ce27c7e8c7

terragrunt/modules/crates-io/cloudfront-functions/static-router.js

@@ -1,10 +1,16 @@
 function handler(event) {
     var request = event.request;
+    var versionDownloads ='/archive/version-downloads/';
 
     // URL-encode the `+` character in the request URI
     // See more: https://github.com/rust-lang/crates.io/issues/4891
     if (request.uri.includes("+")) {
         request.uri = request.uri.replace("+", "%2B");
+    } else if (request.uri === versionDownloads) {
+        request.uri += 'index.html';
+        return request;
+    } else if (request.uri === '/archive/version-downloads') {
+        return permanentRedirect(versionDownloads);
     }
 
     // cargo versions before 1.24 don't support placeholders in the `dl` field
@@ -19,3 +25,13 @@ function handler(event) {
 
     return request;
 }
+
+function permanentRedirect(destination) {
+    return {
+        statusCode: 301,
+        statusDescription: 'Moved Permanently',
+        headers: {
+            'location': { value: destination },
+        },
+    };
+}

terragrunt/modules/crates-io/compute-static/src/main.rs

@@ -1,4 +1,5 @@
-use fastly::http::{Method, StatusCode, Version};
+use fastly::convert::ToHeaderValue;
+use fastly::http::{header, Method, StatusCode, Version};
 use fastly::{Error, Request, Response};
 use log::{info, warn, LevelFilter};
 use log_fastly::Logger;
@@ -16,6 +17,7 @@ mod log_line;
 
 const DATADOG_APP: &str = "crates.io";
 const DATADOG_SERVICE: &str = "static.crates.io";
+const VERSION_DOWNLOADS: &str = "/archive/version-downloads/";
 
 #[fastly::main]
 fn main(request: Request) -> Result<Response, Error> {
@@ -110,9 +112,17 @@ fn handle_request(config: &Config, mut request: Request) -> Result<Response, Err
         return Ok(response);
     }
 
+    if request.get_url().path() == "/archive/version-downloads" {
+        let mut destination = request.get_url().clone();
+        destination.set_path(VERSION_DOWNLOADS);
+
+        return Ok(permanent_redirect(destination));
+    }
+
     set_ttl(config, &mut request);
     rewrite_urls_with_plus_character(&mut request);
     rewrite_download_urls(&mut request);
+    rewrite_version_downloads_urls(&mut request);
 
     // Database dump is too big to cache on Fastly
     if request.get_url_str().ends_with("db-dump.tar.gz") {
@@ -124,6 +134,12 @@ fn handle_request(config: &Config, mut request: Request) -> Result<Response, Err
     }
 }
 
+fn permanent_redirect(destination: impl ToHeaderValue) -> Response {
+    Response::new()
+        .with_status(StatusCode::PERMANENT_REDIRECT)
+        .with_header(header::LOCATION, destination)
+}
+
 /// Limit HTTP methods
 ///
 /// Clients are only allowed to request resources using GET and HEAD requests. If any other HTTP
@@ -168,6 +184,19 @@ fn rewrite_urls_with_plus_character(request: &mut Request) {
     }
 }
 
+/// Rewrite `/archive/version-downloads/` URLs to `/archive/version-downloads/index.html`
+///
+/// In this way, users can see what files are available for download.
+fn rewrite_version_downloads_urls(request: &mut Request) {
+    let url = request.get_url_mut();
+    let path = url.path();
+
+    if path == VERSION_DOWNLOADS {
+        let new_path = format!("{path}index.html");
+        url.set_path(&new_path);
+    }
+}
+
 /// Rewrite `/crates/{crate}/{version}/download` URLs to
 /// `/crates/{crate}/{crate}-{version}.crate`
 ///