fix(fedora): route through kernel.org mirror

Use the kernel.org Fedora mirror to avoid upstream bot challenges.

Preserve existing /pub/fedora/linux request paths with a Fedora transformer.

Closes #271

README.md

@@ -330,7 +330,7 @@ instance, simply replace the domain and add the platform prefix:
 | Flathub                | `flathub`       | `https://dl.flathub.org/...`                                         | `https://xget.xi-xu.me/flathub/...`                                               |
 | Debian                 | `debian`        | `https://deb.debian.org/...`                                         | `https://xget.xi-xu.me/debian/...`                                                |
 | Ubuntu                 | `ubuntu`        | `https://archive.ubuntu.com/...`                                     | `https://xget.xi-xu.me/ubuntu/...`                                                |
-| Fedora                 | `fedora`        | `https://dl.fedoraproject.org/...`                                   | `https://xget.xi-xu.me/fedora/...`                                                |
+| Fedora                 | `fedora`        | `https://mirrors.kernel.org/fedora/...`                              | `https://xget.xi-xu.me/fedora/...`                                                |
 | Rocky Linux            | `rocky`         | `https://download.rockylinux.org/...`                                | `https://xget.xi-xu.me/rocky/...`                                                 |
 | openSUSE               | `opensuse`      | `https://download.opensuse.org/...`                                  | `https://xget.xi-xu.me/opensuse/...`                                              |
 | Arch Linux             | `arch`          | `https://geo.mirror.pkgbuild.com/...`                                | `https://xget.xi-xu.me/arch/...`                                                  |
@@ -746,10 +746,10 @@ https://archive.ubuntu.com/ubuntu/pool/main/g/git/git_2.34.1-1ubuntu1.9_amd64.de
 https://xget.xi-xu.me/ubuntu/ubuntu/pool/main/g/git/git_2.34.1-1ubuntu1.9_amd64.deb
 
 # Fedora package original URL
-https://dl.fedoraproject.org/pub/fedora/linux/releases/39/Everything/x86_64/os/Packages/n/nginx-1.24.0-1.fc39.x86_64.rpm
+https://mirrors.kernel.org/fedora/releases/39/Everything/x86_64/os/Packages/n/nginx-1.24.0-1.fc39.x86_64.rpm
 
 # Converted (add fedora prefix)
-https://xget.xi-xu.me/fedora/pub/fedora/linux/releases/39/Everything/x86_64/os/Packages/n/nginx-1.24.0-1.fc39.x86_64.rpm
+https://xget.xi-xu.me/fedora/releases/39/Everything/x86_64/os/Packages/n/nginx-1.24.0-1.fc39.x86_64.rpm
 
 # Rocky Linux package original URL
 https://download.rockylinux.org/pub/rocky/9/BaseOS/x86_64/os/Packages/b/bash-5.1.8-6.el9.x86_64.rpm

src/config/platform-catalog.js

@@ -57,7 +57,7 @@ export const PLATFORM_CATALOG = {
   // Linux Distributions
   debian: 'https://deb.debian.org',
   ubuntu: 'https://archive.ubuntu.com',
-  fedora: 'https://dl.fedoraproject.org',
+  fedora: 'https://mirrors.kernel.org/fedora',
   rocky: 'https://download.rockylinux.org',
   opensuse: 'https://download.opensuse.org',
   arch: 'https://geo.mirror.pkgbuild.com',

src/routing/platform-transformers.js

@@ -56,6 +56,15 @@ function transformCratesPath(transformedPath) {
   return `/api/v1/crates${transformedPath}`;
 }
 
+/**
+ * Applies Fedora mirror path normalization.
+ * @param {string} transformedPath
+ * @returns {string} Normalized Fedora mirror path.
+ */
+function transformFedoraPath(transformedPath) {
+  return transformedPath.replace(/^\/pub\/fedora\/linux(?=\/|$)/, '') || '/';
+}
+
 /**
  * Applies Jenkins update-center path normalization.
  * @param {string} transformedPath
@@ -88,6 +97,7 @@ function transformJenkinsPath(transformedPath) {
 /** @type {{ [key: string]: (transformedPath: string) => string }} */
 const PLATFORM_PATH_TRANSFORMERS = {
   crates: transformCratesPath,
+  fedora: transformFedoraPath,
   jenkins: transformJenkinsPath
 };
 

test/unit/platforms.test.js

@@ -143,6 +143,19 @@ describe('Platform Configuration', () => {
       );
     });
 
+    it('should transform Fedora mirror paths correctly', () => {
+      expect(
+        transformPath(
+          '/fedora/pub/fedora/linux/releases/43/Everything/x86_64/os/repodata/repomd.xml',
+          'fedora'
+        )
+      ).toBe('/releases/43/Everything/x86_64/os/repodata/repomd.xml');
+
+      expect(
+        transformPath('/fedora/releases/43/Everything/x86_64/os/repodata/repomd.xml', 'fedora')
+      ).toBe('/releases/43/Everything/x86_64/os/repodata/repomd.xml');
+    });
+
     it('should transform container registry paths correctly', () => {
       expect(
         transformPath('/cr/ghcr/v2/nginxinc/nginx-unprivileged/manifests/latest', 'cr-ghcr')
@@ -204,6 +217,10 @@ describe('Platform Configuration', () => {
       expect(PLATFORMS.flathub).toBe('https://dl.flathub.org');
     });
 
+    it('should use a Fedora mirror that avoids upstream bot challenges', () => {
+      expect(PLATFORMS.fedora).toBe('https://mirrors.kernel.org/fedora');
+    });
+
     it('should have correct container registry base URLs', () => {
       expect(PLATFORMS['cr-ghcr']).toBe('https://ghcr.io');
       expect(PLATFORMS['cr-gcr']).toBe('https://gcr.io');