feat(hex): Add protobuf definitions for registry v2 support

lib/modules/datasource/hex/v2/index.spec.ts

@@ -0,0 +1,92 @@
+import protobuf from 'protobufjs';
+import upath from 'upath';
+import { Package } from './package';
+import { Signed } from './signed';
+
+function protobufLoad(file: string): Promise<protobuf.Root> {
+  const resolvedFile = upath.join(__dirname, file);
+  return new Promise((resolve, reject) => {
+    protobuf.load(resolvedFile, (err, root) => {
+      if (err) {
+        reject(err);
+        return;
+      }
+
+      if (!root) {
+        reject(new Error('Root is empty'));
+        return;
+      }
+
+      resolve(root);
+    });
+  });
+}
+
+describe('modules/datasource/hex/v2/index', () => {
+  describe('Signed', () => {
+    async function encodeSigned(input: unknown): Promise<Buffer> {
+      const message = Signed.fromJSON(input);
+      const root = await protobufLoad('signed.proto');
+      const x = root.lookupType('Signed').encode(message).finish();
+      return Buffer.from(x);
+    }
+
+    it('roundtrip', async () => {
+      const input = {
+        payload: Buffer.from('foo'),
+        signature: Buffer.from('bar'),
+      };
+      const encodedBuf = await encodeSigned(input);
+
+      const output = Signed.decode(encodedBuf);
+
+      expect(output).toEqual(input);
+    });
+  });
+
+  describe('Package', () => {
+    async function encodePackage(input: unknown): Promise<Buffer> {
+      const message = Package.fromJSON(input);
+      const root = await protobufLoad('package.proto');
+      const x = root.lookupType('Package').encode(message).finish();
+      return Buffer.from(x);
+    }
+
+    it('roundtrip', async () => {
+      const input: Package = {
+        name: 'foo',
+        repository: 'hexpm',
+        releases: [
+          {
+            version: '1.0.0',
+            innerChecksum: new Uint8Array(),
+            dependencies: [],
+          },
+          {
+            version: '2.0.0',
+            innerChecksum: new Uint8Array(),
+            dependencies: [],
+          },
+          {
+            version: '3.0.0',
+            innerChecksum: new Uint8Array(),
+            dependencies: [],
+          },
+        ],
+      };
+      const encodedBuf = await encodePackage(input);
+
+      const output = Package.decode(encodedBuf);
+
+      expect(output).toMatchObject({
+        name: 'foo',
+        repository: 'hexpm',
+        releases: [
+          { version: '1.0.0' },
+          { version: '2.0.0' },
+          { version: '3.0.0' },
+        ],
+      });
+    });
+  });
+});

lib/modules/datasource/hex/v2/package.proto

@@ -0,0 +1,55 @@
+// https://github.com/hexpm/specifications/blob/main/registry/package.proto
+
+syntax = "proto2";
+
+message Package {
+  // All releases of the package
+  repeated Release releases = 1;
+  // Name of package
+  required string name = 2;
+  // Name of repository
+  required string repository = 3;
+}
+
+message Release {
+  // Release version
+  required string version = 1;
+  // sha256 checksum of "inner" package tarball
+  // deprecated in favor of outer_checksum
+  required bytes inner_checksum = 2;
+  // All dependencies of the release
+  repeated Dependency dependencies = 3;
+  // If set the release is retired, a retired release should only be
+  // resolved if it has already been locked in a project
+  optional RetirementStatus retired = 4;
+  // sha256 checksum of outer package tarball
+  // required when encoding but optional when decoding
+  optional bytes outer_checksum = 5;
+}
+
+message RetirementStatus {
+  required RetirementReason reason = 1;
+  optional string message = 2;
+}
+
+enum RetirementReason {
+  RETIRED_OTHER = 0;
+  RETIRED_INVALID = 1;
+  RETIRED_SECURITY = 2;
+  RETIRED_DEPRECATED = 3;
+  RETIRED_RENAMED = 4;
+}
+
+message Dependency {
+  // Package name of dependency
+  required string package = 1;
+  // Version requirement of dependency
+  required string requirement = 2;
+  // If set and true the package is optional (see dependency resolution)
+  optional bool optional = 3;
+  // If set is the OTP application name of the dependency, if not set the
+  // application name is the same as the package name
+  optional string app = 4;
+  // If set, the repository where the dependency is located
+  optional string repository = 5;
+}