OpenAPI format support and generated documentation

Package.swift

@@ -24,7 +24,7 @@ let package = Package(
     dependencies: [
         .package(url: "https://github.com/jpsim/Yams.git", from: "5.0.6"),
         .package(url: "https://github.com/apple/swift-argument-parser.git", from: "1.2.0"),
-        .package(url: "https://github.com/apple/swift-docc-symbolkit.git", from: "1.0.0"),
+        .package(url: "https://github.com/swiftlang/swift-docc-symbolkit.git", from: "1.0.0"),
         .package(url: "https://github.com/mattpolzin/OpenAPIKit.git", from: "3.0.0"),
     ],
     targets: [
@@ -52,8 +52,8 @@ let package = Package(
         .target(
             name: "Integration",
             dependencies: [
-                "OpenAPI", 
-                "DocC", 
+                "OpenAPI",
+                "DocC",
                 "Core",
                 .product(name: "SymbolKit", package: "swift-docc-symbolkit")
             ],
@@ -63,8 +63,8 @@ let package = Package(
         .target(
             name: "OpenAPItoSymbolGraph",
             dependencies: [
-                "OpenAPI", 
-                "DocC", 
+                "OpenAPI",
+                "DocC",
                 "Integration",
                 "Core",
                 .product(name: "SymbolKit", package: "swift-docc-symbolkit")
@@ -98,9 +98,9 @@ let package = Package(
         .testTarget(
             name: "OpenAPItoSymbolGraphTests",
             dependencies: [
-                "OpenAPI", 
-                "DocC", 
-                "Integration", 
+                "OpenAPI",
+                "DocC",
+                "Integration",
                 "OpenAPItoSymbolGraph",
                 "Core",
                 "CLI",

RegistryAPI.docc/Extensions/PackageMetadata.md

@@ -0,0 +1,157 @@
+# ``RegistryAPI/PackageMetadata``
+
+A comprehensive representation of metadata for a Swift package.
+
+## Overview
+
+The `PackageMetadata` structure contains all descriptive information about a Swift package, including details about the package's author, license, and available versions.
+
+```swift
+// Example: Fetching and using package metadata
+let url = URL(string: "https://registry.example.com/mona/LinkedList")!
+let (data, _) = try await URLSession.shared.data(from: url)
+let metadata = try JSONDecoder().decode(PackageMetadata.self, from: data)
+
+// Use metadata properties
+print("Package name: \(metadata.name)")
+print("Latest version: \(metadata.latestVersion)")
+print("Available versions: \(metadata.versions.joined(separator: ", "))")
+```
+
+Package metadata provides a complete picture of a package, including:
+
+- Basic information like name, version, and description
+- Author and organization information
+- License details
+- Repository location
+- Available versions
+
+## Topics
+
+### Essential Properties
+
+- ``name``
+- ``description``
+- ``version``
+- ``latestVersion``
+
+### Author Information
+
+- ``author``
+- ``PackageAuthor``
+- ``organization``
+- ``PackageOrganization``
+
+### Package Versions
+
+- ``versions``
+- ``listedVersions``
+- ``ListedRelease``
+
+### Package Resources
+
+- ``repository``
+- ``license``
+- ``readmeURL``
+- ``keywords``
+
+## Structure
+
+```json
+{
+  "name": "LinkedList",
+  "description": "A linked list implementation for Swift",
+  "keywords": ["data-structure", "list", "collection"],
+  "version": "1.1.1",
+  "author": {
+    "name": "J. Appleseed",
+    "email": "japplseed@example.com",
+    "url": "https://example.com/japplseed"
+  },
+  "organization": {
+    "name": "Example Organization",
+    "url": "https://example.com",
+    "description": "Organization that maintains the package"
+  },
+  "license": {
+    "name": "MIT",
+    "url": "https://opensource.org/licenses/MIT"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mona/LinkedList.git"
+  },
+  "readmeURL": "https://registry.example.com/mona/LinkedList/1.1.1/README.md",
+  "latestVersion": "1.1.1",
+  "versions": ["1.0.0", "1.0.1", "1.1.0", "1.1.1"]
+}
+```
+
+## Accessing Metadata
+
+You can retrieve package metadata using the package identifier endpoint:
+
+```swift
+func fetchPackageMetadata(scope: String, name: String) async throws -> PackageMetadata {
+    let url = URL(string: "https://registry.example.com/\(scope)/\(name)")!
+
+    var request = URLRequest(url: url)
+    request.addValue("application/json", forHTTPHeaderField: "Accept")
+
+    let (data, response) = try await URLSession.shared.data(for: request)
+
+    guard let httpResponse = response as? HTTPURLResponse,
+          (200..<300).contains(httpResponse.statusCode) else {
+        throw FetchError.invalidResponse
+    }
+
+    return try JSONDecoder().decode(PackageMetadata.self, from: data)
+}
+```
+
+## Required and Optional Fields
+
+The following fields are required in every package metadata response:
+
+- `name`: Package name
+- `version`: Current version
+- `description`: Brief description of the package
+- `license`: License information
+
+All other fields are optional and may not be present in all responses.
+
+## Handling Missing Fields
+
+When working with package metadata, it's important to handle optional fields gracefully:
+
+```swift
+// Example: Handling optional fields
+func displayPackageInfo(_ metadata: PackageMetadata) {
+    // Required fields
+    print("Package: \(metadata.name)")
+    print("Description: \(metadata.description)")
+
+    // Optional fields
+    if let author = metadata.author {
+        print("Author: \(author.name)")
+        if let email = author.email {
+            print("Contact: \(email)")
+        }
+    }
+
+    if let org = metadata.organization {
+        print("Organization: \(org.name)")
+    }
+
+    // Keywords
+    if let keywords = metadata.keywords, !keywords.isEmpty {
+        print("Keywords: \(keywords.joined(separator: ", "))")
+    }
+}
+```
+
+## See Also
+
+- ``RegistryAPI/__scope___name_``
+- ``RegistryAPI/ReleaseResource``
+- ``RegistryAPI/ListedRelease`` 

RegistryAPI.docc/RegistryAPI.md

@@ -1,7 +1,66 @@
-# RegistryAPI
+# ``RegistryAPI``
 
-Swift Package Registry API documentation.
+@Metadata {
+    @DisplayName("Registry API")
+    @TitleHeading("Swift Package Registry API")
+    @DocumentationExtension(mergeBehavior: append)
+}
+
+Interact with Swift packages through a standardized API for publishing, discovering, and retrieving packages.
 
 ## Overview
 
-This documentation provides details about the Swift Package Registry API endpoints and schemas, generated from the OpenAPI specification. 
+The Swift Package Registry API provides a robust interface for package management that follows open standards. Using this API, you can:
+
+- **Discover** packages through search and metadata
+- **Retrieve** package releases including source code and manifests
+- **Publish** your own packages for others to use
+- **Authenticate** to access private packages or perform privileged operations
+
+![A diagram showing the workflow of package discovery, retrieval and publishing](registry_workflow.png)
+
+The API follows RESTful principles with well-defined endpoints for each resource type. All requests and responses use standard HTTP methods and status codes, with JSON-formatted data.
+
+```swift
+// Example: Retrieve package metadata
+let url = URL(string: "https://registry.example.com/mona/LinkedList")!
+let (data, response) = try await URLSession.shared.data(from: url)
+let metadata = try JSONDecoder().decode(PackageMetadata.self, from: data)
+
+print("Package: \(metadata.name)")
+print("Latest version: \(metadata.latestVersion)")
+print("Available versions: \(metadata.versions.joined(separator: ", "))")
+```
+
+## Topics
+
+### API Endpoints
+
+- <doc:GettingStarted>
+- ``_identifiers``
+- ``_login``
+- ``__scope___name_``
+- ``__scope___name___version_``
+- ``__scope___name___version_.zip``
+- ``__scope___name___version__package.swift``
+
+### Data Models
+
+- ``PackageMetadata``
+- ``ReleaseResource``
+- ``ProblemDetails``
+- ``Identifier``
+- ``Identifiers``
+- ``Releases``
+- ``ReleaseMetadata``
+- ``ReleaseSignature``
+- ``PublishResponse``
+
+### Guides
+
+- <doc:Authentication>
+- <doc:Publishing>
+- <doc:ErrorCodes>
+- <doc:RateLimiting>
+- <doc:Security>
+- <doc:Performance>

RegistryAPI.docc/Resources/VersionEndpoint.md

@@ -0,0 +1,81 @@
+# ``RegistryAPI/__scope___name___version_``
+
+Interact with a specific version of a Swift package.
+
+## Overview
+
+This endpoint provides access to a specific version of a package in the registry. It supports both retrieving metadata about a version and publishing new versions.
+
+## Getting Version Information
+
+Retrieve information about a specific version of a package:
+
+```http
+GET /{scope}/{name}/{version}
+```
+
+### Response
+
+On success, returns a `200 OK` response with a `ReleaseResource` object in the response body:
+
+```json
+{
+  "id": "mona/LinkedList/1.1.1",
+  "version": "1.1.1",
+  "resources": [
+    {
+      "name": "source-archive",
+      "type": "application/zip",
+      "checksum": "a2ac54cf25fbc1ad0028f03f0aa4b96833b83bb05a14e510892bb27dea4dc812",
+      "signing": {
+        "signatureBase64Encoded": "ZXhhbXBsZSBzaWduYXR1cmU=",
+        "signatureFormat": "cms-1.0.0"
+      }
+    }
+  ],
+  "metadata": {
+    "author": {
+      "name": "J. Appleseed"
+    },
+    "description": "A linked list implementation for Swift",
+    "licenseURL": "https://opensource.org/licenses/MIT"
+  }
+}
+```
+
+## Publishing a New Version
+
+To publish a new version of a package:
+
+```http
+PUT /{scope}/{name}/{version}
+Content-Type: application/octet-stream
+X-Swift-Package-Signature: sha256=[Base64 encoded signature]
+```
+
+The request body should contain the package archive in ZIP format.
+
+### Response Codes
+
+When publishing a package version, the registry may respond with:
+
+| Status Code | Description |
+|-------------|-------------|
+| 201 Created | Version published successfully |
+| 202 Accepted | Version accepted for processing |
+| 400 Bad Request | Invalid request format |
+| 401 Unauthorized | Authentication required |
+| 403 Forbidden | Insufficient permissions |
+| 409 Conflict | Version already exists |
+| 413 Payload Too Large | Package size exceeds limits |
+| 422 Unprocessable Entity | Package validation failed |
+
+## Availability
+
+The endpoint is available for both public and private packages. Private packages require authentication.
+
+## See Also
+
+- ``RegistryAPI/__scope___name_``
+- ``RegistryAPI/__scope___name___version_.zip``
+- ``RegistryAPI/ReleaseResource``