Implemented the BearerAuthMiddleware middleware in the library target.

Sources/ASConnectService/Catalogs/ASConnectService.docc/Library.md

@@ -59,26 +59,11 @@ The App Store Connect API requires authentication using API keys. You'll need to
 
 1. Create an API key in App Store Connect
 2. Generate a signed JWT token using your key ID, issuer ID, and private key
-3. Inject the token into each request via an OpenAPI middleware
+3. Pass the token to the built-in ``BearerAuthMiddleware`` when creating the client
 
 ```swift
-import OpenAPIRuntime
-
-struct BearerAuthMiddleware: ClientMiddleware {
-    let token: String
-
-    func intercept(
-        _ request: HTTPRequest,
-        body: HTTPBody?,
-        baseURL: URL,
-        operationID: String,
-        next: @Sendable (HTTPRequest, HTTPBody?, URL) async throws -> (HTTPResponse, HTTPBody?)
-    ) async throws -> (HTTPResponse, HTTPBody?) {
-        var request = request
-        request.headerFields[.authorization] = "Bearer \(token)"
-        return try await next(request, body, baseURL)
-    }
-}
+import ASConnectService
+import OpenAPIURLSession
 
 let client = Client(
     serverURL: try Servers.server1(),
@@ -87,6 +72,8 @@ let client = Client(
 )
 ```
 
+The ``BearerAuthMiddleware`` automatically injects the `Authorization` header with the Bearer token into every outgoing request.
+
 ## Supported Platforms
 
 - iOS 13.0+
@@ -108,6 +95,10 @@ let client = Client(
 
 - ``Client``: The main API client for making requests
 
+### Authentication
+
+- ``BearerAuthMiddleware``: A client middleware that injects a Bearer token into outgoing HTTP requests
+
 ### API Endpoints
 
 The package provides access to all App Store Connect API endpoints including:

Sources/ASConnectService/Sources/Public/Middlewares/BearerAuthMiddleware.swift

@@ -0,0 +1,80 @@
+// ===----------------------------------------------------------------------===
+//
+// This source file is part of the ASConnectService open source project
+//
+// Copyright (c) 2026 Röck+Cöde VoF. and the ASConnectService project authors
+// Licensed under Apache license v2.0
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of ASConnectService project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// ===----------------------------------------------------------------------===
+
+import struct Foundation.URL
+import struct Foundation.URLComponents
+import struct Foundation.URLQueryItem
+import struct HTTPTypes.HTTPField
+import struct HTTPTypes.HTTPFields
+import struct HTTPTypes.HTTPRequest
+import struct HTTPTypes.HTTPResponse
+import protocol OpenAPIRuntime.ClientMiddleware
+import class OpenAPIRuntime.HTTPBody
+
+/// A client middleware that injects a Bearer authentication token into outgoing HTTP requests.
+///
+/// This middleware appends an `Authorization` header with a Bearer token to every request
+/// before forwarding it to the next handler in the middleware chain. It is intended for use
+/// with the App Store Connect API, which requires JSON Web Token (JWT) authentication.
+///
+/// ## Usage
+///
+/// ```swift
+/// let middleware = BearerAuthMiddleware(token: "your-jwt-token")
+/// ```
+public struct BearerAuthMiddleware {
+    // MARK: Properties
+
+    /// The Bearer token to include in the `Authorization` header of each request.
+    private let token: String
+
+    // MARK: Initializers
+
+    /// Creates a new middleware instance with the given Bearer token.
+    /// - Parameter token: A JSON Web Token (JWT) string used to authenticate requests to the App Store Connect API.
+    init(token: String) {
+        self.token = token
+    }
+}
+
+// MARK: - ClientMiddleware
+
+extension BearerAuthMiddleware: ClientMiddleware {
+    // MARK: Methods
+
+    /// Intercepts an outgoing HTTP request and adds a Bearer authentication token to its headers.
+    /// - Parameters:
+    ///   - request: The original HTTP request.
+    ///   - body: The optional body of the request.
+    ///   - baseURL: The base URL for the request.
+    ///   - operationID: The identifier of the API operation being performed.
+    ///   - next: The next handler in the middleware chain.
+    /// - Returns: The HTTP response and optional body returned by the next handler.
+    public func intercept(
+        _ request: HTTPRequest,
+        body: HTTPBody?,
+        baseURL: URL,
+        operationID: String,
+        next: @Sendable (HTTPRequest, HTTPBody?, URL) async throws -> (HTTPResponse, HTTPBody?)
+    ) async throws -> (HTTPResponse, HTTPBody?) {
+        var request = request
+        request.headerFields[.authorization] = "Bearer \(token)"
+
+        return try await next(
+            request,
+            body,
+            baseURL
+        )
+    }
+}