✨ Add configuration for Hermes to use it globally, refacto & updates tests

Sources/Hermes/Hermes.swift

@@ -66,74 +66,83 @@ public struct Resource<T: Codable> {
     }
 }
 
-public struct Hermes {
+public final class Hermes {
+    public static let shared = Hermes()
+    private var config: HermesConfiguration
     
-    public init() { }
+    private init(config: HermesConfiguration = HermesConfiguration()) {
+        self.config = config
+    }
+    
+    public func configure(_ config: HermesConfiguration) {
+        self.config = config
+    }
     
     private var defaultHeaders: [String: String] {
         var headers = ["Content-Type": "application/json"]
-        let defaults = UserDefaults.standard
-        guard let token = defaults.string(forKey: "authToken") else {
-            return headers
-        }
-        
+        if let token = UserDefaults.standard.string(forKey: "authToken") {
             headers["Authorization"] = "Bearer \(token)"
-        
+        }
+        headers.merge(config.defaultHeaders) { (_, new) in new }
         return headers
     }
     
     public func load<T: Codable>(_ resource: Resource<T>) async throws -> T {
         
         var request = URLRequest(url: resource.url)
+        request.httpMethod = resource.method.name
         
         switch resource.method {
         case .get(let queryItems):
+            if let queryItems = queryItems {
                 var components = URLComponents(url: resource.url, resolvingAgainstBaseURL: false)
                 components?.queryItems = queryItems
-            guard let url = components?.url else {
-                throw NetworkError.badRequest
+                request.url = components?.url
             }
-            
-            request = URLRequest(url: url)
-            
         case .post(let data),
              .put(let data),
              .patch(let data):
-            request.httpMethod = resource.method.name
             request.httpBody = data
-            
         case .delete:
-            request.httpMethod = resource.method.name
+            break
         }
         
+        request.allHTTPHeaderFields = defaultHeaders
+        
         let configuration = URLSessionConfiguration.default
         configuration.httpAdditionalHeaders = defaultHeaders
         let session = URLSession(configuration: configuration)
         
         let (data, response) = try await session.data(for: request)
         
-        guard let response = response as? HTTPURLResponse else {
+        guard let httpResponse = response as? HTTPURLResponse else {
             throw NetworkError.invalidResponse
         }
         
-        if response.statusCode != 200 {
+        try validate(response: httpResponse)
+        
+        let decoder = JSONDecoder()
+        decoder.keyDecodingStrategy = config.decodingStrategy
+        
+        do {
+            return try decoder.decode(resource.modelType, from: data)
+        } catch {
+            throw NetworkError.decodingError
+        }
+    }
+    
+    private func validate(response: HTTPURLResponse) throws {
         switch response.statusCode {
+            case 200...299:
+                return
+            case 400:
+                throw NetworkError.badRequest
             case 404:
                 throw NetworkError.notFound
             case 500:
-                    throw NetworkError.serverError(response.description)
+                throw NetworkError.serverError("Internal Server Error")
             default:
                 throw NetworkError.invalidResponse
         }
     }
-        
-        let decoder = JSONDecoder()
-        decoder.keyDecodingStrategy = .convertFromSnakeCase
-        
-        guard let result = try? decoder.decode(resource.modelType, from: data) else {
-            throw NetworkError.decodingError
-        }
-        
-        return result
-    }
 }

Sources/Hermes/HermesConfiguration.swift

@@ -0,0 +1,18 @@
+//
+//  HermesConfiguration.swift
+//
+//
+//  Created by Victor on 28/05/2024.
+//
+
+import Foundation
+
+public struct HermesConfiguration {
+    var defaultHeaders: [String: String] = [:]
+    var decodingStrategy: JSONDecoder.KeyDecodingStrategy = .useDefaultKeys
+    
+    public init(defaultHeaders: [String: String] = [:], decodingStrategy: JSONDecoder.KeyDecodingStrategy = .useDefaultKeys) {
+        self.defaultHeaders = defaultHeaders
+        self.decodingStrategy = decodingStrategy
+    }
+}

Tests/HermesTests/HermesTests.swift

@@ -1,14 +1,24 @@
-import XCTest
 @testable import Hermes
+import XCTest
 
 final class HermesTests: XCTestCase {
+    override func setUp() {
+        super.setUp()
+        configureHermes()
+    }
+    
+    private func configureHermes() {
+        let defaultHeaders = ["Custom-Header": "HeaderValue"]
+        let decodingStrategy = JSONDecoder.KeyDecodingStrategy.convertFromSnakeCase
+        let config = HermesConfiguration(defaultHeaders: defaultHeaders, decodingStrategy: decodingStrategy)
+        Hermes.shared.configure(config)
+    }
     
     func testGetRequest() async throws {
-        let hermes = Hermes()
         let queryParams = [URLQueryItem(name: "foo", value: "bar")]
         let resource = Resource(url: URL(string: "https://httpbin.org/get")!, method: .get(queryParams), modelType: GetResponse.self)
         
-        let getResponse = try await hermes.load(resource)
+        let getResponse = try await Hermes.shared.load(resource)
         
         XCTAssertEqual(getResponse.url, "https://httpbin.org/get?foo=bar")
         XCTAssertEqual(getResponse.args.count, 1)
@@ -16,52 +26,48 @@ final class HermesTests: XCTestCase {
     }
     
     func testPostRequest() async throws {
-        let hermes = Hermes()
         let postDatas = try? JSONEncoder().encode(["foo": "bar"])
         let resource = Resource(url: URL(string: "https://httpbin.org/post")!, method: .post(postDatas), modelType: PostResponse.self)
         
-        let postResponse = try await hermes.load(resource)
+        let postResponse = try await Hermes.shared.load(resource)
         
         XCTAssertEqual(postResponse.url, "https://httpbin.org/post")
         XCTAssertEqual(postResponse.args.count, 0)
         XCTAssertNotNil(postResponse.json)
-        XCTAssertEqual(postResponse.json!.count, 1)
+        XCTAssertEqual(postResponse.json?.count, 1)
         XCTAssertGreaterThan(postResponse.headers.count, 0)
     }
     
     func testPutRequest() async throws {
-        let hermes = Hermes()
         let postDatas = try? JSONEncoder().encode(["foo": "bar"])
         let resource = Resource(url: URL(string: "https://httpbin.org/put")!, method: .put(postDatas), modelType: PostResponse.self)
         
-        let putResponse = try await hermes.load(resource)
+        let putResponse = try await Hermes.shared.load(resource)
         
         XCTAssertEqual(putResponse.url, "https://httpbin.org/put")
         XCTAssertEqual(putResponse.args.count, 0)
         XCTAssertNotNil(putResponse.json)
-        XCTAssertEqual(putResponse.json!.count, 1)
+        XCTAssertEqual(putResponse.json?.count, 1)
         XCTAssertGreaterThan(putResponse.headers.count, 0)
     }
     
     func testPatchRequest() async throws {
-        let hermes = Hermes()
         let postDatas = try? JSONEncoder().encode(["foo": "bar"])
         let resource = Resource(url: URL(string: "https://httpbin.org/patch")!, method: .patch(postDatas), modelType: PostResponse.self)
         
-        let patchResponse = try await hermes.load(resource)
+        let patchResponse = try await Hermes.shared.load(resource)
         
         XCTAssertEqual(patchResponse.url, "https://httpbin.org/patch")
         XCTAssertEqual(patchResponse.args.count, 0)
         XCTAssertNotNil(patchResponse.json)
-        XCTAssertEqual(patchResponse.json!.count, 1)
+        XCTAssertEqual(patchResponse.json?.count, 1)
         XCTAssertGreaterThan(patchResponse.headers.count, 0)
     }
     
     func testDeleteRequest() async throws {
-        let hermes = Hermes()
         let resource = Resource(url: URL(string: "https://httpbin.org/delete")!, method: .delete, modelType: PostResponse.self)
         
-        let deleteResponse = try await hermes.load(resource)
+        let deleteResponse = try await Hermes.shared.load(resource)
         
         XCTAssertEqual(deleteResponse.url, "https://httpbin.org/delete")
         XCTAssertEqual(deleteResponse.args.count, 0)
@@ -70,35 +76,41 @@ final class HermesTests: XCTestCase {
     }
     
     func testNotFound() async throws {
-        let hermes = Hermes()
         let resource = Resource(url: URL(string: "https://httpbin.org/status/404")!, method: .get(), modelType: GetResponse.self)
         
         do {
-            let _ = try await hermes.load(resource)
+            let _ = try await Hermes.shared.load(resource)
+            XCTFail("Expected to throw NetworkError.notFound")
         } catch NetworkError.notFound {
             XCTAssert(true)
+        } catch {
+            XCTFail("Unexpected error: \(error)")
         }
     }
     
     func testServerError() async throws {
-        let hermes = Hermes()
         let resource = Resource(url: URL(string: "https://httpbin.org/status/500")!, method: .get(), modelType: GetResponse.self)
         
         do {
-            let _ = try await hermes.load(resource)
+            let _ = try await Hermes.shared.load(resource)
+            XCTFail("Expected to throw NetworkError.serverError")
         } catch NetworkError.serverError(_) {
             XCTAssert(true)
+        } catch {
+            XCTFail("Unexpected error: \(error)")
         }
     }
     
     func testDecodeError() async throws {
-        let hermes = Hermes()
         let resource = Resource(url: URL(string: "https://httpbin.org/get")!, method: .get(), modelType: DummyResponse.self)
         
         do {
-            let _ = try await hermes.load(resource)
+            let _ = try await Hermes.shared.load(resource)
+            XCTFail("Expected to throw NetworkError.decodingError")
         } catch NetworkError.decodingError {
             XCTAssert(true)
+        } catch {
+            XCTFail("Unexpected error: \(error)")
         }
     }
 }