[Feature] UTType Conversion

Sources/MultipartFormData/Boundary.swift

@@ -38,9 +38,12 @@ extension Boundary {
 
         public var debugDescription: String {
             switch self {
-            case .empty: return "Boundary must not be empty."
-            case .tooLong: return "Boundary is too long. Max size is 70 characters."
-            case .noASCII: return "Boundary contains at least one character that is not ASCII compatible."
+            case .empty:
+                return "Boundary must not be empty."
+            case .tooLong:
+                return "Boundary is too long. Max size is 70 characters."
+            case .noASCII:
+                return "Boundary contains at least one character that is not ASCII compatible."
             }
         }
     }

Sources/MultipartFormData/MediaType.swift

@@ -37,6 +37,7 @@ extension MediaType {
     public static let multipartFormData = MediaType(type: "multipart", subtype: "form-data")
 
     public static let textPlain = MediaType(type: "text", subtype: "plain")
+    public static let textCsv = MediaType(type: "text", subtype: "csv")
     public static let textHtml = MediaType(type: "text", subtype: "html")
     public static let textCss = MediaType(type: "text", subtype: "css")
 
@@ -63,6 +64,34 @@ extension MediaType {
 }
 // swiftlint:enable missing_docs
 
+// MARK: - UniformTypeIdentifiers
+
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+
+extension MediaType {
+    /// Create a media type from a uniform type.
+    /// - Parameter uniformType: The uniform type (UTType).
+    @available(macOS 11.0, iOS 14.0, watchOS 7.0, tvOS 14.0, *)
+    public init?(uniformType: UTType) {
+        guard let mimeTypeSplit = uniformType.preferredMIMEType?.split(separator: "/") else { return nil }
+        guard mimeTypeSplit.count == 2 else { return nil }
+        self.type = String(mimeTypeSplit[0])
+        self.subtype = String(mimeTypeSplit[1])
+    }
+}
+
+@available(macOS 11.0, iOS 14.0, watchOS 7.0, tvOS 14.0, *)
+extension UTType {
+    /// Create a uniform type from a media type.
+    /// - Parameter mediaType: The media type.
+    /// - Parameter supertype: Another UTType instance that the resulting type must conform to; for example, UTTypeData.
+    public init?(mediaType: MediaType, conformingTo supertype: UTType = .data) {
+        self.init(mimeType: mediaType._text, conformingTo: supertype)
+    }
+}
+#endif
+
 // MARK: - Debug
 
 extension MediaType: CustomDebugStringConvertible {

Tests/MultipartFormDataTests/BoundaryTests.swift

@@ -9,7 +9,6 @@ import XCTest
 @testable import MultipartFormData
 
 final class BoundaryTests: XCTestCase {
-
     func testEmpty() {
         XCTAssertThrowsError(try Boundary(uncheckedBoundary: "")) { error in
             XCTAssertEqual(error as? Boundary.InvalidBoundaryError, .empty)

Tests/MultipartFormDataTests/Builder/BodyDataBuilderTests.swift

@@ -9,7 +9,6 @@ import XCTest
 @testable import MultipartFormData
 
 final class BodyDataBuilderTests: XCTestCase {
-
     func testSingleData() {
         let data = _buildData {
             Data("a".utf8)

Tests/MultipartFormDataTests/Builder/HTTPHeaderBuilderTests.swift

@@ -9,7 +9,6 @@ import XCTest
 @testable import MultipartFormData
 
 final class HTTPHeaderBuilderTests: XCTestCase {
-
     func testAvailableHeaderCombinations() {
         let dispositionResult = _buildHeader {
             ContentDisposition(name: "a")

Tests/MultipartFormDataTests/Builder/MultipartFormDataBuilderTests.swift

@@ -9,7 +9,6 @@ import XCTest
 @testable import MultipartFormData
 
 final class MultipartFormDataBuilderTests: XCTestCase {
-
     func testSingleSubpart() throws {
         let subparts = _buildSubparts {
             Subpart {

Tests/MultipartFormDataTests/ContentDispositionTests.swift

@@ -9,7 +9,6 @@ import XCTest
 @testable import MultipartFormData
 
 final class ContentDispositionTests: XCTestCase {
-
     func testPercentEncodingError() throws {
         XCTAssertNoThrow(try ContentDisposition(uncheckedName: "a", uncheckedFilename: "a"))
 

Tests/MultipartFormDataTests/ContentTypeTests.swift

@@ -9,7 +9,6 @@ import XCTest
 @testable import MultipartFormData
 
 final class ContentTypeTests: XCTestCase {
-
     func testBoundaryParameters() throws {
         let contentType = ContentType(boundary: try Boundary(uncheckedBoundary: "test"))
 

Tests/MultipartFormDataTests/HTTPHeaderFieldTests.swift

@@ -9,7 +9,6 @@ import XCTest
 @testable import MultipartFormData
 
 final class HTTPHeaderFieldTests: XCTestCase {
-
     func testDebugDescription() {
         let parameter = HTTPHeaderParameter("name", value: "value")
         let testHeaderField = TestHeaderField(value: "value", parameters: [parameter])

Tests/MultipartFormDataTests/HTTPHeaderParameterTests.swift

@@ -9,7 +9,6 @@ import XCTest
 @testable import MultipartFormData
 
 final class HTTPHeaderParameterTests: XCTestCase {
-
     func testArrayText() {
         let singleParameter = [
             HTTPHeaderParameter("test", value: "a")

Tests/MultipartFormDataTests/MediaTypeTests.swift

@@ -6,10 +6,12 @@
 //
 
 import XCTest
+#if canImport(UniformTypeIdentifiers)
+import UniformTypeIdentifiers
+#endif
 @testable import MultipartFormData
 
 final class MediaTypeTests: XCTestCase {
-
     func testText() {
         let mediaType = MediaType(type: "type", subtype: "subtype")
         XCTAssertEqual(mediaType._text, "type/subtype")
@@ -21,4 +23,21 @@ final class MediaTypeTests: XCTestCase {
         let expectedDescription = "type/subtype"
         XCTAssertEqual(mediaType.debugDescription, expectedDescription)
     }
+#if canImport(UniformTypeIdentifiers)
+
+    @available(macOS 11.0, iOS 14.0, watchOS 7.0, tvOS 14.0, *)
+    func testFromUTTypeConversion() throws {
+        let uniformType = try XCTUnwrap(UTType("public.comma-separated-values-text"))
+        let mediaType = try XCTUnwrap(MediaType(uniformType: uniformType))
+
+        XCTAssertEqual(mediaType, .textCsv)
+    }
+
+    @available(macOS 11.0, iOS 14.0, watchOS 7.0, tvOS 14.0, *)
+    func testToUTTypeConversion() throws {
+        let uniformType = try XCTUnwrap(UTType(mediaType: .applicationJson))
+
+        XCTAssertEqual(uniformType.identifier, "public.json")
+    }
+#endif
 }

Tests/MultipartFormDataTests/MultipartFormDataTests.swift

@@ -9,7 +9,6 @@ import XCTest
 @testable import MultipartFormData
 
 final class MultipartFormDataTests: XCTestCase {
-
     func testContentType() throws {
         let boundary = try Boundary(uncheckedBoundary: "test")
         let multipartFormData = MultipartFormData(boundary: boundary)

Tests/MultipartFormDataTests/SubpartTests.swift

@@ -9,7 +9,6 @@ import XCTest
 @testable import MultipartFormData
 
 final class SubpartTests: XCTestCase {
-
     func testDataGeneration() throws {
         let subpart = Subpart(
             contentDisposition: ContentDisposition(name: "a"),

Tests/MultipartFormDataTests/URLRequestTests.swift

@@ -12,7 +12,6 @@ import FoundationNetworking
 #endif
 
 final class URLRequestTests: XCTestCase {
-
     func testFormDataInit() throws {
         let boundary = try Boundary(uncheckedBoundary: "test")
         let multipartFormData = MultipartFormData(boundary: boundary, body: [