Added json serialization.

Sources/Request.swift

@@ -64,6 +64,10 @@ extension String {
     static var contentLength: String {
         return "Content-Length"
     }
+
+    static var contentType: String {
+        return "Content-Type"
+    }
 }
 
 

Sources/Response.swift

@@ -5,6 +5,8 @@
 //  Created by Orkhan Alikhanov on 7/4/17.
 //  Copyright © 2017 BiAtoms. All rights reserved.
 //
+import Foundation
+
 public typealias Byte = UInt8
 open class Response {
     open var status: Status
@@ -52,4 +54,13 @@ extension Response {
     class func ok(_ body: String, headers: HeaderDictionary = [:]) -> Self {
         return self.init(.ok, body: body.bytes, headers: headers)
     }
+
+    class func json(_ object: Any, status: Response.Status = .ok, options: JSONSerialization.WritingOptions = .prettyPrinted) -> Response {
+        var response = Response.ok("Could not serialize into json")
+        if JSONSerialization.isValidJSONObject(object) {
+            let data = try! JSONSerialization.data(withJSONObject: object, options: options)
+            response = Response(status, body: Array(data), headers: [.contentType: "application/json"])
+        }
+        return response
+    }
 }

Tests/HttpSwiftTests/HttpSwiftTests.swift

@@ -237,6 +237,22 @@ class HttpSwiftTests: XCTestCase {
         waitForExpectations()
     }
 
+    func testJson() {
+        server.get("testJson") { _ in
+            return .json(["hi": ["I": ["am": ["json": ["array": [1,2,3,4]]]]]], status: .ok, options: [])
+        }
+
+        let ex = expectation(description: "testJson")
+        client.request("/testJson").responseString { r in
+            XCTAssertEqual(r.response?.statusCode, 200)
+            XCTAssertEqual(r.response?.headers["Content-Type"], "application/json")
+            XCTAssertEqual(r.value, "{\"hi\":{\"I\":{\"am\":{\"json\":{\"array\":[1,2,3,4]}}}}}")
+            ex.fulfill()
+        }
+
+        waitForExpectations()
+    }
+
     static var allTests = [
         ("testRoute", testRoute),
         ("testRequestAndResponse", testRequestAndResponse),
@@ -245,6 +261,7 @@ class HttpSwiftTests: XCTestCase {
         ("testMiddleware", testMiddleware),
         ("testRouteMiddleware", testRouteMiddleware),
         ("testRouteGrouping", testRouteGrouping),
+        ("testJson", testJson),
         ]
 
 }