Alamofire/Tests/ResponseTests.swift

// ResponseTests.swift
//
// Copyright (c) 2014–2016 Alamofire Software Foundation (http://alamofire.org/)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import Alamofire
import Foundation
import XCTest

class ResponseDataTestCase: BaseTestCase {
    func testThatResponseDataReturnsSuccessResultWithValidData() {
        // Given
        let URLString = "https://httpbin.org/get"
        let expectation = expectationWithDescription("request should succeed")

        var response: Response<NSData, NSError>?

        // When
        Alamofire.request(.GET, URLString, parameters: ["foo": "bar"])
            .responseData { closureResponse in
                response = closureResponse
                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        if let response = response {
            XCTAssertNotNil(response.request, "request should not be nil")
            XCTAssertNotNil(response.response, "response should not be nil")
            XCTAssertNotNil(response.data, "data should not be nil")
            XCTAssertTrue(response.result.isSuccess, "result should be success")
        } else {
            XCTFail("response should not be nil")
        }
    }

    func testThatResponseDataReturnsFailureResultWithOptionalDataAndError() {
        // Given
        let URLString = "https://invalid-url-here.org/this/does/not/exist"
        let expectation = expectationWithDescription("request should fail with 404")

        var response: Response<NSData, NSError>?

        // When
        Alamofire.request(.GET, URLString, parameters: ["foo": "bar"])
            .responseData { closureResponse in
                response = closureResponse
                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        if let response = response {
            XCTAssertNotNil(response.request, "request should not be nil")
            XCTAssertNil(response.response, "response should be nil")
            XCTAssertNotNil(response.data, "data should not be nil")
            XCTAssertTrue(response.result.isFailure, "result should be failure")
        } else {
            XCTFail("response should not be nil")
        }
    }
}

// MARK: -

class ResponseStringTestCase: BaseTestCase {
    func testThatResponseStringReturnsSuccessResultWithValidString() {
        // Given
        let URLString = "https://httpbin.org/get"
        let expectation = expectationWithDescription("request should succeed")

        var response: Response<String, NSError>?

        // When
        Alamofire.request(.GET, URLString, parameters: ["foo": "bar"])
            .responseString { closureResponse in
                response = closureResponse
                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        if let response = response {
            XCTAssertNotNil(response.request, "request should not be nil")
            XCTAssertNotNil(response.response, "response should not be nil")
            XCTAssertNotNil(response.data, "data should not be nil")
            XCTAssertTrue(response.result.isSuccess, "result should be success")
        } else {
            XCTFail("response should not be nil")
        }
    }

    func testThatResponseStringReturnsFailureResultWithOptionalDataAndError() {
        // Given
        let URLString = "https://invalid-url-here.org/this/does/not/exist"
        let expectation = expectationWithDescription("request should fail with 404")

        var response: Response<String, NSError>?

        // When
        Alamofire.request(.GET, URLString, parameters: ["foo": "bar"])
            .responseString { closureResponse in
                response = closureResponse
                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        if let response = response {
            XCTAssertNotNil(response.request, "request should not be nil")
            XCTAssertNil(response.response, "response should be nil")
            XCTAssertNotNil(response.data, "data should not be nil")
            XCTAssertTrue(response.result.isFailure, "result should be failure")
        } else {
            XCTFail("response should not be nil")
        }
    }
}

// MARK: -

class ResponseJSONTestCase: BaseTestCase {
    func testThatResponseJSONReturnsSuccessResultWithValidJSON() {
        // Given
        let URLString = "https://httpbin.org/get"
        let expectation = expectationWithDescription("request should succeed")

        var response: Response<AnyObject, NSError>?

        // When
        Alamofire.request(.GET, URLString, parameters: ["foo": "bar"])
            .responseJSON { closureResponse in
                response = closureResponse
                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        if let response = response {
            XCTAssertNotNil(response.request, "request should not be nil")
            XCTAssertNotNil(response.response, "response should not be nil")
            XCTAssertNotNil(response.data, "data should not be nil")
            XCTAssertTrue(response.result.isSuccess, "result should be success")
        } else {
            XCTFail("response should not be nil")
        }
    }

    func testThatResponseStringReturnsFailureResultWithOptionalDataAndError() {
        // Given
        let URLString = "https://invalid-url-here.org/this/does/not/exist"
        let expectation = expectationWithDescription("request should fail with 404")

        var response: Response<AnyObject, NSError>?

        // When
        Alamofire.request(.GET, URLString, parameters: ["foo": "bar"])
            .responseJSON { closureResponse in
                response = closureResponse
                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        if let response = response {
            XCTAssertNotNil(response.request, "request should not be nil")
            XCTAssertNil(response.response, "response should be nil")
            XCTAssertNotNil(response.data, "data should not be nil")
            XCTAssertTrue(response.result.isFailure, "result should be failure")
        } else {
            XCTFail("response should not be nil")
        }
    }

    func testThatResponseJSONReturnsSuccessResultForGETRequest() {
        // Given
        let URLString = "https://httpbin.org/get"
        let expectation = expectationWithDescription("request should succeed")

        var response: Response<AnyObject, NSError>?

        // When
        Alamofire.request(.GET, URLString, parameters: ["foo": "bar"])
            .responseJSON { closureResponse in
                response = closureResponse
                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        if let response = response {
            XCTAssertNotNil(response.request, "request should not be nil")
            XCTAssertNotNil(response.response, "response should not be nil")
            XCTAssertNotNil(response.data, "data should not be nil")
            XCTAssertTrue(response.result.isSuccess, "result should be success")

            // The `as NSString` cast is necessary due to a compiler bug. See the following rdar for more info.
            // - https://openradar.appspot.com/radar?id=5517037090635776
            if let args = response.result.value?["args" as NSString] as? [String: String] {
                XCTAssertEqual(args, ["foo": "bar"], "args should match parameters")
            } else {
                XCTFail("args should not be nil")
            }
        } else {
            XCTFail("response should not be nil")
        }
    }

    func testThatResponseJSONReturnsSuccessResultForPOSTRequest() {
        // Given
        let URLString = "https://httpbin.org/post"
        let expectation = expectationWithDescription("request should succeed")

        var response: Response<AnyObject, NSError>?

        // When
        Alamofire.request(.POST, URLString, parameters: ["foo": "bar"])
            .responseJSON { closureResponse in
                response = closureResponse
                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        if let response = response {
            XCTAssertNotNil(response.request, "request should not be nil")
            XCTAssertNotNil(response.response, "response should not be nil")
            XCTAssertNotNil(response.data, "data should not be nil")
            XCTAssertTrue(response.result.isSuccess, "result should be success")

            // The `as NSString` cast is necessary due to a compiler bug. See the following rdar for more info.
            // - https://openradar.appspot.com/radar?id=5517037090635776
            if let form = response.result.value?["form" as NSString] as? [String: String] {
                XCTAssertEqual(form, ["foo": "bar"], "form should match parameters")
            } else {
                XCTFail("form should not be nil")
            }
        } else {
            XCTFail("response should not be nil")
        }
    }
}

// MARK: -

class RedirectResponseTestCase: BaseTestCase {
    var manager: Alamofire.Manager!

    // MARK: Setup and Teardown

    override func setUp() {
        super.setUp()
        manager = Alamofire.Manager(configuration: NSURLSessionConfiguration.ephemeralSessionConfiguration())
    }

    override func tearDown() {
        super.tearDown()
    }

    // MARK: Tests

    func testThatRequestWillPerformHTTPRedirectionByDefault() {
        // Given
        let redirectURLString = "https://www.apple.com"
        let URLString = "https://httpbin.org/redirect-to?url=\(redirectURLString)"

        let expectation = expectationWithDescription("Request should redirect to \(redirectURLString)")

        var request: NSURLRequest?
        var response: NSHTTPURLResponse?
        var data: NSData?
        var error: NSError?

        // When
        manager.request(.GET, URLString)
            .response { responseRequest, responseResponse, responseData, responseError in
                request = responseRequest
                response = responseResponse
                data = responseData
                error = responseError

                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        XCTAssertNotNil(request, "request should not be nil")
        XCTAssertNotNil(response, "response should not be nil")
        XCTAssertNotNil(data, "data should not be nil")
        XCTAssertNil(error, "error should be nil")

        XCTAssertEqual(response?.URL?.URLString ?? "", redirectURLString, "response URL should match the redirect URL")
        XCTAssertEqual(response?.statusCode ?? -1, 200, "response should have a 200 status code")
    }

    func testThatRequestWillPerformRedirectionMultipleTimesByDefault() {
        // Given
        let redirectURLString = "https://httpbin.org/get"
        let URLString = "https://httpbin.org/redirect/5"

        let expectation = expectationWithDescription("Request should redirect to \(redirectURLString)")

        var request: NSURLRequest?
        var response: NSHTTPURLResponse?
        var data: NSData?
        var error: NSError?

        // When
        manager.request(.GET, URLString)
            .response { responseRequest, responseResponse, responseData, responseError in
                request = responseRequest
                response = responseResponse
                data = responseData
                error = responseError

                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        XCTAssertNotNil(request, "request should not be nil")
        XCTAssertNotNil(response, "response should not be nil")
        XCTAssertNotNil(data, "data should not be nil")
        XCTAssertNil(error, "error should be nil")

        XCTAssertEqual(response?.URL?.URLString ?? "", redirectURLString, "response URL should match the redirect URL")
        XCTAssertEqual(response?.statusCode ?? -1, 200, "response should have a 200 status code")
    }

    func testThatTaskOverrideClosureCanPerformHTTPRedirection() {
        // Given
        let redirectURLString = "https://www.apple.com"
        let URLString = "https://httpbin.org/redirect-to?url=\(redirectURLString)"

        let expectation = expectationWithDescription("Request should redirect to \(redirectURLString)")
        let callbackExpectation = expectationWithDescription("Redirect callback should be made")
        let delegate: Alamofire.Manager.SessionDelegate = manager.delegate

        delegate.taskWillPerformHTTPRedirection = { _, _, _, request in
            callbackExpectation.fulfill()
            return request
        }

        var request: NSURLRequest?
        var response: NSHTTPURLResponse?
        var data: NSData?
        var error: NSError?

        // When
        manager.request(.GET, URLString)
            .response { responseRequest, responseResponse, responseData, responseError in
                request = responseRequest
                response = responseResponse
                data = responseData
                error = responseError

                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        XCTAssertNotNil(request, "request should not be nil")
        XCTAssertNotNil(response, "response should not be nil")
        XCTAssertNotNil(data, "data should not be nil")
        XCTAssertNil(error, "error should be nil")

        XCTAssertEqual(response?.URL?.URLString ?? "", redirectURLString, "response URL should match the redirect URL")
        XCTAssertEqual(response?.statusCode ?? -1, 200, "response should have a 200 status code")
    }

    func testThatTaskOverrideClosureWithCompletionCanPerformHTTPRedirection() {
        // Given
        let redirectURLString = "https://www.apple.com"
        let URLString = "https://httpbin.org/redirect-to?url=\(redirectURLString)"

        let expectation = expectationWithDescription("Request should redirect to \(redirectURLString)")
        let callbackExpectation = expectationWithDescription("Redirect callback should be made")
        let delegate: Alamofire.Manager.SessionDelegate = manager.delegate

        delegate.taskWillPerformHTTPRedirectionWithCompletion = { _, _, _, request, completion in
            completion(request)
            callbackExpectation.fulfill()
        }

        var request: NSURLRequest?
        var response: NSHTTPURLResponse?
        var data: NSData?
        var error: NSError?

        // When
        manager.request(.GET, URLString)
            .response { responseRequest, responseResponse, responseData, responseError in
                request = responseRequest
                response = responseResponse
                data = responseData
                error = responseError

                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        XCTAssertNotNil(request, "request should not be nil")
        XCTAssertNotNil(response, "response should not be nil")
        XCTAssertNotNil(data, "data should not be nil")
        XCTAssertNil(error, "error should be nil")

        XCTAssertEqual(response?.URL?.URLString ?? "", redirectURLString, "response URL should match the redirect URL")
        XCTAssertEqual(response?.statusCode ?? -1, 200, "response should have a 200 status code")
    }

    func testThatTaskOverrideClosureCanCancelHTTPRedirection() {
        // Given
        let redirectURLString = "https://www.apple.com"
        let URLString = "https://httpbin.org/redirect-to?url=\(redirectURLString)"

        let expectation = expectationWithDescription("Request should not redirect to \(redirectURLString)")
        let callbackExpectation = expectationWithDescription("Redirect callback should be made")
        let delegate: Alamofire.Manager.SessionDelegate = manager.delegate

        delegate.taskWillPerformHTTPRedirectionWithCompletion = { _, _, _, _, completion in
            callbackExpectation.fulfill()
            completion(nil)
        }

        var request: NSURLRequest?
        var response: NSHTTPURLResponse?
        var data: NSData?
        var error: NSError?

        // When
        manager.request(.GET, URLString)
            .response { responseRequest, responseResponse, responseData, responseError in
                request = responseRequest
                response = responseResponse
                data = responseData
                error = responseError

                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        XCTAssertNotNil(request, "request should not be nil")
        XCTAssertNotNil(response, "response should not be nil")
        XCTAssertNotNil(data, "data should not be nil")
        XCTAssertNil(error, "error should be nil")

        XCTAssertEqual(response?.URL?.URLString ?? "", URLString, "response URL should match the origin URL")
        XCTAssertEqual(response?.statusCode ?? -1, 302, "response should have a 302 status code")
    }

    func testThatTaskOverrideClosureWithCompletionCanCancelHTTPRedirection() {
        // Given
        let redirectURLString = "https://www.apple.com"
        let URLString = "https://httpbin.org/redirect-to?url=\(redirectURLString)"

        let expectation = expectationWithDescription("Request should not redirect to \(redirectURLString)")
        let callbackExpectation = expectationWithDescription("Redirect callback should be made")
        let delegate: Alamofire.Manager.SessionDelegate = manager.delegate

        delegate.taskWillPerformHTTPRedirection = { _, _, _, _ in
            callbackExpectation.fulfill()
            return nil
        }

        var request: NSURLRequest?
        var response: NSHTTPURLResponse?
        var data: NSData?
        var error: NSError?

        // When
        manager.request(.GET, URLString)
            .response { responseRequest, responseResponse, responseData, responseError in
                request = responseRequest
                response = responseResponse
                data = responseData
                error = responseError

                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        XCTAssertNotNil(request, "request should not be nil")
        XCTAssertNotNil(response, "response should not be nil")
        XCTAssertNotNil(data, "data should not be nil")
        XCTAssertNil(error, "error should be nil")

        XCTAssertEqual(response?.URL?.URLString ?? "", URLString, "response URL should match the origin URL")
        XCTAssertEqual(response?.statusCode ?? -1, 302, "response should have a 302 status code")
    }

    func testThatTaskOverrideClosureIsCalledMultipleTimesForMultipleHTTPRedirects() {
        // Given
        let redirectCount = 5
        let redirectURLString = "https://httpbin.org/get"
        let URLString = "https://httpbin.org/redirect/\(redirectCount)"

        let expectation = expectationWithDescription("Request should redirect to \(redirectURLString)")
        let delegate: Alamofire.Manager.SessionDelegate = manager.delegate
        var redirectExpectations = [XCTestExpectation]()
        for index in 0..<redirectCount {
            redirectExpectations.insert(expectationWithDescription("Redirect #\(index) callback was received"), atIndex: 0)
        }

        delegate.taskWillPerformHTTPRedirection = { _, _, _, request in
            if let redirectExpectation = redirectExpectations.popLast() {
                redirectExpectation.fulfill()
            } else {
                XCTFail("Too many redirect callbacks were received")
            }

            return request
        }

        var request: NSURLRequest?
        var response: NSHTTPURLResponse?
        var data: NSData?
        var error: NSError?

        // When
        manager.request(.GET, URLString)
            .response { responseRequest, responseResponse, responseData, responseError in
                request = responseRequest
                response = responseResponse
                data = responseData
                error = responseError

                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        XCTAssertNotNil(request, "request should not be nil")
        XCTAssertNotNil(response, "response should not be nil")
        XCTAssertNotNil(data, "data should not be nil")
        XCTAssertNil(error, "error should be nil")

        XCTAssertEqual(response?.URL?.URLString ?? "", redirectURLString, "response URL should match the redirect URL")
        XCTAssertEqual(response?.statusCode ?? -1, 200, "response should have a 200 status code")
    }

    func testThatTaskOverrideClosureWithCompletionIsCalledMultipleTimesForMultipleHTTPRedirects() {
        // Given
        let redirectCount = 5
        let redirectURLString = "https://httpbin.org/get"
        let URLString = "https://httpbin.org/redirect/\(redirectCount)"

        let expectation = expectationWithDescription("Request should redirect to \(redirectURLString)")
        let delegate: Alamofire.Manager.SessionDelegate = manager.delegate

        var redirectExpectations = [XCTestExpectation]()

        for index in 0..<redirectCount {
            redirectExpectations.insert(expectationWithDescription("Redirect #\(index) callback was received"), atIndex: 0)
        }

        delegate.taskWillPerformHTTPRedirectionWithCompletion = { _, _, _, request, completion in
            if let redirectExpectation = redirectExpectations.popLast() {
                redirectExpectation.fulfill()
            } else {
                XCTFail("Too many redirect callbacks were received")
            }

            completion(request)
        }

        var request: NSURLRequest?
        var response: NSHTTPURLResponse?
        var data: NSData?
        var error: NSError?

        // When
        manager.request(.GET, URLString)
            .response { responseRequest, responseResponse, responseData, responseError in
                request = responseRequest
                response = responseResponse
                data = responseData
                error = responseError

                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        XCTAssertNotNil(request, "request should not be nil")
        XCTAssertNotNil(response, "response should not be nil")
        XCTAssertNotNil(data, "data should not be nil")
        XCTAssertNil(error, "error should be nil")

        XCTAssertEqual(response?.URL?.URLString ?? "", redirectURLString, "response URL should match the redirect URL")
        XCTAssertEqual(response?.statusCode ?? -1, 200, "response should have a 200 status code")
    }

    func testThatRedirectedRequestContainsAllHeadersFromOriginalRequest() {
        // Given
        let redirectURLString = "https://httpbin.org/get"
        let URLString = "https://httpbin.org/redirect-to?url=\(redirectURLString)"
        let headers = [
            "Authorization": "1234",
            "Custom-Header": "foobar",
        ]

        // NOTE: It appears that most headers are maintained during a redirect with the exception of the `Authorization`
        // header. It appears that Apple's strips the `Authorization` header from the redirected URL request. If you
        // need to maintain the `Authorization` header, you need to manually append it to the redirected request.

        manager.delegate.taskWillPerformHTTPRedirection = { session, task, response, request in
            var redirectedRequest = request

            if let
                originalRequest = task.originalRequest,
                headers = originalRequest.allHTTPHeaderFields,
                authorizationHeaderValue = headers["Authorization"]
            {
                let mutableRequest = request.mutableCopy() as! NSMutableURLRequest
                mutableRequest.setValue(authorizationHeaderValue, forHTTPHeaderField: "Authorization")
                redirectedRequest = mutableRequest
            }

            return redirectedRequest
        }

        let expectation = expectationWithDescription("Request should redirect to \(redirectURLString)")

        var response: Response<AnyObject, NSError>?

        // When
        manager.request(.GET, URLString, headers: headers)
            .responseJSON { closureResponse in
                response = closureResponse
                expectation.fulfill()
            }

        waitForExpectationsWithTimeout(timeout, handler: nil)

        // Then
        XCTAssertNotNil(response?.request, "request should not be nil")
        XCTAssertNotNil(response?.response, "response should not be nil")
        XCTAssertNotNil(response?.data, "data should not be nil")
        XCTAssertTrue(response?.result.isSuccess ?? false, "response result should be a success")

        if let
            JSON = response?.result.value as? [String: AnyObject],
            headers = JSON["headers"] as? [String: String]
        {
            XCTAssertEqual(headers["Custom-Header"], "foobar", "Custom-Header should be equal to foobar")
            XCTAssertEqual(headers["Authorization"], "1234", "Authorization header should be equal to 1234")
        }
    }
}