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TwitterAPIRequest.swift
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245 lines (210 loc) · 8.16 KB
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import Foundation
public enum HTTPMethod: String {
case get = "GET"
case post = "POST"
case put = "PUT"
case delete = "DELETE"
public var prefersQueryParameters: Bool {
switch self {
case .get, .delete:
return true
default:
return false
}
}
}
public enum BodyContentType: String {
case wwwFormUrlEncoded = "application/x-www-form-urlencoded"
/// In this case use MultipartFormDataPart as a parameter
/// example: UploadMediaAppendRequestV1.swift
case multipartFormData = "multipart/form-data"
case json = "application/json; charset=UTF-8"
}
public enum MultipartFormDataPart {
case value(name: String, value: Any) // value is stringified with "String(describing:)"
case data(name: String, value: Data, filename: String, mimeType: String)
var name: String {
switch self {
case .value(let name, _):
return name
case .data(let name, _, _, _):
return name
}
}
}
extension MultipartFormDataPart: Equatable {
public static func == (lhs: MultipartFormDataPart, rhs: MultipartFormDataPart) -> Bool {
switch (lhs, rhs) {
case let (.value(name: ln, value: lv), .value(name: rn, value: rv)):
return ln == rn && type(of: lv) == type(of: rv) && String(describing: lv) == String(describing: rv)
case let (
.data(name: ln, value: lv, filename: lf, mimeType: lm),
.data(name: rn, value: rv, filename: rf, mimeType: rm)
):
return ln == rn
&& lv == rv
&& lf == rf
&& lm == rm
default:
return false
}
}
}
public protocol TwitterAPIRequest {
var method: HTTPMethod { get }
var baseURLType: TwitterBaseURLType { get }
var path: String { get }
var parameters: [String: Any] { get }
var queryParameters: [String: Any] { get }
var bodyParameters: [String: Any] { get }
var bodyContentType: BodyContentType { get }
}
extension TwitterAPIRequest {
public var baseURLType: TwitterBaseURLType {
return .api
}
public var bodyContentType: BodyContentType {
return .wwwFormUrlEncoded
}
public var parameters: [String: Any] {
return [:]
}
public var queryParameters: [String: Any] {
if method.prefersQueryParameters {
return parameters
}
return [:]
}
public var bodyParameters: [String: Any] {
if !method.prefersQueryParameters {
return parameters
}
return [:]
}
}
extension TwitterAPIRequest {
func buildRequest(environment: TwitterAPIEnvironment) throws -> URLRequest {
guard
var urlComponent = URLComponents(
url: requestURL(for: environment),
resolvingAgainstBaseURL: true
)
else {
throw TwitterAPIKitError.requestFailed(reason: .invalidURL(url: ""))
}
if !queryParameters.isEmpty {
urlComponent.percentEncodedQueryItems =
queryParameters
.sorted(by: { a, b in a.key < b.key })
.map { .init(name: $0.urlEncodedString, value: "\($1)".urlEncodedString) }
}
var request = URLRequest(url: urlComponent.url!)
request.httpMethod = method.rawValue
if !bodyParameters.isEmpty {
switch bodyContentType {
case .wwwFormUrlEncoded:
request.setValue(bodyContentType.rawValue, forHTTPHeaderField: "Content-Type")
let query = bodyParameters.urlEncodedQueryString
guard let data = query.data(using: .utf8) else {
throw TwitterAPIKitError.requestFailed(reason: .cannotEncodeStringToData(string: query))
}
request.httpBody = data
case .multipartFormData:
guard let parts = Array(bodyParameters.values) as? [MultipartFormDataPart] else {
throw TwitterAPIKitError.requestFailed(
reason: .invalidParameter(
parameter: bodyParameters,
cause:
"Parameter must be specified in `MultipartFormDataPart` for `BodyContentType.multipartFormData`."
))
}
let boundary = "TwitterAPIKit-\(UUID().uuidString)"
let contentType = "\(BodyContentType.multipartFormData.rawValue); boundary=\(boundary)"
request.setValue(contentType, forHTTPHeaderField: "Content-Type")
request.httpBody = try multipartFormData(
boundary: boundary, parts: parts.sorted(by: { $0.name < $1.name }))
request.setValue(
String(request.httpBody?.count ?? 0), forHTTPHeaderField: "Content-Length")
case .json:
let param = bodyParameters
guard JSONSerialization.isValidJSONObject(param) else {
throw TwitterAPIKitError.requestFailed(reason: .jsonSerializationFailed(obj: param))
}
do {
request.httpBody = try JSONSerialization.data(
withJSONObject: param, options: []
)
request.setValue(bodyContentType.rawValue, forHTTPHeaderField: "Content-Type")
} catch {
// This path probably won't pass because it is pre-checked with `isValidJSONObject`.
throw TwitterAPIKitError.requestFailed(reason: .jsonSerializationFailed(obj: param))
}
}
}
return request
}
func requestURL(for environment: TwitterAPIEnvironment) -> URL {
return environment.baseURL(for: baseURLType).appendingPathComponent(path)
}
var parameterForOAuth: [String: Any] {
switch bodyContentType {
case .wwwFormUrlEncoded:
return parameters
case .json, .multipartFormData:
// parameter is empty
return [:]
}
}
private func multipartFormData(boundary: String, parts: [MultipartFormDataPart]) throws -> Data {
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types#multipartform-data
var body = Data()
let boundaryDelimiter = "--\(boundary)"
let lineBreak = "\r\n"
for part in parts {
try body.appendBody(boundaryDelimiter)
try body.appendBody(lineBreak)
switch part {
case let .value(name: name, value: value):
try body.appendBody("Content-Disposition: form-data; name=\"\(name)\"")
try body.appendBody(lineBreak)
try body.appendBody(lineBreak)
try body.appendBody(String(describing: value))
try body.appendBody(lineBreak)
case let .data(name: name, value: value, filename: filename, mimeType: mimeType):
try body.appendBody(
"Content-Disposition: form-data; name=\"\(name)\"; filename=\"\(filename)\""
)
try body.appendBody(lineBreak)
if !mimeType.isEmpty {
try body.appendBody("Content-Type: \(mimeType)")
}
try body.appendBody(lineBreak)
try body.appendBody(lineBreak)
body.append(value)
try body.appendBody(lineBreak)
}
}
try body.appendBody(boundaryDelimiter)
try body.appendBody("--")
try body.appendBody(lineBreak)
return body
}
}
extension TwitterAPIEnvironment {
fileprivate func baseURL(for type: TwitterBaseURLType) -> URL {
switch type {
case .twitter: return twitterURL
case .api: return apiURL
case .upload: return uploadURL
}
}
}
extension Data {
fileprivate mutating func appendBody(_ string: String) throws {
if let data = string.data(using: .utf8) {
append(data)
} else {
throw TwitterAPIKitError.requestFailed(reason: .cannotEncodeStringToData(string: string))
}
}
}