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//
// RESTRequestFactory.swift
// MullvadREST
//
// Created by pronebird on 16/04/2022.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import Foundation
import MullvadTypes
extension REST {
final class RequestFactory {
let hostname: String
let pathPrefix: String
let networkTimeout: Duration
let bodyEncoder: JSONEncoder
static func withDefaultAPICredentials(
pathPrefix: String,
bodyEncoder: JSONEncoder
) -> RequestFactory {
RequestFactory(
hostname: defaultAPIHostname,
pathPrefix: pathPrefix,
networkTimeout: defaultAPINetworkTimeout,
bodyEncoder: bodyEncoder
)
}
init(
hostname: String,
pathPrefix: String,
networkTimeout: Duration,
bodyEncoder: JSONEncoder
) {
self.hostname = hostname
self.pathPrefix = pathPrefix
self.networkTimeout = networkTimeout
self.bodyEncoder = bodyEncoder
}
func createRequest(
endpoint: AnyIPEndpoint,
method: HTTPMethod,
pathTemplate: URLPathTemplate
) throws -> REST.Request {
var urlComponents = URLComponents()
urlComponents.scheme = "https"
urlComponents.path = pathPrefix
urlComponents.host = "\(endpoint.ip)"
urlComponents.port = Int(endpoint.port)
let pathString = try pathTemplate.pathString()
let requestURL = urlComponents.url!.appendingPathComponent(pathString)
var request = URLRequest(
url: requestURL,
cachePolicy: .useProtocolCachePolicy,
timeoutInterval: networkTimeout.timeInterval
)
request.httpShouldHandleCookies = false
request.addValue(hostname, forHTTPHeaderField: HTTPHeader.host)
request.addValue("application/json", forHTTPHeaderField: HTTPHeader.contentType)
request.addValue("mullvad-app", forHTTPHeaderField: HTTPHeader.userAgent)
request.httpMethod = method.rawValue
let prefixedPathTemplate = URLPathTemplate(stringLiteral: pathPrefix) + pathTemplate
return REST.Request(
urlRequest: request,
pathTemplate: prefixedPathTemplate
)
}
func createRequestBuilder(
endpoint: AnyIPEndpoint,
method: HTTPMethod,
pathTemplate: URLPathTemplate
) throws -> RequestBuilder {
let request = try createRequest(
endpoint: endpoint,
method: method,
pathTemplate: pathTemplate
)
return RequestBuilder(
restRequest: request,
bodyEncoder: bodyEncoder
)
}
}
struct RequestBuilder {
private var restRequest: REST.Request
private let bodyEncoder: JSONEncoder
init(restRequest: REST.Request, bodyEncoder: JSONEncoder) {
self.restRequest = restRequest
self.bodyEncoder = bodyEncoder
}
mutating func setHTTPBody(value: some Encodable) throws {
restRequest.urlRequest.httpBody = try bodyEncoder.encode(value)
}
mutating func setETagHeader(etag: String) {
var etag = etag
// Enforce weak validator to account for some backend caching quirks.
if etag.starts(with: "\"") {
etag.insert(contentsOf: "W/", at: etag.startIndex)
}
restRequest.urlRequest.setValue(etag, forHTTPHeaderField: HTTPHeader.ifNoneMatch)
}
mutating func setAuthorization(_ authorization: REST.Authorization) {
restRequest.urlRequest.addValue(
"Bearer \(authorization)",
forHTTPHeaderField: HTTPHeader.authorization
)
}
mutating func addValue(_ value: String, forHTTPHeaderField: String) {
restRequest.urlRequest.addValue(
value,
forHTTPHeaderField: forHTTPHeaderField
)
}
func getRequest() -> REST.Request {
restRequest
}
}
struct URLPathTemplate: ExpressibleByStringLiteral {
enum Component {
case literal(String)
case placeholder(String)
}
enum Error: LocalizedError {
/// Replacement value is not provided for placeholder.
case noReplacement(_ name: String)
/// Failure to perecent encode replacement value.
case percentEncoding
var errorDescription: String? {
switch self {
case let .noReplacement(placeholder):
return "Replacement is not provided for \(placeholder)."
case .percentEncoding:
return "Failed to percent encode replacement value."
}
}
}
private var components: [Component]
private var replacements = [String: String]()
init(stringLiteral value: StringLiteralType) {
let slashCharset = CharacterSet(charactersIn: "/")
components = value.split(separator: "/").map { subpath -> Component in
if subpath.hasPrefix("{"), subpath.hasSuffix("}") {
let name = String(subpath.dropFirst().dropLast())
return .placeholder(name)
} else {
return .literal(
subpath.trimmingCharacters(in: slashCharset)
)
}
}
}
private init(components: [Component]) {
self.components = components
}
mutating func addPercentEncodedReplacement(
name: String,
value: String,
allowedCharacters: CharacterSet
) throws {
let encoded = value.addingPercentEncoding(
withAllowedCharacters: allowedCharacters
)
if let encoded {
replacements[name] = encoded
} else {
throw Error.percentEncoding
}
}
var templateString: String {
var combinedString = ""
for component in components {
combinedString += "/"
switch component {
case let .literal(string):
combinedString += string
case let .placeholder(name):
combinedString += "{\(name)}"
}
}
return combinedString
}
func pathString() throws -> String {
var combinedPath = ""
for component in components {
combinedPath += "/"
switch component {
case let .literal(string):
combinedPath += string
case let .placeholder(name):
if let string = replacements[name] {
combinedPath += string
} else {
throw Error.noReplacement(name)
}
}
}
return combinedPath
}
static func + (lhs: URLPathTemplate, rhs: URLPathTemplate) -> URLPathTemplate {
URLPathTemplate(components: lhs.components + rhs.components)
}
}
}
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