285 lines
8.8 KiB
Swift
285 lines
8.8 KiB
Swift
//
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// TwitterFeedProvider.swift
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// FeedProvider
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//
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// Created by Maurice Parker on 4/7/20.
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// Copyright © 2020 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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import Secrets
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import OAuthSwift
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import RSParser
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// TODO: Beef up error handling...
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public enum TwitterFeedProviderError: Error {
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case screenNameNotFound
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case unknown
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}
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public struct TwitterFeedProvider: FeedProvider {
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private static let server = "api.twitter.com"
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private static let apiBase = "https://api.twitter.com/1.1/"
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private static let dateFormat = "EEE MMM dd HH:mm:ss Z yyyy"
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private static let userPaths = ["/home", "/notifications"]
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private static let reservedPaths = ["/search", "/explore", "/messages", "/i", "/compose"]
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public var screenName: String
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private var oauthToken: String
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private var oauthTokenSecret: String
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private var client: OAuthSwiftClient
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public init?(tokenSuccess: OAuthSwift.TokenSuccess) {
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guard let screenName = tokenSuccess.parameters["screen_name"] as? String else {
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return nil
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}
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self.screenName = screenName
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self.oauthToken = tokenSuccess.credential.oauthToken
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self.oauthTokenSecret = tokenSuccess.credential.oauthTokenSecret
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let tokenCredentials = Credentials(type: .oauthAccessToken, username: screenName, secret: oauthToken)
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try? CredentialsManager.storeCredentials(tokenCredentials, server: Self.server)
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let tokenSecretCredentials = Credentials(type: .oauthAccessTokenSecret, username: screenName, secret: oauthTokenSecret)
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try? CredentialsManager.storeCredentials(tokenSecretCredentials, server: Self.server)
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client = OAuthSwiftClient(consumerKey: Secrets.twitterConsumerKey,
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consumerSecret: Secrets.twitterConsumerSecret,
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oauthToken: oauthToken,
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oauthTokenSecret: oauthTokenSecret,
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version: .oauth1)
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}
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public init?(screenName: String) {
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self.screenName = screenName
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guard let tokenCredentials = try? CredentialsManager.retrieveCredentials(type: .oauthAccessToken, server: Self.server, username: screenName),
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let tokenSecretCredentials = try? CredentialsManager.retrieveCredentials(type: .oauthAccessTokenSecret, server: Self.server, username: screenName) else {
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return nil
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}
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self.oauthToken = tokenCredentials.secret
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self.oauthTokenSecret = tokenSecretCredentials.secret
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client = OAuthSwiftClient(consumerKey: Secrets.twitterConsumerKey,
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consumerSecret: Secrets.twitterConsumerSecret,
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oauthToken: oauthToken,
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oauthTokenSecret: oauthTokenSecret,
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version: .oauth1)
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}
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public func ability(_ urlComponents: URLComponents, forUsername username: String?) -> FeedProviderAbility {
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guard urlComponents.host?.hasSuffix("twitter.com") ?? false else {
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return .none
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}
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let bestUserName = username != nil ? username : urlComponents.user
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if bestUserName == screenName {
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return .owner
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}
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return .available
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}
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public func iconURL(_ urlComponents: URLComponents, completion: @escaping (Result<String, Error>) -> Void) {
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if let screenName = deriveScreenName(urlComponents) {
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retrieveUser(screenName: screenName) { result in
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switch result {
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case .success(let user):
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if let avatarURL = user.avatarURL {
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completion(.success(avatarURL))
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} else {
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completion(.failure(TwitterFeedProviderError.screenNameNotFound))
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}
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case .failure(let error):
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completion(.failure(error))
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}
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}
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} else {
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completion(.failure(TwitterFeedProviderError.screenNameNotFound))
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}
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}
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public func assignName(_ urlComponents: URLComponents, completion: @escaping (Result<String, Error>) -> Void) {
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switch urlComponents.path {
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case "/", "/home":
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let name = NSLocalizedString("Twitter Timeline", comment: "Twitter Timeline")
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completion(.success(name))
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case "/notifications/mentions":
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let name = NSLocalizedString("Twitter Mentions", comment: "Twitter Mentions")
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completion(.success(name))
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case "/search":
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if let query = urlComponents.queryItems?.first(where: { $0.name == "q" })?.value {
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let localized = NSLocalizedString("Twitter Search: %@", comment: "Twitter Search")
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let searchName = NSString.localizedStringWithFormat(localized as NSString, query) as String
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completion(.success(searchName))
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} else {
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let name = NSLocalizedString("Twitter Search", comment: "Twitter Search")
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completion(.success(name))
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}
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default:
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if let screenName = deriveScreenName(urlComponents) {
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retrieveUser(screenName: screenName) { result in
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switch result {
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case .success(let user):
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if let userName = user.name {
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completion(.success(userName))
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} else {
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completion(.failure(TwitterFeedProviderError.screenNameNotFound))
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}
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case .failure(let error):
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completion(.failure(error))
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}
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}
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} else {
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completion(.failure(TwitterFeedProviderError.unknown))
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}
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}
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}
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public func refresh(_ webFeed: WebFeed, completion: @escaping (Result<Set<ParsedItem>, Error>) -> Void) {
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let api = "statuses/home_timeline.json"
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retrieveTweets(api: api) { result in
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switch result {
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case .success(let tweets):
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let parsedItems = self.makeParsedItems(webFeed.url, tweets)
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completion(.success(parsedItems))
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case .failure(let error):
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completion(.failure(error))
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}
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}
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}
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}
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// MARK: OAuth1SwiftProvider
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extension TwitterFeedProvider: OAuth1SwiftProvider {
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public static var oauth1Swift: OAuth1Swift {
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return OAuth1Swift(
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consumerKey: Secrets.twitterConsumerKey,
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consumerSecret: Secrets.twitterConsumerSecret,
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requestTokenUrl: "https://api.twitter.com/oauth/request_token",
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authorizeUrl: "https://api.twitter.com/oauth/authorize",
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accessTokenUrl: "https://api.twitter.com/oauth/access_token"
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)
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}
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}
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// MARK: Private
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private extension TwitterFeedProvider {
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func deriveScreenName(_ urlComponents: URLComponents) -> String? {
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let path = urlComponents.path
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guard !Self.reservedPaths.contains(path) else { return nil }
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if path.isEmpty || Self.userPaths.contains(path) {
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return screenName
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} else {
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return String(path.suffix(from: path.index(path.startIndex, offsetBy: 1)))
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}
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}
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func retrieveUser(screenName: String, completion: @escaping (Result<TwitterUser, Error>) -> Void) {
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let url = "\(Self.apiBase)users/show.json"
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let parameters = ["screen_name": screenName]
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client.get(url, parameters: parameters) { result in
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switch result {
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case .success(let response):
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let decoder = JSONDecoder()
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do {
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let user = try decoder.decode(TwitterUser.self, from: response.data)
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completion(.success(user))
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} catch {
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completion(.failure(error))
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}
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case .failure(let error):
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completion(.failure(error))
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}
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}
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}
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func retrieveTweets(api: String, completion: @escaping (Result<[TwitterStatus], Error>) -> Void) {
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let url = "\(Self.apiBase)\(api)"
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let parameters = ["tweet_mode": "extended"]
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client.get(url, parameters: parameters) { result in
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switch result {
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case .success(let response):
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let decoder = JSONDecoder()
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let dateFormatter = DateFormatter()
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dateFormatter.dateFormat = Self.dateFormat
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decoder.dateDecodingStrategy = .formatted(dateFormatter)
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let jsonString = String(data: response.data, encoding: .utf8)
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let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!.appendingPathComponent("twitter.json")
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print("******** writing to: \(url.path)")
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try? jsonString?.write(toFile: url.path, atomically: true, encoding: .utf8)
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do {
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let tweets = try decoder.decode([TwitterStatus].self, from: response.data)
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completion(.success(tweets))
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} catch {
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completion(.failure(error))
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}
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case .failure(let error):
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completion(.failure(error))
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}
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}
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}
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func makeParsedItems(_ webFeedURL: String, _ statuses: [TwitterStatus]) -> Set<ParsedItem> {
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var parsedItems = Set<ParsedItem>()
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for status in statuses {
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guard let idStr = status.idStr, let statusURL = status.url else { continue }
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let parsedItem = ParsedItem(syncServiceID: idStr,
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uniqueID: idStr,
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feedURL: webFeedURL,
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url: statusURL,
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externalURL: nil,
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title: nil,
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language: nil,
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contentHTML: status.renderAsHTML(),
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contentText: status.renderAsText(),
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summary: nil,
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imageURL: nil,
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bannerImageURL: nil,
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datePublished: status.createdAt,
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dateModified: nil,
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authors: makeParsedAuthors(status.user),
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tags: nil,
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attachments: nil)
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parsedItems.insert(parsedItem)
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}
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return parsedItems
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}
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func makeUserURL(_ screenName: String) -> String {
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return "https://twitter.com/\(screenName)"
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}
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func makeParsedAuthors(_ user: TwitterUser?) -> Set<ParsedAuthor>? {
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guard let user = user else { return nil }
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return Set([ParsedAuthor(name: user.name, url: user.url, avatarURL: user.avatarURL, emailAddress: nil)])
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}
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}
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