123 lines
2.6 KiB
Swift
123 lines
2.6 KiB
Swift
//
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// ArticleExtractor.swift
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// NetNewsWire
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//
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// Created by Maurice Parker on 9/18/19.
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// Copyright © 2019 Ranchero Software. All rights reserved.
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//
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import Foundation
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import FoundationExtras
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public enum ArticleExtractorState {
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case ready
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case processing
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case failedToParse
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case complete
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case cancelled
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}
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protocol ArticleExtractorDelegate {
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@MainActor func articleExtractionDidFail(with: Error)
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@MainActor func articleExtractionDidComplete(extractedArticle: ExtractedArticle)
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}
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@MainActor final class ArticleExtractor {
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private var dataTask: URLSessionDataTask? = nil
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var state: ArticleExtractorState!
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var article: ExtractedArticle?
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var delegate: ArticleExtractorDelegate?
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let articleLink: String?
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private let url: URL!
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public init?(_ articleLink: String, clientID: String, clientSecret: String) {
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self.articleLink = articleLink
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let clientURL = "https://extract.feedbin.com/parser"
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let username = clientID
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let signature = articleLink.hmacUsingSHA1(key: clientSecret)
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if let base64URL = articleLink.data(using: .utf8)?.base64EncodedString() {
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let fullURL = "\(clientURL)/\(username)/\(signature)?base64_url=\(base64URL)"
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if let url = URL(string: fullURL) {
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self.url = url
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return
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}
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}
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return nil
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}
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public func process() {
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state = .processing
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dataTask = URLSession.shared.dataTask(with: url) { [weak self] data, response, error in
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Task { @MainActor [weak self] in
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guard let self else {
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return
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}
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if let error {
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self.noteDidFail(error: error)
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return
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}
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guard let data else {
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self.noteDidFail(error: URLError(.cannotDecodeContentData))
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return
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}
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do {
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let article = try decodeArticle(data: data)
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self.article = article
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if article.content == nil {
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self.noteDidFail(error: URLError(.cannotDecodeContentData))
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} else {
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self.noteDidComplete(article: article)
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}
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} catch {
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self.noteDidFail(error: error)
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}
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}
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}
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dataTask!.resume()
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}
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public func cancel() {
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state = .cancelled
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dataTask?.cancel()
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}
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}
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private extension ArticleExtractor {
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func decodeArticle(data: Data) throws -> ExtractedArticle {
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let decoder = JSONDecoder()
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decoder.dateDecodingStrategy = .iso8601
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let article = try decoder.decode(ExtractedArticle.self, from: data)
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return article
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}
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func noteDidFail(error: Error) {
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state = .failedToParse
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delegate?.articleExtractionDidFail(with: error)
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}
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func noteDidComplete(article: ExtractedArticle) {
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state = .complete
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delegate?.articleExtractionDidComplete(extractedArticle: article)
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}
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}
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