67 lines
1.8 KiB
Swift
67 lines
1.8 KiB
Swift
//
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// SeekingFavicon.swift
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// Evergreen
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//
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// Created by Brent Simmons on 11/23/17.
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// Copyright © 2017 Ranchero Software. All rights reserved.
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//
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import Foundation
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extension Notification.Name {
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static let SeekingFaviconDidFindFaviconURL = Notification.Name("SeekingFaviconDidFindFaviconURLNotification")
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static let SeekingFaviconDidNotFindFaviconURL = Notification.Name("SeekingFaviconDidNotFindFaviconURLNotification")
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}
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final class SeekingFavicon {
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// At first, when looking for a favicon, we only know the homePageURL.
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// The faviconURL may be specified by metadata in the home page,
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// or it might be at /favicon.ico,
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// or it might not exist (or be unfindable, which is the same thing).
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let homePageURL: String
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let defaultFaviconURL: String // /favicon.ico
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var didAttemptToLookAtHomePageMetadata = false
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var foundFaviconURL: String?
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var shouldUseDefaultFaviconURL: Bool {
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return didAttemptToLookAtHomePageMetadata && foundFaviconURL == nil
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}
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private static let localeForLowercasing = Locale(identifier: "en_US")
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init?(homePageURL: String) {
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guard let url = URL(string: homePageURL), let scheme = url.scheme, let host = url.host else {
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return nil
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}
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self.homePageURL = homePageURL
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self.defaultFaviconURL = "\(scheme)://\(host)/favicon.ico".lowercased(with: SeekingFavicon.localeForLowercasing)
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findFaviconURL()
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}
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}
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private extension SeekingFavicon {
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func findFaviconURL() {
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FaviconURLFinder.findFaviconURL(homePageURL) { (faviconURL) in
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self.didAttemptToLookAtHomePageMetadata = true
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self.foundFaviconURL = faviconURL
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if let _ = faviconURL {
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NotificationCenter.default.post(name: .SeekingFaviconDidFindFaviconURL, object: self)
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}
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else {
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NotificationCenter.default.post(name: .SeekingFaviconDidNotFindFaviconURL, object: self)
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}
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}
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}
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}
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