67 lines
1.7 KiB
Swift
67 lines
1.7 KiB
Swift
//
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// FaviconURLFinder.swift
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// NetNewsWire
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//
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// Created by Brent Simmons on 11/20/17.
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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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import CoreServices
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import RSParser
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import UniformTypeIdentifiers
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// The favicon URLs may be specified in the head section of the home page.
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struct FaviconURLFinder {
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/// Uniform types to ignore when finding favicon URLs.
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static var ignoredTypes = [UTType.svg]
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/// Finds favicon URLs in a web page.
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/// - Parameters:
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/// - homePageURL: The page to search.
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/// - completion: A closure called when the links have been found.
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/// - urls: An array of favicon URLs as strings.
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static func findFaviconURLs(with homePageURL: String, _ completion: @escaping (_ urls: [String]?) -> Void) {
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guard let _ = URL(unicodeString: homePageURL) else {
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completion(nil)
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return
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}
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// If the favicon has an explicit type, check that for an ignored type; otherwise, check the file extension.
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HTMLMetadataDownloader.downloadMetadata(for: homePageURL) { htmlMetadata in
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let faviconURLs = htmlMetadata?.favicons.compactMap { favicon -> String? in
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guard shouldAllowFavicon(favicon) else {
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return nil
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}
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return favicon.urlString
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}
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completion(faviconURLs)
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}
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}
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static func shouldAllowFavicon(_ favicon: RSHTMLMetadataFavicon) -> Bool {
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// Check mime type.
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if let mimeType = favicon.type, let utType = UTType(mimeType: mimeType) {
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if ignoredTypes.contains(utType) {
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return false
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}
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}
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// Check file extension.
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if let urlString = favicon.urlString, let url = URL(string: urlString), let utType = UTType(filenameExtension: url.pathExtension) {
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if ignoredTypes.contains(utType) {
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return false
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}
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}
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return true
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}
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}
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