72 lines
2.0 KiB
Swift
72 lines
2.0 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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// The favicon URLs may be specified in the head section of the home page.
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struct FaviconURLFinder {
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private static var ignoredMimeTypes = [String]()
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private static var ignoredExtensions = [String]()
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/// Uniform types to ignore when finding favicon URLs.
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static var ignoredTypes: [String]? {
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didSet {
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guard let ignoredTypes = ignoredTypes else {
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return
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}
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for type in ignoredTypes {
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if let mimeTypes = UTTypeCopyAllTagsWithClass(type as CFString, kUTTagClassMIMEType)?.takeRetainedValue() {
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ignoredMimeTypes.append(contentsOf: mimeTypes as! [String])
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}
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if let extensions = UTTypeCopyAllTagsWithClass(type as CFString, kUTTagClassFilenameExtension)?.takeRetainedValue() {
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ignoredExtensions.append(contentsOf: extensions as! [String])
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}
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}
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}
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}
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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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if let type = favicon.type {
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if ignoredMimeTypes.contains(type) {
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return nil
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}
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}
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else {
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if let urlString = favicon.urlString, let url = URL(string: urlString), ignoredExtensions.contains(url.pathExtension) {
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return nil
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}
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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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}
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