90 lines
1.8 KiB
Swift
90 lines
1.8 KiB
Swift
//
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// RSHTMLMetadata+Extension.swift
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// Evergreen
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//
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// Created by Brent Simmons on 11/26/17.
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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 RSParser
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extension RSHTMLMetadata {
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func largestOpenGraphImageURL() -> String? {
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guard let openGraphImages = openGraphProperties?.images, !openGraphImages.isEmpty else {
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return nil
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}
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var bestImage: RSHTMLOpenGraphImage? = nil
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for image in openGraphImages {
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if bestImage == nil {
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bestImage = image
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continue
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}
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if image.height > bestImage!.height && image.width > bestImage!.width {
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bestImage = image
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}
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}
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guard let url = bestImage?.secureURL ?? bestImage?.url else {
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return nil
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}
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// Bad ones we should ignore.
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let badURLs = Set(["https://s0.wp.com/i/blank.jpg"])
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guard !badURLs.contains(url) else {
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return nil
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}
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return url
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}
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func largestAppleTouchIcon() -> String? {
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guard let icons = appleTouchIcons, !icons.isEmpty else {
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return nil
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}
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var bestImage: RSHTMLMetadataAppleTouchIcon? = nil
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for image in icons {
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if bestImage == nil {
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bestImage = image
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continue
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}
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if image.size.height > bestImage!.size.height && image.size.width > bestImage!.size.width {
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bestImage = image;
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}
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}
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return bestImage?.urlString
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}
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func bestWebsiteIconURL() -> String? {
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// TODO: metadata icons — sometimes they’re large enough to use here.
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if let appleTouchIcon = largestAppleTouchIcon() {
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return appleTouchIcon
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}
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if let openGraphImageURL = largestOpenGraphImageURL() {
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return openGraphImageURL
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}
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return twitterProperties.imageURL
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}
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func bestFeaturedImageURL() -> String? {
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if let openGraphImageURL = largestOpenGraphImageURL() {
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return openGraphImageURL
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}
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return twitterProperties.imageURL
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}
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}
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