NetNewsWire/Evergreen/Images/RSHTMLMetadata+Extension.swift

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2017-11-27 04:57:45 +01:00
//
// RSHTMLMetadata+Extension.swift
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// Evergreen
//
// Created by Brent Simmons on 11/26/17.
// Copyright © 2017 Ranchero Software. All rights reserved.
//
import Foundation
import RSParser
extension RSHTMLMetadata {
func largestOpenGraphImageURL() -> String? {
guard let openGraphImages = openGraphProperties?.images, !openGraphImages.isEmpty else {
return nil
}
var bestImage: RSHTMLOpenGraphImage? = nil
for image in openGraphImages {
if bestImage == nil {
bestImage = image
continue
}
if image.height > bestImage!.height && image.width > bestImage!.width {
bestImage = image
}
}
guard let url = bestImage?.secureURL ?? bestImage?.url else {
return nil
}
// Bad ones we should ignore.
let badURLs = Set(["https://s0.wp.com/i/blank.jpg"])
guard !badURLs.contains(url) else {
return nil
}
return url
}
func largestAppleTouchIcon() -> String? {
guard let icons = appleTouchIcons, !icons.isEmpty else {
return nil
}
var bestImage: RSHTMLMetadataAppleTouchIcon? = nil
for image in icons {
if bestImage == nil {
bestImage = image
continue
}
if image.size.height > bestImage!.size.height && image.size.width > bestImage!.size.width {
bestImage = image;
}
}
return bestImage?.urlString
}
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func bestWebsiteIconURL() -> String? {
// TODO: metadata icons sometimes theyre large enough to use here.
if let appleTouchIcon = largestAppleTouchIcon() {
return appleTouchIcon
}
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if let openGraphImageURL = largestOpenGraphImageURL() {
return openGraphImageURL
}
return twitterProperties.imageURL
}
func bestFeaturedImageURL() -> String? {
if let openGraphImageURL = largestOpenGraphImageURL() {
return openGraphImageURL
}
return twitterProperties.imageURL
}
}