NetNewsWire/Shared/HTMLMetadata/HTMLMetadataDownloader.swift

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//
// HTMLMetadataDownloader.swift
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// NetNewsWire
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//
// Created by Brent Simmons on 11/26/17.
// Copyright © 2017 Ranchero Software. All rights reserved.
//
import Foundation
import RSWeb
import RSParser
struct HTMLMetadataDownloader {
static let serialDispatchQueue = DispatchQueue(label: "HTMLMetadataDownloader")
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static func downloadMetadata(for url: String, _ callback: @escaping (RSHTMLMetadata?) -> Void) {
guard let actualURL = URL(string: url) else {
callback(nil)
return
}
downloadUsingCache(actualURL) { (data, response, error) in
if let data = data, !data.isEmpty, let response = response, response.statusIsOK, error == nil {
let urlToUse = response.url ?? actualURL
let parserData = ParserData(url: urlToUse.absoluteString, data: data)
parseMetadata(with: parserData, callback)
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return
}
if let error = error {
appDelegate.logMessage("Error downloading metadata at \(url): \(error)", type: .warning)
}
callback(nil)
}
}
private static func parseMetadata(with parserData: ParserData, _ callback: @escaping (RSHTMLMetadata?) -> Void) {
serialDispatchQueue.async {
let htmlMetadata = RSHTMLMetadataParser.htmlMetadata(with: parserData)
DispatchQueue.main.async {
callback(htmlMetadata)
}
}
}
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}