Major folder and project tree restructuring.

Shared/HTMLMetadata/HTMLMetadataDownloader.swift

@@ -0,0 +1,47 @@
+//
+//  HTMLMetadataDownloader.swift
+//  NetNewsWire
+//
+//  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")
+
+	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)
+				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)
+			}
+		}
+	}
+}