hechen · August 4, 2020 03:32 · Aug 4, 2020
diff --git a/YoutubeID Parser b/YoutubeID Parser
@@ -0,0 +1,55 @@
+//
+//  YTBParser.swift
+//  SideloadExt
+//
+//  Created by chen he on 2020/7/30.
+//  Copyright © 2020 chen he. All rights reserved.
+//
+
+import Foundation
+
+struct YTBParser {
+    static func videoID(fromVideoURL videoURL: URL) -> String? {
+        if videoURL.host == "youtu.be" {
+             return videoURL.pathComponents.second
+        } else if videoURL.absoluteString.contains("www.youtube.com/embed") {
+            return videoURL.pathComponents.third
+        } else if videoURL.host?.contains("youtube.googleapis.com") == true || videoURL.pathComponents.first == "www.youtube.com" {
+            return videoURL.pathComponents.third
+        } else {
+            return videoURL.extractedParamsFromQuery["v"]?.first
+        }
+    }
+}
+
+extension Array {
+    var second: Element? {
+        return count >= 2 ? self[1] : nil
+    }
+    var third: Element? {
+        return count >= 3 ? self[2] : nil
+    }
+}
+extension URL {
+    var extractedParamsFromQuery: [AnyHashable: [String]] {
+        return query?.dictionaryFromQueryStringComponents() ?? [:]
+    }
+}
+extension String {
+    func stringBydecodingURLFormat() -> String? {
+        return replacingOccurrences(of: "+", with: " ").removingPercentEncoding
+    }
+
+    func dictionaryFromQueryStringComponents() -> [String: [String]] {        
+        var params: [String: [String]] = [:]
+        for key in components(separatedBy: "&") {
+            let keyValue = key.components(separatedBy: "=")
+            if let key = keyValue.first, let value = keyValue.second {
+                var values = params[key] ?? []
+                values.append(value)
+                params[key] = values
+            }
+        }
+        return params
+    }
+}