Use Feed Finder before attempting to add feed urls

Frameworks/Account/ReaderAPI/ReaderAPICaller.swift

@@ -321,6 +321,20 @@ final class ReaderAPICaller: NSObject {
 			return
 		}
 		
+		guard let url = URL(string: url) else {
+			completion(.failure(LocalAccountDelegateError.invalidParameter))
+			return
+		}
+		
+		FeedFinder.find(url: url) { result in
+			
+			switch result {
+			case .success(let feedSpecifiers):
+				guard let bestFeedSpecifier = FeedSpecifier.bestFeed(in: feedSpecifiers),
+					let url = URL(string: bestFeedSpecifier.urlString) else {
+						completion(.failure(AccountError.createErrorNotFound))
+						return
+				}
 				self.requestAuthorizationToken(endpoint: baseURL) { (result) in
 					switch result {
 					case .success(let token):
@@ -330,7 +344,7 @@ final class ReaderAPICaller: NSObject {
 						}
 		
 						components.queryItems = [
-					URLQueryItem(name: "quickadd", value: url)
+							URLQueryItem(name: "quickadd", value: url.absoluteString)
 						]
 		
 						guard let callURL = components.url else {
@@ -394,6 +408,15 @@ final class ReaderAPICaller: NSObject {
 						completion(.failure(error))
 					}
 				}
+				
+				
+				
+			case .failure:
+				completion(.failure(AccountError.createErrorNotFound))
+			}
+			
+		}
+//
 	}
 	
 	func renameSubscription(subscriptionID: String, newName: String, completion: @escaping (Result<Void, Error>) -> Void) {