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submodules/PresentationDataUtils/Sources/OpenUrl.swift

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+import Foundation
+import Display
+import SwiftSignalKit
+import AccountContext
+import OverlayStatusController
+import UrlWhitelist
+
+public func openUserGeneratedUrl(context: AccountContext, url: String, concealed: Bool, present: @escaping (ViewController) -> Void, openResolved: @escaping (ResolvedUrl) -> Void) {
+    var concealed = concealed
+    
+    let presentationData = context.sharedContext.currentPresentationData.with { $0 }
+    
+    let openImpl: () -> Void = {
+        let disposable = MetaDisposable()
+        var cancelImpl: (() -> Void)?
+        let progressSignal = Signal<Never, NoError> { subscriber in
+            let controller = OverlayStatusController(theme: presentationData.theme,  type: .loading(cancelled: {
+                cancelImpl?()
+            }))
+            present(controller)
+            return ActionDisposable { [weak controller] in
+                Queue.mainQueue().async() {
+                    controller?.dismiss()
+                }
+            }
+        }
+        |> runOn(Queue.mainQueue())
+        |> delay(0.15, queue: Queue.mainQueue())
+        let progressDisposable = progressSignal.start()
+        
+        cancelImpl = {
+            disposable.dispose()
+        }
+        disposable.set((context.sharedContext.resolveUrl(account: context.account, url: url)
+        |> afterDisposed {
+            Queue.mainQueue().async {
+                progressDisposable.dispose()
+            }
+        }
+        |> deliverOnMainQueue).start(next: { result in
+            openResolved(result)
+        }))
+    }
+    
+    let (parsedString, parsedConcealed) = parseUrl(url: url, wasConcealed: concealed)
+    concealed = parsedConcealed
+    
+    if concealed {
+        var rawDisplayUrl: String = parsedString
+        let maxLength = 180
+        if rawDisplayUrl.count > maxLength {
+            rawDisplayUrl = String(rawDisplayUrl[..<rawDisplayUrl.index(rawDisplayUrl.startIndex, offsetBy: maxLength - 2)]) + "..."
+        }
+        var displayUrl = rawDisplayUrl
+        displayUrl = displayUrl.replacingOccurrences(of: "\u{202e}", with: "")
+        present(textAlertController(context: context, title: nil, text: presentationData.strings.Generic_OpenHiddenLinkAlert(displayUrl).0, actions: [TextAlertAction(type: .genericAction, title: presentationData.strings.Common_No, action: {}), TextAlertAction(type: .defaultAction, title: presentationData.strings.Common_Yes, action: {
+            openImpl()
+        })]))
+    } else {
+        openImpl()
+    }
+}