Handle njump me links

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Added support for opening njump.me content in Nos.
+- Fixed a crash on logout
 - Fixed a bug where some profiles wouldn't load old notes.
 - Fixed an issue where NIP-05 could appear as invalid.
 

Nos/Service/DeepLinkService.swift

@@ -1,26 +1,65 @@
 import Foundation
 import Logger
+import Dependencies
 
 enum DeepLinkService {
 
-    static let nosURLScheme = "nos"
+    /// Returns the URL scheme for Nos, which varies by build (dev, staging, production). 
+    static var nosURLScheme: String? = { 
+        if let urlTypes = Bundle.main.infoDictionary?["CFBundleURLTypes"] as? [[String: Any]] {
+            for urlTypeDictionary in urlTypes {
+                guard let urlSchemes = urlTypeDictionary["CFBundleURLSchemes"] as? [String] else { continue }
+                guard let externalURLScheme = urlSchemes.first else { continue }
+                return externalURLScheme
+            }
+        }
+
+        return nil
+    }()
 
     @MainActor static func handle(_ url: URL, router: Router) {
+        @Dependency(\.persistenceController) var persistenceController
+        @Dependency(\.router) var router
         Log.info("handling link \(url.absoluteString)")
 
         let components = URLComponents(url: url, resolvingAgainstBaseURL: true)
 
-        guard let components else {
+        guard let components, let nosURLScheme, components.scheme == nosURLScheme else {
             return
         }
 
-        if components.scheme == nosURLScheme, components.host == "note", components.path == "/new" {
+        if components.host == "note", components.path == "/new" {
             let noteContents = components
                 .queryItems?
                 .first(where: { $0.name == "contents" })?
                 .value
 
             router.showNewNoteView(contents: noteContents)
+        } else {
+            /// Check for links like nos:nevent123174
+            let firstPathComponent = components.path
+            // swiftlint:disable:next opening_brace 
+            let unformattedRegex = /(?:nostr:)?(?<entity>((npub1|note1|nprofile1|nevent1)[a-zA-Z0-9]{58,255}))/
+            do {
+                if let match = try unformattedRegex.firstMatch(in: firstPathComponent) {
+                    let entity = match.1
+                    let string = String(entity)
+
+                    let (humanReadablePart, checksum) = try Bech32.decode(string)
+
+                    if humanReadablePart == Nostr.publicKeyPrefix, let hex = SHA256Key.decode(base5: checksum) {
+                        router.push(try Author.findOrCreate(by: hex, context: persistenceController.viewContext))
+                    } else if humanReadablePart == Nostr.notePrefix, let hex = SHA256Key.decode(base5: checksum) {
+                        router.push(try Event.findOrCreateStubBy(id: hex, context: persistenceController.viewContext))
+                    } else if humanReadablePart == Nostr.profilePrefix, let hex = TLV.decode(checksum: checksum) {
+                        router.push(try Author.findOrCreate(by: hex, context: persistenceController.viewContext))
+                    } else if humanReadablePart == Nostr.eventPrefix, let hex = TLV.decode(checksum: checksum) {
+                        router.push(try Event.findOrCreateStubBy(id: hex, context: persistenceController.viewContext))
+                    } 
+                }
+            } catch {
+                Log.optional(error)
+            }
         }
     }
 }