nip42: add initial relay auth support

Lightning-Invoice: lnbc1pjcpaakpp5gjs4f626hf8w6slx84xz3wwhlf309z503rjutckdxv6wwg5ldavsdqqcqzpgxqrrs0fppqjaxxw43p7em4g59vedv7pzl76kt0qyjfsp5qcp9de7a7t8h6zs5mcssfaqp4exrnkehqtg2hf0ary3z5cjnasvs9qyyssq55523e4h3cazhkv7f8jqf5qp0n8spykls49crsu5t3m636u3yj4qdqjkdl2nxf6jet5t2r2pfrxmm8rjpqjd3ylrzqq89m4gqt5l6ycqf92c7h
Closes: https://github.com/damus-io/damus/issues/940
Signed-off-by: Charlie Fish <contact@charlie.fish>
Signed-off-by: William Casarin <jb55@jb55.com>
Changelog-Added: Add NIP-42 relay auth support

damusTests/Util/NdbExtensions.swift

@@ -0,0 +1,26 @@
+//
+//  NdbExtensions.swift
+//  damusTests
+//
+//  Created by Charlie Fish on 12/23/23.
+//
+
+import Foundation
+@testable import damus
+
+extension Ndb {
+    static var test: Ndb {
+        var tempDir: String!
+        do {
+            let fileManager = FileManager.default
+            let temp = fileManager.temporaryDirectory.appendingPathComponent(UUID().uuidString)
+            try fileManager.createDirectory(at: temp, withIntermediateDirectories: true, attributes: nil)
+            tempDir = temp.absoluteString
+        } catch {
+            tempDir = "."
+        }
+
+        print("opening \(tempDir!)")
+        return Ndb(path: tempDir)!
+    }
+}