feat(georelay): fetch daily from remote CSV with fallback to bundled; cache to app support; prefetch on app load

bitchat.xcodeproj/project.pbxproj

@@ -64,10 +64,6 @@
 		3849CA6D99B2D536636DF4A6 /* MockBLEService.swift in Sources */ = {isa = PBXBuildFile; fileRef = FE7CCF2BD78A3F3DAE6DA145 /* MockBLEService.swift */; };
 		38EDDC049FD56B1BB1F14C91 /* IdentityModels.swift in Sources */ = {isa = PBXBuildFile; fileRef = 05BA20BC0F123F1507C5C247 /* IdentityModels.swift */; };
 		3EE336D150427F736F32B56C /* P256K in Frameworks */ = {isa = PBXBuildFile; productRef = B1D9136AA0083366353BFA2F /* P256K */; };
-		E0A1B2C3D4E5F6012345678B /* GeoRelayDirectory.swift in Sources */ = {isa = PBXBuildFile; fileRef = E0A1B2C3D4E5F60123456789 /* GeoRelayDirectory.swift */; };
-		E0A1B2C3D4E5F6012345678C /* GeoRelayDirectory.swift in Sources */ = {isa = PBXBuildFile; fileRef = E0A1B2C3D4E5F60123456789 /* GeoRelayDirectory.swift */; };
-		E0A1B2C3D4E5F6012345678D /* online_relays_gps.csv in Resources */ = {isa = PBXBuildFile; fileRef = E0A1B2C3D4E5F6012345678A /* online_relays_gps.csv */; };
-		E0A1B2C3D4E5F6012345678E /* online_relays_gps.csv in Resources */ = {isa = PBXBuildFile; fileRef = E0A1B2C3D4E5F6012345678A /* online_relays_gps.csv */; };
 		4B747085D07A1BCE0F5BA612 /* BinaryProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = A2136C3E22D02D4A8DBE7EAB /* BinaryProtocol.swift */; };
 		501BC56B1A08C0327A09AAF1 /* NoiseEncryptionService.swift in Sources */ = {isa = PBXBuildFile; fileRef = 394E8A1AC76EFAE352075BE9 /* NoiseEncryptionService.swift */; };
 		5C93B4FDD0C448C3EDDBF8AE /* FavoritesPersistenceService.swift in Sources */ = {isa = PBXBuildFile; fileRef = 419BFFF209EBA93F410E9E9F /* FavoritesPersistenceService.swift */; };
@@ -130,6 +126,10 @@
 		D691938B4029A04CC905FDC8 /* NoiseSecurityConsiderations.swift in Sources */ = {isa = PBXBuildFile; fileRef = 43B4548DAFC9F7AA8873DA53 /* NoiseSecurityConsiderations.swift */; };
 		D727EA273CB214FC32612469 /* MockBluetoothMeshService.swift in Sources */ = {isa = PBXBuildFile; fileRef = C27328EE574221395B2B8E87 /* MockBluetoothMeshService.swift */; };
 		D782AB596DDB5C846554F7C3 /* NostrIdentity.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5F8043995007F0D84438EDD9 /* NostrIdentity.swift */; };
+		E0A1B2C3D4E5F6012345678B /* GeoRelayDirectory.swift in Sources */ = {isa = PBXBuildFile; fileRef = E0A1B2C3D4E5F60123456789 /* GeoRelayDirectory.swift */; };
+		E0A1B2C3D4E5F6012345678C /* GeoRelayDirectory.swift in Sources */ = {isa = PBXBuildFile; fileRef = E0A1B2C3D4E5F60123456789 /* GeoRelayDirectory.swift */; };
+		E0A1B2C3D4E5F6012345678D /* relays/online_relays_gps.csv in Resources */ = {isa = PBXBuildFile; fileRef = E0A1B2C3D4E5F6012345678A /* relays/online_relays_gps.csv */; };
+		E0A1B2C3D4E5F6012345678E /* relays/online_relays_gps.csv in Resources */ = {isa = PBXBuildFile; fileRef = E0A1B2C3D4E5F6012345678A /* relays/online_relays_gps.csv */; };
 		E2DCF7817344F1CCDB8B7B2F /* SecureIdentityStateManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = FDC18D910D6FF2E8B1B6C885 /* SecureIdentityStateManager.swift */; };
 		E65BBB6544FE0159F3C6C3A8 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 95F16C3A4A5621C74461D8D3 /* LaunchScreen.storyboard */; };
 		EC5241969D2550B97629EBD0 /* SecureLogger.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE7EFB209C86BBD956B749EC /* SecureLogger.swift */; };
@@ -225,8 +225,6 @@
 		5318B743C64628A125261163 /* BinaryEncodingUtils.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BinaryEncodingUtils.swift; sourceTree = "<group>"; };
 		5BC5AB43F4A8FB62C935CD74 /* IntegrationTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = IntegrationTests.swift; sourceTree = "<group>"; };
 		5F8043995007F0D84438EDD9 /* NostrIdentity.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NostrIdentity.swift; sourceTree = "<group>"; };
-        E0A1B2C3D4E5F60123456789 /* GeoRelayDirectory.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GeoRelayDirectory.swift; sourceTree = "<group>"; };
-        E0A1B2C3D4E5F6012345678A /* online_relays_gps.csv */ = {isa = PBXFileReference; lastKnownFileType = text; path = relays/online_relays_gps.csv; sourceTree = "<group>"; };
 		61F92EBA29C47C0FCC482F1F /* bitchatShareExtension.appex */ = {isa = PBXFileReference; explicitFileType = "wrapper.app-extension"; includeInIndex = 0; path = bitchatShareExtension.appex; sourceTree = BUILT_PRODUCTS_DIR; };
 		763E0DBA9492A654FC0CDCB9 /* AppInfoView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppInfoView.swift; sourceTree = "<group>"; };
 		78595178957244CBDF7E79B6 /* NostrRelayManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NostrRelayManager.swift; sourceTree = "<group>"; };
@@ -249,6 +247,8 @@
 		C27328EE574221395B2B8E87 /* MockBluetoothMeshService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MockBluetoothMeshService.swift; sourceTree = "<group>"; };
 		D22BF09A49010947CEFE45E2 /* PublicChatE2ETests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PublicChatE2ETests.swift; sourceTree = "<group>"; };
 		D69A18D27F9A565FD6041E12 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		E0A1B2C3D4E5F60123456789 /* GeoRelayDirectory.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GeoRelayDirectory.swift; sourceTree = "<group>"; };
+		E0A1B2C3D4E5F6012345678A /* relays/online_relays_gps.csv */ = {isa = PBXFileReference; lastKnownFileType = text; path = relays/online_relays_gps.csv; sourceTree = "<group>"; };
 		E6B8F7B7D55092C2540A7996 /* ChatViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ChatViewModel.swift; sourceTree = "<group>"; };
 		E95DBE6A48626C5AE287245E /* NoiseProtocolTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NoiseProtocolTests.swift; sourceTree = "<group>"; };
 		EA706D8E5097785414646A8E /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist; path = Info.plist; sourceTree = "<group>"; };
@@ -308,7 +308,7 @@
 			isa = PBXGroup;
 			children = (
 				2F82C5FC8433F4064F079D1F /* bitchat */,
-				E0A1B2C3D4E5F6012345678A /* online_relays_gps.csv */,
+				E0A1B2C3D4E5F6012345678A /* relays/online_relays_gps.csv */,
 				A2E8C336FA1ADBEC03261DFD /* bitchatShareExtension */,
 				C3D98EB3E1B455E321F519F4 /* bitchatTests */,
 				9F37F9F2C353B58AC809E93B /* Products */,
@@ -328,8 +328,8 @@
 			isa = PBXGroup;
 			children = (
 				3A69677D382F1C3D5ED03F7D /* Assets.xcassets */,
-				FF7AF93D874001FBD94C8306 /* bitchat-macOS.entitlements */,
 				527EB217EFDFAD4CF1C91F07 /* bitchat.entitlements */,
+				FF7AF93D874001FBD94C8306 /* bitchat-macOS.entitlements */,
 				EF625BB3AD919322C01A46B2 /* BitchatApp.swift */,
 				EA706D8E5097785414646A8E /* Info.plist */,
 				95F16C3A4A5621C74461D8D3 /* LaunchScreen.storyboard */,
@@ -691,7 +691,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				7DD72D928FF9DD3CA81B46B0 /* Assets.xcassets in Resources */,
-                E0A1B2C3D4E5F6012345678D /* online_relays_gps.csv in Resources */,
+				E0A1B2C3D4E5F6012345678D /* relays/online_relays_gps.csv in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -701,7 +701,7 @@
 			files = (
 				BCCFEDC1EBE59323C3C470BF /* Assets.xcassets in Resources */,
 				E65BBB6544FE0159F3C6C3A8 /* LaunchScreen.storyboard in Resources */,
-                E0A1B2C3D4E5F6012345678E /* online_relays_gps.csv in Resources */,
+				E0A1B2C3D4E5F6012345678E /* relays/online_relays_gps.csv in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

bitchat/BitchatApp.swift

@@ -21,6 +21,8 @@ struct BitchatApp: App {
     
     init() {
         UNUserNotificationCenter.current().delegate = NotificationDelegate.shared
+        // Warm up georelay directory and refresh if stale (once/day)
+        GeoRelayDirectory.shared.prefetchIfNeeded()
     }
     
     var body: some Scene {

bitchat/Nostr/GeoRelayDirectory.swift

@@ -1,7 +1,8 @@
 import Foundation
 
 /// Directory of online Nostr relays with approximate GPS locations, used for geohash routing.
-struct GeoRelayDirectory {
+@MainActor
+final class GeoRelayDirectory {
     struct Entry: Hashable {
         let host: String
         let lat: Double
@@ -9,10 +10,17 @@ struct GeoRelayDirectory {
     }
 
     static let shared = GeoRelayDirectory()
-    private let entries: [Entry]
+    private(set) var entries: [Entry] = []
+    private let cacheFileName = "georelays_cache.csv"
+    private let lastFetchKey = "georelay.lastFetchAt"
+    private let remoteURL = URL(string: "https://raw.githubusercontent.com/permissionlesstech/georelays/refs/heads/main/nostr_relays.csv")!
+    private let fetchInterval: TimeInterval = 60 * 60 * 24 // 24h
 
     private init() {
-        self.entries = GeoRelayDirectory.loadEntries()
+        // Load cached or bundled data synchronously
+        self.entries = self.loadLocalEntries()
+        // Fire-and-forget remote refresh if stale
+        prefetchIfNeeded()
     }
 
     /// Returns up to `count` relay URLs (wss://) closest to the geohash center.
@@ -32,23 +40,72 @@ struct GeoRelayDirectory {
         return sorted.map { "wss://\($0.host)" }
     }
 
-    // MARK: - Loading
+    // MARK: - Remote Fetch
-    private static func loadEntries() -> [Entry] {
+    func prefetchIfNeeded() {
-        // Try bundled resource first
+        let now = Date()
-        if let url = Bundle.main.url(forResource: "online_relays_gps", withExtension: "csv") ??
+        let last = UserDefaults.standard.object(forKey: lastFetchKey) as? Date ?? .distantPast
-                     Bundle.main.url(forResource: "online_relays_gps", withExtension: "csv", subdirectory: "relays"),
+        guard now.timeIntervalSince(last) >= fetchInterval else { return }
-           let data = try? Data(contentsOf: url),
+        fetchRemote()
-           let text = String(data: data, encoding: .utf8) {
-            return parseCSV(text)
     }
-        // Try filesystem path (development/test environments)
+
+    private func fetchRemote() {
+        let req = URLRequest(url: remoteURL, cachePolicy: .reloadIgnoringLocalCacheData, timeoutInterval: 15)
+        let task = URLSession.shared.dataTask(with: req) { [weak self] data, _, error in
+            guard let self = self else { return }
+            if let data = data, error == nil, let text = String(data: data, encoding: .utf8) {
+                let parsed = GeoRelayDirectory.parseCSV(text)
+                if !parsed.isEmpty {
+                    Task { @MainActor in
+                        self.entries = parsed
+                        self.persistCache(text)
+                        UserDefaults.standard.set(Date(), forKey: self.lastFetchKey)
+                        SecureLogger.log("GeoRelayDirectory: refreshed \(parsed.count) relays from remote", category: SecureLogger.session, level: .info)
+                    }
+                    return
+                }
+            }
+            SecureLogger.log("GeoRelayDirectory: remote fetch failed; keeping local entries", category: SecureLogger.session, level: .warning)
+        }
+        task.resume()
+    }
+
+    private func persistCache(_ text: String) {
+        guard let url = cacheURL() else { return }
+        do {
+            try text.data(using: .utf8)?.write(to: url, options: .atomic)
+        } catch {
+            SecureLogger.log("GeoRelayDirectory: failed to write cache: \(error)", category: SecureLogger.session, level: .warning)
+        }
+    }
+
+    // MARK: - Loading
+    private func loadLocalEntries() -> [Entry] {
+        // Prefer cached file if present
+        if let cache = self.cacheURL(),
+           let data = try? Data(contentsOf: cache),
+           let text = String(data: data, encoding: .utf8) {
+            let arr = parseCSV(text)
+            if !arr.isEmpty { return arr }
+        }
+        // Try bundled resource(s)
+        let bundleCandidates = [
+            Bundle.main.url(forResource: "nostr_relays", withExtension: "csv"),
+            Bundle.main.url(forResource: "online_relays_gps", withExtension: "csv"),
+            Bundle.main.url(forResource: "online_relays_gps", withExtension: "csv", subdirectory: "relays")
+        ].compactMap { $0 }
+        for url in bundleCandidates {
+            if let data = try? Data(contentsOf: url), let text = String(data: data, encoding: .utf8) {
+                let arr = parseCSV(text)
+                if !arr.isEmpty { return arr }
+            }
+        }
+        // Try filesystem path (development/test)
         if let cwd = FileManager.default.currentDirectoryPath as String?,
            let data = try? Data(contentsOf: URL(fileURLWithPath: cwd).appendingPathComponent("relays/online_relays_gps.csv")),
            let text = String(data: data, encoding: .utf8) {
             return parseCSV(text)
         }
-        // No data available
+        SecureLogger.log("GeoRelayDirectory: no local CSV found; entries empty", category: SecureLogger.session, level: .warning)
-        SecureLogger.log("GeoRelayDirectory: relay CSV not found; falling back to default relay set", category: SecureLogger.session, level: .warning)
         return []
     }
 
@@ -62,12 +119,26 @@ struct GeoRelayDirectory {
             if idx == 0 && line.lowercased().contains("relay url") { continue }
             let parts = line.split(separator: ",").map { String($0).trimmingCharacters(in: .whitespaces) }
             guard parts.count >= 3 else { continue }
-            let host = parts[0].replacingOccurrences(of: "wss://", with: "")
+            var host = parts[0]
+            host = host.replacingOccurrences(of: "https://", with: "")
+            host = host.replacingOccurrences(of: "http://", with: "")
+            host = host.replacingOccurrences(of: "wss://", with: "")
+            host = host.replacingOccurrences(of: "ws://", with: "")
+            host = host.trimmingCharacters(in: CharacterSet(charactersIn: "/"))
             guard let lat = Double(parts[1]), let lon = Double(parts[2]) else { continue }
             result.insert(Entry(host: host, lat: lat, lon: lon))
         }
         return Array(result)
     }
+
+    private func cacheURL() -> URL? {
+        do {
+            let base = try FileManager.default.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
+            let dir = base.appendingPathComponent("bitchat", isDirectory: true)
+            try? FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
+            return dir.appendingPathComponent(cacheFileName)
+        } catch { return nil }
+    }
 }
 
 // MARK: - Distance