fix: missing file broadcast and leave message signatures + allow local development (#1078)

* add signatures to file transfers and LEAVE messages

* chore: setup project for local development and signing

---------

Co-authored-by: jack <212554440+jackjackbits@users.noreply.github.com>

bitchatShareExtension/Info.plist

@@ -2,6 +2,8 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>AppGroupID</key>
+	<string>$(APP_GROUP_ID)</string>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 	<key>CFBundleDisplayName</key>

bitchatShareExtension/ShareViewController.swift

@@ -13,7 +13,7 @@ import UniformTypeIdentifiers
 /// Avoids deprecated Social framework and SLComposeServiceViewController.
 final class ShareViewController: UIViewController {
     // Bundle.main.bundleIdentifier would get the extension's bundleID
-    private static let groupID = "group.chat.bitchat"
+    private static let groupID = Bundle.main.object(forInfoDictionaryKey: "AppGroupID") as? String ?? "group.chat.bitchat"
 
     private enum Strings {
         static let nothingToShare = String(localized: "share.status.nothing_to_share", comment: "Shown when the share extension receives no content")

bitchatShareExtension/bitchatShareExtension.entitlements

@@ -6,7 +6,7 @@
 	<true/>
 	<key>com.apple.security.application-groups</key>
 	<array>
-		<string>group.chat.bitchat</string>
+		<string>$(APP_GROUP_ID)</string>
 	</array>
 </dict>
 </plist>