Add max length truncation to displayed profile attributes to mitigate spam

Changelog-Fixed: Add max length truncation to displayed profile attributes to mitigate spam
Fixes: #1237

damus/Views/Profile/ProfileName.swift

@@ -65,7 +65,7 @@ struct ProfileName: View {
     }
     
     var name_choice: String {
-        return prefix == "@" ? current_display_name.username : current_display_name.display_name
+        return prefix == "@" ? current_display_name.username.truncate(maxLength: 50) : current_display_name.display_name.truncate(maxLength: 50)
     }
     
     var onlyzapper: Bool {

damus/Views/Profile/ProfileView.swift

@@ -93,6 +93,7 @@ struct ProfileView: View {
     let damus_state: DamusState
     let pfp_size: CGFloat = 90.0
     let bannerHeight: CGFloat = 150.0
+    let max_about_length = 280
     
     static let markdown = Markdown()
     
@@ -103,6 +104,7 @@ struct ProfileView: View {
     @State var action_sheet_presented: Bool = false
     @State var filter_state : FilterState = .posts
     @State var yOffset: CGFloat = 0
+    @State var show_full_about: Bool = false
     
     @StateObject var profile: ProfileModel
     @StateObject var followers: FollowersModel
@@ -403,7 +405,23 @@ struct ProfileView: View {
             if let about = profile_data?.about {
                 let blocks = parse_mentions(content: about, tags: [])
                 let about_string = render_blocks(blocks: blocks, profiles: damus_state.profiles).content.attributed
-                SelectableText(attributedString: about_string, size: .subheadline)
+                let truncated_about = show_full_about ? about_string : about_string.truncateOrNil(maxLength: max_about_length)
+
+                SelectableText(attributedString: truncated_about ?? about_string, size: .subheadline)
+
+                if truncated_about != nil {
+                    if show_full_about {
+                        Button(NSLocalizedString("Show less", comment: "Button to show less of a long profile description.")) {
+                            show_full_about = false
+                        }
+                        .font(.footnote)
+                    } else {
+                        Button(NSLocalizedString("Show more", comment: "Button to show more of a long profile description.")) {
+                            show_full_about = true
+                        }
+                        .font(.footnote)
+                    }
+                }
             } else {
                 Text(verbatim: "")
                     .font(.subheadline)