[appstore] Report Content

This view provides a way to report content (nudity, illegal, spam) to
relays. Clients can use this information to filter or warn if they
choose to.

This is needed for the appstore release

Changelog-Added: Added a way to report content

damus/Models/Report.swift

@@ -0,0 +1,59 @@
+//
+//  Report.swift
+//  damus
+//
+//  Created by William Casarin on 2023-01-24.
+//
+
+import Foundation
+
+enum ReportType: String {
+    case explicit
+    case illegal
+    case spam
+    case impersonation
+}
+
+struct ReportNoteTarget {
+    let pubkey: String
+    let note_id: String
+}
+
+enum ReportTarget {
+    case user(String)
+    case note(ReportNoteTarget)
+}
+
+struct Report {
+    let type: ReportType
+    let target: ReportTarget
+    let message: String
+}
+
+func create_report_tags(target: ReportTarget, type: ReportType) -> [[String]] {
+    var tags: [[String]]
+    switch target {
+    case .user(let pubkey):
+        tags = [["p", pubkey]]
+    case .note(let notet):
+        tags = [["e", notet.note_id], ["p", notet.pubkey]]
+    }
+    
+    tags.append(["report", type.rawValue])
+    return tags
+}
+
+func create_report_event(privkey: String, report: Report) -> NostrEvent? {
+    guard let pubkey = privkey_to_pubkey(privkey: privkey) else {
+        return nil
+    }
+    
+    let kind = 1984
+    let tags = create_report_tags(target: report.target, type: report.type)
+    let ev = NostrEvent(content: report.message, pubkey: pubkey, kind: kind, tags: tags)
+    
+    ev.id = calculate_event_id(ev: ev)
+    ev.sig = sign_event(privkey: privkey, ev: ev)
+    
+    return ev
+}