Update Ghostgram features

Swiftgram/SGContentAnalysis/BUILD

@@ -0,0 +1,18 @@
+load("@build_bazel_rules_swift//swift:swift.bzl", "swift_library")
+
+swift_library(
+    name = "SGContentAnalysis",
+    module_name = "SGContentAnalysis",
+    srcs = glob([
+		"Sources/**/*.swift",
+    ]),
+    copts = [
+        "-warnings-as-errors",
+    ],
+    deps = [
+        "//submodules/SSignalKit/SwiftSignalKit:SwiftSignalKit",
+    ],
+    visibility = [
+        "//visibility:public",
+    ],
+)

Swiftgram/SGContentAnalysis/Sources/ContentAnalysis.swift

@@ -0,0 +1,64 @@
+import SensitiveContentAnalysis
+import SwiftSignalKit
+
+public enum ContentAnalysisError: Error {
+    case generic(_ message: String)
+}
+
+public enum ContentAnalysisMediaType {
+    case image
+    case video
+}
+
+public func canAnalyzeMedia() -> Bool {
+    if #available(iOS 17, *) {
+        let analyzer = SCSensitivityAnalyzer()
+        let policy = analyzer.analysisPolicy
+        return policy != .disabled
+    } else {
+        return false
+    }
+}
+
+
+public func analyzeMediaSignal(_ url: URL, mediaType: ContentAnalysisMediaType = .image) -> Signal<Bool, Error> {
+    return Signal { subscriber in
+        analyzeMedia(url: url, mediaType: mediaType, completion: { result, error in
+            if let result = result {
+                subscriber.putNext(result)
+                subscriber.putCompletion()
+            } else if let error = error {
+                subscriber.putError(error)
+            } else {
+                subscriber.putError(ContentAnalysisError.generic("Unknown response"))
+            }
+        })
+        
+        return ActionDisposable {
+        }
+    }
+}
+
+private func analyzeMedia(url: URL, mediaType: ContentAnalysisMediaType, completion: @escaping (Bool?, Error?) -> Void) {
+    if #available(iOS 17, *) {
+        let analyzer = SCSensitivityAnalyzer()
+        switch mediaType {
+        case .image:
+            analyzer.analyzeImage(at: url) { analysisResult, analysisError in
+                completion(analysisResult?.isSensitive, analysisError)
+            }
+        case .video:
+            Task {
+                do {
+                    let handler = analyzer.videoAnalysis(forFileAt: url)
+                    let response = try await handler.hasSensitiveContent()
+                    completion(response.isSensitive, nil)
+                } catch {
+                    completion(nil, error)
+                }
+            }
+        }
+    } else {
+        completion(false, nil)
+    }
+}