From 7403e70893e9e5e1280efdcba9e9dedcb2c6903c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Leon=20B=C3=B6ttger?= <leon.boettger@icloud.com>
Date: Sun, 29 Jun 2025 18:58:58 +0200
Subject: [PATCH] Set creation date for images using EXIF

---
 NearbyShare/InboundNearbyConnection.swift | 52 ++++++++++++++++++++++-
 QuickDrop.xcodeproj/project.pbxproj       |  8 ++--
 2 files changed, 55 insertions(+), 5 deletions(-)

diff --git a/NearbyShare/InboundNearbyConnection.swift b/NearbyShare/InboundNearbyConnection.swift
index 06a6742..770d5c8 100644
--- a/NearbyShare/InboundNearbyConnection.swift
+++ b/NearbyShare/InboundNearbyConnection.swift
@@ -11,7 +11,7 @@ import CryptoKit
 import Foundation
 import Network
 import System
-
+import ImageIO
 import BigInt
 import SwiftECC
 
@@ -518,6 +518,9 @@ public class SaveFilesManager {
     public func registerFileFinishedDownloading(_ fileURL: URL) {
         filesFinishedDownloading.append(fileURL)
         filesFinishedDownloadingSinceLastRun.append(fileURL)
+        
+        // read out EXIF timestamp and manually set file creation date to it
+        applyEXIFTimestamps(at: fileURL)
     }
     
     public func movePendingFilesToTarget() {
@@ -633,6 +636,53 @@ public class SaveFilesManager {
             fatalError("Failed to get downloads directory: \(error)")
         }
     }
+    
+    /// Returns the EXIF original date of an image file, adjusted to the current time zone.
+    private func exifOriginalDate(from url: URL) -> Date? {
+        guard let imageSource = CGImageSourceCreateWithURL(url as CFURL, nil),
+              let properties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil) as? [CFString: Any],
+              let exif = properties[kCGImagePropertyExifDictionary] as? [CFString: Any],
+              let dateString = exif[kCGImagePropertyExifDateTimeOriginal] as? String
+        else {
+            return nil
+        }
+
+        let formatter = DateFormatter()
+        formatter.dateFormat = "yyyy:MM:dd HH:mm:ss"
+        formatter.timeZone = TimeZone.current  // Use the current device time zone
+        return formatter.date(from: dateString)
+    }
+
+    
+    /// Applies EXIF timestamps to a given file or directory.
+    private func applyEXIFTimestamps(at url: URL) {
+        let fm = FileManager.default
+        var isDir: ObjCBool = false
+        guard fm.fileExists(atPath: url.path, isDirectory: &isDir) else { return }
+        
+        if isDir.boolValue {
+            // It's a directory — enumerate files
+            if let enumerator = fm.enumerator(at: url, includingPropertiesForKeys: [.isRegularFileKey]) {
+                for case let fileURL as URL in enumerator {
+                    guard (try? fileURL.resourceValues(forKeys: [.isRegularFileKey]))?.isRegularFile == true else { continue }
+                    applyEXIFTimestamp(to: fileURL)
+                }
+            }
+        } else {
+            // It's a single file
+            applyEXIFTimestamp(to: url)
+        }
+    }
+    
+    /// Applies EXIF timestamp (if available) to a single file
+    private func applyEXIFTimestamp(to fileURL: URL) {
+        guard let exifDate = exifOriginalDate(from: fileURL) else {
+            return
+        }
+
+        // Set the "creation date"
+        try? FileManager.default.setAttributes([.creationDate: exifDate], ofItemAtPath: fileURL.path)
+    }
 }
 
 extension Data {
diff --git a/QuickDrop.xcodeproj/project.pbxproj b/QuickDrop.xcodeproj/project.pbxproj
index 3d164a3..6a20336 100644
--- a/QuickDrop.xcodeproj/project.pbxproj
+++ b/QuickDrop.xcodeproj/project.pbxproj
@@ -825,8 +825,8 @@
 				MTL_FAST_MATH = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = macosx;
-				SHARED_BUILD = 46;
-				SHARED_VERSION = 1.9.4;
+				SHARED_BUILD = 47;
+				SHARED_VERSION = 1.10;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 			};
@@ -884,8 +884,8 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
 				SDKROOT = macosx;
-				SHARED_BUILD = 46;
-				SHARED_VERSION = 1.9.4;
+				SHARED_BUILD = 47;
+				SHARED_VERSION = 1.10;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
 			};