Add DNG as a valid photo filetype

Author: ianrahman

SignalServiceKit/Util/ImageMetadata/ImageMetadata.swift

@@ -12,6 +12,7 @@ public enum ImageFormat: CustomStringConvertible {
     case tiff
     case jpeg
     case bmp
+    case dng
     case webp
     case heic
     case heif
@@ -30,6 +31,8 @@ public enum ImageFormat: CustomStringConvertible {
             "ImageFormat_Jpeg"
         case .bmp:
             "ImageFormat_Bmp"
+        case .dng:
+            "ImageFormat_Dng"
         case .webp:
             "ImageFormat_Webp"
         case .heic:
@@ -51,6 +54,8 @@ public enum ImageFormat: CustomStringConvertible {
             return MimeType.imageJpeg
         case .bmp:
             return MimeType.imageBmp
+        case .dng:
+            return MimeType.imageDng
         case .webp:
             return MimeType.imageWebp
         case .heic:
@@ -66,7 +71,7 @@ public enum ImageFormat: CustomStringConvertible {
         switch self {
         case .unknown:
             return false
-        case .png, .tiff, .jpeg, .bmp, .webp, .heic, .heif:
+        case .png, .tiff, .jpeg, .bmp, .dng, .webp, .heic, .heif:
             return true
         case .gif:
             return source.ows_hasValidGifSize
@@ -98,6 +103,9 @@ public enum ImageFormat: CustomStringConvertible {
             guard let mimeType else { return true }
             return (mimeType.caseInsensitiveCompare(MimeType.imageBmp.rawValue) == .orderedSame ||
                     mimeType.caseInsensitiveCompare(MimeType.imageXWindowsBmp.rawValue) == .orderedSame)
+        case .dng:
+            guard let mimeType else { return true }
+            return mimeType.caseInsensitiveCompare(MimeType.imageDng.rawValue) == .orderedSame
         case .webp:
             guard let mimeType else { return true }
             return mimeType.caseInsensitiveCompare(MimeType.imageWebp.rawValue) == .orderedSame

SignalServiceKit/Util/MimeTypeUtil.swift

@@ -15,6 +15,7 @@ public enum MimeType: String {
     case applicationZip = "application/zip"
     case imageApng = "image/apng"
     case imageBmp = "image/bmp"
+    case imageDng = "image/x-adobe-dng"
     case imageGif = "image/gif"
     case imageHeic = "image/heic"
     case imageHeif = "image/heif"
@@ -74,7 +75,7 @@ public enum MimeTypeUtil {
     public static let supportedAudioUtiTypes: Set<String> = Set(utiTypesForMimeTypes(supportedAudioMimeTypesToExtensionTypes.keys))
     public static let supportedInputImageUtiTypes: Set<String> = Set(utiTypesForMimeTypes(supportedImageMimeTypesToExtensionTypes.keys))
     public static let supportedOutputImageUtiTypes: Set<String> = Set(utiTypesForMimeTypes(supportedImageMimeTypesToExtensionTypes.keys,
-                                                                                           excluding: [MimeType.imageWebp.rawValue, MimeType.imageHeic.rawValue, MimeType.imageHeif.rawValue]))
+                                                                                           excluding: [MimeType.imageWebp.rawValue, MimeType.imageHeic.rawValue, MimeType.imageHeif.rawValue, MimeType.imageDng.rawValue]))
     public static let supportedAnimatedImageUtiTypes: Set<String> = Set(utiTypesForMimeTypes(supportedMaybeAnimatedMimeTypesToExtensionTypes.keys))
     private static func utiTypesForMimeTypes<S: Sequence<String>>(_ mimeTypes: S, excluding excludedMimeTypes: Set<String>? = nil) -> Set<String> {
         var result = Set<String>()
@@ -188,6 +189,7 @@ public enum MimeTypeUtil {
         MimeType.imageXTiff.rawValue: "tif",
         MimeType.imageBmp.rawValue: "bmp",
         MimeType.imageXWindowsBmp.rawValue: "bmp",
+        MimeType.imageDng.rawValue: "dng",
         MimeType.imageHeic.rawValue: "heic",
         MimeType.imageHeif.rawValue: "heif",
         MimeType.imageWebp.rawValue: "webp",