Added code to preview PDF attachments

Podfile.lock

@@ -132,7 +132,7 @@ DEPENDENCIES:
   - SignalCoreKit (from `https://github.com/oxen-io/session-ios-core-kit`, branch `session-version`)
   - Sodium (~> 0.9.1)
   - SwiftProtobuf (~> 1.5.0)
-  - YapDatabase/SQLCipher (from `https://github.com/loki-project/session-ios-yap-database.git`, branch `signal-release`)
+  - YapDatabase/SQLCipher (from `https://github.com/oxen-io/session-ios-yap-database.git`, branch `signal-release`)
   - YYImage (from `https://github.com/signalapp/YYImage`)
   - ZXingObjC
 
@@ -163,7 +163,7 @@ EXTERNAL SOURCES:
     :git: https://github.com/oxen-io/session-ios-core-kit
   YapDatabase:
     :branch: signal-release
-    :git: https://github.com/loki-project/session-ios-yap-database.git
+    :git: https://github.com/oxen-io/session-ios-yap-database.git
   YYImage:
     :git: https://github.com/signalapp/YYImage
 
@@ -179,7 +179,7 @@ CHECKOUT OPTIONS:
     :git: https://github.com/oxen-io/session-ios-core-kit
   YapDatabase:
     :commit: d84069e25e12a16ab4422e5258127a04b70489ad
-    :git: https://github.com/loki-project/session-ios-yap-database.git
+    :git: https://github.com/oxen-io/session-ios-yap-database.git
   YYImage:
     :commit: 62a4cede20bcf31da73d18163408e46a92f171c6
     :git: https://github.com/signalapp/YYImage
@@ -204,6 +204,6 @@ SPEC CHECKSUMS:
   YYImage: f1ddd15ac032a58b78bbed1e012b50302d318331
   ZXingObjC: fdbb269f25dd2032da343e06f10224d62f537bdb
 
-PODFILE CHECKSUM: 7722d8a03a0ebc6ecd0070d02b199bd748992f12
+PODFILE CHECKSUM: 7f961dc4934dd213f5a3277af57d54caef7a4442
 
 COCOAPODS: 1.11.2

Session/Conversations/ConversationVC+Interaction.swift

@@ -1,6 +1,7 @@
 import CoreServices
 import Photos
 import PhotosUI
+import SessionUtilitiesKit
 
 extension ConversationVC : InputViewDelegate, MessageCellDelegate, ContextMenuActionDelegate, ScrollToBottomButtonDelegate,
     SendMediaNavDelegate, UIDocumentPickerDelegate, AttachmentApprovalViewControllerDelegate, GifPickerViewControllerDelegate,
@@ -463,7 +464,14 @@ extension ConversationVC : InputViewDelegate, MessageCellDelegate, ContextMenuAc
                     let thread = self.thread as? TSContactThread,
                     Storage.shared.getContact(with: thread.contactSessionID())?.isTrusted != true {
                     confirmDownload()
-                } else {
+                }
+                else if viewItem.attachmentStream?.contentType == OWSMimeTypeApplicationPdf, let filePathString: String = viewItem.attachmentStream?.originalFilePath {
+                    let fileUrl: URL = URL(fileURLWithPath: filePathString)
+                    let interactionController: UIDocumentInteractionController = UIDocumentInteractionController(url: fileUrl)
+                    interactionController.delegate = self
+                    interactionController.presentPreview(animated: true)
+                }
+                else {
                     // Open the document if possible
                     guard let url = viewItem.attachmentStream?.originalMediaURL else { return }
                     let shareVC = UIActivityViewController(activityItems: [ url ], applicationActivities: nil)
@@ -981,3 +989,11 @@ extension ConversationVC : InputViewDelegate, MessageCellDelegate, ContextMenuAc
         OWSAlerts.showAlert(title: title, message: message)
     }
 }
+
+// MARK: - UIDocumentInteractionControllerDelegate
+
+extension ConversationVC: UIDocumentInteractionControllerDelegate {
+    func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController {
+        return self
+    }
+}

SessionUtilitiesKit/Media/MIMETypeUtil.h

@@ -4,6 +4,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 extern NSString *const OWSMimeTypeApplicationOctetStream;
 extern NSString *const OWSMimeTypeApplicationZip;
+extern NSString *const OWSMimeTypeApplicationPdf;
 extern NSString *const OWSMimeTypeImagePng;
 extern NSString *const OWSMimeTypeImageJpeg;
 extern NSString *const OWSMimeTypeImageGif;

SessionUtilitiesKit/Media/MIMETypeUtil.m

@@ -22,6 +22,7 @@ NSString *const OWSMimeTypeImageBmp2 = @"image/x-windows-bmp";
 NSString *const OWSMimeTypeOversizeTextMessage = @"text/x-signal-plain";
 NSString *const OWSMimeTypeUnknownForTests = @"unknown/mimetype";
 NSString *const OWSMimeTypeApplicationZip = @"application/zip";
+NSString *const OWSMimeTypeApplicationPdf = @"application/pdf";
 
 NSString *const kOversizeTextAttachmentUTI = @"org.whispersystems.oversize-text-attachment";
 NSString *const kOversizeTextAttachmentFileExtension = @"txt";