feat(iOS): Store all known UTIs to clipboard

Previously we only stored a couple of mime-types to the clipboard, but
this misses out copying images/etc. to the clipboard in a format
understandable to other applications.

To improve this, we can copy every UTI we know about to the clipboard.
We'll always know about HTML and Text since as these are defined by
Apple, so this will work fine with our previous code.

Signed-off-by: Skyler Grey <skyler.grey@collabora.com>
Change-Id: Ifb13fd910d63a985ad015335658815af3bd69f6b

ios/Mobile/DocumentViewController.mm

@@ -295,7 +295,7 @@ - (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView {
 }
 
 // This is the same method as Java_org_libreoffice_androidlib_LOActivity_getClipboardContent, with minimal editing to work with objective C
-- (bool)getClipboardWithTypesPlain:(out NSString ** _Nullable)plain HTML:(out NSString ** _Nullable)html {
+- (bool)getClipboardContent:(out NSMutableDictionary *)content {
     const char** mimeTypes = nullptr;
     size_t outCount = 0;
     char  **outMimeTypes = nullptr;
@@ -313,12 +313,18 @@ - (bool)getClipboardWithTypesPlain:(out NSString ** _Nullable)plain HTML:(out NS
 
         for (size_t i = 0; i < outCount; ++i)
         {
-            // Create new LokClipboardEntry instance
-
-            if (strcmp(outMimeTypes[i], "text/html") == 0) {
-                *html = outStreams[i] == NULL ? @"" : [NSString stringWithUTF8String:outStreams[i]];
-            } else {
-                *plain = outStreams[i] == NULL ? @"" : [NSString stringWithUTF8String:outStreams[i]];
+            NSString * identifier = [NSString stringWithUTF8String:outMimeTypes[i]];
+
+            // For interop with other apps, if this mime-type is known we can export it
+            UTType * uti = [UTType typeWithMIMEType:identifier];
+            if (uti != nil && !uti.dynamic) {
+                if ([uti conformsToType:UTTypePlainText]) {
+                    [content setValue:outStreams[i] == NULL ? @"" : [NSString stringWithUTF8String:outStreams[i]] forKey:uti.identifier];
+                } else if (uti != nil && [uti conformsToType:UTTypeImage]) {
+                    [content setValue:[UIImage imageWithData:[NSData dataWithBytes:outStreams[i] length:outSizes[i]]] forKey:uti.identifier];
+                } else {
+                    [content setValue:[NSData dataWithBytes:outStreams[i] length:outSizes[i]] forKey:uti.identifier];
+                }
             }
         }
         bResult = true;
@@ -338,12 +344,18 @@ - (bool)getClipboardWithTypesPlain:(out NSString ** _Nullable)plain HTML:(out NS
 
         for (size_t i = 0; i < outCount; ++i)
         {
-            // Create new LokClipboardEntry instance
-
-            if (strcmp(outMimeTypes[i], "text/html") == 0) {
-                *html = outStreams[i] == NULL ? @"" : [NSString stringWithUTF8String:outStreams[i]];
-            } else {
-                *plain = outStreams[i] == NULL ? @"" : [NSString stringWithUTF8String:outStreams[i]];
+            NSString * identifier = [NSString stringWithUTF8String:outMimeTypes[i]];
+
+            // For interop with other apps, if this mime-type is known we can export it
+            UTType * uti = [UTType typeWithMIMEType:identifier];
+            if (uti != nil && !uti.dynamic) {
+                if ([uti conformsToType:UTTypePlainText]) {
+                    [content setValue:outStreams[i] == NULL ? @"" : [NSString stringWithUTF8String:outStreams[i]] forKey:uti.identifier];
+                } else if (uti != nil && [uti conformsToType:UTTypeImage]) {
+                    [content setValue:[UIImage imageWithData:[NSData dataWithBytes:outStreams[i] length:outSizes[i]]] forKey:uti.identifier];
+                } else {
+                    [content setValue:[NSData dataWithBytes:outStreams[i] length:outSizes[i]] forKey:uti.identifier];
+                }
             }
         }
         bResult = true;
@@ -370,21 +382,15 @@ - (void)userContentController:(WKUserContentController *)userContentController d
 
             replyHandler([NSString stringWithFormat:@"%@ %@", encodedPlainPayload, encodedHtmlPayload], nil);
         } else if ([message.body isEqualToString:@"write"]) {
-            NSString * _Nullable plain;
-            NSString * _Nullable html;
-
-            bool success = [self getClipboardWithTypesPlain:&plain HTML:&html];
+            NSMutableDictionary * pasteboardItem = [NSMutableDictionary dictionaryWithCapacity:2];
+            bool success = [self getClipboardContent:pasteboardItem];
 
             if (!success) {
                 replyHandler(nil, @"Failed to get clipboard contents...");
                 return;
             }
 
             UIPasteboard * pasteboard = [UIPasteboard generalPasteboard];
-
-            NSMutableDictionary * pasteboardItem = [NSMutableDictionary dictionaryWithCapacity:2];
-            [pasteboardItem setValue:plain forKey:UTTypeUTF8PlainText.identifier];
-            [pasteboardItem setValue:html forKey:UTTypeHTML.identifier];
 
             [pasteboard setItems:[NSArray arrayWithObject:pasteboardItem]];