More explicit media sending

src/Tests/Tests.Messages.ts

@@ -71,7 +71,13 @@ WAConnectionTest('Messages', conn => {
     it('should send an image', async () => {
         const content = await fs.readFile('./Media/meme.jpeg')
         const message = await sendAndRetreiveMessage(conn, content, MessageType.image)
-        
+        assert.ok (message.message?.imageMessage?.jpegThumbnail)
+        await conn.downloadMediaMessage(message)
+    })
+    it('should send a png image', async () => {
+        const content = await fs.readFile('./Media/icon.png')
+        const message = await sendAndRetreiveMessage(conn, content, MessageType.image, { mimetype: 'image/png' })
+        assert.ok (message.message?.imageMessage?.jpegThumbnail)
         await conn.downloadMediaMessage(message)
     })
     it('should send a sticker', async () => {

src/WAConnection/6.MessagesSend.ts

@@ -73,7 +73,11 @@ export class WAConnection extends Base {
             case MessageType.contact:
                 m.contactMessage = WAMessageProto.ContactMessage.create(message as any)
                 break
-            default:
+            case MessageType.image:
+            case MessageType.sticker:
+            case MessageType.document:
+            case MessageType.video:
+            case MessageType.audio:
                 m = await this.prepareMessageMedia(message as Buffer, type, options)
                 break
         }

src/WAConnection/Utils.ts

@@ -238,7 +238,7 @@ export const mediaMessageSHA256B64 = (message: WAMessageContent) => {
 
 /** generates a thumbnail for a given media, if required */
 export async function generateThumbnail(buffer: Buffer, mediaType: MessageType, info: MessageOptions) {
-    if (info.thumbnail === null || info.thumbnail) {
+    if ('thumbnail' in info) {
         // don't do anything if the thumbnail is already provided, or is null
         if (mediaType === MessageType.audio) {
             throw new Error('audio messages cannot have thumbnails')