Implements the file upload using RocketChatClient.

app/src/main/java/chat/rocket/android/chatroom/presentation/ChatRoomPresenter.kt

@@ -15,13 +15,14 @@ import chat.rocket.core.internal.realtime.subscribeRoomMessages
 import chat.rocket.core.internal.realtime.unsubscibre
 import chat.rocket.core.internal.rest.messages
 import chat.rocket.core.internal.rest.sendMessage
+import chat.rocket.core.internal.rest.uploadFile
 import chat.rocket.core.model.Message
 import chat.rocket.core.model.Value
-import chat.rocket.core.model.attachment.Attachment
 import kotlinx.coroutines.experimental.CommonPool
 import kotlinx.coroutines.experimental.channels.Channel
 import kotlinx.coroutines.experimental.launch
 import timber.log.Timber
+import java.io.File
 import javax.inject.Inject
 
 class ChatRoomPresenter @Inject constructor(private val view: ChatRoomView,
@@ -90,13 +91,21 @@ class ChatRoomPresenter @Inject constructor(private val view: ChatRoomView,
         }
     }
 
-    fun sendFile(chatRoomId: String, fileName: String) {
+    fun uploadFile(roomId: String,
+                   file: File,
+                   mimeType: String,
+                   msg: String,
+                   description: String) {
         launchUI(strategy) {
             view.showLoading()
             try {
-//            client.sendMessage(chatRoomId)
+                client.uploadFile(roomId, file, mimeType, msg, description)
             } catch (ex: RocketChatException) {
-
+                ex.message?.let {
+                    view.showMessage(it)
+                }.ifNull {
+                    view.showGenericErrorMessage()
+                 }
             } finally {
                 view.hideLoading()
             }

app/src/main/java/chat/rocket/android/chatroom/presentation/ChatRoomView.kt

@@ -22,11 +22,11 @@ interface ChatRoomView : LoadingView, MessageView {
     fun sendMessage(text: String)
 
     /**
-     * Send a file to a chat room.
+     * Uploads a file to a chat room.
      *
      * @param uri The file URI to send.
      */
-    fun sendFile(uri: Uri)
+    fun uploadFile(uri: Uri)
 
     /**
      * Shows a (recent) message sent to a chat room.

app/src/main/java/chat/rocket/android/chatroom/ui/ChatRoomFragment.kt

@@ -23,6 +23,7 @@ import dagger.android.support.AndroidSupportInjection
 import kotlinx.android.synthetic.main.fragment_chat_room.*
 import kotlinx.android.synthetic.main.message_attachment_options.*
 import kotlinx.android.synthetic.main.message_composer.*
+import java.io.File
 import javax.inject.Inject
 
 fun newInstance(chatRoomId: String, chatRoomName: String, chatRoomType: String, isChatRoomReadOnly: Boolean): Fragment {
@@ -88,7 +89,7 @@ class ChatRoomFragment : Fragment(), ChatRoomView {
     override fun onActivityResult(requestCode: Int, resultCode: Int, resultData: Intent?) {
         if (requestCode == REQUEST_CODE_FOR_PERFORM_SAF && resultCode == Activity.RESULT_OK) {
             if (resultData != null) {
-                sendFile(resultData.data)
+                uploadFile(resultData.data)
             }
         }
     }
@@ -120,13 +121,24 @@ class ChatRoomFragment : Fragment(), ChatRoomView {
         }
     }
 
-    override fun sendFile(uri: Uri) {
+    override fun uploadFile(uri: Uri) {
         var fileName: String? = null
+        var mimeType: String? = null
+        var fileRealPath: String? = null
         activity?.apply {
             fileName = uri.getFileName(this)
-        }
-        if (fileName != null) {
-            presenter.sendFile(chatRoomId, fileName.toString())
+            mimeType = uri.getMimeType(this)
+            fileRealPath = uri.getRealPathFromURI(this)
+
+            if (fileName != null && mimeType != null && fileRealPath != null) {
+                presenter.uploadFile(
+                    chatRoomId,
+                    File(fileRealPath),
+                    mimeType.toString(),
+                    "", // TODO Just leaving it for now, in the future lets add the possibility to add a message with the file to be uploaded.
+                    fileName.toString()
+                )
+            }
         }
     }
 

app/src/main/java/chat/rocket/android/util/extensions/String.kt

 package chat.rocket.android.util.extensions
 
 import android.app.Activity
+import android.content.ContentResolver
+import android.content.Context
 import android.net.Uri
 import android.widget.TextView
 import android.provider.OpenableColumns
-
-
+import android.webkit.MimeTypeMap
+import android.provider.MediaStore
 
 fun String.ifEmpty(value: String): String {
     if (isEmpty()) {
@@ -51,4 +53,23 @@ fun Uri.getFileSize(activity: Activity): String? {
         }
     }
     return fileSize
+}
+
+fun Uri.getMimeType(context: Context): String {
+    return if (scheme == ContentResolver.SCHEME_CONTENT) {
+        context.contentResolver.getType(this)
+    } else {
+        val fileExtension = MimeTypeMap.getFileExtensionFromUrl(toString())
+        MimeTypeMap.getSingleton().getMimeTypeFromExtension(fileExtension.toLowerCase())
+    }
+}
+
+fun Uri.getRealPathFromURI(context: Context): String? {
+    val cursor = context.contentResolver.query(this, arrayOf(MediaStore.Images.Media.DATA), null, null, null)
+
+    cursor.use { cursor ->
+        val columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA)
+        cursor.moveToFirst()
+        return cursor.getString(columnIndex)
+    }
 }
\ No newline at end of file