attachments: proper metadata plumbing

app/src/main/java/net/buzzert/kordophonedroid/ui/messagelist/MessageListViewModel.kt

@@ -2,55 +2,23 @@ package net.buzzert.kordophonedroid.ui.messagelist
 
 import android.content.Context
 import android.net.Uri
-import android.util.Log
-import androidx.compose.runtime.mutableStateListOf
-import androidx.core.net.toFile
+import android.webkit.MimeTypeMap
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
-import coil.Coil
-import coil.ComponentRegistry
-import coil.ImageLoader
-import coil.ImageLoaderFactory
-import coil.decode.DataSource
-import coil.decode.ImageSource
-import coil.disk.DiskCache
-import coil.fetch.FetchResult
-import coil.fetch.Fetcher
-import coil.fetch.SourceResult
-import coil.memory.MemoryCache
-import coil.request.CachePolicy
-import coil.request.Options
 import dagger.hilt.android.lifecycle.HiltViewModel
-import dagger.hilt.android.qualifiers.ApplicationContext
-import kotlinx.coroutines.channels.consumeEach
-import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.asFlow
 import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.flow.combine
-import kotlinx.coroutines.flow.first
-import kotlinx.coroutines.flow.flowOf
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.launch
 import net.buzzert.kordophone.backend.model.Conversation
 import net.buzzert.kordophone.backend.model.GUID
 import net.buzzert.kordophone.backend.model.Message
 import net.buzzert.kordophone.backend.model.OutgoingMessage
+import net.buzzert.kordophone.backend.model.UploadingAttachmentMetadata
 import net.buzzert.kordophone.backend.server.ChatRepository
-import net.buzzert.kordophonedroid.ui.attachments.AttachmentFetchData
-import net.buzzert.kordophonedroid.ui.attachments.AttachmentViewModel
-import okio.ByteString.Companion.toByteString
-import java.io.BufferedInputStream
-import java.io.ByteArrayInputStream
-import java.io.InputStream
-import java.nio.file.FileSystem
-import java.util.Date
-import java.util.UUID
-import java.util.concurrent.TimeUnit
 import javax.inject.Inject
-import javax.xml.transform.Source
-import kotlin.time.Duration.Companion.seconds
 
 const val MVM_LOG: String = "MessageListViewModel"
 
@@ -106,7 +74,22 @@ class MessageListViewModel @Inject constructor(
             conversation = conversation!!,
             attachmentUris = attachmentUris,
             attachmentDataSource = { uri ->
-                context.contentResolver.openInputStream(uri)
+                val resolver = context.contentResolver
+                val inputStream = resolver.openInputStream(uri)
+                val mimeType = resolver.getType(uri)
+
+                val extension = MimeTypeMap.getSingleton().getExtensionFromMimeType(mimeType) ?: "jpg"
+                val filename = uri.lastPathSegment + ".$extension"
+
+                if (inputStream != null && mimeType != null) {
+                    UploadingAttachmentMetadata(
+                        inputStream = inputStream,
+                        mimeType = mimeType,
+                        filename = filename
+                    )
+                } else {
+                    null
+                }
             }
         )
 

backend/src/main/java/net/buzzert/kordophone/backend/model/Message.kt

@@ -71,11 +71,17 @@ data class Message(
     }
 }
 
+data class UploadingAttachmentMetadata(
+    val inputStream: InputStream,
+    val mimeType: String,
+    val filename: String,
+)
+
 data class OutgoingMessage(
     val body: String,
     val conversation: Conversation,
     val attachmentUris: Set<Uri>,
-    val attachmentDataSource: (Uri) -> InputStream?
+    val attachmentDataSource: (Uri) -> UploadingAttachmentMetadata?
 ) {
     val guid: String = UUID.randomUUID().toString()
 

backend/src/main/java/net/buzzert/kordophone/backend/server/ChatRepository.kt

@@ -1,45 +1,37 @@
 package net.buzzert.kordophone.backend.server
 
 import android.net.Uri
-import android.os.Build
 import android.util.Log
-import androidx.annotation.RequiresApi
-import androidx.core.net.toFile
 import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
-import kotlinx.coroutines.cancel
-import kotlinx.coroutines.channels.Channel
-import kotlinx.coroutines.channels.consumeEach
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.SharedFlow
 import kotlinx.coroutines.flow.asSharedFlow
-import kotlinx.coroutines.flow.collect
 import kotlinx.coroutines.flow.collectLatest
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.withContext
 import net.buzzert.kordophone.backend.db.CachedChatDatabase
 import net.buzzert.kordophone.backend.events.MessageDeliveredEvent
 import net.buzzert.kordophone.backend.model.Conversation
 import net.buzzert.kordophone.backend.model.GUID
 import net.buzzert.kordophone.backend.model.Message
 import net.buzzert.kordophone.backend.model.OutgoingMessage
-import net.buzzert.kordophone.backend.model.UpdateItem
 import okhttp3.MediaType
-import okhttp3.OkHttpClient
 import okhttp3.RequestBody
 import okio.BufferedSource
-import java.io.File
 import java.io.InputStream
-import java.lang.Error
-import java.net.URL
 import java.util.Date
-import java.util.Queue
 import java.util.UUID
 import java.util.concurrent.ArrayBlockingQueue
-import java.util.concurrent.CancellationException
+import kotlin.Boolean
+import kotlin.Int
+import kotlin.String
+import kotlin.let
 
 const val REPO_LOG: String = "ChatRepository"
 const val CONVERSATION_MESSAGE_SYNC_COUNT = 10
@@ -210,7 +202,10 @@ class ChatRepository(
     private suspend fun uploadAttachment(filename: String, mediaType: String, source: InputStream): String {
         val attachmentData = source.readBytes()
         val requestBody = RequestBody.create(MediaType.get(mediaType), attachmentData)
-        source.close()
+
+        withContext(Dispatchers.IO) {
+            source.close()
+        }
 
         val response = apiInterface.uploadAttachment(filename, requestBody)
         return response.bodyOnSuccessOrThrow().transferGUID
@@ -237,7 +232,7 @@ class ChatRepository(
             .onEach { it.conversation = conversation }
     }
 
-    private suspend fun handleConversationChangedUpdate(conversation: Conversation) {
+    private fun handleConversationChangedUpdate(conversation: Conversation) {
         Log.d(REPO_LOG, "Handling conversation changed update")
         database.writeConversations(listOf(conversation))
     }
@@ -276,13 +271,10 @@ class ChatRepository(
                     val attachmentGUIDs = mutableListOf<String>()
                     try {
                         for (uri: Uri in it.attachmentUris) {
-                            val inputStream = it.attachmentDataSource(uri)
-                                ?: throw java.lang.Exception("No input stream")
-
-                            val filename = uri.lastPathSegment ?: "attachment.png"
-                            val mediaType = "image/png" // TODO: Actually get this: it needs to be plumbed through ContentResolver
-                            val guid = uploadAttachment(filename, mediaType, inputStream)
+                            val uploadData = it.attachmentDataSource(uri)
+                                ?: throw java.lang.Exception("No upload data.")
 
+                            val guid = uploadAttachment(uploadData.filename, uploadData.mimeType, uploadData.inputStream)
                             attachmentGUIDs.add(guid)
                         }
                     } catch (e: java.lang.Exception) {