Inline long text attachments into backup files.

app/src/main/java/org/thoughtcrime/securesms/backup/v2/ArchiveErrorCases.kt

@@ -170,6 +170,22 @@ object ExportOddities {
     return log(sentTimestamp, "Invalid e164 in sessions switchover event. Exporting an empty event.")
   }
 
+  fun undownloadedLongTextAttachment(sentTimestamp: Long): String {
+    return log(sentTimestamp, "Long text attachment was not yet downloaded. Falling back to the known body with an attachment pointer.")
+  }
+
+  fun unreadableLongTextAttachment(sentTimestamp: Long): String {
+    return log(sentTimestamp, "Long text attachment was unreadable. Falling back to the known body with an attachment pointer.")
+  }
+
+  fun unopenableLongTextAttachment(sentTimestamp: Long): String {
+    return log(sentTimestamp, "Long text attachment failed to open. Falling back to the known body with an attachment pointer.")
+  }
+
+  fun bodyGreaterThanMaxLength(sentTimestamp: Long, length: Int): String {
+    return log(sentTimestamp, "The body length was greater than the max allowed ($length bytes). Trimming to fit.")
+  }
+
   private fun log(sentTimestamp: Long, message: String): String {
     return "[ODDITY][$sentTimestamp] $message"
   }

app/src/main/java/org/thoughtcrime/securesms/backup/v2/exporters/ChatItemArchiveExporter.kt

@@ -13,13 +13,17 @@ import org.signal.core.util.Base64
 import org.signal.core.util.EventTimer
 import org.signal.core.util.Hex
 import org.signal.core.util.ParallelEventTimer
+import org.signal.core.util.StringUtil
 import org.signal.core.util.concurrent.SignalExecutors
+import org.signal.core.util.emptyIfNull
 import org.signal.core.util.isNotNullOrBlank
+import org.signal.core.util.kibiBytes
 import org.signal.core.util.logging.Log
 import org.signal.core.util.logging.logW
 import org.signal.core.util.nullIfBlank
 import org.signal.core.util.nullIfEmpty
 import org.signal.core.util.orNull
+import org.signal.core.util.readFully
 import org.signal.core.util.requireBlob
 import org.signal.core.util.requireBoolean
 import org.signal.core.util.requireInt
@@ -82,8 +86,10 @@ import org.thoughtcrime.securesms.database.model.databaseprotos.MessageExtras
 import org.thoughtcrime.securesms.database.model.databaseprotos.ProfileChangeDetails
 import org.thoughtcrime.securesms.database.model.databaseprotos.SessionSwitchoverEvent
 import org.thoughtcrime.securesms.database.model.databaseprotos.ThreadMergeEvent
+import org.thoughtcrime.securesms.dependencies.AppDependencies
 import org.thoughtcrime.securesms.keyvalue.SignalStore
 import org.thoughtcrime.securesms.linkpreview.LinkPreview
+import org.thoughtcrime.securesms.mms.PartAuthority
 import org.thoughtcrime.securesms.mms.QuoteModel
 import org.thoughtcrime.securesms.payments.FailureReason
 import org.thoughtcrime.securesms.payments.State
@@ -105,6 +111,8 @@ import org.thoughtcrime.securesms.backup.v2.proto.BodyRange as BackupBodyRange
 import org.thoughtcrime.securesms.backup.v2.proto.GiftBadge as BackupGiftBadge
 
 private val TAG = Log.tag(ChatItemArchiveExporter::class.java)
+private val MAX_INLINED_BODY_SIZE = 128.kibiBytes.bytes.toInt()
+private val MAX_INLINED_BODY_SIZE_WITH_LONG_ATTACHMENT_POINTER = 2.kibiBytes.bytes.toInt()
 
 /**
  * An iterator for chat items with a clever performance twist: rather than do the extra queries one at a time (for reactions,
@@ -361,11 +369,6 @@ class ChatItemArchiveExporter(
 
         else -> {
           val attachments = extraData.attachmentsById[record.id]
-          if (attachments?.isNotEmpty() == true && attachments.any { it.contentType == MediaUtil.LONG_TEXT } && record.body.isNullOrBlank()) {
-            Log.w(TAG, ExportSkips.invalidLongTextChatItem(record.dateSent))
-            continue
-          }
-
           val sticker = attachments?.firstOrNull { dbAttachment -> dbAttachment.isSticker }
 
           if (sticker?.stickerLocator != null) {
@@ -963,6 +966,8 @@ private fun BackupMessageRecord.toRemoteDirectStoryReplyMessage(mediaArchiveEnab
 
   val isReaction = MessageTypes.isStoryReaction(this.type)
 
+  val (bodyText, longTextAttachment) = this.getBodyText(attachments)
+
   return DirectStoryReplyMessage(
     emoji = if (isReaction) {
       this.body
@@ -972,10 +977,10 @@ private fun BackupMessageRecord.toRemoteDirectStoryReplyMessage(mediaArchiveEnab
     textReply = if (!isReaction) {
       DirectStoryReplyMessage.TextReply(
         text = Text(
-          body = this.body,
+          body = bodyText,
           bodyRanges = this.bodyRanges?.toRemoteBodyRanges(this.dateSent) ?: emptyList()
         ),
-        longText = attachments?.firstOrNull { it.contentType == MediaUtil.LONG_TEXT }?.toRemoteFilePointer(mediaArchiveEnabled)
+        longText = longTextAttachment?.toRemoteFilePointer(mediaArchiveEnabled)
       )
     } else {
       null
@@ -985,23 +990,25 @@ private fun BackupMessageRecord.toRemoteDirectStoryReplyMessage(mediaArchiveEnab
 }
 
 private fun BackupMessageRecord.toRemoteStandardMessage(exportState: ExportState, mediaArchiveEnabled: Boolean, reactionRecords: List<ReactionRecord>?, mentions: List<Mention>?, attachments: List<DatabaseAttachment>?): StandardMessage {
-  val text = body.nullIfBlank()?.let {
+  val linkPreviews = this.toRemoteLinkPreviews(attachments)
+  val linkPreviewAttachments = linkPreviews.mapNotNull { it.thumbnail.orElse(null) }.toSet()
+  val quotedAttachments = attachments?.filter { it.quote } ?: emptyList()
+  val messageAttachments = attachments
+    ?.filterNot { it.quote }
+    ?.filterNot { linkPreviewAttachments.contains(it) }
+    ?.filterNot { MediaUtil.isLongTextType(it.contentType) }
+    ?: emptyList()
+  val hasVoiceNote = messageAttachments.any { it.voiceNote }
+
+  val (bodyText, longTextAttachment) = this.getBodyText(attachments)
+
+  val text = bodyText.nullIfBlank()?.let {
     Text(
       body = it,
       bodyRanges = (this.bodyRanges?.toRemoteBodyRanges(this.dateSent) ?: emptyList()) + (mentions?.toRemoteBodyRanges(exportState) ?: emptyList())
     )
   }
 
-  val linkPreviews = this.toRemoteLinkPreviews(attachments)
-  val linkPreviewAttachments = linkPreviews.mapNotNull { it.thumbnail.orElse(null) }.toSet()
-  val quotedAttachments = attachments?.filter { it.quote } ?: emptyList()
-  val longTextAttachment = attachments?.firstOrNull { it.contentType == "text/x-signal-plain" }
-  val messageAttachments = attachments
-    ?.filterNot { it.quote }
-    ?.filterNot { linkPreviewAttachments.contains(it) }
-    ?.filterNot { it == longTextAttachment }
-    ?: emptyList()
-  val hasVoiceNote = messageAttachments.any { it.voiceNote }
   return StandardMessage(
     quote = this.toRemoteQuote(exportState, mediaArchiveEnabled, quotedAttachments),
     text = text.takeUnless { hasVoiceNote },
@@ -1012,6 +1019,40 @@ private fun BackupMessageRecord.toRemoteStandardMessage(exportState: ExportState
   )
 }
 
+/**
+ * Retrieves the body text, reading from a long text attachment if necessary. Will return an optional [DatabaseAttachment] that, if present, indicates that
+ * you should set it as the value for [StandardMessage.longText].
+ */
+private fun BackupMessageRecord.getBodyText(attachments: List<DatabaseAttachment>?): Pair<String, DatabaseAttachment?> {
+  val longTextAttachment = attachments?.firstOrNull { it.contentType == "text/x-signal-plain" }
+  if (longTextAttachment == null) {
+    return this.body.emptyIfNull() to null
+  }
+
+  if (longTextAttachment.uri == null || longTextAttachment.transferState != AttachmentTable.TRANSFER_PROGRESS_DONE) {
+    return StringUtil.trimToFit(this.body.emptyIfNull(), MAX_INLINED_BODY_SIZE_WITH_LONG_ATTACHMENT_POINTER) to longTextAttachment
+  }
+
+  val longText = try {
+    PartAuthority.getAttachmentStream(AppDependencies.application, longTextAttachment.uri!!)?.readFully()?.toString(Charsets.UTF_8)
+  } catch (e: IOException) {
+    Log.w(TAG, ExportOddities.unreadableLongTextAttachment(this.dateSent))
+    return this.body.emptyIfNull() to longTextAttachment
+  }
+
+  if (longText == null) {
+    Log.w(TAG, ExportOddities.unopenableLongTextAttachment(this.dateSent))
+    return StringUtil.trimToFit(this.body.emptyIfNull(), MAX_INLINED_BODY_SIZE_WITH_LONG_ATTACHMENT_POINTER) to longTextAttachment
+  }
+
+  val trimmed = StringUtil.trimToFit(longText, MAX_INLINED_BODY_SIZE)
+  if (trimmed.length != longText.length) {
+    Log.w(TAG, ExportOddities.bodyGreaterThanMaxLength(this.dateSent, longText.length))
+  }
+
+  return trimmed to null
+}
+
 private fun BackupMessageRecord.toRemoteQuote(exportState: ExportState, mediaArchiveEnabled: Boolean, attachments: List<DatabaseAttachment>? = null): Quote? {
   if (this.quoteTargetSentTimestamp == MessageTable.QUOTE_NOT_PRESENT_ID || this.quoteAuthor <= 0 || exportState.groupRecipientIds.contains(this.quoteAuthor)) {
     return null

app/src/main/java/org/thoughtcrime/securesms/backup/v2/importer/ChatItemArchiveImporter.kt

@@ -10,6 +10,7 @@ import androidx.core.content.contentValuesOf
 import org.signal.core.util.Base64
 import org.signal.core.util.Hex
 import org.signal.core.util.SqlUtil
+import org.signal.core.util.asList
 import org.signal.core.util.forEach
 import org.signal.core.util.logging.Log
 import org.signal.core.util.orNull
@@ -40,6 +41,7 @@ import org.thoughtcrime.securesms.backup.v2.proto.Sticker
 import org.thoughtcrime.securesms.backup.v2.proto.ViewOnceMessage
 import org.thoughtcrime.securesms.backup.v2.util.toLocalAttachment
 import org.thoughtcrime.securesms.contactshare.Contact
+import org.thoughtcrime.securesms.database.AttachmentTable
 import org.thoughtcrime.securesms.database.CallTable
 import org.thoughtcrime.securesms.database.GroupReceiptTable
 import org.thoughtcrime.securesms.database.MessageTable
@@ -63,6 +65,7 @@ import org.thoughtcrime.securesms.database.model.databaseprotos.PaymentTombstone
 import org.thoughtcrime.securesms.database.model.databaseprotos.ProfileChangeDetails
 import org.thoughtcrime.securesms.database.model.databaseprotos.SessionSwitchoverEvent
 import org.thoughtcrime.securesms.database.model.databaseprotos.ThreadMergeEvent
+import org.thoughtcrime.securesms.dependencies.AppDependencies
 import org.thoughtcrime.securesms.mms.QuoteModel
 import org.thoughtcrime.securesms.payments.CryptoValueUtil
 import org.thoughtcrime.securesms.payments.Direction
@@ -74,6 +77,7 @@ import org.thoughtcrime.securesms.recipients.RecipientId
 import org.thoughtcrime.securesms.stickers.StickerLocator
 import org.thoughtcrime.securesms.util.JsonUtils
 import org.thoughtcrime.securesms.util.MediaUtil
+import org.thoughtcrime.securesms.util.MessageUtil
 import org.whispersystems.signalservice.api.payments.Money
 import org.whispersystems.signalservice.api.push.ServiceId
 import org.whispersystems.signalservice.api.util.UuidUtil
@@ -371,14 +375,17 @@ class ChatItemArchiveImporter(
     }
 
     if (this.directStoryReplyMessage != null) {
-      val longTextAttachment: Attachment? = this.directStoryReplyMessage.textReply?.longText?.toLocalAttachment(
-        importState = importState,
-        contentType = "text/x-signal-plain"
-      )
+      val (trimmedBodyText, longTextAttachment) = this.directStoryReplyMessage.parseBodyText(importState)
+      if (trimmedBodyText != null) {
+        contentValues.put(MessageTable.BODY, trimmedBodyText)
+      }
 
       if (longTextAttachment != null) {
         followUps += { messageRowId ->
-          SignalDatabase.attachments.insertAttachmentsForMessage(messageRowId, listOf(longTextAttachment), emptyList())
+          val ids = SignalDatabase.attachments.insertAttachmentsForMessage(messageRowId, listOf(longTextAttachment), emptyList())
+          ids.values.firstOrNull()?.let { attachmentId ->
+            SignalDatabase.attachments.setTransferState(messageRowId, attachmentId, AttachmentTable.TRANSFER_PROGRESS_DONE)
+          }
         }
       }
     }
@@ -396,23 +403,29 @@ class ChatItemArchiveImporter(
         attachment.toLocalAttachment()
       }
 
-      val longTextAttachments: List<Attachment> = this.standardMessage.longText?.toLocalAttachment(
-        importState = importState,
-        contentType = "text/x-signal-plain"
-      )?.let { listOf(it) } ?: emptyList()
+      val (trimmedBodyText, longTextAttachment) = this.standardMessage.parseBodyText(importState)
+      if (trimmedBodyText != null) {
+        contentValues.put(MessageTable.BODY, trimmedBodyText)
+      }
 
       val quoteAttachments: List<Attachment> = this.standardMessage.quote?.toLocalAttachments() ?: emptyList()
 
-      val hasAttachments = attachments.isNotEmpty() || linkPreviewAttachments.isNotEmpty() || quoteAttachments.isNotEmpty() || longTextAttachments.isNotEmpty()
+      val hasAttachments = attachments.isNotEmpty() || linkPreviewAttachments.isNotEmpty() || quoteAttachments.isNotEmpty() || longTextAttachment != null
 
       if (hasAttachments || linkPreviews.isNotEmpty()) {
         followUps += { messageRowId ->
           val attachmentMap = if (hasAttachments) {
-            SignalDatabase.attachments.insertAttachmentsForMessage(messageRowId, attachments + linkPreviewAttachments + longTextAttachments, quoteAttachments)
+            SignalDatabase.attachments.insertAttachmentsForMessage(messageRowId, attachments + linkPreviewAttachments + longTextAttachment.asList(), quoteAttachments)
           } else {
             emptyMap()
           }
 
+          if (longTextAttachment != null) {
+            attachmentMap[longTextAttachment]?.let { attachmentId ->
+              SignalDatabase.attachments.setTransferState(messageRowId, attachmentId, AttachmentTable.TRANSFER_PROGRESS_DONE)
+            }
+          }
+
           if (linkPreviews.isNotEmpty()) {
             db.update(MessageTable.TABLE_NAME)
               .values(MessageTable.LINK_PREVIEWS to SignalDatabase.messages.getSerializedLinkPreviews(attachmentMap, linkPreviews))
@@ -453,6 +466,54 @@ class ChatItemArchiveImporter(
     return MessageInsert(contentValues, followUp)
   }
 
+  /**
+   * Text that we import from the [StandardMessage.text] field may be too long to put in a database column, needing to instead be broken into a separate
+   * attachment. This handles looking at the state of the frame and giving back the components we need to insert.
+   *
+   * @return If the returned String is non-null, then that means you should replace what we currently have stored as the body with this new, trimmed string.
+   *   If the attachment is non-null, then you should store it along with the message, as it contains the long text.
+   */
+  private fun StandardMessage.parseBodyText(importState: ImportState): Pair<String?, Attachment?> {
+    if (this.longText != null) {
+      return null to this.longText.toLocalAttachment(importState, contentType = "text/x-signal-plain")
+    }
+
+    if (this.text?.body == null) {
+      return null to null
+    }
+
+    val splitResult = MessageUtil.getSplitMessage(AppDependencies.application, this.text.body)
+    if (splitResult.textSlide.isPresent) {
+      return splitResult.body to splitResult.textSlide.get().asAttachment()
+    }
+
+    return null to null
+  }
+
+  /**
+   * Text that we import from the [DirectStoryReplyMessage.textReply] field may be too long to put in a database column, needing to instead be broken into a separate
+   * attachment. This handles looking at the state of the frame and giving back the components we need to insert.
+   *
+   * @return If the returned String is non-null, then that means you should replace what we currently have stored as the body with this new, trimmed string.
+   *   If the attachment is non-null, then you should store it along with the message, as it contains the long text.
+   */
+  private fun DirectStoryReplyMessage.parseBodyText(importState: ImportState): Pair<String?, Attachment?> {
+    if (this.textReply?.longText != null) {
+      return null to this.textReply.longText.toLocalAttachment(importState, contentType = "text/x-signal-plain")
+    }
+
+    if (this.textReply?.text == null) {
+      return null to null
+    }
+
+    val splitResult = MessageUtil.getSplitMessage(AppDependencies.application, this.textReply.text.body)
+    if (splitResult.textSlide.isPresent) {
+      return splitResult.body to splitResult.textSlide.get().asAttachment()
+    }
+
+    return null to null
+  }
+
   private fun ChatItem.toMessageContentValues(fromRecipientId: RecipientId, chatRecipientId: RecipientId, threadId: Long): ContentValues {
     val contentValues = ContentValues()
 

core-util/src/main/java/org/signal/core/util/CollectionsExtensions.kt

@@ -22,3 +22,10 @@ fun <E> List<E>.swap(i: Int, j: Int): List<E> {
   Collections.swap(mutableCopy, i, j)
   return mutableCopy.toList()
 }
+
+/**
+ * Returns the item wrapped in a list, or an empty list of the item is null.
+ */
+fun <E> E?.asList(): List<E> {
+  return if (this == null) emptyList() else listOf(this)
+}

core-util/src/main/java/org/signal/core/util/StringUtil.kt

@@ -1,6 +1,7 @@
 package org.signal.core.util
 
 import android.text.SpannableStringBuilder
+import okio.utf8Size
 import java.io.ByteArrayOutputStream
 import java.io.IOException
 import java.nio.charset.StandardCharsets
@@ -27,7 +28,7 @@ object StringUtil {
       return ""
     }
 
-    if (name.toByteArray(StandardCharsets.UTF_8).size <= maxByteLength) {
+    if (name.utf8Size() <= maxByteLength) {
       return name
     }
 

core-util/src/test/java/org/signal/core/util/StringExtensionsTest.kt

@@ -12,7 +12,7 @@ import org.junit.Test
 class StringExtensionsTest {
 
   @Test
-  fun `splitByByteLength fuzzing`() {
+  fun `splitByByteLength - fuzzing`() {
     val characterSet = "日月木山川田水火金土空海花風雨雪星森犬猫鳥魚虫人子女男友学校車電話本書時分先生愛夢楽音話語映画新古長短高低東西南北春夏秋冬雨雲星夜朝昼電気手足目耳口心頭体家国町村道橋山川本店仕事時間会話思考知識感情自動車飛行機船馬牛羊豚鶏鳥猫犬虎龍"
 
     for (stringSize in 2100..2500) {
@@ -28,7 +28,7 @@ class StringExtensionsTest {
   }
 
   @Test
-  fun idk() {
+  fun `splitByByteLength - long string`() {
     val myString = """
       すべての人間は生まれながらにして自由であり、尊厳と権利において平等である。彼らは理性と良心を授けられており、互いに兄弟愛の精神をもって行動しなければならない。