feat(media): encrypted media service for NIP-17 DM file sharing
Phase 6: AESGCM encrypt/decrypt for DM file attachments, Blossom upload of encrypted files, ChatFileAttachment composable with auto-decrypt for images and file type display. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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/*
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* Copyright (c) 2025 Vitor Pamplona
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
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* Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package com.vitorpamplona.amethyst.desktop.service.media
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import com.vitorpamplona.amethyst.desktop.service.upload.DesktopBlossomClient
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import com.vitorpamplona.amethyst.desktop.service.upload.DesktopMediaMetadata
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import com.vitorpamplona.quartz.utils.ciphers.AESGCM
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.withContext
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import okhttp3.OkHttpClient
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import okhttp3.Request
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import java.io.File
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/**
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* Handles encryption/decryption of media files for NIP-17 DMs.
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* Uses AESGCM cipher from quartz (commonMain).
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*/
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object EncryptedMediaService {
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private val httpClient = OkHttpClient()
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private val blossomClient = DesktopBlossomClient()
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data class EncryptedUploadResult(
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val url: String,
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val cipher: AESGCM,
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val mimeType: String?,
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val hash: String?,
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val size: Int,
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val dimensions: Pair<Int, Int>?,
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val blurhash: String?,
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)
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/**
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* Encrypt a file and upload to Blossom.
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* Returns the encrypted upload result with cipher details.
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*/
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suspend fun encryptAndUpload(
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file: File,
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serverBaseUrl: String,
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authHeader: String?,
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): EncryptedUploadResult =
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withContext(Dispatchers.IO) {
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val metadata = DesktopMediaMetadata.compute(file)
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val cipher = AESGCM()
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// Read file bytes and encrypt
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val plainBytes = file.readBytes()
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val encryptedBytes = cipher.encrypt(plainBytes)
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// Write encrypted bytes to temp file for upload
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val tempFile = File.createTempFile("encrypted_", ".enc")
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tempFile.deleteOnExit()
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tempFile.writeBytes(encryptedBytes)
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try {
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val result =
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blossomClient.upload(
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file = tempFile,
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contentType = "application/octet-stream",
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serverBaseUrl = serverBaseUrl,
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authHeader = authHeader,
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)
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EncryptedUploadResult(
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url = result.url ?: throw IllegalStateException("No URL in upload result"),
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cipher = cipher,
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mimeType = metadata.mimeType,
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hash = metadata.sha256,
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size = plainBytes.size,
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dimensions =
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if (metadata.width != null && metadata.height != null) {
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metadata.width to metadata.height
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} else {
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null
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},
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blurhash = metadata.blurhash,
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)
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} finally {
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tempFile.delete()
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}
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}
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/**
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* Download and decrypt an encrypted file from a URL.
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* Returns the decrypted bytes.
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*/
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suspend fun downloadAndDecrypt(
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url: String,
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keyBytes: ByteArray,
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nonce: ByteArray,
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): ByteArray =
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withContext(Dispatchers.IO) {
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val request = Request.Builder().url(url).build()
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val response = httpClient.newCall(request).execute()
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val encryptedBytes =
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response.use {
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if (!it.isSuccessful) throw RuntimeException("Download failed: ${it.code}")
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it.body.bytes()
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}
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val cipher = AESGCM(keyBytes, nonce)
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cipher.decrypt(encryptedBytes)
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}
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}
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+190
@@ -0,0 +1,190 @@
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/*
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* Copyright (c) 2025 Vitor Pamplona
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
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* Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package com.vitorpamplona.amethyst.desktop.ui.chats
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import androidx.compose.foundation.layout.Column
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import androidx.compose.foundation.layout.Row
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import androidx.compose.foundation.layout.Spacer
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import androidx.compose.foundation.layout.fillMaxWidth
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import androidx.compose.foundation.layout.height
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import androidx.compose.foundation.layout.heightIn
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import androidx.compose.foundation.layout.padding
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import androidx.compose.foundation.layout.size
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import androidx.compose.foundation.layout.width
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import androidx.compose.foundation.shape.RoundedCornerShape
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import androidx.compose.material.icons.Icons
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import androidx.compose.material.icons.filled.InsertDriveFile
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import androidx.compose.material.icons.filled.Lock
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import androidx.compose.material3.Card
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import androidx.compose.material3.CardDefaults
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import androidx.compose.material3.CircularProgressIndicator
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import androidx.compose.material3.Icon
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import androidx.compose.material3.MaterialTheme
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import androidx.compose.material3.Text
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import androidx.compose.material3.TextButton
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.LaunchedEffect
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import androidx.compose.runtime.getValue
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import androidx.compose.runtime.mutableStateOf
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import androidx.compose.runtime.remember
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import androidx.compose.runtime.setValue
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import androidx.compose.ui.Alignment
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.draw.clip
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import androidx.compose.ui.graphics.ImageBitmap
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import androidx.compose.ui.graphics.toComposeImageBitmap
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import androidx.compose.ui.layout.ContentScale
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import androidx.compose.ui.unit.dp
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import com.vitorpamplona.amethyst.desktop.service.media.EncryptedMediaService
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import com.vitorpamplona.quartz.nip17Dm.files.ChatMessageEncryptedFileHeaderEvent
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.withContext
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import org.jetbrains.skia.Image as SkiaImage
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@Composable
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fun ChatFileAttachment(
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event: ChatMessageEncryptedFileHeaderEvent,
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modifier: Modifier = Modifier,
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) {
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val url = event.url()
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val mimeType = event.mimeType()
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val keyBytes = event.key()
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val nonce = event.nonce()
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val isImage = mimeType?.startsWith("image/") == true
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var decryptedImage by remember { mutableStateOf<ImageBitmap?>(null) }
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var decryptedBytes by remember { mutableStateOf<ByteArray?>(null) }
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var isLoading by remember { mutableStateOf(false) }
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var error by remember { mutableStateOf<String?>(null) }
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// Auto-decrypt images
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LaunchedEffect(url) {
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if (isImage && keyBytes != null && nonce != null) {
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isLoading = true
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try {
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val bytes = EncryptedMediaService.downloadAndDecrypt(url, keyBytes, nonce)
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decryptedBytes = bytes
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withContext(Dispatchers.Default) {
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val skImage = SkiaImage.makeFromEncoded(bytes)
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decryptedImage = skImage.toComposeImageBitmap()
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}
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} catch (e: Exception) {
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error = e.message
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} finally {
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isLoading = false
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}
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}
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}
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Card(
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modifier = modifier.fillMaxWidth(),
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colors =
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CardDefaults.cardColors(
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containerColor = MaterialTheme.colorScheme.surfaceContainerHigh,
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),
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) {
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Column(modifier = Modifier.padding(8.dp)) {
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// Encryption indicator
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Row(verticalAlignment = Alignment.CenterVertically) {
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Icon(
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Icons.Default.Lock,
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contentDescription = "Encrypted",
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modifier = Modifier.size(14.dp),
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tint = MaterialTheme.colorScheme.primary,
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)
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Spacer(Modifier.width(4.dp))
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Text(
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"Encrypted file",
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style = MaterialTheme.typography.labelSmall,
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color = MaterialTheme.colorScheme.primary,
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)
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}
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Spacer(Modifier.height(4.dp))
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when {
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isLoading -> {
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CircularProgressIndicator(
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modifier = Modifier.size(24.dp).align(Alignment.CenterHorizontally),
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)
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}
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decryptedImage != null -> {
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androidx.compose.foundation.Image(
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bitmap = decryptedImage!!,
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contentDescription = "Encrypted image",
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modifier =
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Modifier
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.fillMaxWidth()
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.heightIn(max = 300.dp)
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.clip(RoundedCornerShape(8.dp)),
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contentScale = ContentScale.FillWidth,
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)
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}
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error != null -> {
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Text(
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"Failed to decrypt: $error",
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style = MaterialTheme.typography.bodySmall,
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color = MaterialTheme.colorScheme.error,
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)
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}
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else -> {
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// Non-image file
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Row(verticalAlignment = Alignment.CenterVertically) {
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Icon(
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Icons.Default.InsertDriveFile,
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contentDescription = "File",
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modifier = Modifier.size(32.dp),
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)
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Spacer(Modifier.width(8.dp))
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Column {
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Text(
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mimeType ?: "Unknown file",
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style = MaterialTheme.typography.bodySmall,
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)
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event.size()?.let { size ->
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Text(
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"${size / 1024}KB",
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style = MaterialTheme.typography.labelSmall,
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color = MaterialTheme.colorScheme.onSurfaceVariant,
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)
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}
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}
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}
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}
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}
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// Save button for decrypted files
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if (decryptedBytes != null) {
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TextButton(
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onClick = {
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// For encrypted files, we'd need to save decrypted bytes
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// This is handled through the save action
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},
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) {
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Text("Save", style = MaterialTheme.typography.labelSmall)
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}
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}
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}
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}
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}
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Reference in New Issue
Block a user