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lily 2026-08-05 15:12:54 -04:00
commit 8d2c6ca504
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11
.gitignore vendored Normal file
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*.iml
.gradle/
/local.properties
.idea/
.DS_Store
/build
/app/build
/captures
.externalNativeBuild
.cxx
/receiver/receiver

56
app/build.gradle.kts Normal file
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plugins {
alias(libs.plugins.android.application)
alias(libs.plugins.kotlin.android)
alias(libs.plugins.kotlin.compose)
}
android {
namespace = "com.example.filedrop"
compileSdk = 36
defaultConfig {
applicationId = "com.example.filedrop"
minSdk = 26
targetSdk = 36
versionCode = 1
versionName = "1.0"
}
buildTypes {
release {
isMinifyEnabled = false
proguardFiles(
getDefaultProguardFile("proguard-android-optimize.txt"),
"proguard-rules.pro",
)
}
}
compileOptions {
sourceCompatibility = JavaVersion.VERSION_21
targetCompatibility = JavaVersion.VERSION_21
}
kotlin {
jvmToolchain(21)
}
buildFeatures {
compose = true
}
}
dependencies {
implementation(libs.androidx.core.ktx)
implementation(libs.androidx.lifecycle.runtime.ktx)
implementation(libs.androidx.lifecycle.viewmodel.compose)
implementation(libs.androidx.activity.compose)
implementation(platform(libs.androidx.compose.bom))
implementation(libs.androidx.ui)
implementation(libs.androidx.ui.graphics)
implementation(libs.androidx.ui.tooling.preview)
implementation(libs.androidx.material3)
implementation(libs.androidx.datastore.preferences)
implementation(libs.okhttp)
debugImplementation(libs.androidx.ui.tooling)
}

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app/proguard-rules.pro vendored Normal file
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# Keep OkHttp platform-specific classes referenced reflectively.
-dontwarn okhttp3.internal.platform.**
-dontwarn org.conscrypt.**
-dontwarn org.bouncycastle.**
-dontwarn org.openjsse.**

24
app/src/main/AndroidManifest.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:networkSecurityConfig="@xml/network_security_config"
android:supportsRtl="true"
android:theme="@style/Theme.FileDrop">
<activity
android:name=".MainActivity"
android:exported="true"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

197
app/src/main/java/com/example/filedrop/MainActivity.kt Normal file
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package com.example.filedrop
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.rememberLauncherForActivityResult
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.activity.result.contract.ActivityResultContracts
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.material3.Button
import androidx.compose.material3.Card
import androidx.compose.material3.LinearProgressIndicator
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Scaffold
import androidx.compose.material3.SnackbarHost
import androidx.compose.material3.SnackbarHostState
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.material3.dynamicDarkColorScheme
import androidx.compose.material3.dynamicLightColorScheme
import androidx.compose.material3.MaterialTheme.colorScheme
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import androidx.compose.material3.darkColorScheme
import androidx.compose.material3.lightColorScheme
import androidx.compose.foundation.isSystemInDarkTheme
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import androidx.lifecycle.viewmodel.compose.viewModel
import android.os.Build
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
enableEdgeToEdge()
setContent {
AppTheme {
FileDropScreen()
}
}
}
}
@Composable
private fun AppTheme(content: @Composable () -> Unit) {
val dark = isSystemInDarkTheme()
val context = LocalContext.current
val scheme = when {
Build.VERSION.SDK_INT >= Build.VERSION_CODES.S ->
if (dark) dynamicDarkColorScheme(context)
else dynamicLightColorScheme(context)
dark -> darkColorScheme()
else -> lightColorScheme()
}
MaterialTheme(colorScheme = scheme, content = content)
}
@Composable
private fun FileDropScreen(vm: MainViewModel = viewModel()) {
val address by vm.address.collectAsStateWithLifecycle()
val token by vm.token.collectAsStateWithLifecycle()
val items by vm.items.collectAsStateWithLifecycle()
val message by vm.message.collectAsStateWithLifecycle()
val snackbarHostState = remember { SnackbarHostState() }
val picker = rememberLauncherForActivityResult(
ActivityResultContracts.OpenMultipleDocuments(),
) { uris -> if (uris.isNotEmpty()) vm.onFilesPicked(uris) }
LaunchedEffect(message) {
message?.let {
snackbarHostState.showSnackbar(it)
vm.messageShown()
}
}
Scaffold(
snackbarHost = { SnackbarHost(snackbarHostState) },
) { padding ->
Column(
modifier = Modifier
.fillMaxSize()
.padding(padding)
.padding(16.dp),
verticalArrangement = Arrangement.spacedBy(12.dp),
) {
Text(
"Drop to PC",
style = MaterialTheme.typography.headlineSmall,
fontWeight = FontWeight.SemiBold,
)
OutlinedTextField(
value = address,
onValueChange = vm::setAddress,
label = { Text("PC address") },
placeholder = { Text("192.168.1.42:8787") },
singleLine = true,
modifier = Modifier.fillMaxWidth(),
)
OutlinedTextField(
value = token,
onValueChange = vm::setToken,
label = { Text("Auth token") },
singleLine = true,
modifier = Modifier.fillMaxWidth(),
)
Button(
onClick = { picker.launch(arrayOf("*/*")) },
modifier = Modifier.fillMaxWidth(),
) {
Text("Pick files")
}
LazyColumn(
modifier = Modifier.fillMaxWidth(),
verticalArrangement = Arrangement.spacedBy(8.dp),
) {
items(items, key = { it.uri }) { item ->
UploadRow(item, onRetry = { vm.retry(item.uri) })
}
}
}
}
}
@Composable
private fun UploadRow(item: UploadItem, onRetry: () -> Unit) {
Card(modifier = Modifier.fillMaxWidth()) {
Column(modifier = Modifier.padding(12.dp)) {
Row(
modifier = Modifier.fillMaxWidth(),
horizontalArrangement = Arrangement.SpaceBetween,
verticalAlignment = Alignment.CenterVertically,
) {
Text(
item.name,
style = MaterialTheme.typography.bodyMedium,
modifier = Modifier.weight(1f, fill = false),
)
Text(
when (item.status) {
UploadStatus.PENDING -> "Waiting"
UploadStatus.UPLOADING -> "${(item.progress * 100).toInt()}%"
UploadStatus.DONE -> "Done"
UploadStatus.ERROR -> "Failed"
},
style = MaterialTheme.typography.labelMedium,
color = when (item.status) {
UploadStatus.DONE -> colorScheme.primary
UploadStatus.ERROR -> colorScheme.error
else -> colorScheme.onSurfaceVariant
},
)
}
if (item.status == UploadStatus.UPLOADING || item.status == UploadStatus.PENDING) {
Spacer(Modifier.height(8.dp))
if (item.progress > 0f) {
LinearProgressIndicator(
progress = { item.progress },
modifier = Modifier.fillMaxWidth(),
)
} else {
LinearProgressIndicator(modifier = Modifier.fillMaxWidth())
}
}
if (item.status == UploadStatus.ERROR) {
Spacer(Modifier.height(4.dp))
item.error?.let {
Text(it, style = MaterialTheme.typography.bodySmall, color = colorScheme.error)
}
TextButton(onClick = onRetry) { Text("Retry") }
}
}
}
}

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app/src/main/java/com/example/filedrop/MainViewModel.kt Normal file
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package com.example.filedrop
import android.app.Application
import android.net.Uri
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.SharingStarted
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.stateIn
import kotlinx.coroutines.launch
enum class UploadStatus { PENDING, UPLOADING, DONE, ERROR }
data class UploadItem(
val uri: Uri,
val name: String,
val size: Long,
val progress: Float = 0f,
val status: UploadStatus = UploadStatus.PENDING,
val error: String? = null,
)
class MainViewModel(app: Application) : AndroidViewModel(app) {
private val settings = Settings(app)
private val uploader = Uploader(app.contentResolver)
val address: StateFlow<String> = settings.address
.stateIn(viewModelScope, SharingStarted.WhileSubscribed(5000), "")
val token: StateFlow<String> = settings.token
.stateIn(viewModelScope, SharingStarted.WhileSubscribed(5000), "")
private val _items = MutableStateFlow<List<UploadItem>>(emptyList())
val items: StateFlow<List<UploadItem>> = _items
private val _message = MutableStateFlow<String?>(null)
val message: StateFlow<String?> = _message
fun setAddress(value: String) = viewModelScope.launch { settings.setAddress(value) }
fun setToken(value: String) = viewModelScope.launch { settings.setToken(value) }
fun messageShown() { _message.value = null }
fun onFilesPicked(uris: List<Uri>) {
val picked = uris.map { uri ->
val meta = uploader.queryMeta(uri)
UploadItem(uri = uri, name = meta.name, size = meta.size)
}
_items.value = picked
uploadAll()
}
fun retry(uri: Uri) = uploadOne(uri)
private fun uploadAll() {
_items.value.forEach { uploadOne(it.uri) }
}
private fun uploadOne(uri: Uri) {
val addr = address.value
if (addr.isBlank()) {
_message.value = "Set the PC address first"
return
}
val item = _items.value.firstOrNull { it.uri == uri } ?: return
update(uri) { it.copy(status = UploadStatus.UPLOADING, progress = 0f, error = null) }
viewModelScope.launch {
val result = uploader.upload(
address = addr,
token = token.value,
uri = uri,
meta = FileMeta(item.name, item.size),
onProgress = { fraction ->
if (fraction >= 0f) update(uri) { it.copy(progress = fraction) }
},
)
result.onSuccess {
update(uri) { it.copy(status = UploadStatus.DONE, progress = 1f) }
_message.value = "Sent ${item.name}"
}.onFailure { e ->
update(uri) { it.copy(status = UploadStatus.ERROR, error = e.message) }
_message.value = "Failed ${item.name}: ${e.message}"
}
}
}
private fun update(uri: Uri, transform: (UploadItem) -> UploadItem) {
_items.value = _items.value.map { if (it.uri == uri) transform(it) else it }
}
}

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app/src/main/java/com/example/filedrop/Settings.kt Normal file
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package com.example.filedrop
import android.content.Context
import androidx.datastore.core.DataStore
import androidx.datastore.preferences.core.Preferences
import androidx.datastore.preferences.core.edit
import androidx.datastore.preferences.core.stringPreferencesKey
import androidx.datastore.preferences.preferencesDataStore
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.map
private val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = "settings")
/** Persisted connection settings: the PC address and the shared auth token. */
class Settings(private val context: Context) {
private val addressKey = stringPreferencesKey("address")
private val tokenKey = stringPreferencesKey("token")
val address: Flow<String> = context.dataStore.data.map { it[addressKey].orEmpty() }
val token: Flow<String> = context.dataStore.data.map { it[tokenKey].orEmpty() }
suspend fun setAddress(value: String) {
context.dataStore.edit { it[addressKey] = value.trim() }
}
suspend fun setToken(value: String) {
context.dataStore.edit { it[tokenKey] = value.trim() }
}
}

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app/src/main/java/com/example/filedrop/Uploader.kt Normal file
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package com.example.filedrop
import android.content.ContentResolver
import android.net.Uri
import android.provider.OpenableColumns
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext
import okhttp3.MediaType.Companion.toMediaTypeOrNull
import okhttp3.MultipartBody
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.RequestBody
import okio.BufferedSink
import java.io.IOException
import java.util.concurrent.TimeUnit
/** Basic file metadata resolved from a content Uri. */
data class FileMeta(val name: String, val size: Long)
/** Streams a content Uri to the PC receiver as a multipart upload, one file per request. */
class Uploader(private val contentResolver: ContentResolver) {
private val client = OkHttpClient.Builder()
.connectTimeout(15, TimeUnit.SECONDS)
.writeTimeout(0, TimeUnit.SECONDS) // large files stream indefinitely
.readTimeout(30, TimeUnit.SECONDS)
.build()
fun queryMeta(uri: Uri): FileMeta {
var name = "file"
var size = -1L
contentResolver.query(uri, null, null, null, null)?.use { cursor ->
if (cursor.moveToFirst()) {
val nameIdx = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME)
val sizeIdx = cursor.getColumnIndex(OpenableColumns.SIZE)
if (nameIdx >= 0 && !cursor.isNull(nameIdx)) name = cursor.getString(nameIdx)
if (sizeIdx >= 0 && !cursor.isNull(sizeIdx)) size = cursor.getLong(sizeIdx)
}
}
return FileMeta(name, size)
}
/**
* Uploads [uri] to `http://<address>/upload`. [onProgress] receives a 0f..1f fraction
* (or -1f when the size is unknown). Returns the server's response text on success.
*/
suspend fun upload(
address: String,
token: String,
uri: Uri,
meta: FileMeta,
onProgress: (Float) -> Unit,
): Result<String> = withContext(Dispatchers.IO) {
runCatching {
val url = "http://${address.trim().trimEnd('/')}/upload"
val mediaType = contentResolver.getType(uri)?.toMediaTypeOrNull()
val fileBody = object : RequestBody() {
override fun contentType() = mediaType
override fun contentLength() = meta.size
override fun writeTo(sink: BufferedSink) {
val input = contentResolver.openInputStream(uri)
?: throw IOException("Cannot open $uri")
input.use {
val buffer = ByteArray(64 * 1024)
var uploaded = 0L
while (true) {
val read = it.read(buffer)
if (read == -1) break
sink.write(buffer, 0, read)
uploaded += read
onProgress(if (meta.size > 0) uploaded.toFloat() / meta.size else -1f)
}
}
}
}
val multipart = MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart("file", meta.name, fileBody)
.build()
val requestBuilder = Request.Builder().url(url).post(multipart)
if (token.isNotBlank()) requestBuilder.header("X-Auth", token.trim())
client.newCall(requestBuilder.build()).execute().use { response ->
val body = response.body?.string().orEmpty()
if (!response.isSuccessful) {
throw IOException("HTTP ${response.code}: ${body.ifBlank { response.message }}")
}
onProgress(1f)
body.ifBlank { "saved" }
}
}
}
}

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app/src/main/res/drawable/ic_launcher.xml Normal file
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<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="108dp"
android:height="108dp"
android:viewportWidth="108"
android:viewportHeight="108">
<path
android:fillColor="#1565C0"
android:pathData="M0,0h108v108h-108z" />
<!-- Upward arrow into a tray: "drop to PC". -->
<path
android:fillColor="#FFFFFF"
android:pathData="M54,26l16,16h-10v18h-12v-18h-10z" />
<path
android:fillColor="#FFFFFF"
android:pathData="M34,66h40v10h-40z" />
</vector>

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app/src/main/res/values/strings.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">File Drop</string>
</resources>

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app/src/main/res/values/themes.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- Base activity theme; Compose supplies the Material 3 look. -->
<style name="Theme.FileDrop" parent="android:Theme.Material.Light.NoActionBar" />
</resources>

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app/src/main/res/xml/network_security_config.xml Normal file
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<?xml version="1.0" encoding="utf-8"?>
<!--
This app talks to a receiver on the local network over plain HTTP.
Cleartext is permitted so LAN IPs (e.g. 192.168.x.x:8787) work; TLS on
the LAN is a stretch goal (see plan.md). HTTPS is still used where offered.
-->
<network-security-config>
<base-config cleartextTrafficPermitted="true">
<trust-anchors>
<certificates src="system" />
</trust-anchors>
</base-config>
</network-security-config>

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build.gradle.kts Normal file
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plugins {
alias(libs.plugins.android.application) apply false
alias(libs.plugins.kotlin.android) apply false
alias(libs.plugins.kotlin.compose) apply false
}

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gradle.properties Normal file
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org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
org.gradle.caching=true
org.gradle.configuration-cache=true
android.useAndroidX=true
android.nonTransitiveRClass=true
kotlin.code.style=official

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gradle/libs.versions.toml Normal file
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[versions]
agp = "8.13.2"
kotlin = "2.4.0"
coreKtx = "1.15.0"
lifecycle = "2.8.7"
activityCompose = "1.9.3"
composeBom = "2024.12.01"
datastore = "1.1.7"
okhttp = "4.12.0"
[libraries]
androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
androidx-lifecycle-runtime-ktx = { group = "androidx.lifecycle", name = "lifecycle-runtime-ktx", version.ref = "lifecycle" }
androidx-lifecycle-viewmodel-compose = { group = "androidx.lifecycle", name = "lifecycle-viewmodel-compose", version.ref = "lifecycle" }
androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activityCompose" }
androidx-compose-bom = { group = "androidx.compose", name = "compose-bom", version.ref = "composeBom" }
androidx-ui = { group = "androidx.compose.ui", name = "ui" }
androidx-ui-graphics = { group = "androidx.compose.ui", name = "ui-graphics" }
androidx-ui-tooling = { group = "androidx.compose.ui", name = "ui-tooling" }
androidx-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-tooling-preview" }
androidx-material3 = { group = "androidx.compose.material3", name = "material3" }
androidx-datastore-preferences = { group = "androidx.datastore", name = "datastore-preferences", version.ref = "datastore" }
okhttp = { group = "com.squareup.okhttp3", name = "okhttp", version.ref = "okhttp" }
[plugins]
android-application = { id = "com.android.application", version.ref = "agp" }
kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }

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gradle/wrapper/gradle-wrapper.jar vendored Normal file
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gradle/wrapper/gradle-wrapper.properties vendored Normal file
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distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-bin.zip
networkTimeout=10000
validateDistributionUrl=true
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

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gradlew vendored Executable file
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#!/bin/sh
#
# Copyright © 2015 the original authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
#
##############################################################################
#
# Gradle start up script for POSIX generated by Gradle.
#
# Important for running:
#
# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
# noncompliant, but you have some other compliant shell such as ksh or
# bash, then to run this script, type that shell name before the whole
# command line, like:
#
# ksh Gradle
#
# Busybox and similar reduced shells will NOT work, because this script
# requires all of these POSIX shell features:
# * functions;
# * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
# «${var#prefix}», «${var%suffix}», and «$( cmd )»;
# * compound commands having a testable exit status, especially «case»;
# * various built-in commands including «command», «set», and «ulimit».
#
# Important for patching:
#
# (2) This script targets any POSIX shell, so it avoids extensions provided
# by Bash, Ksh, etc; in particular arrays are avoided.
#
# The "traditional" practice of packing multiple parameters into a
# space-separated string is a well documented source of bugs and security
# problems, so this is (mostly) avoided, by progressively accumulating
# options in "$@", and eventually passing that to Java.
#
# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
# see the in-line comments for details.
#
# There are tweaks for specific operating systems such as AIX, CygWin,
# Darwin, MinGW, and NonStop.
#
# (3) This script is generated from the Groovy template
# https://github.com/gradle/gradle/blob/2d6327017519d23b96af35865dc997fcb544fb40/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
# within the Gradle project.
#
# You can find Gradle at https://github.com/gradle/gradle/.
#
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
app_path=$0
# Need this for daisy-chained symlinks.
while
APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path
[ -h "$app_path" ]
do
ls=$( ls -ld "$app_path" )
link=${ls#*' -> '}
case $link in #(
/*) app_path=$link ;; #(
*) app_path=$APP_HOME$link ;;
esac
done
# This is normally unused
# shellcheck disable=SC2034
APP_BASE_NAME=${0##*/}
# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum
warn () {
echo "$*"
} >&2
die () {
echo
echo "$*"
echo
exit 1
} >&2
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$( uname )" in #(
CYGWIN* ) cygwin=true ;; #(
Darwin* ) darwin=true ;; #(
MSYS* | MINGW* ) msys=true ;; #(
NONSTOP* ) nonstop=true ;;
esac
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD=$JAVA_HOME/jre/sh/java
else
JAVACMD=$JAVA_HOME/bin/java
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD=java
if ! command -v java >/dev/null 2>&1
then
die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
fi
# Increase the maximum file descriptors if we can.
if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
case $MAX_FD in #(
max*)
# In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
MAX_FD=$( ulimit -H -n ) ||
warn "Could not query maximum file descriptor limit"
esac
case $MAX_FD in #(
'' | soft) :;; #(
*)
# In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
# shellcheck disable=SC2039,SC3045
ulimit -n "$MAX_FD" ||
warn "Could not set maximum file descriptor limit to $MAX_FD"
esac
fi
# Collect all arguments for the java command, stacking in reverse order:
# * args from the command line
# * the main class name
# * -classpath
# * -D...appname settings
# * --module-path (only if needed)
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
# For Cygwin or MSYS, switch paths to Windows format before running java
if "$cygwin" || "$msys" ; then
APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
JAVACMD=$( cygpath --unix "$JAVACMD" )
# Now convert the arguments - kludge to limit ourselves to /bin/sh
for arg do
if
case $arg in #(
-*) false ;; # don't mess with options #(
/?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath
[ -e "$t" ] ;; #(
*) false ;;
esac
then
arg=$( cygpath --path --ignore --mixed "$arg" )
fi
# Roll the args list around exactly as many times as the number of
# args, so each arg winds up back in the position where it started, but
# possibly modified.
#
# NB: a `for` loop captures its iteration list before it begins, so
# changing the positional parameters here affects neither the number of
# iterations, nor the values presented in `arg`.
shift # remove old arg
set -- "$@" "$arg" # push replacement arg
done
fi
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Collect all arguments for the java command:
# * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
# and any embedded shellness will be escaped.
# * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
# treated as '${Hostname}' itself on the command line.
set -- \
"-Dorg.gradle.appname=$APP_BASE_NAME" \
-jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
"$@"
# Stop when "xargs" is not available.
if ! command -v xargs >/dev/null 2>&1
then
die "xargs is not available"
fi
# Use "xargs" to parse quoted args.
#
# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
#
# In Bash we could simply go:
#
# readarray ARGS < <( xargs -n1 <<<"$var" ) &&
# set -- "${ARGS[@]}" "$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#
eval "set -- $(
printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
xargs -n1 |
sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
tr '\n' ' '
)" '"$@"'
exec "$JAVACMD" "$@"

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@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@rem SPDX-License-Identifier: Apache-2.0
@rem
@if "%DEBUG%"=="" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%"=="" set DIRNAME=.
@rem This is normally unused
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if %ERRORLEVEL% equ 0 goto execute
echo. 1>&2
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto execute
echo. 1>&2
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2
goto fail
:execute
@rem Setup the command line
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
:end
@rem End local scope for the variables with windows NT shell
if %ERRORLEVEL% equ 0 goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
set EXIT_CODE=%ERRORLEVEL%
if %EXIT_CODE% equ 0 set EXIT_CODE=1
if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
exit /b %EXIT_CODE%
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega

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# Android → PC File Drop
Minimal Kotlin Android app that picks files/images and uploads them to a folder on a PC over the local network.
## Architecture
Two pieces:
1. **PC receiver** — tiny HTTP server that accepts multipart uploads and writes files into a chosen folder.
2. **Android app** — one screen, one button: pick files → POST them to the PC.
No cloud, no accounts, no discovery protocol. You type (or QR-scan) the PC's LAN IP once and save it.
## PC Receiver
**Language:** Go (single binary). Go for "double-click and forget."
**Behavior:**
- Listen on `0.0.0.0:8787`.
- `POST /upload` accepts `multipart/form-data`, saves each part to `DROP_DIR` with its original filename.
- Collision policy: append ` (1)`, ` (2)`, etc.
- Optional shared-secret header (`X-Auth: <token>`) so randos on the same Wi-Fi can't dump files on you.
- `GET /` returns "ok" for a health check.
- Log each received file: name, size, source IP.
it is seen on the local panel so that user locally can download
**Config:**
- `DROP_DIR` — where files land (default `~/Drops`).
- `AUTH_TOKEN` — shared secret (generated on first run, printed + saved to config).
- `PORT` — default 8787.
**Firewall:** open the port on the PC's LAN profile only.
## Android App
**Stack:** Kotlin, Jetpack Compose, single Activity, minSdk 26.
**Screens:** one.
**UI:**
- Text field: PC address (e.g. `192.168.1.42:8787`), persisted in `DataStore`.
- Text field: auth token, persisted.
- Big button: "Pick files".
- Below: list of currently-selected files with progress bars during upload.
- Snackbar for success/failure per file.
**Flow:**
1. Tap button → `ActivityResultContracts.OpenMultipleDocuments()` (handles images, video, any file; no storage permission needed on modern Android).
2. For each returned `Uri`: stream it as a multipart part to `http://<address>/upload` with the auth header.
3. Show per-file progress; on 200, mark done; on error, show retry.
**Networking:** OkHttp with a `MultipartBody`, streaming from `contentResolver.openInputStream(uri)` so big videos don't OOM.
**Manifest:**
- `INTERNET` permission.
- `usesCleartextTraffic="true"` scoped to local IP ranges via `network_security_config.xml` (HTTP is fine on LAN; adding TLS is a stretch goal).
**Share target (stretch):** register as a share target so you can hit "Share → Drop to PC" from the Photos app.
## Protocol
```
POST /upload HTTP/1.1
Host: 192.168.1.42:8787
X-Auth: <token>
Content-Type: multipart/form-data; boundary=...
--boundary
Content-Disposition: form-data; name="file"; filename="IMG_1234.jpg"
Content-Type: image/jpeg
<bytes>
--boundary--
```
Response: `200 OK` with JSON `{"saved": "IMG_1234.jpg"}` or `4xx/5xx` with error text.
## Milestones
1. PC receiver in ~60 lines; test with `curl -F file=@foo.jpg http://localhost:8787/upload -H "X-Auth: ..."`.
2. Android app scaffold: Compose UI, DataStore for settings, file picker returning URIs.
3. Wire up OkHttp multipart upload from a URI stream.
4. Progress + error UI.
5. Package: PC receiver as a systemd user service (Linux) or Task Scheduler entry (Windows) so it autostarts. Android side sideload the APK.
## Stretch
- QR code on PC receiver's `GET /` page encoding `address + token` so first-time setup is scan-once.
- mDNS advertisement (`_filedrop._tcp.local`) so the app can discover the PC without typing IPs.
- TLS with a self-signed cert pinned in the app.
- Share-target intent filter.
- Resume interrupted uploads (`Content-Range`).
## Non-goals
- PC → Android direction (use MTP or a second app instance later).
- Internet / NAT traversal.
- Multiple PCs at once (one address at a time is fine).

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module file-share/receiver
go 1.22

225
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package main
import (
"crypto/rand"
"encoding/hex"
"fmt"
"html"
"io"
"log"
"net"
"net/http"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"
)
func main() {
home, _ := os.UserHomeDir()
cfgDir := filepath.Join(home, ".file-share")
_ = os.MkdirAll(cfgDir, 0o755)
cfgPath := filepath.Join(cfgDir, "receiver.env")
dropDir := env("DROP_DIR", filepath.Join(home, "Drops"))
port := env("PORT", "8787")
host := env("HOST", lanAddress())
authToken := env("AUTH_TOKEN", "")
if authToken == "" {
authToken = loadOrGenerateToken(cfgPath)
}
_ = os.MkdirAll(dropDir, 0o755)
log.Printf("drop dir: %s", dropDir)
log.Printf("auth token: %s", authToken)
log.Printf("listening on http://%s:%s", host, port)
mux := http.NewServeMux()
mux.HandleFunc("GET /{$}", func(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, "ok")
})
mux.HandleFunc("POST /upload", handleUpload(dropDir, authToken))
mux.HandleFunc("GET /files", handleList(dropDir))
mux.HandleFunc("GET /download", handleDownload(dropDir))
log.Fatal(http.ListenAndServe(host+":"+port, mux))
}
func handleUpload(dropDir, authToken string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if authToken != "" && r.Header.Get("X-Auth") != authToken {
http.Error(w, "unauthorized", http.StatusUnauthorized)
return
}
if err := r.ParseMultipartForm(32 << 20); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
files := r.MultipartForm.File["file"]
if len(files) == 0 {
http.Error(w, "no file", http.StatusBadRequest)
return
}
type savedFile struct {
Saved string `json:"saved"`
}
saved := make([]savedFile, 0, len(files))
for _, fh := range files {
src, err := fh.Open()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
dest := uniquePath(dropDir, filepath.Base(fh.Filename))
dst, err := os.Create(dest)
if err != nil {
_ = src.Close()
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
n, err := io.Copy(dst, src)
_ = src.Close()
_ = dst.Close()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
name := filepath.Base(dest)
log.Printf("saved %s (%d bytes) from %s", name, n, r.RemoteAddr)
saved = append(saved, savedFile{Saved: name})
}
w.Header().Set("Content-Type", "application/json")
if len(saved) == 1 {
fmt.Fprintf(w, `{"saved":%q}`, saved[0].Saved)
return
}
fmt.Fprint(w, "[")
for i, s := range saved {
if i > 0 {
fmt.Fprint(w, ",")
}
fmt.Fprintf(w, `{"saved":%q}`, s.Saved)
}
fmt.Fprint(w, "]")
}
}
func handleList(dropDir string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
entries, err := os.ReadDir(dropDir)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
fmt.Fprint(w, `<!doctype html><html><head><meta name="viewport" content="width=device-width, initial-scale=1"><title>Drops</title></head><body><h1>Drops</h1><ul>`)
for _, e := range entries {
if e.IsDir() {
continue
}
info, _ := e.Info()
name := e.Name()
fmt.Fprintf(w, `<li><a href="/download?name=%s">%s</a> (%s)</li>`,
url.QueryEscape(name), html.EscapeString(name), formatBytes(info.Size()))
}
fmt.Fprint(w, `</ul></body></html>`)
}
}
func handleDownload(dropDir string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
name := r.URL.Query().Get("name")
if name == "" {
http.Error(w, "missing name", http.StatusBadRequest)
return
}
path := filepath.Join(dropDir, filepath.Base(name))
http.ServeFile(w, r, path)
}
}
func uniquePath(dir, filename string) string {
if filename == "" {
filename = "unnamed"
}
ext := filepath.Ext(filename)
base := strings.TrimSuffix(filename, ext)
dest := filepath.Join(dir, filename)
if _, err := os.Stat(dest); os.IsNotExist(err) {
return dest
}
for i := 1; ; i++ {
candidate := filepath.Join(dir, base+" ("+strconv.Itoa(i)+")"+ext)
if _, err := os.Stat(candidate); os.IsNotExist(err) {
return candidate
}
}
}
func loadOrGenerateToken(path string) string {
if data, err := os.ReadFile(path); err == nil {
for _, line := range strings.Split(string(data), "\n") {
if strings.HasPrefix(line, "AUTH_TOKEN=") {
return strings.TrimPrefix(line, "AUTH_TOKEN=")
}
}
}
b := make([]byte, 4)
if _, err := rand.Read(b); err != nil {
log.Fatal(err)
}
token := hex.EncodeToString(b)
_ = os.WriteFile(path, []byte("AUTH_TOKEN="+token+"\n"), 0o600)
log.Printf("generated token, saved to %s", path)
return token
}
func lanAddress() string {
addrs, err := net.InterfaceAddrs()
if err != nil {
return "127.0.0.1"
}
var fallback string
for _, a := range addrs {
ipnet, ok := a.(*net.IPNet)
if !ok || ipnet.IP.IsLoopback() || ipnet.IP.To4() == nil {
continue
}
ip := ipnet.IP.To4()
if ip[0] == 192 && ip[1] == 168 {
return ip.String()
}
if fallback == "" && (ip[0] == 10 || (ip[0] == 172 && ip[1] >= 16 && ip[1] <= 31)) {
fallback = ip.String()
}
}
if fallback != "" {
return fallback
}
return "127.0.0.1"
}
func env(key, def string) string {
if v := os.Getenv(key); v != "" {
return v
}
return def
}
func formatBytes(n int64) string {
if n < 1024 {
return strconv.FormatInt(n, 10) + " B"
}
units := []string{"KB", "MB", "GB", "TB"}
f := float64(n) / 1024
for _, u := range units {
if f < 1024 || u == units[len(units)-1] {
return fmt.Sprintf("%.1f %s", f, u)
}
f /= 1024
}
return strconv.FormatInt(n, 10) + " B"
}

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pluginManagement {
repositories {
google {
content {
includeGroupByRegex("com\\.android.*")
includeGroupByRegex("com\\.google.*")
includeGroupByRegex("androidx.*")
}
}
mavenCentral()
gradlePluginPortal()
}
}
dependencyResolutionManagement {
repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
repositories {
google()
mavenCentral()
}
}
rootProject.name = "FileDrop"
include(":app")