mirror of
https://github.com/permissionlesstech/bitchat-android.git
synced 2026-08-22 07:06:05 +00:00
c5964184e9
This commit introduces a comprehensive feature for sharing the BitChat application offline using a self-hosted Wi-Fi Direct hotspot. This enables mesh network expansion by allowing users to distribute the app without requiring an internet connection.
Key components:
- **`HotspotManager`**: A new class that manages the creation and lifecycle of a Wi-Fi P2P (Wi-Fi Direct) group. It handles generating secure credentials (SSID/password), acquiring WakeLocks, and monitoring connected peers. It supports custom credentials on Android 10+ and falls back to system-generated ones on older versions.
- **`ApkWebServer`**: A lightweight HTTP server based on `NanoHTTPD` that serves the APK file and a user-friendly HTML landing page to connected devices.
- **`ApkSharingUtils`**: A utility to detect whether the app is installed as a single or split APK, collect the necessary files, and copy them to a cache directory for sharing.
- **`ApkInstaller`**: A utility using the `PackageInstaller` API to handle the installation of single or split APKs received from another user.
- **`HotspotActivity`**: A new Compose-based UI that guides the user through starting the hotspot, displays connection details (Wi-Fi credentials, QR codes for Wi-Fi and the download URL), and shows the number of connected peers. It also handles the necessary runtime permissions (`NEARBY_WIFI_DEVICES` or `ACCESS_FINE_LOCATION`).
- **Configuration**:
- Adds necessary Wi-Fi and P2P permissions to `AndroidManifest.xml`.
- Defines a `FileProvider` path for APK sharing in `file_paths.xml`.
- Adds numerous string resources for the new UI.
318 lines
8.3 KiB
Kotlin
318 lines
8.3 KiB
Kotlin
package com.bitchat.android.hotspot
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import android.content.Context
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import android.util.Log
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import fi.iki.elonen.NanoHTTPD
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import java.io.File
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import java.io.FileInputStream
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/**
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* Lightweight HTTP server for serving the universal APK over Wi-Fi P2P hotspot.
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* Based on NanoHTTPD.
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*/
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class ApkWebServer(
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private val context: Context,
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private val apkFile: File,
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private val port: Int = DEFAULT_PORT
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) : NanoHTTPD(port) {
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companion object {
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private const val TAG = "ApkWebServer"
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const val DEFAULT_PORT = 9999
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}
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private val appVersion: String by lazy {
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try {
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val packageInfo = context.packageManager.getPackageInfo(context.packageName, 0)
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packageInfo.versionName ?: "Unknown"
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} catch (e: Exception) {
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"Unknown"
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}
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}
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override fun serve(session: IHTTPSession): Response {
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val uri = session.uri ?: "/"
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Log.d(TAG, "Request: ${session.method} $uri from ${session.remoteIpAddress}")
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return when {
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uri.endsWith(".apk") || uri == "/bitchat.apk" -> {
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serveApk()
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}
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uri == "/favicon.ico" -> {
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newFixedLengthResponse(Response.Status.NOT_FOUND, "text/plain", "Not found")
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}
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else -> {
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serveLandingPage()
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}
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}
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}
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/**
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* Serve the APK file.
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*/
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private fun serveApk(): Response {
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return try {
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if (!apkFile.exists()) {
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Log.e(TAG, "APK file not found: ${apkFile.path}")
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return newFixedLengthResponse(
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Response.Status.NOT_FOUND,
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"text/plain",
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"APK file not found"
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)
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}
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Log.d(TAG, "Serving APK: ${apkFile.name} (${apkFile.length() / 1024 / 1024}MB)")
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val inputStream = FileInputStream(apkFile)
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val response = newFixedLengthResponse(
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Response.Status.OK,
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"application/vnd.android.package-archive",
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inputStream,
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apkFile.length()
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)
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response.addHeader("Content-Disposition", "attachment; filename=\"bitchat-${appVersion}.apk\"")
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response.addHeader("Accept-Ranges", "bytes")
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response
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} catch (e: Exception) {
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Log.e(TAG, "Error serving APK", e)
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newFixedLengthResponse(
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Response.Status.INTERNAL_ERROR,
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"text/plain",
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"Error serving APK: ${e.message}"
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)
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}
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}
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/**
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* Serve the HTML landing page.
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*/
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private fun serveLandingPage(): Response {
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val html = generateLandingPageHtml()
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return newFixedLengthResponse(
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Response.Status.OK,
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"text/html",
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html
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)
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}
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/**
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* Generate HTML landing page.
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*/
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private fun generateLandingPageHtml(): String {
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val apkSizeMb = apkFile.length() / 1024 / 1024
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return """
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
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<title>Download BitChat</title>
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<style>
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* {
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margin: 0;
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padding: 0;
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box-sizing: border-box;
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}
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body {
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font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
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background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
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min-height: 100vh;
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display: flex;
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align-items: center;
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justify-content: center;
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padding: 20px;
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color: #333;
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}
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.container {
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background: white;
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border-radius: 20px;
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padding: 40px 30px;
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max-width: 500px;
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width: 100%;
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box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
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text-align: center;
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}
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.logo {
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font-size: 64px;
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margin-bottom: 20px;
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}
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h1 {
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font-size: 32px;
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margin-bottom: 10px;
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color: #667eea;
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}
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.subtitle {
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font-size: 16px;
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color: #666;
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margin-bottom: 30px;
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}
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.info-grid {
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display: grid;
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grid-template-columns: 1fr 1fr;
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gap: 15px;
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margin-bottom: 30px;
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}
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.info-box {
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background: #f5f7fa;
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padding: 15px;
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border-radius: 10px;
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}
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.info-label {
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font-size: 12px;
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color: #888;
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text-transform: uppercase;
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font-weight: 600;
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margin-bottom: 5px;
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}
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.info-value {
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font-size: 18px;
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font-weight: bold;
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color: #333;
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}
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.download-button {
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display: inline-block;
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background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
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color: white;
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padding: 18px 40px;
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border-radius: 50px;
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text-decoration: none;
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font-size: 18px;
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font-weight: 600;
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margin-bottom: 30px;
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transition: transform 0.2s, box-shadow 0.2s;
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box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
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}
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.download-button:hover {
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transform: translateY(-2px);
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box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
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}
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.download-button:active {
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transform: translateY(0);
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}
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.instructions {
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text-align: left;
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background: #f5f7fa;
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padding: 20px;
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border-radius: 10px;
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margin-top: 20px;
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}
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.instructions h3 {
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font-size: 16px;
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margin-bottom: 15px;
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color: #667eea;
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}
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.instructions ol {
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margin-left: 20px;
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}
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.instructions li {
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margin-bottom: 10px;
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line-height: 1.6;
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font-size: 14px;
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color: #555;
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}
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.warning {
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background: #fff3cd;
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border: 1px solid #ffc107;
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padding: 15px;
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border-radius: 10px;
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margin-top: 20px;
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font-size: 13px;
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color: #856404;
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text-align: left;
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}
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.warning strong {
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display: block;
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margin-bottom: 5px;
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}
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</style>
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</head>
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<body>
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<div class="container">
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<div class="logo">🔒</div>
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<h1>BitChat</h1>
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<p class="subtitle">Secure Mesh Messaging</p>
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<div class="info-grid">
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<div class="info-box">
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<div class="info-label">Version</div>
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<div class="info-value">$appVersion</div>
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</div>
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<div class="info-box">
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<div class="info-label">Size</div>
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<div class="info-value">${apkSizeMb} MB</div>
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</div>
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</div>
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<a href="/bitchat.apk" class="download-button">
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📥 Download BitChat
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</a>
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<div class="instructions">
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<h3>📱 Installation Instructions</h3>
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<ol>
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<li>Tap the download button above</li>
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<li>Wait for the download to complete</li>
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<li>Open the downloaded APK file</li>
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<li>If prompted, enable "Install from unknown sources" for your browser</li>
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<li>Follow the installation prompts</li>
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</ol>
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</div>
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<div class="warning">
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<strong>⚠️ Note:</strong>
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If you already have BitChat installed, you may need to uninstall it first before installing this version. Make sure to backup your data if needed.
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</div>
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</div>
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</body>
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</html>
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""".trimIndent()
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}
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/**
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* Start the server.
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*/
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fun startServer() {
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try {
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start(NanoHTTPD.SOCKET_READ_TIMEOUT, false)
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Log.d(TAG, "Web server started on port $port")
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} catch (e: Exception) {
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Log.e(TAG, "Failed to start web server", e)
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throw e
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}
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}
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/**
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* Stop the server.
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*/
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fun stopServer() {
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try {
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stop()
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Log.d(TAG, "Web server stopped")
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} catch (e: Exception) {
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Log.e(TAG, "Error stopping web server", e)
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}
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}
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}
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