tv: abstract out tunnel importing

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

2 files changed, 150 insertions, 10 deletions

diff --git a/ui/src/main/java/com/wireguard/android/util/Extensions.kt b/ui/src/main/java/com/wireguard/android/util/Extensions.kt
index b419feef..62bda7e9 100644
--- a/ui/src/main/java/com/wireguard/android/util/Extensions.kt
+++ b/ui/src/main/java/com/wireguard/android/util/Extensions.kt
@@ -21,16 +21,6 @@ fun Context.resolveAttribute(@AttrRes attrRes: Int): Int {
     return typedValue.data
 }
 
-fun Context.formatBytes(bytes: Long): String {
-    return when {
-        bytes < 1024 -> getString(R.string.transfer_bytes, bytes)
-        bytes < 1024 * 1024 -> getString(R.string.transfer_kibibytes, bytes / 1024.0)
-        bytes < 1024 * 1024 * 1024 -> getString(R.string.transfer_mibibytes, bytes / (1024.0 * 1024.0))
-        bytes < 1024 * 1024 * 1024 * 1024L -> getString(R.string.transfer_gibibytes, bytes / (1024.0 * 1024.0 * 1024.0))
-        else -> getString(R.string.transfer_tibibytes, bytes / (1024.0 * 1024.0 * 1024.0) / 1024.0)
-    }
-}
-
 val Any.applicationScope: CoroutineScope
     get() = Application.getCoroutineScope()
 
diff --git a/ui/src/main/java/com/wireguard/android/util/TunnelImporter.kt b/ui/src/main/java/com/wireguard/android/util/TunnelImporter.kt
new file mode 100644
index 00000000..a197bd7b
--- /dev/null
+++ b/ui/src/main/java/com/wireguard/android/util/TunnelImporter.kt
@@ -0,0 +1,150 @@
+/*
+ * Copyright © 2020 WireGuard LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package com.wireguard.android.util
+
+import android.content.ContentResolver
+import android.net.Uri
+import android.provider.OpenableColumns
+import android.util.Log
+import androidx.fragment.app.FragmentManager
+import com.wireguard.android.Application
+import com.wireguard.android.R
+import com.wireguard.android.fragment.ConfigNamingDialogFragment
+import com.wireguard.android.model.ObservableTunnel
+import com.wireguard.config.Config
+import kotlinx.coroutines.Deferred
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.async
+import kotlinx.coroutines.withContext
+import java.io.BufferedReader
+import java.io.ByteArrayInputStream
+import java.io.InputStreamReader
+import java.nio.charset.StandardCharsets
+import java.util.ArrayList
+import java.util.Locale
+import java.util.zip.ZipEntry
+import java.util.zip.ZipInputStream
+
+object TunnelImporter {
+    suspend fun importTunnel(contentResolver: ContentResolver, uri: Uri, messageCallback: (CharSequence) -> Unit) = withContext(Dispatchers.IO) {
+        val context = Application.get().applicationContext
+        val futureTunnels = ArrayList<Deferred<ObservableTunnel>>()
+        val throwables = ArrayList<Throwable>()
+        try {
+            val columns = arrayOf(OpenableColumns.DISPLAY_NAME)
+            var name = ""
+            contentResolver.query(uri, columns, null, null, null)?.use { cursor ->
+                if (cursor.moveToFirst() && !cursor.isNull(0)) {
+                    name = cursor.getString(0)
+                }
+            }
+            if (name.isEmpty()) {
+                name = Uri.decode(uri.lastPathSegment)
+            }
+            var idx = name.lastIndexOf('/')
+            if (idx >= 0) {
+                require(idx < name.length - 1) { context.getString(R.string.illegal_filename_error, name) }
+                name = name.substring(idx + 1)
+            }
+            val isZip = name.toLowerCase(Locale.ROOT).endsWith(".zip")
+            if (name.toLowerCase(Locale.ROOT).endsWith(".conf")) {
+                name = name.substring(0, name.length - ".conf".length)
+            } else {
+                require(isZip) { context.getString(R.string.bad_extension_error) }
+            }
+
+            if (isZip) {
+                ZipInputStream(contentResolver.openInputStream(uri)).use { zip ->
+                    val reader = BufferedReader(InputStreamReader(zip, StandardCharsets.UTF_8))
+                    var entry: ZipEntry?
+                    while (true) {
+                        entry = zip.nextEntry ?: break
+                        name = entry.name
+                        idx = name.lastIndexOf('/')
+                        if (idx >= 0) {
+                            if (idx >= name.length - 1) {
+                                continue
+                            }
+                            name = name.substring(name.lastIndexOf('/') + 1)
+                        }
+                        if (name.toLowerCase(Locale.ROOT).endsWith(".conf")) {
+                            name = name.substring(0, name.length - ".conf".length)
+                        } else {
+                            continue
+                        }
+                        try {
+                            Config.parse(reader)
+                        } catch (e: Throwable) {
+                            throwables.add(e)
+                            null
+                        }?.let {
+                            val nameCopy = name
+                            futureTunnels.add(async(SupervisorJob()) { Application.getTunnelManager().create(nameCopy, it) })
+                        }
+                    }
+                }
+            } else {
+                futureTunnels.add(async(SupervisorJob()) { Application.getTunnelManager().create(name, Config.parse(contentResolver.openInputStream(uri)!!)) })
+            }
+
+            if (futureTunnels.isEmpty()) {
+                if (throwables.size == 1) {
+                    throw throwables[0]
+                } else {
+                    require(throwables.isNotEmpty()) { context.getString(R.string.no_configs_error) }
+                }
+            }
+            val tunnels = futureTunnels.mapNotNull {
+                try {
+                    it.await()
+                } catch (e: Throwable) {
+                    throwables.add(e)
+                    null
+                }
+            }
+            withContext(Dispatchers.Main.immediate) { onTunnelImportFinished(tunnels, throwables, messageCallback) }
+        } catch (e: Throwable) {
+            withContext(Dispatchers.Main.immediate) { onTunnelImportFinished(emptyList(), listOf(e), messageCallback) }
+        }
+    }
+
+    fun importTunnel(parentFragmentManager: FragmentManager, configText: String, messageCallback: (CharSequence) -> Unit) {
+        try {
+            // Ensure the config text is parseable before proceeding…
+            Config.parse(ByteArrayInputStream(configText.toByteArray(StandardCharsets.UTF_8)))
+
+            // Config text is valid, now create the tunnel…
+            ConfigNamingDialogFragment.newInstance(configText).show(parentFragmentManager, null)
+        } catch (e: Throwable) {
+            onTunnelImportFinished(emptyList(), listOf<Throwable>(e), messageCallback)
+        }
+    }
+
+    private fun onTunnelImportFinished(tunnels: List<ObservableTunnel>, throwables: Collection<Throwable>, messageCallback: (CharSequence) -> Unit) {
+        val context = Application.get().applicationContext
+        var message = ""
+        for (throwable in throwables) {
+            val error = ErrorMessages[throwable]
+            message = context.getString(R.string.import_error, error)
+            Log.e(TAG, message, throwable)
+        }
+        if (tunnels.size == 1 && throwables.isEmpty())
+            message = context.getString(R.string.import_success, tunnels[0].name)
+        else if (tunnels.isEmpty() && throwables.size == 1)
+        else if (throwables.isEmpty())
+            message = context.resources.getQuantityString(R.plurals.import_total_success,
+                    tunnels.size, tunnels.size)
+        else if (!throwables.isEmpty())
+            message = context.resources.getQuantityString(R.plurals.import_partial_success,
+                    tunnels.size + throwables.size,
+                    tunnels.size, tunnels.size + throwables.size)
+
+        messageCallback(message)
+    }
+
+    private const val TAG = "WireGuard/TunnelImporter"
+}
\ No newline at end of file