ui,tunnel: add HTTP proxy setting to Go backend

Only make the HTTP proxy settings visible on supported Android versions,
i.e. Android 10 (AKA Android Q) and later.

Signed-off-by: Mikael Magnusson <mikma@users.sourceforge.net>

3 files changed, 101 insertions, 0 deletions

diff --git a/ui/src/main/java/com/wireguard/android/fragment/TunnelEditorFragment.kt b/ui/src/main/java/com/wireguard/android/fragment/TunnelEditorFragment.kt
index c4c031fa..401c1a14 100644
--- a/ui/src/main/java/com/wireguard/android/fragment/TunnelEditorFragment.kt
+++ b/ui/src/main/java/com/wireguard/android/fragment/TunnelEditorFragment.kt
@@ -17,12 +17,16 @@ import android.view.View
 import android.view.ViewGroup
 import android.view.WindowManager
 import android.view.inputmethod.InputMethodManager
+import android.widget.ArrayAdapter
+import android.widget.AutoCompleteTextView
 import android.widget.EditText
+import android.widget.Filter
 import android.widget.Toast
 import androidx.core.view.MenuProvider
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.lifecycleScope
 import com.google.android.material.snackbar.Snackbar
+import com.google.android.material.textfield.TextInputLayout
 import com.wireguard.android.Application
 import com.wireguard.android.R
 import com.wireguard.android.backend.Tunnel
@@ -32,6 +36,7 @@ import com.wireguard.android.util.AdminKnobs
 import com.wireguard.android.util.BiometricAuthenticator
 import com.wireguard.android.util.ErrorMessages
 import com.wireguard.android.viewmodel.ConfigProxy
+import com.wireguard.android.viewmodel.Constants
 import com.wireguard.config.Config
 import kotlinx.coroutines.launch
 
@@ -43,6 +48,21 @@ class TunnelEditorFragment : BaseFragment(), MenuProvider {
     private var binding: TunnelEditorFragmentBinding? = null
     private var tunnel: ObservableTunnel? = null
 
+    private class MaterialSpinnerAdapter<T>(context: Context, resource: Int, private val objects: List<T>) : ArrayAdapter<T>(context, resource, objects) {
+        private val _filter: Filter by lazy {
+            object : Filter() {
+                override fun performFiltering(constraint: CharSequence?): FilterResults {
+                    return FilterResults()
+                }
+
+                override fun publishResults(constraint: CharSequence?, results: FilterResults?) {
+                }
+            }
+        }
+
+        override fun getFilter(): Filter = _filter
+    }
+
     private fun onConfigLoaded(config: Config) {
         binding?.config = ConfigProxy(config)
     }
@@ -82,6 +102,13 @@ class TunnelEditorFragment : BaseFragment(), MenuProvider {
             executePendingBindings()
             privateKeyTextLayout.setEndIconOnClickListener { config?.`interface`?.generateKeyPair() }
         }
+
+        var httpProxyMenu = binding?.root?.findViewById<TextInputLayout>(R.id.http_proxy_menu)
+        var httpProxyItems = listOf(Constants.HTTP_PROXY_NONE, Constants.HTTP_PROXY_MANUAL) // Constants.HTTP_PROXY_PAC is currently unsupported
+        var httpProxyAdapter = MaterialSpinnerAdapter(requireContext(), R.layout.http_proxy_menu_item, httpProxyItems)
+        var httpProxyMenuText = httpProxyMenu?.editText as? AutoCompleteTextView
+        httpProxyMenuText?.setAdapter(httpProxyAdapter)
+
         return binding?.root
     }
 
diff --git a/ui/src/main/java/com/wireguard/android/util/ErrorMessages.kt b/ui/src/main/java/com/wireguard/android/util/ErrorMessages.kt
index 27495b60..466009f0 100644
--- a/ui/src/main/java/com/wireguard/android/util/ErrorMessages.kt
+++ b/ui/src/main/java/com/wireguard/android/util/ErrorMessages.kt
@@ -114,6 +114,8 @@ object ErrorMessages {
             return resources.getString(R.string.bad_config_explanation_udp_port)
         } else if (bce.location == BadConfigException.Location.MTU) {
             return resources.getString(R.string.bad_config_explanation_positive_number)
+        } else if (bce.location == BadConfigException.Location.HTTP_PROXY) {
+            return resources.getString(R.string.bad_config_explanation_http_proxy)
         } else if (bce.location == BadConfigException.Location.PERSISTENT_KEEPALIVE) {
             return resources.getString(R.string.bad_config_explanation_pka)
         }
diff --git a/ui/src/main/java/com/wireguard/android/viewmodel/InterfaceProxy.kt b/ui/src/main/java/com/wireguard/android/viewmodel/InterfaceProxy.kt
index 004ebed1..16c3e6a3 100644
--- a/ui/src/main/java/com/wireguard/android/viewmodel/InterfaceProxy.kt
+++ b/ui/src/main/java/com/wireguard/android/viewmodel/InterfaceProxy.kt
@@ -4,6 +4,8 @@
  */
 package com.wireguard.android.viewmodel
 
+import android.net.Uri
+import android.os.Build
 import android.os.Parcel
 import android.os.Parcelable
 import androidx.databinding.BaseObservable
@@ -18,6 +20,12 @@ import com.wireguard.crypto.Key
 import com.wireguard.crypto.KeyFormatException
 import com.wireguard.crypto.KeyPair
 
+object Constants {
+    const val HTTP_PROXY_NONE = "None"
+    const val HTTP_PROXY_MANUAL = "Manual"
+    const val HTTP_PROXY_PAC = "Proxy Auto-Config"
+}
+
 class InterfaceProxy : BaseObservable, Parcelable {
     @get:Bindable
     val excludedApplications: ObservableList<String> = ObservableArrayList()
@@ -54,6 +62,44 @@ class InterfaceProxy : BaseObservable, Parcelable {
         }
 
     @get:Bindable
+    var httpProxyMenu: String = ""
+        set(value) {
+            field = value
+            notifyPropertyChanged(BR.httpProxyMenu)
+            notifyPropertyChanged(BR.httpProxyManualVisibility)
+            notifyPropertyChanged(BR.httpProxyPacVisibility)
+        }
+
+    @get:Bindable
+    var httpProxyManualVisibility: Int = 0
+        get() = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) android.view.View.GONE else (if (httpProxyMenu == Constants.HTTP_PROXY_MANUAL) android.view.View.VISIBLE else android.view.View.GONE)
+
+    @get:Bindable
+    var httpProxyHostname: String = ""
+        set(value) {
+            field = value
+            notifyPropertyChanged(BR.httpProxyHostname)
+        }
+
+    @get:Bindable
+    var httpProxyPort: String = ""
+        set(value) {
+            field = value
+            notifyPropertyChanged(BR.httpProxyPort)
+        }
+
+    @get:Bindable
+    var httpProxyPac: String = ""
+        set(value) {
+            field = value
+            notifyPropertyChanged(BR.httpProxyPac)
+        }
+
+    @get:Bindable
+    var httpProxyPacVisibility: Int = 0
+        get() = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) android.view.View.GONE else (if (httpProxyMenu == Constants.HTTP_PROXY_PAC) android.view.View.VISIBLE else android.view.View.GONE)
+
+    @get:Bindable
     var privateKey: String = ""
         set(value) {
             field = value
@@ -76,6 +122,10 @@ class InterfaceProxy : BaseObservable, Parcelable {
         parcel.readStringList(includedApplications)
         listenPort = parcel.readString() ?: ""
         mtu = parcel.readString() ?: ""
+        httpProxyMenu = parcel.readString() ?: ""
+        httpProxyHostname = parcel.readString() ?: ""
+        httpProxyPort = parcel.readString() ?: ""
+        httpProxyPac = parcel.readString() ?: ""
         privateKey = parcel.readString() ?: ""
     }
 
@@ -87,6 +137,10 @@ class InterfaceProxy : BaseObservable, Parcelable {
         includedApplications.addAll(other.includedApplications)
         listenPort = other.listenPort.map { it.toString() }.orElse("")
         mtu = other.mtu.map { it.toString() }.orElse("")
+        httpProxyHostname = other.httpProxy.map { if (it.getHost().startsWith('[') && it.getHost().endsWith(']')) it.getHost().substring(1, it.getHost().length-1) else it.getHost() }.orElse("")
+        httpProxyPort = other.httpProxy.map { if (it.getPort() <= 0) "8080" else it.getPort().toString() }.orElse("")
+        httpProxyPac = other.httpProxy.map { it.getPacFileUrl().toString() }.orElse("")
+        httpProxyMenu = other.httpProxy.map { if (it.getPacFileUrl() != null && it.getPacFileUrl() != Uri.EMPTY) Constants.HTTP_PROXY_PAC else if (it.getHost() != "") Constants.HTTP_PROXY_MANUAL else Constants.HTTP_PROXY_NONE }.orElse(Constants.HTTP_PROXY_NONE)
         val keyPair = other.keyPair
         privateKey = keyPair.privateKey.toBase64()
     }
@@ -111,6 +165,20 @@ class InterfaceProxy : BaseObservable, Parcelable {
         if (includedApplications.isNotEmpty()) builder.includeApplications(includedApplications)
         if (listenPort.isNotEmpty()) builder.parseListenPort(listenPort)
         if (mtu.isNotEmpty()) builder.parseMtu(mtu)
+        if (Constants.HTTP_PROXY_MANUAL.equals(httpProxyMenu) && httpProxyHostname.isNotEmpty()) {
+            var httpProxy: String
+            if (httpProxyHostname.contains(":")) {
+                httpProxy = "[" + httpProxyHostname + "]"
+            } else {
+                httpProxy = httpProxyHostname
+            }
+            if (httpProxyPort.isNotEmpty()) {
+                httpProxy += ":" + httpProxyPort;
+            }
+            builder.parseHttpProxy(httpProxy)
+        } else if (Constants.HTTP_PROXY_PAC.equals(httpProxyMenu) && httpProxyPac.isNotEmpty()) {
+            builder.parseHttpProxy("pac:" + httpProxyPac)
+        }
         if (privateKey.isNotEmpty()) builder.parsePrivateKey(privateKey)
         return builder.build()
     }
@@ -122,6 +190,10 @@ class InterfaceProxy : BaseObservable, Parcelable {
         dest.writeStringList(includedApplications)
         dest.writeString(listenPort)
         dest.writeString(mtu)
+        dest.writeString(httpProxyMenu)
+        dest.writeString(httpProxyHostname)
+        dest.writeString(httpProxyPort)
+        dest.writeString(httpProxyPac)
         dest.writeString(privateKey)
     }