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>

5 files changed, 146 insertions, 5 deletions

diff --git a/ui/src/main/res/layout/http_proxy_menu_item.xml b/ui/src/main/res/layout/http_proxy_menu_item.xml
new file mode 100644
index 00000000..8ad5c026
--- /dev/null
+++ b/ui/src/main/res/layout/http_proxy_menu_item.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:padding="16dp"
+    android:ellipsize="end"
+    android:maxLines="1"
+/>
diff --git a/ui/src/main/res/layout/tunnel_detail_fragment.xml b/ui/src/main/res/layout/tunnel_detail_fragment.xml
index 7a962509..6892b988 100644
--- a/ui/src/main/res/layout/tunnel_detail_fragment.xml
+++ b/ui/src/main/res/layout/tunnel_detail_fragment.xml
@@ -5,6 +5,8 @@
 
     <data>
 
+        <import type="android.os.Build" />
+
         <import type="com.wireguard.android.backend.Tunnel.State" />
 
         <import type="com.wireguard.android.util.ClipboardUtils" />
@@ -273,6 +275,33 @@
                         tools:text="1500" />
 
                     <TextView
+                        android:id="@+id/http_proxy_label"
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="8dp"
+                        android:labelFor="@+id/http_proxy_text"
+                        android:text="@string/http_proxy"
+                        android:visibility="@{(Build.VERSION.SDK_INT &lt; Build.VERSION_CODES.Q || !config.interface.httpProxy.isPresent()) ? android.view.View.GONE : android.view.View.VISIBLE}"
+                        app:layout_constraintStart_toStartOf="parent"
+                        app:layout_constraintTop_toBottomOf="@id/listen_port_text" />
+
+                    <TextView
+                        android:id="@+id/http_proxy_text"
+                        style="@style/DetailText"
+                        android:layout_width="0dp"
+                        android:layout_height="wrap_content"
+                        android:contentDescription="@string/http_proxy"
+                        android:nextFocusUp="@id/listen_port_text"
+                        android:nextFocusDown="@id/applications_text"
+                        android:nextFocusForward="@id/applications_text"
+                        android:onClick="@{ClipboardUtils::copyTextView}"
+                        android:text="@{config.interface.httpProxy}"
+                        android:visibility="@{(Build.VERSION.SDK_INT &lt; Build.VERSION_CODES.Q || !config.interface.httpProxy.isPresent()) ? android.view.View.GONE : android.view.View.VISIBLE}"
+                        app:layout_constraintStart_toStartOf="parent"
+                        app:layout_constraintTop_toBottomOf="@+id/http_proxy_label"
+                        tools:text="http://example.com:8888" />
+
+                    <TextView
                         android:id="@+id/applications_label"
                         android:layout_width="match_parent"
                         android:layout_height="wrap_content"
diff --git a/ui/src/main/res/layout/tunnel_editor_fragment.xml b/ui/src/main/res/layout/tunnel_editor_fragment.xml
index 59572b32..789c839b 100644
--- a/ui/src/main/res/layout/tunnel_editor_fragment.xml
+++ b/ui/src/main/res/layout/tunnel_editor_fragment.xml
@@ -5,6 +5,8 @@
 
     <data>
 
+        <import type="android.os.Build" />
+
         <import type="com.wireguard.android.util.ClipboardUtils" />
 
         <import type="com.wireguard.android.widget.KeyInputFilter" />
@@ -210,7 +212,7 @@
                                 android:imeOptions="actionNext"
                                 android:inputType="textNoSuggestions|textVisiblePassword"
                                 android:nextFocusUp="@id/addresses_label_text"
-                                android:nextFocusDown="@id/set_excluded_applications"
+                                android:nextFocusDown="@id/http_proxy_hostname_text"
                                 android:nextFocusForward="@id/mtu_text"
                                 android:text="@={config.interface.dnsServers}" />
                         </com.google.android.material.textfield.TextInputLayout>
@@ -235,19 +237,112 @@
                                 android:imeOptions="actionDone"
                                 android:inputType="number"
                                 android:nextFocusUp="@id/listen_port_text"
-                                android:nextFocusDown="@id/set_excluded_applications"
-                                android:nextFocusForward="@id/set_excluded_applications"
+                                android:nextFocusDown="@id/http_proxy_hostname_text"
+                                android:nextFocusForward="@id/http_proxy_hostname_text"
                                 android:text="@={config.interface.mtu}"
                                 android:textAlignment="center" />
                         </com.google.android.material.textfield.TextInputLayout>
 
+                        <com.google.android.material.textfield.TextInputLayout
+                            android:id="@+id/http_proxy_menu"
+                            style="@style/ExposedDropDownMenu"
+                            android:layout_width="0dp"
+                            android:layout_height="wrap_content"
+                            android:layout_margin="4dp"
+                            android:hint="@string/http_proxy"
+                            app:expandedHintEnabled="false"
+                            app:layout_constraintEnd_toEndOf="parent"
+                            app:layout_constraintStart_toStartOf="parent"
+                            app:layout_constraintTop_toBottomOf="@id/dns_servers_label_layout">
+
+                                <com.google.android.material.textfield.MaterialAutoCompleteTextView
+                                    android:layout_width="match_parent"
+                                    android:layout_height="wrap_content"
+                                    android:inputType="none"
+                                    android:text="@={config.interface.httpProxyMenu}"
+                                />
+                        </com.google.android.material.textfield.TextInputLayout>
+
+                        <com.google.android.material.textfield.TextInputLayout
+                            android:id="@+id/http_proxy_hostname_label_layout"
+                            android:layout_width="0dp"
+                            android:layout_height="wrap_content"
+                            android:layout_margin="4dp"
+                            android:hint="@string/http_proxy_hostname"
+                            android:visibility="@{config.interface.httpProxyManualVisibility}"
+                            app:layout_constraintEnd_toStartOf="@id/http_proxy_port_label_layout"
+                            app:layout_constraintHorizontal_chainStyle="spread"
+                            app:layout_constraintHorizontal_weight="0.7"
+                            app:layout_constraintStart_toStartOf="parent"
+                            app:layout_constraintTop_toBottomOf="@id/http_proxy_menu">
+
+                            <com.google.android.material.textfield.TextInputEditText
+                                android:id="@+id/http_proxy_hostname_text"
+                                android:layout_width="match_parent"
+                                android:layout_height="wrap_content"
+                                android:imeOptions="actionNext"
+                                android:inputType="textNoSuggestions|textVisiblePassword"
+                                android:nextFocusUp="@id/mtu_text"
+                                android:nextFocusDown="@id/set_excluded_applications"
+                                android:nextFocusForward="@id/http_proxy_port_text"
+                                android:text="@={config.interface.httpProxyHostname}" />
+                        </com.google.android.material.textfield.TextInputLayout>
+
+                        <com.google.android.material.textfield.TextInputLayout
+                            android:id="@+id/http_proxy_port_label_layout"
+                            android:layout_width="0dp"
+                            android:layout_height="wrap_content"
+                            android:layout_margin="4dp"
+                            android:hint="@string/http_proxy_port"
+                            android:visibility="@{config.interface.httpProxyManualVisibility}"
+                            app:expandedHintEnabled="false"
+                            app:layout_constraintEnd_toEndOf="parent"
+                            app:layout_constraintHorizontal_weight="0.3"
+                            app:layout_constraintStart_toEndOf="@id/http_proxy_hostname_label_layout"
+                            app:layout_constraintTop_toBottomOf="@id/http_proxy_menu">
+
+                            <com.google.android.material.textfield.TextInputEditText
+                                android:id="@+id/http_proxy_port_text"
+                                android:layout_width="match_parent"
+                                android:layout_height="wrap_content"
+                                android:imeOptions="actionDone"
+                                android:nextFocusUp="@id/mtu_text"
+                                android:nextFocusDown="@id/http_proxy_pac_label_layout"
+                                android:nextFocusForward="@id/http_proxy_pac_label_layout"
+                                android:text="@={config.interface.httpProxyPort}"
+                                android:textAlignment="center" />
+                        </com.google.android.material.textfield.TextInputLayout>
+
+                        <com.google.android.material.textfield.TextInputLayout
+                            android:id="@+id/http_proxy_pac_label_layout"
+                            android:layout_width="0dp"
+                            android:layout_height="wrap_content"
+                            android:layout_margin="4dp"
+                            android:hint="@string/http_proxy_pac"
+                            android:visibility="@{config.interface.httpProxyPacVisibility}"
+                            app:layout_constraintEnd_toEndOf="parent"
+                            app:layout_constraintStart_toStartOf="parent"
+                            app:layout_constraintTop_toBottomOf="@id/http_proxy_hostname_label_layout">
+
+                            <com.google.android.material.textfield.TextInputEditText
+                                android:id="@+id/http_proxy_pac_text"
+                                android:layout_width="match_parent"
+                                android:layout_height="wrap_content"
+                                android:imeOptions="actionNext"
+                                android:inputType="textNoSuggestions|textVisiblePassword"
+                                android:nextFocusUp="@id/http_proxy_hostname_text"
+                                android:nextFocusDown="@id/set_excluded_applications"
+                                android:nextFocusForward="@id/set_excluded_applications"
+                                android:text="@={config.interface.httpProxyPac}" />
+                        </com.google.android.material.textfield.TextInputLayout>
+
                         <com.google.android.material.button.MaterialButton
                             android:id="@+id/set_excluded_applications"
                             style="@style/Widget.MaterialComponents.Button.TextButton"
                             android:layout_width="0dp"
                             android:layout_height="wrap_content"
                             android:layout_margin="4dp"
-                            android:nextFocusUp="@id/dns_servers_text"
+                            android:nextFocusUp="@id/http_proxy_hostname_text"
                             android:nextFocusDown="@id/peers_layout"
                             android:nextFocusForward="@id/peers_layout"
                             android:onClick="@{fragment::onRequestSetExcludedIncludedApplications}"
@@ -256,7 +351,7 @@
                             app:layout_constraintBottom_toBottomOf="parent"
                             app:layout_constraintEnd_toEndOf="parent"
                             app:layout_constraintStart_toStartOf="parent"
-                            app:layout_constraintTop_toBottomOf="@id/mtu_label_layout"
+                            app:layout_constraintTop_toBottomOf="@id/http_proxy_pac_label_layout"
                             app:rippleColor="?attr/colorSecondary"
                             tools:text="4 excluded applications" />
                     </androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/ui/src/main/res/values/strings.xml b/ui/src/main/res/values/strings.xml
index 6c090199..c10c4ea7 100644
--- a/ui/src/main/res/values/strings.xml
+++ b/ui/src/main/res/values/strings.xml
@@ -70,6 +70,7 @@
     <string name="bad_config_explanation_pka">: Must be positive and no more than 65535</string>
     <string name="bad_config_explanation_positive_number">: Must be positive</string>
     <string name="bad_config_explanation_udp_port">: Must be a valid UDP port number</string>
+    <string name="bad_config_explanation_http_proxy">: Must be valid proxy hostname and port</string>
     <string name="bad_config_reason_invalid_key">Invalid key</string>
     <string name="bad_config_reason_invalid_number">Invalid number</string>
     <string name="bad_config_reason_invalid_value">Invalid value</string>
@@ -126,6 +127,10 @@
     <string name="hint_optional">(optional)</string>
     <string name="hint_optional_discouraged">(optional, not recommended)</string>
     <string name="hint_random">(random)</string>
+    <string name="http_proxy">Proxy</string>
+    <string name="http_proxy_hostname">Proxy hostname</string>
+    <string name="http_proxy_pac">Proxy Auto-Config URL</string>
+    <string name="http_proxy_port">Proxy port</string>
     <string name="illegal_filename_error">Illegal file name “%s”</string>
     <string name="import_error">Unable to import tunnel: %s</string>
     <string name="import_from_qr_code">Import Tunnel from QR Code</string>
diff --git a/ui/src/main/res/values/styles.xml b/ui/src/main/res/values/styles.xml
index 396f156c..da3c2cb7 100644
--- a/ui/src/main/res/values/styles.xml
+++ b/ui/src/main/res/values/styles.xml
@@ -61,4 +61,8 @@
     <style name="ThemeOverlay.AppTheme.TextInputEditText.OutlinedBox" parent="ThemeOverlay.MaterialComponents.TextInputEditText.OutlinedBox">
         <item name="colorControlActivated">@color/color_control_normal</item>
     </style>
+
+    <style name="ExposedDropDownMenu" parent="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox.ExposedDropdownMenu">
+        <item name="boxStrokeColor">?attr/colorSecondary</item>
+    </style>
 </resources>