Remodel the Model

- The configuration and crypto model is now entirely independent
of Android classes other than Nullable and TextUtils.
- Model classes are immutable and use builders that enforce the
appropriate optional/required attributes.
- The Android config proxies (for Parcelable and databinding) are
moved to the Android side of the codebase, and are designed to be
safe for two-way databinding. This allows proper observability in
TunnelDetailFragment.
- Various robustness fixes and documentation updates to helper classes.

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

6 files changed, 29 insertions, 32 deletions

diff --git a/app/src/main/res/layout/tunnel_detail_fragment.xml b/app/src/main/res/layout/tunnel_detail_fragment.xml
index 11cfafae..9b06ddd4 100644
--- a/app/src/main/res/layout/tunnel_detail_fragment.xml
+++ b/app/src/main/res/layout/tunnel_detail_fragment.xml
@@ -19,7 +19,7 @@
 
         <variable
             name="config"
-            type="com.wireguard.config.Config.Observable" />
+            type="com.wireguard.config.Config" />
     </data>
 
     <ScrollView
@@ -102,7 +102,7 @@
                         android:ellipsize="end"
                         android:maxLines="1"
                         android:onClick="@{ClipboardUtils::copyTextView}"
-                        android:text="@{config.interfaceSection.publicKey}" />
+                        android:text="@{config.interface.keyPair.publicKey.toBase64}" />
 
                     <TextView
                         android:id="@+id/addresses_label"
@@ -120,7 +120,7 @@
                         android:layout_height="wrap_content"
                         android:layout_below="@+id/addresses_label"
                         android:contentDescription="@string/addresses"
-                        android:text="@{config.interfaceSection.addresses}" />
+                        android:text="@{config.interface.addresses}" />
                 </RelativeLayout>
             </android.support.v7.widget.CardView>
 
diff --git a/app/src/main/res/layout/tunnel_detail_peer.xml b/app/src/main/res/layout/tunnel_detail_peer.xml
index 91be0011..767e0383 100644
--- a/app/src/main/res/layout/tunnel_detail_peer.xml
+++ b/app/src/main/res/layout/tunnel_detail_peer.xml
@@ -8,7 +8,7 @@
 
         <variable
             name="item"
-            type="com.wireguard.config.Peer.Observable" />
+            type="com.wireguard.config.Peer" />
     </data>
 
     <android.support.v7.widget.CardView
@@ -54,7 +54,7 @@
                 android:ellipsize="end"
                 android:maxLines="1"
                 android:onClick="@{ClipboardUtils::copyTextView}"
-                android:text="@{item.publicKey}" />
+                android:text="@{item.publicKey.toBase64}" />
 
             <TextView
                 android:id="@+id/allowed_ips_label"
@@ -71,7 +71,7 @@
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_below="@+id/allowed_ips_label"
-                android:text="@{item.allowedIPs}" />
+                android:text="@{item.allowedIps}" />
 
             <TextView
                 android:id="@+id/endpoint_label"
diff --git a/app/src/main/res/layout/tunnel_editor_fragment.xml b/app/src/main/res/layout/tunnel_editor_fragment.xml
index f7976459..3945fffc 100644
--- a/app/src/main/res/layout/tunnel_editor_fragment.xml
+++ b/app/src/main/res/layout/tunnel_editor_fragment.xml
@@ -11,15 +11,17 @@
 
         <import type="com.wireguard.android.widget.NameInputFilter" />
 
-        <import type="com.wireguard.config.Peer" />
-
         <variable
             name="fragment"
             type="com.wireguard.android.fragment.TunnelEditorFragment" />
 
         <variable
             name="config"
-            type="com.wireguard.config.Config.Observable" />
+            type="com.wireguard.android.viewmodel.ConfigProxy" />
+
+        <variable
+            name="name"
+            type="String" />
     </data>
 
     <android.support.design.widget.CoordinatorLayout
@@ -76,7 +78,7 @@
                             android:layout_height="wrap_content"
                             android:layout_below="@+id/interface_name_label"
                             android:inputType="textNoSuggestions|textVisiblePassword"
-                            android:text="@={config.name}"
+                            android:text="@={name}"
                             app:filter="@{NameInputFilter.newInstance()}" />
 
                         <TextView
@@ -96,7 +98,7 @@
                             android:layout_toStartOf="@+id/generate_private_key_button"
                             android:contentDescription="@string/public_key_description"
                             android:inputType="textNoSuggestions|textVisiblePassword"
-                            android:text="@={config.interfaceSection.privateKey}"
+                            android:text="@={config.interface.privateKey}"
                             app:filter="@{KeyInputFilter.newInstance()}" />
 
                         <Button
@@ -107,7 +109,7 @@
                             android:layout_alignBottom="@id/private_key_text"
                             android:layout_alignParentEnd="true"
                             android:layout_below="@+id/private_key_label"
-                            android:onClick="@{() -> config.interfaceSection.generateKeypair()}"
+                            android:onClick="@{() -> config.interface.generateKeyPair()}"
                             android:text="@string/generate" />
 
                         <TextView
@@ -130,7 +132,7 @@
                             android:hint="@string/hint_generated"
                             android:maxLines="1"
                             android:onClick="@{ClipboardUtils::copyTextView}"
-                            android:text="@{config.interfaceSection.publicKey}" />
+                            android:text="@{config.interface.publicKey}" />
 
                         <TextView
                             android:id="@+id/addresses_label"
@@ -150,7 +152,7 @@
                             android:layout_below="@+id/addresses_label"
                             android:layout_toStartOf="@+id/listen_port_text"
                             android:inputType="textNoSuggestions|textVisiblePassword"
-                            android:text="@={config.interfaceSection.addresses}" />
+                            android:text="@={config.interface.addresses}" />
 
                         <TextView
                             android:id="@+id/listen_port_label"
@@ -171,7 +173,7 @@
                             android:layout_alignStart="@+id/generate_private_key_button"
                             android:hint="@string/hint_random"
                             android:inputType="number"
-                            android:text="@={config.interfaceSection.listenPort}"
+                            android:text="@={config.interface.listenPort}"
                             android:textAlignment="center" />
 
                         <TextView
@@ -192,7 +194,7 @@
                             android:layout_below="@+id/dns_servers_label"
                             android:layout_toStartOf="@+id/mtu_text"
                             android:inputType="textNoSuggestions|textVisiblePassword"
-                            android:text="@={config.interfaceSection.dnses}" />
+                            android:text="@={config.interface.dnsServers}" />
 
                         <TextView
                             android:id="@+id/mtu_label"
@@ -213,7 +215,7 @@
                             android:layout_alignStart="@+id/generate_private_key_button"
                             android:hint="@string/hint_automatic"
                             android:inputType="number"
-                            android:text="@={config.interfaceSection.mtu}"
+                            android:text="@={config.interface.mtu}"
                             android:textAlignment="center" />
 
                         <Button
@@ -224,7 +226,7 @@
                             android:layout_below="@+id/dns_servers_text"
                             android:layout_marginLeft="-8dp"
                             android:onClick="@{fragment::onRequestSetExcludedApplications}"
-                            android:text="@{@plurals/set_excluded_applications(config.interfaceSection.excludedApplicationsCount, config.interfaceSection.excludedApplicationsCount)}" />
+                            android:text="@{@plurals/set_excluded_applications(config.interface.excludedApplications.size, config.interface.excludedApplications.size)}" />
                     </RelativeLayout>
                 </android.support.v7.widget.CardView>
 
@@ -244,7 +246,7 @@
                     android:layout_marginBottom="4dp"
                     android:layout_marginEnd="4dp"
                     android:layout_marginStart="4dp"
-                    android:onClick="@{() -> config.peers.add(Peer.Observable.newInstance())}"
+                    android:onClick="@{() -> config.addPeer()}"
                     android:text="@string/add_peer" />
             </LinearLayout>
         </ScrollView>
diff --git a/app/src/main/res/layout/tunnel_editor_peer.xml b/app/src/main/res/layout/tunnel_editor_peer.xml
index e270b71a..1224ddd3 100644
--- a/app/src/main/res/layout/tunnel_editor_peer.xml
+++ b/app/src/main/res/layout/tunnel_editor_peer.xml
@@ -10,11 +10,11 @@
 
         <variable
             name="collection"
-            type="android.databinding.ObservableList&lt;com.wireguard.config.Peer.Observable&gt;" />
+            type="android.databinding.ObservableList&lt;com.wireguard.android.viewmodel.PeerProxy&gt;" />
 
         <variable
             name="item"
-            type="com.wireguard.config.Peer.Observable" />
+            type="com.wireguard.android.viewmodel.PeerProxy" />
     </data>
 
     <android.support.v7.widget.CardView
@@ -52,7 +52,7 @@
                 android:layout_alignParentTop="true"
                 android:background="@null"
                 android:contentDescription="@string/delete"
-                android:onClick="@{() -> collection.remove(item)}"
+                android:onClick="@{() -> item.unbind()}"
                 android:src="@drawable/ic_action_delete" />
 
             <TextView
@@ -104,10 +104,9 @@
                 android:layout_height="wrap_content"
                 android:layout_alignBaseline="@+id/allowed_ips_label"
                 android:layout_alignParentEnd="true"
-                android:checked="@{item.isExcludePrivateIPsOn}"
-                android:onClick="@{() -> item.toggleExcludePrivateIPs()}"
+                android:checked="@={item.excludingPrivateIps}"
                 android:text="@string/exclude_private_ips"
-                android:visibility="@{item.canToggleExcludePrivateIPs ? View.VISIBLE : View.GONE}" />
+                android:visibility="@{item.ableToExcludePrivateIps ? View.VISIBLE : View.GONE}" />
 
             <EditText
                 android:id="@+id/allowed_ips_text"
@@ -115,7 +114,7 @@
                 android:layout_height="wrap_content"
                 android:layout_below="@+id/allowed_ips_label"
                 android:inputType="textNoSuggestions|textVisiblePassword"
-                android:text="@={item.allowedIPs}" />
+                android:text="@={item.allowedIps}" />
 
             <TextView
                 android:id="@+id/endpoint_label"
diff --git a/app/src/main/res/layout/tunnel_list_fragment.xml b/app/src/main/res/layout/tunnel_list_fragment.xml
index ccc1c5ae..d255005a 100644
--- a/app/src/main/res/layout/tunnel_list_fragment.xml
+++ b/app/src/main/res/layout/tunnel_list_fragment.xml
@@ -84,7 +84,7 @@
                 app:srcCompat="@drawable/ic_action_open_white" />
 
             <com.wireguard.android.widget.fab.LabeledFloatingActionButton
-                android:id="@+id/scan_qr_code"
+                android:id="@+id/create_from_qrcode"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:onClick="@{fragment::onRequestScanQRCode}"
@@ -101,6 +101,5 @@
                 app:fab_title="@string/create_empty"
                 app:srcCompat="@drawable/ic_action_edit_white" />
         </com.wireguard.android.widget.fab.FloatingActionsMenu>
-
     </android.support.design.widget.CoordinatorLayout>
 </layout>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 87ea18f5..6202ee78 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -63,6 +63,7 @@
     <string name="log_export_summary">Log file will be saved to downloads folder</string>
     <string name="mtu">MTU</string>
     <string name="name">Name</string>
+    <string name="parse_error">Cannot parse “%s” at %s</string>
     <string name="peer">Peer</string>
     <string name="permission_label">control WireGuard tunnels</string>
     <string name="permission_description">Allows an app to control WireGuard tunnels. Apps with this permission may enable and disable WireGuard tunnels at will, potentially misdirecting Internet traffic.</string>
@@ -99,13 +100,9 @@
     <string name="tunnel_rename_success">Successfully renamed tunnel to “%s”</string>
     <string name="tunnel_error_invalid_name">Invalid name</string>
     <string name="tunnel_error_already_exists">Tunnel %s already exists</string>
-    <string name="tunnel_error_empty_inetaddress">Empty address</string>
     <string name="tunnel_error_empty_interface_address">Address is empty</string>
-    <string name="tunnel_error_interface_parse_failed">Unable to parse line: “%s”</string>
     <string name="tunnel_error_forbidden_endpoint_chars">Forbidden characters in endpoint</string>
     <string name="tunnel_error_empty_peer_public_key">Peer public key may not be empty</string>
-    <string name="tunnel_error_invalid_config_line">Invalid configuration line: %s</string>
-    <string name="tunnel_error_no_config_information">Could not find any config information</string>
     <string name="key_length_base64_exception_message">WireGuard base64 keys must be 44 characters encoding 32 bytes</string>
     <string name="key_length_exception_message">WireGuard keys must be 32 bytes</string>
     <string name="key_length_hex_exception_message">WireGuard hex keys must be 64 characters encoding 32 bytes</string>