android: Call the SAVE directly from the native code.

Until now, for the "local save has completed, upload it back to the
content: URI" messages we were relying on the "local save" -> JavaScript
-> Java -> "upload to content:/ URI" chain.

It turns out though, that the WebView can be dead by the time we need
the notification that the save has completed.  This was particularly
seen on ChromeOS when the document was closed using the [x] in the
window decoration.

As a solution, we need to pass the info that the "local save" has
completed directly to Java.  So far this uses the same semantics as the
postMobileMessage() and reuse its code; but maybe in the future we'll
need to split this.

Change-Id: If1b93e4f76cee3abc6aebfc3e9072810ab73bb42
Reviewed-on: https://gerrit.libreoffice.org/c/online/+/98724
Tested-by: Jan Holesovsky <kendy@collabora.com>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>

4 files changed, 52 insertions, 22 deletions

diff --git a/android/lib/src/main/cpp/androidapp.cpp b/android/lib/src/main/cpp/androidapp.cpp
index a3f8471355..f3405f3744 100644
--- a/android/lib/src/main/cpp/androidapp.cpp
+++ b/android/lib/src/main/cpp/androidapp.cpp
@@ -35,6 +35,10 @@ static int closeNotificationPipeForForwardingThread[2] = {-1, -1};
 static JavaVM* javaVM = nullptr;
 static bool lokInitialized = false;
 
+// Remember the reference to the LOActivity
+jclass g_loActivityClz = nullptr;
+jobject g_loActivityObj = nullptr;
+
 extern "C" JNIEXPORT jint JNICALL
 JNI_OnLoad(JavaVM* vm, void*) {
     javaVM = vm;
@@ -89,7 +93,7 @@ public:
     JNIEnv *getEnv() const { return _env; }
 };
 
-static void send2JS(const JNIThreadContext &jctx, jclass loActivityClz, jobject loActivityObj, const std::vector<char>& buffer)
+static void send2JS(const JNIThreadContext &jctx, const std::vector<char>& buffer)
 {
     LOG_DBG("Send to JS: " << LOOLProtocol::getAbbreviatedMessage(buffer.data(), buffer.size()));
 
@@ -149,8 +153,22 @@ static void send2JS(const JNIThreadContext &jctx, jclass loActivityClz, jobject
 
     JNIEnv *env = jctx.getEnv();
     jstring jstr = env->NewStringUTF(js.c_str());
-    jmethodID callFakeWebsocket = env->GetMethodID(loActivityClz, "callFakeWebsocketOnMessage", "(Ljava/lang/String;)V");
-    env->CallVoidMethod(loActivityObj, callFakeWebsocket, jstr);
+    jmethodID callFakeWebsocket = env->GetMethodID(g_loActivityClz, "callFakeWebsocketOnMessage", "(Ljava/lang/String;)V");
+    env->CallVoidMethod(g_loActivityObj, callFakeWebsocket, jstr);
+    env->DeleteLocalRef(jstr);
+
+    if (env->ExceptionCheck())
+        env->ExceptionDescribe();
+}
+
+void postDirectMessage(std::string message)
+{
+    JNIThreadContext ctx;
+    JNIEnv *env = ctx.getEnv();
+
+    jstring jstr = env->NewStringUTF(message.c_str());
+    jmethodID callPostMobileMessage = env->GetMethodID(g_loActivityClz, "postMobileMessage", "(Ljava/lang/String;)V");
+    env->CallVoidMethod(g_loActivityObj, callPostMobileMessage, jstr);
     env->DeleteLocalRef(jstr);
 
     if (env->ExceptionCheck())
@@ -170,7 +188,7 @@ void closeDocument()
 
 /// Handle a message from JavaScript.
 extern "C" JNIEXPORT void JNICALL
-Java_org_libreoffice_androidlib_LOActivity_postMobileMessageNative(JNIEnv *env, jobject instance, jstring message)
+Java_org_libreoffice_androidlib_LOActivity_postMobileMessageNative(JNIEnv *env, jobject, jstring message)
 {
     const char *string_value = env->GetStringUTFChars(message, nullptr);
 
@@ -197,11 +215,7 @@ Java_org_libreoffice_androidlib_LOActivity_postMobileMessageNative(JNIEnv *env,
             fakeSocketPipe2(closeNotificationPipeForForwardingThread);
 
             // Start another thread to read responses and forward them to the JavaScript
-            jclass clz = env->GetObjectClass(instance);
-            jclass loActivityClz = (jclass) env->NewGlobalRef(clz);
-            jobject loActivityObj = env->NewGlobalRef(instance);
-
-            std::thread([loActivityClz, loActivityObj, currentFakeClientFd]
+            std::thread([currentFakeClientFd]
                         {
                             Util::setThreadName("app2js");
                             JNIThreadContext ctx;
@@ -242,7 +256,7 @@ Java_org_libreoffice_androidlib_LOActivity_postMobileMessageNative(JNIEnv *env,
                                            return;
                                        std::vector<char> buf(n);
                                        n = fakeSocketRead(currentFakeClientFd, buf.data(), n);
-                                       send2JS(ctx, loActivityClz, loActivityObj, buf);
+                                       send2JS(ctx, buf);
                                    }
                                }
                                else
@@ -290,10 +304,18 @@ extern "C" jboolean libreofficekit_initialize(JNIEnv* env, jstring dataDir, jstr
 
 /// Create the LOOLWSD instance.
 extern "C" JNIEXPORT void JNICALL
-Java_org_libreoffice_androidlib_LOActivity_createLOOLWSD(JNIEnv *env, jobject, jstring dataDir, jstring cacheDir, jstring apkFile, jobject assetManager, jstring loadFileURL)
+Java_org_libreoffice_androidlib_LOActivity_createLOOLWSD(JNIEnv *env, jobject instance, jstring dataDir, jstring cacheDir, jstring apkFile, jobject assetManager, jstring loadFileURL)
 {
     fileURL = std::string(env->GetStringUTFChars(loadFileURL, nullptr));
 
+    // remember the LOActivity class and object to be able to call back
+    env->DeleteGlobalRef(g_loActivityClz);
+    env->DeleteGlobalRef(g_loActivityObj);
+
+    jclass clz = env->GetObjectClass(instance);
+    g_loActivityClz = (jclass) env->NewGlobalRef(clz);
+    g_loActivityObj = env->NewGlobalRef(instance);
+
     // already initialized?
     if (lokInitialized)
     {
@@ -335,7 +357,7 @@ Java_org_libreoffice_androidlib_LOActivity_createLOOLWSD(JNIEnv *env, jobject, j
 
 extern "C"
 JNIEXPORT void JNICALL
-Java_org_libreoffice_androidlib_LOActivity_saveAs(JNIEnv *env, jobject instance,
+Java_org_libreoffice_androidlib_LOActivity_saveAs(JNIEnv *env, jobject,
                                                   jstring fileUri_, jstring format_) {
     const char *fileUri = env->GetStringUTFChars(fileUri_, 0);
     const char *format = env->GetStringUTFChars(format_, 0);
@@ -348,7 +370,7 @@ Java_org_libreoffice_androidlib_LOActivity_saveAs(JNIEnv *env, jobject instance,
 
 extern "C"
 JNIEXPORT void JNICALL
-Java_org_libreoffice_androidlib_LOActivity_postUnoCommand(JNIEnv* pEnv, jobject instance,
+Java_org_libreoffice_androidlib_LOActivity_postUnoCommand(JNIEnv* pEnv, jobject,
                                                           jstring command, jstring arguments, jboolean bNotifyWhenFinished)
 {
     const char* pCommand = pEnv->GetStringUTFChars(command, nullptr);
@@ -382,7 +404,7 @@ const char* copyJavaString(JNIEnv* pEnv, jstring aJavaString)
 
 extern "C"
 JNIEXPORT jboolean JNICALL
-Java_org_libreoffice_androidlib_LOActivity_getClipboardContent(JNIEnv *env, jobject instance, jobject lokClipboardData)
+Java_org_libreoffice_androidlib_LOActivity_getClipboardContent(JNIEnv *env, jobject, jobject lokClipboardData)
 {
     const char** mimeTypes = nullptr;
     size_t outCount = 0;
@@ -481,7 +503,7 @@ Java_org_libreoffice_androidlib_LOActivity_getClipboardContent(JNIEnv *env, jobj
 
 extern "C"
 JNIEXPORT void JNICALL
-Java_org_libreoffice_androidlib_LOActivity_setClipboardContent(JNIEnv *env, jobject instance, jobject lokClipboardData) {
+Java_org_libreoffice_androidlib_LOActivity_setClipboardContent(JNIEnv *env, jobject, jobject lokClipboardData) {
     jclass class_ArrayList= env->FindClass("java/util/ArrayList");
     jmethodID methodId_ArrayList_ToArray = env->GetMethodID(class_ArrayList, "toArray", "()[Ljava/lang/Object;");
 
@@ -527,7 +549,7 @@ Java_org_libreoffice_androidlib_LOActivity_setClipboardContent(JNIEnv *env, jobj
 
 extern "C"
 JNIEXPORT void JNICALL
-Java_org_libreoffice_androidlib_LOActivity_paste(JNIEnv *env, jobject instance, jstring inMimeType, jbyteArray inData) {
+Java_org_libreoffice_androidlib_LOActivity_paste(JNIEnv *env, jobject, jstring inMimeType, jbyteArray inData) {
     const char* mimeType = env->GetStringUTFChars(inMimeType, nullptr);
 
     size_t dataArrayLength = env->GetArrayLength(inData);
diff --git a/android/lib/src/main/cpp/androidapp.hpp b/android/lib/src/main/cpp/androidapp.hpp
index 59a9faa5b6..ef48bf137e 100644
--- a/android/lib/src/main/cpp/androidapp.hpp
+++ b/android/lib/src/main/cpp/androidapp.hpp
@@ -9,4 +9,7 @@
 
 extern int loolwsd_server_socket_fd;
 
+/** Equivalent of postMobileMessage(), but called directly from the native code. */
+void postDirectMessage(std::string message);
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/kit/ChildSession.cpp b/kit/ChildSession.cpp
index 4b27da4c85..b11763a05e 100644
--- a/kit/ChildSession.cpp
+++ b/kit/ChildSession.cpp
@@ -36,6 +36,10 @@
 #import "DocumentViewController.h"
 #endif
 
+#ifdef __ANDROID__
+#include <androidapp.hpp>
+#endif
+
 #include <common/FileUtil.hpp>
 #include <common/JsonUtil.hpp>
 #include <common/Authorization.hpp>
@@ -2471,7 +2475,7 @@ void ChildSession::loKitCallback(const int type, const std::string& payload)
         break;
     case LOK_CALLBACK_UNO_COMMAND_RESULT:
         sendTextFrame("unocommandresult: " + payload);
-#ifdef IOS
+#if MOBILEAPP
         {
             // After the document has been saved (into the temporary copy that we set up in
             // -[CODocument loadFromContents:ofType:error:]), save it also using the system API so
@@ -2486,6 +2490,7 @@ void ChildSession::loKitCallback(const int type, const std::string& payload)
 
             if (!commandName.isEmpty() && commandName.toString() == ".uno:Save" && !success.isEmpty() && success.toString() == "true")
             {
+#ifdef IOS
                 CODocument *document = [[DocumentViewController singleton] document];
 
                 [document saveToURL:[document fileURL]
@@ -2493,6 +2498,10 @@ void ChildSession::loKitCallback(const int type, const std::string& payload)
                  completionHandler:^(BOOL success) {
                         LOG_TRC("ChildSession::loKitCallback() save completion handler gets " << (success?"YES":"NO"));
                     }];
+#endif
+#ifdef __ANDROID__
+                postDirectMessage("SAVE " + payload);
+#endif
             }
         }
 #endif
diff --git a/loleaflet/src/control/Control.Toolbar.js b/loleaflet/src/control/Control.Toolbar.js
index 500ca36b51..62ecd991b9 100644
--- a/loleaflet/src/control/Control.Toolbar.js
+++ b/loleaflet/src/control/Control.Toolbar.js
@@ -936,11 +936,7 @@ function onCommandResult(e) {
 			postMessageObj['result'] = e.result && e.result.value;
 		}
 
-		if (window.ThisIsTheAndroidApp) {
-			window.postMobileMessage('SAVE ' + JSON.stringify(postMessageObj));
-		} else {
-			map.fire('postMessage', {msgId: 'Action_Save_Resp', args: postMessageObj});
-		}
+		map.fire('postMessage', {msgId: 'Action_Save_Resp', args: postMessageObj});
 	}
 	else if ((commandName === '.uno:Undo' || commandName === '.uno:Redo') &&
 		e.success === true && e.result.value && !isNaN(e.result.value)) { /*UNDO_CONFLICT*/