juicysfplugin/modules/juce_gui_basics/native/juce_android_ContentSharer.cpp

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 5 End-User License
   Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
   27th April 2017).

   End User License Agreement: www.juce.com/juce-5-licence
   Privacy Policy: www.juce.com/juce-5-privacy-policy

   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/
namespace juce
{

//==============================================================================
// This byte-code is generated from native/javacore/app/com/roli/juce/JuceSharingContentProvider.java with min sdk version 16
// See juce_core/native/java/README.txt on how to generate this byte-code.
static const uint8 javaJuceSharingContentProvider[] =
{31,139,8,8,143,106,229,91,0,3,74,117,99,101,83,104,97,114,105,110,103,67,111,110,116,101,110,116,80,114,111,118,105,100,
101,114,46,100,101,120,0,149,151,93,108,20,85,20,199,207,157,153,157,253,236,178,91,170,20,145,178,229,83,80,216,242,165,
96,5,11,45,72,183,91,139,161,52,218,190,56,221,157,148,129,221,153,101,102,118,133,23,2,106,162,209,196,24,125,64,19,73,
48,33,106,140,15,36,26,227,131,49,152,24,163,241,65,77,148,248,160,209,152,152,24,193,68,227,131,6,37,241,127,63,118,219,
173,197,232,194,111,238,185,231,156,123,238,185,231,222,153,206,148,237,19,137,190,173,219,105,239,208,216,231,67,47,106,
177,200,154,39,135,207,172,189,226,63,113,230,173,189,99,175,63,244,123,185,131,168,70,68,39,38,182,117,146,250,157,79,
17,141,146,212,223,4,46,48,34,110,252,3,109,4,237,103,26,209,82,222,71,171,163,189,132,203,80,156,40,103,16,125,111,18,
253,4,126,6,191,129,107,224,58,232,137,18,245,130,53,96,3,216,2,14,131,6,120,25,188,11,190,1,191,128,100,140,104,19,112,
192,235,224,50,184,6,110,193,28,187,192,3,192,6,117,240,52,120,6,60,15,206,130,115,224,101,240,10,120,3,188,9,222,6,159,
128,175,192,183,224,42,136,38,136,214,129,33,48,5,60,240,8,56,5,206,130,87,193,69,240,54,120,31,124,12,62,5,95,130,31,
192,21,240,43,248,19,24,73,162,197,96,57,88,5,242,224,78,176,27,12,131,7,65,9,56,224,56,56,9,78,129,199,192,83,0,101,37,
148,142,16,138,208,37,148,159,176,45,148,6,139,64,6,100,73,238,193,98,208,165,246,229,102,176,4,116,147,220,143,91,193,
106,176,134,228,190,240,223,195,168,189,166,228,10,228,152,154,235,4,100,148,65,236,231,105,165,71,233,233,89,200,248,47,
108,252,23,83,50,247,143,170,60,94,48,229,92,205,3,179,92,201,231,249,62,43,249,53,200,43,148,124,17,242,42,37,191,11,
121,165,146,63,130,220,171,228,47,32,231,148,252,181,41,215,177,120,78,14,93,42,135,4,170,181,85,212,42,69,247,137,122,
201,126,82,245,83,168,214,157,196,215,28,19,99,13,172,176,143,248,154,22,137,190,9,253,58,17,51,45,250,9,81,105,222,74,
125,2,255,214,171,120,36,218,36,109,16,109,156,238,17,241,101,220,20,42,113,187,104,53,186,67,180,58,109,20,45,163,77,
202,190,89,180,81,218,34,90,131,182,171,252,250,213,184,93,162,53,105,183,26,191,71,237,253,1,177,231,49,149,151,172,185,
169,106,193,247,171,15,157,109,50,61,113,94,178,170,70,77,251,0,236,35,202,158,82,118,109,142,253,32,236,211,202,206,245,
157,144,187,83,179,114,111,74,158,201,13,41,238,31,17,250,231,146,114,142,41,198,168,150,211,104,128,38,53,126,66,117,
120,242,179,118,46,41,207,137,151,209,225,127,8,91,89,235,139,146,198,210,34,119,83,248,92,104,197,208,97,53,104,32,50,
169,105,136,17,129,149,231,117,49,41,215,121,8,241,107,227,113,210,54,167,17,139,137,92,222,73,202,181,214,50,60,183,149,
168,79,45,195,207,253,84,198,16,59,25,17,167,154,232,189,164,90,7,246,155,199,229,249,125,152,148,117,24,239,53,104,57,
171,245,165,104,139,145,162,30,150,197,222,247,176,117,34,183,152,152,39,78,186,170,212,103,173,56,89,68,150,119,211,229,
57,58,77,100,133,103,86,83,151,153,157,239,251,121,243,117,252,203,124,166,26,115,37,41,239,233,241,45,24,163,241,49,131,
145,20,237,128,159,155,225,51,165,88,143,150,101,157,184,222,118,189,3,215,117,76,222,227,89,17,167,19,126,188,202,140,
174,183,205,221,48,121,5,111,60,119,68,172,33,158,154,173,89,206,160,182,223,29,243,250,59,230,245,121,55,138,168,89,220,
161,186,144,179,226,94,213,148,28,17,109,151,208,102,91,122,93,84,47,218,58,151,89,209,231,232,170,205,170,216,252,126,
202,42,61,151,155,177,179,202,175,139,204,123,28,215,9,119,19,27,38,99,184,88,44,82,132,95,139,196,10,180,162,80,47,217,
135,142,88,190,227,206,12,122,110,104,187,225,65,223,107,56,101,219,223,116,212,106,88,196,138,164,193,85,231,254,102,81,
252,168,183,104,185,101,223,115,202,249,146,28,146,159,55,180,159,86,220,200,101,194,170,212,237,160,159,214,255,195,193,
183,131,252,158,32,176,195,253,78,197,30,178,131,146,239,212,66,15,177,150,182,92,203,86,104,77,91,129,157,31,172,251,
129,215,54,77,203,52,106,133,190,115,162,233,144,109,57,184,118,152,63,236,59,115,195,121,65,158,207,53,54,29,216,126,
131,103,221,59,215,116,208,242,75,118,101,126,50,59,139,37,175,154,247,189,138,147,63,138,210,229,111,92,191,213,77,161,
153,203,189,255,127,104,123,122,27,254,115,128,126,90,89,44,91,149,134,115,44,111,185,174,23,90,161,227,185,249,125,110,
169,226,5,220,187,98,5,216,131,158,5,124,134,93,23,25,75,123,239,2,246,81,187,58,173,28,248,54,118,22,249,41,201,87,44,
119,38,63,54,125,212,46,133,237,186,67,33,207,174,159,210,237,197,160,174,133,86,72,108,130,244,137,97,156,184,137,2,25,
19,5,33,225,236,77,20,113,112,39,138,5,28,92,126,29,38,54,73,139,167,22,152,37,105,149,74,118,16,236,175,88,51,1,69,248,
98,109,74,150,188,74,189,234,222,111,85,237,128,150,170,195,198,171,214,204,101,144,187,149,169,167,205,52,55,173,125,13,
168,105,89,155,253,62,59,196,164,182,85,29,63,89,67,220,155,218,140,99,53,219,229,1,168,179,77,253,64,221,246,79,146,89,
182,43,118,104,83,196,22,97,151,204,216,225,66,39,141,210,51,237,83,68,209,231,18,25,71,188,32,164,56,191,142,123,135,
177,66,211,113,145,104,72,70,197,43,29,35,163,106,5,199,40,93,117,170,54,119,71,212,16,149,53,170,94,25,67,93,84,129,98,
158,59,136,184,200,33,234,185,114,113,29,30,82,110,221,124,240,104,174,192,168,89,225,17,74,212,124,143,239,45,14,0,69,
142,203,101,224,118,173,87,144,71,128,229,72,75,71,75,220,227,163,254,113,212,54,28,243,203,124,246,240,136,19,144,201,
175,171,251,200,172,215,202,124,118,189,238,59,252,82,161,72,131,63,21,200,20,77,64,155,244,3,219,215,71,211,27,119,109,
164,187,40,154,222,53,73,203,140,3,219,7,118,72,213,42,173,111,32,154,158,196,147,24,38,178,244,194,208,190,104,154,30,
99,90,97,39,20,14,205,176,2,250,227,90,97,20,205,16,156,168,170,21,238,22,166,134,20,138,58,254,116,108,156,26,193,147,
119,36,50,178,103,104,223,126,97,157,50,10,163,34,150,214,193,70,186,83,90,90,91,107,100,239,94,114,75,83,88,166,45,98,
35,183,106,221,137,238,36,105,26,195,159,238,103,115,145,211,167,141,75,49,237,81,141,76,246,93,140,171,53,174,142,157,
57,109,60,30,103,80,39,216,133,56,49,35,110,104,73,232,46,9,93,147,69,236,199,56,99,127,129,139,9,198,62,0,95,129,171,
224,124,146,177,31,193,75,41,249,110,75,234,89,222,108,155,223,30,252,57,223,252,254,208,105,246,27,196,160,217,239,16,
222,54,191,69,76,154,253,30,209,51,82,230,127,207,88,78,190,75,15,64,54,115,82,207,223,161,88,70,190,103,139,119,228,156,
156,151,127,191,232,202,159,191,243,24,57,57,31,127,47,34,53,86,188,123,101,100,174,252,91,233,111,138,244,241,33,100,13,
0,0};

//==============================================================================
#define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD, CALLBACK) \
 FIELD (authority, "authority", "Ljava/lang/String;")

DECLARE_JNI_CLASS (AndroidProviderInfo, "android/content/pm/ProviderInfo")
#undef JNI_CLASS_MEMBERS

#define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD, CALLBACK) \
 METHOD (constructor,       "<init>",            "(Landroid/os/ParcelFileDescriptor;JJ)V") \
 METHOD (createInputStream, "createInputStream", "()Ljava/io/FileInputStream;") \
 METHOD (getLength,         "getLength",         "()J")

DECLARE_JNI_CLASS (AssetFileDescriptor, "android/content/res/AssetFileDescriptor")
#undef JNI_CLASS_MEMBERS

#define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD, CALLBACK) \
 METHOD (close, "close", "()V")

DECLARE_JNI_CLASS (JavaCloseable, "java/io/Closeable")
#undef JNI_CLASS_MEMBERS

#define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD, CALLBACK) \
 STATICMETHOD (open, "open", "(Ljava/io/File;I)Landroid/os/ParcelFileDescriptor;")

DECLARE_JNI_CLASS (ParcelFileDescriptor, "android/os/ParcelFileDescriptor")
#undef JNI_CLASS_MEMBERS

//==============================================================================
class AndroidContentSharerCursor
{
public:
    class Owner
    {
    public:
        virtual ~Owner() {}

        virtual void cursorClosed (const AndroidContentSharerCursor&) = 0;
    };

    AndroidContentSharerCursor (Owner& ownerToUse, JNIEnv* env,
                                const LocalRef<jobject>& contentProvider,
                                const LocalRef<jobjectArray>& resultColumns)
        : owner (ownerToUse),
          cursor (GlobalRef (LocalRef<jobject> (env->NewObject (JuceContentProviderCursor,
                                                                JuceContentProviderCursor.constructor,
                                                                contentProvider.get(),
                                                                reinterpret_cast<jlong> (this),
                                                                resultColumns.get()))))
    {
        // the content provider must be created first
        jassert (contentProvider.get() != 0);
    }

    jobject getNativeCursor() { return cursor.get(); }

    void cursorClosed()
    {
        MessageManager::callAsync ([this] { owner.cursorClosed (*this); });
    }

    void addRow (LocalRef<jobjectArray>& values)
    {
        auto* env = getEnv();

        env->CallVoidMethod (cursor.get(), JuceContentProviderCursor.addRow, values.get());
    }

private:
    Owner& owner;
    GlobalRef cursor;

    //==============================================================================
    #define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD, CALLBACK) \
     METHOD (addRow,      "addRow", "([Ljava/lang/Object;)V") \
     METHOD (constructor, "<init>", "(Lcom/roli/juce/JuceSharingContentProvider;J[Ljava/lang/String;)V") \
     CALLBACK (contentSharerCursorClosed, "contentSharerCursorClosed", "(J)V") \

    DECLARE_JNI_CLASS (JuceContentProviderCursor, "com/roli/juce/JuceSharingContentProvider$ProviderCursor")
    #undef JNI_CLASS_MEMBERS

    static void JNICALL contentSharerCursorClosed(JNIEnv*, jobject, jlong host)
    {
        if (auto* myself = reinterpret_cast<AndroidContentSharerCursor*> (host))
            myself->cursorClosed();
    }
};

AndroidContentSharerCursor::JuceContentProviderCursor_Class AndroidContentSharerCursor::JuceContentProviderCursor;

//==============================================================================
class AndroidContentSharerFileObserver
{
public:
    class Owner
    {
    public:
        virtual ~Owner() {}

        virtual void fileHandleClosed (const AndroidContentSharerFileObserver&) = 0;
    };

    AndroidContentSharerFileObserver (Owner& ownerToUse, JNIEnv* env,
                                      const LocalRef<jobject>& contentProvider,
                                      const String& filepathToUse)
        : owner (ownerToUse),
          filepath (filepathToUse),
          fileObserver (GlobalRef (LocalRef<jobject> (env->NewObject (JuceContentProviderFileObserver,
                                                                      JuceContentProviderFileObserver.constructor,
                                                                      contentProvider.get(),
                                                                      reinterpret_cast<jlong> (this),
                                                                      javaString (filepath).get(),
                                                                      open | access | closeWrite | closeNoWrite))))
    {
        // the content provider must be created first
        jassert (contentProvider.get() != 0);

        env->CallVoidMethod (fileObserver, JuceContentProviderFileObserver.startWatching);
    }

    void onFileEvent (int event, const LocalRef<jstring>& path)
    {
        ignoreUnused (path);

        if (event == open)
        {
            ++numOpenedHandles;
        }
        else if (event == access)
        {
            fileWasRead = true;
        }
        else if (event == closeNoWrite || event == closeWrite)
        {
            --numOpenedHandles;

            // numOpenedHandles may get negative if we don't receive open handle event.
            if (fileWasRead && numOpenedHandles <= 0)
            {
                MessageManager::callAsync ([this]
                {
                    getEnv()->CallVoidMethod (fileObserver, JuceContentProviderFileObserver.stopWatching);
                    owner.fileHandleClosed (*this);
                });
            }
        }
    }

private:
    static constexpr int open = 32;
    static constexpr int access = 1;
    static constexpr int closeWrite = 8;
    static constexpr int closeNoWrite = 16;

    bool fileWasRead = false;
    int numOpenedHandles = 0;

    Owner& owner;
    String filepath;
    GlobalRef fileObserver;

    //==============================================================================
    #define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD, CALLBACK) \
     METHOD (constructor,   "<init>",        "(Lcom/roli/juce/JuceSharingContentProvider;JLjava/lang/String;I)V") \
     METHOD (startWatching, "startWatching", "()V") \
     METHOD (stopWatching,  "stopWatching",  "()V") \
     CALLBACK (contentSharerFileObserverEvent, "contentSharerFileObserverEvent", "(JILjava/lang/String;)V") \

    DECLARE_JNI_CLASS (JuceContentProviderFileObserver, "com/roli/juce/JuceSharingContentProvider$ProviderFileObserver")
    #undef JNI_CLASS_MEMBERS

    static void JNICALL contentSharerFileObserverEvent (JNIEnv*, jobject /*fileObserver*/, jlong host, int event, jstring path)
    {
        if (auto* myself = reinterpret_cast<AndroidContentSharerFileObserver*> (host))
            myself->onFileEvent (event, LocalRef<jstring> (path));
    }
};

AndroidContentSharerFileObserver::JuceContentProviderFileObserver_Class AndroidContentSharerFileObserver::JuceContentProviderFileObserver;

//==============================================================================
class AndroidContentSharerPrepareFilesThread    : private Thread
{
public:
    AndroidContentSharerPrepareFilesThread (AsyncUpdater& ownerToUse,
                                            const Array<URL>& fileUrlsToUse,
                                            const String& packageNameToUse,
                                            const String& uriBaseToUse)
        : Thread ("AndroidContentSharerPrepareFilesThread"),
          owner (ownerToUse),
          fileUrls (fileUrlsToUse),
          resultFileUris (GlobalRef (LocalRef<jobject> (getEnv()->NewObject (JavaArrayList,
                                                                             JavaArrayList.constructor,
                                                                             fileUrls.size())))),
          packageName (packageNameToUse),
          uriBase (uriBaseToUse)
    {
        startThread();
    }

    ~AndroidContentSharerPrepareFilesThread()
    {
        signalThreadShouldExit();
        waitForThreadToExit (10000);

        for (auto& f : temporaryFilesFromAssetFiles)
            f.deleteFile();
    }

    jobject getResultFileUris()  { return resultFileUris.get(); }
    const StringArray& getMimeTypes() const { return mimeTypes; }
    const StringArray& getFilePaths() const { return filePaths; }

private:
    struct StreamCloser
    {
        StreamCloser (const LocalRef<jobject>& streamToUse)
            : stream (GlobalRef (streamToUse))
        {
        }

        ~StreamCloser()
        {
            if (stream.get() != 0)
                getEnv()->CallVoidMethod (stream, JavaCloseable.close);
        }

        GlobalRef stream;
    };

    void run() override
    {
        auto* env = getEnv();

        bool canSpecifyMimeTypes = true;

        for (auto f : fileUrls)
        {
            auto scheme = f.getScheme();

            // Only "file://" scheme or no scheme (for files in app bundle) are allowed!
            jassert (scheme.isEmpty() || scheme == "file");

            if (scheme.isEmpty())
            {
                // Raw resource names need to be all lower case
                jassert (f.toString (true).toLowerCase() == f.toString (true));

                // This will get us a file with file:// URI
                f = copyAssetFileToTemporaryFile (env, f.toString (true));

                if (f.isEmpty())
                    continue;
            }

            if (threadShouldExit())
                return;

            auto filepath = URL::removeEscapeChars (f.toString (true).fromFirstOccurrenceOf ("file://", false, false));

            filePaths.add (filepath);

            auto filename = filepath.fromLastOccurrenceOf ("/", false, true);
            auto fileExtension = filename.fromLastOccurrenceOf (".", false, true);
            auto contentString = uriBase + String (filePaths.size() - 1) + "/" + filename;

            auto uri = LocalRef<jobject> (env->CallStaticObjectMethod (AndroidUri, AndroidUri.parse,
                                                                       javaString (contentString).get()));

            if (canSpecifyMimeTypes)
                canSpecifyMimeTypes = fileExtension.isNotEmpty();

            if (canSpecifyMimeTypes)
                mimeTypes.addArray (getMimeTypesForFileExtension (fileExtension));
            else
                mimeTypes.clear();

            env->CallBooleanMethod (resultFileUris, JavaArrayList.add, uri.get());
        }

        owner.triggerAsyncUpdate();
    }

    URL copyAssetFileToTemporaryFile (JNIEnv* env, const String& filename)
    {
        auto resources = LocalRef<jobject> (env->CallObjectMethod (getAppContext().get(), AndroidContext.getResources));
        int fileId = env->CallIntMethod (resources, AndroidResources.getIdentifier, javaString (filename).get(),
                                         javaString ("raw").get(), javaString (packageName).get());

        // Raw resource not found. Please make sure that you include your file as a raw resource
        // and that you specify just the file name, without an extension.
        jassert (fileId != 0);

        if (fileId == 0)
            return {};

        auto assetFd = LocalRef<jobject> (env->CallObjectMethod (resources,
                                                                 AndroidResources.openRawResourceFd,
                                                                 fileId));

        auto inputStream = StreamCloser (LocalRef<jobject> (env->CallObjectMethod (assetFd,
                                                                                   AssetFileDescriptor.createInputStream)));

        if (jniCheckHasExceptionOccurredAndClear())
        {
            // Failed to open file stream for resource
            jassertfalse;
            return {};
        }

        auto tempFile = File::createTempFile ({});
        tempFile.createDirectory();
        tempFile = tempFile.getChildFile (filename);

        auto outputStream = StreamCloser (LocalRef<jobject> (env->NewObject (JavaFileOutputStream,
                                                                             JavaFileOutputStream.constructor,
                                                                             javaString (tempFile.getFullPathName()).get())));

        if (jniCheckHasExceptionOccurredAndClear())
        {
            // Failed to open file stream for temporary file
            jassertfalse;
            return {};
        }

        auto buffer = LocalRef<jbyteArray> (env->NewByteArray (1024));
        int bytesRead = 0;

        for (;;)
        {
            if (threadShouldExit())
                return {};

            bytesRead = env->CallIntMethod (inputStream.stream, JavaFileInputStream.read, buffer.get());

            if (jniCheckHasExceptionOccurredAndClear())
            {
                // Failed to read from resource file.
                jassertfalse;
                return {};
            }

            if (bytesRead < 0)
                break;

            env->CallVoidMethod (outputStream.stream, JavaFileOutputStream.write, buffer.get(), 0, bytesRead);

            if (jniCheckHasExceptionOccurredAndClear())
            {
                // Failed to write to temporary file.
                jassertfalse;
                return {};
            }
        }

        temporaryFilesFromAssetFiles.add (tempFile);

        return URL (tempFile);
    }

    AsyncUpdater& owner;
    Array<URL> fileUrls;

    GlobalRef resultFileUris;
    String packageName;
    String uriBase;

    StringArray filePaths;
    Array<File> temporaryFilesFromAssetFiles;
    StringArray mimeTypes;
};

//==============================================================================
class ContentSharer::ContentSharerNativeImpl  : public ContentSharer::Pimpl,
                                                public AndroidContentSharerFileObserver::Owner,
                                                public AndroidContentSharerCursor::Owner,
                                                public AsyncUpdater,
                                                private Timer
{
public:
    ContentSharerNativeImpl (ContentSharer& cs)
        : owner (cs),
          packageName (juceString (LocalRef<jstring> ((jstring) getEnv()->CallObjectMethod (getAppContext().get(), AndroidContext.getPackageName)))),
          uriBase ("content://" + packageName + ".sharingcontentprovider/")
    {
    }

    ~ContentSharerNativeImpl()
    {
        masterReference.clear();
    }

    void shareFiles (const Array<URL>& files) override
    {
        if (! isContentSharingEnabled())
        {
            // You need to enable "Content Sharing" in Projucer's Android exporter.
            jassertfalse;
            owner.sharingFinished (false, {});
        }

        prepareFilesThread.reset (new AndroidContentSharerPrepareFilesThread (*this, files, packageName, uriBase));
    }

    void shareText (const String& text) override
    {
        if (! isContentSharingEnabled())
        {
            // You need to enable "Content Sharing" in Projucer's Android exporter.
            jassertfalse;
            owner.sharingFinished (false, {});
        }

        auto* env = getEnv();

        auto intent = LocalRef<jobject> (env->NewObject (AndroidIntent, AndroidIntent.constructor));
        env->CallObjectMethod (intent, AndroidIntent.setAction,
                               javaString ("android.intent.action.SEND").get());
        env->CallObjectMethod (intent, AndroidIntent.putExtra,
                               javaString ("android.intent.extra.TEXT").get(),
                               javaString (text).get());
        env->CallObjectMethod (intent, AndroidIntent.setType, javaString ("text/plain").get());

        auto chooserIntent = LocalRef<jobject> (env->CallStaticObjectMethod (AndroidIntent, AndroidIntent.createChooser,
                                                                             intent.get(), javaString ("Choose share target").get()));

        WeakReference<ContentSharerNativeImpl> weakRef (this);

        startAndroidActivityForResult (chooserIntent, 1003,
                                       [weakRef] (int /*requestCode*/, int resultCode, LocalRef<jobject> /*intentData*/) mutable
                                       {
                                           if (weakRef != nullptr)
                                               weakRef->sharingFinished (resultCode);
                                       });
    }

    //==============================================================================
    void cursorClosed (const AndroidContentSharerCursor& cursor) override
    {
        cursors.removeObject (&cursor);
    }

    void fileHandleClosed (const AndroidContentSharerFileObserver&) override
    {
        decrementPendingFileCountAndNotifyOwnerIfReady();
    }

    //==============================================================================
    jobject openFile (const LocalRef<jobject>& contentProvider,
                    const LocalRef<jobject>& uri, const LocalRef<jstring>& mode)
    {
        ignoreUnused (mode);

        WeakReference<ContentSharerNativeImpl> weakRef (this);

        if (weakRef == nullptr)
            return nullptr;

        auto* env = getEnv();

        auto uriElements = getContentUriElements (env, uri);

        if (uriElements.filepath.isEmpty())
            return nullptr;

        return getAssetFileDescriptor (env, contentProvider, uriElements.filepath);
    }

    jobject query (const LocalRef<jobject>& contentProvider, const LocalRef<jobject>& uri,
                 const LocalRef<jobjectArray>& projection, const LocalRef<jobject>& selection,
                 const LocalRef<jobjectArray>& selectionArgs, const LocalRef<jobject>& sortOrder)
    {
        ignoreUnused (selection, selectionArgs, sortOrder);

        StringArray requestedColumns = javaStringArrayToJuce (projection);
        StringArray supportedColumns = getSupportedColumns();

        StringArray resultColumns;

        for (const auto& col : supportedColumns)
        {
            if (requestedColumns.contains (col))
                resultColumns.add (col);
        }

        // Unsupported columns were queried, file sharing may fail.
        if (resultColumns.isEmpty())
            return nullptr;

        auto resultJavaColumns = juceStringArrayToJava (resultColumns);

        auto* env = getEnv();

        auto cursor = cursors.add (new AndroidContentSharerCursor (*this, env, contentProvider,
                                                                   resultJavaColumns));

        auto uriElements = getContentUriElements (env, uri);

        if (uriElements.filepath.isEmpty())
            return cursor->getNativeCursor();

        auto values = LocalRef<jobjectArray> (env->NewObjectArray ((jsize) resultColumns.size(),
                                                                   JavaObject, 0));

        for (int i = 0; i < resultColumns.size(); ++i)
        {
            if (resultColumns.getReference (i) == "_display_name")
            {
                env->SetObjectArrayElement (values, i, javaString (uriElements.filename).get());
            }
            else if (resultColumns.getReference (i) == "_size")
            {
                auto javaFile = LocalRef<jobject> (env->NewObject (JavaFile, JavaFile.constructor,
                                                                   javaString (uriElements.filepath).get()));

                jlong fileLength = env->CallLongMethod (javaFile, JavaFile.length);

                env->SetObjectArrayElement (values, i, env->NewObject (JavaLong,
                                                                       JavaLong.constructor,
                                                                       fileLength));
            }
        }

        cursor->addRow (values);
        return cursor->getNativeCursor();
    }

    jobjectArray getStreamTypes (const LocalRef<jobject>& uri, const LocalRef<jstring>& mimeTypeFilter)
    {
        auto* env = getEnv();

        auto extension = getContentUriElements (env, uri).filename.fromLastOccurrenceOf (".", false, true);

        if (extension.isEmpty())
            return nullptr;

        return juceStringArrayToJava (filterMimeTypes (getMimeTypesForFileExtension (extension),
                                                                  juceString (mimeTypeFilter.get())));
    }

    void sharingFinished (int resultCode)
    {
        sharingActivityDidFinish = true;

        succeeded = resultCode == -1;

        // Give content sharer a chance to request file access.
        if (nonAssetFilesPendingShare.get() == 0)
            startTimer (2000);
        else
            notifyOwnerIfReady();
    }

private:
    bool isContentSharingEnabled() const
    {
        auto* env = getEnv();

        LocalRef<jobject> packageManager (env->CallObjectMethod (getAppContext().get(), AndroidContext.getPackageManager));

        constexpr int getProviders = 8;
        auto packageInfo = LocalRef<jobject> (env->CallObjectMethod (packageManager,
                                                                     AndroidPackageManager.getPackageInfo,
                                                                     javaString (packageName).get(),
                                                                     getProviders));
        auto providers = LocalRef<jobjectArray> ((jobjectArray) env->GetObjectField (packageInfo,
                                                                                     AndroidPackageInfo.providers));

        if (providers == nullptr)
            return false;

        auto sharingContentProviderAuthority = packageName + ".sharingcontentprovider";
        const int numProviders = env->GetArrayLength (providers.get());

        for (int i = 0; i < numProviders; ++i)
        {
            auto providerInfo = LocalRef<jobject> (env->GetObjectArrayElement (providers, i));
            auto authority = LocalRef<jstring> ((jstring) env->GetObjectField (providerInfo,
                                                                               AndroidProviderInfo.authority));

            if (juceString (authority) == sharingContentProviderAuthority)
                return true;
        }

        return false;
    }

    void handleAsyncUpdate() override
    {
        jassert (prepareFilesThread != nullptr);

        if (prepareFilesThread == nullptr)
            return;

        filesPrepared (prepareFilesThread->getResultFileUris(), prepareFilesThread->getMimeTypes());
    }

    void filesPrepared (jobject fileUris, const StringArray& mimeTypes)
    {
        auto* env = getEnv();

        auto intent = LocalRef<jobject> (env->NewObject (AndroidIntent, AndroidIntent.constructor));
        env->CallObjectMethod (intent, AndroidIntent.setAction,
                               javaString ("android.intent.action.SEND_MULTIPLE").get());

        env->CallObjectMethod (intent, AndroidIntent.setType,
                               javaString (getCommonMimeType (mimeTypes)).get());

        constexpr int grantReadPermission = 1;
        env->CallObjectMethod (intent, AndroidIntent.setFlags, grantReadPermission);

        env->CallObjectMethod (intent, AndroidIntent.putParcelableArrayListExtra,
                               javaString ("android.intent.extra.STREAM").get(),
                               fileUris);

        auto chooserIntent = LocalRef<jobject> (env->CallStaticObjectMethod (AndroidIntent,
                                                                             AndroidIntent.createChooser,
                                                                             intent.get(),
                                                                             javaString ("Choose share target").get()));
        WeakReference<ContentSharerNativeImpl> weakRef (this);

        startAndroidActivityForResult (chooserIntent, 1003,
                                       [weakRef] (int /*requestCode*/, int resultCode, LocalRef<jobject> /*intentData*/) mutable
                                       {
                                           if (weakRef != nullptr)
                                               weakRef->sharingFinished (resultCode);
                                       });
    }

    void decrementPendingFileCountAndNotifyOwnerIfReady()
    {
        --nonAssetFilesPendingShare;

        notifyOwnerIfReady();
    }

    void notifyOwnerIfReady()
    {
        if (sharingActivityDidFinish && nonAssetFilesPendingShare.get() == 0)
            owner.sharingFinished (succeeded, {});
    }

    void timerCallback() override
    {
        stopTimer();

        notifyOwnerIfReady();
    }

    //==============================================================================
    struct ContentUriElements
    {
        String index;
        String filename;
        String filepath;
    };

    ContentUriElements getContentUriElements (JNIEnv* env, const LocalRef<jobject>& uri) const
    {
        jassert (prepareFilesThread != nullptr);

        if (prepareFilesThread == nullptr)
            return {};

        auto fullUri = juceString ((jstring) env->CallObjectMethod (uri.get(), AndroidUri.toString));

        auto index = fullUri.fromFirstOccurrenceOf (uriBase, false, false)
                             .upToFirstOccurrenceOf ("/", false, true);

        auto filename = fullUri.fromLastOccurrenceOf ("/", false, true);

        return { index, filename, prepareFilesThread->getFilePaths()[index.getIntValue()] };
    }

    static StringArray getSupportedColumns()
    {
        return StringArray ("_display_name", "_size");
    }

    jobject getAssetFileDescriptor (JNIEnv* env, const LocalRef<jobject>& contentProvider,
                                  const String& filepath)
    {
        // This function can be called from multiple threads.
        {
            const ScopedLock sl (nonAssetFileOpenLock);

            if (! nonAssetFilePathsPendingShare.contains (filepath))
            {
                nonAssetFilePathsPendingShare.add (filepath);
                ++nonAssetFilesPendingShare;

                nonAssetFileObservers.add (new AndroidContentSharerFileObserver (*this, env,
                                                                                 contentProvider,
                                                                                 filepath));
            }
        }

        auto javaFile = LocalRef<jobject> (env->NewObject (JavaFile, JavaFile.constructor,
                                                           javaString (filepath).get()));

        constexpr int modeReadOnly = 268435456;
        auto parcelFileDescriptor = LocalRef<jobject> (env->CallStaticObjectMethod (ParcelFileDescriptor,
                                                                                    ParcelFileDescriptor.open,
                                                                                    javaFile.get(), modeReadOnly));

        if (jniCheckHasExceptionOccurredAndClear())
        {
            // Failed to create file descriptor. Have you provided a valid file path/resource name?
            jassertfalse;
            return nullptr;
        }

        jlong startOffset = 0;
        jlong unknownLength = -1;

        assetFileDescriptors.add (GlobalRef (LocalRef<jobject> (env->NewObject (AssetFileDescriptor,
                                                                                AssetFileDescriptor.constructor,
                                                                                parcelFileDescriptor.get(),
                                                                                startOffset, unknownLength))));

        return assetFileDescriptors.getReference (assetFileDescriptors.size() - 1).get();
    }

    ContentSharer& owner;
    String packageName;
    String uriBase;

    std::unique_ptr<AndroidContentSharerPrepareFilesThread> prepareFilesThread;

    bool succeeded = false;
    String errorDescription;

    bool sharingActivityDidFinish = false;

    OwnedArray<AndroidContentSharerCursor> cursors;

    Array<GlobalRef> assetFileDescriptors;

    CriticalSection nonAssetFileOpenLock;
    StringArray nonAssetFilePathsPendingShare;
    Atomic<int> nonAssetFilesPendingShare { 0 };
    OwnedArray<AndroidContentSharerFileObserver> nonAssetFileObservers;

    WeakReference<ContentSharerNativeImpl>::Master masterReference;
    friend class WeakReference<ContentSharerNativeImpl>;

    //==============================================================================
    #define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD, CALLBACK) \
     CALLBACK (contentSharerQuery,          "contentSharerQuery",          "(Landroid/net/Uri;[Ljava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)Landroid/database/Cursor;") \
     CALLBACK (contentSharerOpenFile,       "contentSharerOpenFile",       "(Landroid/net/Uri;Ljava/lang/String;)Landroid/content/res/AssetFileDescriptor;") \
     CALLBACK (contentSharerGetStreamTypes, "contentSharerGetStreamTypes", "(Landroid/net/Uri;Ljava/lang/String;)[Ljava/lang/String;") \


    DECLARE_JNI_CLASS_WITH_BYTECODE (JuceSharingContentProvider, "com/roli/juce/JuceSharingContentProvider", 16, javaJuceSharingContentProvider, sizeof(javaJuceSharingContentProvider))
    #undef JNI_CLASS_MEMBERS

    static jobject JNICALL contentSharerQuery (JNIEnv*, jobject contentProvider, jobject uri, jobjectArray projection,
                                               jobject selection, jobjectArray selectionArgs, jobject sortOrder)
    {
        if (auto *pimpl = (ContentSharer::ContentSharerNativeImpl *) ContentSharer::getInstance ()->pimpl.get ())
            return pimpl->query (LocalRef<jobject> (static_cast<jobject> (contentProvider)),
                                 LocalRef<jobject> (static_cast<jobject> (uri)),
                                 LocalRef<jobjectArray> (
                                         static_cast<jobjectArray> (projection)),
                                 LocalRef<jobject> (static_cast<jobject> (selection)),
                                 LocalRef<jobjectArray> (
                                         static_cast<jobjectArray> (selectionArgs)),
                                 LocalRef<jobject> (static_cast<jobject> (sortOrder)));

        return nullptr;
    }

    static jobject JNICALL contentSharerOpenFile (JNIEnv*, jobject contentProvider, jobject uri, jstring mode)
    {
        if (auto* pimpl = (ContentSharer::ContentSharerNativeImpl*) ContentSharer::getInstance()->pimpl.get())
            return pimpl->openFile (LocalRef<jobject> (static_cast<jobject> (contentProvider)),
                                    LocalRef<jobject> (static_cast<jobject> (uri)),
                                    LocalRef<jstring> (static_cast<jstring> (mode)));

        return nullptr;
    }

    static jobjectArray JNICALL contentSharerGetStreamTypes (JNIEnv*, jobject /*contentProvider*/, jobject uri, jstring mimeTypeFilter)
    {
        if (auto* pimpl = (ContentSharer::ContentSharerNativeImpl*) ContentSharer::getInstance()->pimpl.get())
            return pimpl->getStreamTypes (LocalRef<jobject> (static_cast<jobject> (uri)),
                                          LocalRef<jstring> (static_cast<jstring> (mimeTypeFilter)));

        return nullptr;
    }
};

//==============================================================================
ContentSharer::Pimpl* ContentSharer::createPimpl()
{
    return new ContentSharerNativeImpl (*this);
}

ContentSharer::ContentSharerNativeImpl::JuceSharingContentProvider_Class ContentSharer::ContentSharerNativeImpl::JuceSharingContentProvider;

} // namespace juce