dc/237 encrypt large file

[cdawei]

Pull Request Details

What issue does this PR address

• Encrypt chunks of large file and its representing .ttl file

• Link to associated issue: SOLID POD: Support encryption / decryption in sendLargeFile / getLargeFile #237

Checklist

Complete the check-list below to ensure your branch is ready for PR.

Flutter Style Guide: https://survivor.togaware.com/gnulinux/flutter-style.html

• Screenshots included in linked issue
• Changes adhere to the team style and coding guideline
• No confidential information
• No duplicated content
• No lint check errors related to your changes (make prep or flutter analyze lib)
• Pre-exisiting lint errors noted: [HERE]
• Tested on at least one device
  • Android Phone
  • Android Emulator
  • Chrome on Android
  • Chrome
  • iOS
  • Linux
  • MacOS
  • Windows
• Added 2 reviewers (or 1 for private repositories then they add another)

Finalising

Once PR discussion is complete and 2 reviewers have approved:

• Merge dev into the branch
• Resolve any conflicts
• Add one line summary into CHANGELOG.md
• Bump appropriate version number in pubspec.yaml
• Push to git repository and review
• Merge PR into dev

[cdawei]

Please use the same test as shown in #186

Note that:

• Chunks of the large file is now encrypted using AES, the encryption key and IV is stored in exampleApp/data/large_file.bin.ttl
• The content of exampleApp/data/large_file.bin.ttl is also encrypted, its encryption key (encrypted using master key) and IV is stored in exampleApp/encryption/ind-keys.ttl

[anushkavidanage]

Thanks Dawei. Works great in Windows. One thing I noticed is that for Android the download function does not work. Uploading and deleting works for Android. We might need another task to tackle this.

[anushkavidanage]

Error I am getting.

D/AndroidRuntime( 5479): Shutting down VM
E/AndroidRuntime( 5479): FATAL EXCEPTION: main
E/AndroidRuntime( 5479): Process: com.togaware.demopod, PID: 5479
E/AndroidRuntime( 5479): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=55226, result=-1, data=Intent { dat=content://com.android.externalstorage.documents/... flg=0x43 }} to activity {com.togaware.demopod/com.togaware.demopod.MainActivity}: java.lang.NullPointerException: Attempt to get length of null array
E/AndroidRuntime( 5479): 	at android.app.ActivityThread.deliverResults(ActivityThread.java:5654)
E/AndroidRuntime( 5479): 	at android.app.ActivityThread.handleSendResult(ActivityThread.java:5693)
E/AndroidRuntime( 5479): 	at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:67)
E/AndroidRuntime( 5479): 	at android.app.servertransaction.ActivityTransactionItem.execute(ActivityTransactionItem.java:45)
E/AndroidRuntime( 5479): 	at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:139)
E/AndroidRuntime( 5479): 	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:96)
E/AndroidRuntime( 5479): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2547)
E/AndroidRuntime( 5479): 	at android.os.Handler.dispatchMessage(Handler.java:111)
E/AndroidRuntime( 5479): 	at android.os.Looper.loopOnce(Looper.java:242)
E/AndroidRuntime( 5479): 	at android.os.Looper.loop(Looper.java:362)
E/AndroidRuntime( 5479): 	at android.app.ActivityThread.main(ActivityThread.java:8393)
E/AndroidRuntime( 5479): 	at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 5479): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:552)
E/AndroidRuntime( 5479): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:992)
E/AndroidRuntime( 5479): Caused by: java.lang.NullPointerException: Attempt to get length of null array
E/AndroidRuntime( 5479): 	at java.io.FileOutputStream.write(FileOutputStream.java:384)
E/AndroidRuntime( 5479): 	at com.mr.flutter.plugin.filepicker.FilePickerDelegate.onActivityResult(FilePickerDelegate.java:96)
E/AndroidRuntime( 5479): 	at io.flutter.embedding.engine.FlutterEngineConnectionRegistry$FlutterEngineActivityPluginBinding.onActivityResult(FlutterEngineConnectionRegistry.java:774)
E/AndroidRuntime( 5479): 	at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.onActivityResult(FlutterEngineConnectionRegistry.java:422)
E/AndroidRuntime( 5479): 	at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onActivityResult(FlutterActivityAndFragmentDelegate.java:964)
E/AndroidRuntime( 5479): 	at io.flutter.embedding.android.FlutterActivity.onActivityResult(FlutterActivity.java:911)
E/AndroidRuntime( 5479): 	at android.app.Activity.dispatchActivityResult(Activity.java:9086)
E/AndroidRuntime( 5479): 	at android.app.ActivityThread.deliverResults(ActivityThread.java:5647)
E/AndroidRuntime( 5479): 	... 13 more
I/Process ( 5479): Sending signal. PID: 5479 SIG: 9

[cdawei]

Thanks Dawei. Works great in Windows. One thing I noticed is that for Android the download function does not work. Uploading and deleting works for Android. We might need another task to tackle this.

Thanks Anushka. I created a new issue #239 for this task.

[cdawei]

E/AndroidRuntime( 5479): at com.mr.flutter.plugin.filepicker.FilePickerDelegate.onActivityResult(FilePickerDelegate.java:96)

A similar issue was reported in the flutter_file_picker package github repository miguelpruivo/flutter_file_picker#1604
It seems the issue has been fixed in version 8.1.3 and demopod was using 8.0.0+1.

I've just updated demopod to use the latest flutter_file_picker (version 8.1.5). It would be great if @anushkavidanage could do another test on the android phone and see if the downloading works. Thanks.

[cdawei]

According to Anushka, when trying to built the demopod on Android, got the following error:

AppData\Local\Pub\Cache\hosted\pub.dev\file_picker-8.1.5\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:257: error: cannot find symbol
        if (registrar != null) {
            ^
  symbol:   variable registrar
  location: class FilePickerPlugin

AppData\Local\Pub\Cache\hosted\pub.dev\file_picker-8.1.5\android\src\main\java\com\mr\flutter\plugin\filepicker\FilePickerPlugin.java:260: error: cannot find symbol
            registrar.addActivityResultListener(this.delegate);
            ^
  symbol:   variable registrar
  location: class FilePickerPlugin
2 errors

It seems someone has reported this on GitHub here miguelpruivo/flutter_file_picker#1645
And a pull request to fix this issue is pending review by the flutter_file_picker package developers miguelpruivo/flutter_file_picker#1643

We may try this branch of the package for now and revert back to the official version once it fixes the issue.

[anushkavidanage]

Since we need to explore a bit more into this issue, I suggest we merge this, release a new version for solidpod and then work on this issue in another branch.