Import&export of hosts and port forwards using Gson

[Craeckie]

Fixes #527 and #922.

The hosts and port forwards are exported to the clipboard in json format. This does not include any keys.

The class HostExport is a crude workaround. Currently there is no Object-Oriented data structure that maps port forwards to hosts. If someone is willing to refactor the existing code, this class could be removed. This workaround was the simplest way I found to serialize all hosts with their respective port forwards.

[CLAassistant]

All committers have signed the CLA.

[Naramsim]

Any news?

[dakusan]

+1

[felfert]

PLEASE somebody review this! This is such a useful feature.

[winice-test]

Thanks for this enhancement. But I found some other potential issues with this change. I have some scripts in postLogin. I can export it to clipboard. But import always fails. Here is the log for example I set "postLogin":"ssh test"

08-21 11:02:03.311 12318 12318 E MessageQueue-JNI: com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unexpected value at line 1 column 117 path $[0].host.postLogin
08-21 11:02:03.311 12318 12318 E MessageQueue-JNI: at com.google.gson.Gson.fromJson(SourceFile:0)
08-21 11:02:03.311 12318 12318 E MessageQueue-JNI: at com.google.gson.Gson.fromJson(SourceFile:0)
08-21 11:02:03.311 12318 12318 E MessageQueue-JNI: at com.google.gson.Gson.fromJson(SourceFile:0)
08-21 11:02:03.311 12318 12318 E MessageQueue-JNI: at org.connectbot.HostListActivity$6.onMenuItemClick(Unknown Source:60)
08-21 11:02:03.311 12318 12318 E MessageQueue-JNI: at androidx.appcompat.view.menu.MenuItemImpl.invoke(Unknown Source:5)
08-21 11:02:03.311 12318 12318 E MessageQueue-JNI: at androidx.appcompat.view.menu.MenuBuilder.performItemAction(SourceFile:0)

[7wells]

Hello!

Is there anything that I as humble user can do to support this update getting implemented?