How to create own .torrent file without any external tools and using only BT lib

[vikulin]

How to create own .torrent file without any external tools and using only BT lib. It would be great if anyone could add such example code.

[IriaSomobu]

Same question here. Found #92 so far, but that one about seeding, not torrent creation.

[atomashpolskiy]

Not possible atm, so you'll need to use an external tool. PRs welcome!

[IriaSomobu]

Found SO question, but generated file makes BT stop work with following error:

bt.BtException: Validation failed for torrent metainfo:
1. Standard torrent model: [properties are required: [announce, info]]
2. Standalone info dictionary model: [properties are mutually exclusive: [[length], [files]]; properties are required: [length, files]; properties are required: [piece length, pieces]]
	at bt.metainfo.MetadataService.buildTorrent(MetadataService.java:124)
	at bt.metainfo.MetadataService.fromUrl(MetadataService.java:90)
	at bt.TorrentClientBuilder.fetchTorrentFromUrl(TorrentClientBuilder.java:277)
	at bt.TorrentClientBuilder.lambda$buildProcessingContext$0(TorrentClientBuilder.java:237)
	at bt.processor.torrent.FetchTorrentStage.doExecute(FetchTorrentStage.java:36)
	at bt.processor.torrent.FetchTorrentStage.doExecute(FetchTorrentStage.java:25)
	at bt.processor.TerminateOnErrorProcessingStage.doExecute(TerminateOnErrorProcessingStage.java:38)
	at bt.processor.RoutingProcessingStage.execute(RoutingProcessingStage.java:39)
	at bt.processor.ChainProcessor.doExecute(ChainProcessor.java:112)
	at bt.processor.ChainProcessor.executeStage(ChainProcessor.java:96)
	at bt.processor.ChainProcessor.lambda$process$0(ChainProcessor.java:81)
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1626)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

UPD: qBittorrent successfully parses this generated file

[atomashpolskiy]

We're being conservative over the format of metainfo and validate against the following schema: bt-core/src/main/resources/metainfo.yml.

Perhaps, we can relax the requirement for the announce key to be present. For other properties, I need to check the contents of the file that you've generated. For instance, properties are required: [piece length, pieces] message looks like a valid reason to fail the parsing of metainfo, because without these properties we won't be able to download the data anyways. It's weird that qBittorrent accepts the file, but maybe I'm missing something.

Can you post the file?

[IriaSomobu]

Here you are:
file.torrent.zip

[atomashpolskiy]

Try adding a bogus announce value.

[atomashpolskiy]

Yep, adding announce does the trick:

d8:announce8:http://a4:info...

So, there are three issues:

• announce should be optional
• validation should be more specific about the problem (currently it just dumps all the rules, even if only a single rule has been violated it's more subtle actually)
• client should terminate properly on validation errors