haveno/docs/tor-upgrade.md

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# Tor upgrade in Haveno
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This guide describes the steps necessary to upgrade the tor dependencies used by Haveno.
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## Background
Haveno uses two libraries for tor: [netlayer][1] and [tor-binary][2].
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As per the project's authors, `netlayer` is _"essentially a wrapper around the official Tor releases, pre-packaged for
easy use and convenient integration into Kotlin/Java projects"_.
Similarly, `tor-binary` is _"[the] Tor binary packaged in a way that can be used for java projects"_. The project
unpacks the tor browser binaries to extract and repackage the tor binaries themselves.
Therefore, upgrading tor in Haveno comes down to upgrading these two artefacts.
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## Upgrade steps
### 1. Decide if upgrade necessary
- Find out which tor version Haveno currently uses
- Find out the current `netlayer` version (see `netlayerVersion` in `haveno/build.gradle`)
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- Find that release on the project's [releases page][3]
- The release description says which tor version it includes
- Find out the latest available tor release
- See the [official tor changelog][4]
### 2. Update `tor-binary`
During this update, you will need to keep track of:
- the new tor browser version
- the new tor binary version
Create a PR for the `master` branch of [tor-binary][2] with the following changes:
- Decide which tor browser version contains the desired tor binary version
- The official tor browser releases are here: https://dist.torproject.org/torbrowser/
- For the chosen tor browser version, get the list of SHA256 checksums and its signature
- For example, for tor browser 10.0.12:
- https://dist.torproject.org/torbrowser/10.0.12/sha256sums-signed-build.txt
- https://dist.torproject.org/torbrowser/10.0.12/sha256sums-signed-build.txt.asc
- Verify the signature of the checksums list (see [instructions][5])
- Update the `tor-binary` checksums
- For each file present in `tor-binary/tor-binary-resources/checksums`:
- Rename the file such that it reflects the new tor browser version, but preserves the naming scheme
- Update the contents of the file with the corresponding SHA256 checksum from the list
- Update `torbrowser.version` to the new tor browser version in:
- `tor-binary/build.xml`
- `tor-binary/pom.xml`
- Update `version` to the new tor binary version in:
- `tor-binary/pom.xml`
- `tor-binary-geoip/pom.xml`
- `tor-binary-linux32/pom.xml`
- `tor-binary-linux64/pom.xml`
- `tor-binary-macos/pom.xml`
- `tor-binary-windows/pom.xml`
- `tor-binary-resources/pom.xml`
- Run `mvn install`
- If it completes successfully, then the artefact is correctly configured
Only the files listed above should be part of the PR. The last step will generate a few extra artefacts (for
example in `tor-binary-resources/src/main/resources`), but these should NOT be committed.
Once the PR is merged, make a note of the commit ID in the `master` branch (for example `a4b868a`), as it will be needed
next.
### 3. Update `netlayer`
Create a PR for the `externaltor` branch of [netlayer][1] with the following changes:
- In `netlayer/pom.xml`:
- Update `tor-binary.version` to the `tor-binary` commit ID from above (e.g. `a4b868a`)
- Bump `version`, representing the `netlayer` artefact version, in:
- `netlayer/pom.xml`
- `netlayer/tor/pom.xml`
- `netlayer/tor.external/pom.xml`
- `netlayer/tor.native/pom.xml`
Once the PR is merged, make a note of the commit ID in the `externaltor` branch (for example `32779ac`), as it will be
needed next.
Create a tag for the new artefact version, having the new tor binary version as description, for example:
```
# Create tag locally for new netlayer release, on the externaltor branch
git tag -s 0.7.0 -m"tor 0.4.5.6"
# Push it to netlayer repo
git push origin 0.7.0
```
### 4. Update dependency in Haveno
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Create a Haveno PR with the following changes:
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- In `haveno/build.gradle` update `netlayerVersion` to the `netlayer` commit ID from above
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- Update the gradle dependency checksums
- See instructions in `haveno/gradle/witness/gradle-witness.gradle`
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## Credits
Thanks to freimair, JesusMcCloud, mrosseel, sschuberth and cedricwalter for their work on the original
[tor-binary](https://github.com/JesusMcCloud/tor-binary) and [netlayer](https://github.com/JesusMcCloud/netlayer) repos.
[1]: https://github.com/bisq-network/netlayer "netlayer"
[2]: https://github.com/bisq-network/tor-binary "tor-binary"
[3]: https://github.com/bisq-network/netlayer/releases "netlayer releases"
[4]: https://gitweb.torproject.org/tor.git/plain/ChangeLog "tor changelog"
[5]: https://support.torproject.org/tbb/how-to-verify-signature/ "verify tor signature"