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# OpenRS2
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[](https://build.openrs2.dev/openrs2/openrs2/)
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## Introduction
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OpenRS2 is an open-source multiplayer game server and suite of associated
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tools. It is compatible with build 550 of the RuneScape client, which was
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released in late 2009.
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## Prerequisites
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OpenRS2 requires version 11 or later of the [Java Development Kit][jdk].
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The JDK is required even if a pre-built copy of OpenRS2 is used, as it depends
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on JDK-only tools, such as `jarsigner`, at runtime.
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### Non-free components
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OpenRS2 requires the original RuneScape client code, data and location file
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encryption keys, which we cannot legally distribute.
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These files must be manually placed in the `nonfree` directory (directly
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beneath the root of the repository), in the following structure:
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```
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nonfree
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└── code
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├── jaggl.pack200
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├── loader_gl.jar
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├── loader.jar
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├── runescape_gl.pack200
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├── runescape.jar
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└── unpackclass.pack
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```
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The SHA-256 checksums of the correct files are:
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```
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d39578f4a88a376bcb2571f05da1939a14a80d8c4ed89a4eb172d9e525795fe2 nonfree/code/jaggl.pack200
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31182683ba04dc0ad45859161c13f66424b10deb0b2df10aa58b48bba57402db nonfree/code/loader_gl.jar
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ccdfaa86be07452ddd69f869ade86ea900dbb916fd853db16602edf2eb54211b nonfree/code/loader.jar
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4a5032ea8079d2154617ae1f21dfcc46a10e023c8ba23a4827d5e25e75c73045 nonfree/code/runescape_gl.pack200
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0ab28a95e7c5993860ff439ebb331c0df02ad40aa1f544777ed91b46d30d3d24 nonfree/code/runescape.jar
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7c090e07f8d754d09804ff6e9733ef3ba227893b6b639436db90977b39122590 nonfree/code/unpackclass.pack
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```
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The `nonfree` directory is included in the `.gitignore` file to prevent any
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non-free material from being accidentally included in the repository.
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## Building
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Run `./gradlew` to download the dependencies, build the code, run the unit tests
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and package it.
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## Contributing
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OpenRS2 is still in the early stages of development. The current focus is on
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building underlying infrastructure, such as the deobfuscator, rather than
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game content. This approach will make it much quicker to build game content in
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the long run, but it does mean OpenRS2 won't be particularly useful in the short
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term.
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If you're interested in contributing new features, you should discuss your
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plans in our [Discord][discord] server first. I have rough plans in my head for
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the future development direction. Communicating beforehand will avoid the need
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for significant changes to be made at the code review stage and make it less
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likely for your contribution to be dropped entirely.
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### Code style
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All source code must be formatted with [IntelliJ IDEA][idea]'s built-in
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formatter before each commit. The 'Optimize imports' option should also be
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selected. Do not select 'Rearrange entries'.
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OpenRS2's code style settings are held in `.idea/codeStyles/Project.xml` in the
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repository, and IDEA should use them automatically after importing the Gradle
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project.
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Kotlin code must pass all of [ktlint][ktlint]'s tests.
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Always use `//` for single-line comments and `/*` for multi-line comments.
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### Commit messages
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Commit messages should follow the ['seven rules'][commitmsg] described in
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'How to Write a Git Commit Message', with the exception that the summary line
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can be up to 72 characters in length (as OpenRS2 does not use email-based
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patches).
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You should use tools like [interactive rebase][rewriting-history] to ensure the
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commit history is tidy.
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### Developer Certificate of Origin
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OpenRS2 uses version 1.1 of the [Developer Certificate of Origin][dco] (DCO) to
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certify that contributors agree to license their code under OpenRS2's license
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(see the License section below). To confirm that a contribution meets the
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requirements of the DCO, a `Signed-off-by:` line must be added to the Git
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commit message by passing `--signoff` to the `git commit` invocation.
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If you intend to make a large number of contributions, run the following
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commands from the repository root to add `Signed-off-by:` line to all your
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commit messages by default:
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```
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echo -e "\n\nSigned-off-by: $(git config user.name) <$(git config user.email)>" > .git/commit-template
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git config commit.template .git/commit-template
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```
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The full text of the DCO is available in the `DCO` file.
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OpenRS2 does not distribute any of Jagex's intellectual property, and care
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should be taken to avoid inadvertently including any in contributions.
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### Versioning
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OpenRS2 uses [Semantic Versioning][semver].
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## Community
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* [Discord][discord]
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* [Website][www]
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## License
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OpenRS2 is available under the terms of the [ISC license][isc], which is
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similar to the 2-clause BSD license. The full copyright notice and terms are
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available in the `LICENSE` file.
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[commitmsg]: https://chris.beams.io/posts/git-commit/#seven-rules
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[dco]: https://developercertificate.org/
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[discord]: https://chat.openrs2.dev/
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[idea]: https://www.jetbrains.com/idea/
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[isc]: https://opensource.org/licenses/ISC
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[jdk]: https://jdk.java.net/
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[ktlint]: https://github.com/pinterest/ktlint#readme
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[rewriting-history]: https://git-scm.com/book/en/v2/Git-Tools-Rewriting-History
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[semver]: https://semver.org/
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[www]: https://www.openrs2.dev/
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