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# OpenRS2
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[![Drone][drone-badge]][drone] [![Discord][discord-badge]][discord] [![ISC license][isc-badge]][isc]
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## Introduction
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OpenRS2 is an open-source multiplayer game server and suite of associated tools.
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It is compatible with build 550 of the RuneScape client, which was released in
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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 beneath
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the root of the repository), in the following structure:
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```
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nonfree
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└── lib
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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 CRC-32 checksums and SHA-256 digests of the correct files are:
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| CRC-32 checksum | SHA-256 digest | File |
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|----------------:|--------------------------------------------------------------------|------------------------|
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| `-1418094567` | `d39578f4a88a376bcb2571f05da1939a14a80d8c4ed89a4eb172d9e525795fe2` | `jaggl.pack200` |
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| `-2129469231` | `31182683ba04dc0ad45859161c13f66424b10deb0b2df10aa58b48bba57402db` | `loader_gl.jar` |
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| `-1516355035` | `ccdfaa86be07452ddd69f869ade86ea900dbb916fd853db16602edf2eb54211b` | `loader.jar` |
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| `-132784534` | `4a5032ea8079d2154617ae1f21dfcc46a10e023c8ba23a4827d5e25e75c73045` | `runescape_gl.pack200` |
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| `1692522675` | `0ab28a95e7c5993860ff439ebb331c0df02ad40aa1f544777ed91b46d30d3d24` | `runescape.jar` |
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| `-1911426584` | `7c090e07f8d754d09804ff6e9733ef3ba227893b6b639436db90977b39122590` | `unpackclass.pack` |
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The `.gitignore` file includes the `nonfree` directory to prevent any non-free
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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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IDEA 2020.3's built-in build system breaks with a cryptic
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`java: java.lang.IllegalArgumentException` error message when compiling modules
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that use the `deob-annotations` processor. A workaround is to add
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`-Djps.track.ap.dependencies=false` to the 'Shared build process VM options' in
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File -> Settings -> Build, Execution and Deployment -> Compiler. See
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[IDEA-256707][idea-bug] for more information.
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## Links
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* [Discord][discord]
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* [Issue tracker][issue-tracker]
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* [KDoc][kdoc]
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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 similar
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to the 2-clause BSD license. The full copyright notice and terms are available
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in the `LICENSE` file.
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[discord-badge]: https://img.shields.io/discord/684495254145335298
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[discord]: https://chat.openrs2.org/
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[drone-badge]: https://build.openrs2.org/api/badges/openrs2/openrs2/status.svg
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[drone]: https://build.openrs2.org/openrs2/openrs2/
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[idea-bug]: https://youtrack.jetbrains.com/issue/IDEA-256707
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[isc-badge]: https://img.shields.io/badge/license-ISC-informational
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Switch to the ISC license
I've been considering this for a long time, and have decided to switch to it at
the last minute before opening the repository up publicly. My reasons include:
* It's a much simpler license. GPL's complexity adds some risk - for example, it
might be incompatible with future open-source licenses (like the well-known
GPLv2/Apache v2 incompatibility problem). The "or any later version" clause
requires placing some trust in the Free Software Foundation.
* The simplicity makes it easier for people to understand and comply with the
license.
* Dishonest users who disobey the GPL would have an advantage over honest users
who refuse to do so. The ISC license provides a much more even playing field.
* OpenRS2 will primarily be server software accessible over a network. As such,
the GPL can do little to prevent use of the code in a proprietary system, as
the code is never distributed. (While the AGPL would fix this, I have already
discounted it. Enforcement would be too difficult and dishonest users would
have an unfair advantage.)
* It's much easier to switch to a stricter license in future versions, if it
turns out that is desirable (as the ISC license allows users to sublicense
the code). However, switching from the GPL to the ISC license requires all
copyright holders to grant permission.
* Other open-source projects in the community, such as Apollo, use the ISC
license and will be able to make use of OpenRS2 code if they so desire.
I've removed the FAQ entry about the reasons for using the GPL license, as I
think the ISC license is less controversial and therefore does not require an
entry.
I've discussed this with Desetude, and he's okay with his commit being
relicensed.
5 years ago
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[isc]: https://opensource.org/licenses/ISC
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[issue-tracker]: https://git.openrs2.org/openrs2/openrs2/issues
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[jdk]: https://jdk.java.net/
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[kdoc]: https://docs.openrs2.org/
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[www]: https://www.openrs2.org/
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