OpenSearch/docs/plugins/authors.asciidoc

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[[plugin-authors]]
== Help for plugin authors
Add the ability to bundle multiple plugins into a meta plugin (#28022) This commit adds the ability to package multiple plugins in a single zip. The zip file for a meta plugin must contains the following structure: |____elasticsearch/ | |____ <plugin1> <-- The plugin files for plugin1 (the content of the elastisearch directory) | |____ <plugin2> <-- The plugin files for plugin2 | |____ meta-plugin-descriptor.properties <-- example contents below The meta plugin properties descriptor is mandatory and must contain the following properties: description: simple summary of the meta plugin. name: the meta plugin name The installation process installs each plugin in a sub-folder inside the meta plugin directory. The example above would create the following structure in the plugins directory: |_____ plugins | |____ <name_of_the_meta_plugin> | | |____ meta-plugin-descriptor.properties | | |____ <plugin1> | | |____ <plugin2> If the sub plugins contain a config or a bin directory, they are copied in a sub folder inside the meta plugin config/bin directory. |_____ config | |____ <name_of_the_meta_plugin> | | |____ <plugin1> | | |____ <plugin2> |_____ bin | |____ <name_of_the_meta_plugin> | | |____ <plugin1> | | |____ <plugin2> The sub-plugins are loaded at startup like normal plugins with the same restrictions; they have a separate class loader and a sub-plugin cannot have the same name than another plugin (or a sub-plugin inside another meta plugin). It is also not possible to remove a sub-plugin inside a meta plugin, only full removal of the meta plugin is allowed. Closes #27316
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:plugin-properties-files: {docdir}/../../buildSrc/src/main/resources
The Elasticsearch repository contains examples of:
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* a https://github.com/elastic/elasticsearch/tree/master/plugins/examples/custom-settings[Java plugin]
which contains a plugin with custom settings.
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* a https://github.com/elastic/elasticsearch/tree/master/plugins/examples/rest-handler[Java plugin]
which contains a plugin that registers a Rest handler.
Add the ability to bundle multiple plugins into a meta plugin (#28022) This commit adds the ability to package multiple plugins in a single zip. The zip file for a meta plugin must contains the following structure: |____elasticsearch/ | |____ <plugin1> <-- The plugin files for plugin1 (the content of the elastisearch directory) | |____ <plugin2> <-- The plugin files for plugin2 | |____ meta-plugin-descriptor.properties <-- example contents below The meta plugin properties descriptor is mandatory and must contain the following properties: description: simple summary of the meta plugin. name: the meta plugin name The installation process installs each plugin in a sub-folder inside the meta plugin directory. The example above would create the following structure in the plugins directory: |_____ plugins | |____ <name_of_the_meta_plugin> | | |____ meta-plugin-descriptor.properties | | |____ <plugin1> | | |____ <plugin2> If the sub plugins contain a config or a bin directory, they are copied in a sub folder inside the meta plugin config/bin directory. |_____ config | |____ <name_of_the_meta_plugin> | | |____ <plugin1> | | |____ <plugin2> |_____ bin | |____ <name_of_the_meta_plugin> | | |____ <plugin1> | | |____ <plugin2> The sub-plugins are loaded at startup like normal plugins with the same restrictions; they have a separate class loader and a sub-plugin cannot have the same name than another plugin (or a sub-plugin inside another meta plugin). It is also not possible to remove a sub-plugin inside a meta plugin, only full removal of the meta plugin is allowed. Closes #27316
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* a https://github.com/elastic/elasticsearch/tree/master/plugins/examples/rescore[Java plugin]
which contains a rescore plugin.
* a https://github.com/elastic/elasticsearch/tree/master/plugins/examples/script-expert-scoring[Java plugin]
which contains a script plugin.
These examples provide the bare bones needed to get started. For more
information about how to write a plugin, we recommend looking at the plugins
listed in this documentation for inspiration.
[float]
=== Plugin descriptor file
All plugins must contain a file called `plugin-descriptor.properties`.
Add the ability to bundle multiple plugins into a meta plugin (#28022) This commit adds the ability to package multiple plugins in a single zip. The zip file for a meta plugin must contains the following structure: |____elasticsearch/ | |____ <plugin1> <-- The plugin files for plugin1 (the content of the elastisearch directory) | |____ <plugin2> <-- The plugin files for plugin2 | |____ meta-plugin-descriptor.properties <-- example contents below The meta plugin properties descriptor is mandatory and must contain the following properties: description: simple summary of the meta plugin. name: the meta plugin name The installation process installs each plugin in a sub-folder inside the meta plugin directory. The example above would create the following structure in the plugins directory: |_____ plugins | |____ <name_of_the_meta_plugin> | | |____ meta-plugin-descriptor.properties | | |____ <plugin1> | | |____ <plugin2> If the sub plugins contain a config or a bin directory, they are copied in a sub folder inside the meta plugin config/bin directory. |_____ config | |____ <name_of_the_meta_plugin> | | |____ <plugin1> | | |____ <plugin2> |_____ bin | |____ <name_of_the_meta_plugin> | | |____ <plugin1> | | |____ <plugin2> The sub-plugins are loaded at startup like normal plugins with the same restrictions; they have a separate class loader and a sub-plugin cannot have the same name than another plugin (or a sub-plugin inside another meta plugin). It is also not possible to remove a sub-plugin inside a meta plugin, only full removal of the meta plugin is allowed. Closes #27316
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The format for this file is described in detail in this example:
["source","properties"]
Add the ability to bundle multiple plugins into a meta plugin (#28022) This commit adds the ability to package multiple plugins in a single zip. The zip file for a meta plugin must contains the following structure: |____elasticsearch/ | |____ <plugin1> <-- The plugin files for plugin1 (the content of the elastisearch directory) | |____ <plugin2> <-- The plugin files for plugin2 | |____ meta-plugin-descriptor.properties <-- example contents below The meta plugin properties descriptor is mandatory and must contain the following properties: description: simple summary of the meta plugin. name: the meta plugin name The installation process installs each plugin in a sub-folder inside the meta plugin directory. The example above would create the following structure in the plugins directory: |_____ plugins | |____ <name_of_the_meta_plugin> | | |____ meta-plugin-descriptor.properties | | |____ <plugin1> | | |____ <plugin2> If the sub plugins contain a config or a bin directory, they are copied in a sub folder inside the meta plugin config/bin directory. |_____ config | |____ <name_of_the_meta_plugin> | | |____ <plugin1> | | |____ <plugin2> |_____ bin | |____ <name_of_the_meta_plugin> | | |____ <plugin1> | | |____ <plugin2> The sub-plugins are loaded at startup like normal plugins with the same restrictions; they have a separate class loader and a sub-plugin cannot have the same name than another plugin (or a sub-plugin inside another meta plugin). It is also not possible to remove a sub-plugin inside a meta plugin, only full removal of the meta plugin is allowed. Closes #27316
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--------------------------------------------------
include::{plugin-properties-files}/plugin-descriptor.properties[]
Add the ability to bundle multiple plugins into a meta plugin (#28022) This commit adds the ability to package multiple plugins in a single zip. The zip file for a meta plugin must contains the following structure: |____elasticsearch/ | |____ <plugin1> <-- The plugin files for plugin1 (the content of the elastisearch directory) | |____ <plugin2> <-- The plugin files for plugin2 | |____ meta-plugin-descriptor.properties <-- example contents below The meta plugin properties descriptor is mandatory and must contain the following properties: description: simple summary of the meta plugin. name: the meta plugin name The installation process installs each plugin in a sub-folder inside the meta plugin directory. The example above would create the following structure in the plugins directory: |_____ plugins | |____ <name_of_the_meta_plugin> | | |____ meta-plugin-descriptor.properties | | |____ <plugin1> | | |____ <plugin2> If the sub plugins contain a config or a bin directory, they are copied in a sub folder inside the meta plugin config/bin directory. |_____ config | |____ <name_of_the_meta_plugin> | | |____ <plugin1> | | |____ <plugin2> |_____ bin | |____ <name_of_the_meta_plugin> | | |____ <plugin1> | | |____ <plugin2> The sub-plugins are loaded at startup like normal plugins with the same restrictions; they have a separate class loader and a sub-plugin cannot have the same name than another plugin (or a sub-plugin inside another meta plugin). It is also not possible to remove a sub-plugin inside a meta plugin, only full removal of the meta plugin is allowed. Closes #27316
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--------------------------------------------------
Either fill in this template yourself or, if you are using Elasticsearch's Gradle build system, you
can fill in the necessary values in the `build.gradle` file for your plugin.
[float]
==== Mandatory elements for plugins
[cols="<,<,<",options="header",]
|=======================================================================
|Element | Type | Description
|`description` |String | simple summary of the plugin
|`version` |String | plugin's version
|`name` |String | the plugin name
|`classname` |String | the name of the class to load, fully-qualified.
|`java.version` |String | version of java the code is built against.
Use the system property `java.specification.version`. Version string must be a sequence
of nonnegative decimal integers separated by "."'s and may have leading zeros.
|`elasticsearch.version` |String | version of Elasticsearch compiled against.
|=======================================================================
Note that only jar files at the root of the plugin are added to the classpath for the plugin!
If you need other resources, package them into a resources jar.
[IMPORTANT]
.Plugin release lifecycle
==============================================
You will have to release a new version of the plugin for each new Elasticsearch release.
This version is checked when the plugin is loaded so Elasticsearch will refuse to start
in the presence of plugins with the incorrect `elasticsearch.version`.
==============================================
[float]
=== Testing your plugin
When testing a Java plugin, it will only be auto-loaded if it is in the
`plugins/` directory. Use `bin/elasticsearch-plugin install file:///path/to/your/plugin`
to install your plugin for testing.
You may also load your plugin within the test framework for integration tests.
Read more in {ref}/integration-tests.html#changing-node-configuration[Changing Node Configuration].
Decentralize plugin security * Add ability for plugins to declare additional permissions with a custom plugin-security.policy file and corresponding AccessController logic. See the plugin author's guide for more information. * Add warning messages to users for extra plugin permissions in bin/plugin. * When bin/plugin is run interactively (stdin is a controlling terminal and -b/--batch not supplied), require user confirmation. * Improve unit test and IDE support for plugins with additional permissions by exposing plugin's metadata as a maven test resource. Closes #14108 Squashed commit of the following: commit cf8ace65a7397aaccd356bf55f95d6fbb8bb571c Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 13:36:05 2015 -0400 fix new unit test from master merge commit 9be3c5aa38f2d9ae50f3d54924a30ad9cddeeb65 Merge: 2f168b8 7368231 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 12:58:31 2015 -0400 Merge branch 'master' into off_my_back commit 2f168b8038e32672f01ad0279fb5db77ba902ae8 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 12:56:04 2015 -0400 improve plugin author documentation commit 6e6c2bfda68a418d92733ac22a58eec35508b2d0 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 12:52:14 2015 -0400 move security confirmation after 'plugin already installed' check, to prevent user from answering unnecessary questions. commit 08233a2972554afef2a6a7521990283102e20d92 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 05:36:42 2015 -0400 Add documentation and pluginmanager support commit 05dad86c51488ba43ccbd749f0164f3fbd3aee62 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 02:22:24 2015 -0400 Decentralize plugin permissions (modulo docs and pluginmanager work)
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[float]
[[plugin-authors-jsm]]
Decentralize plugin security * Add ability for plugins to declare additional permissions with a custom plugin-security.policy file and corresponding AccessController logic. See the plugin author's guide for more information. * Add warning messages to users for extra plugin permissions in bin/plugin. * When bin/plugin is run interactively (stdin is a controlling terminal and -b/--batch not supplied), require user confirmation. * Improve unit test and IDE support for plugins with additional permissions by exposing plugin's metadata as a maven test resource. Closes #14108 Squashed commit of the following: commit cf8ace65a7397aaccd356bf55f95d6fbb8bb571c Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 13:36:05 2015 -0400 fix new unit test from master merge commit 9be3c5aa38f2d9ae50f3d54924a30ad9cddeeb65 Merge: 2f168b8 7368231 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 12:58:31 2015 -0400 Merge branch 'master' into off_my_back commit 2f168b8038e32672f01ad0279fb5db77ba902ae8 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 12:56:04 2015 -0400 improve plugin author documentation commit 6e6c2bfda68a418d92733ac22a58eec35508b2d0 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 12:52:14 2015 -0400 move security confirmation after 'plugin already installed' check, to prevent user from answering unnecessary questions. commit 08233a2972554afef2a6a7521990283102e20d92 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 05:36:42 2015 -0400 Add documentation and pluginmanager support commit 05dad86c51488ba43ccbd749f0164f3fbd3aee62 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 02:22:24 2015 -0400 Decentralize plugin permissions (modulo docs and pluginmanager work)
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=== Java Security permissions
Some plugins may need additional security permissions. A plugin can include
the optional `plugin-security.policy` file containing `grant` statements for
additional permissions. Any additional permissions will be displayed to the user
with a large warning, and they will have to confirm them when installing the
Decentralize plugin security * Add ability for plugins to declare additional permissions with a custom plugin-security.policy file and corresponding AccessController logic. See the plugin author's guide for more information. * Add warning messages to users for extra plugin permissions in bin/plugin. * When bin/plugin is run interactively (stdin is a controlling terminal and -b/--batch not supplied), require user confirmation. * Improve unit test and IDE support for plugins with additional permissions by exposing plugin's metadata as a maven test resource. Closes #14108 Squashed commit of the following: commit cf8ace65a7397aaccd356bf55f95d6fbb8bb571c Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 13:36:05 2015 -0400 fix new unit test from master merge commit 9be3c5aa38f2d9ae50f3d54924a30ad9cddeeb65 Merge: 2f168b8 7368231 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 12:58:31 2015 -0400 Merge branch 'master' into off_my_back commit 2f168b8038e32672f01ad0279fb5db77ba902ae8 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 12:56:04 2015 -0400 improve plugin author documentation commit 6e6c2bfda68a418d92733ac22a58eec35508b2d0 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 12:52:14 2015 -0400 move security confirmation after 'plugin already installed' check, to prevent user from answering unnecessary questions. commit 08233a2972554afef2a6a7521990283102e20d92 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 05:36:42 2015 -0400 Add documentation and pluginmanager support commit 05dad86c51488ba43ccbd749f0164f3fbd3aee62 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 02:22:24 2015 -0400 Decentralize plugin permissions (modulo docs and pluginmanager work)
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plugin interactively. So if possible, it is best to avoid requesting any
spurious permissions!
If you are using the Elasticsearch Gradle build system, place this file in
Decentralize plugin security * Add ability for plugins to declare additional permissions with a custom plugin-security.policy file and corresponding AccessController logic. See the plugin author's guide for more information. * Add warning messages to users for extra plugin permissions in bin/plugin. * When bin/plugin is run interactively (stdin is a controlling terminal and -b/--batch not supplied), require user confirmation. * Improve unit test and IDE support for plugins with additional permissions by exposing plugin's metadata as a maven test resource. Closes #14108 Squashed commit of the following: commit cf8ace65a7397aaccd356bf55f95d6fbb8bb571c Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 13:36:05 2015 -0400 fix new unit test from master merge commit 9be3c5aa38f2d9ae50f3d54924a30ad9cddeeb65 Merge: 2f168b8 7368231 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 12:58:31 2015 -0400 Merge branch 'master' into off_my_back commit 2f168b8038e32672f01ad0279fb5db77ba902ae8 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 12:56:04 2015 -0400 improve plugin author documentation commit 6e6c2bfda68a418d92733ac22a58eec35508b2d0 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 12:52:14 2015 -0400 move security confirmation after 'plugin already installed' check, to prevent user from answering unnecessary questions. commit 08233a2972554afef2a6a7521990283102e20d92 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 05:36:42 2015 -0400 Add documentation and pluginmanager support commit 05dad86c51488ba43ccbd749f0164f3fbd3aee62 Author: Robert Muir <rmuir@apache.org> Date: Wed Oct 14 02:22:24 2015 -0400 Decentralize plugin permissions (modulo docs and pluginmanager work)
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`src/main/plugin-metadata` and it will be applied during unit tests as well.
Keep in mind that the Java security model is stack-based, and the additional
permissions will only be granted to the jars in your plugin, so you will have
write proper security code around operations requiring elevated privileges.
It is recommended to add a check to prevent unprivileged code (such as scripts)
from gaining escalated permissions. For example:
[source,java]
--------------------------------------------------
// ES permission you should check before doPrivileged() blocks
import org.elasticsearch.SpecialPermission;
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
// unprivileged code such as scripts do not have SpecialPermission
sm.checkPermission(new SpecialPermission());
}
AccessController.doPrivileged(
// sensitive operation
);
--------------------------------------------------
See http://www.oracle.com/technetwork/java/seccodeguide-139067.html[Secure Coding Guidelines for Java SE]
for more information.