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487 lines
12 KiB
Markdown
487 lines
12 KiB
Markdown
---
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title: Built-in privacy plugin
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icon: material/shield-account
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---
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# Built-in privacy plugin
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The privacy plugin offers a streamlined solution for automatically self-hosting
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external assets. With just a single line of configuration, the plugin can
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automatically identify and download external assets, making GDPR compliance
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as effortless as it can possibly be.
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## Objective
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### How it works
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The plugin scans the generated HTML for external assets, i.e., scripts, style
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sheets, images, and web fonts, downloads them, stores them in the
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[`site` directory][mkdocs.site_dir] and replaces all references with links to
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the downloaded copies for effortless self-hosting. For example:
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``` html
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<script src="https://example.com/script.js"></script>
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```
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This external script is downloaded, and the link is replaced with:
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``` html
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<script src="assets/external/example.com/script.js"></script>
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```
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Of course, scripts and style sheets can reference further external assets,
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which is why this process is repeated recursively until no further external
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assets are detected:
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- Scripts are scanned for further scripts, style sheets and JSON files
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- Style sheets are scanned for images and web fonts
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Additionally, hints like [`preconnect`][preconnect], used to reduce latency when
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requesting external assets, are removed from the output, as they're not
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necessary when self-hosting. After the plugin has done it's work, your project
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will be free of requests to external services.
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There are some [limitations].
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[preconnect]: https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel/preconnect
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[limitations]: #limitations
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### When to use it
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The plugin was developed to make compliance with the 2018 European
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__General Data Protection Regulation__ (GDPR) as simple as possible, while
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retaining the flexibility and power that Material for MkDocs offers, like for
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example its tight integration with [Google Fonts].
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But, that's only the start. For example, if your project includes a lot of
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images, enabling the plugin allows to move them outside of your repository, as
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the plugin will automatically download and store them in the [`site` directory]
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[mkdocs.site_dir] when [building your project].
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Even more interestingly, the plugin can be combined with other built-in plugins
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that Material for MkDocs offers, in order to create sophisticated build
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pipelines tailored to your project:
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<div class="grid cards" markdown>
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- :material-rabbit: __[Built-in optimize plugin][optimize]__
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---
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The optimize plugin allows to optimize all downloaded external assets
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detected by the privacy plugin by using compression and conversion
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techniques.
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---
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__External media files are automatically downloaded and optimized__
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- :material-connection: __[Built-in offline plugin][offline]__
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---
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The offline plugin adds support for building [offline-capable documentation],
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so you can distribute the [`site` directory][mkdocs.site_dir] as a `.zip`
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file that can be downloaded.
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---
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__Your documentation can work without connectivity to the internet__
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</div>
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[Google Fonts]: ../setup/changing-the-fonts.md
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[building your project]: ../creating-your-site.md#building-your-site
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[optimize]: optimize.md
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[offline]: offline.md
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[offline-capable documentation]: ../setup/building-for-offline-usage.md
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## Configuration
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<!-- md:version 9.5.0 -->
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<!-- md:plugin [privacy] – built-in -->
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<!-- md:flag multiple -->
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<!-- md:flag experimental -->
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As with all [built-in plugins], getting started with the privacy plugin is
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straightforward. Just add the following lines to `mkdocs.yml`, and start
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effortlessly self-hosting external assets:
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``` yaml
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plugins:
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- privacy
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```
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The privacy plugin is built into Material for MkDocs and doesn't need to be
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installed.
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[privacy]: privacy.md
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[built-in plugins]: index.md
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### General
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The following settings are available:
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---
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#### <!-- md:setting config.enabled -->
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<!-- md:version 9.5.0 -->
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<!-- md:default `true` -->
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Use this setting to enable or disable the plugin when [building your project].
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If you want to disable the plugin, e.g., for local builds, you can use an
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[environment variable][mkdocs.env] in `mkdocs.yml`:
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``` yaml
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plugins:
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- privacy:
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enabled: !ENV [CI, false]
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```
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This configuration enables the plugin only during continuous integration (CI).
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---
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#### <!-- md:setting config.concurrency -->
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<!-- md:version 9.5.0 -->
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<!-- md:default available CPUs - 1 -->
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With more CPUs available, the plugin can do more work in parallel, and thus
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complete handling of external assets faster. If you want to disable concurrent
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processing completely, use:
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``` yaml
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plugins:
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- privacy:
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concurrency: 1
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```
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By default, the plugin uses all available CPUs - 1 with a minimum of 1.
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### Caching
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The plugin implements an [intelligent caching] mechanism, ensuring that external
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assets are only downloaded when they're not already contained in the cache.
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While the initial build might take some time, it's a good idea to use caching,
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as it will speed up consecutive builds.
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The following settings are available for caching:
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[intelligent caching]: requirements/caching.md
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---
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#### <!-- md:setting config.cache -->
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<!-- md:version 9.5.0 -->
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<!-- md:default `true` -->
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Use this setting to instruct the plugin to bypass the cache, in order to
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re-schedule downloads for all external assets, even though the cache may not be
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stale. It's normally not necessary to specify this setting, except for when
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debugging the plugin itself. Caching can be disabled with:
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``` yaml
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plugins:
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- privacy:
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cache: false
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```
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---
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#### <!-- md:setting config.cache_dir -->
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<!-- md:version 9.5.0 -->
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<!-- md:default `.cache/plugin/privacy` -->
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It is normally not necessary to specify this setting, except for when you want
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to change the path within your root directory where downloaded copies are
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cached. If you want to change it, use:
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``` yaml
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plugins:
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- privacy:
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cache_dir: my/custom/dir
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```
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If you're using [multiple instances] of the plugin, it can be a good idea to
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set different cache directories for both instances, so that they don't interfere
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with each other.
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[multiple instances]: index.md#multiple-instances
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### Logging
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The following settings are available for logging:
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---
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#### <!-- md:setting config.log -->
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<!-- md:sponsors -->
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<!-- md:version insiders-4.50.0 -->
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<!-- md:default `true` -->
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Use this setting to control whether the plugin should display log messages when
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building your site. While not being recommended, you can disable logging with:
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``` yaml
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plugins:
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- privacy:
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log: false
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```
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---
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#### <!-- md:setting config.log_level -->
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<!-- md:sponsors -->
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<!-- md:version insiders-4.50.0 -->
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<!-- md:default `info` -->
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Use this setting to control the log level that the plugin should employ when
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encountering errors, which requires that the [`log`][config.log] setting is
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enabled. The following log levels are available:
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=== "`error`"
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``` yaml
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plugins:
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- privacy:
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log_level: error
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```
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Only errors are reported.
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=== "`warn`"
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``` yaml
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plugins:
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- privacy:
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log_level: warn
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```
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Errors and warnings are reported, terminating the build in
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[`strict`][mkdocs.strict] mode. This includes warnings when symlinks cannot
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be created due to a lack of permissions on Windows systems (#6550).
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=== "`info`"
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``` yaml
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plugins:
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- privacy:
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log_level: info
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```
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Errors, warnings and informational messages are reported, including which
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assets were successfully downloaded by the plugin.
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=== "`debug`"
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``` yaml
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plugins:
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- privacy:
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log_level: debug
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```
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All messages are reported, including debug messages, if and only if MkDocs
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was started with the `--verbose` flag. Note that this will print a lot of
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messages and is only useful for debugging.
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### External assets
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The following settings are available for external assets:
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---
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#### <!-- md:setting config.assets -->
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<!-- md:version 9.5.0 -->
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<!-- md:default `true` -->
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Use this setting to control whether the plugin should download external
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assets. If you only want the plugin to process [external links], you can disable
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handling of external assets with:
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``` yaml
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plugins:
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- privacy:
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assets: false
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```
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[external links]: #external-links
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---
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#### <!-- md:setting config.assets_fetch -->
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<!-- md:version 9.5.0 -->
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<!-- md:default `true` -->
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Use this setting to control whether the plugin should downloads or only report
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external assets when they're encountered. If you already self-host all external
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assets, this setting can be used as a safety net to detect links to external
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assets placed by the author in pages:
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``` yaml
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plugins:
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- privacy:
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assets_fetch: true
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```
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---
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#### <!-- md:setting config.assets_fetch_dir -->
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<!-- md:version 9.5.0 -->
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<!-- md:default `assets/external` -->
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It is normally not necessary to specify this setting, except for when you want
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to change the path within the [`site` directory][mkdocs.site_dir] where
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external assets are stored. If you want to change it, use:
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``` yaml
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plugins:
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- privacy:
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assets_fetch_dir: my/custom/dir
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```
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This configuration stores the downloaded copies at `my/custom/dir` in the
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[`site` directory][mkdocs.site_dir].
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---
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#### <!-- md:setting config.assets_include -->
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<!-- md:sponsors -->
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<!-- md:version insiders-4.37.0 -->
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<!-- md:default none -->
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Use this setting to enable downloading of external assets for specific origins,
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e.g., when using [multiple instances] of the plugin to fine-tune processing of
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external assets for different origins:
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``` yaml
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plugins:
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- privacy:
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assets_include:
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- unsplash.com/*
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```
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---
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#### <!-- md:setting config.assets_exclude -->
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<!-- md:sponsors -->
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<!-- md:version insiders-4.37.0 -->
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<!-- md:default none -->
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Use this setting to disable downloading of external assets for specific origins,
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e.g., when using [multiple instances] of the plugin to fine-tune processing of
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external assets for different origins:
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``` yaml
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plugins:
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- privacy:
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assets_exclude: # (1)!
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- cdn.jsdelivr.net/npm/mathjax@3/*
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- giscus.app/*
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```
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1. [MathJax] loads web fonts for typesetting of mathematical content
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through relative URLs, and thus cannot be automatically bundled by the
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privacy plugin. [MathJax can be self-hosted].
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[Giscus], which we recommend to use as a [comment system], uses a technique
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called code-splitting to load only the code that is necessary, which
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is implemented via relative URLs. [Giscus can be self-hosted] as well.
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[MathJax]: ../reference/math.md
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[MathJax can be self-hosted]: https://docs.mathjax.org/en/latest/web/hosting.html
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[Giscus]: https://giscus.app/
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[comment system]: ../setup/adding-a-comment-system.md
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[Giscus can be self-hosted]: https://github.com/giscus/giscus/blob/main/SELF-HOSTING.md
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---
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### External links
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The following settings are available for external links:
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---
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#### <!-- md:setting config.links -->
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<!-- md:sponsors -->
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<!-- md:version insiders-4.37.0 -->
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<!-- md:default `true` -->
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Use this setting to instruct the plugin to parse and process external links to
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annotate them for [improved security], or to automatically add additional
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attributes to external links. If you want to disable processing of external
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links, use:
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``` yaml
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plugins:
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- privacy:
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links: false
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```
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[improved security]: https://developer.chrome.com/en/docs/lighthouse/best-practices/external-anchors-use-rel-noopener/
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---
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#### <!-- md:setting config.links_attr_map -->
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<!-- md:sponsors -->
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<!-- md:version insiders-4.37.0 -->
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<!-- md:default none -->
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Use this setting to specify additional attributes that should be added to
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external links, for example, to add `target="_blank"` to all external links
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so they open in a new tab:
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``` yaml
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plugins:
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- privacy:
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links_attr_map:
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target: _blank
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```
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---
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#### <!-- md:setting config.links_noopener -->
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<!-- md:sponsors -->
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<!-- md:version insiders-4.37.0 -->
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<!-- md:default `true` -->
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It is normally not recommended to change this setting, as it will automatically
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annotate external links that open in a new window with `rel="noopener"` for
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[improved security]:
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``` yaml
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plugins:
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- privacy:
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links_noopener: true
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```
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## Limitations
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Dynamically created URLs as part of scripts are not detected, and thus cannot be
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downloaded automatically, as the plugin does not execute scripts – it only detects fully qualified URLs for downloading and replacement. In short, don't do this:
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``` js
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const cdn = "https://polyfill.io"
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const url = `${cdn}/v3/polyfill.min.js`
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```
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Instead, always use fully qualified URLs:
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``` js
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const url ="https://polyfill.io/v3/polyfill.min.js"
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```
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