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Package craft-asset-rev
Short Description A plugin to aid cache-busting
License MIT
Informations about the package craft-asset-rev
CraftCMS Asset Rev / Cache Busting
Looking for Craft 2 Support? Asset Rev for Craft 2
A Twig extension for CraftCMS that helps you cache-bust your assets using configurable strategies.
Why?
In order to speed up the load time of your pages, you can set a far-future expires header on your images, stylesheets and scripts. However, when you update those assets you'll need to update their file names to force the browser to download the updated version.
Using a manifest file is the recommended approach - you can read up on why using query strings isn't ideal here.
Strategies
This plugin allows you to configure multiple cache-busting strategies for your asset filenames. The plugin comes with three strategies out of the box:
Manifest File
css/main.css
will be replaced with the corresponding hashed filename as defined within your assets manifest .json
file.
If the contents of your manifest file are...
then rev('css/main.css')
will expand to css/main.a9961d38.css
.
Please note: This plugin does not create manifest files; instead they should be generated during your build process using Gulp Rev, Laravel Mix or another comparable tool.
Query String
Append a query string to your file, based on the time it was last modified. For example: rev('css/main.css')
will expand to something like css/main.css?1473534554
.
Passthrough
Returns the original filename, without modification. This is useful if all other cache-busting strategies fail.
Strategy Pipeline
Pipelines allow you to attempt multiple cache-busting strategies in sequence. If one strategy fails, the plugin can proceed to try and cache-bust the asset filename using the next strategy in the pipeline.
The default pipeline is manifest|querystring|passthrough
and will:
- Attempt to use the
ManifestFileStrategy
. If it can’t, because the manifest file doesn’t exist, it will throw aContinueException
that defers cache-busting to the next strategy in the pipeline… - Attempt to use the
QueryStringStrategy
. If it can’t, because it can’t find the asset file, it will throw anotherContinueException
that defers cache-busting to the final default strategy… - Returns the original filename using the closure-based pass-through strategy.
Need to provide your own cache-busting logic? Simply create your own implementation of the Strategy class or define a Closure in the configuration file.
Installation
Install via the Plugin Store within your Craft 3 installation or using Composer: composer require clubstudioltd/craft-asset-rev
Configuration
The plugin comes with a config.php
file that defines some sensible defaults.
If you want to set your own values you should create a assetrev.php
file in your Craft config directory. The contents of this file will get merged with the plugin defaults, so you only need to specify values for the settings you want to override.
Strategies
strategies
is where you define the strategies you'd like to try to rev your asset filename. You can provide the name of a class that implements StrategyContact
or a custom closure. The defaults should cater to most requirements.
Pipeline
pipeline
allows you to set the order of the configured strategies you'd like to try when revving your asset file names. The default of: manifest|querystring|passthrough
should be adequate for most use-cases.
Manifest Path
manifestPath
is where Craft should look for your manifest file. Non-absolute paths will be relative to the base path of your Craft installation (whatever CRAFT_BASE_PATH
is set to).
Assets Base Path
assetsBasePath
is the the base path to your assets. Again, this is relative to your craft base directory, unless you supply an absolute directory path.
Asset Url Prefix
assetUrlPrefix
will be prepended to the output of rev()
.
Note: You can use Yii aliases in your configuration values.
An Example Config File
Usage
Once activated and configured you can use the rev()
function in your templates.
Custom Strategies
Need to provide your own cache-busting logic? Create your own Strategy class or simply use a Closure.
Example Strategy Class
Example Closure
Your method will have access to the asset filename and the plugin configuration array.