2022-12-23 10:58:54 +00:00
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---
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title: "Templating"
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description: "A reference guide on the templates system"
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lead: "This section contains reference documentation for Authelia's templating capabilities."
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date: 2022-12-23T18:31:05+11:00
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draft: false
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images: []
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menu:
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reference:
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parent: "guides"
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weight: 220
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toc: true
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---
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Authelia has several methods where users can interact with templates.
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## Functions
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Functions can be used to perform specific actions when executing templates. The following is a simple guide on which
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functions exist.
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### Standard Functions
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Go has a set of standard functions which can be used. See the [Go Documentation](https://pkg.go.dev/text/template#hdr-Functions)
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for more information.
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### Helm-like Functions
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The following functions which mimic the behaviour of helm exist in most templating areas:
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- env
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- expandenv
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- split
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- splitList
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- join
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- contains
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- hasPrefix
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- hasSuffix
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- lower
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- upper
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- title
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- trim
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- trimAll
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- trimSuffix
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- trimPrefix
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- replace
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- quote
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- sha1sum
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- sha256sum
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- sha512sum
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- squote
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- now
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- keys
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- sortAlpha
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- b64enc
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- b64dec
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- b32enc
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- b32dec
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See the [Helm Documentation](https://helm.sh/docs/chart_template_guide/function_list/) for more information. Please
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note that only the functions listed above are supported and the functions don't necessarily behave exactly the same.
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__*Special Note:* The `env` and `expandenv` function automatically excludes environment variables that start with
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`AUTHELIA_` or `X_AUTHELIA_` and end with one of `KEY`, `SECRET`, `PASSWORD`, `TOKEN`, or `CERTIFICATE_CHAIN`.__
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### Special Functions
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The following is a list of special functions and their syntax.
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#### iterate
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Input is a single uint. Returns a slice of uints from 0 to the provided uint.
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