templates

package
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Published: Mar 15, 2021 License: Apache-2.0 Imports: 25 Imported by: 0

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type Templates

type Templates struct {
	// The root path from which to load files. Required if template functions
	// accessing the file system are used (such as include). Default is
	// `{http.vars.root}` if set, or current working directory otherwise.
	FileRoot string `json:"file_root,omitempty"`

	// The MIME types for which to render templates. It is important to use
	// this if the route matchers do not exclude images or other binary files.
	// Default is text/plain, text/markdown, and text/html.
	MIMETypes []string `json:"mime_types,omitempty"`

	// The template action delimiters.
	Delimiters []string `json:"delimiters,omitempty"`
}

Templates is a middleware which executes response bodies as Go templates. The syntax is documented in the Go standard library's [text/template package](https://golang.org/pkg/text/template/).

⚠️ Template functions/actions are still experimental, so they are subject to change.

[All Sprig functions](https://masterminds.github.io/sprig/) are supported.

In addition to the standard functions and Sprig functions, Caddy adds extra functions and data that are available to a template:

##### `.Args`

Access arguments passed to this page/context, for example as the result of a `include`.

``` {{.Args 0}} // first argument ```

##### `.Cookie`

Gets the value of a cookie by name.

``` {{.Cookie "cookiename"}} ```

##### `env`

Gets an environment variable.

``` {{env "VAR_NAME"}} ```

##### `placeholder`

Gets an [placeholder variable](/docs/conventions#placeholders). The braces (`{}`) have to be omitted.

``` {{placeholder "http.request.uri.path"}} {{placeholder "http.error.status_code"}} ```

##### `.Host`

Returns the hostname portion (no port) of the Host header of the HTTP request.

``` {{.Host}} ```

##### `httpInclude`

Includes the contents of another file by making a virtual HTTP request (also known as a sub-request). The URI path must exist on the same virtual server because the request does not use sockets; instead, the request is crafted in memory and the handler is invoked directly for increased efficiency.

``` {{httpInclude "/foo/bar?q=val"}} ```

##### `include`

Includes the contents of another file. Optionally can pass key-value pairs as arguments to be accessed by the included file.

``` {{include "path/to/file.html"}} // no arguments {{include "path/to/file.html" "arg1" 2 "value 3"}} // with arguments ```

##### `listFiles`

Returns a list of the files in the given directory, which is relative to the template context's file root.

``` {{listFiles "/mydir"}} ```

##### `markdown`

Renders the given Markdown text as HTML.

``` {{markdown "My _markdown_ text"}} ```

##### `.RemoteIP`

Returns the client's IP address.

``` {{.RemoteIP}} ```

##### `.Req`

Accesses the current HTTP request, which has various fields, including:

  • `.Method` - the method
  • `.URL` - the URL, which in turn has component fields (Scheme, Host, Path, etc.)
  • `.Header` - the header fields
  • `.Host` - the Host or :authority header of the request

``` {{.Req.Header.Get "User-Agent"}} ```

##### `.RespHeader.Add`

Adds a header field to the HTTP response.

``` {{.RespHeader.Add "Field-Name" "val"}} ```

##### `.RespHeader.Del`

Deletes a header field on the HTTP response.

``` {{.RespHeader.Del "Field-Name"}} ```

##### `.RespHeader.Set`

Sets a header field on the HTTP response, replacing any existing value.

``` {{.RespHeader.Set "Field-Name" "val"}} ```

##### `splitFrontMatter`

Splits front matter out from the body. Front matter is metadata that appears at the very beginning of a file or string. Front matter can be in YAML, TOML, or JSON formats:

**TOML** front matter starts and ends with `+++`:

``` +++ template = "blog" title = "Blog Homepage" sitename = "A Caddy site" +++ ```

**YAML** is surrounded by `---`:

``` --- template: blog title: Blog Homepage sitename: A Caddy site --- ```

**JSON** is simply `{` and `}`:

```

{
	"template": "blog",
	"title": "Blog Homepage",
	"sitename": "A Caddy site"
}

```

The resulting front matter will be made available like so:

- `.Meta` to access the metadata fields, for example: `{{$parsed.Meta.title}}` - `.Body` to access the body after the front matter, for example: `{{markdown $parsed.Body}}`

##### `stripHTML`

Removes HTML from a string.

``` {{stripHTML "Shows <b>only</b> text content"}} ```

func (Templates) CaddyModule

func (Templates) CaddyModule() caddy.ModuleInfo

CaddyModule returns the Caddy module information.

func (*Templates) Provision

func (t *Templates) Provision(ctx caddy.Context) error

Provision provisions t.

func (*Templates) ServeHTTP

func (t *Templates) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error

func (*Templates) Validate

func (t *Templates) Validate() error

Validate ensures t has a valid configuration.

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