safe.URL

Introduction

Hugo uses Go’s text/template and html/template packages.

The text/template package implements data-driven templates for generating textual output, while the html/template package implements data-driven templates for generating HTML output safe against code injection.

By default, Hugo uses the html/template package when rendering HTML files.

To generate HTML output that is safe against code injection, the html/template package escapes strings in certain contexts.

Usage

Use the safe.URL function to encapsulate a known safe URL or URL substring. Schemes other than the following are considered unsafe:

• http:
• https:
• mailto:

Use of this type presents a security risk: the encapsulated content should come from a trusted source, as it will be included verbatim in the template output.

See the Go documentation for details.

Example

Without a safe declaration:

{{ $href := "irc://irc.freenode.net/#golang" }}
<a href="{{ $href }}">IRC</a>

Hugo renders the above to:

<a href="#ZgotmplZ">IRC</a>

To declare the string as safe:

{{ $href := "irc://irc.freenode.net/#golang" }}
<a href="{{ $href | safeURL }}">IRC</a>

Hugo renders the above to:

<a href="irc://irc.freenode.net/#golang">IRC</a>