How Can I Access Request Context in Go Templates?

Passing Request Context in Go Templates

In Go HTML templates, accessing information from the request that triggered its execution is not straightforward. This can be problematic when you need to apply conditional logic based on user attributes, such as determining if a user is an administrator.

To address this challenge, the preferred approach is to utilize the data pipeline mechanism. By embedding the request context into your template data structure, you can access request-specific information within the template.

For example, let's say you want to display a link to a restricted "nuclear button" only if the user is an administrator. In this case, you could structure your template data as follows:

<code class="go">type TemplateData struct {
    Content       *Content
    Context       *Context
    IsUserAdmin   bool
}</code>

Within your template, you can then use the IsUserAdmin variable to conditionally display the link:

<code class="html">{{if IsUserAdmin}}
    <a href="/admin/nuke">Go to the big red nuclear button</a>
{{end}}</code>

This approach effectively passes request-specific information into the template without mixing logic into the view. It allows you to maintain the separation between the controller, which handles the application logic, and the template, which handles the rendering.

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