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Add RenderPage Callback function #6

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Add RenderPage Callback function #6

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18 changes: 18 additions & 0 deletions html.go
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Original file line number Diff line number Diff line change
Expand Up @@ -15,12 +15,22 @@ import (
"github.com/rivo/sessions"
)

//Template data provider callback function signature
type tmplDataProvider func(*http.Request) map[string]interface{}

var (
// The list of htmlTemplates that have already been parsed.
htmlTemplates map[string]*template.Template
htmlTemplatesMutex sync.Mutex
renderPageDataCb tmplDataProvider
)

//SetRenderPageDataCb sets the callback handler that is invoked when RenderPage is executed
//The provided map is accessible within a template though a key called "extdata".
func SetRenderPageDataCb(f tmplDataProvider) {
renderPageDataCb = f
}

// retrieveTemplate returns an HTML template with the given filename (located in
// Config.HTMLTemplateDir or a subdirectory of it, depending on the value of
// Config.Internationalization), retrieving it from the cache if
Expand Down Expand Up @@ -123,6 +133,14 @@ func RenderPage(response http.ResponseWriter, request *http.Request, htmlTemplat
response.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
response.Header().Set("Pragma", "no-cache")
response.Header().Set("Expires", "0")

dataMap, ok := data.(map[string]interface{})
// Inject extended template data provided by a callback function
if ok && renderPageDataCb != nil {
dataMap["extdata"] = renderPageDataCb(request)
data = dataMap
}

if err := tmpl.Execute(response, data); err != nil {
programError(response, fmt.Sprintf(`Template "%s" could not be executed`, htmlTemplate), "Could not execute template", err)
}
Expand Down