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package templ
import (
"context"
"encoding/json"
"fmt"
"io"
)
var _ Component = JSONScriptElement{}
// JSONScript renders a JSON object inside a script element.
// e.g. <script type="application/json">{"foo":"bar"}</script>
func JSONScript(id string, data any) JSONScriptElement {
return JSONScriptElement{
ID: id,
Type: "application/json",
Data: data,
Nonce: GetNonce,
}
}
// WithType sets the value of the type attribute of the script element.
func (j JSONScriptElement) WithType(t string) JSONScriptElement {
j.Type = t
return j
}
// WithNonceFromString sets the value of the nonce attribute of the script element to the given string.
func (j JSONScriptElement) WithNonceFromString(nonce string) JSONScriptElement {
j.Nonce = func(context.Context) string {
return nonce
}
return j
}
// WithNonceFrom sets the value of the nonce attribute of the script element to the value returned by the given function.
func (j JSONScriptElement) WithNonceFrom(f func(context.Context) string) JSONScriptElement {
j.Nonce = f
return j
}
type JSONScriptElement struct {
// ID of the element in the DOM.
ID string
// Type of the script element, defaults to "application/json".
Type string
// Data that will be encoded as JSON.
Data any
// Nonce is a function that returns a CSP nonce.
// Defaults to CSPNonceFromContext.
// See https://content-security-policy.com/nonce for more information.
Nonce func(ctx context.Context) string
}
func (j JSONScriptElement) Render(ctx context.Context, w io.Writer) (err error) {
if _, err = io.WriteString(w, "<script"); err != nil {
return err
}
if j.ID != "" {
if _, err = fmt.Fprintf(w, " id=\"%s\"", EscapeString(j.ID)); err != nil {
return err
}
}
if j.Type != "" {
if _, err = fmt.Fprintf(w, " type=\"%s\"", EscapeString(j.Type)); err != nil {
return err
}
}
if nonce := j.Nonce(ctx); nonce != "" {
if _, err = fmt.Fprintf(w, " nonce=\"%s\"", EscapeString(nonce)); err != nil {
return err
}
}
if _, err = io.WriteString(w, ">"); err != nil {
return err
}
if err = json.NewEncoder(w).Encode(j.Data); err != nil {
return err
}
if _, err = io.WriteString(w, "</script>"); err != nil {
return err
}
return nil
}
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