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svelte/1: Add csp_nonce parameter #191

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svelte/1: Add csp_nonce parameter
xtian Oct 24, 2025
314f370
svelte/1: Add csp_script_nonce and csp_style_nonce parameters
xtian Oct 26, 2025
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29 changes: 23 additions & 6 deletions lib/live_svelte.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,18 @@ defmodule LiveSvelte do
doc: "Class to apply to the Svelte component",
examples: ["my-class", "my-class another-class"]

attr :csp_nonce, :string,
default: nil,
doc: "A Content-Security-Policy nonce for the generated <script> and <style> tags"

attr :csp_script_nonce, :string,
default: nil,
doc: "A Content-Security-Policy nonce for the generated <script> tag"

attr :csp_style_nonce, :string,
default: nil,
doc: "A Content-Security-Policy nonce for the generated <style> tag"

attr :ssr, :boolean,
default: true,
doc: "Whether to render the component via NodeJS on the server",
Expand Down Expand Up @@ -83,15 +95,20 @@ defmodule LiveSvelte do
end
end

csp_attrs = if(nonce = assigns.csp_nonce, do: [nonce: nonce])

assigns =
assigns
|> assign(:init, init)
|> assign(:slots, slots)
|> assign(:ssr_render, ssr_code)
assign(assigns,
csp_script_attrs: csp_attrs || if(nonce = assigns.csp_script_nonce, do: [nonce: nonce]),
csp_style_attrs: csp_attrs || if(nonce = assigns.csp_style_nonce, do: [nonce: nonce]),
init: init,
slots: slots,
ssr_render: ssr_code
)

~H"""
<.live_json live_json_props={@live_json_props}>
<script>
<script {@csp_script_attrs}>
<%= raw(@ssr_render["head"]) %>
</script>
<div
Expand All @@ -108,7 +125,7 @@ defmodule LiveSvelte do
class={@class}
>
<%= raw(@ssr_render["head"]) %>
<style>
<style {@csp_style_attrs}>
<%= raw(@ssr_render["css"]["code"]) %>
</style>
<%= raw(@ssr_render["html"]) %>
Expand Down