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https://github.com/RGBCube/serenity
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7966fc4780
The spec defines a Permissions Policy to control some browser behaviors on a per-origin basis. Management of these permissions live in their own spec: https://w3c.github.io/webappsec-permissions-policy/ This implements a somewhat ad-hoc Permissions Policy for autoplaying media elements. We will need to implement the entire policy spec for this to be more general.
91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
/*
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* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/String.h>
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#include <AK/URL.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/HTML/Origin.h>
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#include <LibWeb/PermissionsPolicy/AutoplayAllowlist.h>
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#include <LibWeb/URL/URL.h>
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// FIXME: This is an ad-hoc implementation of the "autoplay" policy-controlled feature:
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// https://w3c.github.io/webappsec-permissions-policy/#policy-controlled-feature
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namespace Web::PermissionsPolicy {
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AutoplayAllowlist& AutoplayAllowlist::the()
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{
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static AutoplayAllowlist filter;
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return filter;
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}
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AutoplayAllowlist::AutoplayAllowlist() = default;
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AutoplayAllowlist::~AutoplayAllowlist() = default;
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// https://w3c.github.io/webappsec-permissions-policy/#is-feature-enabled
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Decision AutoplayAllowlist::is_allowed_for_origin(DOM::Document const& document, HTML::Origin const& origin) const
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{
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// FIXME: 1. Let policy be document’s Permissions Policy
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// FIXME: 2. If policy’s inherited policy for feature is Disabled, return "Disabled".
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// 3. If feature is present in policy’s declared policy:
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if (m_allowlist.has_value()) {
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// 1. If the allowlist for feature in policy’s declared policy matches origin, then return "Enabled".
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// 2. Otherwise return "Disabled".
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return m_allowlist->visit(
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[](Global) {
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return Decision::Enabled;
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},
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[&](auto const& patterns) {
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for (auto const& pattern : patterns) {
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if (pattern.is_same_origin_domain(origin))
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return Decision::Enabled;
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}
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return Decision::Disabled;
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});
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}
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// 4. If feature’s default allowlist is *, return "Enabled".
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// 5. If feature’s default allowlist is 'self', and origin is same origin with document’s origin, return "Enabled".
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// NOTE: The "autoplay" feature's default allowlist is 'self'.
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// https://html.spec.whatwg.org/multipage/infrastructure.html#autoplay-feature
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if (origin.is_same_origin(document.origin()))
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return Decision::Enabled;
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// 6. Return "Disabled".
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return Decision::Disabled;
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}
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void AutoplayAllowlist::enable_globally()
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{
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m_allowlist = Global {};
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}
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ErrorOr<void> AutoplayAllowlist::enable_for_origins(ReadonlySpan<String> origins)
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{
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m_allowlist = Patterns {};
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auto& allowlist = m_allowlist->get<Patterns>();
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TRY(allowlist.try_ensure_capacity(origins.size()));
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for (auto const& origin : origins) {
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AK::URL url { origin };
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if (!url.is_valid())
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url = TRY(String::formatted("https://{}", origin));
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if (!url.is_valid()) {
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dbgln("Invalid origin for autoplay allowlist: {}", origin);
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continue;
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}
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TRY(allowlist.try_append(URL::url_origin(url)));
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}
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return {};
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}
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}
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