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extension: Don't add dynamic rules where responseHeaders rules ignored

This commit is contained in:
Daniel Jacobs 2024-06-17 11:37:49 -04:00
parent 3a47f8a20f
commit 38965e65e4
1 changed files with 59 additions and 11 deletions
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70
web/packages/extension/src/background.ts
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@ -8,8 +8,62 @@ async function contentScriptRegistered() {
return matchingScripts?.length > 0;
}
// Copied from https://github.com/w3c/webextensions/issues/638#issuecomment-2181124486
async function isHeaderConditionSupported() {
let needCleanup = false;
const ruleId = 4;
try {
// Throws synchronously if not supported.
await utils.declarativeNetRequest.updateDynamicRules({
addRules: [
{
id: ruleId,
condition: { responseHeaders: [{ header: "whatever" }] },
action: {
type:
chrome.declarativeNetRequest.RuleActionType
?.BLOCK ?? "block",
},
},
],
});
needCleanup = true;
} catch {
return false; // responseHeaders condition not supported.
}
// Chrome may recognize the properties but have the implementation behind a flag.
// When the implementation is disabled, validation is skipped too.
try {
await utils.declarativeNetRequest.updateDynamicRules({
removeRuleIds: [ruleId],
addRules: [
{
id: ruleId,
condition: { responseHeaders: [] },
action: {
type:
chrome.declarativeNetRequest.RuleActionType
?.BLOCK ?? "block",
},
},
],
});
needCleanup = true;
return false; // Validation skipped = feature disabled.
} catch {
return true; // Validation worked = feature enabled.
} finally {
if (needCleanup) {
await utils.declarativeNetRequest.updateDynamicRules({
removeRuleIds: [ruleId],
});
}
}
}
async function enable() {
if (utils.declarativeNetRequest) {
// Checks if the responseHeaders condition is supported and not behind a disabled flag.
if (utils.declarativeNetRequest && (await isHeaderConditionSupported())) {
const playerPage = utils.runtime.getURL("/player.html");
const rules = [
{
@ -83,16 +137,10 @@ async function enable() {
},
},
];
try {
await utils.declarativeNetRequest.updateDynamicRules({
removeRuleIds: [1, 2, 3],
addRules: rules,
});
} catch (e) {
console.info(
"Failed to register rules: responseHeaders condition unsupported",
);
}
await utils.declarativeNetRequest.updateDynamicRules({
removeRuleIds: [1, 2, 3],
addRules: rules,
});
}
if (
!utils.scripting ||