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Improve `trusted-replace-fetch-response` as per feedback 

Specifically, the variable argument `log` can take one of three
values to enable logging mechanism:

  ..., log, match => log only when there is a match
  ..., log, nomatch => log only when there is no match
  ..., log, all => log unconditionally
This commit is contained in:
Raymond Hill 2023-08-06 11:19:10 -04:00
parent 60fcdf8e71
commit 2c2fd5f21d
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GPG Key ID: 25E1490B761470C2
1 changed files with 34 additions and 16 deletions
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50
assets/resources/scriptlets.js
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@ -3358,7 +3358,11 @@ function trustedReplaceFetchResponse(
for ( const needle of propsToMatch.split(/\s+/) ) {
const [ prop, value ] = needle.split(':');
if ( prop === '' ) { continue; }
propNeedles.set(prop, patternToRegex(value));
if ( value === undefined ) {
propNeedles.set('url', prop);
} else {
propNeedles.set(prop, value);
}
}
self.fetch = new Proxy(self.fetch, {
apply: function(target, thisArg, args) {
@ -3367,19 +3371,17 @@ function trustedReplaceFetchResponse(
}
const fetchPromise = Reflect.apply(target, thisArg, args);
if ( pattern === '' ) { return fetchPromise; }
let skip = false;
let outcome = 'match';
if ( propNeedles.size !== 0 ) {
const fetchDetails = {};
if ( args[0] instanceof self.Request ) {
Object.assign(fetchDetails, args[0]);
} else {
Object.assign(fetchDetails, { url: args[0] });
}
if ( args[1] instanceof Object ) {
Object.assign(fetchDetails, args[1]);
}
for ( const prop of Object.keys(fetchDetails) ) {
let value = fetchDetails[prop];
const props = [
'cache', 'credentials', 'destination', 'method',
'redirect', 'referrer', 'referrer-policy', 'url',
];
const normalArgs = args[0] instanceof Object
? props.reduce((p, a) => { a[p] = args[0][p]; }, {})
: { url: args[0] };
for ( const prop of props ) {
let value = normalArgs[prop];
if ( typeof value !== 'string' ) {
try { value = JSON.stringify(value); }
catch(ex) { }
@ -3387,15 +3389,31 @@ function trustedReplaceFetchResponse(
if ( typeof value !== 'string' ) { continue; }
const needle = propNeedles.get(prop);
if ( needle === undefined ) { continue; }
if ( needle.test(value) ) { continue; }
skip = true;
if ( patternToRegex(needle).test(value) ) { continue; }
outcome = 'nomatch';
break;
}
if ( outcome === logLevel || logLevel === 'all' ) {
log(
`trusted-replace-fetch-response (${outcome})`,
`\n\tpropsToMatch: ${JSON.stringify(Array.from(propNeedles)).slice(1,-1)}`,
`\n\tprops: ${JSON.stringify(normalArgs).slice(1,-1)}`,
);
}
if ( skip ) { return fetchPromise; }
}
if ( outcome === 'nomatch' ) { return fetchPromise; }
return fetchPromise.then(responseBefore => {
return responseBefore.text().then(textBefore => {
const textAfter = textBefore.replace(rePattern, replacement);
const outcome = textAfter !== textBefore ? 'match' : 'nomatch';
if ( outcome === logLevel || logLevel === 'all' ) {
log(
`trusted-replace-fetch-response (${outcome})`,
`\n\tpattern: ${rePattern.source}`,
`\n\treplacement: ${replacement}`,
);
}
if ( textAfter === textBefore ) { return responseBefore; }
const responseAfter = new Response(textAfter, {
status: responseBefore.status,
statusText: responseBefore.statusText,