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Add variable argument fetchPropsToMatch to json-prune scriptlet
`fetchPropsToMatch` is an optional variable argument. If provided, the scriplet will take effect only when the JSON data is obtained through `Response.json()` and if there is a match with the value of `fetchPropsToMatch` and the properties of the `Response` instance. Examples of usage: ...##+js(json-prune, ads, , , fetchPropsToMatch, ?param=) ...##+js(json-prune, ads, , , fetchPropsToMatch, url:?param= method:get) The optional variable argument `fetchPropsToMatch` acts as an additional narrowing condition to fulfill before the JSON data is pruned.
This commit is contained in:
Raymond Hill
parent
8bf1ed954d
commit
f8394ff2d5
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@ -634,14 +634,14 @@ function objectPrune(
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obj,
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rawPrunePaths,
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rawNeedlePaths,
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stackNeedleDetails = { matchAll: true }
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stackNeedleDetails = { matchAll: true },
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extraArgs = {}
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) {
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if ( typeof rawPrunePaths !== 'string' ) { return obj; }
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const prunePaths = rawPrunePaths !== ''
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? rawPrunePaths.split(/ +/)
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: [];
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const safe = safeSelf();
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const extraArgs = safe.getExtraArgs(Array.from(arguments), 4);
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let needlePaths;
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let log, reLogNeedle;
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if ( prunePaths.length !== 0 ) {
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@ -869,6 +869,67 @@ function matchesStackTrace(
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return r;
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}
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/******************************************************************************/
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builtinScriptlets.push({
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name: 'parse-properties-to-match.fn',
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fn: parsePropertiesToMatch,
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dependencies: [
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'safe-self.fn',
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],
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});
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function parsePropertiesToMatch(propsToMatch, implicit = '') {
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const safe = safeSelf();
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const needles = new Map();
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if ( propsToMatch === undefined || propsToMatch === '' ) { return needles; }
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for ( const needle of propsToMatch.split(/\s+/) ) {
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const [ prop, pattern ] = needle.split(':');
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if ( prop === '' ) { continue; }
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if ( pattern !== undefined ) {
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needles.set(prop, { pattern, re: safe.patternToRegex(pattern) });
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} else if ( implicit !== '' ) {
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needles.set(implicit, { pattern: prop, re: safe.patternToRegex(prop) });
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}
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}
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return needles;
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}
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/******************************************************************************/
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builtinScriptlets.push({
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name: 'match-object-properties.fn',
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fn: matchObjectProperties,
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});
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function matchObjectProperties(propNeedles, ...objs) {
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if ( matchObjectProperties.extractProperties === undefined ) {
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matchObjectProperties.extractProperties = (src, des, props) => {
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for ( const p of props ) {
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const v = src[p];
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if ( v === undefined ) { continue; }
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des[p] = src[p];
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}
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};
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}
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const haystack = {};
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const props = Array.from(propNeedles.keys());
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for ( const obj of objs ) {
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if ( obj instanceof Object === false ) { continue; }
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matchObjectProperties.extractProperties(obj, haystack, props);
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}
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for ( const [ prop, details ] of propNeedles ) {
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let value = haystack[prop];
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if ( value === undefined ) { continue; }
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if ( typeof value !== 'string' ) {
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try { value = JSON.stringify(value); }
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catch(ex) { }
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}
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if ( typeof value !== 'string' ) { continue; }
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if ( details.re.test(value) ) { continue; }
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return false;
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}
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return true;
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}
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/*******************************************************************************
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Injectable scriptlets
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@ -1125,8 +1186,11 @@ builtinScriptlets.push({
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name: 'json-prune.js',
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fn: jsonPrune,
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dependencies: [
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'match-object-properties.fn',
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'object-prune.fn',
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'parse-properties-to-match.fn',
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'safe-self.fn',
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'should-log.fn',
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],
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});
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// When no "prune paths" argument is provided, the scriptlet is
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@ -1142,29 +1206,45 @@ function jsonPrune(
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) {
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const safe = safeSelf();
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const stackNeedleDetails = safe.initPattern(stackNeedle, { canNegate: true });
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const extraArgs = Array.from(arguments).slice(3);
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JSON.parse = new Proxy(JSON.parse, {
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apply: function(target, thisArg, args) {
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return objectPrune(
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Reflect.apply(target, thisArg, args),
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rawPrunePaths,
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rawNeedlePaths,
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stackNeedleDetails,
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...extraArgs
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);
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},
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});
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Response.prototype.json = new Proxy(Response.prototype.json, {
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apply: function(target, thisArg, args) {
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return Reflect.apply(target, thisArg, args).then(o =>
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objectPrune(
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o,
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const extraArgs = safe.getExtraArgs(Array.from(arguments), 3);
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const logLevel = shouldLog(extraArgs);
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const fetchPropNeedles = parsePropertiesToMatch(extraArgs.fetchPropsToMatch, 'url');
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if ( fetchPropNeedles.size === 0 ) {
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JSON.parse = new Proxy(JSON.parse, {
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apply: function(target, thisArg, args) {
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return objectPrune(
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Reflect.apply(target, thisArg, args),
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rawPrunePaths,
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rawNeedlePaths,
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stackNeedleDetails,
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...extraArgs
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)
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);
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extraArgs
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);
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},
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});
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}
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Response.prototype.json = new Proxy(Response.prototype.json, {
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apply: function(target, thisArg, args) {
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const dataPromise = Reflect.apply(target, thisArg, args);
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if ( fetchPropNeedles.size !== 0 ) {
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const outcome = matchObjectProperties(fetchPropNeedles, thisArg)
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? 'match'
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: 'nomatch';
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if ( outcome === logLevel || logLevel === 'all' ) {
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safe.uboLog(
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`json-prune (${outcome})`,
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`\n\tpropsToMatch: ${JSON.stringify(Array.from(fetchPropNeedles)).slice(1,-1)}`,
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'\n\tprops:', thisArg,
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);
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}
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if ( outcome === 'nomatch' ) { return dataPromise; }
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}
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return dataPromise.then(data => objectPrune(
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data,
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rawPrunePaths,
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rawNeedlePaths,
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stackNeedleDetails,
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extraArgs
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));
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},
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});
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}
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@ -3316,6 +3396,8 @@ builtinScriptlets.push({
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requiresTrust: true,
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fn: trustedReplaceFetchResponse,
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dependencies: [
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'match-object-properties.fn',
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'parse-properties-to-match.fn',
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'safe-self.fn',
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'should-log.fn',
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],
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@ -3333,22 +3415,7 @@ function trustedReplaceFetchResponse(
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const log = logLevel ? ((...args) => { safe.uboLog(...args); }) : (( ) => { });
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if ( pattern === '*' ) { pattern = '.*'; }
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const rePattern = safe.patternToRegex(pattern);
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const propNeedles = new Map();
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for ( const needle of propsToMatch.split(/\s+/) ) {
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const [ prop, value ] = needle.split(':');
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if ( prop === '' ) { continue; }
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if ( value === undefined ) {
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propNeedles.set('url', prop);
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} else {
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propNeedles.set(prop, value);
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}
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}
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const propReducer = (src, des, prop) => {
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if ( src[prop] !== undefined ) {
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des[prop] = src[prop];
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}
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return des;
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};
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const propNeedles = parsePropertiesToMatch(propsToMatch, 'url');
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self.fetch = new Proxy(self.fetch, {
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apply: function(target, thisArg, args) {
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if ( logLevel === true ) {
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@ -3358,51 +3425,35 @@ function trustedReplaceFetchResponse(
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if ( pattern === '' ) { return fetchPromise; }
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let outcome = 'match';
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if ( propNeedles.size !== 0 ) {
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const props = [
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'cache', 'credentials', 'destination', 'method',
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'mode', 'redirect', 'referrer', 'referrer-policy',
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'url',
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];
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const normalArgs = args[0] instanceof Object
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? props.reduce((a, p) => propReducer(args[0], a, p), {})
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: { url: args[0] };
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const objs = [ args[0] instanceof Object ? args[0] : { url: args[0] } ];
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if ( args[1] instanceof Object ) {
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props.reduce((a, p) => propReducer(args[0], a, p), normalArgs);
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objs.push(args[1]);
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}
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for ( const prop of props ) {
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let value = normalArgs[prop];
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if ( value === undefined ) { continue; }
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if ( typeof value !== 'string' ) {
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try { value = JSON.stringify(value); }
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catch(ex) { }
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}
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if ( typeof value !== 'string' ) { continue; }
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const needle = propNeedles.get(prop);
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if ( needle === undefined ) { continue; }
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if ( safe.patternToRegex(needle).test(value) ) { continue; }
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if ( matchObjectProperties(propNeedles, ...objs) === false ) {
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outcome = 'nomatch';
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break;
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}
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if ( outcome === logLevel || logLevel === 'all' ) {
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log(
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`trusted-replace-fetch-response (${outcome})`,
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`\n\tpropsToMatch: ${JSON.stringify(Array.from(propNeedles)).slice(1,-1)}`,
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`\n\tprops: ${JSON.stringify(normalArgs).slice(1,-1)}`,
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'\n\tprops:', ...args,
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);
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}
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}
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if ( outcome === 'nomatch' ) { return fetchPromise; }
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return fetchPromise.then(responseBefore => {
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return responseBefore.text().then(textBefore => {
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const response = responseBefore.clone();
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return response.text().then(textBefore => {
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const textAfter = textBefore.replace(rePattern, replacement);
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const outcome = textAfter !== textBefore ? 'match' : 'nomatch';
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if ( outcome === logLevel || logLevel === 'all' ) {
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log(
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`trusted-replace-fetch-response (${outcome})`,
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`\n\tpattern: ${rePattern.source}`,
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`\n\tpattern: ${pattern}`,
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`\n\treplacement: ${replacement}`,
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);
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}
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if ( outcome === 'nomatch' ) { return responseBefore; }
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const responseAfter = new Response(textAfter, {
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status: responseBefore.status,
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statusText: responseBefore.statusText,
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