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const {
ArrayPrototypeMap,
JSONParse,
ObjectCreate,
ObjectKeys,
ObjectGetOwnPropertyDescriptor,
ObjectPrototypeHasOwnProperty,
RegExpPrototypeExec,
RegExpPrototypeSymbolSplit,
SafeMap,
StringPrototypeSplit,
} = primordials;
function ObjectGetValueSafe(obj, key) {
const desc = ObjectGetOwnPropertyDescriptor(obj, key);
return ObjectPrototypeHasOwnProperty(desc, 'value') ? desc.value : undefined;
}
// See https://sourcemaps.info/spec.html for SourceMap V3 specification.
const { Buffer } = require('buffer');
let debug = require('internal/util/debuglog').debuglog('source_map', (fn) => {
debug = fn;
});
const fs = require('fs');
const { getOptionValue } = require('internal/options');
const { IterableWeakMap } = require('internal/util/iterable_weak_map');
const {
normalizeReferrerURL,
} = require('internal/modules/cjs/helpers');
const { validateBoolean } = require('internal/validators');
const { setMaybeCacheGeneratedSourceMap } = internalBinding('errors');
// Since the CJS module cache is mutable, which leads to memory leaks when
// modules are deleted, we use a WeakMap so that the source map cache will
// be purged automatically:
const cjsSourceMapCache = new IterableWeakMap();
// The esm cache is not mutable, so we can use a Map without memory concerns:
const esmSourceMapCache = new SafeMap();
// The generated sources is not mutable, so we can use a Map without memory concerns:
const generatedSourceMapCache = new SafeMap();
const kLeadingProtocol = /^\w+:\/\//;
const kSourceMappingURLMagicComment = /\/[*/]#\s+sourceMappingURL=(?<sourceMappingURL>[^\s]+)/g;
const kSourceURLMagicComment = /\/[*/]#\s+sourceURL=(?<sourceURL>[^\s]+)/g;
const { fileURLToPath, pathToFileURL, URL } = require('internal/url');
let SourceMap;
let sourceMapsEnabled;
function getSourceMapsEnabled() {
if (sourceMapsEnabled === undefined) {
setSourceMapsEnabled(getOptionValue('--enable-source-maps'));
}
return sourceMapsEnabled;
}
function setSourceMapsEnabled(val) {
validateBoolean(val, 'val');
const {
setSourceMapsEnabled,
setPrepareStackTraceCallback
} = internalBinding('errors');
setSourceMapsEnabled(val);
if (val) {
const {
prepareStackTrace
} = require('internal/source_map/prepare_stack_trace');
setPrepareStackTraceCallback(prepareStackTrace);
} else if (sourceMapsEnabled !== undefined) {
// Reset prepare stack trace callback only when disabling source maps.
const {
prepareStackTrace,
} = require('internal/errors');
setPrepareStackTraceCallback(prepareStackTrace);
}
sourceMapsEnabled = val;
}
function extractSourceURLMagicComment(content) {
let match;
let matchSourceURL;
// A while loop is used here to get the last occurrence of sourceURL.
// This is needed so that we don't match sourceURL in string literals.
while ((match = RegExpPrototypeExec(kSourceURLMagicComment, content))) {
matchSourceURL = match;
}
if (matchSourceURL == null) {
return null;
}
let sourceURL = matchSourceURL.groups.sourceURL;
if (sourceURL != null && RegExpPrototypeExec(kLeadingProtocol, sourceURL) === null) {
sourceURL = pathToFileURL(sourceURL).href;
}
return sourceURL;
}
function maybeCacheSourceMap(filename, content, cjsModuleInstance, isGeneratedSource, sourceURL) {
const sourceMapsEnabled = getSourceMapsEnabled();
if (!(process.env.NODE_V8_COVERAGE || sourceMapsEnabled)) return;
try {
filename = normalizeReferrerURL(filename);
} catch (err) {
// This is most likely an invalid filename in sourceURL of [eval]-wrapper.
debug(err);
return;
}
let match;
let lastMatch;
// A while loop is used here to get the last occurrence of sourceMappingURL.
// This is needed so that we don't match sourceMappingURL in string literals.
while ((match = RegExpPrototypeExec(kSourceMappingURLMagicComment, content))) {
lastMatch = match;
}
if (sourceURL === undefined) {
sourceURL = extractSourceURLMagicComment(content);
}
if (lastMatch) {
const data = dataFromUrl(filename, lastMatch.groups.sourceMappingURL);
const url = data ? null : lastMatch.groups.sourceMappingURL;
if (cjsModuleInstance) {
cjsSourceMapCache.set(cjsModuleInstance, {
filename,
lineLengths: lineLengths(content),
data,
url,
sourceURL,
});
} else if (isGeneratedSource) {
const entry = {
lineLengths: lineLengths(content),
data,
url,
sourceURL
};
generatedSourceMapCache.set(filename, entry);
if (sourceURL) {
generatedSourceMapCache.set(sourceURL, entry);
}
} else {
// If there is no cjsModuleInstance and is not generated source assume we are in a
// "modules/esm" context.
const entry = {
lineLengths: lineLengths(content),
data,
url,
sourceURL,
};
esmSourceMapCache.set(filename, entry);
if (sourceURL) {
esmSourceMapCache.set(sourceURL, entry);
}
}
}
}
function maybeCacheGeneratedSourceMap(content) {
const sourceMapsEnabled = getSourceMapsEnabled();
if (!(process.env.NODE_V8_COVERAGE || sourceMapsEnabled)) return;
const sourceURL = extractSourceURLMagicComment(content);
if (sourceURL === null) {
return;
}
try {
maybeCacheSourceMap(sourceURL, content, null, true, sourceURL);
} catch (err) {
// This can happen if the filename is not a valid URL.
// If we fail to cache the source map, we should not fail the whole process.
debug(err);
}
}
setMaybeCacheGeneratedSourceMap(maybeCacheGeneratedSourceMap);
function dataFromUrl(sourceURL, sourceMappingURL) {
try {
const url = new URL(sourceMappingURL);
switch (url.protocol) {
case 'data:':
return sourceMapFromDataUrl(sourceURL, url.pathname);
default:
debug(`unknown protocol ${url.protocol}`);
return null;
}
} catch (err) {
debug(err);
// If no scheme is present, we assume we are dealing with a file path.
const mapURL = new URL(sourceMappingURL, sourceURL).href;
return sourceMapFromFile(mapURL);
}
}
// Cache the length of each line in the file that a source map was extracted
// from. This allows translation from byte offset V8 coverage reports,
// to line/column offset Source Map V3.
function lineLengths(content) {
// We purposefully keep \r as part of the line-length calculation, in
// cases where there is a \r\n separator, so that this can be taken into
// account in coverage calculations.
return ArrayPrototypeMap(RegExpPrototypeSymbolSplit(/\n|\u2028|\u2029/, content), (line) => {
return line.length;
});
}
function sourceMapFromFile(mapURL) {
try {
const content = fs.readFileSync(fileURLToPath(mapURL), 'utf8');
const data = JSONParse(content);
return sourcesToAbsolute(mapURL, data);
} catch (err) {
debug(err);
return null;
}
}
// data:[<mediatype>][;base64],<data> see:
// https://tools.ietf.org/html/rfc2397#section-2
function sourceMapFromDataUrl(sourceURL, url) {
const { 0: format, 1: data } = StringPrototypeSplit(url, ',');
const splitFormat = StringPrototypeSplit(format, ';');
const contentType = splitFormat[0];
const base64 = splitFormat[splitFormat.length - 1] === 'base64';
if (contentType === 'application/json') {
const decodedData = base64 ?
Buffer.from(data, 'base64').toString('utf8') : data;
try {
const parsedData = JSONParse(decodedData);
return sourcesToAbsolute(sourceURL, parsedData);
} catch (err) {
debug(err);
return null;
}
} else {
debug(`unknown content-type ${contentType}`);
return null;
}
}
// If the sources are not absolute URLs after prepending of the "sourceRoot",
// the sources are resolved relative to the SourceMap (like resolving script
// src in a html document).
function sourcesToAbsolute(baseURL, data) {
data.sources = data.sources.map((source) => {
source = (data.sourceRoot || '') + source;
return new URL(source, baseURL).href;
});
// The sources array is now resolved to absolute URLs, sourceRoot should
// be updated to noop.
data.sourceRoot = '';
return data;
}
// WARNING: The `sourceMapCacheToObject` and `appendCJSCache` run during
// shutdown. In particular, they also run when Workers are terminated, making
// it important that they do not call out to any user-provided code, including
// built-in prototypes that might have been tampered with.
// Get serialized representation of source-map cache, this is used
// to persist a cache of source-maps to disk when NODE_V8_COVERAGE is enabled.
function sourceMapCacheToObject() {
const obj = ObjectCreate(null);
for (const { 0: k, 1: v } of esmSourceMapCache) {
obj[k] = v;
}
appendCJSCache(obj);
if (ObjectKeys(obj).length === 0) {
return undefined;
}
return obj;
}
function appendCJSCache(obj) {
for (const value of cjsSourceMapCache) {
obj[ObjectGetValueSafe(value, 'filename')] = {
lineLengths: ObjectGetValueSafe(value, 'lineLengths'),
data: ObjectGetValueSafe(value, 'data'),
url: ObjectGetValueSafe(value, 'url')
};
}
}
function findSourceMap(sourceURL) {
if (RegExpPrototypeExec(kLeadingProtocol, sourceURL) === null) {
sourceURL = pathToFileURL(sourceURL).href;
}
if (!SourceMap) {
SourceMap = require('internal/source_map/source_map').SourceMap;
}
let sourceMap = esmSourceMapCache.get(sourceURL) ?? generatedSourceMapCache.get(sourceURL);
if (sourceMap === undefined) {
for (const value of cjsSourceMapCache) {
const filename = ObjectGetValueSafe(value, 'filename');
const cachedSourceURL = ObjectGetValueSafe(value, 'sourceURL');
if (sourceURL === filename || sourceURL === cachedSourceURL) {
sourceMap = {
data: ObjectGetValueSafe(value, 'data')
};
}
}
}
if (sourceMap && sourceMap.data) {
return new SourceMap(sourceMap.data);
}
return undefined;
}
module.exports = {
findSourceMap,
getSourceMapsEnabled,
setSourceMapsEnabled,
maybeCacheSourceMap,
sourceMapCacheToObject,
};
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