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| 1 | +'use strict' |
| 2 | + |
| 3 | +// This is a copy of [email protected]. It is inlined in elastic-apm-node |
| 4 | +// solely to update its `source-map` dependency to fix |
| 5 | +// https://github.com/elastic/apm-agent-nodejs/issues/2589 |
| 6 | +// If/when there is a new release of load-source-map with |
| 7 | +// https://github.com/rexxars/load-source-map/pull/6 |
| 8 | +// then we could move back to using load-source-map as a dependency. |
| 9 | + |
| 10 | +var fs = require('fs') |
| 11 | +var path = require('path') |
| 12 | +var SourceMapConsumer = require('source-map').SourceMapConsumer |
| 13 | + |
| 14 | +var INLINE_SOURCEMAP_REGEX = /^data:application\/json[^,]+base64,/ |
| 15 | +var SOURCEMAP_REGEX = /(?:\/\/[@#][ \t]+sourceMappingURL=([^\s'"]+?)[ \t]*$)|(?:\/\*[@#][ \t]+sourceMappingURL=([^*]+?)[ \t]*(?:\*\/)[ \t]*$)/ |
| 16 | +var READ_FILE_OPTS = { encoding: 'utf8' } |
| 17 | + |
| 18 | +module.exports = function readSourceMap (filename, cb) { |
| 19 | + fs.readFile(filename, READ_FILE_OPTS, function (err, sourceFile) { |
| 20 | + if (err) { |
| 21 | + return cb(err) |
| 22 | + } |
| 23 | + |
| 24 | + // Look for a sourcemap URL |
| 25 | + var sourceMapUrl = resolveSourceMapUrl(sourceFile, path.dirname(filename)) |
| 26 | + if (!sourceMapUrl) { |
| 27 | + return cb() |
| 28 | + } |
| 29 | + |
| 30 | + // If it's an inline map, decode it and pass it through the same consumer factory |
| 31 | + if (isInlineMap(sourceMapUrl)) { |
| 32 | + return onMapRead(null, decodeInlineMap(sourceMapUrl)) |
| 33 | + } |
| 34 | + |
| 35 | + // Load actual source map from given path |
| 36 | + fs.readFile(sourceMapUrl, READ_FILE_OPTS, onMapRead) |
| 37 | + |
| 38 | + function onMapRead (readErr, sourceMap) { |
| 39 | + if (readErr) { |
| 40 | + readErr.message = 'Error reading sourcemap for file "' + filename + '":\n' + readErr.message |
| 41 | + return cb(readErr) |
| 42 | + } |
| 43 | + |
| 44 | + try { |
| 45 | + (new SourceMapConsumer(sourceMap)) |
| 46 | + .then(function onConsumerReady (consumer) { |
| 47 | + return cb(null, consumer) |
| 48 | + }, onConsumerError) |
| 49 | + } catch (parseErr) { |
| 50 | + onConsumerError(parseErr) |
| 51 | + } |
| 52 | + } |
| 53 | + |
| 54 | + function onConsumerError (parseErr) { |
| 55 | + parseErr.message = 'Error parsing sourcemap for file "' + filename + '":\n' + parseErr.message |
| 56 | + return cb(parseErr) |
| 57 | + } |
| 58 | + }) |
| 59 | +} |
| 60 | + |
| 61 | +function resolveSourceMapUrl (sourceFile, sourcePath) { |
| 62 | + var lines = sourceFile.split(/\r?\n/) |
| 63 | + var sourceMapUrl = null |
| 64 | + for (var i = lines.length - 1; i >= 0 && !sourceMapUrl; i--) { |
| 65 | + sourceMapUrl = lines[i].match(SOURCEMAP_REGEX) |
| 66 | + } |
| 67 | + |
| 68 | + if (!sourceMapUrl) { |
| 69 | + return null |
| 70 | + } |
| 71 | + |
| 72 | + return isInlineMap(sourceMapUrl[1]) |
| 73 | + ? sourceMapUrl[1] |
| 74 | + : path.resolve(sourcePath, sourceMapUrl[1]) |
| 75 | +} |
| 76 | + |
| 77 | +function isInlineMap (url) { |
| 78 | + return INLINE_SOURCEMAP_REGEX.test(url) |
| 79 | +} |
| 80 | + |
| 81 | +function decodeInlineMap (data) { |
| 82 | + var rawData = data.slice(data.indexOf(',') + 1) |
| 83 | + return Buffer.from(rawData, 'base64').toString() |
| 84 | +} |
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