source: trip-planner-front/node_modules/log4js/lib/connect-logger.js@ 6a3a178

Last change on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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Line 
1/* eslint-disable no-plusplus */
2
3const levels = require("./levels");
4
5const DEFAULT_FORMAT =
6 ":remote-addr - -" +
7 ' ":method :url HTTP/:http-version"' +
8 ' :status :content-length ":referrer"' +
9 ' ":user-agent"';
10
11/**
12 * Return request url path,
13 * adding this function prevents the Cyclomatic Complexity,
14 * for the assemble_tokens function at low, to pass the tests.
15 *
16 * @param {IncomingMessage} req
17 * @return {string}
18 * @api private
19 */
20function getUrl(req) {
21 return req.originalUrl || req.url;
22}
23
24/**
25 * Adds custom {token, replacement} objects to defaults,
26 * overwriting the defaults if any tokens clash
27 *
28 * @param {IncomingMessage} req
29 * @param {ServerResponse} res
30 * @param {Array} customTokens
31 * [{ token: string-or-regexp, replacement: string-or-replace-function }]
32 * @return {Array}
33 */
34function assembleTokens(req, res, customTokens) {
35 const arrayUniqueTokens = array => {
36 const a = array.concat();
37 for (let i = 0; i < a.length; ++i) {
38 for (let j = i + 1; j < a.length; ++j) {
39 // not === because token can be regexp object
40 /* eslint eqeqeq:0 */
41 if (a[i].token == a[j].token) {
42 a.splice(j--, 1);
43 }
44 }
45 }
46 return a;
47 };
48
49 const defaultTokens = [];
50 defaultTokens.push({ token: ":url", replacement: getUrl(req) });
51 defaultTokens.push({ token: ":protocol", replacement: req.protocol });
52 defaultTokens.push({ token: ":hostname", replacement: req.hostname });
53 defaultTokens.push({ token: ":method", replacement: req.method });
54 defaultTokens.push({
55 token: ":status",
56 replacement: res.__statusCode || res.statusCode
57 });
58 defaultTokens.push({
59 token: ":response-time",
60 replacement: res.responseTime
61 });
62 defaultTokens.push({ token: ":date", replacement: new Date().toUTCString() });
63 defaultTokens.push({
64 token: ":referrer",
65 replacement: req.headers.referer || req.headers.referrer || ""
66 });
67 defaultTokens.push({
68 token: ":http-version",
69 replacement: `${req.httpVersionMajor}.${req.httpVersionMinor}`
70 });
71 defaultTokens.push({
72 token: ":remote-addr",
73 replacement:
74 req.headers["x-forwarded-for"] ||
75 req.ip ||
76 req._remoteAddress ||
77 (req.socket &&
78 (req.socket.remoteAddress ||
79 (req.socket.socket && req.socket.socket.remoteAddress)))
80 });
81 defaultTokens.push({
82 token: ":user-agent",
83 replacement: req.headers["user-agent"]
84 });
85 defaultTokens.push({
86 token: ":content-length",
87 replacement:
88 res.getHeader("content-length") ||
89 (res.__headers && res.__headers["Content-Length"]) ||
90 "-"
91 });
92 defaultTokens.push({
93 token: /:req\[([^\]]+)]/g,
94 replacement(_, field) {
95 return req.headers[field.toLowerCase()];
96 }
97 });
98 defaultTokens.push({
99 token: /:res\[([^\]]+)]/g,
100 replacement(_, field) {
101 return (
102 res.getHeader(field.toLowerCase()) ||
103 (res.__headers && res.__headers[field])
104 );
105 }
106 });
107
108 return arrayUniqueTokens(customTokens.concat(defaultTokens));
109}
110
111/**
112 * Return formatted log line.
113 *
114 * @param {string} str
115 * @param {Array} tokens
116 * @return {string}
117 * @api private
118 */
119function format(str, tokens) {
120 for (let i = 0; i < tokens.length; i++) {
121 str = str.replace(tokens[i].token, tokens[i].replacement);
122 }
123 return str;
124}
125
126/**
127 * Return RegExp Object about nolog
128 *
129 * @param {(string|Array)} nolog
130 * @return {RegExp}
131 * @api private
132 *
133 * syntax
134 * 1. String
135 * 1.1 "\\.gif"
136 * NOT LOGGING http://example.com/hoge.gif and http://example.com/hoge.gif?fuga
137 * LOGGING http://example.com/hoge.agif
138 * 1.2 in "\\.gif|\\.jpg$"
139 * NOT LOGGING http://example.com/hoge.gif and
140 * http://example.com/hoge.gif?fuga and http://example.com/hoge.jpg?fuga
141 * LOGGING http://example.com/hoge.agif,
142 * http://example.com/hoge.ajpg and http://example.com/hoge.jpg?hoge
143 * 1.3 in "\\.(gif|jpe?g|png)$"
144 * NOT LOGGING http://example.com/hoge.gif and http://example.com/hoge.jpeg
145 * LOGGING http://example.com/hoge.gif?uid=2 and http://example.com/hoge.jpg?pid=3
146 * 2. RegExp
147 * 2.1 in /\.(gif|jpe?g|png)$/
148 * SAME AS 1.3
149 * 3. Array
150 * 3.1 ["\\.jpg$", "\\.png", "\\.gif"]
151 * SAME AS "\\.jpg|\\.png|\\.gif"
152 */
153function createNoLogCondition(nolog) {
154 let regexp = null;
155
156 if (nolog instanceof RegExp) {
157 regexp = nolog;
158 }
159
160 if (typeof nolog === "string") {
161 regexp = new RegExp(nolog);
162 }
163
164 if (Array.isArray(nolog)) {
165 // convert to strings
166 const regexpsAsStrings = nolog.map(reg => (reg.source ? reg.source : reg));
167 regexp = new RegExp(regexpsAsStrings.join("|"));
168 }
169
170 return regexp;
171}
172
173/**
174 * Allows users to define rules around status codes to assign them to a specific
175 * logging level.
176 * There are two types of rules:
177 * - RANGE: matches a code within a certain range
178 * E.g. { 'from': 200, 'to': 299, 'level': 'info' }
179 * - CONTAINS: matches a code to a set of expected codes
180 * E.g. { 'codes': [200, 203], 'level': 'debug' }
181 * Note*: Rules are respected only in order of prescendence.
182 *
183 * @param {Number} statusCode
184 * @param {Level} currentLevel
185 * @param {Object} ruleSet
186 * @return {Level}
187 * @api private
188 */
189function matchRules(statusCode, currentLevel, ruleSet) {
190 let level = currentLevel;
191
192 if (ruleSet) {
193 const matchedRule = ruleSet.find(rule => {
194 let ruleMatched = false;
195 if (rule.from && rule.to) {
196 ruleMatched = statusCode >= rule.from && statusCode <= rule.to;
197 } else {
198 ruleMatched = rule.codes.indexOf(statusCode) !== -1;
199 }
200 return ruleMatched;
201 });
202 if (matchedRule) {
203 level = levels.getLevel(matchedRule.level, level);
204 }
205 }
206 return level;
207}
208
209/**
210 * Log requests with the given `options` or a `format` string.
211 *
212 * Options:
213 *
214 * - `format` Format string, see below for tokens
215 * - `level` A log4js levels instance. Supports also 'auto'
216 * - `nolog` A string or RegExp to exclude target logs
217 * - `statusRules` A array of rules for setting specific logging levels base on status codes
218 * - `context` Whether to add a response of express to the context
219 *
220 * Tokens:
221 *
222 * - `:req[header]` ex: `:req[Accept]`
223 * - `:res[header]` ex: `:res[Content-Length]`
224 * - `:http-version`
225 * - `:response-time`
226 * - `:remote-addr`
227 * - `:date`
228 * - `:method`
229 * - `:url`
230 * - `:referrer`
231 * - `:user-agent`
232 * - `:status`
233 *
234 * @return {Function}
235 * @param logger4js
236 * @param options
237 * @api public
238 */
239module.exports = function getLogger(logger4js, options) {
240 /* eslint no-underscore-dangle:0 */
241 if (typeof options === "string" || typeof options === "function") {
242 options = { format: options };
243 } else {
244 options = options || {};
245 }
246
247 const thisLogger = logger4js;
248 let level = levels.getLevel(options.level, levels.INFO);
249 const fmt = options.format || DEFAULT_FORMAT;
250 const nolog = createNoLogCondition(options.nolog);
251
252 return (req, res, next) => {
253 // mount safety
254 if (req._logging) return next();
255
256 // nologs
257 if (nolog && nolog.test(req.originalUrl)) return next();
258
259 if (thisLogger.isLevelEnabled(level) || options.level === "auto") {
260 const start = new Date();
261 const { writeHead } = res;
262
263 // flag as logging
264 req._logging = true;
265
266 // proxy for statusCode.
267 res.writeHead = (code, headers) => {
268 res.writeHead = writeHead;
269 res.writeHead(code, headers);
270
271 res.__statusCode = code;
272 res.__headers = headers || {};
273 };
274
275 // hook on end request to emit the log entry of the HTTP request.
276 res.on("finish", () => {
277 res.responseTime = new Date() - start;
278 // status code response level handling
279 if (res.statusCode && options.level === "auto") {
280 level = levels.INFO;
281 if (res.statusCode >= 300) level = levels.WARN;
282 if (res.statusCode >= 400) level = levels.ERROR;
283 }
284 level = matchRules(res.statusCode, level, options.statusRules);
285
286 const combinedTokens = assembleTokens(req, res, options.tokens || []);
287
288 if (options.context) thisLogger.addContext("res", res);
289 if (typeof fmt === "function") {
290 const line = fmt(req, res, str => format(str, combinedTokens));
291 if (line) thisLogger.log(level, line);
292 } else {
293 thisLogger.log(level, format(fmt, combinedTokens));
294 }
295 if (options.context) thisLogger.removeContext("res");
296 });
297 }
298
299 // ensure next gets always called
300 return next();
301 };
302};
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