git.squeep.com Git - squeep-indieauth-helper/blob - lib/common.js

   1 'use strict';
   2
   3 const path = require('path');
   4
   5 /**
   6  * Return a function which combines a part of the filename with a scope, for use in logging.
   7  * @param {string} filename
   8  */
   9 const fileScope = (filename) => {
  10   let fScope = path.basename(filename, '.js');
  11   if (fScope === 'index') {
  12     fScope = path.basename(path.dirname(filename));
  13   }
  14   return (scope) => `${fScope}:${scope}`;
  15 }
  16
  17
  18 /**
  19  * Pick out useful axios response fields.
  20  * @param {*} res
  21  * @returns
  22  */
  23 const axiosResponseLogData = (res) => {
  24   const data = pick(res, [
  25     'status',
  26     'statusText',
  27     'headers',
  28     'elapsedTimeMs',
  29     'data',
  30   ]);
  31   if (data.data) {
  32     data.data = logTruncate(data.data, 100);
  33   }
  34   return data;
  35 };
  36
  37
  38 /**
  39  * Limit length of string to keep logs sane
  40  * @param {String} str
  41  * @param {Number} len
  42  * @returns {String}
  43  */
  44 const logTruncate = (str, len) => {
  45   if (typeof str !== 'string' || str.toString().length <= len) {
  46     return str;
  47   }
  48   return str.toString().slice(0, len) + `... (${str.toString().length} bytes)`;
  49 };
  50
  51
  52 /**
  53  * Return a new object with selected props.
  54  * @param {Object} obj
  55  * @param {String[]} props
  56  */
  57 const pick = (obj, props) => {
  58   return props.reduce((acc, prop) => {
  59     if (prop in obj) {
  60       acc[prop] = obj[prop]; // eslint-disable-line security/detect-object-injection
  61     }
  62     return acc;
  63   }, {});
  64 };
  65
  66
  67 /**
  68  * Return a set containing non-shared items between two sets.
  69  * @param {Set} a
  70  * @param {Set} b
  71  * @returns {Set}
  72  */
  73 const setSymmetricDifference = (a, b) => {
  74   const d = new Set(a);
  75   for (const x of b) {
  76     if (d.has(x)) {
  77       d.delete(x);
  78     } else {
  79       d.add(x);
  80     }
  81   }
  82   return d;
  83 };
  84
  85
  86 /**
  87  * URL objects have weird names.
  88  * @param {String} component
  89  * @returns {String}
  90  */
  91 const properURLComponentName = (component) => {
  92   // eslint-disable-next-line security/detect-object-injection
  93   return {
  94     hash: 'fragment',
  95     protocol: 'scheme',
  96   }[component] || component;
  97 }
  98
  99
 100 module.exports = {
 101   fileScope,
 102   axiosResponseLogData,
 103   logTruncate,
 104   pick,
 105   setSymmetricDifference,
 106   properURLComponentName,
 107 };