1'use strict'
2
3var scopedPackagePattern = new RegExp('^(?:@([^/]+?)[/])?([^/]+?)$')
4var builtins = require('builtins')
5var blacklist = [
6  'node_modules',
7  'favicon.ico',
8]
9
10function validate (name) {
11  var warnings = []
12  var errors = []
13
14  if (name === null) {
15    errors.push('name cannot be null')
16    return done(warnings, errors)
17  }
18
19  if (name === undefined) {
20    errors.push('name cannot be undefined')
21    return done(warnings, errors)
22  }
23
24  if (typeof name !== 'string') {
25    errors.push('name must be a string')
26    return done(warnings, errors)
27  }
28
29  if (!name.length) {
30    errors.push('name length must be greater than zero')
31  }
32
33  if (name.match(/^\./)) {
34    errors.push('name cannot start with a period')
35  }
36
37  if (name.match(/^_/)) {
38    errors.push('name cannot start with an underscore')
39  }
40
41  if (name.trim() !== name) {
42    errors.push('name cannot contain leading or trailing spaces')
43  }
44
45  // No funny business
46  blacklist.forEach(function (blacklistedName) {
47    if (name.toLowerCase() === blacklistedName) {
48      errors.push(blacklistedName + ' is a blacklisted name')
49    }
50  })
51
52  // Generate warnings for stuff that used to be allowed
53
54  // core module names like http, events, util, etc
55  builtins({ version: '*' }).forEach(function (builtin) {
56    if (name.toLowerCase() === builtin) {
57      warnings.push(builtin + ' is a core module name')
58    }
59  })
60
61  if (name.length > 214) {
62    warnings.push('name can no longer contain more than 214 characters')
63  }
64
65  // mIxeD CaSe nAMEs
66  if (name.toLowerCase() !== name) {
67    warnings.push('name can no longer contain capital letters')
68  }
69
70  if (/[~'!()*]/.test(name.split('/').slice(-1)[0])) {
71    warnings.push('name can no longer contain special characters ("~\'!()*")')
72  }
73
74  if (encodeURIComponent(name) !== name) {
75    // Maybe it's a scoped package name, like @user/package
76    var nameMatch = name.match(scopedPackagePattern)
77    if (nameMatch) {
78      var user = nameMatch[1]
79      var pkg = nameMatch[2]
80      if (encodeURIComponent(user) === user && encodeURIComponent(pkg) === pkg) {
81        return done(warnings, errors)
82      }
83    }
84
85    errors.push('name can only contain URL-friendly characters')
86  }
87
88  return done(warnings, errors)
89}
90
91var done = function (warnings, errors) {
92  var result = {
93    validForNewPackages: errors.length === 0 && warnings.length === 0,
94    validForOldPackages: errors.length === 0,
95    warnings: warnings,
96    errors: errors,
97  }
98  if (!result.warnings.length) {
99    delete result.warnings
100  }
101  if (!result.errors.length) {
102    delete result.errors
103  }
104  return result
105}
106
107module.exports = validate
108