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Add commentary to token-generator, and move token-alpha to top level

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Shane Kilkelly 2017-10-13 11:37:38 +01:00
parent ac513a1355
commit 490ccc6051
1 changed files with 16 additions and 1 deletions
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17
services/web/app/coffee/Features/Project/ProjectTokenGenerator.coffee
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@ -1,14 +1,29 @@
crypto = require 'crypto'
# This module mirrors the token generation in Overleaf (`random_token.rb`),
# for the purposes of implementing token-based project access, like the
# 'unlisted-projects' feature in Overleaf
module.exports = ProjectTokenGenerator =
# (From Overleaf `random_token.rb`)
# Letters (not numbers! see generate_token) used in tokens. They're all
# consonsants, to avoid embarassing words (I can't think of any that use only
# a y), and lower case "l" is omitted, because in many fonts it is
# indistinguishable from an upper case "I" (and sometimes even the number 1).
TOKEN_ALPHA: 'bcdfghjkmnpqrstvwxyz'
# Generate a 12-char token with only characters from TOKEN_ALPHA,
# suitable for use as a read-only token for a project
readOnlyToken: () ->
length = 12
tokenAlpha = 'bcdfghjkmnpqrstvwxyz'
tokenAlpha = ProjectTokenGenerator.TOKEN_ALPHA
result = ''
crypto.randomBytes(length).map( (a) -> result += tokenAlpha[a % tokenAlpha.length] )
return result
# Generate a longer token, with a numeric prefix,
# suitable for use as a read-and-write token for a project
readAndWriteToken: () ->
numerics = Math.random().toString().slice(2, 12)
token = ProjectTokenGenerator.readOnlyToken()