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30 lines
1.2 KiB
CoffeeScript
30 lines
1.2 KiB
CoffeeScript
crypto = require 'crypto'
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# This module mirrors the token generation in Overleaf (`random_token.rb`),
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# for the purposes of implementing token-based project access, like the
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# 'unlisted-projects' feature in Overleaf
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module.exports = ProjectTokenGenerator =
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# (From Overleaf `random_token.rb`)
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# Letters (not numbers! see generate_token) used in tokens. They're all
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# consonants, to avoid embarassing words (I can't think of any that use only
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# a y), and lower case "l" is omitted, because in many fonts it is
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# indistinguishable from an upper case "I" (and sometimes even the number 1).
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TOKEN_ALPHA: 'bcdfghjkmnpqrstvwxyz'
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# Generate a 12-char token with only characters from TOKEN_ALPHA,
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# suitable for use as a read-only token for a project
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readOnlyToken: () ->
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length = 12
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tokenAlpha = ProjectTokenGenerator.TOKEN_ALPHA
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result = ''
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crypto.randomBytes(length).map( (a) -> result += tokenAlpha[a % tokenAlpha.length] )
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return result
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# Generate a longer token, with a numeric prefix,
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# suitable for use as a read-and-write token for a project
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readAndWriteToken: () ->
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numerics = Math.random().toString().slice(2, 12)
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token = ProjectTokenGenerator.readOnlyToken()
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return "#{numerics}#{token}"
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