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44 lines
1.4 KiB
CoffeeScript
44 lines
1.4 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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TOKEN_NUMERICS: '123456789'
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_randomString: (length, alphabet) ->
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result = ''
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crypto.randomBytes(length).map(
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(b) -> result += alphabet[b % alphabet.length]
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)
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return result
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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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return ProjectTokenGenerator._randomString(
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12,
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ProjectTokenGenerator.TOKEN_ALPHA
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)
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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 = ProjectTokenGenerator._randomString(
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10,
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ProjectTokenGenerator.TOKEN_NUMERICS
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)
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token = ProjectTokenGenerator._randomString(
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12,
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ProjectTokenGenerator.TOKEN_ALPHA
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)
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fullToken = "#{numerics}#{token}"
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return fullToken
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