72 lines
2.3 KiB
Plaintext
72 lines
2.3 KiB
Plaintext
module Main where
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import Prelude
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import Effect (Effect)
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import Effect.Aff (Aff, launchAff)
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import Effect.Class (liftEffect)
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import Effect.Console (log)
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import Fetch (fetch)
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import Data.Base64 (decodeBase64, fromString)
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import Data.Either (Either, note)
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import Data.Maybe (Maybe(..))
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import Data.ArrayBuffer.Builder (execPut, putInt32be)
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import Data.ArrayBuffer.Types (ArrayBuffer)
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import Data.Foldable (traverse_)
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import Data.String (drop, indexOf', indexOf, splitAt)
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import Data.String.Pattern (Pattern(..))
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import Crypto.Subtle.Constants.AES (aesGCM, t128)
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import Crypto.Subtle.Encrypt (aesGCM, decrypt) as Alg
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import Crypto.Subtle.Key.Import (aes)
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import Crypto.Subtle.Key.Import (importKey) as SC
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import Crypto.Subtle.Key.Types (CryptoKey, decrypt, raw)
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nonceE :: Effect ArrayBuffer
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nonceE = execPut $ traverse_ putInt32be [0xd0, 0xc3, 0x75, 0x56, 0x58, 0xc1, 0x7e, 0x5f, 0xd6, 0xcc, 0xb6, 0x76]
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data AviaryError
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= MalformedKey
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| MalformedUrl
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| DecryptFailed
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instance showAviaryError :: Show AviaryError where
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show MalformedKey = "Malformed key!!"
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show MalformedUrl = "Malformed url!!"
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show DecryptFailed = "Either the data provided by the server was bad, or valid but incorrect key. Expiration likely."
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type UrlInfo =
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{ server :: String
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, fileId :: String
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, key :: String
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}
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parseUrl :: String -> Either AviaryError UrlInfo
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parseUrl url = note MalformedUrl do
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slashIndex <- indexOf' (Pattern "/") 8 url
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let { after, before: server } = splitAt (1 + slashIndex) url
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poundIndex <- indexOf (Pattern "#") after
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let { after: key, before: fileId } = splitAt poundIndex after
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Just { server, fileId, key: drop 1 key }
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decodeKey :: String -> Either AviaryError ArrayBuffer
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decodeKey key = note MalformedKey $ decodeBase64 <$> fromString key
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importKey :: ArrayBuffer -> Aff CryptoKey
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importKey key =
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SC.importKey raw key (aes aesGCM) false [decrypt]
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decryptBlob :: CryptoKey -> ArrayBuffer -> ArrayBuffer -> Aff ArrayBuffer
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decryptBlob key cyphertext nonce =
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-- nonce <- makeAff (\_ -> nonceE)
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Alg.decrypt (Alg.aesGCM nonce Nothing (Just t128)) key cyphertext
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main_aff :: Aff Unit
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main_aff = do
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{ status, text } <- fetch "https://envs.sh/Q_V.txt" {}
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responseText <- text
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liftEffect $ log responseText
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main :: Effect Unit
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main = launchAff main_aff $> unit
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