Data.Text.Lazy.Encoding.Base64.URL

Encode a Text value in Base64url with padding.

See: RFC-4648 section 5

Examples:

>>> encodeBase64 "<<?>>""PDw_Pj4="

Encode a Text value in Base64url without padding. Note that for Base64url, padding is optional. If you call this function, you will simply be encoding as Base64url and stripping padding chars from the output.

See: RFC-4648 section 3.2

Examples:

>>> encodeBase64Unpadded "<<?>>""PDw_Pj4"

Decode an arbitrarily Base64url-encoded Text value.

For typed values: - If a padded value is required, use decodeBase64Padded - If an unpadded value is required, use decodeBase64Unpadded

See: RFC-4648 section 4

Examples:

>>> decodeBase64 $ assertBase64 @'UrlPadded "PDw_Pj4=""<<?>>"

>>> decodeBase64 $ assertBase64 @'UrlUnpadded "PDw_Pj4""<<?>>"

Decode an untyped Base64url-encoded Text value. If its length is not a multiple of 4, then padding chars will be added to fill out the input to a multiple of 4 for safe decoding as base64url encodings are optionally padded.

For a decoder that fails on unpadded input, use decodeBase64Unpadded.

See: RFC-4648 section 4

Examples:

>>> decodeBase64Untyped "PDw_Pj4="Right "<<?>>"

>>> decodeBase64Untyped "PDw_Pj4"Right "<<?>>"

>>> decodeBase64Untyped "PDw-Pg="Left "Base64-encoded bytestring has invalid padding"

>>> decodeBase64Untyped "PDw-Pg"Right "<<>>"

Attempt to decode an untyped lazy ByteString value as Base64url, converting from ByteString to Text according to some encoding function. In practice, This is something like decodeUtf8', which may produce an error.

See: RFC-4648 section 4

Examples:

decodeBase64With decodeUtf8'
  :: ByteString -> Either (Base64Error UnicodeException) Text

Decode an unpadded Base64url encoded Text value.

See: RFC-4648 section 4

Examples:

>>> decodeBase64Unpadded $ assertBase64 @'UrlUnpadded "PDw_Pj4""<<?>>"

Decode an unpadded, untyped Base64url encoded Text value.

See: RFC-4648 section 4

Examples:

>>> decodeBase64UnpaddedUntyped "PDw_Pj4"Right "<<?>>"

>>> decodeBase64UnpaddedUntyped "PDw_Pj4="Left "Base64-encoded bytestring has invalid padding"

Attempt to decode an unpadded, untyped lazy ByteString value as Base64url, converting from ByteString to Text according to some encoding function. In practice, This is something like decodeUtf8', which may produce an error.

See: RFC-4648 section 4

Examples:

decodeBase64UnpaddedUntypedWith decodeUtf8'
  :: ByteString -> Either (Base64Error UnicodeException) Text

Decode a padded Base64url encoded Text value

See: RFC-4648 section 4

Examples:

>>> decodeBase64Padded $ assertBase64 @'UrlPadded "PDw_Pj4=""<<?>>"

Decode an untyped, padded Base64url encoded Text value

See: RFC-4648 section 4

Examples:

>>> decodeBase64PaddedUntyped "PDw_Pj4="Right "<<?>>"

Attempt to decode a padded, untyped lazy ByteString value as Base64url, converting from ByteString to Text according to some encoding function. In practice, This is something like decodeUtf8', which may produce an error.

See: RFC-4648 section 4

Example:

decodeBase64PaddedWith T.decodeUtf8'
  :: ByteString -> Either (Base64Error UnicodeException) Text

Leniently decode an untyped Base64url-encoded Text. This function will not generate parse errors. If input data contains padding chars, then the input will be parsed up until the first pad character.

Note: This is not RFC 4648-compliant.

Examples:

>>> decodeBase64Lenient "PDw_Pj4=""<<?>>"

>>> decodeBase64Lenient "PDw_%%%$}Pj4""<<?>>"

Tell whether an untyped Text value is Base64url-encoded

Examples:

>>> isBase64Url "PDw_Pj4="True

>>> isBase64Url "PDw_Pj4"True

>>> isBase64Url "PDw_Pj"False

Tell whether an untyped Text value is a valid Base64url format.

This will not tell you whether or not this is a correct Base64url representation, only that it conforms to the correct shape. To check whether it is a true Base64 encoded Text value, use isBase64Url.

Examples:

>>> isValidBase64Url "PDw_Pj4="True

>>> isValidBase64Url "PDw_Pj"True

>>> isValidBase64Url "%"False