"{ Package: 'stx:libbasic2' }"
"{ NameSpace: Smalltalk }"
Base64Coder subclass:#Base64UrlCoder
instanceVariableNames:''
classVariableNames:'Base64UrlMapping Base64UrlReverseMapping'
poolDictionaries:''
category:'System-Storage'
!
!Base64UrlCoder class methodsFor:'documentation'!
documentation
"
A variant of base64 encoding which generates url- and filename save encodings.
Same as Base64 except that instead of plus and slash, minus and underline are generated.
The main entry point API is
Base64UrlCoder encode:aStringOrBytes
and
Base64UrlCoder decode:aString
If the decoder should return a string, use
Base64UrlCoder decodeAsString:aString.
[author:]
Claus Gittinger
[see also:]
RFC https://tools.ietf.org/html/rfc4648
[instance variables:]
[class variables:]
Base64UrlMapping String Mapping from bytes (with 6 valid bits)
to Base64Url characters
Base64UrlReverseMapping Array Mapping from Base64Url characters to 6-bit-Bytes
"
!
examples
"
[exBegin]
(Base64Coder encode:#[0 0 16r3F]) = 'AAA/'
[exEnd]
[exBegin]
(Base64Coder decode:'AAA/') = #[0 0 63]
[exEnd]
[exBegin]
(Base64UrlCoder encode:#[0 0 16r3F]) = 'AAA_'
[exEnd]
[exBegin]
(Base64UrlCoder decode:'AAA_') = #[0 0 63]
[exEnd]
"
! !
!Base64UrlCoder class methodsFor:'initialization'!
initializeMappings
"initialize class variables"
Base64UrlMapping isNil ifTrue:[
"65 characters representing the 6-bit values from 0-63 and one pad character"
"/ notice: minus and underline instead of plus and slash
Base64UrlMapping := 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_='.
Base64UrlReverseMapping := self reverseMappingFor:Base64UrlMapping.
].
"
Base64UrlMapping := nil.
self initializeMappings
"
"Created: / 30-09-2018 / 15:20:47 / Claus Gittinger"
!
mapping
^ Base64UrlMapping
"Created: / 30-09-2018 / 15:31:14 / Claus Gittinger"
!
reverseMapping
^ Base64UrlReverseMapping
"Created: / 30-09-2018 / 15:31:21 / Claus Gittinger"
! !
!Base64UrlCoder class methodsFor:'documentation'!
version_CVS
^ '$Header$'
! !