Code in an expert programming language

Provided for your pleasure, anonymously, from an Expert Programming Language. Scala fans, you're about 2 steps removed from this.

redacted: {[str]
   map: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
   pad: #str _ss "="
   var1: 2 _vs/: map?/:str@&64>map?/:str
   var1[-1+#var1]: 6#(*|var1),6#0
   var1: ,/(-6#/:(6#0),/:var1),(pad*6)#0
   : _ci 2 _sv/: -1 8#((#var1) - pad * 8)#var1
}

Bonus prizes if:

• You can recognize the hideous abomination of a language
• You can figure out the common algorithm it's doing. Hint: What should redacted be named?