This is a really great joke:
> http://left-pad.io/ <http://left-pad.io/>
But should you feel the need to implement this extremely valuable web service yourself, here is how you could do it in Pharo (error handling is not 100% bullet proof, this is just a quick demo, but you get the idea):
'paddin'' oswalt' padLeftTo: 68 with: $@.
(ZnServer startDefaultOn: 8080)
�� ��onRequestRespond: [ :req |
�� �� ��| str len ch |
�� �� ��str := req uri queryAt: #str ifAbsent: [ '' ].
�� �� ��len := req uri queryAt: #len ifAbsent: [ '' ].
�� �� ��len := Integer readFrom: len ifFail: [ 0 ].
�� �� ��ch := (req uri queryAt: #ch ifAbsent: [ ' ' ]) first.
�� �� ��ZnResponse ok: (ZnEntity text: (str padLeftTo: len with: ch)) ].
ZnClient new
�� host: #localhost;
�� port: 8080;
�� queryAt: #str put: 'paddin'' oswalt';
�� queryAt: #len put: 68;
�� queryAt: #ch put: $@;
�� get.
$ curl 'http://localhost:8080/?str=paddin%27%20oswalt&len=68&ch=@'
Of course, if you are really going this into production, you'll have to pay me and Pharo the necessary royalties ;-)
Sven
PS: Returning a JSON (which does not really make sense here) is left as an exercise.