doc/design-thoughts/config-language.txt

Prévoir des commandes en plusieurs mots clés.
Par exemple :

  timeout connection XXX
  connection scale XXX

On doit aussi accepter les préfixes :

  tim co XXX
  co sca XXX

Prévoir de ranger les combinaisons dans un tableau. On doit même
pouvoir effectuer un mapping simplifiant le parseur.


Pour les filtres :


    <direction> <where> <what> <operator> <pattern> <action> [ <args>* ]

    <direction> = [ req | rsp ]
    <where>     = [ in | out ]
    <what>      = [ line | LINE | METH | URI | h(hdr) | H(hdr) | c(cookie) | C(cookie) ]
    <operator>  = [ == | =~ | =* | =^ | =/ | != | !~ | !* | !^ | !/ ]
    <pattern>   = "<string>"
    <action>    = [ allow | permit | deny | delete | replace | switch | add | set | redir ]
    <args>      = optionnal action args

    exemples:

        req in URI     =^ "/images" switch images
        req in h(host) =* ".mydomain.com" switch mydomain
        req in h(host) =~ "localhost(.*)" replace "www\1"

    alternative :

    <direction> <where> <action> [not] <what> [<operator> <pattern> [ <args>* ]]

        req in  switch   URI     =^ "/images" images
        req in  switch   h(host) =* ".mydomain.com" mydomain
        req in  replace  h(host) =~ "localhost(.*)" "www\1"
        req in  delete   h(Connection)
        req in  deny not line =~ "((GET|HEAD|POST|OPTIONS) /)|(OPTIONS *)"
        req out set      h(Connection) "close"
        req out add      line "Server: truc"


    <direction> <action> <where> [not] <what> [<operator> <pattern> [ <args>* ]] ';' <action2> <what2>

        req in  switch   URI     =^ "/images/" images ; replace "/"
        req in  switch   h(host) =* ".mydomain.com" mydomain
        req in  replace  h(host) =~ "localhost(.*)" "www\1"
        req in  delete   h(Connection)
        req in  deny not line =~ "((GET|HEAD|POST|OPTIONS) /)|(OPTIONS *)"
        req out set      h(Connection) "close"
        req out add      line == "Server: truc"


Extension avec des ACL :

        req in acl(meth_valid)   METH =~ "(GET|POST|HEAD|OPTIONS)"  
        req in acl(meth_options) METH == "OPTIONS" 
        req in acl(uri_slash)    URI  =^ "/" 
        req in acl(uri_star)     URI  == "*" 

        req in deny acl !(meth_options && uri_star || meth_valid && uri_slash)

Peut-être plus simplement :

        acl meth_valid   METH =~ "(GET|POST|HEAD|OPTIONS)"  
        acl meth_options METH == "OPTIONS" 
        acl uri_slash    URI  =^ "/" 
        acl uri_star     URI  == "*" 

        req in  deny not acl(meth_options uri_star, meth_valid uri_slash)

        req in  switch   URI     =^ "/images/" images ; replace "/"
        req in  switch   h(host) =* ".mydomain.com" mydomain
        req in  replace  h(host) =~ "localhost(.*)" "www\1"
        req in  delete   h(Connection)
        req in  deny not line =~ "((GET|HEAD|POST|OPTIONS) /)|(OPTIONS *)"
        req out set      h(Connection) "close"
        req out add      line == "Server: truc"

Prévoir le cas du "if" pour exécuter plusieurs actions :

        req in  if URI =^ "/images/" then replace "/" ; switch images

Utiliser les noms en majuscules/minuscules pour indiquer si on veut prendre
en compte la casse ou non :

        if uri  =^ "/watch/"       setbe watch   rebase "/watch/" "/"
        if uri  =* ".jpg"          setbe images
        if uri  =~ ".*dll.*"       deny
        if HOST =* ".mydomain.com" setbe mydomain
        etc...

Another solution would be to have a dedicated keyword to URI remapping. It
would both rewrite the URI and optionally switch to another backend.

        uriremap "/watch/"  "/"       watch
        uriremap "/chat/"   "/"       chat
        uriremap "/event/"  "/event/" event

Or better :

        uriremap "/watch/"  watch  "/"
        uriremap "/chat/"   chat   "/"
        uriremap "/event/"  event

For the URI, using a regex is sometimes useful (eg: providing a set of possible prefixes.


Sinon, peut-être que le "switch" peut prendre un paramètre de mapping pour la partie matchée :

        req in  switch   URI     =^ "/images/" images:"/"