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ocsigen upload two files with dynamic name

The goal

I want to upload two files, and put the IP address of the uploader in the filename

The solution

 open Lwt open XHTML.M open Eliom_services open Eliom_parameters open Eliom_sessions open Eliom_predefmod.Xhtml  let upload = Eliom_services.new_service   ~path:[""]   ~get_params:unit ();;  let upload2 = register_new_post_service   ~fallback:upload   ~post_params:((file "file_horizontal")**(file "file_vertical"))   (fun sp () (f_h,f_v) ->      let to_display =        let name_h = ("/tmp/t_f_h-"^(Unix.string_of_inet_addr (Eliom_sessions.get_remote_inet_addr sp)))         and name_v = ("/tmp/t_f_v-"^(Unix.string_of_inet_addr (Eliom_sessions.get_remote_inet_addr sp)))         in          (try  Unix.unlink name_h           with _ -> ()); Unix.link (Eliom_sessions.get_tmp_filename f_h) name_h;          (try  Unix.unlink name_v           with _ -> ()); Unix.link (Eliom_sessions.get_tmp_filename f_v) name_v;          (name_h^" et aussi "^name_v);      in        Lwt.return          (html             (head (title (pcdata "Upload")) [])             (body [h1 [pcdata to_display]])));;   let uploadform =    register upload     (fun sp () () ->        let f =          (post_form upload2 sp             (fun (file_horizontal, file_vertical) ->                [p [file_input ~name:file_horizontal ();                    br ();                    file_input ~name:file_vertical ();                    br ();                    string_input ~input_type:`Submit ~value:"Send" ()]]             ) ())         in          Lwt.return            (html               (head (title (pcdata "form")) [])               (body [f])));;  

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