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|
module type GEMINI_TRANSACTION =
sig
type request
module T : TlsUtils.TLS_UTILS
module M : MimeType.MIME_TYPE
type mime_type = M.t
type status =
| INPUT
| SUCCESS of mime_type
| SUCCESS_EOCSS
| REDIR_TEMP of string
| REDIR_PERM of string
| TEMP_FAIL
| SERVER_UNAVAILABLE
| CGI_ERROR
| PROXY_ERROR
| SLOW_DOWN of int
| PERM_FAIL
| NOT_FOUND
| GONE
| PROXY_REQ_REFUSED
| BAD_REQ
| CLIENT_CERT_REQUIRED
| TRANSIENT_CERT_REQUESTED
| AUTHORISED_CERT_REQUIRED
| CERT_NOT_ACCEPTED
| FUTURE_CERT_REJECTED
| EXPIRED_CERT_REJECTED
type response = status * string
val make_request : ?authenticator:T.authenticator
-> ?max_redirects:int -> string -> (request, string) Base.Result.t
val update_request : ?authenticator:T.authenticator
-> ?max_redirects:int -> ?url:string
-> request -> (request, string) Base.Result.t
val status_of_string : string -> (status, string) Base.Result.t
val int_of_status : status -> int
val name_of_status : status -> string
val string_of_status : status -> string
val transaction : request -> (response, string) Base.Result.t Lwt.t
val session : request -> (response, string) Base.Result.t Lwt.t
end
module GeminiTransaction (M : MimeType.MIME_TYPE) (T : TlsUtils.TLS_UTILS)
: GEMINI_TRANSACTION with module M = M and module T = T =
struct
module T = T
type request = { url : Uri.t;
authenticator : T.authenticator;
max_redirects : int; }
module M = M
type mime_type = M.t
type status =
| INPUT
| SUCCESS of mime_type
| SUCCESS_EOCSS
| REDIR_TEMP of string
| REDIR_PERM of string
| TEMP_FAIL
| SERVER_UNAVAILABLE
| CGI_ERROR
| PROXY_ERROR
| SLOW_DOWN of int
| PERM_FAIL
| NOT_FOUND
| GONE
| PROXY_REQ_REFUSED
| BAD_REQ
| CLIENT_CERT_REQUIRED
| TRANSIENT_CERT_REQUESTED
| AUTHORISED_CERT_REQUIRED
| CERT_NOT_ACCEPTED
| FUTURE_CERT_REJECTED
| EXPIRED_CERT_REJECTED
type response = status * string
let url_of_string r =
let url = Uri.of_string r in
let open Base.Result.Monad_infix in
(match Uri.scheme url with
| Some "gemini" -> Ok ()
| _ -> Error "We only support gemini") >>= (fun () ->
match Uri.host url with
| Some _ -> Ok ()
| _ -> Error "No host in url?") >>= (fun () ->
match Uri.port url with
| Some _ -> Ok url
| None -> Ok (Uri.with_port url (Some 1965)))
let make_request ?(authenticator=T.null_auth)
?(max_redirects=5) url =
let open Base.Result.Monad_infix in
url_of_string url >>= (fun url ->
Ok { url; authenticator; max_redirects; })
let update_request ?authenticator ?max_redirects ?url req =
let open Base in
let url_result = match url with
| Some url -> url_of_string url
| None -> Ok req.url in
Result.bind url_result ~f:(fun url ->
Ok { authenticator = Option.value authenticator ~default:req.authenticator;
max_redirects = Option.value max_redirects ~default:req.max_redirects;
url; })
let int_of_status = function
| INPUT -> 10
| SUCCESS _ -> 20
| SUCCESS_EOCSS -> 21
| REDIR_TEMP _ -> 30
| REDIR_PERM _ -> 31
| TEMP_FAIL -> 40
| SERVER_UNAVAILABLE -> 41
| CGI_ERROR -> 42
| PROXY_ERROR -> 43
| SLOW_DOWN _ -> 44
| PERM_FAIL -> 50
| NOT_FOUND -> 51
| GONE -> 52
| PROXY_REQ_REFUSED -> 53
| BAD_REQ -> 54
| CLIENT_CERT_REQUIRED -> 60
| TRANSIENT_CERT_REQUESTED -> 61
| AUTHORISED_CERT_REQUIRED -> 62
| CERT_NOT_ACCEPTED -> 63
| FUTURE_CERT_REJECTED -> 64
| EXPIRED_CERT_REJECTED -> 65
let name_of_status = function
| INPUT -> "10 INPUT"
| SUCCESS _ -> "20 SUCCESS"
| SUCCESS_EOCSS -> "21 SUCCESS - END OF CLIENT CERTIFICATE SESSION"
| REDIR_TEMP _ -> "30 REDIRECT - TEMPORARY"
| REDIR_PERM _ -> "31 REDIRECT - PERMANENT"
| TEMP_FAIL -> "40 TEMPORARY FAILURE"
| SERVER_UNAVAILABLE -> "41 SERVER UNAVAILABLE"
| CGI_ERROR -> "42 CGI ERROR"
| PROXY_ERROR -> "43 PROXY ERROR"
| SLOW_DOWN _ -> "44 SLOW DOWN"
| PERM_FAIL -> "50 PERMANENT FAILURE"
| NOT_FOUND -> "51 NOT FOUND"
| GONE -> "52 GONE"
| PROXY_REQ_REFUSED -> "53 PROXY REQUEST REFUSED"
| BAD_REQ -> "59 BAD REQUEST"
| CLIENT_CERT_REQUIRED -> "60 CLIENT CERTIFICATE REQUIRED"
| TRANSIENT_CERT_REQUESTED -> "61 TRANSIENT CERTIFICATE REQUESTED"
| AUTHORISED_CERT_REQUIRED -> "62 AUTHORISED CERTIFICATE REQUIRED"
| CERT_NOT_ACCEPTED -> "63 CERTIFICATE NOT ACCEPTED"
| FUTURE_CERT_REJECTED -> "64 FUTURE CERTIFICATE REJECTED"
| EXPIRED_CERT_REJECTED -> "65 EXPIRED CERTIFICATE REJECTED"
let string_of_status = function
| INPUT -> "10 "
| SUCCESS m -> "20 " ^ (M.to_canonical m)
| SUCCESS_EOCSS -> "21 "
| REDIR_TEMP u -> "30 " ^ u
| REDIR_PERM u -> "31 " ^ u
| TEMP_FAIL -> "40 "
| SERVER_UNAVAILABLE -> "41 "
| CGI_ERROR -> "42 "
| PROXY_ERROR -> "43 "
| SLOW_DOWN n -> "44 " ^ (string_of_int n)
| PERM_FAIL -> "50 "
| NOT_FOUND -> "51 "
| GONE -> "52 "
| PROXY_REQ_REFUSED -> "53 "
| BAD_REQ -> "59 "
| CLIENT_CERT_REQUIRED -> "60 "
| TRANSIENT_CERT_REQUESTED -> "61 "
| AUTHORISED_CERT_REQUIRED -> "62 "
| CERT_NOT_ACCEPTED -> "63 "
| FUTURE_CERT_REJECTED -> "64 "
| EXPIRED_CERT_REJECTED -> "65 "
let status_parser : status Angstrom.t =
let open Angstrom in
let open ParseCommon.ParseCommon in
(string "10 " *> return INPUT)
<|> lift (fun m -> SUCCESS (M.from_string m)) (string "20 " *> take_till_cr)
<|> (string "21 " *> return SUCCESS_EOCSS)
<|> lift (fun u -> REDIR_TEMP u) (string "30 " *> take_till_cr)
<|> lift (fun u -> REDIR_PERM u) (string "31 " *> take_till_cr)
<|> (string "40 " *> return TEMP_FAIL)
<|> (string "41 " *> return SERVER_UNAVAILABLE)
<|> (string "42 " *> return CGI_ERROR)
<|> (string "43 " *> return PROXY_ERROR)
<|> lift (fun n -> SLOW_DOWN (int_of_string n)) (string "44 " *> take_till_cr)
<|> (string "50 " *> return PERM_FAIL)
<|> (string "51 " *> return NOT_FOUND)
<|> (string "52 " *> return GONE)
<|> (string "53 " *> return PROXY_REQ_REFUSED)
<|> (string "59 " *> return BAD_REQ)
<|> (string "60 " *> return CLIENT_CERT_REQUIRED)
<|> (string "61 " *> return TRANSIENT_CERT_REQUESTED)
<|> (string "62 " *> return AUTHORISED_CERT_REQUIRED)
<|> (string "63 " *> return CERT_NOT_ACCEPTED)
<|> (string "64 " *> return FUTURE_CERT_REJECTED)
<|> (string "65 " *> return EXPIRED_CERT_REJECTED)
<|> fail "Invalid status"
<?> "status"
let status_of_string = Angstrom.parse_string ~consume:All status_parser
let transaction r =
let open Angstrom in
let open Angstrom_lwt_unix in
let parser =
lift2 (fun status -> fun r ->
Ok (status, r))
status_parser
(take_while (fun _ -> true) <* end_of_input)
<?> "transaction" in
let host = Base.Option.value_exn (Uri.host r.url)
~message:"URL with no host?" in
let port = Base.Option.value_exn (Uri.port r.url)
~message:"URL with no port?" in
let%lwt authenticator = r.authenticator in
try%lwt
let%lwt (ic, oc) = Tls_lwt.connect_ext
Tls.Config.(client ~peer_name:host ~authenticator
~ciphers:Ciphers.supported ()) (host, port) in
let%lwt () = Lwt_io.write oc (Uri.to_string r.url ^ "\r\n") in
let%lwt (_, parsed) = parse parser ic in
Lwt.return (Result.join parsed)
with | Tls_lwt.Tls_alert alert -> Lwt.return (Error (Tls.Packet.alert_type_to_string alert))
let rec session req =
match%lwt transaction req with
| Ok (SUCCESS m, r) -> Lwt.return (Ok (SUCCESS m, r))
| Ok (REDIR_TEMP url, _)
| Ok (REDIR_PERM url, _) ->
if req.max_redirects > 1 then
match update_request ~url
~max_redirects:(req.max_redirects - 1) req with
| Ok req -> session req
| Error m -> Lwt.return (Error m)
else
Lwt.return (Error "Too many redirects")
| Ok x -> Lwt.return (Ok x)
| Base.Error m -> Lwt.return (Error m)
end
|
