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open Unix
open Lwt
open Cohttp
open Cohttp_lwt_unix
let session_file = ".session"
let year_file = ".year"
let get_token () =
let file = In_channel.open_text session_file in
let token = In_channel.input_all file in
In_channel.close file ; String.trim token
let get_year () =
if Caml.Sys.file_exists year_file then (
let file = In_channel.open_text year_file in
let year = In_channel.input_all file in
In_channel.close file ;
int_of_string (String.trim year) )
else
let time = time () in
let time = gmtime time in
time.tm_year + 1900
let download_input day fn =
let year = get_year () in
let url =
Printf.sprintf "https://adventofcode.com/%d/day/%s/input" year day
in
let token = get_token () in
let headers = Header.init () in
let headers = Header.add headers "Cookie" ("session=" ^ token) in
let headers =
Header.add headers "User-Agent"
"github.com/fangyi-zhou/advent-of-code-ocaml-starter by \
me+aoc@fangyi.io"
in
let uri = Uri.of_string url in
let body =
Client.get ~headers uri
>>= fun (resp, body) ->
let code = resp |> Response.status |> Code.code_of_status in
if code = 200 then body |> Cohttp_lwt.Body.to_string
else failwith ("Unable to get data, status " ^ Int.to_string code)
in
let body = Lwt_main.run body in
let body = String.trim body in
let file = Out_channel.open_text fn in
Out_channel.output_string file body ;
Out_channel.close file
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