add preamble and surround latex markdown with begin and end document / multicols

2026-07-22 16:56:57 +00:00 · 2026-05-28 22:00:58 +02:00
parent 26567c1e03
commit c2ab890f11
4 changed files with 885 additions and 2 deletions
@@ -1,4 +1,4 @@
-open Lwt.Syntax
+(* open Lwt.Syntax
 open Yojson.Safe.Util
 open Pgn_logic

@@ -14,9 +14,11 @@ let cors_middleware next_handler request =
  if Dream.method_ request = `OPTIONS then (
    let response = Dream.response "" in
    Dream.add_header response "Access-Control-Allow-Origin" allowed_origin;
-    Dream.add_header response "Access-Control-Allow-Methods" "POST, GET";
+    Dream.add_header response "Access-Control-Allow-Methods"
+      "POST, GET, OPTIONS";
    Dream.add_header response "Access-Control-Allow-Headers"
      "Content-Type, Authorization";
+    Dream.add_header response "Access-Control-Max-Age" "86400";
    Dream.set_status response `No_Content;
    Lwt.return response)
  else
@@ -25,6 +27,35 @@ let cors_middleware next_handler request =
    Lwt.return response

 let handle_convert request =
+  let start_time = Unix.gettimeofday () in
+
+  let temp_id =
+    Int64.to_string (Int64.of_float (Unix.gettimeofday () *. 1000.0))
+  in
+
+  let temp_dir = Filename.get_temp_dir_name () in
+
+  let tex_file_path =
+    Filename.concat temp_dir (Printf.sprintf "game-%s.tex" temp_id)
+  in
+
+  let pdf_file_path =
+    Filename.concat temp_dir (Printf.sprintf "game-%s.pdf" temp_id)
+  in
+
+  let log_file_path =
+    Filename.concat temp_dir (Printf.sprintf "game-%s.log" temp_id)
+  in
+
+  let aux_file_path =
+    Filename.concat temp_dir (Printf.sprintf "game-%s.aux" temp_id)
+  in
+
+  let cleanup () =
+    [ tex_file_path; pdf_file_path; log_file_path; aux_file_path ]
+    |> List.iter (fun path -> if Sys.file_exists path then Sys.remove path)
+  in
+
  let* body = Dream.body request in

  try
@@ -59,6 +90,152 @@ let handle_convert request =
        (Printf.sprintf {|{"type": "error", "message": "%s"}|}
           (Printexc.to_string exn))

+let () =
+  Dream.run ~interface:"0.0.0.0" ~port:8080
+  @@ Dream.logger @@ cors_middleware
+  @@ Dream.router
+       [
+         Dream.get "/" (fun request ->
+             Dream.from_filesystem "static" "doc.html" request);
+         Dream.get "/health" (fun _ -> Dream.respond "OK");
+         Dream.post "/api/v1/pdf" handle_convert;
+         Dream.get "/api/v1" (fun request ->
+             Dream.from_filesystem "static" "doc.html" request);
+         Dream.get "/swagger.json" (fun request ->
+             Dream.from_filesystem "static" "swagger.json" request);
+       ] *)
+
+open Lwt.Syntax
+open Yojson.Safe.Util
+open Pgn_logic
+
+let is_dev_mode () =
+  Array.to_list Sys.argv
+  |> List.exists (fun arg -> arg = "DREAM_ENV=development")
+
+let cors_middleware next_handler request =
+  let allowed_origin =
+    if is_dev_mode () then "*" else "https://chess-scribe.org"
+  in
+
+  if Dream.method_ request = `OPTIONS then (
+    let response = Dream.response "" in
+    Dream.add_header response "Access-Control-Allow-Origin" allowed_origin;
+    Dream.add_header response "Access-Control-Allow-Methods"
+      "POST, GET, OPTIONS";
+    Dream.add_header response "Access-Control-Allow-Headers"
+      "Content-Type, Authorization";
+    Dream.add_header response "Access-Control-Max-Age" "86400";
+    Dream.set_status response `No_Content;
+    Lwt.return response)
+  else
+    let* response = next_handler request in
+    Dream.add_header response "Access-Control-Allow-Origin" allowed_origin;
+    Lwt.return response
+
+let handle_convert request =
+  (* let start_time = Unix.gettimeofday () in *)
+  let temp_id =
+    Int64.to_string (Int64.of_float (Unix.gettimeofday () *. 1000.0))
+  in
+
+  let temp_dir = Filename.get_temp_dir_name () in
+
+  let tex_file_path =
+    Filename.concat temp_dir (Printf.sprintf "game-%s.tex" temp_id)
+  in
+
+  let pdf_file_path =
+    Filename.concat temp_dir (Printf.sprintf "game-%s.pdf" temp_id)
+  in
+
+  let log_file_path =
+    Filename.concat temp_dir (Printf.sprintf "game-%s.log" temp_id)
+  in
+
+  let aux_file_path =
+    Filename.concat temp_dir (Printf.sprintf "game-%s.aux" temp_id)
+  in
+
+  let cleanup () =
+    [ tex_file_path; pdf_file_path; log_file_path; aux_file_path ]
+    |> List.iter (fun path -> if Sys.file_exists path then Sys.remove path)
+  in
+
+  let* body = Dream.body request in
+
+  try
+    let json = Yojson.Safe.from_string body in
+
+    let pgn = json |> member "pgn" |> to_string in
+    let diagram_clock = json |> member "diagramClock" |> to_bool in
+    let diagrams_json = json |> member "diagrams" in
+
+    let diagrams_data =
+      Yojson.Safe.to_string diagrams_json |> Pgn2tex.parse_diagrams_json
+    in
+
+    let game_tex =
+      "\\begin{document}\\begin{multicols}{2}"
+      ^ Pgn2tex.to_tex pgn ~diagram_data:diagrams_data ~clock:diagram_clock
+      ^ "\\end{multicols}\\end{document}"
+    in
+
+    Out_channel.with_open_text tex_file_path (fun oc ->
+        Out_channel.output_string oc game_tex);
+
+    let argv =
+      [|
+        "pdflatex";
+        "-fmt";
+        "./preambles/chess";
+        "-interaction=nonstopmode";
+        Printf.sprintf "-output-directory=%s" temp_dir;
+        tex_file_path;
+      |]
+    in
+
+    let pid =
+      Unix.create_process "pdflatex" argv Unix.stdin Unix.stdout Unix.stderr
+    in
+    (* let _, process_status = Unix.waitpid [] pid in *)
+    let _, _ = Unix.waitpid [] pid in
+
+    if Sys.file_exists pdf_file_path then (
+      let pdf_content =
+        In_channel.with_open_bin pdf_file_path In_channel.input_all
+      in
+
+      cleanup ();
+
+      (* TODO: record_metrics "SUCCESS" start_time; *)
+      Dream.respond ~status:`Created
+        ~headers:
+          [
+            ("Content-Disposition", "inline");
+            ("Content-Type", "application/pdf");
+          ]
+        pdf_content)
+    else failwith "PDF generation failed: output file not found on disk"
+  with
+  | Type_error (msg, _) ->
+      cleanup ();
+      Dream.json ~status:`Bad_Request
+        (Printf.sprintf
+           {|{"type": "error", "message": "JSON structure error: %s"}|} msg)
+  | Yojson.Json_error msg ->
+      cleanup ();
+      Dream.json ~status:`Bad_Request
+        (Printf.sprintf
+           {|{"type": "error", "message": "Invalid JSON syntax: %s"}|} msg)
+  | exn ->
+      cleanup ();
+      let err_msg = Printexc.to_string exn in
+      (* TODO: record_metrics "FAIL" start_time err_msg; *)
+      (* TODO: logger.error err_msg; *)
+      Dream.json ~status:`Internal_Server_Error
+        (Printf.sprintf {|{"type": "error", "message": "%s"}|} err_msg)
+
 let () =
  Dream.run ~interface:"0.0.0.0" ~port:8080
  @@ Dream.logger @@ cors_middleware
@@ -0,0 +1,691 @@
+This is pdfTeX, Version 3.141592653-2.6-1.40.22 (TeX Live 2022/dev/Debian) (preloaded format=pdflatex 2026.2.2)  17 FEB 2026 15:13
+entering extended mode
+ restricted \write18 enabled.
+ %&-line parsing enabled.
+**&pdflatex ./preambles/chess.tex
+(./preambles/chess.tex
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