From 01949c23f629444f1667ce22e5a3bc0d48c0040f Mon Sep 17 00:00:00 2001
From: Ryan Kavanagh <rak@rak.ac>
Date: Wed, 27 Oct 2021 17:24:55 -0400
Subject: json parsing for the core API endpoints

---
 lib/listenbrainz.atd     | 68 ++++++++++++++++++++++++++++++++++++------------
 lib/listenbrainz_util.ml | 27 +++++++++++++++++--
 2 files changed, 76 insertions(+), 19 deletions(-)

diff --git a/lib/listenbrainz.atd b/lib/listenbrainz.atd
index d45136d..cf4e09a 100644
--- a/lib/listenbrainz.atd
+++ b/lib/listenbrainz.atd
@@ -1,5 +1,7 @@
-type mbid = string
+type mbid = string <ocaml valid="Listenbrainz_util.validate_mbid">
 type isrc = string
+type unixtime = float <json repr="int">
+type tm = unixtime wrap <ocaml module="Unix" t="Unix.tm" wrap="Unix.gmtime" unwrap="Listenbrainz_util.tm_unwrap">
 
 type additional_info = {
   ?artist_mbids : mbid list option;
@@ -29,30 +31,62 @@ type listen_type = [
   | Import <json name="import">
 ]
 
-type listen_payload = {
-  listened_at : int;
-  track_metadata : track_metadata;
+type similar_user = {
+  user_name : string;
+  similarity : float;
 }
 
-type submission = {
-  listen_type : listen_type;
-  payload : listen_payload list;
-} <ocaml valid="Listenbrainz_util.validate_submission">
+type payload_listen = {
+  ?listened_at : tm option;
+  track_metadata : track_metadata;
+}
 
-type response = {
+type payload_listen_count = {
   count : int;
-  user_id : mbid;
-  listens : listen_payload list;
-} <ocaml valid="Listenbrainz_util.validate_response">
+}
 
-type validate_token = {
+type post_submit_listens = {
+  listen_type : listen_type;
+  payload : payload_listen list;
+} <ocaml valid="Listenbrainz_util.validate_post_submit_listens">
+
+type get_validate_token = {
   code : int;
   message : string;
   valid : bool;
-  user: string;
+  ?user: string option;
+} <ocaml valid="Listenbrainz_util.validate_get_validate_token">
+
+type post_delete_listen = {
+  listened_at : tm;
+  recording_msid : mbid;
+}
+
+type get_user_similar_users = similar_user list
+
+type get_user_listen_count = {
+  payload : payload_listen_count;
+}
+
+type get_user_playing_now = {
+  count : int;
+  user_id : mbid;
+  listens : payload_listen list;
+} <ocaml valid="Listenbrainz_util.validate_get_user_playing_now">
+
+type get_user_similar_to = similar_user
+
+type get_user_listens = {
+  count : int;
+  user_id : mbid;
+  listens : payload_listen list;
+} <ocaml valid="Listenbrainz_util.validate_get_user_listens">
+
+type get_latest_import = {
+  musicbrainz_id : mbid;
+  latest_import : tm;
 }
 
-type delete_listen = {
-  listened_at : int;
-  recording_msid : string;
+type post_latest_import = {
+  ts : tm;
 }
diff --git a/lib/listenbrainz_util.ml b/lib/listenbrainz_util.ml
index 35a7af8..5056c09 100644
--- a/lib/listenbrainz_util.ml
+++ b/lib/listenbrainz_util.ml
@@ -1,9 +1,32 @@
 open Listenbrainz_t
 
-let validate_submission s =
+let uuid_v4_re =
+  (* UUIDs are 8-4-4-4-12 hex digits.
+     * The third block of version 4 UUIDS starts with a 4. *)
+  let four_hex = "[0-9a-f][0-9a-f][0-9a-f][0-9a-f]"
+  in Str.regexp_case_fold ("^" ^ four_hex ^ four_hex
+                           ^ "-" ^ four_hex
+                           ^ "-4[0-9a-f][0-9a-f][0-9a-f]"
+                           ^ "-" ^ four_hex
+                           ^ "-" ^ four_hex ^ four_hex ^ four_hex ^ "$")
+let tm_unwrap tm =
+  let (f, _) = Unix.mktime tm in f
+
+let validate_mbid mbid = Str.string_match uuid_v4_re mbid 0
+
+let validate_post_submit_listens s =
   match s.listen_type with
   | `Single -> List.length s.payload = 1
   | _ -> true
 
-let validate_response r =
+let validate_get_validate_token r =
+  r.code = 200 || r.code = 400
+
+let validate_get_user_playing_now r =
+  match r.listens with
+  | [] -> true
+  | [l] -> l.listened_at = None
+  | _ -> false
+
+let validate_get_user_listens r =
   List.length r.listens = r.count
-- 
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