improve input validation for responses api

Author: leafo

openai/responses.lua

@@ -2,13 +2,36 @@ local cjson = require("cjson")
 local types
 types = require("tableshape").types
 local empty = (types["nil"] + types.literal(cjson.null)):describe("nullable")
+local input_content_item = types.one_of({
+  types.partial({
+    type = "input_text",
+    text = types.string
+  }),
+  types.partial({
+    type = "input_image",
+    image_url = types.string
+  }),
+  types.partial({
+    type = "input_file",
+    file_id = types.string
+  }),
+  types.partial({
+    type = "input_file",
+    file_url = types.string
+  }),
+  types.partial({
+    type = "input_file",
+    file_data = types.string,
+    filename = types.string
+  })
+})
 local input_format = types.string + types.array_of(types.partial({
   role = types.one_of({
     "system",
     "user",
     "assistant"
   }),
-  content = types.string
+  content = types.string + types.array_of(input_content_item)
 }))
 local content_item = types.one_of({
   types.partial({

openai/responses.moon

@@ -3,10 +3,19 @@ import types from require "tableshape"
 
 empty = (types.nil + types.literal(cjson.null))\describe "nullable"
 
+-- Schema for validating input content items (text, images, etc.)
+input_content_item = types.one_of {
+  types.partial { type: "input_text", text: types.string }
+  types.partial { type: "input_image", image_url: types.string } -- URL or base64 data URI (e.g. "data:image/jpeg;base64,...")
+  types.partial { type: "input_file", file_id: types.string } -- uploaded file reference
+  types.partial { type: "input_file", file_url: types.string } -- external URL (PDFs)
+  types.partial { type: "input_file", file_data: types.string, filename: types.string } -- base64 encoded
+}
+
 -- Schema for validating input parameter which can be string or array of messages
 input_format = types.string + types.array_of types.partial {
   role: types.one_of {"system", "user", "assistant"}
-  content: types.string
+  content: types.string + types.array_of(input_content_item)
 }
 
 -- Schema for validating response content items