add multipart/form-data content resolver

Author: omermecitoglu

src/core/form-data.ts

@@ -0,0 +1,6 @@
+import type { Operation } from "./openapi";
+
+export function hasFormData(operation: Operation) {
+  if (!operation.requestBody) return false;
+  return "multipart/form-data" in operation.requestBody.content;
+}

src/core/openapi.ts

@@ -38,7 +38,7 @@ type ResponseContent = {
   schema: SchemaDefinition,
 };
 
-type ContentType = "application/json" | "text/plain";
+type ContentType = "application/json" | "text/plain" | "multipart/form-data";
 
 export type Content = Record<ContentType, ResponseContent>;
 

src/core/resolvers/content.ts

@@ -1,5 +1,8 @@
 import type { Content } from "~/core/openapi";
 
 export default function getContentSchema(content: Content) {
-  return content["application/json"].schema;
+  if ("multipart/form-data" in content) {
+    return content["multipart/form-data"].schema;
+  }
+  return (content["application/json"] as Content["application/json"]).schema;
 }

src/core/resolvers/operation-param.ts

@@ -1,3 +1,4 @@
+import { hasFormData } from "~/core/form-data";
 import type { Operation, OperationParameter } from "~/core/openapi";
 import { resolveSchema } from "~/core/resolvers/schema-definition";
 import getContentSchema from "./content";
@@ -12,6 +13,11 @@ function resolveRequestBody(body: Exclude<Operation["requestBody"], undefined>,
   return `requestBody${body.required ? "" : "?"}: ${resolveSchema(getContentSchema(body.content))}`;
 }
 
+function resolveFormData(body: Exclude<Operation["requestBody"], undefined>, typescript: boolean) {
+  if (!typescript) return "formBody";
+  return `formBody${body.required ? "" : "?"}: ${resolveSchema(getContentSchema(body.content))}`;
+}
+
 function sortRequiredParamsFirst(paramA: OperationParameter, paramB: OperationParameter) {
   if (paramA.required === paramB.required) return 0;
   return paramA.required ? -1 : 1;
@@ -25,6 +31,13 @@ export function resolveOperationParams(operation: Operation, typescript: boolean
   const collection = [
     ...resolvedParams,
   ];
-  if (operation.requestBody) collection.push(resolveRequestBody(operation.requestBody, typescript));
+  if (operation.requestBody) {
+    operation.requestBody.content;
+    if (hasFormData(operation)) {
+      collection.push(resolveFormData(operation.requestBody, typescript));
+    } else {
+      collection.push(resolveRequestBody(operation.requestBody, typescript));
+    }
+  }
   return collection;
 }