Set the busboy option defParamCharset to utf8.

Fixes #328 .

Author: jaydenseric

changelog.md

@@ -4,6 +4,7 @@
 
 ### Patch
 
+- Support non `latin1` characters in file names by setting the [`busboy`](https://npm.im/busboy) option `defParamCharset` to `utf8`, fixing [#328](https://github.com/jaydenseric/graphql-upload/issues/328).
 - Removed a redundant `@ts-ignore` comment.
 
 ## 16.0.0

processRequest.mjs

@@ -57,6 +57,7 @@ export default function processRequest(
 
     const parser = busboy({
       headers: request.headers,
+      defParamCharset: "utf8",
       limits: {
         fieldSize: maxFieldSize,
         fields: 2, // Only operations and map.

processRequest.test.mjs

@@ -55,7 +55,7 @@ export default (tests) => {
   });
 
   tests.add(
-    "`processRequest` with a single file and default `createReadStream` options.",
+    "`processRequest` with a single file, default `createReadStream` options, file name chars `latin1`.",
     async () => {
       let serverError;
 
@@ -113,6 +113,67 @@ export default (tests) => {
     }
   );
 
+  tests.add(
+    "`processRequest` with a single file, default `createReadStream` options, file name chars non `latin1`.",
+    async () => {
+      const fileName = "你好.txt";
+
+      let serverError;
+
+      const server = createServer(async (request, response) => {
+        try {
+          const operation =
+            /**
+             * @type {{
+             *   variables: {
+             *     file: Upload,
+             *   },
+             * }}
+             */
+            (await processRequest(request, response));
+
+          ok(operation.variables.file instanceof Upload);
+
+          const upload = await operation.variables.file.promise;
+
+          strictEqual(upload.filename, fileName);
+          strictEqual(upload.mimetype, "text/plain");
+          strictEqual(upload.encoding, "7bit");
+
+          const stream = upload.createReadStream();
+
+          ok(stream instanceof ReadStream);
+          strictEqual(stream.readableEncoding, null);
+          strictEqual(stream.readableHighWaterMark, 16384);
+          strictEqual(await streamToString(stream), "a");
+        } catch (error) {
+          serverError = error;
+        } finally {
+          response.end();
+        }
+      });
+
+      const { port, close } = await listen(server);
+
+      try {
+        const body = new FormData();
+
+        body.append(
+          "operations",
+          JSON.stringify({ variables: { file: null } })
+        );
+        body.append("map", JSON.stringify({ 1: ["variables.file"] }));
+        body.append("1", new File(["a"], fileName, { type: "text/plain" }));
+
+        await fetch(`http://localhost:${port}`, { method: "POST", body });
+
+        if (serverError) throw serverError;
+      } finally {
+        close();
+      }
+    }
+  );
+
   tests.add(
     "`processRequest` with a single file and custom `createReadStream` options.",
     async () => {