Fix bug when no file name is provided for upload

.changeset/dirty-pillows-vanish.md

@@ -0,0 +1,5 @@
+---
+"@google/generative-ai": patch
+---
+
+Fix a bug that caused file uploads to be named "undefined" if no file name is provided.

packages/main/src/files/file-manager.test.ts

@@ -15,13 +15,14 @@
  * limitations under the License.
  */
 import { expect, use } from "chai";
-import { GoogleAIFileManager } from "./file-manager";
+import { GoogleAIFileManager, getUploadMetadata } from "./file-manager";
 import * as sinonChai from "sinon-chai";
 import * as chaiAsPromised from "chai-as-promised";
 import { restore, stub } from "sinon";
 import * as request from "./request";
 import { FilesTask } from "./constants";
 import { DEFAULT_API_VERSION } from "../requests/request";
+import { FileMetadata } from "./types";
 
 use(sinonChai);
 use(chaiAsPromised);
@@ -254,4 +255,38 @@ describe("GoogleAIFileManager", () => {
       "Invalid fileId",
     );
   });
+
+  describe("getUploadMetadata", () => {
+    it("getUploadMetadata with only mimeType", () => {
+      const uploadMetadata = getUploadMetadata({ mimeType: "image/jpeg" });
+      expect(uploadMetadata.mimeType).to.equal("image/jpeg");
+      expect(uploadMetadata.displayName).be.undefined;
+      expect(uploadMetadata.name).be.undefined;
+    });
+    it("getUploadMetadata with no mimeType", () => {
+      expect(() => getUploadMetadata({} as FileMetadata)).to.throw(
+        "Must provide a mimeType.",
+      );
+    });
+    it("getUploadMetadata with all fields defined", () => {
+      const uploadMetadata = getUploadMetadata({
+        mimeType: "image/jpeg",
+        displayName: "display name",
+        name: "filename",
+      });
+      expect(uploadMetadata.mimeType).to.equal("image/jpeg");
+      expect(uploadMetadata.displayName).to.equal("display name");
+      expect(uploadMetadata.name).to.equal("files/filename");
+    });
+    it("getUploadMetadata with full file path", () => {
+      const uploadMetadata = getUploadMetadata({
+        mimeType: "image/jpeg",
+        displayName: "display name",
+        name: "custom/path/filename",
+      });
+      expect(uploadMetadata.mimeType).to.equal("image/jpeg");
+      expect(uploadMetadata.displayName).to.equal("display name");
+      expect(uploadMetadata.name).to.equal("custom/path/filename");
+    });
+  });
 });

packages/main/src/files/file-manager.ts

@@ -26,7 +26,10 @@ import {
   UploadFileResponse,
 } from "./types";
 import { FilesTask } from "./constants";
-import { GoogleGenerativeAIError } from "../errors";
+import {
+  GoogleGenerativeAIError,
+  GoogleGenerativeAIRequestInputError,
+} from "../errors";
 
 // Internal type, metadata sent in the upload
 export interface UploadMetadata {
@@ -66,13 +69,7 @@ export class GoogleAIFileManager {
       `multipart/related; boundary=${boundary}`,
     );
 
-    const uploadMetadata: FileMetadata = {
-      mimeType: fileMetadata.mimeType,
-      displayName: fileMetadata.displayName,
-      name: fileMetadata.name?.includes("/")
-        ? fileMetadata.name
-        : `files/${fileMetadata.name}`,
-    };
+    const uploadMetadata = getUploadMetadata(fileMetadata);
 
     // Multipart formatting code taken from @firebase/storage
     const metadataString = JSON.stringify({ file: uploadMetadata });
@@ -169,3 +166,20 @@ function generateBoundary(): string {
   }
   return str;
 }
+
+export function getUploadMetadata(inputMetadata: FileMetadata): FileMetadata {
+  if (!inputMetadata.mimeType) {
+    throw new GoogleGenerativeAIRequestInputError("Must provide a mimeType.");
+  }
+  const uploadMetadata: FileMetadata = {
+    mimeType: inputMetadata.mimeType,
+    displayName: inputMetadata.displayName,
+  };
+
+  if (inputMetadata.name) {
+    uploadMetadata.name = inputMetadata.name.includes("/")
+      ? inputMetadata.name
+      : `files/${inputMetadata.name}`;
+  }
+  return uploadMetadata;
+}