feat: add optional overwrite param to upload methods

adds new overwrite param to function signatures uploadFile and uploadMultipleFiles

src/methods/upload-file.ts

@@ -10,11 +10,13 @@ import nacl from "tweetnacl";
  *
  * @param {web3.PublicKey} key - Publickey of Storage Account.
  * @param {File | ShadowFile} data - File or ShadowFile object, file extensions should be included in the name property of ShadowFiles.
+ * @param {Boolean} overwrite - If true, overwrites if existing. Default is false.
  * @returns {ShadowUploadResponse} File location and transaction signature.
  */
 export default async function uploadFile(
   key: web3.PublicKey,
-  data: File | ShadowFile
+  data: File | ShadowFile,
+  overwrite: Boolean = false
 ): Promise<ShadowUploadResponse> {
   let fileErrors = [];
   let fileBuffer: Buffer;
@@ -82,6 +84,9 @@ export default async function uploadFile(
     form.append("message", encodedMsg);
     form.append("storage_account", key.toString());
     form.append("signer", this.wallet.publicKey.toString());
+    if(overwrite) {
+      form.append("overwrite", "true");
+    }
   } catch (e) {
     return Promise.reject(new Error(e.message));
   }

src/methods/upload-multiple-files.ts

@@ -22,6 +22,7 @@ interface FileData {
  * @param {web3.PublicKey} key - Storage account PublicKey to upload the files to.
  * @param {FileList | ShadowFile[]} data[] - Array of Files or ShadowFile objects to be uploaded
  * @param {Number} concurrent - Number of files to concurrently upload. Default: 3
+ * @param {Boolean} overwrite - If true, overwrites if existing. Default is false.
  * @param {Function} callback - Callback function for every batch of files uploaded. A number will be passed into the callback like `callback(num)` indicating the number of files that were confirmed in that specific batch.
  * @returns {ShadowBatchUploadResponse[]} - File names, locations and transaction signatures for uploaded files.
  */
@@ -30,7 +31,8 @@ export default async function uploadMultipleFiles(
   key: web3.PublicKey,
   data: FileList | ShadowFile[],
   concurrent = 3,
-  callback?: Function
+  overwrite: Boolean = false,
+  callback?: Function,
 ): Promise<ShadowBatchUploadResponse[]> {
   let fileData: Array<FileData> = [];
   const fileErrors: Array<object> = [];
@@ -218,6 +220,9 @@ export default async function uploadMultipleFiles(
               fd.append("storage_account", key.toString());
               fd.append("signer", this.wallet.publicKey.toString());
               fd.append("fileNames", allFileNames.toString());
+              if (overwrite) {
+                fd.append("overwrite", "true");
+              }
               const controller = new AbortController();
               const timeoutId = setTimeout(() => controller.abort(), 7200000);
               const response = await fetch(`${SHDW_DRIVE_ENDPOINT}/upload`, {