remove WebAssembly for wasm parsing in favor of manual parsing

CHANGELOG.md

@@ -11,6 +11,8 @@ A breaking change will get clearly marked in this log.
 * `rpc.Api.BalanceResponse` now can include a `revocable` field in its `balanceEntry` for when trustlines are fetched ([#1286](https://github.com/stellar/js-stellar-sdk/pull/1286/)).
 * Added Timepoint and Duration support to `Spec` ([#1288](https://github.com/stellar/js-stellar-sdk/pull/1288))
 
+### Fixed
+* Remove `WebAssembly` usage in favor of manual wasm parsing ([#1300](https://github.com/stellar/js-stellar-sdk/pull/1300)).
 
 ## [v14.3.3](https://github.com/stellar/js-stellar-sdk/compare/v14.3.2...v14.3.3)
 

src/contract/spec.ts

@@ -500,8 +500,8 @@ export class Spec {
    * @returns {Promise<module:contract.Spec>} A Promise that resolves to a Spec instance.
    * @throws {Error} If the contract spec cannot be obtained from the provided wasm binary.
    */
-  static async fromWasm(wasm: Buffer): Promise<Spec> {
-    const spec = await specFromWasm(wasm);
+  static fromWasm(wasm: Buffer): Spec {
+    const spec = specFromWasm(wasm);
     return new Spec(spec);
   }
 

src/contract/wasm_spec_parser.ts

@@ -5,19 +5,9 @@ import { parseWasmCustomSections } from "./utils";
  * @returns The XDR buffer representing the contract spec.
  * @throws {Error} If the contract spec cannot be obtained from the provided wasm binary.
  */
-export async function specFromWasm(wasm: Buffer) {
-  let xdrSections: ArrayBuffer[] | undefined;
-
-  try {
-    const wasmModule = await WebAssembly.compile(wasm);
-    xdrSections = WebAssembly.Module.customSections(
-      wasmModule,
-      "contractspecv0",
-    );
-  } catch {
-    const customData = parseWasmCustomSections(wasm);
-    xdrSections = customData.get("contractspecv0");
-  }
+export function specFromWasm(wasm: Buffer) {
+  const customData = parseWasmCustomSections(wasm);
+  let xdrSections = customData.get("contractspecv0");
 
   if (!xdrSections || xdrSections.length === 0) {
     throw new Error("Could not obtain contract spec from wasm");

src/horizon/server.ts

@@ -333,10 +333,14 @@ export class HorizonServer {
     );
 
     return this.httpClient
-      .post(this.serverURL.clone().segment("transactions").toString(), `tx=${tx}`, {
-        timeout: SUBMIT_TRANSACTION_TIMEOUT,
-        headers: { "Content-Type": "application/x-www-form-urlencoded" },
-      })
+      .post(
+        this.serverURL.clone().segment("transactions").toString(),
+        `tx=${tx}`,
+        {
+          timeout: SUBMIT_TRANSACTION_TIMEOUT,
+          headers: { "Content-Type": "application/x-www-form-urlencoded" },
+        },
+      )
       .then((response) => {
         if (!response.data.result_xdr) {
           return response.data;