feat: deno ffi bindings (#40)

* initial ts commit
* monero.ts improvements
* test on latest, build on debian:bookworm
* feat: upstream changes to bindings
* chore: update checksums
* feat: allow manually loading dylib
* chore: add readme
* fix: free strings after being read to prevent potential memory leaks
* fix: load dylib
* fix: checksum checks segfaulting because of freeing const variables

---------

Co-authored-by: Mateusz Franik <47059999+Im-Beast@users.noreply.github.com>
Co-authored-by: Im-Beast <franik.mateusz@gmail.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/impls/monero.ts/checksum.ts b/impls/monero.ts/checksum.ts
new file mode 100644
index 0000000..22d3038
--- /dev/null
+++ b/impls/monero.ts/checksum.ts
@@ -0,0 +1,65 @@
+import { moneroChecksum } from "./checksum_monero.ts";
+import { readCString } from "./src/utils.ts";
+import { dylib, loadDylib } from "./src/bindings.ts";
+
+loadDylib();
+
+export class ChecksumError extends Error {
+  readonly code: number;
+  readonly errors: string[];
+
+  constructor(code: number, errors: string[]) {
+    super("MoneroC binding checksum failed:\n" + errors.join("\n"));
+    this.code = code;
+    this.errors = errors;
+  }
+}
+
+/**
+ * Validates MoneroC checksums
+ * @returns {null} if checksums are correct
+ * @returns {ChecksumError} which contains information about why checksum failed
+ */
+export async function validateChecksum(): Promise<ChecksumError | null> {
+  const cppHeaderHash = await readCString(await dylib.symbols.MONERO_checksum_wallet2_api_c_h(), false);
+  const tsHeaderHash = moneroChecksum.wallet2_api_c_h_sha256;
+
+  const errors: string[] = [];
+
+  let errorCode = 0;
+  if (cppHeaderHash !== tsHeaderHash) {
+    errors.push("ERR: Header file check mismatch");
+    errorCode++;
+  }
+
+  const cppSourceHash = await readCString(await dylib.symbols.MONERO_checksum_wallet2_api_c_cpp(), false);
+  const tsSourceHash = moneroChecksum.wallet2_api_c_cpp_sha256;
+  if (cppSourceHash !== tsSourceHash) {
+    errors.push(`ERR: CPP source file check mismatch ${cppSourceHash} == ${tsSourceHash}`);
+    errorCode++;
+  }
+
+  const cppExportHash = await readCString(await dylib.symbols.MONERO_checksum_wallet2_api_c_exp(), false);
+  const tsExportHash = moneroChecksum.wallet2_api_c_exp_sha256;
+  if (cppExportHash !== tsExportHash) {
+    if (Deno.build.os !== "darwin") {
+      errors.push("WARN: EXP source file check mismatch");
+    } else {
+      errors.push(`ERR: EXP source file check mismatch ${cppExportHash} == ${tsExportHash}`);
+    }
+    errorCode++;
+  }
+
+  if (errorCode) {
+    return new ChecksumError(errorCode, errors);
+  }
+
+  return null;
+}
+
+if (import.meta.main) {
+  const maybeError = await validateChecksum();
+  if (maybeError) {
+    throw maybeError;
+  }
+}