Add opt-in --fetch path for mwebd.exe Windows build

Author: danrmiller

scripts/app_config/configure_stack_wallet.sh

@@ -53,7 +53,11 @@ dart "${APP_PROJECT_ROOT_DIR}/tool/gen_interfaces.dart" \
 
 MWEBD_EXE_SHA256=""
 if  [[ "$1" == "windows" ]]; then
-  dart "${APP_PROJECT_ROOT_DIR}/tool/build_standalone_mwebd_windows.dart"
+  if [[ "${MWEBD_FETCH:-0}" == "1" ]]; then
+    dart "${APP_PROJECT_ROOT_DIR}/tool/build_standalone_mwebd_windows.dart" --fetch
+  else
+    dart "${APP_PROJECT_ROOT_DIR}/tool/build_standalone_mwebd_windows.dart"
+  fi
   MWEBD_EXE_SHA256="$(sha256sum "${APP_PROJECT_ROOT_DIR}/assets/windows/mwebd.exe" | awk '{print $1}')"
   dart "${APP_PROJECT_ROOT_DIR}/tool/process_pubspec_deps.dart" \
         "${PUBSPEC_FILE}" MWEBDEXE

tool/build_standalone_mwebd_windows.dart

@@ -1,8 +1,68 @@
 import 'dart:io';
 
-Future<void> main() async {
+const _mwebdVersion = "v0.1.8";
+const _defaultFetchBaseUrl =
+    "https://github.com/cypherstack/stack_wallet/releases/download";
+
+Future<void> main(List<String> args) async {
   final projectToolDir = File(Platform.script.toFilePath()).parent;
 
+  if (args.contains("--fetch")) {
+    await _fetchPrebuilt(projectToolDir);
+  } else {
+    await _buildFromSource(projectToolDir);
+  }
+}
+
+Future<void> _fetchPrebuilt(Directory projectToolDir) async {
+  final baseUrl =
+      Platform.environment["MWEBD_FETCH_BASE_URL"] ?? _defaultFetchBaseUrl;
+  final tag = "mwebd-$_mwebdVersion";
+
+  final winAssetsDir = Directory(
+    "${projectToolDir.parent.path}"
+    "${Platform.pathSeparator}assets"
+    "${Platform.pathSeparator}windows",
+  );
+  if (!(await winAssetsDir.exists())) {
+    await winAssetsDir.create(recursive: true);
+  }
+  final exePath = "${winAssetsDir.path}${Platform.pathSeparator}mwebd.exe";
+  final shaPath = "$exePath.sha256";
+
+  await _waitForProcess(
+    await Process.start(
+      "curl",
+      ["-fL", "-o", exePath, "$baseUrl/$tag/mwebd.exe"],
+      runInShell: true,
+      mode: ProcessStartMode.inheritStdio,
+    ),
+  );
+  await _waitForProcess(
+    await Process.start(
+      "curl",
+      ["-fL", "-o", shaPath, "$baseUrl/$tag/mwebd.exe.sha256"],
+      runInShell: true,
+      mode: ProcessStartMode.inheritStdio,
+    ),
+  );
+
+  final expected = (await File(
+    shaPath,
+  ).readAsString()).trim().split(RegExp(r"\s+")).first;
+  final actual = (await Process.run("sha256sum", [
+    exePath,
+  ], runInShell: true)).stdout.toString().trim().split(RegExp(r"\s+")).first;
+  if (expected.toLowerCase() != actual.toLowerCase()) {
+    stderr.writeln(
+      "mwebd.exe sha256 mismatch: expected $expected, got $actual",
+    );
+    exit(1);
+  }
+  await File(shaPath).delete();
+}
+
+Future<void> _buildFromSource(Directory projectToolDir) async {
   // setup temp build dir
   final tempBuildDir = Directory(
     "${projectToolDir.path}"
@@ -15,12 +75,17 @@ Future<void> main() async {
 
   // change working dir and clone mwebd
   Directory.current = tempBuildDir;
-  final clone = await Process.start("git", [
-    "clone",
-    "https://www.github.com/ltcmweb/mwebd.git",
-    "--branch",
-    "v0.1.8",
-  ], runInShell: true, mode: ProcessStartMode.inheritStdio);
+  final clone = await Process.start(
+    "git",
+    [
+      "clone",
+      "https://www.github.com/ltcmweb/mwebd.git",
+      "--branch",
+      _mwebdVersion,
+    ],
+    runInShell: true,
+    mode: ProcessStartMode.inheritStdio,
+  );
   await _waitForProcess(clone);
 
   // change working dir and build mwebd.exe
@@ -33,23 +98,40 @@ Future<void> main() async {
   if (Platform.isWindows && isCI) {
     build = await Process.start(
       "go",
-      ["build", "-v", "-o", "../mwebd.exe", "github.com/ltcmweb/mwebd/cmd/mwebd"],
+      [
+        "build",
+        "-v",
+        "-o",
+        "../mwebd.exe",
+        "github.com/ltcmweb/mwebd/cmd/mwebd",
+      ],
       environment: {"CGO_ENABLED": "1"},
       runInShell: true,
       mode: ProcessStartMode.inheritStdio,
     );
   } else if (Platform.isWindows) {
-    build = await Process.start("wsl", [
-      "bash",
-      "-l",
-      "-c",
-      "GOOS=windows GOARCH=amd64 CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc "
-          "go build -v -o ../mwebd.exe github.com/ltcmweb/mwebd/cmd/mwebd",
-    ], runInShell: true, mode: ProcessStartMode.inheritStdio);
+    build = await Process.start(
+      "wsl",
+      [
+        "bash",
+        "-l",
+        "-c",
+        "GOOS=windows GOARCH=amd64 CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc "
+            "go build -v -o ../mwebd.exe github.com/ltcmweb/mwebd/cmd/mwebd",
+      ],
+      runInShell: true,
+      mode: ProcessStartMode.inheritStdio,
+    );
   } else {
     build = await Process.start(
       "go",
-      ["build", "-v", "-o", "../mwebd.exe", "github.com/ltcmweb/mwebd/cmd/mwebd"],
+      [
+        "build",
+        "-v",
+        "-o",
+        "../mwebd.exe",
+        "github.com/ltcmweb/mwebd/cmd/mwebd",
+      ],
       environment: {
         "GOOS": "windows",
         "GOARCH": "amd64",