1 files changed, 120 insertions, 0 deletions
diff --git a/src/crypto/browserWorkerEntry.ts b/src/crypto/browserWorkerEntry.ts
new file mode 100644
index 000000000..3df59fe0d
--- /dev/null
+++ b/src/crypto/browserWorkerEntry.ts
@@ -0,0 +1,120 @@
+/*
+ This file is part of TALER
+ (C) 2016 GNUnet e.V.
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Web worker for crypto operations.
+ */
+
+/**
+ * Imports.
+ */
+
+import { CryptoImplementation } from "./cryptoImplementation";
+import { EmscEnvironment } from "./emscInterface";
+
+const worker: Worker = (self as any) as Worker;
+
+class BrowserEmscriptenLoader {
+  private cachedEmscEnvironment: EmscEnvironment | undefined = undefined;
+  private cachedEmscEnvironmentPromise:
+    | Promise<EmscEnvironment>
+    | undefined = undefined;
+
+  async getEmscriptenEnvironment(): Promise<EmscEnvironment> {
+
+    if (this.cachedEmscEnvironment) {
+      return this.cachedEmscEnvironment;
+    }
+
+    if (this.cachedEmscEnvironmentPromise) {
+      return this.cachedEmscEnvironmentPromise;
+    }
+
+    console.log("loading emscripten lib with 'importScripts'");
+    // @ts-ignore
+    self.TalerEmscriptenLib = {};
+    // @ts-ignore
+    importScripts('/emscripten/taler-emscripten-lib.js')
+    // @ts-ignore
+    if (!self.TalerEmscriptenLib) {
+      throw Error("can't import taler emscripten lib");
+    }
+    const locateFile = (path: string, scriptDir: string) => {
+      console.log("locating file", "path", path, "scriptDir", scriptDir);
+      // This is quite hacky and assumes that our scriptDir is dist/
+      return scriptDir + "../emscripten/" + path;
+    };
+    console.log("instantiating TalerEmscriptenLib");
+    // @ts-ignore
+    const lib = self.TalerEmscriptenLib({ locateFile });
+    return new Promise((resolve, reject) => {
+      lib.then((mod: any) => {
+        this.cachedEmscEnvironmentPromise = undefined;
+        const emsc = new EmscEnvironment(mod);
+        this.cachedEmscEnvironment = new EmscEnvironment(mod);
+        console.log("emscripten module fully loaded");
+        resolve(emsc);
+      });
+    });
+  }
+}
+
+let loader = new BrowserEmscriptenLoader();
+
+async function handleRequest(operation: string, id: number, args: string[]) {
+  let emsc = await loader.getEmscriptenEnvironment();
+
+  const impl = new CryptoImplementation(emsc);
+
+  if (!(operation in impl)) {
+    console.error(`crypto operation '${operation}' not found`);
+    return;
+  }
+
+  try {
+    const result = (impl as any)[operation](...args);
+    worker.postMessage({ result, id });
+  } catch (e) {
+    console.log("error during operation", e);
+    return;
+  }
+}
+
+worker.onmessage = (msg: MessageEvent) => {
+  const args = msg.data.args;
+  if (!Array.isArray(args)) {
+    console.error("args must be array");
+    return;
+  }
+  const id = msg.data.id;
+  if (typeof id !== "number") {
+    console.error("RPC id must be number");
+    return;
+  }
+  const operation = msg.data.operation;
+  if (typeof operation !== "string") {
+    console.error("RPC operation must be string");
+    return;
+  }
+
+  if (CryptoImplementation.enableTracing) {
+    console.log("onmessage with", operation);
+  }
+
+  handleRequest(operation, id, args).catch((e) => {
+    console.error("error in browsere worker", e);
+  });
+};