Updated wasm code to work with new gateway and updated the example (#219)

* Updated wasm code to work with new gateway and updated the example

* cargo fmt

* Fixed test by ensuring destination is present at a gateway

* Updated hardcoded default port

* ibid. to correct value

Author: jstuczyn

Cargo.lock

@@ -1,8 +1,10 @@
 [package]
-name = "sphinx-wasm"
-version = "0.1.0"
-authors = ["Dave Hrycyszyn <futurechimp@users.noreply.github.com>"]
+name = "nym-client-wasm"
+version = "0.1.2"
+authors = ["Dave Hrycyszyn <futurechimp@users.noreply.github.com>", "Jedrzej Stuczynski <andrew@nymtech.net>"]
 edition = "2018"
+repository = "https://github.com/nymtech/nym"
+license = "Apache-2.0"
 
 [lib]
 crate-type = ["cdylib", "rlib"]
@@ -11,7 +13,6 @@ crate-type = ["cdylib", "rlib"]
 default = ["console_error_panic_hook"]
 
 [dependencies]
-# itertools = "0.8.2"
 log = "0.4"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"

clients/webassembly/Cargo.toml

@@ -14,8 +14,12 @@ See our [docs](https://nymtech.net/docs).
 
 ### Demo
 
-There's a demo web application in the `www` folder. To run it, first make sure you've got a recent `npm` installed, then follow the instructions in its README. 
+There's a demo web application in the `www` folder. To run it, first make sure you've got a recent `npm` installed, then follow the instructions in its README.
 
 ### Developing
 
 Whenever you change your Rust, run `wasm-pack build` to update the built was artefact in the `pkg` directory.
+
+# IMPORTANT!!
+
+You also need to manually copy `helpers.js` file into the `pkg` and add it to `package.json`. I'm 100% sure one of the hundreds JS packagers could do that for us, but I didn't feel like spending 10 hours figuring this one out.

clients/webassembly/README.md

@@ -0,0 +1,44 @@
+import * as wasm from "nym-client-wasm";
+
+export function makeRegisterRequest(address) {
+    return JSON.stringify({ "type": "register", "address": address });
+}
+
+export function makeAuthenticateRequest(address, token) {
+    return JSON.stringify({ "type": "authenticate", "address": address, "token": token });
+}
+
+// NOTE: this currently does not implement chunking and too long messages will cause a panic
+export function makeSendablePacket(topology, message, recipient) {
+    return wasm.create_gateway_sphinx_packet(topology, message, recipient);
+}
+
+export async function getTopology(directoryUrl) {
+    let response = await http('get', directoryUrl);
+    let topology = JSON.parse(response);
+    return topology;
+}
+
+function http(method, url) {
+    return new Promise(function (resolve, reject) {
+        let xhr = new XMLHttpRequest();
+        xhr.open(method, url);
+        xhr.onload = function () {
+            if (this.status >= 200 && this.status < 300) {
+                resolve(xhr.response);
+            } else {
+                reject({
+                    status: this.status,
+                    statusText: xhr.statusText
+                });
+            }
+        };
+        xhr.onerror = function () {
+            reject({
+                status: this.status,
+                statusText: xhr.statusText
+            });
+        };
+        xhr.send();
+    });
+}