add Rust middleware

middleware/.gitignore

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+native/target
+native/index.node
+native/artifacts.json
+**/*~
+**/node_modules
+**/.DS_Store

middleware/README.md

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+# middleware
+
+Nuxt Server Middleware

middleware/lib/index.js

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+const { middleware } = require('../native')
+
+export default middleware

middleware/native/Cargo.toml

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+[package]
+name = "middleware"
+version = "0.1.0"
+authors = ["Jonas Galvez <jonasgalvez@gmail.com>"]
+license = "MIT"
+build = "build.rs"
+exclude = ["artifacts.json", "index.node"]
+
+[lib]
+name = "middleware"
+crate-type = ["dylib"]
+
+[build-dependencies]
+neon-build = "0.2.0"
+
+[dependencies]
+neon = "0.2.0"

middleware/native/build.rs

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+extern crate neon_build;
+
+fn main() {
+    neon_build::setup(); // must be called in build.rs
+
+    // add project-specific build logic here...
+}

middleware/native/src/lib.rs

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+#[macro_use]
+extern crate neon;
+
+use neon::prelude::*;
+
+fn middleware(mut ctx: FunctionContext) -> JsResult<JsUndefined> {
+	// If we also need the request object:
+    // let req = ctx.argument::<JsObject>(0)?;
+    let res = ctx.argument::<JsObject>(1)?;
+    let next = ctx.argument::<JsFunction>(2)?;
+
+    // Create a JsString with the Neon helper
+    let message = ctx.string("Hello from Rust");
+    res.set(&mut ctx, "neonMessage", message)?;
+
+    // Empt argument list for next(), must be Vec<Handle>
+    let args: Vec<Handle<JsValue>> = vec![];
+    // Get a null reference with the Neon helper
+    let null = ctx.null();
+    // Call serverMiddleware's next() function
+    next.call(&mut ctx, null, args)?;
+
+    // Must return JsUndefined
+    Ok(ctx.undefined())
+}
+
+// Neon has no support for default exports yet
+register_module!(mut ctx, {
+    ctx.export_function("middleware", middleware)
+});
+

middleware/package.json

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+{
+  "name": "middleware",
+  "version": "0.1.0",
+  "description": "Nuxt Server Middleware",
+  "main": "lib/index.js",
+  "author": "Jonas Galvez <jonasgalvez@gmail.com>",
+  "license": "MIT",
+  "dependencies": {
+    "neon-cli": "^0.2.0"
+  },
+  "scripts": {
+    "install": "neon build"
+  }
+}