Read only client

README.md

@@ -28,6 +28,7 @@ make components
 ### Components
 
 - [`http-client`](./components/http-client/)
+- [`readonly`](./components/readonly/)
 
 ## Community
 

components/http-client/README.md

@@ -20,4 +20,4 @@ A higher-level HTTP client that delegates to wasi:http/client.
 ## The `http-client` World
 
 - exports `componentized:http/client`
-- imports `wasi:http/client@0.3.1`
+- imports `wasi:http/client@0.3`

components/readonly/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "readonly"
+version = "0.1.0"
+edition = "2024"
+license = "Apache-2.0"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+wit-bindgen = { workspace = true, features = ["async-spawn"] }

components/readonly/README.md

@@ -0,0 +1,8 @@
+# `readonly`
+
+Restricts http methods to `get`, `head`, `query` and `options`, otherwise returns `http-request-method-invalid` error code.
+
+## The `readonly` World
+
+- exports `wasi:http/client@0.3`
+- imports `wasi:http/client@0.3`

components/readonly/src/lib.rs

@@ -0,0 +1,49 @@
+#![no_std]
+
+use crate::{
+    exports::wasi::http::client::{ErrorCode, Guest, Request, Response},
+    wasi::http::{client, types::Method},
+};
+
+struct ReadOnlyClient;
+
+impl ReadOnlyClient {
+    fn allowed_method(method: Method) -> bool {
+        let method = match method {
+            Method::Get => "get",
+            Method::Head => "head",
+            Method::Post => "post",
+            Method::Put => "put",
+            Method::Delete => "delete",
+            Method::Connect => "connect",
+            Method::Options => "options",
+            Method::Trace => "trace",
+            Method::Patch => "patch",
+            Method::Other(method) => &method.to_lowercase(),
+        };
+        match method {
+            "get" | "head" | "query" | "options" => true,
+            _ => false,
+        }
+    }
+}
+
+impl Guest for ReadOnlyClient {
+    #[doc = "/ This function may be used to either send an outgoing request over the"]
+    #[doc = "/ network or to forward it to another component."]
+    #[allow(async_fn_in_trait)]
+    async fn send(request: Request) -> Result<Response, ErrorCode> {
+        match Self::allowed_method(request.get_method()) {
+            true => client::send(request).await,
+            false => Err(ErrorCode::HttpRequestMethodInvalid),
+        }
+    }
+}
+
+export!(ReadOnlyClient);
+
+wit_bindgen::generate!({
+    path: "../wit",
+    world: "client",
+    generate_all,
+});

components/wit/worlds.wit

@@ -4,3 +4,8 @@ world http-client {
     import wasi:http/client@0.3.0;
     export componentized:http/client@0.1.0-dev;
 }
+
+world client {
+    import wasi:http/client@0.3.0;
+    export wasi:http/client@0.3.0;
+}