feat: add rest support

adapters/http.ts

@@ -1,16 +1,17 @@
-import type { RelayAdapter, RelayRequestInput, RelayResponse } from "../libraries/adapter.ts";
+import type { RelayAdapter, RelayRESTInput } from "../libraries/adapter.ts";
 import { RelayError, UnprocessableContentError } from "../libraries/errors.ts";
+import { RelayProcedureInput, RelayProcedureResponse } from "../mod.ts";
 
 export class HttpAdapter implements RelayAdapter {
   #id: number = 0;
 
   constructor(readonly url: string) {}
 
-  async send({ method, params }: RelayRequestInput): Promise<RelayResponse> {
+  async send({ method, params }: RelayProcedureInput): Promise<RelayProcedureResponse> {
     const id = this.#id++;
     const res = await fetch(this.url, {
       method: "POST",
-      headers: { "content-type": "application/json" },
+      headers: { "x-relay-type": "rpc", "content-type": "application/json" },
       body: JSON.stringify({ relay: "1.0", method, params, id }),
     });
     const contentType = res.headers.get("content-type");
@@ -31,4 +32,20 @@ export class HttpAdapter implements RelayAdapter {
     }
     return json;
   }
+
+  async fetch({ method, url, query, body }: RelayRESTInput) {
+    const res = await fetch(`${url}${query}`, {
+      method,
+      headers: { "x-relay-type": "rest", "content-type": "application/json" },
+      body,
+    });
+    const data = await res.text();
+    if (res.status >= 400) {
+      throw new Error(data);
+    }
+    if (res.headers.get("content-type")?.includes("json")) {
+      return JSON.parse(data);
+    }
+    return data;
+  }
 }