feat: add semisol.dev recommends api

packages/app/src/External/SemisolDev.ts

@@ -0,0 +1,43 @@
+export interface RecommendedProfilesResponse {
+  quality: number;
+  recommendations: Array<[pubkey: string, score: number]>;
+}
+
+export class SemisolDevApiError extends Error {
+  body: string;
+  statusCode: number;
+
+  constructor(message: string, body: string, status: number) {
+    super(message);
+    this.body = body;
+    this.statusCode = status;
+  }
+}
+
+export default class SemisolDevApi {
+  readonly #url = "https://api.semisol.dev";
+
+  async sugguestedFollows(pubkey: string, follows: Array<string>) {
+    return await this.#json<RecommendedProfilesResponse>("POST", "/nosgraph/v1/recommend", {
+      pubkey,
+      exclude: [],
+      following: follows,
+    });
+  }
+
+  async #json<T>(method: string, path: string, body?: unknown) {
+    const url = `${this.#url}${path}`;
+    const res = await fetch(url, {
+      method: method ?? "GET",
+      body: body ? JSON.stringify(body) : undefined,
+      headers: {
+        ...(body ? { "content-type": "application/json" } : {}),
+      },
+    });
+    if (res.ok) {
+      return (await res.json()) as T;
+    } else {
+      throw new SemisolDevApiError(`Failed to load content from ${url}`, await res.text(), res.status);
+    }
+  }
+}