refactor(tlon): centralize Urbit request helpers

extensions/tlon/src/urbit/errors.ts

@@ -0,0 +1,51 @@
+export type UrbitErrorCode =
+  | "invalid_url"
+  | "http_error"
+  | "auth_failed"
+  | "missing_cookie"
+  | "channel_not_open";
+
+export class UrbitError extends Error {
+  readonly code: UrbitErrorCode;
+
+  constructor(code: UrbitErrorCode, message: string, options?: { cause?: unknown }) {
+    super(message, options);
+    this.name = "UrbitError";
+    this.code = code;
+  }
+}
+
+export class UrbitUrlError extends UrbitError {
+  constructor(message: string, options?: { cause?: unknown }) {
+    super("invalid_url", message, options);
+    this.name = "UrbitUrlError";
+  }
+}
+
+export class UrbitHttpError extends UrbitError {
+  readonly status: number;
+  readonly operation: string;
+  readonly bodyText?: string;
+
+  constructor(params: { operation: string; status: number; bodyText?: string; cause?: unknown }) {
+    const suffix = params.bodyText ? ` - ${params.bodyText}` : "";
+    super("http_error", `${params.operation} failed: ${params.status}${suffix}`, {
+      cause: params.cause,
+    });
+    this.name = "UrbitHttpError";
+    this.status = params.status;
+    this.operation = params.operation;
+    this.bodyText = params.bodyText;
+  }
+}
+
+export class UrbitAuthError extends UrbitError {
+  constructor(
+    code: "auth_failed" | "missing_cookie",
+    message: string,
+    options?: { cause?: unknown },
+  ) {
+    super(code, message, options);
+    this.name = "UrbitAuthError";
+  }
+}