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import { hc, type InferResponseType } from "hono/client";
import type { AppType } from "../../server/index.js";
import type { ApiError, Tokens } from "./types";
// Create a temporary client just for type inference
const _rpc = hc<AppType>("");
// Infer response types from server definitions
export type LoginResponse = InferResponseType<typeof _rpc.api.auth.login.$post>;
export type User = LoginResponse["user"];
export class ApiClientError extends Error {
constructor(
message: string,
public status: number,
public code?: string,
) {
super(message);
this.name = "ApiClientError";
}
}
export interface TokenStorage {
getTokens(): Tokens | null;
setTokens(tokens: Tokens): void;
clearTokens(): void;
}
const TOKEN_STORAGE_KEY = "kioku_tokens";
export const localStorageTokenStorage: TokenStorage = {
getTokens(): Tokens | null {
const stored = localStorage.getItem(TOKEN_STORAGE_KEY);
if (!stored) return null;
try {
return JSON.parse(stored) as Tokens;
} catch {
return null;
}
},
setTokens(tokens: Tokens): void {
localStorage.setItem(TOKEN_STORAGE_KEY, JSON.stringify(tokens));
},
clearTokens(): void {
localStorage.removeItem(TOKEN_STORAGE_KEY);
},
};
export interface ApiClientOptions {
baseUrl?: string;
tokenStorage?: TokenStorage;
}
// RPC client type - use this for type-safe API calls
export type Client = ReturnType<typeof hc<AppType>>;
export function createClient(baseUrl: string): Client {
return hc<AppType>(baseUrl);
}
export type SessionExpiredCallback = () => void;
export class ApiClient {
private tokenStorage: TokenStorage;
private refreshPromise: Promise<boolean> | null = null;
private baseUrl: string;
private sessionExpiredCallback: SessionExpiredCallback | null = null;
public readonly rpc: Client;
constructor(options: ApiClientOptions = {}) {
this.baseUrl = options.baseUrl ?? window.location.origin;
this.tokenStorage = options.tokenStorage ?? localStorageTokenStorage;
this.rpc = this.createAuthenticatedClient();
}
onSessionExpired(callback: SessionExpiredCallback): () => void {
this.sessionExpiredCallback = callback;
return () => {
this.sessionExpiredCallback = null;
};
}
private createAuthenticatedClient(): Client {
return hc<AppType>(this.baseUrl, {
fetch: async (input: RequestInfo | URL, init?: RequestInit) => {
return this.authenticatedFetch(input, init);
},
});
}
async authenticatedFetch(
input: RequestInfo | URL,
init?: RequestInit,
): Promise<Response> {
const tokens = this.tokenStorage.getTokens();
const headers = new Headers(init?.headers);
if (tokens?.accessToken && !headers.has("Authorization")) {
headers.set("Authorization", `Bearer ${tokens.accessToken}`);
}
const response = await fetch(input, { ...init, headers });
if (response.status === 401 && tokens?.refreshToken) {
// Try to refresh the token
const refreshed = await this.refreshToken();
if (refreshed) {
// Retry with new token
const newTokens = this.tokenStorage.getTokens();
if (newTokens?.accessToken) {
headers.set("Authorization", `Bearer ${newTokens.accessToken}`);
}
return fetch(input, { ...init, headers });
}
}
return response;
}
private async handleResponse<T>(response: Response): Promise<T> {
if (!response.ok) {
const errorBody = (await response.json().catch(() => ({}))) as ApiError;
throw new ApiClientError(
errorBody.error?.message ||
`Request failed with status ${response.status}`,
response.status,
errorBody.error?.code,
);
}
if (response.status === 204) {
return undefined as T;
}
return response.json() as Promise<T>;
}
private async refreshToken(): Promise<boolean> {
if (this.refreshPromise) {
return this.refreshPromise;
}
this.refreshPromise = this.doRefreshToken();
try {
return await this.refreshPromise;
} finally {
this.refreshPromise = null;
}
}
private async doRefreshToken(): Promise<boolean> {
const tokens = this.tokenStorage.getTokens();
if (!tokens?.refreshToken) {
return false;
}
try {
// Use raw fetch to avoid infinite loop through authenticatedFetch
const res = await fetch(`${this.baseUrl}/api/auth/refresh`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify({ refreshToken: tokens.refreshToken }),
});
if (!res.ok) {
// Clear tokens if refresh fails and notify listeners
this.tokenStorage.clearTokens();
this.sessionExpiredCallback?.();
return false;
}
const data = (await res.json()) as {
accessToken: string;
refreshToken: string;
};
this.tokenStorage.setTokens({
accessToken: data.accessToken,
refreshToken: data.refreshToken,
});
return true;
} catch {
return false;
}
}
async login(username: string, password: string): Promise<LoginResponse> {
const res = await this.rpc.api.auth.login.$post({
json: { username, password },
});
const data = await this.handleResponse<LoginResponse>(res);
this.tokenStorage.setTokens({
accessToken: data.accessToken,
refreshToken: data.refreshToken,
});
return data;
}
logout(): void {
this.tokenStorage.clearTokens();
}
isAuthenticated(): boolean {
return this.tokenStorage.getTokens() !== null;
}
getTokens(): Tokens | null {
return this.tokenStorage.getTokens();
}
getAuthHeader(): { Authorization: string } | undefined {
const tokens = this.tokenStorage.getTokens();
if (tokens?.accessToken) {
return { Authorization: `Bearer ${tokens.accessToken}` };
}
return undefined;
}
}
export const apiClient = new ApiClient();
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