1 files changed, 93 insertions, 0 deletions
diff --git a/code/frontend/src/utils/_fetch.ts b/code/frontend/src/utils/_fetch.ts
new file mode 100644
index 0000000..f884653
--- /dev/null
+++ b/code/frontend/src/utils/_fetch.ts
@@ -0,0 +1,93 @@
+import { Temporal } from "temporal-polyfill";
+import { redirect } from "@sveltejs/kit";
+import { browser } from "$app/environment";
+import { goto } from "$app/navigation";
+import { SignInPageMessage, signInPageMessageQueryKey } from "$routes/(main)/(public)/sign-in";
+import { AccountService } from "$services/account-service";
+
+
+export async function http_post_async(url: string, body?: object | string, timeout = -1, skip_401_check = false, abort_signal?: AbortSignal): Promise<Response> {
+    const init = make_request_init("post", body, abort_signal);
+    const response = await internal_fetch_async({ url, init, timeout });
+    if (!skip_401_check && await redirect_if_401_async(response)) throw new Error("Server returned 401");
+    return response;
+}
+
+export async function http_get_async(url: string, timeout = -1, skip_401_check = false, abort_signal?: AbortSignal): Promise<Response> {
+    const init = make_request_init("get", undefined, abort_signal);
+    const response = await internal_fetch_async({ url, init, timeout });
+    if (!skip_401_check && await redirect_if_401_async(response)) throw new Error("Server returned 401");
+    return response;
+}
+
+export async function http_delete_async(url: string, body?: object | string, timeout = -1, skip_401_check = false, abort_signal?: AbortSignal): Promise<Response> {
+    const init = make_request_init("delete", body, abort_signal);
+    const response = await internal_fetch_async({ url, init, timeout });
+    if (!skip_401_check && await redirect_if_401_async(response)) throw new Error("Server returned 401");
+    return response;
+}
+
+async function internal_fetch_async(request: InternalFetchRequest): Promise<Response> {
+    if (!request.init) throw new Error("request.init is required");
+    const fetch_request = new Request(request.url, request.init);
+    let response: any;
+
+    try {
+        if (request.timeout && request.timeout > 500) {
+            response = await Promise.race([
+                fetch(fetch_request),
+                new Promise((_, reject) => setTimeout(() => reject(new Error("Timeout")), request.timeout)),
+            ]);
+        } else {
+            response = await fetch(fetch_request);
+        }
+    } catch (error: any) {
+        if (error.message === "Timeout") {
+            console.error("Request timed out", error);
+        } else if (error.message === "Network request failed") {
+            console.error("No internet connection", error);
+        } else {
+            throw error;
+        }
+    }
+
+    return response;
+}
+
+async function redirect_if_401_async(response: Response): Promise<boolean> {
+    if (response.status === 401) {
+        const redirectUrl = `/sign-in?${signInPageMessageQueryKey}=${SignInPageMessage.LOGGED_OUT}`;
+        await AccountService.resolve().end_session_async();
+        if (browser) {
+            await goto(redirectUrl);
+        } else {
+            throw redirect(307, redirectUrl);
+        }
+    }
+    return false;
+}
+
+function make_request_init(method: string, body?: any, signal?: AbortSignal): RequestInit {
+    const init = {
+        method,
+        credentials: "include",
+        signal,
+        headers: {
+            "X-TimeZone": Temporal.Now.timeZone().id,
+        },
+    } as RequestInit;
+
+    if (body) {
+        init.body = JSON.stringify(body);
+        init.headers["Content-Type"] = "application/json;charset=UTF-8";
+    }
+
+    return init;
+}
+
+export type InternalFetchRequest = {
+    url: string,
+    init: RequestInit,
+    timeout?: number
+    retry_count?: number,
+}
+\ No newline at end of file