"use client";

// @ts-ignore
// eslint-disable-next-line import/no-extraneous-dependencies
import { createFromFetch } from "react-server-dom-webpack/client";
import { NEXT_ROUTER_PREFETCH, NEXT_ROUTER_STATE_TREE, NEXT_RSC_UNION_QUERY, NEXT_URL, RSC, RSC_CONTENT_TYPE_HEADER } from "../app-router-headers";
import { urlToUrlWithoutFlightMarker } from "../app-router";
import { callServer } from "../../app-call-server";
import { PrefetchKind } from "./router-reducer-types";
import { hexHash } from "../../../shared/lib/hash";
function doMpaNavigation(url) {
    return [
        urlToUrlWithoutFlightMarker(url).toString(),
        undefined
    ];
}
/**
 * Fetch the flight data for the provided url. Takes in the current router state to decide what to render server-side.
 */ export async function fetchServerResponse(url, flightRouterState, nextUrl, currentBuildId, prefetchKind) {
    const headers = {
        // Enable flight response
        [RSC]: "1",
        // Provide the current router state
        [NEXT_ROUTER_STATE_TREE]: encodeURIComponent(JSON.stringify(flightRouterState))
    };
    /**
   * Three cases:
   * - `prefetchKind` is `undefined`, it means it's a normal navigation, so we want to prefetch the page data fully
   * - `prefetchKind` is `full` - we want to prefetch the whole page so same as above
   * - `prefetchKind` is `auto` - if the page is dynamic, prefetch the page data partially, if static prefetch the page data fully
   */ if (prefetchKind === PrefetchKind.AUTO) {
        headers[NEXT_ROUTER_PREFETCH] = "1";
    }
    if (nextUrl) {
        headers[NEXT_URL] = nextUrl;
    }
    const uniqueCacheQuery = hexHash([
        headers[NEXT_ROUTER_PREFETCH] || "0",
        headers[NEXT_ROUTER_STATE_TREE],
        headers[NEXT_URL]
    ].join(","));
    try {
        let fetchUrl = new URL(url);
        if (process.env.NODE_ENV === "production") {
            if (process.env.__NEXT_CONFIG_OUTPUT === "export") {
                if (fetchUrl.pathname.endsWith("/")) {
                    fetchUrl.pathname += "index.txt";
                } else {
                    fetchUrl.pathname += ".txt";
                }
            }
        }
        // Add unique cache query to avoid caching conflicts on CDN which don't respect to Vary header
        fetchUrl.searchParams.set(NEXT_RSC_UNION_QUERY, uniqueCacheQuery);
        const res = await fetch(fetchUrl, {
            // Backwards compat for older browsers. `same-origin` is the default in modern browsers.
            credentials: "same-origin",
            headers
        });
        const responseUrl = urlToUrlWithoutFlightMarker(res.url);
        const canonicalUrl = res.redirected ? responseUrl : undefined;
        const contentType = res.headers.get("content-type") || "";
        let isFlightResponse = contentType === RSC_CONTENT_TYPE_HEADER;
        if (process.env.NODE_ENV === "production") {
            if (process.env.__NEXT_CONFIG_OUTPUT === "export") {
                if (!isFlightResponse) {
                    isFlightResponse = contentType.startsWith("text/plain");
                }
            }
        }
        // If fetch returns something different than flight response handle it like a mpa navigation
        // If the fetch was not 200, we also handle it like a mpa navigation
        if (!isFlightResponse || !res.ok) {
            return doMpaNavigation(responseUrl.toString());
        }
        // Handle the `fetch` readable stream that can be unwrapped by `React.use`.
        const [buildId, flightData] = await createFromFetch(Promise.resolve(res), {
            callServer
        });
        if (currentBuildId !== buildId) {
            return doMpaNavigation(res.url);
        }
        return [
            flightData,
            canonicalUrl
        ];
    } catch (err) {
        console.error("Failed to fetch RSC payload. Falling back to browser navigation.", err);
        // If fetch fails handle it like a mpa navigation
        // TODO-APP: Add a test for the case where a CORS request fails, e.g. external url redirect coming from the response.
        // See https://github.com/vercel/next.js/issues/43605#issuecomment-1451617521 for a reproduction.
        return [
            url.toString(),
            undefined
        ];
    }
}

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