next/dist/experimental/testmode/fetch.js

The React Framework

"use strict";
Object.defineProperty(exports, "__esModule", {
    value: true
});
0 && (module.exports = {
    handleFetch: null,
    interceptFetch: null,
    reader: null
});
function _export(target, all) {
    for(var name in all)Object.defineProperty(target, name, {
        enumerable: true,
        get: all[name]
    });
}
_export(exports, {
    handleFetch: function() {
        return handleFetch;
    },
    interceptFetch: function() {
        return interceptFetch;
    },
    reader: function() {
        return reader;
    }
});
const _context = require("./context");
const reader = {
    url (req) {
        return req.url;
    },
    header (req, name) {
        return req.headers.get(name);
    }
};
function getTestStack() {
    let stack = (new Error().stack ?? '').split('\n');
    // Skip the first line and find first non-empty line.
    for(let i = 1; i < stack.length; i++){
        if (stack[i].length > 0) {
            stack = stack.slice(i);
            break;
        }
    }
    // Filter out franmework lines.
    stack = stack.filter((f)=>!f.includes('/next/dist/'));
    // At most 5 lines.
    stack = stack.slice(0, 5);
    // Cleanup some internal info and trim.
    stack = stack.map((s)=>s.replace('webpack-internal:///(rsc)/', '').trim());
    return stack.join('    ');
}
async function buildProxyRequest(testData, request) {
    const { url, method, headers, body, cache, credentials, integrity, mode, redirect, referrer, referrerPolicy } = request;
    return {
        testData,
        api: 'fetch',
        request: {
            url,
            method,
            headers: [
                ...Array.from(headers),
                [
                    'next-test-stack',
                    getTestStack()
                ]
            ],
            body: body ? Buffer.from(await request.arrayBuffer()).toString('base64') : null,
            cache,
            credentials,
            integrity,
            mode,
            redirect,
            referrer,
            referrerPolicy
        }
    };
}
function buildResponse(proxyResponse) {
    const { status, headers, body } = proxyResponse.response;
    return new Response(body ? Buffer.from(body, 'base64') : null, {
        status,
        headers: new Headers(headers)
    });
}
async function handleFetch(originalFetch, request) {
    const testInfo = (0, _context.getTestReqInfo)(request, reader);
    if (!testInfo) {
        // Passthrough non-test requests.
        return originalFetch(request);
    }
    const { testData, proxyPort } = testInfo;
    const proxyRequest = await buildProxyRequest(testData, request);
    const resp = await originalFetch(`http://localhost:${proxyPort}`, {
        method: 'POST',
        body: JSON.stringify(proxyRequest),
        next: {
            // @ts-ignore
            internal: true
        }
    });
    if (!resp.ok) {
        throw Object.defineProperty(new Error(`Proxy request failed: ${resp.status}`), "__NEXT_ERROR_CODE", {
            value: "E146",
            enumerable: false,
            configurable: true
        });
    }
    const proxyResponse = await resp.json();
    const { api } = proxyResponse;
    switch(api){
        case 'continue':
            return originalFetch(request);
        case 'abort':
        case 'unhandled':
            throw Object.defineProperty(new Error(`Proxy request aborted [${request.method} ${request.url}]`), "__NEXT_ERROR_CODE", {
                value: "E145",
                enumerable: false,
                configurable: true
            });
        default:
            break;
    }
    return buildResponse(proxyResponse);
}
function interceptFetch(originalFetch) {
    global.fetch = function testFetch(input, init) {
        var _init_next;
        // Passthrough internal requests.
        // @ts-ignore
        if (init == null ? void 0 : (_init_next = init.next) == null ? void 0 : _init_next.internal) {
            return originalFetch(input, init);
        }
        return handleFetch(originalFetch, new Request(input, init));
    };
    return ()=>{
        global.fetch = originalFetch;
    };
}

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