2569718930@qq.com
41 lines
1.1 KiB
TypeScript
41 lines
1.1 KiB
TypeScript
import { createHash } from "node:crypto";
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import { NextRequest, NextResponse } from "next/server";
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function normalizeTag(tag: string) {
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return tag.trim().replace(/^W\//i, "");
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}
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function ifNoneMatchHit(ifNoneMatch: string | null, etag: string) {
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if (!ifNoneMatch) return false;
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const target = normalizeTag(etag);
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return ifNoneMatch
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.split(",")
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.map((part) => normalizeTag(part))
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.some((part) => part === "*" || part === target);
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}
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function buildEtag(body: string) {
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const hash = createHash("sha1").update(body).digest("hex");
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return `"${hash}"`;
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}
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export function buildCachedJsonResponse(
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req: NextRequest,
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payload: unknown,
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cacheControl: string,
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) {
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const body = JSON.stringify(payload);
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const etag = buildEtag(body);
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const headers = new Headers({
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"Cache-Control": cacheControl,
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ETag: etag,
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"Content-Type": "application/json; charset=utf-8",
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});
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if (ifNoneMatchHit(req.headers.get("if-none-match"), etag)) {
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return new NextResponse(null, { status: 304, headers });
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}
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return new NextResponse(body, { status: 200, headers });
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}
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