A self-hosted orchestration system crafted for power users. composia.xyz
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150const minimumSize = 1024;const gzipEtagSuffix = "-gzip";
const compressibleContentTypes = [ "application/javascript", "application/json", "application/manifest+json", "application/wasm", "application/xml", "image/svg+xml",];
function acceptsGzip(value) { const encodings = new Map( value.split(",").map((entry) => { const [encoding, ...parameters] = entry.trim().toLowerCase().split(";"); const quality = parameters .map((parameter) => parameter.trim().match(/^q=(\d*(?:\.\d+)?)$/)?.[1]) .find(Boolean); return [encoding, quality === undefined ? 1 : Number(quality)]; }), ); return (encodings.get("gzip") ?? encodings.get("*") ?? 0) > 0;}
function appendVary(headers, value) { const values = (headers.get("vary") ?? "") .split(",") .map((entry) => entry.trim()) .filter(Boolean); if (!values.some((entry) => entry.toLowerCase() === value.toLowerCase())) { values.push(value); } headers.set("vary", values.join(", "));}
function gzipEtag(value) { return value.replace( /^(W\/)?"([^\"]*)"$/, (_, weak = "", opaque) => `${weak}"${opaque}${gzipEtagSuffix}"`, );}
function identityEtags(value) { if (value.trim() === "*") return "*"; return value .split(",") .map((entry) => entry.trim()) .filter((entry) => entry.endsWith(`${gzipEtagSuffix}"`)) .map((entry) => entry.replace(new RegExp(`${gzipEtagSuffix}("$)`), "$1")) .join(", ");}
export function prepareCompressionRequest(request) { if ( request.method !== "GET" || !acceptsGzip(request.headers.get("accept-encoding") ?? "") ) { return request; }
const ifNoneMatch = request.headers.get("if-none-match"); if (!ifNoneMatch) return request;
const headers = new Headers(request.headers); const etags = identityEtags(ifNoneMatch); if (etags) headers.set("if-none-match", etags); else headers.delete("if-none-match"); return new Request(request, { headers });}
function isCompressible(response) { const contentType = response.headers.get("content-type")?.toLowerCase() ?? ""; const contentLengthHeader = response.headers.get("content-length"); const contentLength = contentLengthHeader ? Number(contentLengthHeader) : NaN; return ( response.status !== 204 && response.status !== 205 && response.status !== 304 && !response.headers.has("content-encoding") && !response.headers.has("content-range") && !response.headers .get("cache-control") ?.toLowerCase() .includes("no-transform") && !contentType.startsWith("text/event-stream") && (!Number.isFinite(contentLength) || contentLength >= minimumSize) && (contentType.startsWith("text/") || compressibleContentTypes.some((type) => contentType.startsWith(type))) );}
export function compressResponse(request, response) { if (response.status === 304) { const headers = new Headers(response.headers); appendVary(headers, "Accept-Encoding"); if ( acceptsGzip(request.headers.get("accept-encoding") ?? "") && request.headers .get("if-none-match") ?.split(",") .some( (etag) => etag.trim() === "*" || etag.trim().endsWith(`${gzipEtagSuffix}"`), ) ) { headers.set("content-encoding", "gzip"); const etag = headers.get("etag"); if (etag) headers.set("etag", gzipEtag(etag)); } return new Response(null, { status: response.status, statusText: response.statusText, headers, }); }
if (!isCompressible(response)) { return response; }
const headers = new Headers(response.headers); appendVary(headers, "Accept-Encoding");
if ( request.method === "HEAD" || !acceptsGzip(request.headers.get("accept-encoding") ?? "") ) { return new Response(response.body, { status: response.status, statusText: response.statusText, headers, }); }
headers.set("content-encoding", "gzip"); headers.delete("content-length"); const etag = headers.get("etag"); if (etag) headers.set("etag", gzipEtag(etag));
return new Response( response.body?.pipeThrough(new CompressionStream("gzip")) ?? null, { status: response.status, statusText: response.statusText, headers, }, );}