Gerhard Scheikl
82 lines
2.9 KiB
TypeScript
82 lines
2.9 KiB
TypeScript
/**
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* Fetches product images for invoice line items and returns them as
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* `data:` URLs ready to embed in the PDF.
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*
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* Uses a simple in-process LRU-ish Map keyed by URL. Images are typically
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* served from Shopify's CDN so re-fetching is cheap, but caching avoids
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* hammering the network when regenerating an invoice multiple times.
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*/
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const MAX_BYTES = 2 * 1024 * 1024; // 2 MB cap per image
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const CACHE_MAX_ENTRIES = 200;
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const cache = new Map<string, string>(); // url -> data URL
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function rememberInCache(url: string, dataUrl: string) {
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if (cache.size >= CACHE_MAX_ENTRIES) {
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// Drop the oldest entry (Map preserves insertion order).
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const oldest = cache.keys().next().value;
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if (oldest) cache.delete(oldest);
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}
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cache.set(url, dataUrl);
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}
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function guessContentType(url: string, headerCt: string | null): string {
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if (headerCt && headerCt.startsWith("image/")) return headerCt;
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const lower = url.toLowerCase();
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if (lower.includes(".jpg") || lower.includes(".jpeg")) return "image/jpeg";
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if (lower.includes(".webp")) return "image/webp";
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if (lower.includes(".gif")) return "image/gif";
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return "image/png";
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}
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export async function fetchProductImageDataUrl(url: string): Promise<string | undefined> {
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if (!url) return undefined;
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const hit = cache.get(url);
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if (hit) return hit;
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// Request a small Shopify CDN variant when possible to keep the PDF lean.
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// Shopify image URLs accept a `width=` query param; fall back to the original URL.
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const requestUrl = url.includes("cdn.shopify.com") && !/[?&](width|height|crop)=/.test(url)
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? `${url}${url.includes("?") ? "&" : "?"}width=128`
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: url;
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let res: Response;
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try {
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res = await fetch(requestUrl);
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} catch (err) {
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console.warn(`Product image fetch failed for ${url}:`, err);
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return undefined;
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}
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if (!res.ok) {
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console.warn(`Product image HTTP ${res.status} for ${url}`);
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return undefined;
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}
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const buf = await res.arrayBuffer();
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if (buf.byteLength === 0 || buf.byteLength > MAX_BYTES) return undefined;
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const contentType = guessContentType(url, res.headers.get("content-type"));
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// @react-pdf supports png/jpeg natively; webp/gif are unreliable. Skip those.
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if (contentType !== "image/png" && contentType !== "image/jpeg") return undefined;
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const b64 = Buffer.from(buf).toString("base64");
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const dataUrl = `data:${contentType};base64,${b64}`;
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rememberInCache(url, dataUrl);
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return dataUrl;
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}
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/**
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* Resolves images for every line in parallel, mutating `imageDataUrl` in place.
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* Failures are swallowed (the row simply renders without an icon).
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*/
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export async function attachLineItemImages(
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lines: { imageUrl?: string; imageDataUrl?: string }[],
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): Promise<void> {
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await Promise.all(
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lines.map(async (line) => {
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if (!line.imageUrl) return;
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const dataUrl = await fetchProductImageDataUrl(line.imageUrl);
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if (dataUrl) line.imageDataUrl = dataUrl;
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}),
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);
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}
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