55 lines
2 KiB
TypeScript
55 lines
2 KiB
TypeScript
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// ชนิดไฟล์เอกสาร — derive จาก extension ของ path ที่เก็บใน files.pdf_url (N3)
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// ไม่มี column kind ใน DB: extension คือ single source of truth (seed idempotent อิง URL)
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// pure module — ใช้ได้ทั้ง server และ client
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export type FileKind = "pdf" | "image";
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export type ImageFormat = "jpeg" | "png" | "tiff";
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const IMAGE_EXTENSIONS: Record<string, ImageFormat> = {
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".jpg": "jpeg",
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".jpeg": "jpeg",
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".png": "png",
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".tif": "tiff",
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".tiff": "tiff",
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};
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/** extension (ตัวเล็ก พร้อมจุดนำหน้า) ของ path หลังตัด query string — ไม่มี = "" */
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function extOf(url: string): string {
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const clean = url.split(/[?#]/, 1)[0];
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const slash = Math.max(clean.lastIndexOf("/"), clean.lastIndexOf("\\"));
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const name = slash >= 0 ? clean.slice(slash + 1) : clean;
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const dot = name.lastIndexOf(".");
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return dot <= 0 ? "" : name.slice(dot).toLowerCase();
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}
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export function imageFormatFromUrl(url: string): ImageFormat | null {
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return IMAGE_EXTENSIONS[extOf(url)] ?? null;
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}
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/** ไม่รู้จัก extension → "pdf" ตามพฤติกรรมเดิม (ก่อน N3 ทุกไฟล์เปิดเป็น PDF) */
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export function fileKindFromUrl(url: string): FileKind {
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if (imageFormatFromUrl(url)) return "image";
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return "pdf";
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}
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/** whitelist extension ที่ seed-samples sync จาก public/samples/ (seed .mjs มีสำเนา — sync กัน) */
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export const SAMPLE_FILE_EXTENSIONS: readonly string[] = [
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".pdf",
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".jpg",
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".jpeg",
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".png",
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".tif",
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".tiff",
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];
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const IMAGE_CONTENT_TYPES: Record<ImageFormat, string> = {
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jpeg: "image/jpeg",
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png: "image/png",
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tiff: "image/tiff",
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};
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export function imageContentTypeFromUrl(url: string): string {
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const format = imageFormatFromUrl(url);
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return format ? IMAGE_CONTENT_TYPES[format] : "application/octet-stream";
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}
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