fix: Local files paths for Vercel (#1016)

lib/file-utils.ts

@@ -0,0 +1,6 @@
+import fs from 'fs';
+import path from 'path';
+
+export const readFileSyncFromPublicStaticFolder = (filePath: string): Uint8Array => {
+  return fs.readFileSync(path.join(process.cwd(), 'public/static', filePath));
+};

lib/pdf-lib-utils.ts

@@ -1,11 +1,11 @@
-import fs from 'fs';
 import { get, isNil } from 'lodash';
 import { scaleValue } from './math';
 import fontkit from 'pdf-fontkit';
 import { PDFDocument, PDFField, PDFFont, PDFForm, PDFHexString, PDFTextField, TextAlignment } from 'pdf-lib';
 import { allCharsValid } from './string-utils';
+import { readFileSyncFromPublicStaticFolder } from './file-utils';
 
-const SIGNATURE_FONT_BYTES = fs.readFileSync('resources/fonts/JustMeAgainDownHere-Regular.ttf');
+const SIGNATURE_FONT_BYTES = readFileSyncFromPublicStaticFolder('fonts/JustMeAgainDownHere-Regular.ttf');
 
 export const logAllFieldsFromPDFForm = (pdfForm) => {
   for (const field of pdfForm.getFields()) {

lib/tax-forms/index.ts

@@ -1,8 +1,8 @@
-import fs from 'fs';
 import { fillW9TaxForm } from './w9';
 import { fillW8BenTaxForm } from './w8-ben';
 import { PDFDocument, PDFFont } from 'pdf-lib';
 import { fillW8BenETaxForm } from './w8-ben-e';
+import { readFileSyncFromPublicStaticFolder } from '../file-utils';
 
 type TaxFormType = 'W9' | 'W8_BEN' | 'W8_BEN_E';
 
@@ -17,15 +17,15 @@ export const TAX_FORMS: Record<
   }
 > = {
   W9: {
-    bytes: fs.readFileSync('resources/tax-forms/fw9.pdf'),
+    bytes: readFileSyncFromPublicStaticFolder('tax-forms/fw9.pdf'),
     fillPDF: fillW9TaxForm,
   },
   W8_BEN: {
-    bytes: fs.readFileSync('resources/tax-forms/fw8ben.pdf'),
+    bytes: readFileSyncFromPublicStaticFolder('tax-forms/fw8ben.pdf'),
     fillPDF: fillW8BenTaxForm,
   },
   W8_BEN_E: {
-    bytes: fs.readFileSync('resources/tax-forms/fw8bene.pdf'),
+    bytes: readFileSyncFromPublicStaticFolder('tax-forms/fw8bene.pdf'),
     fillPDF: fillW8BenETaxForm,
   },
 } as const;

pages/api/tax-form/[filename].ts

@@ -1,12 +1,12 @@
 import { PDFDocument, StandardFonts } from 'pdf-lib';
-import fs from 'fs';
 import fontkit from 'pdf-fontkit';
 import { TAX_FORMS, isValidTaxFormType } from '../../../lib/tax-forms';
 import { getFullName } from '../../../lib/tax-forms/utils';
 import { flattenForm } from '../../../lib/pdf-lib-utils';
 import { allCharsValid } from '../../../lib/string-utils';
+import { readFileSyncFromPublicStaticFolder } from '../../../lib/file-utils';
 
-const MAIN_FONT_BYTES = fs.readFileSync('resources/fonts/NanumGothic-Regular.ttf');
+const MAIN_FONT_BYTES = readFileSyncFromPublicStaticFolder('fonts/NanumGothic-Regular.ttf');
 
 export default async function handler(req, res) {
   // Get values from query
@@ -76,5 +76,6 @@ export default async function handler(req, res) {
   const pdfBytes = await pdfDoc.save();
   res.setHeader('Content-Type', 'application/pdf');
   res.setHeader('Access-Control-Allow-Origin', '*'); // TODO
+  res.setHeader('cache-control', 'no-cache');
   res.send(Buffer.from(pdfBytes));
 }