Add +server convertPdf route and requestPdfConversion.ts

Author: julien-blanchon

src/lib/server/pdfconvert/requestPdfConversion.ts

@@ -0,0 +1,72 @@
+import { MATHPIX_APP_ID, MATHPIX_APP_KEY } from "$env/static/private";
+
+type MathpixOptions = {
+  conversion_formats: {
+    'md': boolean;
+    'docx': boolean;
+    'tex.zip': boolean;
+    'html': boolean;
+  };
+  math_inline_delimiters: string[];
+  rm_spaces: boolean;
+};
+
+const defaultOptions: MathpixOptions = {
+  conversion_formats: {
+    'md': true,
+    'docx': false,
+    'tex.zip': false,
+    'html': false,
+  },
+  math_inline_delimiters: ['$', '$'],
+  rm_spaces: true,
+};
+
+// See https://docs.mathpix.com/#process-a-pdf
+async function requestPdfConversion(file: Blob, option: MathpixOptions = defaultOptions): Promise<string> {
+  const BASE_URL = 'https://api.mathpix.com/v3';
+  const headers = {
+    'app_id': MATHPIX_APP_ID,
+    'app_key': MATHPIX_APP_KEY
+  };
+
+  // Start the conversion
+  const formData = new FormData();
+  formData.append('file', file);
+  formData.append('options_json', JSON.stringify(option));
+
+  const initialResponse = await fetch(`${BASE_URL}/pdf`, {
+    method: 'POST',
+    headers: headers,
+    body: formData
+  });
+
+  const { pdf_id } = await initialResponse.json();
+
+  // Check conversion status
+  let conversionCompleted = false;
+  while (!conversionCompleted) {
+    const statusResponse = await fetch(`${BASE_URL}/converter/${pdf_id}`, {
+      method: 'GET',
+      headers: headers
+    });
+
+    const statusData = await statusResponse.json();
+    if (statusData.status === "completed") {
+      conversionCompleted = true;
+    } else {
+      // Wait for a 1 second before polling again
+      await new Promise(resolve => setTimeout(resolve, 1000));
+    }
+  }
+
+  // Fetch the markdown data
+  const markdownResponse = await fetch(`${BASE_URL}/converter/${pdf_id}.md`, {
+    method: 'GET',
+    headers: headers
+  });
+
+  return await markdownResponse.text();
+}
+
+export { requestPdfConversion };

src/routes/convertPdf/+server.ts

@@ -0,0 +1,8 @@
+import { requestPdfConversion } from '$lib/server/pdfconvert/requestPdfConversion';
+import { json } from '@sveltejs/kit';
+
+export async function POST({ request }) {
+    const blob = await request.blob()
+    const result = await requestPdfConversion(blob);
+    return json({ result }, { status: 201 });
+}