ganze project

node_modules/pdf-parse/dist/node/esm/getHeader.js

@@ -0,0 +1,66 @@
+import * as http from 'node:http';
+import * as https from 'node:https';
+async function nodeRequest(u, method, headers) {
+    return new Promise((resolve, reject) => {
+        const reqFn = u.protocol === 'https:' ? https.request : http.request;
+        const req = reqFn(u, { method, headers }, (res) => {
+            const headersObj = {};
+            for (const [k, v] of Object.entries(res.headers)) {
+                headersObj[k] = Array.isArray(v) ? v.join(',') : (v ?? '');
+            }
+            const chunks = [];
+            res.on('data', (c) => chunks.push(Buffer.from(c)));
+            res.on('end', () => {
+                const buffer = chunks.length ? Buffer.concat(chunks) : undefined;
+                resolve({ status: res.statusCode ?? 0, headers: headersObj, buffer });
+            });
+        });
+        req.on('error', (err) => reject(err));
+        req.end();
+    });
+}
+/**
+ * Perform an HTTP HEAD request to retrieve the file size and verify existence;
+ * when `check` is true, fetch a small range and inspect the magic number to confirm the URL points to a valid PDF.
+ * If the server does not support range requests, `isPdf` will be set to `false`.
+ * @param url - The URL of the PDF file to check. Can be a string or URL object.
+ * @param check - When `true`, download a small byte range (first 4 bytes) to validate the file signature by checking for '%PDF' magic bytes. Default: `false`.
+ * @returns - A Promise that resolves to a HeaderResult object containing the response status, size, headers, and PDF validation result.
+ * @public
+ */
+export async function getHeader(url, check = false) {
+    try {
+        const u = typeof url === 'string' ? new URL(url) : url;
+        const headResp = await nodeRequest(u, 'HEAD');
+        const size = headResp.headers['content-length'] ? parseInt(headResp.headers['content-length'], 10) : undefined;
+        let magic = null;
+        if (check) {
+            const rangeResp = await nodeRequest(u, 'GET', { Range: 'bytes=0-4' });
+            if (rangeResp.status >= 200 && rangeResp.status < 300 && rangeResp.buffer) {
+                const headerStr = rangeResp.buffer.slice(0, 4).toString('utf8');
+                magic = headerStr.startsWith('%PDF');
+            }
+            else {
+                magic = false;
+            }
+        }
+        return {
+            ok: headResp.status >= 200 && headResp.status < 300,
+            status: headResp.status,
+            size,
+            magic,
+            headers: headResp.headers,
+        };
+    }
+    catch (error) {
+        return {
+            ok: false,
+            status: undefined,
+            size: undefined,
+            magic: false,
+            headers: {},
+            error: new Error(String(error)),
+        };
+    }
+}
+//# sourceMappingURL=getHeader.js.map