basic XML import works + small fixes

plugins/dbgate-plugin-xml/src/backend/writer.js

@@ -1,19 +1,68 @@
 const fs = require('fs');
 const stream = require('stream');
 
+function escapeXml(value) {
+  return value.replace(/[<>&'"]/g, function (c) {
+    switch (c) {
+      case '<':
+        return '&lt;';
+      case '>':
+        return '&gt;';
+      case '&':
+        return '&amp;';
+      case "'":
+        return '&apos;';
+      case '"':
+        return '&quot;';
+    }
+  });
+}
+
 class StringifyStream extends stream.Transform {
-  constructor() {
+  constructor({ itemElementName, rootElementName }) {
     super({ objectMode: true });
+    this.itemElementName = itemElementName;
+    this.rootElementName = rootElementName;
+
+    this.startElement(this.rootElementName);
   }
+
+  startElement(element) {
+    this.push('<');
+    this.push(element);
+    this.push('>\n');
+  }
+
+  endElement(element) {
+    this.push('</');
+    this.push(element);
+    this.push('>\n');
+  }
+
+  elementValue(element, value) {
+    this.startElement(element);
+    this.push(escapeXml(`${value}`));
+    this.endElement(element);
+  }
+
   _transform(chunk, encoding, done) {
-    this.push(JSON.stringify(chunk) + '\n');
+    this.startElement(this.itemElementName);
+    for (const key of Object.keys(chunk)) {
+      this.elementValue(key, chunk[key]);
+    }
+    this.endElement(this.itemElementName);
     done();
   }
+
+  _final(callback) {
+    this.endElement(this.rootElementName);
+    callback();
+  }
 }
 
-async function writer({ fileName, encoding = 'utf-8' }) {
+async function writer({ fileName, encoding = 'utf-8', itemElementName, rootElementName }) {
   console.log(`Writing file ${fileName}`);
-  const stringify = new StringifyStream();
+  const stringify = new StringifyStream({ itemElementName, rootElementName });
   const fileStream = fs.createWriteStream(fileName, encoding);
   stringify.pipe(fileStream);
   stringify['finisher'] = fileStream;