Migrate backend to n8n

backend/function.js

@@ -0,0 +1,81 @@
+const parseReport = (text) => {
+
+    const start = new Date();
+    const lines = text.split(/\r?\n/);
+
+    const metadata = {};
+    let header = null;
+    const records = [];
+
+    for (const line of lines) {
+
+        // empty
+        if (!line) {
+            continue
+        }
+
+        // metadata
+        if (line.startsWith("#")) {
+            if (!line.includes(":")) {
+                continue;
+            }
+            const parts = line.substring(1).split(":", 2);
+            if (parts.length !== 2) {
+                return {error: `Invalid metadata: '${line}'`};
+            }
+            const key = parts[0].trim().toLowerCase();
+            metadata[key] = parts[1].trim();
+            continue;
+        }
+
+        // header
+        if (header === null) {
+            const parts = line.split(",");
+            if (parts.length < 2) {
+                return {error: `Invalid header: '${line}'`};
+            }
+            header = parts;
+            continue;
+        }
+
+        // data
+        const parts = line.split(",");
+        if (parts.length !== header.length) {
+            return {error: `Invalid record: '${line}'`};
+        }
+
+        records.push(parts.map(value => {
+            const floatValue = parseFloat(value);
+            if (Number.isNaN(floatValue)) {
+                return {error: `Invalid number '${value}' in: '${line}'`}
+            }
+            return floatValue;
+        }));
+    }
+
+    if (header === null || records.length < 2) {
+        return {error: "Invalid report"};
+    }
+
+    return {
+        meta: metadata,
+        header: header,
+        data: records,
+        stats: {
+            parseTime: `PT${((new Date() - start) / 1000)}S`
+        }
+    }
+};
+
+if (items.length === 0) {
+    items[0].json = {error: "No report file found in the request."};
+} else if (items.length > 1) {
+    items[0].json = {error: "More than one file found in the request."}
+} else {
+    const data = items[0].binary.file.data;
+    const text = Buffer.from(data, "base64").toString("utf8");
+    items[0].json = parseReport(text)
+}
+
+// noinspection JSAnnotator
+return items;