Changes

rag-api/Services/TextExtractor.cs

@@ -0,0 +1,27 @@
+using System.Text;
+using Api.Services.Contracts;
+using UglyToad.PdfPig;
+
+namespace Api.Services;
+
+public sealed class TextExtractor : ITextExtractor
+{
+    public Task<string> ExtractPdfAsync(Stream stream, CancellationToken ct)
+    {
+        using var document = PdfDocument.Open(stream);
+        var builder = new StringBuilder();
+        foreach (var page in document.GetPages())
+        {
+            ct.ThrowIfCancellationRequested();
+            builder.AppendLine(page.Text);
+            builder.AppendLine();
+        }
+        return Task.FromResult(Normalize(builder.ToString()));
+    }
+
+    public string Normalize(string value)
+    {
+        if (string.IsNullOrWhiteSpace(value)) return string.Empty;
+        return string.Join(' ', value.Split((char[]?)null, StringSplitOptions.RemoveEmptyEntries)).Trim();
+    }
+}