feat: add file upload for materials (PDF/DOCX) with ingestion pipeline

internal/ingestion/ingestion.go

@@ -0,0 +1,75 @@
+package ingestion
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+type Result struct {
+	Title  string
+	Body   string
+	Format string
+}
+
+var parsers = map[string]func(string) (string, error){
+	".md":       ParseMarkdown,
+	".markdown": ParseMarkdown,
+	".pdf":      ParsePDF,
+	".docx":     ParseDOCX,
+}
+
+func ParseFile(path string) (Result, error) {
+	ext := strings.ToLower(filepath.Ext(path))
+	parse, ok := parsers[ext]
+	if !ok {
+		return Result{}, fmt.Errorf("unsupported file format: %s", ext)
+	}
+
+	body, err := parse(path)
+	if err != nil {
+		return Result{}, fmt.Errorf("parse %s: %w", ext, err)
+	}
+
+	title := strings.TrimSuffix(filepath.Base(path), ext)
+	return Result{
+		Title:  title,
+		Body:   strings.TrimSpace(body),
+		Format: ext[1:],
+	}, nil
+}
+
+func IsSupported(path string) bool {
+	ext := strings.ToLower(filepath.Ext(path))
+	_, ok := parsers[ext]
+	return ok
+}
+
+func SupportedExtensions() []string {
+	exts := make([]string, 0, len(parsers))
+	for ext := range parsers {
+		exts = append(exts, ext)
+	}
+	return exts
+}
+
+func ParseFromBytes(filename string, data []byte) (Result, error) {
+	safe := filepath.Base(filename)
+	if safe == "." || safe == string(filepath.Separator) {
+		return Result{}, fmt.Errorf("invalid filename: %q", filename)
+	}
+
+	tmpDir, err := os.MkdirTemp("", "ingestion-*")
+	if err != nil {
+		return Result{}, fmt.Errorf("create temp dir: %w", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	tmpPath := filepath.Join(tmpDir, safe)
+	if err := os.WriteFile(tmpPath, data, 0644); err != nil {
+		return Result{}, fmt.Errorf("write temp file: %w", err)
+	}
+
+	return ParseFile(tmpPath)
+}