@@ -0,0 +1,127 @@
+package sqlite
+
+import (
+	"database/sql"
+	"io"
+	"strings"
+	"time"
+
+	"gitlab.com/tozd/go/errors"
+	"go.alanpearce.eu/website/internal/buffer"
+	"go.alanpearce.eu/website/internal/storage"
+	"go.alanpearce.eu/x/log"
+)
+
+type Reader struct {
+	db      *sql.DB
+	log     *log.Logger
+	queries struct {
+		getFile   *sql.Stmt
+		checkPath *sql.Stmt
+	}
+}
+
+func NewReader(db *sql.DB, log *log.Logger) (r *Reader, err error) {
+	r = &Reader{
+		log: log,
+		db:  db,
+	}
+	r.queries.getFile, err = r.db.Prepare(`
+		SELECT
+			file.content_type,
+			file.last_modified,
+			file.etag,
+			content.encoding,
+			content.body
+		FROM url
+		INNER JOIN file
+			USING (url_id)
+		INNER JOIN content
+			USING (file_id)
+		WHERE
+			url.path = ?
+	`)
+	if err != nil {
+		return nil, errors.WithMessage(err, "preparing select statement")
+	}
+
+	r.queries.checkPath, err = r.db.Prepare(`
+		SELECT EXISTS(
+			SELECT 1
+			FROM url
+			WHERE path = ?
+		) AS differs
+`)
+	if err != nil {
+		return nil, errors.WithMessage(err, "preparing check path statement")
+	}
+
+	return r, nil
+}
+
+func (r *Reader) GetFile(filename string) (*storage.File, error) {
+	file := &storage.File{
+		Encodings: make(map[string]io.ReadSeeker, 1),
+	}
+	var unixTime int64
+	var encoding string
+	var content []byte
+	rows, err := r.queries.getFile.Query(filename)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil
+		}
+
+		return nil, errors.WithMessage(err, "querying database")
+	}
+
+	for rows.Next() {
+		err = rows.Scan(
+			&file.ContentType,
+			&unixTime,
+			&file.Etag,
+			&encoding,
+			&content,
+		)
+		if err != nil {
+			if err == sql.ErrNoRows {
+				return nil, nil
+			}
+
+			return nil, errors.WithMessage(err, "querying database")
+		}
+
+		file.LastModified = time.Unix(unixTime, 0)
+		file.Encodings[encoding] = buffer.NewBuffer(content)
+	}
+
+	return file, nil
+}
+
+func (r *Reader) CanonicalisePath(path string) (cPath string, differs bool) {
+	cPath = path
+	switch {
+	case path == "/":
+		differs = false
+	case strings.HasSuffix(path, "/index.html"):
+		cPath, differs = strings.CutSuffix(path, "index.html")
+	case !strings.HasSuffix(path, "/"):
+		cPath += "/"
+		err := r.queries.checkPath.QueryRow(cPath).Scan(&differs)
+		if err != nil {
+			r.log.Warn("error canonicalising path", "path", path, "error", err)
+
+			return
+		}
+	case strings.HasSuffix(path, "/"):
+		cPath = strings.TrimSuffix(path, "/")
+		err := r.queries.checkPath.QueryRow(cPath).Scan(&differs)
+		if err != nil {
+			r.log.Warn("error canonicalising path", "path", path, "error", err)
+
+			return
+		}
+	}
+
+	return
+}