feat: file_save_disk, file_delete, file_serve, upload_parse, upload_handler, thumbnail_generate (issue 0014 fase 3)

functions/infra/upload_parse_test.go

@@ -0,0 +1,101 @@
+package infra
+
+import (
+	"bytes"
+	"io"
+	"mime/multipart"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+// buildMultipart construye un multipart body con los archivos dados (field, filename, contenido).
+func buildMultipart(t *testing.T, files []struct{ field, filename, content string }) (string, *bytes.Buffer) {
+	t.Helper()
+	var body bytes.Buffer
+	w := multipart.NewWriter(&body)
+	for _, f := range files {
+		part, err := w.CreateFormFile(f.field, f.filename)
+		if err != nil {
+			t.Fatalf("CreateFormFile: %v", err)
+		}
+		if _, err := part.Write([]byte(f.content)); err != nil {
+			t.Fatalf("Write part: %v", err)
+		}
+	}
+	if err := w.Close(); err != nil {
+		t.Fatalf("Close writer: %v", err)
+	}
+	return w.FormDataContentType(), &body
+}
+
+func newMultipartReq(t *testing.T, contentType string, body *bytes.Buffer) *http.Request {
+	t.Helper()
+	req := httptest.NewRequest("POST", "/upload", body)
+	req.Header.Set("Content-Type", contentType)
+	return req
+}
+
+func TestUploadParse(t *testing.T) {
+	t.Run("extrae un archivo del multipart", func(t *testing.T) {
+		ct, body := buildMultipart(t, []struct{ field, filename, content string }{
+			{"file", "a.txt", "hello"},
+		})
+		req := newMultipartReq(t, ct, body)
+
+		got, err := UploadParse(req, 1<<20)
+		if err != nil {
+			t.Fatalf("UploadParse: %v", err)
+		}
+		if len(got) != 1 {
+			t.Fatalf("got %d files, want 1", len(got))
+		}
+		if got[0].Filename != "a.txt" {
+			t.Errorf("got Filename %q", got[0].Filename)
+		}
+		if got[0].Size != 5 {
+			t.Errorf("got Size %d, want 5", got[0].Size)
+		}
+		buf, _ := io.ReadAll(got[0].Content)
+		if string(buf) != "hello" {
+			t.Errorf("got content %q, want hello", buf)
+		}
+	})
+
+	t.Run("extrae multiples archivos", func(t *testing.T) {
+		ct, body := buildMultipart(t, []struct{ field, filename, content string }{
+			{"a", "1.txt", "uno"},
+			{"b", "2.txt", "dos"},
+		})
+		req := newMultipartReq(t, ct, body)
+
+		got, err := UploadParse(req, 1<<20)
+		if err != nil {
+			t.Fatalf("UploadParse: %v", err)
+		}
+		if len(got) != 2 {
+			t.Fatalf("got %d files, want 2", len(got))
+		}
+	})
+
+	t.Run("rechaza content-type no multipart", func(t *testing.T) {
+		req := httptest.NewRequest("POST", "/upload", strings.NewReader("x"))
+		req.Header.Set("Content-Type", "application/json")
+		_, err := UploadParse(req, 1<<20)
+		if err == nil || !strings.Contains(err.Error(), "no es multipart") {
+			t.Errorf("got %v, want error de content-type", err)
+		}
+	})
+
+	t.Run("respeta maxSize", func(t *testing.T) {
+		ct, body := buildMultipart(t, []struct{ field, filename, content string }{
+			{"file", "big.bin", strings.Repeat("x", 1024)},
+		})
+		req := newMultipartReq(t, ct, body)
+		_, err := UploadParse(req, 100) // demasiado pequeno
+		if err == nil {
+			t.Errorf("got nil err, want max bytes error")
+		}
+	})
+}