dify/api/tests/unit_tests/controllers/files/test_image_preview.py

import types
from inspect import unwrap
from unittest.mock import patch

import pytest
from werkzeug.exceptions import NotFound

import controllers.files.image_preview as module


@pytest.fixture(autouse=True)
def mock_db():
    """
    Replace Flask-SQLAlchemy db with a plain object
    to avoid touching Flask app context entirely.
    """
    fake_db = types.SimpleNamespace(engine=object())
    module.db = fake_db


class DummyUploadFile:
    def __init__(self, mime_type="text/plain", size=10, name="test.txt", extension="txt"):
        self.mime_type = mime_type
        self.size = size
        self.name = name
        self.extension = extension


def fake_request(args: dict):
    """Return a fake request object (NOT a Flask LocalProxy)."""
    return types.SimpleNamespace(args=types.SimpleNamespace(to_dict=lambda flat=True: args))


class TestImagePreviewApi:
    @patch.object(module, "FileService")
    def test_success(self, mock_file_service):
        module.request = fake_request(
            {
                "timestamp": "123",
                "nonce": "abc",
                "sign": "sig",
            }
        )

        generator = iter([b"img"])
        mock_file_service.return_value.get_image_preview.return_value = (
            generator,
            "image/png",
        )

        api = module.ImagePreviewApi()
        get_fn = unwrap(api.get)

        response = get_fn("file-id")

        assert response.mimetype == "image/png"

    @patch.object(module, "FileService")
    def test_unsupported_file_type(self, mock_file_service):
        module.request = fake_request(
            {
                "timestamp": "123",
                "nonce": "abc",
                "sign": "sig",
            }
        )

        mock_file_service.return_value.get_image_preview.side_effect = (
            module.services.errors.file.UnsupportedFileTypeError()
        )

        api = module.ImagePreviewApi()
        get_fn = unwrap(api.get)

        with pytest.raises(module.UnsupportedFileTypeError):
            get_fn("file-id")


class TestFilePreviewApi:
    @patch.object(module, "enforce_download_for_html")
    @patch.object(module, "FileService")
    def test_inline_preview_uses_upload_file_mimetype(self, mock_file_service, mock_enforce):
        module.request = fake_request(
            {
                "timestamp": "123",
                "nonce": "abc",
                "sign": "sig",
                "as_attachment": False,
            }
        )

        generator = iter([b"data"])
        upload_file = DummyUploadFile(
            mime_type="application/pdf",
            size=100,
            name="doc.pdf",
            extension="pdf",
        )

        mock_file_service.return_value.get_file_generator_by_file_id.return_value = (
            generator,
            upload_file,
        )

        api = module.FilePreviewApi()
        get_fn = unwrap(api.get)

        response = get_fn("file-id")

        assert response.mimetype == "application/pdf"
        assert response.headers["Content-Type"] == "application/pdf"
        assert response.headers["Content-Length"] == "100"
        assert "Accept-Ranges" not in response.headers
        mock_enforce.assert_called_once()

    @pytest.mark.parametrize(
        ("mime_type", "name", "extension"),
        [
            ("Image/SVG+XML; charset=UTF-8", "image.png", "png"),
            ("image/png", "image.SVG", "png"),
            ("image/png", "image.png", ".SVG"),
        ],
        ids=("mime-type", "filename", "extension"),
    )
    @patch.object(module, "FileService")
    def test_svg_preview_forces_download(self, mock_file_service, mime_type, name, extension):
        module.request = fake_request(
            {
                "timestamp": "123",
                "nonce": "abc",
                "sign": "sig",
                "as_attachment": False,
            }
        )

        generator = iter([b"<svg></svg>"])
        upload_file = DummyUploadFile(
            mime_type=mime_type,
            size=11,
            name=name,
            extension=extension,
        )

        mock_file_service.return_value.get_file_generator_by_file_id.return_value = (
            generator,
            upload_file,
        )

        api = module.FilePreviewApi()
        get_fn = unwrap(api.get)

        response = get_fn("file-id")

        assert response.headers["Content-Disposition"].startswith("attachment")
        assert response.headers["Content-Type"] == "application/octet-stream"
        assert response.headers["X-Content-Type-Options"] == "nosniff"

    @patch.object(module, "FileService")
    def test_html_preview_still_forces_download(self, mock_file_service):
        module.request = fake_request(
            {
                "timestamp": "123",
                "nonce": "abc",
                "sign": "sig",
                "as_attachment": False,
            }
        )

        generator = iter([b"<script>alert(1)</script>"])
        upload_file = DummyUploadFile(
            mime_type="text/html",
            size=25,
            name="unsafe.html",
            extension="html",
        )

        mock_file_service.return_value.get_file_generator_by_file_id.return_value = (
            generator,
            upload_file,
        )

        api = module.FilePreviewApi()
        get_fn = unwrap(api.get)

        response = get_fn("file-id")

        assert response.headers["Content-Disposition"].startswith("attachment")
        assert response.headers["Content-Type"] == "application/octet-stream"
        assert response.headers["X-Content-Type-Options"] == "nosniff"

    @patch.object(module, "enforce_download_for_html")
    @patch.object(module, "FileService")
    def test_as_attachment(self, mock_file_service, mock_enforce):
        module.request = fake_request(
            {
                "timestamp": "123",
                "nonce": "abc",
                "sign": "sig",
                "as_attachment": True,
            }
        )

        generator = iter([b"data"])
        upload_file = DummyUploadFile(
            mime_type="application/pdf",
            name="doc.pdf",
            extension="pdf",
        )

        mock_file_service.return_value.get_file_generator_by_file_id.return_value = (
            generator,
            upload_file,
        )

        api = module.FilePreviewApi()
        get_fn = unwrap(api.get)

        response = get_fn("file-id")

        assert response.headers["Content-Disposition"].startswith("attachment")
        assert response.headers["Content-Type"] == "application/octet-stream"
        mock_enforce.assert_called_once()

    @patch.object(module, "FileService")
    def test_unsupported_file_type(self, mock_file_service):
        module.request = fake_request(
            {
                "timestamp": "123",
                "nonce": "abc",
                "sign": "sig",
                "as_attachment": False,
            }
        )

        mock_file_service.return_value.get_file_generator_by_file_id.side_effect = (
            module.services.errors.file.UnsupportedFileTypeError()
        )

        api = module.FilePreviewApi()
        get_fn = unwrap(api.get)

        with pytest.raises(module.UnsupportedFileTypeError):
            get_fn("file-id")


class TestWorkspaceWebappLogoApi:
    @patch.object(module, "FileService")
    @patch.object(module.TenantService, "get_custom_config")
    def test_success(self, mock_config, mock_file_service):
        mock_config.return_value = {"replace_webapp_logo": "logo-id"}
        generator = iter([b"logo"])

        mock_file_service.return_value.get_public_image_preview.return_value = (
            generator,
            "image/png",
        )

        api = module.WorkspaceWebappLogoApi()
        get_fn = unwrap(api.get)

        response = get_fn("workspace-id")

        assert response.mimetype == "image/png"

    @patch.object(module.TenantService, "get_custom_config")
    def test_logo_not_configured(self, mock_config):
        mock_config.return_value = {}

        api = module.WorkspaceWebappLogoApi()
        get_fn = unwrap(api.get)

        with pytest.raises(NotFound):
            get_fn("workspace-id")

    @patch.object(module, "FileService")
    @patch.object(module.TenantService, "get_custom_config")
    def test_unsupported_file_type(self, mock_config, mock_file_service):
        mock_config.return_value = {"replace_webapp_logo": "logo-id"}
        mock_file_service.return_value.get_public_image_preview.side_effect = (
            module.services.errors.file.UnsupportedFileTypeError()
        )

        api = module.WorkspaceWebappLogoApi()
        get_fn = unwrap(api.get)

        with pytest.raises(module.UnsupportedFileTypeError):
            get_fn("workspace-id")