feat: add translated PDF export with layout preservation
Adds the ability to download translated documents as PDF files while
preserving the original document layout. Key changes:
- Add apply_translations() function to merge translation JSON with UnifiedDocument
- Add generate_translated_pdf() method to PDFGeneratorService
- Add POST /api/v2/translate/{task_id}/pdf endpoint
- Add downloadTranslatedPdf() method and PDF button in frontend
- Add comprehensive unit tests (52 tests: merge, PDF generation, API endpoints)
- Archive add-translated-pdf-export proposal
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
egg
727
backend/tests/api/test_translate_pdf_api.py
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727
backend/tests/api/test_translate_pdf_api.py
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"""
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API integration tests for Translated PDF Download endpoint.
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Tests the POST /api/v2/translate/{task_id}/pdf endpoint for downloading
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translated PDFs with layout preservation.
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Note: These tests use extensive mocking to avoid importing heavy dependencies
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like PaddleOCR and PyTorch which aren't available in the test environment.
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"""
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import pytest
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import json
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import sys
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from pathlib import Path
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from unittest.mock import patch, MagicMock
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from datetime import datetime
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# Mock heavy dependencies before importing app modules
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sys.modules['paddleocr'] = MagicMock()
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sys.modules['paddlex'] = MagicMock()
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sys.modules['torch'] = MagicMock()
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sys.modules['modelscope'] = MagicMock()
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from fastapi.testclient import TestClient
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from fastapi import FastAPI, Depends, HTTPException, status, Query
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from fastapi.responses import FileResponse
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from sqlalchemy import create_engine, Column, Integer, String, Boolean, Enum as SQLEnum
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from sqlalchemy.orm import sessionmaker, declarative_base
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import enum
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# Create test models without importing from app
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Base = declarative_base()
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class TaskStatusEnum(enum.Enum):
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PENDING = "pending"
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PROCESSING = "processing"
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COMPLETED = "completed"
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FAILED = "failed"
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class MockUser(Base):
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__tablename__ = "users"
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id = Column(Integer, primary_key=True, index=True)
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email = Column(String, unique=True, index=True)
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hashed_password = Column(String)
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is_active = Column(Boolean, default=True)
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class MockTask(Base):
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__tablename__ = "tasks"
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id = Column(Integer, primary_key=True, index=True)
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user_id = Column(Integer)
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task_id = Column(String, unique=True, index=True)
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filename = Column(String)
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status = Column(SQLEnum(TaskStatusEnum), default=TaskStatusEnum.PENDING)
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result_json_path = Column(String, nullable=True)
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file_path = Column(String, nullable=True)
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# Create test database
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SQLALCHEMY_DATABASE_URL = "sqlite:///./test_translate_pdf.db"
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engine = create_engine(SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False})
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TestingSessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
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def create_test_app():
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"""Create a minimal FastAPI app for testing the translate PDF endpoint"""
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test_app = FastAPI()
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@test_app.post("/api/v2/translate/{task_id}/pdf")
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async def download_translated_pdf(
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task_id: str,
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lang: str = Query(..., description="Target language code"),
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):
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"""Mock implementation of the translated PDF endpoint"""
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from app.services.pdf_generator_service import pdf_generator_service
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# Get db_session and current_user from app state (set in test)
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db = test_app.state.db_session
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current_user = test_app.state.current_user
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# Find task
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task = db.query(MockTask).filter(
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MockTask.task_id == task_id,
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MockTask.user_id == current_user.id
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).first()
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if not task:
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raise HTTPException(
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status_code=status.HTTP_404_NOT_FOUND,
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detail="Task not found"
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)
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if not task.result_json_path:
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raise HTTPException(
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status_code=status.HTTP_404_NOT_FOUND,
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detail="OCR result not found"
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)
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result_json_path = Path(task.result_json_path)
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if not result_json_path.exists():
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raise HTTPException(
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status_code=status.HTTP_404_NOT_FOUND,
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detail="Result file not found"
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)
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# Find translation file
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result_dir = result_json_path.parent
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base_name = result_json_path.stem.replace('_result', '').replace('edit_', '')
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translation_file = result_dir / f"{base_name}_translated_{lang}.json"
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if not translation_file.exists():
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translation_file = result_dir / f"edit_translated_{lang}.json"
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if not translation_file.exists():
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# List available translations
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available = [f.stem.split("_translated_")[-1]
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for f in result_dir.glob("*_translated_*.json")]
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if available:
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raise HTTPException(
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status_code=status.HTTP_404_NOT_FOUND,
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detail=f"Translation for language '{lang}' not found. Available translations: {', '.join(available)}"
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)
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else:
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raise HTTPException(
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status_code=status.HTTP_404_NOT_FOUND,
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detail="No translations found for this task."
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)
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# Check translation content
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try:
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with open(translation_file, 'r', encoding='utf-8') as f:
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translation_data = json.load(f)
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if not translation_data.get('translations'):
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raise HTTPException(
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status_code=status.HTTP_400_BAD_REQUEST,
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detail="Translation file is empty or incomplete"
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)
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except json.JSONDecodeError:
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raise HTTPException(
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status_code=status.HTTP_400_BAD_REQUEST,
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detail="Invalid translation file format"
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)
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# Generate PDF
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import tempfile
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output_filename = f"{task_id}_translated_{lang}.pdf"
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with tempfile.NamedTemporaryFile(suffix='.pdf', delete=False) as tmp_file:
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output_path = Path(tmp_file.name)
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try:
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source_file_path = None
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if task.file_path and Path(task.file_path).exists():
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source_file_path = Path(task.file_path)
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success = pdf_generator_service.generate_translated_pdf(
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result_json_path=result_json_path,
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translation_json_path=translation_file,
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output_path=output_path,
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source_file_path=source_file_path
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)
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if not success:
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raise HTTPException(
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status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
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detail="Failed to generate translated PDF"
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)
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return FileResponse(
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path=str(output_path),
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filename=output_filename,
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media_type="application/pdf",
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headers={
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"Content-Disposition": f'attachment; filename="{output_filename}"'
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}
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)
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except HTTPException:
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if output_path.exists():
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output_path.unlink()
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raise
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except Exception as e:
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if output_path.exists():
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output_path.unlink()
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raise HTTPException(
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status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
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detail=f"Failed to generate translated PDF: {str(e)}"
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)
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return test_app
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@pytest.fixture(scope="function")
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def db_session():
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"""Create test database session"""
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Base.metadata.create_all(bind=engine)
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session = TestingSessionLocal()
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try:
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yield session
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finally:
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session.close()
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Base.metadata.drop_all(bind=engine)
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@pytest.fixture
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def test_user(db_session):
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"""Create test user"""
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user = MockUser(
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email="translate_test@example.com",
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hashed_password="test_hash",
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is_active=True
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)
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db_session.add(user)
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db_session.commit()
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db_session.refresh(user)
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return user
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@pytest.fixture
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def test_app(db_session, test_user):
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"""Create test app with dependencies injected"""
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app = create_test_app()
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app.state.db_session = db_session
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app.state.current_user = test_user
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return app
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@pytest.fixture
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def client(test_app):
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"""Create test client"""
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return TestClient(test_app)
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@pytest.fixture
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def test_task_with_result(db_session, test_user, tmp_path):
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"""Create test task with result JSON and translation file"""
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task_id = "test-translate-pdf-123"
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result_dir = tmp_path / "results" / task_id
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result_dir.mkdir(parents=True)
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# Create result JSON
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result_json = {
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"document_info": {
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"total_pages": 1,
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"processing_track": "Direct"
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},
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"pages": [
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{
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"page_number": 1,
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"width": 612,
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"height": 792,
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"elements": [
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{
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"element_id": "text_1",
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"type": "text",
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"content": "Hello World",
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"bounding_box": {"x": 72, "y": 72, "width": 200, "height": 20}
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}
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]
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}
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]
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}
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result_json_path = result_dir / "edit_result.json"
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result_json_path.write_text(json.dumps(result_json), encoding='utf-8')
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# Create translation file
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translation_json = {
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"task_id": task_id,
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"target_lang": "zh-TW",
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"translated_at": datetime.utcnow().isoformat() + "Z",
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"provider": "dify",
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"translations": {
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"text_1": "你好世界"
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},
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"statistics": {
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"total_elements": 1,
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"translated_elements": 1,
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"skipped_elements": 0,
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"total_characters": 11,
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"processing_time_seconds": 1.5,
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"total_tokens": 50
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}
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}
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translation_path = result_dir / "edit_translated_zh-TW.json"
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translation_path.write_text(json.dumps(translation_json), encoding='utf-8')
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# Create task
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task = MockTask(
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user_id=test_user.id,
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task_id=task_id,
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filename="test.pdf",
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status=TaskStatusEnum.COMPLETED,
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result_json_path=str(result_json_path),
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file_path=str(tmp_path / "test.pdf")
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)
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db_session.add(task)
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db_session.commit()
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db_session.refresh(task)
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return task, result_dir
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@pytest.fixture
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def test_task_no_result(db_session, test_user):
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"""Create test task without result JSON"""
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task = MockTask(
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user_id=test_user.id,
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task_id="test-no-result-456",
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filename="test.pdf",
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status=TaskStatusEnum.COMPLETED,
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result_json_path=None
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)
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db_session.add(task)
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db_session.commit()
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db_session.refresh(task)
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return task
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@pytest.fixture
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def test_task_no_translation(db_session, test_user, tmp_path):
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"""Create test task with result JSON but no translation"""
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task_id = "test-no-translation-789"
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result_dir = tmp_path / "results" / task_id
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result_dir.mkdir(parents=True)
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# Create result JSON only (no translation file)
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result_json = {
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"document_info": {"total_pages": 1, "processing_track": "Direct"},
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"pages": [{"page_number": 1, "width": 612, "height": 792, "elements": []}]
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}
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result_json_path = result_dir / "edit_result.json"
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result_json_path.write_text(json.dumps(result_json), encoding='utf-8')
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task = MockTask(
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user_id=test_user.id,
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task_id=task_id,
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filename="test.pdf",
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status=TaskStatusEnum.COMPLETED,
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result_json_path=str(result_json_path)
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)
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db_session.add(task)
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db_session.commit()
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db_session.refresh(task)
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return task
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@pytest.fixture
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def test_task_empty_translation(db_session, test_user, tmp_path):
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"""Create test task with empty translation file"""
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task_id = "test-empty-translation-101"
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result_dir = tmp_path / "results" / task_id
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result_dir.mkdir(parents=True)
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# Create result JSON
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result_json = {
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"document_info": {"total_pages": 1, "processing_track": "Direct"},
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"pages": [{"page_number": 1, "width": 612, "height": 792, "elements": []}]
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}
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result_json_path = result_dir / "edit_result.json"
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result_json_path.write_text(json.dumps(result_json), encoding='utf-8')
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# Create empty translation file
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translation_json = {
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"task_id": task_id,
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"target_lang": "ja",
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"translations": {} # Empty translations
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}
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translation_path = result_dir / "edit_translated_ja.json"
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translation_path.write_text(json.dumps(translation_json), encoding='utf-8')
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task = MockTask(
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user_id=test_user.id,
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task_id=task_id,
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filename="test.pdf",
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status=TaskStatusEnum.COMPLETED,
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result_json_path=str(result_json_path)
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)
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db_session.add(task)
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db_session.commit()
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db_session.refresh(task)
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return task
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@pytest.fixture
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def other_user(db_session):
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"""Create another user for ownership tests"""
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user = MockUser(
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email="other_user@example.com",
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hashed_password="other_hash",
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is_active=True
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)
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db_session.add(user)
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db_session.commit()
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db_session.refresh(user)
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return user
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class TestTranslatedPDFDownload:
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"""Tests for POST /api/v2/translate/{task_id}/pdf endpoint"""
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@patch('app.services.pdf_generator_service.pdf_generator_service')
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def test_download_translated_pdf_success(
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self, mock_pdf_service, client, db_session, test_user, test_task_with_result, tmp_path
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):
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"""Test successful translated PDF download"""
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task, result_dir = test_task_with_result
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# Create a mock PDF file for the response
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mock_pdf_path = tmp_path / "output.pdf"
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mock_pdf_path.write_bytes(b"%PDF-1.4 mock pdf content")
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def mock_generate(result_json_path, translation_json_path, output_path, source_file_path=None):
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# Copy mock PDF to output path
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output_path.write_bytes(mock_pdf_path.read_bytes())
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return True
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mock_pdf_service.generate_translated_pdf.side_effect = mock_generate
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response = client.post(
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f"/api/v2/translate/{task.task_id}/pdf?lang=zh-TW"
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)
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assert response.status_code == 200
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assert response.headers["content-type"] == "application/pdf"
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assert "attachment" in response.headers.get("content-disposition", "")
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assert task.task_id in response.headers.get("content-disposition", "")
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# Verify PDF service was called
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mock_pdf_service.generate_translated_pdf.assert_called_once()
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def test_download_pdf_task_not_found(self, client, db_session, test_user):
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"""Test 404 when task doesn't exist"""
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response = client.post(
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"/api/v2/translate/nonexistent-task-id/pdf?lang=zh-TW"
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)
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assert response.status_code == 404
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assert "Task not found" in response.json()["detail"]
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def test_download_pdf_no_result_json(self, client, db_session, test_user, test_task_no_result):
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"""Test 404 when task has no result JSON"""
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response = client.post(
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f"/api/v2/translate/{test_task_no_result.task_id}/pdf?lang=zh-TW"
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)
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assert response.status_code == 404
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assert "OCR result not found" in response.json()["detail"]
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def test_download_pdf_translation_not_found(
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self, client, db_session, test_user, test_task_no_translation
|
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):
|
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"""Test 404 when translation for requested language doesn't exist"""
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response = client.post(
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f"/api/v2/translate/{test_task_no_translation.task_id}/pdf?lang=ko"
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)
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assert response.status_code == 404
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detail = response.json()["detail"]
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# Message could mention the language or indicate no translations found
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assert "ko" in detail or "translation" in detail.lower() or "found" in detail.lower()
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def test_download_pdf_empty_translation(
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self, client, db_session, test_user, test_task_empty_translation
|
||||
):
|
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"""Test 400 when translation file is empty"""
|
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response = client.post(
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f"/api/v2/translate/{test_task_empty_translation.task_id}/pdf?lang=ja"
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||||
)
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||||
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assert response.status_code == 400
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assert "empty" in response.json()["detail"].lower() or "incomplete" in response.json()["detail"].lower()
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||||
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||||
def test_download_pdf_missing_lang_param(
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||||
self, client, db_session, test_user, test_task_with_result
|
||||
):
|
||||
"""Test 422 when lang query parameter is missing"""
|
||||
task, _ = test_task_with_result
|
||||
|
||||
response = client.post(
|
||||
f"/api/v2/translate/{task.task_id}/pdf"
|
||||
)
|
||||
|
||||
# FastAPI returns 422 for missing required query params
|
||||
assert response.status_code == 422
|
||||
|
||||
def test_download_pdf_wrong_user(
|
||||
self, db_session, other_user, test_task_with_result, tmp_path
|
||||
):
|
||||
"""Test 404 when task belongs to different user"""
|
||||
task, _ = test_task_with_result
|
||||
|
||||
# Create new app with other_user
|
||||
app = create_test_app()
|
||||
app.state.db_session = db_session
|
||||
app.state.current_user = other_user
|
||||
client = TestClient(app)
|
||||
|
||||
response = client.post(
|
||||
f"/api/v2/translate/{task.task_id}/pdf?lang=zh-TW"
|
||||
)
|
||||
|
||||
# Task service returns None for tasks not owned by current user
|
||||
assert response.status_code == 404
|
||||
assert "Task not found" in response.json()["detail"]
|
||||
|
||||
@patch('app.services.pdf_generator_service.pdf_generator_service')
|
||||
def test_download_pdf_generation_failure(
|
||||
self, mock_pdf_service, client, db_session, test_user, test_task_with_result
|
||||
):
|
||||
"""Test 500 when PDF generation fails"""
|
||||
task, _ = test_task_with_result
|
||||
|
||||
# Mock PDF generation failure
|
||||
mock_pdf_service.generate_translated_pdf.return_value = False
|
||||
|
||||
response = client.post(
|
||||
f"/api/v2/translate/{task.task_id}/pdf?lang=zh-TW"
|
||||
)
|
||||
|
||||
assert response.status_code == 500
|
||||
assert "Failed to generate" in response.json()["detail"]
|
||||
|
||||
@patch('app.services.pdf_generator_service.pdf_generator_service')
|
||||
def test_download_pdf_exception_handling(
|
||||
self, mock_pdf_service, client, db_session, test_user, test_task_with_result
|
||||
):
|
||||
"""Test 500 when PDF generation raises exception"""
|
||||
task, _ = test_task_with_result
|
||||
|
||||
# Mock PDF generation exception
|
||||
mock_pdf_service.generate_translated_pdf.side_effect = Exception("Unexpected error")
|
||||
|
||||
response = client.post(
|
||||
f"/api/v2/translate/{task.task_id}/pdf?lang=zh-TW"
|
||||
)
|
||||
|
||||
assert response.status_code == 500
|
||||
assert "Failed to generate" in response.json()["detail"]
|
||||
|
||||
|
||||
class TestTranslatedPDFWithMultipleLanguages:
|
||||
"""Tests for multiple translation languages"""
|
||||
|
||||
@pytest.fixture
|
||||
def task_with_multiple_translations(self, db_session, test_user, tmp_path):
|
||||
"""Create task with translations in multiple languages"""
|
||||
task_id = "test-multi-lang-222"
|
||||
result_dir = tmp_path / "results" / task_id
|
||||
result_dir.mkdir(parents=True)
|
||||
|
||||
# Create result JSON
|
||||
result_json = {
|
||||
"document_info": {"total_pages": 1, "processing_track": "Direct"},
|
||||
"pages": [{
|
||||
"page_number": 1,
|
||||
"width": 612, "height": 792,
|
||||
"elements": [
|
||||
{"element_id": "text_1", "type": "text", "content": "Hello",
|
||||
"bounding_box": {"x": 72, "y": 72, "width": 100, "height": 20}}
|
||||
]
|
||||
}]
|
||||
}
|
||||
result_json_path = result_dir / "edit_result.json"
|
||||
result_json_path.write_text(json.dumps(result_json), encoding='utf-8')
|
||||
|
||||
# Create translations for multiple languages
|
||||
for lang, translation in [("zh-TW", "你好"), ("ja", "こんにちは"), ("ko", "안녕하세요")]:
|
||||
translation_json = {
|
||||
"task_id": task_id,
|
||||
"target_lang": lang,
|
||||
"translated_at": datetime.utcnow().isoformat() + "Z",
|
||||
"translations": {"text_1": translation},
|
||||
"statistics": {"translated_elements": 1}
|
||||
}
|
||||
(result_dir / f"edit_translated_{lang}.json").write_text(
|
||||
json.dumps(translation_json), encoding='utf-8'
|
||||
)
|
||||
|
||||
task = MockTask(
|
||||
user_id=test_user.id,
|
||||
task_id=task_id,
|
||||
filename="test.pdf",
|
||||
status=TaskStatusEnum.COMPLETED,
|
||||
result_json_path=str(result_json_path)
|
||||
)
|
||||
db_session.add(task)
|
||||
db_session.commit()
|
||||
db_session.refresh(task)
|
||||
|
||||
return task, result_dir
|
||||
|
||||
@patch('app.services.pdf_generator_service.pdf_generator_service')
|
||||
def test_download_different_languages(
|
||||
self, mock_pdf_service, client, db_session, test_user,
|
||||
task_with_multiple_translations, tmp_path
|
||||
):
|
||||
"""Test downloading PDFs for different languages"""
|
||||
task, result_dir = task_with_multiple_translations
|
||||
|
||||
mock_pdf_path = tmp_path / "output.pdf"
|
||||
mock_pdf_path.write_bytes(b"%PDF-1.4 mock")
|
||||
|
||||
def mock_generate(result_json_path, translation_json_path, output_path, source_file_path=None):
|
||||
output_path.write_bytes(mock_pdf_path.read_bytes())
|
||||
return True
|
||||
|
||||
mock_pdf_service.generate_translated_pdf.side_effect = mock_generate
|
||||
|
||||
for lang in ["zh-TW", "ja", "ko"]:
|
||||
response = client.post(
|
||||
f"/api/v2/translate/{task.task_id}/pdf?lang={lang}"
|
||||
)
|
||||
|
||||
assert response.status_code == 200, f"Failed for language {lang}"
|
||||
assert response.headers["content-type"] == "application/pdf"
|
||||
|
||||
# Verify PDF service was called 3 times
|
||||
assert mock_pdf_service.generate_translated_pdf.call_count == 3
|
||||
|
||||
def test_download_nonexistent_language(
|
||||
self, client, db_session, test_user, task_with_multiple_translations
|
||||
):
|
||||
"""Test 404 for language that doesn't exist"""
|
||||
task, _ = task_with_multiple_translations
|
||||
|
||||
response = client.post(
|
||||
f"/api/v2/translate/{task.task_id}/pdf?lang=de"
|
||||
)
|
||||
|
||||
assert response.status_code == 404
|
||||
detail = response.json()["detail"]
|
||||
# Should mention available languages
|
||||
assert "zh-TW" in detail or "ja" in detail or "ko" in detail or "not found" in detail.lower()
|
||||
|
||||
|
||||
class TestInvalidTranslationFile:
|
||||
"""Tests for invalid translation file scenarios"""
|
||||
|
||||
@pytest.fixture
|
||||
def task_with_invalid_json(self, db_session, test_user, tmp_path):
|
||||
"""Create task with invalid JSON translation file"""
|
||||
task_id = "test-invalid-json-333"
|
||||
result_dir = tmp_path / "results" / task_id
|
||||
result_dir.mkdir(parents=True)
|
||||
|
||||
# Create result JSON
|
||||
result_json = {
|
||||
"document_info": {"total_pages": 1, "processing_track": "Direct"},
|
||||
"pages": [{"page_number": 1, "width": 612, "height": 792, "elements": []}]
|
||||
}
|
||||
result_json_path = result_dir / "edit_result.json"
|
||||
result_json_path.write_text(json.dumps(result_json), encoding='utf-8')
|
||||
|
||||
# Create invalid JSON translation file
|
||||
(result_dir / "edit_translated_en.json").write_text("{ invalid json }", encoding='utf-8')
|
||||
|
||||
task = MockTask(
|
||||
user_id=test_user.id,
|
||||
task_id=task_id,
|
||||
filename="test.pdf",
|
||||
status=TaskStatusEnum.COMPLETED,
|
||||
result_json_path=str(result_json_path)
|
||||
)
|
||||
db_session.add(task)
|
||||
db_session.commit()
|
||||
db_session.refresh(task)
|
||||
|
||||
return task
|
||||
|
||||
def test_download_pdf_invalid_json(
|
||||
self, client, db_session, test_user, task_with_invalid_json
|
||||
):
|
||||
"""Test 400 when translation file has invalid JSON"""
|
||||
response = client.post(
|
||||
f"/api/v2/translate/{task_with_invalid_json.task_id}/pdf?lang=en"
|
||||
)
|
||||
|
||||
assert response.status_code == 400
|
||||
assert "Invalid" in response.json()["detail"] or "format" in response.json()["detail"].lower()
|
||||
|
||||
|
||||
class TestResultFileNotFound:
|
||||
"""Tests for missing result file scenario"""
|
||||
|
||||
@pytest.fixture
|
||||
def task_with_missing_file(self, db_session, test_user, tmp_path):
|
||||
"""Create task pointing to non-existent result file"""
|
||||
task_id = "test-missing-file-444"
|
||||
result_dir = tmp_path / "results" / task_id
|
||||
result_dir.mkdir(parents=True)
|
||||
|
||||
# Point to non-existent file
|
||||
result_json_path = result_dir / "nonexistent_result.json"
|
||||
|
||||
task = MockTask(
|
||||
user_id=test_user.id,
|
||||
task_id=task_id,
|
||||
filename="test.pdf",
|
||||
status=TaskStatusEnum.COMPLETED,
|
||||
result_json_path=str(result_json_path)
|
||||
)
|
||||
db_session.add(task)
|
||||
db_session.commit()
|
||||
db_session.refresh(task)
|
||||
|
||||
return task
|
||||
|
||||
def test_download_pdf_result_file_missing(
|
||||
self, client, db_session, test_user, task_with_missing_file
|
||||
):
|
||||
"""Test 404 when result file doesn't exist on disk"""
|
||||
response = client.post(
|
||||
f"/api/v2/translate/{task_with_missing_file.task_id}/pdf?lang=zh-TW"
|
||||
)
|
||||
|
||||
assert response.status_code == 404
|
||||
assert "not found" in response.json()["detail"].lower()
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
pytest.main([__file__, '-v'])
|
||||
Reference in New Issue
Block a user