Add OCR, Background Removal, and PDF Editor features with tests
- Implemented OCR functionality using pytesseract for image and PDF text extraction. - Added Background Removal service using rembg for image processing. - Developed PDF Editor service for applying text annotations to PDF files. - Created corresponding API routes for OCR, Background Removal, and PDF Editor. - Added frontend components for OCR and Background Removal tools. - Integrated feature flagging for new tools, ensuring they are disabled by default. - Implemented comprehensive unit tests for OCR service, PDF editor, and background removal. - Updated documentation to reflect new features and usage instructions. - Added translations for new features in English, Arabic, and French.
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backend/tests/test_ocr.py
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163
backend/tests/test_ocr.py
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"""Tests for OCR routes — /api/ocr/image, /api/ocr/pdf, /api/ocr/languages."""
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import io
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import json
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import os
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import tempfile
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from unittest.mock import MagicMock
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from tests.conftest import make_png_bytes, make_pdf_bytes
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# =========================================================================
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# Feature flag enforcement
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# =========================================================================
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class TestOcrFeatureFlag:
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def test_ocr_image_disabled_by_default(self, client):
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"""OCR image should return 403 when FEATURE_EDITOR is off."""
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data = {"file": (io.BytesIO(make_png_bytes()), "test.png")}
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response = client.post(
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"/api/ocr/image",
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data=data,
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content_type="multipart/form-data",
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)
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assert response.status_code == 403
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assert "not enabled" in response.get_json()["error"]
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def test_ocr_pdf_disabled_by_default(self, client):
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"""OCR PDF should return 403 when FEATURE_EDITOR is off."""
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data = {"file": (io.BytesIO(make_pdf_bytes()), "scan.pdf")}
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response = client.post(
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"/api/ocr/pdf",
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data=data,
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content_type="multipart/form-data",
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)
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assert response.status_code == 403
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def test_languages_always_available(self, client):
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"""GET /api/ocr/languages should work even when feature is disabled."""
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response = client.get("/api/ocr/languages")
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assert response.status_code == 200
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data = response.get_json()
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langs = data["languages"]
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assert "eng" in langs
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assert "ara" in langs
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assert "fra" in langs
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# =========================================================================
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# Validation
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# =========================================================================
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class TestOcrValidation:
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def test_ocr_image_no_file(self, client, app):
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"""Should return 400 when no file provided."""
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app.config["FEATURE_EDITOR"] = True
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response = client.post("/api/ocr/image")
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assert response.status_code == 400
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assert "No file" in response.get_json()["error"]
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def test_ocr_pdf_no_file(self, client, app):
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"""Should return 400 when no file provided."""
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app.config["FEATURE_EDITOR"] = True
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response = client.post("/api/ocr/pdf")
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assert response.status_code == 400
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assert "No file" in response.get_json()["error"]
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# =========================================================================
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# Success paths
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# =========================================================================
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class TestOcrSuccess:
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def test_ocr_image_success(self, client, app, monkeypatch):
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"""Should return 202 with task_id when valid image provided."""
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app.config["FEATURE_EDITOR"] = True
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mock_task = MagicMock()
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mock_task.id = "ocr-img-task-1"
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tmp_dir = tempfile.mkdtemp()
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save_path = os.path.join(tmp_dir, "mock.png")
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monkeypatch.setattr(
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"app.routes.ocr.validate_actor_file",
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lambda f, allowed_types, actor: ("test.png", "png"),
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)
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monkeypatch.setattr(
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"app.routes.ocr.generate_safe_path",
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lambda ext, folder_type: ("mock-id", save_path),
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)
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monkeypatch.setattr(
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"app.routes.ocr.ocr_image_task.delay",
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MagicMock(return_value=mock_task),
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)
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data = {"file": (io.BytesIO(make_png_bytes()), "test.png"), "lang": "eng"}
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response = client.post(
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"/api/ocr/image",
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data=data,
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content_type="multipart/form-data",
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)
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assert response.status_code == 202
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body = response.get_json()
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assert body["task_id"] == "ocr-img-task-1"
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def test_ocr_pdf_success(self, client, app, monkeypatch):
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"""Should return 202 with task_id when valid PDF provided."""
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app.config["FEATURE_EDITOR"] = True
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mock_task = MagicMock()
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mock_task.id = "ocr-pdf-task-1"
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tmp_dir = tempfile.mkdtemp()
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save_path = os.path.join(tmp_dir, "mock.pdf")
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monkeypatch.setattr(
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"app.routes.ocr.validate_actor_file",
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lambda f, allowed_types, actor: ("scan.pdf", "pdf"),
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)
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monkeypatch.setattr(
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"app.routes.ocr.generate_safe_path",
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lambda ext, folder_type: ("mock-id", save_path),
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)
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monkeypatch.setattr(
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"app.routes.ocr.ocr_pdf_task.delay",
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MagicMock(return_value=mock_task),
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)
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data = {"file": (io.BytesIO(make_pdf_bytes()), "scan.pdf"), "lang": "ara"}
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response = client.post(
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"/api/ocr/pdf",
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data=data,
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content_type="multipart/form-data",
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)
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assert response.status_code == 202
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body = response.get_json()
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assert body["task_id"] == "ocr-pdf-task-1"
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def test_ocr_image_invalid_lang_falls_back(self, client, app, monkeypatch):
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"""Invalid lang should fall back to 'eng' without error."""
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app.config["FEATURE_EDITOR"] = True
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mock_task = MagicMock()
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mock_task.id = "ocr-lang-task"
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tmp_dir = tempfile.mkdtemp()
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save_path = os.path.join(tmp_dir, "mock.png")
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monkeypatch.setattr(
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"app.routes.ocr.validate_actor_file",
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lambda f, allowed_types, actor: ("test.png", "png"),
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)
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monkeypatch.setattr(
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"app.routes.ocr.generate_safe_path",
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lambda ext, folder_type: ("mock-id", save_path),
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)
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mock_delay = MagicMock(return_value=mock_task)
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monkeypatch.setattr("app.routes.ocr.ocr_image_task.delay", mock_delay)
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data = {"file": (io.BytesIO(make_png_bytes()), "test.png"), "lang": "invalid"}
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response = client.post(
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"/api/ocr/image",
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data=data,
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content_type="multipart/form-data",
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)
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assert response.status_code == 202
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# Verify 'eng' was passed to the task
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call_args = mock_delay.call_args
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assert call_args[0][3] == "eng" # 4th positional arg is lang
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