From 8a8a1460e58ce0adfc45b82e05a0b68f314ecffc Mon Sep 17 00:00:00 2001
From: Sylvain Zimmer <sylvain@sylvainzimmer.com>
Date: Thu, 24 Jul 2025 02:31:50 +0200
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8(api)=20add=20API=20route=20to=20fetch?=
 =?UTF-8?q?=20document=20content?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This allows API users to process document content, enabling the
use of Docs as a headless CMS for instance, or any kind of document
processing. Fixes #1206.
---
 CHANGELOG.md                                  |   4 +
 docker/auth/realm.json                        |   2 +-
 src/backend/core/api/serializers.py           |   6 +-
 src/backend/core/api/viewsets.py              |  64 ++++++
 src/backend/core/models.py                    |   1 +
 .../core/services/converter_services.py       |  53 -----
 .../core/services/yprovider_services.py       |  80 +++++++
 .../documents/test_api_documents_content.py   | 161 ++++++++++++++
 .../test_api_documents_create_for_owner.py    |   6 +-
 .../documents/test_api_documents_retrieve.py  |   5 +
 .../documents/test_api_documents_trashbin.py  |   1 +
 .../core/tests/test_models_documents.py       |   8 +
 ...py => test_services_yprovider_services.py} |  82 +++++--
 .../y-provider/__tests__/content.test.ts      | 207 ++++++++++++++++++
 src/frontend/servers/y-provider/package.json  |   2 +-
 .../y-provider/src/handlers/contentHandler.ts |  71 ++++++
 .../servers/y-provider/src/handlers/index.ts  |   1 +
 src/frontend/servers/y-provider/src/routes.ts |   1 +
 .../y-provider/src/servers/appServer.ts       |   6 +
 19 files changed, 687 insertions(+), 74 deletions(-)
 delete mode 100644 src/backend/core/services/converter_services.py
 create mode 100644 src/backend/core/services/yprovider_services.py
 create mode 100644 src/backend/core/tests/documents/test_api_documents_content.py
 rename src/backend/core/tests/{test_services_converter_services.py => test_services_yprovider_services.py} (54%)
 create mode 100644 src/frontend/servers/y-provider/__tests__/content.test.ts
 create mode 100644 src/frontend/servers/y-provider/src/handlers/contentHandler.ts

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 51a2d78c..b8525204 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Added 
+
+- ✨(api) add API route to fetch document content #1206
+
 ### Changed
 
 - 🔒️(backend) configure throttle on every viewsets #1343
diff --git a/docker/auth/realm.json b/docker/auth/realm.json
index db5f1be0..06ab6e55 100644
--- a/docker/auth/realm.json
+++ b/docker/auth/realm.json
@@ -26,7 +26,7 @@
   "oauth2DeviceCodeLifespan": 600,
   "oauth2DevicePollingInterval": 5,
   "enabled": true,
-  "sslRequired": "external",
+  "sslRequired": "none",
   "registrationAllowed": true,
   "registrationEmailAsUsername": false,
   "rememberMe": true,
diff --git a/src/backend/core/api/serializers.py b/src/backend/core/api/serializers.py
index 9b843908..df06518d 100644
--- a/src/backend/core/api/serializers.py
+++ b/src/backend/core/api/serializers.py
@@ -15,9 +15,9 @@ from rest_framework import serializers
 
 from core import choices, enums, models, utils, validators
 from core.services.ai_services import AI_ACTIONS
-from core.services.converter_services import (
+from core.services.yprovider_services import (
     ConversionError,
-    YdocConverter,
+    YProviderAPI,
 )
 
 
@@ -451,7 +451,7 @@ class ServerCreateDocumentSerializer(serializers.Serializer):
             language = user.language or language
 
         try:
-            document_content = YdocConverter().convert(validated_data["content"])
+            document_content = YProviderAPI().convert(validated_data["content"])
         except ConversionError as err:
             raise serializers.ValidationError(
                 {"content": ["Could not convert content"]}
diff --git a/src/backend/core/api/viewsets.py b/src/backend/core/api/viewsets.py
index 19841185..58bf61c0 100644
--- a/src/backend/core/api/viewsets.py
+++ b/src/backend/core/api/viewsets.py
@@ -37,6 +37,15 @@ from rest_framework.permissions import AllowAny
 from core import authentication, choices, enums, models
 from core.services.ai_services import AIService
 from core.services.collaboration_services import CollaborationService
+from core.services.yprovider_services import (
+    ServiceUnavailableError as YProviderServiceUnavailableError,
+)
+from core.services.yprovider_services import (
+    ValidationError as YProviderValidationError,
+)
+from core.services.yprovider_services import (
+    YProviderAPI,
+)
 from core.tasks.mail import send_ask_for_access_mail
 from core.utils import extract_attachments, filter_descendants
 
@@ -1494,6 +1503,61 @@ class DocumentViewSet(
                 status=status.HTTP_400_BAD_REQUEST,
             )
 
+    @drf.decorators.action(
+        detail=True,
+        methods=["get"],
+        url_path="content",
+        name="Get document content in different formats",
+    )
+    def content(self, request, pk=None):
+        """
+        Retrieve document content in different formats (JSON, Markdown, HTML).
+
+        Query parameters:
+        - content_format: The desired output format (json, markdown, html)
+
+        Returns:
+            JSON response with content in the specified format.
+        """
+
+        document = self.get_object()
+
+        content_format = request.query_params.get("content_format", "json").lower()
+        if content_format not in {"json", "markdown", "html"}:
+            raise drf.exceptions.ValidationError(
+                "Invalid format. Must be one of: json, markdown, html"
+            )
+
+        # Get the base64 content from the document
+        content = None
+        base64_content = document.content
+        if base64_content is not None:
+            # Convert using the y-provider service
+            try:
+                yprovider = YProviderAPI()
+                result = yprovider.content(base64_content, content_format)
+                content = result["content"]
+            except YProviderValidationError as e:
+                return drf_response.Response(
+                    {"error": str(e)}, status=status.HTTP_400_BAD_REQUEST
+                )
+            except YProviderServiceUnavailableError as e:
+                logger.error("Error getting content for document %s: %s", pk, e)
+                return drf_response.Response(
+                    {"error": "Failed to get document content"},
+                    status=status.HTTP_500_INTERNAL_SERVER_ERROR,
+                )
+
+        return drf_response.Response(
+            {
+                "id": str(document.id),
+                "title": document.title,
+                "content": content,
+                "created_at": document.created_at,
+                "updated_at": document.updated_at,
+            }
+        )
+
 
 class DocumentAccessViewSet(
     ResourceAccessViewsetMixin,
diff --git a/src/backend/core/models.py b/src/backend/core/models.py
index 6ccca08d..9b8e13fe 100644
--- a/src/backend/core/models.py
+++ b/src/backend/core/models.py
@@ -783,6 +783,7 @@ class Document(MP_Node, BaseModel):
             "children_list": can_get,
             "children_create": can_create_children,
             "collaboration_auth": can_get,
+            "content": can_get,
             "cors_proxy": can_get,
             "descendants": can_get,
             "destroy": can_destroy,
diff --git a/src/backend/core/services/converter_services.py b/src/backend/core/services/converter_services.py
deleted file mode 100644
index d6a6dbf4..00000000
--- a/src/backend/core/services/converter_services.py
+++ /dev/null
@@ -1,53 +0,0 @@
-"""Converter services."""
-
-from base64 import b64encode
-
-from django.conf import settings
-
-import requests
-
-
-class ConversionError(Exception):
-    """Base exception for conversion-related errors."""
-
-
-class ValidationError(ConversionError):
-    """Raised when the input validation fails."""
-
-
-class ServiceUnavailableError(ConversionError):
-    """Raised when the conversion service is unavailable."""
-
-
-class YdocConverter:
-    """Service class for conversion-related operations."""
-
-    @property
-    def auth_header(self):
-        """Build microservice authentication header."""
-        # Note: Yprovider microservice accepts only raw token, which is not recommended
-        return f"Bearer {settings.Y_PROVIDER_API_KEY}"
-
-    def convert(self, text):
-        """Convert a Markdown text into our internal format using an external microservice."""
-
-        if not text:
-            raise ValidationError("Input text cannot be empty")
-
-        try:
-            response = requests.post(
-                f"{settings.Y_PROVIDER_API_BASE_URL}{settings.CONVERSION_API_ENDPOINT}/",
-                data=text,
-                headers={
-                    "Authorization": self.auth_header,
-                    "Content-Type": "text/markdown",
-                },
-                timeout=settings.CONVERSION_API_TIMEOUT,
-                verify=settings.CONVERSION_API_SECURE,
-            )
-            response.raise_for_status()
-            return b64encode(response.content).decode("utf-8")
-        except requests.RequestException as err:
-            raise ServiceUnavailableError(
-                "Failed to connect to conversion service",
-            ) from err
diff --git a/src/backend/core/services/yprovider_services.py b/src/backend/core/services/yprovider_services.py
new file mode 100644
index 00000000..09b80f8c
--- /dev/null
+++ b/src/backend/core/services/yprovider_services.py
@@ -0,0 +1,80 @@
+"""Y-Provider API services."""
+
+import json
+from base64 import b64encode
+
+from django.conf import settings
+
+import requests
+
+
+class ConversionError(Exception):
+    """Base exception for conversion-related errors."""
+
+
+class ValidationError(ConversionError):
+    """Raised when the input validation fails."""
+
+
+class ServiceUnavailableError(ConversionError):
+    """Raised when the conversion service is unavailable."""
+
+
+class YProviderAPI:
+    """Service class for Y-Provider API operations."""
+
+    @property
+    def auth_header(self):
+        """Build microservice authentication header."""
+        # Note: Yprovider microservice accepts only raw token, which is not recommended
+        return f"Bearer {settings.Y_PROVIDER_API_KEY}"
+
+    def _request(self, url, data, content_type):
+        """Make a request to the Y-Provider API."""
+        response = requests.post(
+            url,
+            data=data,
+            headers={
+                "Authorization": self.auth_header,
+                "Content-Type": content_type,
+            },
+            timeout=settings.CONVERSION_API_TIMEOUT,
+            verify=settings.CONVERSION_API_SECURE,
+        )
+        response.raise_for_status()
+        return response
+
+    def convert(self, text):
+        """Convert a Markdown text into our internal format using an external microservice."""
+
+        if not text:
+            raise ValidationError("Input text cannot be empty")
+
+        try:
+            response = self._request(
+                f"{settings.Y_PROVIDER_API_BASE_URL}{settings.CONVERSION_API_ENDPOINT}/",
+                text,
+                "text/markdown",
+            )
+            return b64encode(response.content).decode("utf-8")
+        except requests.RequestException as err:
+            raise ServiceUnavailableError(
+                "Failed to connect to backend service",
+            ) from err
+
+    def content(self, base64_content, format_type):
+        """Convert base64 Yjs content to different formats using the y-provider service."""
+
+        if not base64_content:
+            raise ValidationError("Input content cannot be empty")
+
+        data = json.dumps({"content": base64_content, "format": format_type})
+        try:
+            response = self._request(
+                f"{settings.Y_PROVIDER_API_BASE_URL}content/", data, "application/json"
+            )
+            return response.json()
+        except requests.RequestException as err:
+            raise ServiceUnavailableError(
+                "Failed to connect to backend service",
+            ) from err
diff --git a/src/backend/core/tests/documents/test_api_documents_content.py b/src/backend/core/tests/documents/test_api_documents_content.py
new file mode 100644
index 00000000..62b215c9
--- /dev/null
+++ b/src/backend/core/tests/documents/test_api_documents_content.py
@@ -0,0 +1,161 @@
+"""
+Tests for Documents API endpoint in impress's core app: content
+"""
+
+from unittest.mock import patch
+
+import pytest
+import requests
+from rest_framework import status
+from rest_framework.test import APIClient
+
+from core import factories
+
+pytestmark = pytest.mark.django_db
+
+
+@pytest.mark.parametrize(
+    "reach, role",
+    [
+        ("public", "reader"),
+        ("public", "editor"),
+    ],
+)
+@patch("core.services.yprovider_services.YProviderAPI.content")
+def test_api_documents_content_public(mock_content, reach, role):
+    """Anonymous users should be allowed to access content of public documents."""
+    document = factories.DocumentFactory(link_reach=reach, link_role=role)
+    mock_content.return_value = {"content": {"some": "data"}}
+
+    response = APIClient().get(f"/api/v1.0/documents/{document.id!s}/content/")
+
+    assert response.status_code == status.HTTP_200_OK
+    data = response.json()
+    assert data["id"] == str(document.id)
+    assert data["title"] == document.title
+    assert data["content"] == {"some": "data"}
+    mock_content.assert_called_once_with(document.content, "json")
+
+
+@pytest.mark.parametrize(
+    "reach, doc_role, user_role",
+    [
+        ("restricted", "reader", "reader"),
+        ("restricted", "reader", "editor"),
+        ("restricted", "reader", "administrator"),
+        ("restricted", "reader", "owner"),
+        ("restricted", "editor", "reader"),
+        ("restricted", "editor", "editor"),
+        ("restricted", "editor", "administrator"),
+        ("restricted", "editor", "owner"),
+        ("authenticated", "reader", None),
+        ("authenticated", "editor", None),
+    ],
+)
+@patch("core.services.yprovider_services.YProviderAPI.content")
+def test_api_documents_content_not_public(mock_content, reach, doc_role, user_role):
+    """Authenticated users need access to get non-public document content."""
+    user = factories.UserFactory()
+    document = factories.DocumentFactory(link_reach=reach, link_role=doc_role)
+    mock_content.return_value = {"content": {"some": "data"}}
+
+    # First anonymous request should fail
+    client = APIClient()
+    response = client.get(f"/api/v1.0/documents/{document.id!s}/content/")
+
+    assert response.status_code == status.HTTP_401_UNAUTHORIZED
+    mock_content.assert_not_called()
+
+    # Login and try again
+    client.force_login(user)
+    response = client.get(f"/api/v1.0/documents/{document.id!s}/content/")
+
+    # If restricted, we still should not have access
+    if user_role is not None:
+        assert response.status_code == status.HTTP_403_FORBIDDEN
+        mock_content.assert_not_called()
+
+        # Create an access as a reader. This should unlock the access.
+        factories.UserDocumentAccessFactory(
+            document=document, user=user, role=user_role
+        )
+
+        response = client.get(f"/api/v1.0/documents/{document.id!s}/content/")
+
+    assert response.status_code == status.HTTP_200_OK
+    data = response.json()
+    assert data["id"] == str(document.id)
+    assert data["title"] == document.title
+    assert data["content"] == {"some": "data"}
+    mock_content.assert_called_once_with(document.content, "json")
+
+
+@pytest.mark.parametrize(
+    "content_format",
+    ["markdown", "html", "json"],
+)
+@patch("core.services.yprovider_services.YProviderAPI.content")
+def test_api_documents_content_format(mock_content, content_format):
+    """Test that the content endpoint returns a specific format."""
+    document = factories.DocumentFactory(link_reach="public")
+    mock_content.return_value = {"content": "whatever"}
+
+    response = APIClient().get(
+        f"/api/v1.0/documents/{document.id!s}/content/?content_format={content_format}"
+    )
+
+    assert response.status_code == status.HTTP_200_OK
+    data = response.json()
+    assert data["id"] == str(document.id)
+    assert data["title"] == document.title
+    assert data["content"] == "whatever"
+    mock_content.assert_called_once_with(document.content, content_format)
+
+
+@patch("core.services.yprovider_services.YProviderAPI._request")
+def test_api_documents_content_invalid_format(mock_request):
+    """Test that the content endpoint rejects invalid formats."""
+    document = factories.DocumentFactory(link_reach="public")
+
+    response = APIClient().get(
+        f"/api/v1.0/documents/{document.id!s}/content/?content_format=invalid"
+    )
+    assert response.status_code == status.HTTP_400_BAD_REQUEST
+    mock_request.assert_not_called()
+
+
+@patch("core.services.yprovider_services.YProviderAPI._request")
+def test_api_documents_content_yservice_error(mock_request):
+    """Test that service errors are handled properly."""
+    document = factories.DocumentFactory(link_reach="public")
+    mock_request.side_effect = requests.RequestException()
+
+    response = APIClient().get(f"/api/v1.0/documents/{document.id!s}/content/")
+    mock_request.assert_called_once()
+    assert response.status_code == status.HTTP_500_INTERNAL_SERVER_ERROR
+
+
+@patch("core.services.yprovider_services.YProviderAPI._request")
+def test_api_documents_content_nonexistent_document(mock_request):
+    """Test that accessing a nonexistent document returns 404."""
+    client = APIClient()
+    response = client.get(
+        "/api/v1.0/documents/00000000-0000-0000-0000-000000000000/content/"
+    )
+    assert response.status_code == status.HTTP_404_NOT_FOUND
+    mock_request.assert_not_called()
+
+
+@patch("core.services.yprovider_services.YProviderAPI._request")
+def test_api_documents_content_empty_document(mock_request):
+    """Test that accessing an empty document returns empty content."""
+    document = factories.DocumentFactory(link_reach="public", content="")
+
+    response = APIClient().get(f"/api/v1.0/documents/{document.id!s}/content/")
+
+    assert response.status_code == status.HTTP_200_OK
+    data = response.json()
+    assert data["id"] == str(document.id)
+    assert data["title"] == document.title
+    assert data["content"] is None
+    mock_request.assert_not_called()
diff --git a/src/backend/core/tests/documents/test_api_documents_create_for_owner.py b/src/backend/core/tests/documents/test_api_documents_create_for_owner.py
index 346fe407..f011559b 100644
--- a/src/backend/core/tests/documents/test_api_documents_create_for_owner.py
+++ b/src/backend/core/tests/documents/test_api_documents_create_for_owner.py
@@ -16,16 +16,16 @@ from rest_framework.test import APIClient
 from core import factories
 from core.api.serializers import ServerCreateDocumentSerializer
 from core.models import Document, Invitation, User
-from core.services.converter_services import ConversionError, YdocConverter
+from core.services.yprovider_services import ConversionError, YProviderAPI
 
 pytestmark = pytest.mark.django_db
 
 
 @pytest.fixture
 def mock_convert_md():
-    """Mock YdocConverter.convert to return a converted content."""
+    """Mock YProviderAPI.convert to return a converted content."""
     with patch.object(
-        YdocConverter,
+        YProviderAPI,
         "convert",
         return_value="Converted document content",
     ) as mock:
diff --git a/src/backend/core/tests/documents/test_api_documents_retrieve.py b/src/backend/core/tests/documents/test_api_documents_retrieve.py
index 5b8b1403..d1f8e1f0 100644
--- a/src/backend/core/tests/documents/test_api_documents_retrieve.py
+++ b/src/backend/core/tests/documents/test_api_documents_retrieve.py
@@ -37,6 +37,7 @@ def test_api_documents_retrieve_anonymous_public_standalone():
             "children_list": True,
             "collaboration_auth": True,
             "cors_proxy": True,
+            "content": True,
             "descendants": True,
             "destroy": False,
             "duplicate": False,
@@ -113,6 +114,7 @@ def test_api_documents_retrieve_anonymous_public_parent():
             "collaboration_auth": True,
             "descendants": True,
             "cors_proxy": True,
+            "content": True,
             "destroy": False,
             "duplicate": False,
             # Anonymous user can't favorite a document even with read access
@@ -218,6 +220,7 @@ def test_api_documents_retrieve_authenticated_unrelated_public_or_authenticated(
             "collaboration_auth": True,
             "descendants": True,
             "cors_proxy": True,
+            "content": True,
             "destroy": False,
             "duplicate": True,
             "favorite": True,
@@ -300,6 +303,7 @@ def test_api_documents_retrieve_authenticated_public_or_authenticated_parent(rea
             "collaboration_auth": True,
             "descendants": True,
             "cors_proxy": True,
+            "content": True,
             "destroy": False,
             "duplicate": True,
             "favorite": True,
@@ -494,6 +498,7 @@ def test_api_documents_retrieve_authenticated_related_parent():
             "collaboration_auth": True,
             "descendants": True,
             "cors_proxy": True,
+            "content": True,
             "destroy": access.role in ["administrator", "owner"],
             "duplicate": True,
             "favorite": True,
diff --git a/src/backend/core/tests/documents/test_api_documents_trashbin.py b/src/backend/core/tests/documents/test_api_documents_trashbin.py
index 25bc1cda..28ea6a01 100644
--- a/src/backend/core/tests/documents/test_api_documents_trashbin.py
+++ b/src/backend/core/tests/documents/test_api_documents_trashbin.py
@@ -81,6 +81,7 @@ def test_api_documents_trashbin_format():
             "collaboration_auth": True,
             "descendants": True,
             "cors_proxy": True,
+            "content": True,
             "destroy": True,
             "duplicate": True,
             "favorite": True,
diff --git a/src/backend/core/tests/test_models_documents.py b/src/backend/core/tests/test_models_documents.py
index 58687092..cc760aff 100644
--- a/src/backend/core/tests/test_models_documents.py
+++ b/src/backend/core/tests/test_models_documents.py
@@ -161,6 +161,7 @@ def test_models_documents_get_abilities_forbidden(
         "collaboration_auth": False,
         "descendants": False,
         "cors_proxy": False,
+        "content": False,
         "destroy": False,
         "duplicate": False,
         "favorite": False,
@@ -224,6 +225,7 @@ def test_models_documents_get_abilities_reader(
         "collaboration_auth": True,
         "descendants": True,
         "cors_proxy": True,
+        "content": True,
         "destroy": False,
         "duplicate": is_authenticated,
         "favorite": is_authenticated,
@@ -289,6 +291,7 @@ def test_models_documents_get_abilities_editor(
         "collaboration_auth": True,
         "descendants": True,
         "cors_proxy": True,
+        "content": True,
         "destroy": False,
         "duplicate": is_authenticated,
         "favorite": is_authenticated,
@@ -343,6 +346,7 @@ def test_models_documents_get_abilities_owner(django_assert_num_queries):
         "collaboration_auth": True,
         "descendants": True,
         "cors_proxy": True,
+        "content": True,
         "destroy": True,
         "duplicate": True,
         "favorite": True,
@@ -394,6 +398,7 @@ def test_models_documents_get_abilities_administrator(django_assert_num_queries)
         "collaboration_auth": True,
         "descendants": True,
         "cors_proxy": True,
+        "content": True,
         "destroy": False,
         "duplicate": True,
         "favorite": True,
@@ -448,6 +453,7 @@ def test_models_documents_get_abilities_editor_user(django_assert_num_queries):
         "collaboration_auth": True,
         "descendants": True,
         "cors_proxy": True,
+        "content": True,
         "destroy": False,
         "duplicate": True,
         "favorite": True,
@@ -509,6 +515,7 @@ def test_models_documents_get_abilities_reader_user(
         "collaboration_auth": True,
         "descendants": True,
         "cors_proxy": True,
+        "content": True,
         "destroy": False,
         "duplicate": True,
         "favorite": True,
@@ -568,6 +575,7 @@ def test_models_documents_get_abilities_preset_role(django_assert_num_queries):
         "collaboration_auth": True,
         "descendants": True,
         "cors_proxy": True,
+        "content": True,
         "destroy": False,
         "duplicate": True,
         "favorite": True,
diff --git a/src/backend/core/tests/test_services_converter_services.py b/src/backend/core/tests/test_services_yprovider_services.py
similarity index 54%
rename from src/backend/core/tests/test_services_converter_services.py
rename to src/backend/core/tests/test_services_yprovider_services.py
index 01773f85..603c2207 100644
--- a/src/backend/core/tests/test_services_converter_services.py
+++ b/src/backend/core/tests/test_services_yprovider_services.py
@@ -1,28 +1,29 @@
-"""Test converter services."""
+"""Test y-provider services."""
 
+import json
 from base64 import b64decode
 from unittest.mock import MagicMock, patch
 
 import pytest
 import requests
 
-from core.services.converter_services import (
+from core.services.yprovider_services import (
     ServiceUnavailableError,
     ValidationError,
-    YdocConverter,
+    YProviderAPI,
 )
 
 
 def test_auth_header(settings):
     """Test authentication header generation."""
     settings.Y_PROVIDER_API_KEY = "test-key"
-    converter = YdocConverter()
+    converter = YProviderAPI()
     assert converter.auth_header == "Bearer test-key"
 
 
 def test_convert_empty_text():
     """Should raise ValidationError when text is empty."""
-    converter = YdocConverter()
+    converter = YProviderAPI()
     with pytest.raises(ValidationError, match="Input text cannot be empty"):
         converter.convert("")
 
@@ -30,13 +31,13 @@ def test_convert_empty_text():
 @patch("requests.post")
 def test_convert_service_unavailable(mock_post):
     """Should raise ServiceUnavailableError when service is unavailable."""
-    converter = YdocConverter()
+    converter = YProviderAPI()
 
     mock_post.side_effect = requests.RequestException("Connection error")
 
     with pytest.raises(
         ServiceUnavailableError,
-        match="Failed to connect to conversion service",
+        match="Failed to connect to backend service",
     ):
         converter.convert("test text")
 
@@ -44,7 +45,7 @@ def test_convert_service_unavailable(mock_post):
 @patch("requests.post")
 def test_convert_http_error(mock_post):
     """Should raise ServiceUnavailableError when HTTP error occurs."""
-    converter = YdocConverter()
+    converter = YProviderAPI()
 
     mock_response = MagicMock()
     mock_response.raise_for_status.side_effect = requests.HTTPError("HTTP Error")
@@ -52,7 +53,7 @@ def test_convert_http_error(mock_post):
 
     with pytest.raises(
         ServiceUnavailableError,
-        match="Failed to connect to conversion service",
+        match="Failed to connect to backend service",
     ):
         converter.convert("test text")
 
@@ -67,7 +68,7 @@ def test_convert_full_integration(mock_post, settings):
     settings.CONVERSION_API_TIMEOUT = 5
     settings.CONVERSION_API_CONTENT_FIELD = "content"
 
-    converter = YdocConverter()
+    converter = YProviderAPI()
 
     expected_content = b"converted content"
     mock_response = MagicMock()
@@ -93,20 +94,75 @@ def test_convert_full_integration(mock_post, settings):
 @patch("requests.post")
 def test_convert_timeout(mock_post):
     """Should raise ServiceUnavailableError when request times out."""
-    converter = YdocConverter()
+    converter = YProviderAPI()
 
     mock_post.side_effect = requests.Timeout("Request timed out")
 
     with pytest.raises(
         ServiceUnavailableError,
-        match="Failed to connect to conversion service",
+        match="Failed to connect to backend service",
     ):
         converter.convert("test text")
 
 
 def test_convert_none_input():
     """Should raise ValidationError when input is None."""
-    converter = YdocConverter()
+    converter = YProviderAPI()
 
     with pytest.raises(ValidationError, match="Input text cannot be empty"):
         converter.convert(None)
+
+
+def test_content_empty_content():
+    """Should raise ValidationError when content is empty."""
+    converter = YProviderAPI()
+    with pytest.raises(ValidationError, match="Input content cannot be empty"):
+        converter.content("", "markdown")
+
+
+@patch("requests.post")
+def test_content_service_unavailable(mock_post):
+    """Should raise ServiceUnavailableError when service is unavailable."""
+    converter = YProviderAPI()
+
+    mock_post.side_effect = requests.RequestException("Connection error")
+
+    with pytest.raises(
+        ServiceUnavailableError,
+        match="Failed to connect to backend service",
+    ):
+        converter.content("test_content", "markdown")
+
+
+@patch("requests.post")
+def test_content_success(mock_post, settings):
+    """Test successful content fetch."""
+    settings.Y_PROVIDER_API_BASE_URL = "http://test.com/api/"
+    settings.Y_PROVIDER_API_KEY = "test-key"
+    settings.CONVERSION_API_TIMEOUT = 5
+    settings.CONVERSION_API_SECURE = False
+
+    converter = YProviderAPI()
+
+    expected_response = {
+        "content": "# Test Document\n\nThis is test content.",
+        "format": "markdown",
+    }
+    mock_response = MagicMock()
+    mock_response.json.return_value = expected_response
+    mock_response.raise_for_status.return_value = None
+    mock_post.return_value = mock_response
+
+    result = converter.content("test_content", "markdown")
+
+    assert result == expected_response
+    mock_post.assert_called_once_with(
+        "http://test.com/api/content/",
+        data=json.dumps({"content": "test_content", "format": "markdown"}),
+        headers={
+            "Authorization": "Bearer test-key",
+            "Content-Type": "application/json",
+        },
+        timeout=5,
+        verify=False,
+    )
diff --git a/src/frontend/servers/y-provider/__tests__/content.test.ts b/src/frontend/servers/y-provider/__tests__/content.test.ts
new file mode 100644
index 00000000..555b453a
--- /dev/null
+++ b/src/frontend/servers/y-provider/__tests__/content.test.ts
@@ -0,0 +1,207 @@
+import { ServerBlockNoteEditor } from '@blocknote/server-util';
+import request from 'supertest';
+import { describe, expect, test, vi } from 'vitest';
+import * as Y from 'yjs';
+
+vi.mock('../src/env', async (importOriginal) => {
+  return {
+    ...(await importOriginal()),
+    COLLABORATION_SERVER_ORIGIN: 'http://localhost:3000',
+    Y_PROVIDER_API_KEY: 'yprovider-api-key',
+  };
+});
+
+import { initApp } from '@/servers';
+
+import {
+  Y_PROVIDER_API_KEY as apiKey,
+  COLLABORATION_SERVER_ORIGIN as origin,
+} from '../src/env';
+
+console.error = vi.fn();
+
+describe('Content API Tests', () => {
+  test('POST /api/content with incorrect API key responds with 401', async () => {
+    const app = initApp();
+
+    const response = await request(app)
+      .post('/api/content')
+      .set('origin', origin)
+      .set('authorization', 'wrong-api-key')
+      .set('content-type', 'application/json')
+      .send({
+        content: 'dGVzdA==', // base64 for "test"
+        format: 'json',
+      });
+
+    expect(response.status).toBe(401);
+    expect(response.body).toStrictEqual({
+      error: 'Unauthorized: Invalid API Key',
+    });
+  });
+
+  test('POST /api/content with incorrect Bearer token responds with 401', async () => {
+    const app = initApp();
+
+    const response = await request(app)
+      .post('/api/content')
+      .set('origin', origin)
+      .set('authorization', 'Bearer test-secret-api-key')
+      .set('content-type', 'application/json')
+      .send({
+        content: 'dGVzdA==', // base64 for "test"
+        format: 'json',
+      });
+
+    expect(response.status).toBe(401);
+    expect(response.body).toStrictEqual({
+      error: 'Unauthorized: Invalid API Key',
+    });
+  });
+
+  test('POST /api/content with missing content parameter', async () => {
+    const app = initApp();
+
+    const response = await request(app)
+      .post('/api/content')
+      .set('origin', origin)
+      .set('authorization', apiKey)
+      .set('content-type', 'application/json')
+      .send({
+        format: 'json',
+      });
+
+    expect(response.status).toBe(400);
+    expect(response.body).toStrictEqual({
+      error: 'Invalid request: missing content',
+    });
+  });
+
+  test('POST /api/content with empty content', async () => {
+    const app = initApp();
+
+    const response = await request(app)
+      .post('/api/content')
+      .set('origin', origin)
+      .set('authorization', apiKey)
+      .set('content-type', 'application/json')
+      .send({
+        content: '',
+        format: 'json',
+      });
+
+    expect(response.status).toBe(400);
+    expect(response.body).toStrictEqual({
+      error: 'Invalid request: missing content',
+    });
+  });
+
+  test('POST /api/content with missing format parameter', async () => {
+    const app = initApp();
+
+    const response = await request(app)
+      .post('/api/content')
+      .set('origin', origin)
+      .set('authorization', apiKey)
+      .set('content-type', 'application/json')
+      .send({
+        content: 'dGVzdA==',
+      });
+
+    expect(response.status).toBe(400);
+    expect(response.body).toStrictEqual({
+      error: 'Invalid format. Must be one of: json, markdown, html',
+    });
+  });
+
+  test('POST /api/content with invalid format', async () => {
+    const app = initApp();
+
+    const response = await request(app)
+      .post('/api/content')
+      .set('origin', origin)
+      .set('authorization', apiKey)
+      .set('content-type', 'application/json')
+      .send({
+        content: 'dGVzdA==',
+        format: 'invalid',
+      });
+
+    expect(response.status).toBe(400);
+    expect(response.body).toStrictEqual({
+      error: 'Invalid format. Must be one of: json, markdown, html',
+    });
+  });
+
+  test.each([
+    { authHeader: `Bearer ${apiKey}`, format: 'json' },
+    { authHeader: `Bearer ${apiKey}`, format: 'markdown' },
+    { authHeader: `Bearer ${apiKey}`, format: 'html' },
+  ])(
+    'POST /api/content with correct content and format $format with Authorization: $authHeader',
+    async ({ authHeader, format }) => {
+      const app = initApp();
+
+      // Create a simple Yjs document for testing using BlockNote
+      const editor = ServerBlockNoteEditor.create();
+      const markdownContent = '# Test Document\n\nThis is test content.';
+      const blocks = await editor.tryParseMarkdownToBlocks(markdownContent);
+      const yDocument = editor.blocksToYDoc(blocks, 'document-store');
+      const yjsUpdate = Y.encodeStateAsUpdate(yDocument);
+      const base64Content = Buffer.from(yjsUpdate).toString('base64');
+
+      const response = await request(app)
+        .post('/api/content')
+        .set('Origin', origin)
+        .set('Authorization', authHeader)
+        .set('content-type', 'application/json')
+        .send({
+          content: base64Content,
+          format: format,
+        });
+      expect(response.status).toBe(200);
+      expect(response.body).toHaveProperty('content');
+      expect(response.body).toHaveProperty('format', format);
+
+      // Verify the content based on format
+      if (format === 'json') {
+        const parsedContent = response.body.content;
+        expect(Array.isArray(parsedContent)).toBe(true);
+        expect(parsedContent.length).toBe(2);
+        expect(parsedContent[0].type).toBe('heading');
+        expect(parsedContent[1].type).toBe('paragraph');
+        expect(parsedContent[0].content[0].type).toBe('text');
+        expect(parsedContent[0].content[0].text).toBe('Test Document');
+        expect(parsedContent[1].content[0].type).toBe('text');
+        expect(parsedContent[1].content[0].text).toBe('This is test content.');
+      } else if (format === 'markdown') {
+        expect(typeof response.body.content).toBe('string');
+        expect(response.body.content.trim()).toBe(markdownContent);
+      } else if (format === 'html') {
+        expect(typeof response.body.content).toBe('string');
+        expect(response.body.content).toBe(
+          '<h1>Test Document</h1><p>This is test content.</p>',
+        );
+      }
+    },
+  );
+
+  test('POST /api/content with invalid base64 content returns 500', async () => {
+    const app = initApp();
+
+    const response = await request(app)
+      .post('/api/content')
+      .set('origin', origin)
+      .set('authorization', apiKey)
+      .set('content-type', 'application/json')
+      .send({
+        content: 'invalid-base64-content!@#',
+        format: 'json',
+      });
+
+    expect(response.status).toBe(500);
+    expect(response.body).toStrictEqual({
+      error: 'An error occurred during conversion',
+    });
+  });
+});
diff --git a/src/frontend/servers/y-provider/package.json b/src/frontend/servers/y-provider/package.json
index 759578db..eb86b204 100644
--- a/src/frontend/servers/y-provider/package.json
+++ b/src/frontend/servers/y-provider/package.json
@@ -10,7 +10,7 @@
     "dev": "cross-env COLLABORATION_LOGGING=true && nodemon --config nodemon.json",
     "start": "node ./dist/start-server.js",
     "lint": "eslint . --ext .ts",
-    "test": "vitest --run"
+    "test": "vitest --run --disable-console-intercept"
   },
   "engines": {
     "node": ">=22"
diff --git a/src/frontend/servers/y-provider/src/handlers/contentHandler.ts b/src/frontend/servers/y-provider/src/handlers/contentHandler.ts
new file mode 100644
index 00000000..671ec89d
--- /dev/null
+++ b/src/frontend/servers/y-provider/src/handlers/contentHandler.ts
@@ -0,0 +1,71 @@
+import { PartialBlock } from '@blocknote/core';
+import { ServerBlockNoteEditor } from '@blocknote/server-util';
+import { Request, Response } from 'express';
+import * as Y from 'yjs';
+
+import { logger } from '@/utils';
+
+interface ErrorResponse {
+  error: string;
+}
+
+interface ContentRequest {
+  content: string;
+  format: string;
+}
+
+const editor = ServerBlockNoteEditor.create();
+
+export const contentHandler = async (
+  req: Request<object, object | ErrorResponse, ContentRequest, object>,
+  res: Response<object | ErrorResponse>,
+) => {
+  const { content, format } = req.body;
+
+  if (!content) {
+    res.status(400).json({ error: 'Invalid request: missing content' });
+    return;
+  }
+
+  if (!format || !['json', 'markdown', 'html'].includes(format)) {
+    res
+      .status(400)
+      .json({ error: 'Invalid format. Must be one of: json, markdown, html' });
+    return;
+  }
+
+  try {
+    // Decode base64 content to Uint8Array
+    const uint8Array = new Uint8Array(Buffer.from(content, 'base64'));
+
+    // Create Yjs document and apply the update
+    const yDocument = new Y.Doc();
+    Y.applyUpdate(yDocument, uint8Array);
+
+    // Convert to blocks
+    const blocks = editor.yDocToBlocks(yDocument, 'document-store');
+
+    let result: string | object | null;
+
+    if (!blocks || blocks.length === 0) {
+      result = null;
+    } else if (format === 'json') {
+      result = blocks;
+    } else if (format === 'markdown') {
+      result = await editor.blocksToMarkdownLossy(blocks as PartialBlock[]);
+    } else if (format === 'html') {
+      result = await editor.blocksToHTMLLossy(blocks as PartialBlock[]);
+    } else {
+      res.status(400).json({ error: 'Unsupported format' });
+      return;
+    }
+
+    res.status(200).json({
+      content: result,
+      format: format,
+    });
+  } catch (e) {
+    logger('content conversion failed:', e);
+    res.status(500).json({ error: 'An error occurred during conversion' });
+  }
+};
diff --git a/src/frontend/servers/y-provider/src/handlers/index.ts b/src/frontend/servers/y-provider/src/handlers/index.ts
index 26b0ebed..19666250 100644
--- a/src/frontend/servers/y-provider/src/handlers/index.ts
+++ b/src/frontend/servers/y-provider/src/handlers/index.ts
@@ -1,4 +1,5 @@
 export * from './collaborationResetConnectionsHandler';
 export * from './collaborationWSHandler';
 export * from './convertHandler';
+export * from './contentHandler';
 export * from './getDocumentConnectionInfoHandler';
diff --git a/src/frontend/servers/y-provider/src/routes.ts b/src/frontend/servers/y-provider/src/routes.ts
index 5bb73365..4c5d8ca2 100644
--- a/src/frontend/servers/y-provider/src/routes.ts
+++ b/src/frontend/servers/y-provider/src/routes.ts
@@ -2,5 +2,6 @@ export const routes = {
   COLLABORATION_WS: '/collaboration/ws/',
   COLLABORATION_RESET_CONNECTIONS: '/collaboration/api/reset-connections/',
   CONVERT: '/api/convert/',
+  CONTENT: '/api/content/',
   COLLABORATION_GET_CONNECTIONS: '/collaboration/api/get-connections/',
 };
diff --git a/src/frontend/servers/y-provider/src/servers/appServer.ts b/src/frontend/servers/y-provider/src/servers/appServer.ts
index 0c355fee..ae008b36 100644
--- a/src/frontend/servers/y-provider/src/servers/appServer.ts
+++ b/src/frontend/servers/y-provider/src/servers/appServer.ts
@@ -8,6 +8,7 @@ import expressWebsockets from 'express-ws';
 import {
   collaborationResetConnectionsHandler,
   collaborationWSHandler,
+  contentHandler,
   convertHandler,
   getDocumentConnectionInfoHandler,
 } from '@/handlers';
@@ -61,6 +62,11 @@ export const initApp = () => {
     convertHandler,
   );
 
+  /**
+   * Route to convert base64 Yjs content to different formats
+   */
+  app.post(routes.CONTENT, httpSecurity, express.json(), contentHandler);
+
   Sentry.setupExpressErrorHandler(app);
 
   app.get('/ping', (req, res) => {