From 202cff1f62a4f9a1486c649d020bd4388d2a32bd Mon Sep 17 00:00:00 2001
From: ahmadabuwardeh <ahm.abuwardeh@gmail.com>
Date: Sat, 20 Jan 2024 07:04:15 -0800
Subject: [PATCH] feat: use XBlockI18NService js translations

---
 CHANGELOG.rst              |  5 ++++
 lti_consumer/__init__.py   |  2 +-
 lti_consumer/lti_xblock.py | 59 +++++++++++++++++++++++++++-----------
 lti_consumer/utils.py      | 16 +++++++++++
 4 files changed, 65 insertions(+), 17 deletions(-)

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index f6fe13f0..dfb40d5d 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -15,6 +15,11 @@ Please See the `releases tab <https://github.com/openedx/xblock-lti-consumer/rel
 
 Unreleased
 ~~~~~~~~~~
+
+9.9.0 (2024-01-24)
+---------------------------
+* XBlockI18NService js translations support
+
 9.8.2 - 2024-01-19
 ------------------
 * Add NewRelic traces to functions suspected of causing performance issues.
diff --git a/lti_consumer/__init__.py b/lti_consumer/__init__.py
index 02aa0744..0ba711e2 100644
--- a/lti_consumer/__init__.py
+++ b/lti_consumer/__init__.py
@@ -4,4 +4,4 @@
 from .apps import LTIConsumerApp
 from .lti_xblock import LtiConsumerXBlock
 
-__version__ = '9.8.2'
+__version__ = '9.9.0'
diff --git a/lti_consumer/lti_xblock.py b/lti_consumer/lti_xblock.py
index bf18b4b2..fb8cb16e 100644
--- a/lti_consumer/lti_xblock.py
+++ b/lti_consumer/lti_xblock.py
@@ -87,6 +87,7 @@
     external_user_id_1p1_launches_enabled,
     database_config_enabled,
     EXTERNAL_ID_REGEX,
+    DummyTranslationService,
 )
 
 log = logging.getLogger(__name__)
@@ -257,6 +258,7 @@ class LtiConsumerXBlock(StudioEditableXBlockMixin, XBlock):
     """
 
     block_settings_key = 'lti_consumer'
+    i18n_js_namespace = 'LtiI18N'
 
     display_name = String(
         display_name=_("Display Name"),
@@ -663,10 +665,13 @@ def workbench_scenarios():
         return scenarios
 
     @staticmethod
-    def _get_statici18n_js_url(loader):  # pragma: no cover
+    def _get_deprecated_i18n_js_url(loader):
         """
-        Returns the Javascript translation file for the currently selected language, if any found by
+        Returns the deprecated JavaScript translation file for the currently selected language, if any found by
         `pkg_resources`
+
+        This method returns pre-OEP-58 i18n files and is deprecated in favor
+        of `get_javascript_i18n_catalog_url`.
         """
         lang_code = translation.get_language()
         if not lang_code:
@@ -678,17 +683,30 @@ def _get_statici18n_js_url(loader):  # pragma: no cover
                 return text_js.format(lang_code=code)
         return None
 
+    def _get_statici18n_js_url(self, loader):
+        """
+        Return the JavaScript translation file provided by the XBlockI18NService.
+        """
+        if url_getter_func := getattr(self.i18n_service, 'get_javascript_i18n_catalog_url', None):
+            if javascript_url := url_getter_func(self):
+                return javascript_url
+
+        if deprecated_url := self._get_deprecated_i18n_js_url(loader):
+            return self.runtime.local_resource_url(self, deprecated_url)
+
+        return None
+
     def validate_field_data(self, validation, data):
         # Validate custom parameters is a list.
         if not isinstance(data.custom_parameters, list):
-            _ = self.runtime.service(self, "i18n").ugettext
+            _ = self.i18n_service.ugettext
             validation.add(ValidationMessage(ValidationMessage.ERROR, str(
                 _("Custom Parameters must be a list")
             )))
 
         # Validate custom parameters format.
         if not all(map(CUSTOM_PARAMETER_REGEX.match, data.custom_parameters)):
-            _ = self.runtime.service(self, 'i18n').ugettext
+            _ = self.i18n_service.ugettext
             validation.add(ValidationMessage(ValidationMessage.ERROR, str(
                 _('Custom Parameters should be strings in "x=y" format.'),
             )))
@@ -698,7 +716,7 @@ def validate_field_data(self, validation, data):
             data.config_type == 'external' and not
             (data.external_config and EXTERNAL_ID_REGEX.match(str(data.external_config)))
         ):
-            _ = self.runtime.service(self, 'i18n').ugettext
+            _ = self.i18n_service.ugettext
             validation.add(ValidationMessage(ValidationMessage.ERROR, str(
                 _('Reusable configuration ID must be set when using external config (Example: "x:y").'),
             )))
@@ -714,7 +732,7 @@ def validate(self):
         Validate this XBlock's configuration
         """
         validation = super().validate()
-        _ = self.runtime.service(self, "i18n").ugettext
+        _ = self.i18n_service.ugettext
         # Check if lti_id exists in the LTI passports of the current course. (LTI 1.1 only)
         # This validation is just for the Unit page in Studio; we don't want to block users from saving
         # a new LTI ID before they've added it to advanced settings, but we do want to warn them about it.
@@ -776,6 +794,15 @@ def get_pii_sharing_enabled(self):
         #       because the service is not defined in those contexts.
         return True
 
+    @property
+    def i18n_service(self):
+        """ Obtains translation service """
+        i18n_service = self.runtime.service(self, "i18n")
+        if i18n_service:
+            return i18n_service
+        else:
+            return DummyTranslationService()
+
     @property
     def editable_fields(self):
         """
@@ -852,7 +879,7 @@ def role(self):
         """
         user = self.runtime.service(self, 'user').get_current_user()
         if not user.opt_attrs["edx-platform.is_authenticated"]:
-            raise LtiError(self.ugettext("Could not get user data for current request"))
+            raise LtiError(self.i18n_service.ugettext("Could not get user data for current request"))
 
         return user.opt_attrs.get('edx-platform.user_role', 'student')
 
@@ -878,7 +905,7 @@ def lti_provider_key_secret(self):
                     raise ValueError
                 key = ':'.join(key)
             except ValueError as err:
-                msg = self.ugettext(
+                msg = self.i18n_service.ugettext(
                     'Could not parse LTI passport: {lti_passport!r}. Should be "id:key:secret" string.'
                 ).format(lti_passport=lti_passport)
                 raise LtiError(msg) from err
@@ -897,7 +924,7 @@ def lms_user_id(self):
             'edx-platform.user_id', None)
 
         if user_id is None:
-            raise LtiError(self.ugettext("Could not get user id for current request"))
+            raise LtiError(self.i18n_service.ugettext("Could not get user id for current request"))
         return user_id
 
     @property
@@ -911,7 +938,7 @@ def anonymous_user_id(self):
             'edx-platform.anonymous_user_id', None)
 
         if user_id is None:
-            raise LtiError(self.ugettext("Could not get user id for current request"))
+            raise LtiError(self.i18n_service.ugettext("Could not get user id for current request"))
         return str(user_id)
 
     def get_icon_class(self):
@@ -927,7 +954,7 @@ def external_user_id(self):
         """
         user_id = self.runtime.service(self, 'user').get_external_user_id('lti')
         if user_id is None:
-            raise LtiError(self.ugettext("Could not get user id for current request"))
+            raise LtiError(self.i18n_service.ugettext("Could not get user id for current request"))
         return str(user_id)
 
     def get_lti_1p1_user_id(self):
@@ -1061,8 +1088,8 @@ def prefixed_custom_parameters(self):
                 try:
                     param_name, param_value = [p.strip() for p in custom_parameter.split('=', 1)]
                 except ValueError as err:
-                    _ = self.runtime.service(self, "i18n").ugettext
-                    msg = self.ugettext(
+                    _ = self.i18n_service.ugettext
+                    msg = self.i18n_service.ugettext(
                         'Could not parse custom parameter: {custom_parameter!r}. Should be "x=y" string.'
                     ).format(custom_parameter=custom_parameter)
                     raise LtiError(msg) from err
@@ -1130,7 +1157,7 @@ def extract_real_user_data(self):
         user = self.runtime.service(self, 'user').get_current_user()
 
         if not user.opt_attrs["edx-platform.is_authenticated"]:
-            raise LtiError(self.ugettext("Could not get user data for current request"))
+            raise LtiError(self.i18n_service.ugettext("Could not get user data for current request"))
 
         user_data = {
             'user_email': None,
@@ -1192,7 +1219,7 @@ def author_view(self, context):
             loader.render_django_template(
                 '/templates/html/lti_1p3_studio.html',
                 context,
-                i18n_service=self.runtime.service(self, 'i18n')
+                i18n_service=self.i18n_service
             ),
         )
         fragment.add_css(loader.load_unicode('static/css/student.css'))
@@ -1226,7 +1253,7 @@ def student_view(self, context):
         fragment.add_javascript(loader.load_unicode('static/js/xblock_lti_consumer.js'))
         statici18n_js_url = self._get_statici18n_js_url(loader)
         if statici18n_js_url:
-            fragment.add_javascript_url(self.runtime.local_resource_url(self, statici18n_js_url))
+            fragment.add_javascript_url(statici18n_js_url)
         fragment.initialize_js('LtiConsumerXBlock')
         return fragment
 
diff --git a/lti_consumer/utils.py b/lti_consumer/utils.py
index a6acbd4d..fb0a36d4 100644
--- a/lti_consumer/utils.py
+++ b/lti_consumer/utils.py
@@ -31,6 +31,14 @@ def _(text):
     return text
 
 
+def ngettext_fallback(text_singular, text_plural, number):
+    """ Dummy `ngettext` replacement to make string extraction tools scrape strings marked for translation """
+    if number == 1:
+        return text_singular
+    else:
+        return text_plural
+
+
 def get_lti_api_base():
     """
     Returns base url to be used as issuer on OAuth2 flows
@@ -361,3 +369,11 @@ def model_to_dict(model_object, exclude=None):
         return object_fields
     except (AttributeError, TypeError):
         return {}
+
+
+class DummyTranslationService:
+    """
+    Dummy drop-in replacement for i18n XBlock service
+    """
+    gettext = _
+    ngettext = ngettext_fallback