feat: add middleware to auto select user language

Author: asadali145

src/ol_openedx_course_translations/ol_openedx_course_translations/apps.py

@@ -19,5 +19,8 @@ class OLOpenedXCourseTranslationsConfig(AppConfig):
             ProjectType.CMS: {
                 SettingsType.COMMON: {PluginSettings.RELATIVE_PATH: "settings.common"},
             },
+            ProjectType.LMS: {
+                SettingsType.COMMON: {PluginSettings.RELATIVE_PATH: "settings.common"},
+            },
         },
     }

src/ol_openedx_course_translations/ol_openedx_course_translations/middleware.py

@@ -0,0 +1,48 @@
+# python
+import re
+
+from django.utils.deprecation import MiddlewareMixin
+from opaque_keys.edx.keys import CourseKey
+from openedx.core.djangoapps.content.course_overviews.models import CourseOverview
+from openedx.core.djangoapps.lang_pref import LANGUAGE_KEY
+from openedx.core.djangoapps.user_api.preferences.api import set_user_preference
+
+
+class CourseLanguageCookieMiddleware(MiddlewareMixin):
+    """
+    Sets language preference cookie and user preference based on course language.
+    """
+
+    COURSE_URL_REGEX = re.compile(
+        r"^/courses/(?P<course_key>course-v1:[A-Za-z0-9._-]+(?:\+[A-Za-z0-9._-]+)+)(?:/|$)",
+        re.IGNORECASE,
+    )
+    COOKIE_NAME = "openedx-language-preference"
+
+    def process_response(self, request, response):
+        path = getattr(request, "path_info", request.path)
+        match = self.COURSE_URL_REGEX.match(path)
+        if not match:
+            return response
+
+        course_key_str = match.group("course_key")
+        try:
+            course_key = CourseKey.from_string(course_key_str)
+            overview = CourseOverview.get_from_id(course_key)
+        except Exception:  # noqa: BLE001
+            return response
+
+        language = getattr(overview, "language", None)
+        response.set_cookie(
+            self.COOKIE_NAME,
+            language or "",
+            max_age=60 * 60 * 24 * 180,
+            httponly=False,
+            samesite="Lax",
+        )
+
+        # Set user preference if authenticated
+        if language and hasattr(request, "user") and request.user.is_authenticated:
+            set_user_preference(request.user, LANGUAGE_KEY, language)
+
+        return response