def exercise_handler(request, exercise, prev=None, next=None, **related_videos):
"""
Display an exercise
"""
lang = request.session["django_language"]
exercise_root = os.path.join(settings.STATIC_ROOT, "js", "khan-exercises", "exercises")
exercise_file = exercise["slug"] + ".html"
exercise_template = exercise_file
exercise_localized_template = os.path.join(lang, exercise_file)
# Get the language codes for exercise teplates that exist
exercise_path = partial(lambda lang, slug, eroot: os.path.join(eroot, lang, slug + ".html"), slug=exercise["slug"], eroot=exercise_root)
code_filter = partial(lambda lang, eroot, epath: os.path.isdir(os.path.join(eroot, lang)) and os.path.exists(epath(lang)), eroot=exercise_root, epath=exercise_path)
available_langs = set(["en"] + [lang_code for lang_code in os.listdir(exercise_root) if code_filter(lang_code)])
# Return the best available exercise template
exercise_lang = select_best_available_language(available_langs, target_code=request.language)
if exercise_lang == "en":
exercise_template = exercise_file
else:
exercise_template = exercise_path(exercise_lang)[(len(exercise_root) + 1):]
context = {
"exercise": exercise,
"title": exercise["title"],
"exercise_template": exercise_template,
"exercise_lang": exercise_lang,
"related_videos": [v for v in related_videos.values() if v["available"]],
"prev": prev,
"next": next,
}
return context
def video_handler(request, video, format="mp4", prev=None, next=None):
if not video["available"]:
if request.is_admin:
# TODO(bcipolli): add a link, with querystring args that auto-checks this video in the topic tree
messages.warning(request, _("This video was not found! You can download it by going to the Update page."))
elif request.is_logged_in:
messages.warning(request, _("This video was not found! Please contact your teacher or an admin to have it downloaded."))
elif not request.is_logged_in:
messages.warning(request, _("This video was not found! You must login as an admin/teacher to download the video."))
# Fallback mechanism
available_urls = dict([(lang, avail) for lang, avail in video["availability"].iteritems() if avail["on_disk"]])
if video["available"] and not available_urls:
vid_lang = "en"
messages.success(request, "Got video content from %s" % video["availability"]["en"]["stream"])
else:
vid_lang = select_best_available_language(available_urls.keys(), target_code=request.language)
context = {
"video": video,
"title": video["title"],
"selected_language": vid_lang,
"video_urls": video["availability"].get(vid_lang),
"subtitle_urls": video["availability"].get(vid_lang, {}).get("subtitles"),
"prev": prev,
"next": next,
"backup_vids_available": bool(settings.BACKUP_VIDEO_SOURCE),
"use_mplayer": settings.USE_MPLAYER and is_loopback_connection(request),
}
return context