diora-web/gpodder/views.py

import base64
import json
from datetime import datetime, timezone
from functools import wraps

from django.contrib.auth import authenticate, login, logout
from django.http import JsonResponse
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.http import require_http_methods

from podcasts.models import PodcastFeed, PodcastEpisode, EpisodeProgress, PodcastSettings, counts_as_played
from podcasts.views import _refresh_feed
from .models import GpodderDevice, GpodderSubscriptionChange, GpodderEpisodeAction


def _basic_auth(request):
    auth = request.META.get('HTTP_AUTHORIZATION', '')
    if not auth.startswith('Basic '):
        return None
    try:
        credentials = base64.b64decode(auth[6:]).decode('utf-8')
        username, _, password = credentials.partition(':')
        user = authenticate(request, username=username, password=password)
        if user:
            login(request, user)
        return user
    except Exception:
        return None


def _resolve_user(request, username):
    if request.user.is_authenticated and request.user.username == username:
        return request.user
    user = _basic_auth(request)
    if user and user.username == username:
        return user
    return None


def gpodder_auth(func):
    @wraps(func)
    def wrapper(request, username, *args, **kwargs):
        user = _resolve_user(request, username)
        if not user:
            return JsonResponse({'error': 'unauthorized'}, status=401)
        return func(request, username, *args, **kwargs)
    return wrapper


def _now_ts():
    return int(datetime.now(timezone.utc).timestamp())


def _get_or_create_device(user, device_id):
    device, _ = GpodderDevice.objects.get_or_create(
        user=user, device_id=device_id,
        defaults={'caption': device_id, 'type': 'other'}
    )
    return device


# ---------------------------------------------------------------------------
# Auth
# ---------------------------------------------------------------------------

@csrf_exempt
@require_http_methods(['GET', 'POST'])
def auth_login(request, username):
    user = _resolve_user(request, username)
    if not user:
        return JsonResponse({'error': 'unauthorized'}, status=401)
    return JsonResponse({'username': user.username})


@csrf_exempt
@require_http_methods(['GET', 'POST'])
def auth_logout(request, username):
    logout(request)
    return JsonResponse({})


# ---------------------------------------------------------------------------
# Devices
# ---------------------------------------------------------------------------

@csrf_exempt
@gpodder_auth
def devices_list(request, username):
    devices = GpodderDevice.objects.filter(user=request.user)
    return JsonResponse([
        {'id': d.device_id, 'caption': d.caption, 'type': d.type, 'subscriptions': 0}
        for d in devices
    ], safe=False)


@csrf_exempt
@gpodder_auth
def device_update(request, username, deviceid):
    device = _get_or_create_device(request.user, deviceid)
    if request.method == 'POST':
        try:
            body = json.loads(request.body or '{}')
            if 'caption' in body:
                device.caption = body['caption'][:100]
            if 'type' in body:
                device.type = body['type'][:20]
            device.save()
        except (json.JSONDecodeError, ValueError):
            pass
    return JsonResponse({'id': device.device_id, 'caption': device.caption, 'type': device.type})


# ---------------------------------------------------------------------------
# Subscriptions
# ---------------------------------------------------------------------------

def _subscription_changes_since(user, since_ts):
    qs = GpodderSubscriptionChange.objects.filter(user=user)
    if since_ts:
        try:
            since_dt = datetime.fromtimestamp(int(since_ts), tz=timezone.utc)
            qs = qs.filter(timestamp__gt=since_dt)
        except (ValueError, OSError):
            pass

    added = list(qs.filter(action='add').values_list('url', flat=True).distinct())
    removed = list(qs.filter(action='remove').values_list('url', flat=True).distinct())
    # If a URL appears in both, the latest action wins — keep only consistent entries
    added = [u for u in added if u not in removed]
    removed = [u for u in removed if u not in added]
    return added, removed


@csrf_exempt
@gpodder_auth
def subscriptions_by_device(request, username, deviceid):
    _get_or_create_device(request.user, deviceid)

    if request.method == 'GET':
        since = request.GET.get('since')
        if since:
            added, removed = _subscription_changes_since(request.user, since)
            return JsonResponse({'add': added, 'remove': removed, 'timestamp': _now_ts(), 'update_urls': []})
        else:
            urls = list(PodcastFeed.objects.filter(user=request.user).values_list('rss_url', flat=True))
            return JsonResponse({'add': urls, 'remove': [], 'timestamp': _now_ts(), 'update_urls': []})

    elif request.method == 'POST':
        try:
            body = json.loads(request.body or '{}')
        except (json.JSONDecodeError, ValueError):
            return JsonResponse({'error': 'invalid JSON'}, status=400)

        new_feed = PodcastSettings.new_feed_defaults(request.user)
        for url in body.get('add', []):
            if not url:
                continue
            PodcastFeed.objects.get_or_create(
                user=request.user, rss_url=url,
                defaults={'title': url, **new_feed}
            )
            GpodderSubscriptionChange.objects.create(user=request.user, url=url, action='add')

        for url in body.get('remove', []):
            if not url:
                continue
            PodcastFeed.objects.filter(user=request.user, rss_url=url).delete()
            GpodderSubscriptionChange.objects.create(user=request.user, url=url, action='remove')

        return JsonResponse({'timestamp': _now_ts(), 'update_urls': []})


@csrf_exempt
@gpodder_auth
def subscriptions_all(request, username):
    since = request.GET.get('since')
    if since:
        added, removed = _subscription_changes_since(request.user, since)
        return JsonResponse({'add': added, 'remove': removed, 'timestamp': _now_ts(), 'update_urls': []})
    else:
        urls = list(PodcastFeed.objects.filter(user=request.user).values_list('rss_url', flat=True))
        return JsonResponse({'add': urls, 'remove': [], 'timestamp': _now_ts(), 'update_urls': []})


# ---------------------------------------------------------------------------
# Episode actions
# ---------------------------------------------------------------------------

@csrf_exempt
@gpodder_auth
def episode_actions(request, username):
    if request.method == 'POST':
        try:
            actions = json.loads(request.body or '[]')
        except (json.JSONDecodeError, ValueError):
            return JsonResponse({'error': 'invalid JSON'}, status=400)

        if not isinstance(actions, list):
            actions = [actions]

        for a in actions:
            if not isinstance(a, dict):
                continue
            podcast_url = a.get('podcast', '')
            episode_url = a.get('episode', '')
            action = a.get('action', '')
            if not (podcast_url and episode_url and action):
                continue

            ts_str = a.get('timestamp', '')
            try:
                ts = datetime.fromisoformat(ts_str.replace('Z', '+00:00')) if ts_str else datetime.now(timezone.utc)
            except (ValueError, AttributeError):
                ts = datetime.now(timezone.utc)

            device_id = a.get('device', '')
            device = _get_or_create_device(request.user, device_id) if device_id else None

            GpodderEpisodeAction.objects.create(
                user=request.user,
                device=device,
                podcast=podcast_url,
                episode=episode_url,
                action=action,
                timestamp=ts,
                started=a.get('started'),
                position=a.get('position'),
                total=a.get('total'),
            )

            # Sync playback position to EpisodeProgress
            if action == 'play' and a.get('position') is not None:
                try:
                    # Only this user's subscriptions: several users can have the same feed.
                    ep = PodcastEpisode.objects.filter(audio_url=episode_url, feed__user=request.user).first()
                    if ep:
                        pos = int(a['position'])
                        dur = ep.duration_seconds or 0
                        played = counts_as_played(pos, dur)
                        EpisodeProgress.objects.update_or_create(
                            user=request.user, episode=ep,
                            defaults={'position_seconds': pos, 'played': played}
                        )
                except Exception:
                    pass

        return JsonResponse({'timestamp': _now_ts(), 'update_urls': []})

    elif request.method == 'GET':
        since = request.GET.get('since')
        qs = GpodderEpisodeAction.objects.filter(user=request.user)
        if since:
            try:
                since_dt = datetime.fromtimestamp(int(since), tz=timezone.utc)
                qs = qs.filter(timestamp__gt=since_dt)
            except (ValueError, OSError):
                pass

        return JsonResponse({
            'actions': [
                {
                    'podcast': a.podcast,
                    'episode': a.episode,
                    'device': a.device.device_id if a.device else '',
                    'action': a.action,
                    'timestamp': a.timestamp.strftime('%Y-%m-%dT%H:%M:%S'),
                    'started': a.started,
                    'position': a.position,
                    'total': a.total,
                }
                for a in qs[:500]
            ],
            'timestamp': _now_ts(),
        })