add REST API

src/c3nav/api/permissions.py

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+from rest_framework.permissions import BasePermission
+from rest_framework.exceptions import PermissionDenied
+from django.conf import settings
+from django.utils.translation import ugettext_lazy as _
+
+from ..mapdata.models import Source
+
+
+def get_unlocked_packages(request):
+    return set(settings.PUBLIC_PACKAGES) | set(request.session.get('unlocked_packages', ()))
+
+
+def can_access_package(request, package):
+    print(package.name == 'de.c3nav.33c3.base')
+    return package.name == 'de.c3nav.33c3.base'
+    return settings.DEBUG or package.name in get_unlocked_packages(request)
+
+
+def filter_source_queryset(request, queryset):
+    return queryset if settings.DEBUG else queryset.filter(package__name__in=get_unlocked_packages(request))
+
+
+class LockedMapFeatures(BasePermission):
+    def has_object_permission(self, request, view, obj):
+        if isinstance(obj, Source):
+            if not can_access_package(request, obj.package):
+                raise PermissionDenied(_('This Source belongs to a package you don\'t have access to.'))
+        return True

src/c3nav/api/serializers.py

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+from rest_framework.serializers import ModelSerializer
+
+from ..mapdata.models import Level, Package, Source
+
+
+class BoundsMixin:
+    def to_representation(self, obj):
+        result = super().to_representation(obj)
+        if obj.bottom is not None:
+            result['bounds'] = ((obj.bottom, obj.left), (obj.top, obj.right))
+        return result
+
+
+class LevelSerializer(ModelSerializer):
+    class Meta:
+        model = Level
+        fields = ('name', 'altitude', 'package')
+
+
+class PackageSerializer(BoundsMixin, ModelSerializer):
+    class Meta:
+        model = Package
+        fields = ('name', 'depends')
+
+
+class SourceSerializer(BoundsMixin, ModelSerializer):
+    class Meta:
+        model = Source
+        fields = ('name', 'package')

src/c3nav/api/urls.py

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+from django.conf.urls import include, url
+
+from rest_framework.routers import DefaultRouter
+
+from .views import map as map_views
+
+router = DefaultRouter()
+router.register(r'map/levels', map_views.LevelViewSet)
+router.register(r'map/packages', map_views.PackageViewSet)
+router.register(r'map/sources', map_views.SourceViewSet)
+
+
+urlpatterns = [
+    url(r'^(?P<version>v\d+)/', include(router.urls, namespace='v1')),
+]

src/c3nav/api/views/map.py

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+import mimetypes
+import os
+
+from django.conf import settings
+from django.core.files import File
+from django.http import HttpResponse
+
+from rest_framework.viewsets import ReadOnlyModelViewSet
+from rest_framework.decorators import detail_route
+
+from ...mapdata.models import Level, Package, Source
+from ..serializers import LevelSerializer, PackageSerializer, SourceSerializer
+from ..permissions import filter_source_queryset
+
+
+class LevelViewSet(ReadOnlyModelViewSet):
+    """
+    Returns a list of all levels on the map.
+    """
+    queryset = Level.objects.all()
+    serializer_class = LevelSerializer
+    lookup_value_regex = '[^/]+'
+    filter_fields = ('altitude', 'package')
+    ordering_fields = ('altitude', 'package')
+    ordering = ('altitude',)
+    search_fields = ('name',)
+
+
+class PackageViewSet(ReadOnlyModelViewSet):
+    """
+    Returns a list of all packages the map consists of.
+    """
+    queryset = Package.objects.all()
+    serializer_class = PackageSerializer
+    lookup_value_regex = '[^/]+'
+    filter_fields = ('name', 'depends')
+    ordering_fields = ('name',)
+    ordering = ('name',)
+    search_fields = ('name',)
+
+
+class SourceViewSet(ReadOnlyModelViewSet):
+    """
+    Returns a list of source images (to use as a drafts).
+    Call /sources/{name}/image to get the image.
+    """
+    queryset = Source.objects.all()
+    serializer_class = SourceSerializer
+    lookup_value_regex = '[^/]+'
+    filter_fields = ('package',)
+    ordering_fields = ('name', 'package')
+    ordering = ('name',)
+    search_fields = ('name',)
+
+    def get_queryset(self):
+        return filter_source_queryset(self.request, super().get_queryset())
+
+    @detail_route(methods=['get'])
+    def image(self, request, pk=None, version=None):
+        source = self.get_object()
+        response = HttpResponse(content_type=mimetypes.guess_type(source.name)[0])
+        image_path = os.path.join(settings.MAP_ROOT, source.package.directory, 'sources', source.name)
+        for chunk in File(open(image_path, 'rb')).chunks():
+            response.write(chunk)
+        return response