+from catalogue.models import Book, Tag, BookMedia, Fragment
+
+
+API_BASE = WL_BASE = MEDIA_BASE = 'http://' + Site.objects.get_current().domain
+
+
+category_singular = {
+ 'authors': 'author',
+ 'kinds': 'kind',
+ 'genres': 'genre',
+ 'epochs': 'epoch',
+ 'themes': 'theme',
+ 'books': 'book',
+}
+category_plural={}
+for k, v in category_singular.items():
+ category_plural[v] = k
+
+
+def read_tags(tags, allowed):
+ """ Reads a path of filtering tags.
+
+ :param str tags: a path of category and slug pairs, like: authors/an-author/...
+ :returns: list of Tag objects
+ :raises: ValueError when tags can't be found
+ """
+ if not tags:
+ return []
+
+ tags = tags.strip('/').split('/')
+ real_tags = []
+ while tags:
+ category = tags.pop(0)
+ slug = tags.pop(0)
+
+ try:
+ category = category_singular[category]
+ except KeyError:
+ raise ValueError('Unknown category.')
+
+ if not category in allowed:
+ raise ValueError('Category not allowed.')
+
+ # !^%@#$^#!
+ if category == 'book':
+ slug = 'l-' + slug
+
+ try:
+ real_tags.append(Tag.objects.get(category=category, slug=slug))
+ except Tag.DoesNotExist:
+ raise ValueError('Tag not found')
+ return real_tags
+
+
+# RESTful handlers
+
+
+class BookMediaHandler(BaseHandler):
+ """ Responsible for representing media in Books. """
+
+ model = BookMedia
+ fields = ['name', 'type', 'url']
+
+ @classmethod
+ def url(cls, media):
+ """ Link to media on site. """
+
+ return MEDIA_BASE + media.file.url
+
+
+class BookDetailHandler(BaseHandler):
+ """ Main handler for Book objects.
+
+ Responsible for lists of Book objects
+ and fields used for representing Books.
+
+ """
+ allowed_methods = ['GET']
+ fields = ['title', 'parent',
+ 'xml', 'html', 'pdf', 'epub', 'txt',
+ 'media', 'url'] + category_singular.keys()
+
+ def read(self, request, slug):
+ """ Returns details of a book, identified by a slug. """
+
+ try:
+ return Book.objects.get(slug=slug)
+ except Book.DoesNotExist:
+ return rc.NOT_FOUND
+
+
+class BooksHandler(BaseHandler):
+ """ Main handler for Book objects.
+
+ Responsible for lists of Book objects
+ and fields used for representing Books.
+
+ """
+ allowed_methods = ('GET',)
+ model = Book
+ fields = ['href', 'title']
+
+ categories = set(['author', 'epoch', 'kind', 'genre'])
+
+ @classmethod
+ def href(cls, book):
+ """ Returns an URI for a Book in the API. """
+ return API_BASE + reverse("api_book", args=[book.slug])
+
+ @classmethod
+ def url(cls, book):
+ """ Returns Book's URL on the site. """
+
+ return WL_BASE + book.get_absolute_url()
+
+ def read(self, request, tags, top_level=False):
+ """ Lists all books with given tags.
+
+ :param tags: filtering tags; should be a path of categories
+ and slugs, i.e.: authors/an-author/epoch/an-epoch/
+ :param top_level: if True and a book is included in the results,
+ it's children are aren't. By default all books matching the tags
+ are returned.
+ """
+ tags = read_tags(tags, allowed=self.categories)
+ if tags:
+ if top_level:
+ books = Book.tagged_top_level(tags)
+ return books if books else rc.NOT_FOUND
+ else:
+ books = Book.tagged.with_all(tags)
+ else:
+ books = Book.objects.all()
+
+ if books.exists():
+ return books
+ else:
+ return rc.NOT_FOUND
+
+ @classmethod
+ def media(self, book):
+ """ Returns all media for a book. """
+
+ return book.media.all()
+
+
+# add categorized tags fields for Book
+def _tags_getter(category):
+ @classmethod
+ def get_tags(cls, book):
+ return book.tags.filter(category=category)
+ return get_tags
+for plural, singular in category_singular.items():
+ setattr(BooksHandler, plural, _tags_getter(singular))
+
+# add fields for files in Book
+def _file_getter(format):
+ field = "%s_file" % format
+ @classmethod
+ def get_file(cls, book):
+ f = getattr(book, field)
+ if f:
+ return MEDIA_BASE + f.url
+ else:
+ return ''
+ return get_file
+for format in ('xml', 'txt', 'html', 'epub', 'pdf'):
+ setattr(BooksHandler, format, _file_getter(format))
+
+
+class TagDetailHandler(BaseHandler):
+ """ Responsible for details of a single Tag object. """
+
+ fields = ['name', 'sort_key', 'description']
+
+ def read(self, request, category, slug):
+ """ Returns details of a tag, identified by category and slug. """
+
+ try:
+ category_sng = category_singular[category]
+ except KeyError, e:
+ return rc.NOT_FOUND
+
+ try:
+ return Tag.objects.get(category=category_sng, slug=slug)
+ except Tag.DoesNotExist:
+ return rc.NOT_FOUND
+
+
+class TagsHandler(BaseHandler):
+ """ Main handler for Tag objects.
+
+ Responsible for lists of Tag objects
+ and fields used for representing Tags.
+
+ """
+ allowed_methods = ('GET',)
+ model = Tag
+ fields = ['name', 'href']
+
+ def read(self, request, category):
+ """ Lists all tags in the category (eg. all themes). """
+
+ try:
+ category_sng = category_singular[category]
+ except KeyError, e:
+ return rc.NOT_FOUND
+
+ tags = Tag.objects.filter(category=category_sng)
+ tags = [t for t in tags if t.get_count() > 0]
+ if tags:
+ return tags
+ else:
+ return rc.NOT_FOUND
+
+
+ @classmethod
+ def href(cls, tag):
+ """ Returns URI in the API for the tag. """
+
+ return API_BASE + reverse("api_tag", args=[category_plural[tag.category], tag.slug])
+
+
+class FragmentDetailHandler(BaseHandler):
+ fields = ['book', 'anchor', 'text', 'url', 'themes']
+
+ def read(self, request, slug, anchor):
+ """ Returns details of a fragment, identified by book slug and anchor. """
+
+ try:
+ return Fragment.objects.get(book__slug=slug, anchor=anchor)
+ except Fragment.DoesNotExist:
+ return rc.NOT_FOUND
fnp / wolnelektury.git / blobdiff