X-Git-Url: https://git.mdrn.pl/librarian.git/blobdiff_plain/88f39c4f90a67164b2c3da7c7a41df420f3b17ab..011b98a4661b754a0789ae78e145437b5b86e5fe:/src/librarian/picture.py diff --git a/src/librarian/picture.py b/src/librarian/picture.py deleted file mode 100644 index 8b2c882..0000000 --- a/src/librarian/picture.py +++ /dev/null @@ -1,238 +0,0 @@ -# This file is part of Librarian, licensed under GNU Affero GPLv3 or later. -# Copyright © Fundacja Wolne Lektury. See NOTICE for more information. -# -from operator import and_ -import functools -import io -from .dcparser import Field, WorkInfo, DCNS -from librarian import (RDFNS, ValidationError, NoDublinCore, ParseError, WLURI) -from xml.parsers.expat import ExpatError -from os import path -from lxml import etree -from lxml.etree import (XMLSyntaxError, XSLTApplyError, Element) -import re - - -class WLPictureURI(WLURI): - _re_wl_uri = re.compile( - 'http://wolnelektury.pl/katalog/obraz/(?P[-a-z0-9]+)/?$' - ) - template = 'http://wolnelektury.pl/katalog/obraz/%s/' - - -def as_wlpictureuri_strict(text): - return WLPictureURI.strict(text) - - -class PictureInfo(WorkInfo): - """ - Dublin core metadata for a picture - """ - FIELDS = ( - Field(DCNS('language'), 'language', required=False), - Field(DCNS('subject.period'), 'epochs', salias='epoch', multiple=True), - Field(DCNS('subject.type'), 'kinds', salias='kind', multiple=True), - Field(DCNS('subject.genre'), 'genres', salias='genre', multiple=True, - required=False), - Field(DCNS('subject.style'), 'styles', salias='style', multiple=True, - required=False), - - Field(DCNS('format.dimensions'), 'dimensions', required=False), - Field(DCNS('format.checksum.sha1'), 'sha1', required=True), - Field(DCNS('description.medium'), 'medium', required=False), - Field(DCNS('description.dimensions'), 'original_dimensions', - required=False), - Field(DCNS('format'), 'mime_type', required=False), - Field(DCNS('identifier.url'), 'url', WLPictureURI, - strict=as_wlpictureuri_strict) - ) - - -class ImageStore: - EXT = ['gif', 'jpeg', 'png', 'swf', 'psd', 'bmp' - 'tiff', 'tiff', 'jpc', 'jp2', 'jpf', 'jb2', 'swc', - 'aiff', 'wbmp', 'xbm'] - MIME = ['image/gif', 'image/jpeg', 'image/png', - 'application/x-shockwave-flash', 'image/psd', 'image/bmp', - 'image/tiff', 'image/tiff', 'application/octet-stream', - 'image/jp2', 'application/octet-stream', - 'application/octet-stream', 'application/x-shockwave-flash', - 'image/iff', 'image/vnd.wap.wbmp', 'image/xbm'] - - def __init__(self, dir_): - super(ImageStore, self).__init__() - self.dir = dir_ - - def path(self, slug, mime_type): - """ - Finds file by slug and mime type in our iamge store. - Returns a file objects (perhaps should return a filename?) - """ - try: - i = self.MIME.index(mime_type) - except ValueError: - err = ValueError( - "Picture %s has unknown mime type: %s" - % (slug, mime_type) - ) - err.slug = slug - err.mime_type = mime_type - raise err - ext = self.EXT[i] - # add some common extensions tiff->tif, jpeg->jpg - return path.join(self.dir, slug + '.' + ext) - - -class WLPicture: - def __init__(self, edoc, parse_dublincore=True, image_store=None): - self.edoc = edoc - self.image_store = image_store - - root_elem = edoc.getroot() - - dc_path = './/' + RDFNS('RDF') - - if root_elem.tag != 'picture': - raise ValidationError( - "Invalid root element. Found '%s', should be 'picture'" - % root_elem.tag - ) - - if parse_dublincore: - self.rdf_elem = root_elem.find(dc_path) - - if self.rdf_elem is None: - raise NoDublinCore( - "Document has no DublinCore - which is required." - ) - - self.picture_info = PictureInfo.from_element(self.rdf_elem) - else: - self.picture_info = None - self.frame = None - - @classmethod - def from_bytes(cls, xml, *args, **kwargs): - return cls.from_file(io.BytesIO(xml), *args, **kwargs) - - @classmethod - def from_file(cls, xmlfile, parse_dublincore=True, image_store=None): - - # first, prepare for parsing - if isinstance(xmlfile, str): - file = open(xmlfile, 'rb') - try: - data = file.read() - finally: - file.close() - else: - data = xmlfile.read() - - if not isinstance(data, str): - data = data.decode('utf-8') - - data = data.replace('\ufeff', '') - - # assume images are in the same directory - if image_store is None and getattr(xmlfile, 'name', None): - image_store = ImageStore(path.dirname(xmlfile.name)) - - try: - parser = etree.XMLParser(remove_blank_text=False) - tree = etree.parse(io.BytesIO(data.encode('utf-8')), parser) - - me = cls(tree, parse_dublincore=parse_dublincore, - image_store=image_store) - me.load_frame_info() - return me - except (ExpatError, XMLSyntaxError, XSLTApplyError) as e: - raise ParseError(e) - - @property - def mime_type(self): - if self.picture_info is None: - raise ValueError( - "DC is not loaded, hence we don't know the image type." - ) - return self.picture_info.mime_type - - @property - def slug(self): - return self.picture_info.url.slug - - @property - def image_path(self): - if self.image_store is None: - raise ValueError("No image store associated with whis WLPicture.") - - return self.image_store.path(self.slug, self.mime_type) - - def image_file(self, *args, **kwargs): - return open(self.image_path, 'rb', *args, **kwargs) - - def get_sem_coords(self, sem): - area = sem.find("div[@type='rect']") - if area is None: - area = sem.find("div[@type='whole']") - return [[0, 0], [-1, -1]] - - def has_all_props(node, props): - return functools.reduce( - and_, map(lambda prop: prop in node.attrib, props) - ) - - if not has_all_props(area, ['x1', 'x2', 'y1', 'y2']): - return None - - def n(prop): return int(area.get(prop)) - return [[n('x1'), n('y1')], [n('x2'), n('y2')]] - - def partiter(self): - """ - Iterates the parts of this picture and returns them - and their metadata. - """ - # omg no support for //sem[(@type='theme') or (@type='object')] ? - for part in list(self.edoc.iterfind("//sem[@type='theme']")) +\ - list(self.edoc.iterfind("//sem[@type='object']")): - pd = {'type': part.get('type')} - - coords = self.get_sem_coords(part) - if coords is None: - continue - pd['coords'] = coords - - def want_unicode(x): - if not isinstance(x, str): - return x.decode('utf-8') - else: - return x - pd['object'] = ( - part.attrib['type'] == 'object' - and want_unicode(part.attrib.get('object', '')) - or None - ) - pd['themes'] = ( - part.attrib['type'] == 'theme' - and [part.attrib.get('theme', '')] - or [] - ) - yield pd - - def load_frame_info(self): - k = self.edoc.find("//sem[@object='kadr']") - - if k is not None: - clip = self.get_sem_coords(k) - self.frame = clip - frm = Element("sem", {"type": "frame"}) - frm.append(next(k.iter("div"))) - self.edoc.getroot().append(frm) - k.getparent().remove(k) - else: - frm = self.edoc.find("//sem[@type='frame']") - if frm: - self.frame = self.get_sem_coords(frm) - else: - self.frame = None - return self