Picture support
authorMarcin Koziej <marcin.koziej@nowoczesnapolska.org.pl>
Wed, 14 Dec 2011 13:01:17 +0000 (14:01 +0100)
committerMarcin Koziej <marcin.koziej@nowoczesnapolska.org.pl>
Wed, 14 Dec 2011 13:01:17 +0000 (14:01 +0100)
librarian/__init__.py
librarian/dcparser.py
librarian/picture.py [new file with mode: 0644]
tests/files/picture/angelus-novus.png [new file with mode: 0644]
tests/files/picture/angelus-novus.xml [new file with mode: 0644]
tests/test_picture.py [new file with mode: 0644]

index 32a3af0..42bc518 100644 (file)
@@ -138,9 +138,9 @@ class DocProvider(object):
         """Should return a file-like object with a WL document XML."""
         return self.by_slug_and_lang(slug)
 
         """Should return a file-like object with a WL document XML."""
         return self.by_slug_and_lang(slug)
 
-    def by_uri(self, uri):
+    def by_uri(self, uri, wluri=WLURI):
         """Should return a file-like object with a WL document XML."""
         """Should return a file-like object with a WL document XML."""
-        wluri = WLURI(uri)
+        wluri = wluri(uri)
         return self.by_slug_and_lang(wluri.slug, wluri.language)
 
 
         return self.by_slug_and_lang(wluri.slug, wluri.language)
 
 
index 992029e..f5fd42a 100644 (file)
@@ -118,36 +118,48 @@ class Field(object):
 
         return self.validate_value(f)
 
 
         return self.validate_value(f)
 
+    def __eq__(self, other):
+        if isinstance(other, Field) and other.name == self.name:
+            return True
+        return False
 
 
 
 
+class DCInfo(type):
+    def __new__(meta, classname, bases, class_dict):
+        fields = class_dict['FIELDS']
+
+        for base in bases[::-1]:
+            if hasattr(base, 'FIELDS'):
+                for field in base.FIELDS[::-1]:
+                    try:
+                        fields.index(field)
+                    except ValueError:
+                        fields = (field,) + fields
+
+        class_dict['FIELDS'] = fields
+        return super(DCInfo, meta).__new__(meta, classname, bases, class_dict)
+
+
+class WorkInfo(object):
+    __metaclass__ = DCInfo
 
 
-class BookInfo(object):
     FIELDS = (
         Field( DCNS('creator'), 'author', as_person),
         Field( DCNS('title'), 'title'),
     FIELDS = (
         Field( DCNS('creator'), 'author', as_person),
         Field( DCNS('title'), 'title'),
+        Field( DCNS('type'), 'type', required=False, multiple=True),
+
         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),
         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),
-        Field( DCNS('audience'), 'audiences', salias='audience', multiple=True,
-                required=False),
+
         Field( DCNS('date'), 'created_at', as_date),
         Field( DCNS('date.pd'), 'released_to_public_domain_at', as_date, required=False),
         Field( DCNS('date'), 'created_at', as_date),
         Field( DCNS('date.pd'), 'released_to_public_domain_at', as_date, required=False),
-        Field( DCNS('contributor.editor'), 'editors', \
-            as_person, salias='editor', multiple=True, default=[]),
-        Field( DCNS('contributor.translator'), 'translators', \
-            as_person,  salias='translator', multiple=True, default=[]),
-        Field( DCNS('contributor.technical_editor'), 'technical_editors',
-            as_person, salias='technical_editor', multiple=True, default=[]),
         Field( DCNS('publisher'), 'publisher'),
         Field( DCNS('publisher'), 'publisher'),
+
         Field( DCNS('source'), 'source_name', required=False),
         Field( DCNS('source.URL'), 'source_url', required=False),
         Field( DCNS('identifier.url'), 'url', WLURI),
         Field( DCNS('source'), 'source_name', required=False),
         Field( DCNS('source.URL'), 'source_url', required=False),
         Field( DCNS('identifier.url'), 'url', WLURI),
-        Field( DCNS('relation.hasPart'), 'parts', WLURI, multiple=True, required=False),
-        Field( DCNS('rights.license'), 'license', required=False),
-        Field( DCNS('rights'), 'license_description'),
-        Field( DCNS('language'), 'language'),
-        Field( DCNS('description'), 'description', required=False),
-    )
+        )
 
     @classmethod
     def from_string(cls, xml):
 
     @classmethod
     def from_string(cls, xml):
@@ -186,7 +198,7 @@ class BookInfo(object):
     def from_element(cls, rdf_tag):
         # the tree is already parsed, so we don't need to worry about Expat errors
         field_dict = {}
     def from_element(cls, rdf_tag):
         # the tree is already parsed, so we don't need to worry about Expat errors
         field_dict = {}
-        desc = rdf_tag.find(".//" + RDFNS('Description') )
+        desc = rdf_tag.find(".//" + RDFNS('Description'))
 
         if desc is None:
             raise NoDublinCore("No DublinCore section found.")
 
         if desc is None:
             raise NoDublinCore("No DublinCore section found.")
@@ -196,7 +208,7 @@ class BookInfo(object):
             fv.append(e.text)
             field_dict[e.tag] = fv
 
             fv.append(e.text)
             field_dict[e.tag] = fv
 
-        return cls( desc.attrib, field_dict )
+        return cls(desc.attrib, field_dict)
 
     def __init__(self, rdf_attrs, dc_fields):
         """rdf_attrs should be a dictionary-like object with any attributes of the RDF:Description.
 
     def __init__(self, rdf_attrs, dc_fields):
         """rdf_attrs should be a dictionary-like object with any attributes of the RDF:Description.
@@ -283,7 +295,6 @@ class BookInfo(object):
 
         return root
 
 
         return root
 
-
     def serialize(self):
         rdf = {}
         rdf['about'] = { 'uri': RDFNS('about'), 'value': self.about }
     def serialize(self):
         rdf = {}
         rdf['about'] = { 'uri': RDFNS('about'), 'value': self.about }
@@ -321,5 +332,24 @@ class BookInfo(object):
 
         return result
 
 
         return result
 
-def parse(file_name):
-    return BookInfo.from_file(file_name)
+
+class BookInfo(WorkInfo):
+    FIELDS = (
+        Field( DCNS('audience'), 'audiences', salias='audience', multiple=True,
+                required=False),
+        Field( DCNS('contributor.editor'), 'editors', \
+            as_person, salias='editor', multiple=True, default=[]),
+        Field( DCNS('contributor.translator'), 'translators', \
+            as_person,  salias='translator', multiple=True, default=[]),
+        Field( DCNS('contributor.technical_editor'), 'technical_editors',
+            as_person, salias='technical_editor', multiple=True, default=[]),
+        Field( DCNS('relation.hasPart'), 'parts', WLURI, multiple=True, required=False),
+        Field( DCNS('rights.license'), 'license', required=False),
+        Field( DCNS('rights'), 'license_description'),
+        Field( DCNS('language'), 'language'),
+        Field( DCNS('description'), 'description', required=False),
+    )
+
+
+def parse(file_name, cls=BookInfo):
+    return cls.from_file(file_name)
diff --git a/librarian/picture.py b/librarian/picture.py
new file mode 100644 (file)
index 0000000..7830528
--- /dev/null
@@ -0,0 +1,151 @@
+
+from dcparser import (as_person, as_date, Field, WorkInfo, DCNS)
+from librarian import (RDFNS, ValidationError, NoDublinCore, ParseError, WLURI)
+from xml.parsers.expat import ExpatError
+from os import path
+from StringIO import StringIO
+from lxml import etree
+from lxml.etree import (XMLSyntaxError, XSLTApplyError)
+import re
+
+
+class WLPictureURI(WLURI):
+    _re_wl_uri = re.compile('http://wolnelektury.pl/katalog/obraz/'
+            '(?P<slug>[-a-z0-9]+)(/(?P<lang>[a-z]{3}))?/?$')
+
+    def __init__(self, *args, **kw):
+        super(WLPictureURI, self).__init__(*args, **kw)
+
+    @classmethod
+    def from_slug_and_lang(cls, slug, lang):
+        uri = 'http://wolnelektury.pl/katalog/obraz/%s/' % slug
+        return cls(uri)
+
+    def filename_stem(self):
+        return self.slug
+
+
+class PictureInfo(WorkInfo):
+    """
+    Dublin core metadata for a picture
+    """
+    FIELDS = (
+        Field(DCNS('format.dimensions.digital'), 'dimensions', required=False),
+        Field(DCNS('format.dimensions.original'), 'dimensions_original', required=False),
+        Field(DCNS('format.physical'), 'physical', required=False),
+        Field(DCNS('format'), 'mime_type', required=False),
+        Field(DCNS('identifier.url'), 'url', WLPictureURI),
+        )
+
+    def validate(self):
+        """
+        WorkInfo has a language validation code only, which we do not need.
+        """
+        pass
+    
+
+class ImageStore(object):
+    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_):
+        self.dir = dir_
+        return super(ImageStore, self).__init__()
+
+    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(object):
+    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
+
+    @classmethod
+    def from_string(cls, xml, *args, **kwargs):
+        return cls.from_file(StringIO(xml), *args, **kwargs)
+
+    @classmethod
+    def from_file(cls, xmlfile, parse_dublincore=True, image_store=None):
+
+        # first, prepare for parsing
+        if isinstance(xmlfile, basestring):
+            file = open(xmlfile, 'rb')
+            try:
+                data = file.read()
+            finally:
+                file.close()
+        else:
+            data = xmlfile.read()
+
+        if not isinstance(data, unicode):
+            data = data.decode('utf-8')
+
+        data = data.replace(u'\ufeff', '')
+
+        # assume images are in the same directory
+        if image_store is None and xmlfile.name is not None:
+            image_store = ImageStore(path.dirname(xmlfile.name))
+
+        try:
+            parser = etree.XMLParser(remove_blank_text=False)
+            tree = etree.parse(StringIO(data.encode('utf-8')), parser)
+
+            return cls(tree, parse_dublincore=parse_dublincore, image_store=image_store)
+        except (ExpatError, XMLSyntaxError, XSLTApplyError), 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, *args, **kwargs)
diff --git a/tests/files/picture/angelus-novus.png b/tests/files/picture/angelus-novus.png
new file mode 100644 (file)
index 0000000..9925dad
Binary files /dev/null and b/tests/files/picture/angelus-novus.png differ
diff --git a/tests/files/picture/angelus-novus.xml b/tests/files/picture/angelus-novus.xml
new file mode 100644 (file)
index 0000000..ae2afbc
--- /dev/null
@@ -0,0 +1,36 @@
+<picture>
+  <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
+    <rdf:Description rdf:about="http://wiki.wolnepodreczniki.pl/Lektury:Andersen/Brzydkie_kaczątko">
+      <dc:creator xml:lang="pl">Klee, Paul</dc:creator>
+      <dc:title xml:lang="la">Angelus Novus</dc:title>
+      <dc:publisher xml:lang="pl">Fundacja Nowoczesna Polska</dc:publisher>
+      <dc:subject.period xml:lang="pl">Modernizm</dc:subject.period>
+      <dc:subject.type xml:lang="pl">Obraz</dc:subject.type>
+      <dc:subject.genre xml:lang="pl">Akwarela</dc:subject.genre>
+      <dc:description xml:lang="pl">Publikacja zrealizowana w ramach projektu Wolne Lektury (http://wolnelektury.pl). Reprodukcja cyfrowa wykonana przez Bibliotekę Narodową z egzemplarza pochodzącego ze zbiorów BN.</dc:description>
+      <dc:identifier.url xml:lang="pl">http://wolnelektury.pl/katalog/obraz/angelus-novus</dc:identifier.url>
+      <dc:source.URL xml:lang="pl">http://katilifox.files.wordpress.com/2011/04/1190051611_angelus-novus.jpg</dc:source.URL>
+      <dc:source xml:lang="pl"></dc:source>
+      <dc:rights xml:lang="pl">Domena publiczna - Paul Klee zm. 1940</dc:rights>
+      <dc:date.pd xml:lang="pl">1940</dc:date.pd>
+      <dc:type>Image</dc:type>
+      <dc:format xml:lang="pl">image/png</dc:format>
+      <dc:format.dimensions.digital xml:lang="pl">1645 x 2000 px</dc:format.dimensions.digital>
+      <dc:format.dimensions.original xml:lang="pl">31.8 × 24.2 cm</dc:format.dimensions.original>
+      <dc:format.physical xml:lang="pl">Akwarela na papierze</dc:format.physical>
+      <dc:date xml:lang="pl">1920</dc:date>
+    </rdf:Description>
+  </rdf:RDF>
+
+  <sem type="motif" motif="anioł historii">
+    <div type="area" x1="462" y1="212" x2="1283" y2="1730"/>
+  </sem>
+  <sem type="motif" motif="spojrzenie">
+    <div type="area" x1="688" y1="500" x2="1054" y2="618"/>
+  </sem>
+  <sem type="motif" motif="skrzydło">
+    <div type="area" x1="468" y1="741" x2="694" y2="1027"/>
+    <div type="area" x1="1044" y1="762" x2="1260" y2="1041"/>
+  </sem>
+</picture>
diff --git a/tests/test_picture.py b/tests/test_picture.py
new file mode 100644 (file)
index 0000000..4e3b252
--- /dev/null
@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+#
+# This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
+#
+from librarian import picture, dcparser
+from lxml import etree
+from nose.tools import *
+from os.path import splitext
+from tests.utils import get_all_fixtures, get_fixture
+import codecs
+from os import path
+
+def test_wlpictureuri():
+    uri = picture.WLPictureURI('http://wolnelektury.pl/katalog/obraz/angelus-novus')
+
+def check_load(xml_file):
+    pi = dcparser.parse(xml_file, picture.PictureInfo)
+    assert pi is not None
+    assert isinstance(pi, picture.PictureInfo)
+    
+
+def test_load():
+    for fixture in get_all_fixtures('picture', '*.xml'):
+        yield check_load, fixture
+
+
+def test_wlpicture():
+    wlp = picture.WLPicture.from_file(open(get_fixture('picture', 'angelus-novus.xml')))
+    pi = wlp.picture_info
+
+    #    from nose.tools import set_trace; set_trace()
+    assert pi.type[0] == u"Image"
+    assert pi.mime_type == u'image/png' == wlp.mime_type
+    assert wlp.slug == 'angelus-novus'
+
+    assert path.exists(wlp.image_path)
+    
+    f = wlp.image_file('r')
+    f.close()