From 25af49b6c63e1c005129856e107143864ad5b245 Mon Sep 17 00:00:00 2001
From: Jan Szejko <janek37@gmail.com>
Date: Fri, 9 Dec 2016 16:05:27 +0100
Subject: [PATCH] epub covers

---
 librarian/__init__.py                     | 11 ++++---
 librarian/formats/cover/__init__.py       | 16 ++++++----
 librarian/formats/cover/evens/__init__.py | 36 +++++++++++++++++++++++
 librarian/formats/epub/__init__.py        |  9 +++---
 librarian/formats/epub/res/cover.html     |  4 +--
 5 files changed, 60 insertions(+), 16 deletions(-)
 create mode 100644 librarian/formats/cover/evens/__init__.py

diff --git a/librarian/__init__.py b/librarian/__init__.py
index 0616f23..02464ef 100644
--- a/librarian/__init__.py
+++ b/librarian/__init__.py
@@ -3,7 +3,6 @@
 # This file is part of Librarian, licensed under GNU Affero GPLv3 or later.
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
-import os
 import re
 import urllib
 from .utils import XMLNamespace
@@ -23,13 +22,19 @@ class UnicodeException(Exception):
             message = unicode(args, encoding='utf-8', errors='ignore')
         return message
 
+
 class ParseError(UnicodeException):
     pass
 
+
 class ValidationError(UnicodeException):
     pass
 
 
+class BuildError(Exception):
+    pass
+
+
 class EmptyNamespace(XMLNamespace):
     def __init__(self):
         super(EmptyNamespace, self).__init__('')
@@ -53,8 +58,7 @@ class WLURI(object):
     slug = None
 
     example = 'http://wolnelektury.pl/katalog/lektura/template/'
-    _re_wl_uri = re.compile(r'http://(www\.)?wolnelektury.pl/katalog/lektura/'
-            '(?P<slug>[-a-z0-9]+)/?$')
+    _re_wl_uri = re.compile(r'http://(www\.)?wolnelektury.pl/katalog/lektura/(?P<slug>[-a-z0-9]+)/?$')
 
     def __init__(self, uri):
         uri = unicode(uri)
@@ -93,4 +97,3 @@ class WLURI(object):
 class URLOpener(urllib.FancyURLopener):
     version = 'FNP Librarian (http://git.nowoczesnapolska.org.pl/?p=librarian.git)'
 urllib._urlopener = URLOpener()
-
diff --git a/librarian/formats/cover/__init__.py b/librarian/formats/cover/__init__.py
index 7a787e8..b9b515a 100644
--- a/librarian/formats/cover/__init__.py
+++ b/librarian/formats/cover/__init__.py
@@ -126,6 +126,7 @@ class Cover(Format):
 
     logo_bottom = None
     logo_width = None
+    logo_file = get_resource('res/wl-logo.png')
     uses_dc_cover = False
 
     format = 'JPEG'
@@ -164,14 +165,17 @@ class Cover(Format):
 
         if self.background_img:
             background = Image.open(self.background_img)
-            img.paste(background, None, background)
-            del background
+            resized = background.resize((1024, background.height*1024/background.width), Image.ANTIALIAS)
+            resized = resized.convert('RGBA')
+            img.paste(resized, (0, 0), resized)
+            del background, resized
 
-        # WL logo
         if metr.logo_width:
-            logo = Image.open(get_resource('res/wl-logo.png'))
-            logo = logo.resize((metr.logo_width, logo.size[1] * metr.logo_width / logo.size[0]))
-            img.paste(logo, ((metr.width - metr.logo_width) / 2, img.size[1] - logo.size[1] - metr.logo_bottom))
+            logo = Image.open(self.logo_file)
+            logo = logo.resize((metr.logo_width, logo.size[1] * metr.logo_width / logo.size[0]), Image.ANTIALIAS)
+            logo = logo.convert('RGBA')
+            img.paste(logo, ((metr.width - metr.logo_width) / 2,
+                             img.size[1] - logo.size[1] - metr.logo_bottom), logo)
 
         top = metr.author_top
         tbox = TextBox(
diff --git a/librarian/formats/cover/evens/__init__.py b/librarian/formats/cover/evens/__init__.py
new file mode 100644
index 0000000..4207d46
--- /dev/null
+++ b/librarian/formats/cover/evens/__init__.py
@@ -0,0 +1,36 @@
+# -*- 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.
+#
+import urllib
+from urllib2 import urlopen, URLError
+
+from librarian import DCNS, BuildError
+from .. import Cover
+
+
+class EvensCover(Cover):
+    format_name = u"Evens cover image"
+    width = 1024
+    height = 1365
+    author_top = 900
+    title_top = 30
+    logo_bottom = 100
+
+    def __init__(self, doc, format=None, width=None, height=None):
+        super(EvensCover, self).__init__(doc, format=format, width=width, height=height)
+        self.doc = doc
+
+    def set_images(self, ctx):
+        cover_url = self.doc.meta.get(DCNS('relation.coverimage.url'))[0]
+        if cover_url.startswith('file://'):
+            cover_url = ctx.files_path + urllib.quote(cover_url[7:])
+        try:
+            self.background_img = urlopen(cover_url)
+        except URLError:
+            raise BuildError('Cannot open the cover image: %s' % cover_url)
+
+        if getattr(ctx, 'cover_logo', None):
+            self.logo_width = 150
+            self.logo_file = urlopen(ctx.cover_logo)
diff --git a/librarian/formats/epub/__init__.py b/librarian/formats/epub/__init__.py
index b9d1c7a..bf21a6f 100644
--- a/librarian/formats/epub/__init__.py
+++ b/librarian/formats/epub/__init__.py
@@ -15,7 +15,7 @@ from lxml import etree
 from librarian import OPFNS, NCXNS, XHTMLNS, DCNS
 from librarian import core
 from librarian.formats import Format
-from librarian.formats.cover.wolnelektury import WLCover
+from librarian.formats.cover.evens import EvensCover
 from librarian.output import OutputFile
 from librarian.renderers import Register, TreeRenderer, UnknownElement
 from librarian.utils import Context, get_resource, extend_element
@@ -25,7 +25,7 @@ class EpubFormat(Format):
     format_name = 'EPUB'
     format_ext = 'epub'
 
-    cover = WLCover
+    cover = EvensCover
     renderers = Register()
 
     def __init__(self, doc, cover=None, with_fonts=True):
@@ -79,8 +79,9 @@ class EpubFormat(Format):
         # nav_map = toc_file[-1]
 
         if self.cover is not None:
-            cover_image = self.doc.meta.get(DCNS('relation.coverimage.url'))[0]
+            # cover_image = self.doc.meta.get(DCNS('relation.coverimage.url'))[0]
             cover = self.cover(self.doc)
+            cover.set_images(ctx)
             cover_output = cover.build()
             cover_name = 'cover.%s' % cover.format_ext
             zip.writestr(os.path.join('OPS', cover_name), cover_output.get_string())
@@ -117,7 +118,7 @@ class EpubFormat(Format):
 
         wrap_tmpl = etree.parse(get_resource('formats/epub/res/chapter.html'))
         for e in self.render(self.doc.edoc.getroot(), ctx):
-            if not len(e) and not e.text.strip():
+            if not len(e) and not (e.text and e.text.strip()):
                 continue
             wrap = deepcopy(wrap_tmpl)
             extend_element(wrap.find('//*[@id="book-text"]'), e)
diff --git a/librarian/formats/epub/res/cover.html b/librarian/formats/epub/res/cover.html
index 784067c..3233201 100644
--- a/librarian/formats/epub/res/cover.html
+++ b/librarian/formats/epub/res/cover.html
@@ -2,12 +2,12 @@
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
     <meta http-equiv="Content-Type" content="application/xhtml+xml; charset=utf-8" />
-    <title>Okładka</title>
+    <title>Cover</title>
     <style type="text/css"> img { max-width: 100%; } </style>
   </head>
   <body style="oeb-column-number: 1;">
     <div id="cover-image">
-      <img alt="Okładka" />
+      <img alt="Cover" />
     </div>
   </body>
 </html>
\ No newline at end of file
-- 
2.20.1