114 lines
4 KiB
Python
114 lines
4 KiB
Python
# -*- coding: iso-8859-1 -*-
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# Copyright (C) 2004-2005 Tristan Seligmann and Jonathan Jacobs
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# Copyright (C) 2012 Bastian Kleineidam
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import os
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import rfc822
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import time
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from .output import out
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from .util import getImageObject, normaliseURL, unquote, strsize, getDirname, getFilename
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from .events import getHandler
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class FetchComicError(IOError):
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"""Exception for comic fetching errors."""
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pass
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class ComicStrip(object):
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"""A list of comic image URLs."""
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def __init__(self, name, stripUrl, imageUrls, namer):
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"""Store the image URL list."""
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self.name = name
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self.stripUrl = stripUrl
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self.imageUrls = imageUrls
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self.namer = namer
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def getImages(self):
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"""Get a list of image downloaders."""
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for imageUrl in self.imageUrls:
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yield self.getDownloader(normaliseURL(imageUrl))
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def getDownloader(self, url):
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"""Get an image downloader."""
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filename = self.namer(url, self.stripUrl)
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if filename is None:
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filename = url.rsplit('/', 1)[1]
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dirname = getDirname(self.name)
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return ComicImage(self.name, url, self.stripUrl, dirname, filename)
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class ComicImage(object):
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"""A comic image downloader."""
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def __init__(self, name, url, referrer, dirname, filename):
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"""Set URL and filename."""
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self.name = name
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self.referrer = referrer
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self.url = url
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self.dirname = dirname
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filename = getFilename(filename)
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self.filename, self.ext = os.path.splitext(filename)
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def connect(self):
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"""Connect to host and get meta information."""
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try:
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self.urlobj = getImageObject(self.url, self.referrer)
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except IOError as msg:
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raise FetchComicError('Unable to retrieve URL.', self.url, msg)
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content_type = unquote(self.urlobj.headers.get('content-type'))
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content_type = content_type.split(';', 1)[0]
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if '/' in content_type:
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maintype, subtype = content_type.split('/', 1)
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else:
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maintype = content_type
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subtype = None
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if maintype != 'image' and content_type not in ('application/octet-stream', 'application/x-shockwave-flash'):
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raise FetchComicError('Content type %r is not an image.' % content_type, self.url)
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# Always use mime type for file extension if it is sane.
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if maintype == 'image':
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self.ext = '.' + subtype.replace('jpeg', 'jpg')
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self.contentLength = int(self.urlobj.headers.get('content-length', 0))
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self.lastModified = self.urlobj.headers.get('last-modified')
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out.debug('... filename = %r, ext = %r, contentLength = %d' % (self.filename, self.ext, self.contentLength))
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def touch(self, filename):
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"""Set last modified date on filename."""
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if self.lastModified:
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tt = rfc822.parsedate(self.lastModified)
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if tt:
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mtime = time.mktime(tt)
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os.utime(filename, (mtime, mtime))
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def save(self, basepath):
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"""Save comic URL to filename on disk."""
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self.connect()
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filename = "%s%s" % (self.filename, self.ext)
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comicSize = self.contentLength
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comicDir = os.path.join(basepath, self.dirname)
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if not os.path.isdir(comicDir):
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os.makedirs(comicDir)
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fn = os.path.join(comicDir, filename)
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if os.path.isfile(fn) and os.path.getsize(fn) >= comicSize:
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self.touch(fn)
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out.info('Skipping existing file "%s".' % fn)
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return fn, False
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try:
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out.debug('Writing comic to file %s...' % fn)
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with open(fn, 'wb') as comicOut:
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comicOut.write(self.urlobj.content)
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self.touch(fn)
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except Exception:
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if os.path.isfile(fn):
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os.remove(fn)
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raise
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else:
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size = strsize(os.path.getsize(fn))
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out.info("Saved %s (%s)." % (fn, size))
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getHandler().comicDownloaded(self.name, fn)
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return fn, True
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