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# Copyright (C) 2007, One Laptop Per Child
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import os.path
import urlparse
from xpcom.nsError import *
from xpcom import COMException
from xpcom import components
from xpcom.components import interfaces
class DocumentNode:
def __init__(self, DOM_node, web_navigation):
self._DOM_node = DOM_node
self._image_element = None
self._image_name = None
self._image_mime_type = None
self._image_properties = None
self._web_navigation = web_navigation
def is_image(self):
if self._image_element:
return True
if self._DOM_node.nodeType == interfaces.nsIDOMNode.ELEMENT_NODE:
element = self._DOM_node.queryInterface(interfaces.nsIDOMHTMLElement)
if element.localName.lower() == "img":
self._image_element = element.queryInterface(
interfaces.nsIDOMHTMLImageElement)
return True
return False
def _get_image_properties(self):
if not self.is_image():
return None
if not self._image_properties:
cls = components.classes['@mozilla.org/network/simple-uri;1']
uri = cls.createInstance(interfaces.nsIURI)
uri.spec = self._image_element.src
cls = components.classes['@mozilla.org/image/cache;1']
image_cache = cls.getService(interfaces.imgICache)
self._image_properties = image_cache.findEntryProperties(uri)
return self._image_properties
def get_image_mime_type(self):
if not self.is_image():
return None
if not self._image_mime_type:
properties = self._get_image_properties()
self._image_mime_type = properties.get('type',
interfaces.nsISupportsCString).data
return self._image_mime_type
def get_image_name(self):
if not self.is_image():
return None
if not self._image_name:
properties = self._get_image_properties()
if properties.has('content-disposition'):
content_disposition = properties.get('content-disposition',
interfaces.nsISupportsCString).data
cls = components.classes['@mozilla.org/network/mime-hdrparam;1']
header_param = cls.getService(interfaces.nsIMIMEHeaderParam)
self._image_name = header_param.getParameter(content_disposition,
'filename', '', True, None)
if not self._image_name:
self._image_name = header_param.getParameter(content_disposition,
'name', '', True, None)
if not self._image_name:
url = urlparse.urlparse(self._image_element.src)
path = url[2]
self._image_name = os.path.split(path)[1]
return self._image_name
def save_image(self, file_path):
""" Based on nsWebBrowserPersist::OnDataAvailable:
http://lxr.mozilla.org/seamonkey/source/embedding/components/webbrowserpersist/src/nsWebBrowserPersist.cpp
"""
cls = components.classes['@mozilla.org/network/io-service;1']
io_service = cls.getService(interfaces.nsIIOService)
uri = io_service.newURI(self._image_element.src, None, None)
cls = components.classes['@mozilla.org/file/local;1']
dest_file = cls.createInstance(interfaces.nsILocalFile)
dest_file.initWithPath(file_path)
cls = components.classes['@mozilla.org/network/io-service;1']
io_service = cls.getService(interfaces.nsIIOService)
input_channel = io_service.newChannelFromURI(uri)
session_history = self._web_navigation.sessionHistory
entry = session_history.getEntryAtIndex(session_history.index, False)
entry = entry.queryInterface(interfaces.nsISHEntry)
post_data = entry.postData
if post_data:
http_channel = input_channel.queryInterface(interfaces.nsIHttpChannel)
stream = post_data.queryInterface(interfaces.nsISeekableStream)
stream.seek(interfaces.nsISeekableStream.NS_SEEK_SET, 0)
upload_channel = http_channel.queryInterface(interfaces.nsIUploadChannel)
upload_channel.setUploadStream(post_data, '', -1)
http_input_stream = input_channel.open()
cls = components.classes['@mozilla.org/network/file-output-stream;1']
file_output_stream = cls.createInstance(interfaces.nsIFileOutputStream)
file_output_stream.init(dest_file, -1, -1, 0)
buf = str(http_input_stream.read(8192))
while buf:
bytes_read = len(buf)
print "bytes_read %i" % bytes_read
bytes_to_write = bytes_read
while bytes_to_write:
bytes_written = file_output_stream.write(buf, bytes_read)
print "bytes_written %i" % bytes_written
bytes_to_write -= bytes_written
buf = str(http_input_stream.read(8192))
http_input_stream.close()
file_output_stream.close()
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