##############################################################################
#
# Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
""" This module implements a portal-managed File class.  It is based on
Zope's built-in File object, but modifies the behaviour slightly to
make it more Portal-friendly.

$Id: File.py 37921 2005-08-13 20:36:17Z jens $
"""

from Globals import InitializeClass
from AccessControl import ClassSecurityInfo

from Products.CMFCore.PortalContent import PortalContent

from DublinCore import DefaultDublinCoreImpl
from permissions import View
from permissions import ModifyPortalContent


factory_type_information = (
  { 'id'             : 'File'
  , 'meta_type'      : 'Portal File'
  , 'description'    : """\
File objects can contain arbitrary downloadable files.
"""
  , 'icon'           : 'file_icon.gif'
  , 'product'        : 'CMFDefault'
  , 'factory'        : 'addFile'
  , 'immediate_view' : 'metadata_edit_form'
  , 'aliases'        : {'(Default)':'index_html',
                        'view':'file_view'}
  , 'actions'        : ( { 'id'            : 'view'
                         , 'name'          : 'View'
                         , 'action': 'string:${object_url}/file_view'
                         , 'permissions'   : (View,)
                         }
                       , { 'id'            : 'download'
                         , 'name'          : 'Download'
                         , 'action': 'string:${object_url}'
                         , 'permissions'   : (View,)
                         }
                       , { 'id'            : 'edit'
                         , 'name'          : 'Edit'
                         , 'action': 'string:${object_url}/file_edit_form'
                         , 'permissions'   : (ModifyPortalContent,)
                         }
                       , { 'id'            : 'metadata'
                         , 'name'          : 'Metadata'
                         , 'action': 'string:${object_url}/metadata_edit_form'
                         , 'permissions'   : (ModifyPortalContent,)
                         }
                       )
  }
,
)

import OFS.Image

def addFile( self
           , id
           , title=''
           , file=''
           , content_type=''
           , precondition=''
           , subject=()
           , description=''
           , contributors=()
           , effective_date=None
           , expiration_date=None
           , format='text/html'
           , language=''
           , rights=''
           ):
    """
    Add a File
    """

    # cookId sets the id and title if they are not explicity specified
    id, title = OFS.Image.cookId(id, title, file)

    self=self.this()

    # Instantiate the object and set its description.
    fobj = File( id, title, '', content_type, precondition, subject
               , description, contributors, effective_date, expiration_date
               , format, language, rights
               )
    
    # Add the File instance to self
    self._setObject(id, fobj)

    # 'Upload' the file.  This is done now rather than in the
    # constructor because the object is now in the ZODB and
    # can span ZODB objects.
    self._getOb(id).manage_upload(file)


class File( OFS.Image.File
          , PortalContent
          , DefaultDublinCoreImpl
          ):
    """
        A Portal-managed File
    """

    # The order of base classes is very significant in this case.
    # Image.File does not store it's id in it's 'id' attribute.
    # Rather, it has an 'id' method which returns the contents of the
    # instnace's __name__ attribute.  Inheriting in the other order
    # obscures this method, resulting in much pulling of hair and
    # gnashing of teeth and fraying of nerves.  Don't do it.
    #
    # Really.
    # 
    # Note that if you use getId() to retrieve an object's ID, you will avoid
    # this problem altogether. getId is the new way, accessing .id is
    # deprecated.

    __implements__ = ( PortalContent.__implements__
                     , DefaultDublinCoreImpl.__implements__
                     )
    
    meta_type='Portal File'
    effective_date = expiration_date = None
    _isDiscussable = 1
    icon = PortalContent.icon

    security = ClassSecurityInfo()

    def __init__( self
                , id
                , title=''
                , file=''
                , content_type=''
                , precondition=''
                , subject=()
                , description=''
                , contributors=()
                , effective_date=None
                , expiration_date=None
                , format=None
                , language='en-US'
                , rights=''
                ):
        OFS.Image.File.__init__( self, id, title, file
                               , content_type, precondition )

        # If no file format has been passed in, rely on what OFS.Image.File
        # detected. Unlike Images, which have code to try and pick the content
        # type out of the binary data, File objects only provide the correct
        # type if a "hint" in the form of a filename extension is given.
        if format is None:
            format = self.content_type 

        DefaultDublinCoreImpl.__init__( self, title, subject, description
                               , contributors, effective_date, expiration_date
                               , format, language, rights )

    security.declareProtected(View, 'SearchableText')
    def SearchableText(self):
        """
        SeachableText is used for full text seraches of a portal.  It
        should return a concatenation of all useful text.
        """
        return "%s %s" % (self.title, self.description)

    security.declarePrivate('manage_afterAdd')
    def manage_afterAdd(self, item, container):
        """Both of my parents have an afterAdd method"""
        OFS.Image.File.manage_afterAdd(self, item, container)
        PortalContent.manage_afterAdd(self, item, container)

    security.declarePrivate('manage_afterClone')
    def manage_afterClone(self, item):
        """Both of my parents have an afterClone method"""
        OFS.Image.File.manage_afterClone(self, item)
        PortalContent.manage_afterClone(self, item)

    security.declarePrivate('manage_beforeDelete')
    def manage_beforeDelete(self, item, container):
        """Both of my parents have a beforeDelete method"""
        PortalContent.manage_beforeDelete(self, item, container)
        OFS.Image.File.manage_beforeDelete(self, item, container)

    security.declarePrivate('_isNotEmpty')
    def _isNotEmpty(self, file):
        """ Do various checks on 'file' to try to determine non emptiness. """
        if not file:
            return 0                    # Catches None, Missing.Value, ''
        elif file and (type(file) is type('')):
            return 1
        elif getattr(file, 'filename', None):
            return 1
        elif not hasattr(file, 'read'):
            return 0
        else:
            file.seek(0,2)              # 0 bytes back from end of file
            t = file.tell()             # Report the location
            file.seek(0)                # and return pointer back to 0
            if t: return 1
            else: return 0

    security.declarePrivate('_edit')
    def _edit(self, precondition='', file=''):
        """ Perform changes for user """
        if precondition: self.precondition = precondition
        elif self.precondition: del self.precondition

        if self._isNotEmpty(file):
            self.manage_upload(file)

    security.declareProtected(ModifyPortalContent, 'edit')
    def edit(self, precondition='', file=''):
        """ Update and reindex. """
        self._edit( precondition, file )
        self.reindexObject()

    security.declareProtected(View, 'download')
    def download(self, REQUEST, RESPONSE):
        """Download this item.
        
        Calls OFS.Image.File.index_html to perform the actual transfer after
        first setting Content-Disposition to suggest a filename.
        
        This method is deprecated, use the URL of this object itself. Because
        the default view of a File object is to download, rather than view,
        this method is obsolete. Also note that certain browsers do not deal
        well with a Content-Disposition header.

        """

        RESPONSE.setHeader('Content-Disposition',
                           'attachment; filename=%s' % self.getId())
        return OFS.Image.File.index_html(self, REQUEST, RESPONSE)

    security.declareProtected(View, 'Format')
    def Format(self):
        """ Dublin Core element - resource format """
        return self.content_type

    security.declareProtected(ModifyPortalContent, 'setFormat')
    def setFormat(self, format):
        """ Dublin Core element - resource format """
        self.manage_changeProperties(content_type=format)

    security.declareProtected(ModifyPortalContent, 'PUT')
    def PUT(self, REQUEST, RESPONSE):
        """ Handle HTTP (and presumably FTP?) PUT requests """
        OFS.Image.File.PUT( self, REQUEST, RESPONSE )
        self.reindexObject()


InitializeClass(File)

