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# -*- coding: utf-8 -*-
# Copyright 2015-2018 Mike Fährmann
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
class Message():
"""Enum for message identifiers
Extractors yield their results as message-tuples, where the first element
is one of the following identifiers. This message-identifier determines
the type and meaning of the other elements in such a tuple.
- Message.Version:
- Message protocol version (currently always '1')
- 2nd element specifies the version of all following messages as integer
- Message.Directory:
- Sets the target directory for all following images
- 2nd element is a dictionary containing general metadata
- Message.Url:
- Image URL and its metadata
- 2nd element is the URL as a string
- 3rd element is a dictionary with image-specific metadata
- Message.Headers: # obsolete
- HTTP headers to use while downloading
- 2nd element is a dictionary with header-name and -value pairs
- Message.Cookies: # obsolete
- Cookies to use while downloading
- 2nd element is a dictionary with cookie-name and -value pairs
- Message.Queue:
- (External) URL that should be handled by another extractor
- 2nd element is the (external) URL as a string
- 3rd element is a dictionary containing URL-specific metadata
- Message.Urllist: # obsolete
- Same as Message.Url, but its 2nd element is a list of multiple URLs
- The additional URLs serve as a fallback if the primary one fails
"""
Version = 1
Directory = 2
Url = 3
# Headers = 4
# Cookies = 5
Queue = 6
# Urllist = 7
Metadata = 8
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