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138 lines
4.4 KiB
138 lines
4.4 KiB
# -*- coding: utf-8 -*-
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# Copyright 2015 Mike Fährmann
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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import os
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import sys
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import importlib
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from . import config, extractor, text
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from .extractor.common import Message
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class DownloadManager():
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def __init__(self, opts):
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self.opts = opts
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self.modules = {}
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def add(self, url):
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job = DownloadJob(self, url)
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job.run()
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def get_downloader_module(self, scheme):
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"""Return a downloader module suitable for 'scheme'"""
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module = self.modules.get(scheme)
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if module is None:
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module = importlib.import_module(".downloader."+scheme, __package__)
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self.modules[scheme] = module
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return module
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def get_base_directory(self):
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"""Return the base-destination-directory for downloads"""
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if self.opts.dest:
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return self.opts.dest
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else:
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return config.get(("base-directory",), default="/tmp/")
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class DownloadJob():
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def __init__(self, mngr, url):
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self.mngr = mngr
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self.extractor, self.info = extractor.find(url)
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if self.extractor is None:
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return
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self.directory = mngr.get_base_directory()
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self.downloaders = {}
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self.filename_fmt = config.get(
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("extractor", self.info["category"], "filename"),
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default=self.info["filename"]
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)
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segments = config.get(
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("extractor", self.info["category"], "directory"),
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default=self.info["directory"]
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)
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self.directory_fmt = os.path.join(*segments)
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def run(self):
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"""Execute/Run the download job"""
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if self.extractor is None:
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return # TODO: error msg
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for msg in self.extractor:
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if msg[0] == Message.Url:
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self.download(msg)
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elif msg[0] == Message.Headers:
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self.get_downloader("http:").set_headers(msg[1])
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elif msg[0] == Message.Cookies:
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self.get_downloader("http:").set_cookies(msg[1])
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elif msg[0] == Message.Directory:
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self.set_directory(msg)
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elif msg[0] == Message.Version:
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if msg[1] != 1:
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raise "unsupported message-version ({}, {})".format(
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self.info.category, msg[1]
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)
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# TODO: support for multiple message versions
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def download(self, msg):
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"""Download the resource specified in 'msg'"""
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_, url, metadata = msg
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filename = text.clean_path(self.filename_fmt.format(**metadata))
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path = os.path.join(self.directory, filename)
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if os.path.exists(path):
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self.print_skip(path)
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return
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downloader = self.get_downloader(url)
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self.print_start(path)
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tries = downloader.download(url, path)
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self.print_success(path, tries)
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def set_directory(self, msg):
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"""Set and create the target directory for downloads"""
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self.directory = os.path.join(
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self.mngr.get_base_directory(),
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self.directory_fmt.format(**{
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key: text.clean_path(value) for key, value in msg[1].items()
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})
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)
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os.makedirs(self.directory, exist_ok=True)
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def get_downloader(self, url):
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"""Return, and possibly construct, a downloader suitable for 'url'"""
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pos = url.find(":")
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scheme = url[:pos] if pos != -1 else "http"
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if scheme == "https":
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scheme = "http"
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downloader = self.downloaders.get(scheme)
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if downloader is None:
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module = self.mngr.get_downloader_module(scheme)
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downloader = module.Downloader()
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self.downloaders[scheme] = downloader
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return downloader
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@staticmethod
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def print_start(path):
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"""Print a message indicating the start of a download"""
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print(path, end="")
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sys.stdout.flush()
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@staticmethod
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def print_skip(path):
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"""Print a message indicating that a download has been skipped"""
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print("\033[2m", path, "\033[0m", sep="")
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@staticmethod
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def print_success(path, tries):
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"""Print a message indicating the completion of a download"""
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if tries == 0:
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print("\r", end="")
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print("\r\033[1;32m", path, "\033[0m", sep="")
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