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#!/usr/bin/env python

import argparse
import atexit
import cStringIO
import os
import pycurl
import sys
import tempfile
import time

# Public artifacts BUILD-INFO.txt
build_info = 'Format-Version: 0.5\n\nFiles-Pattern: *\nLicense-Type: open\n'


class API_v1(object):
    def __init__(self, server, build_info, api_key):
        self.server = server
        self.api_base = server
        self.build_info = build_info
        self.api_key = api_key
        self.curl = pycurl.Curl()

    def __del__(self):
        self.curl.close()

    def _upload_data(self, url, data, headers=None, retry_count=3):
        response = cStringIO.StringIO()
        self.curl.setopt(pycurl.URL, url)
        self.curl.setopt(pycurl.HTTPPOST, data)
        self.curl.setopt(pycurl.WRITEFUNCTION, response.write)
        if headers:
            self.curl.setopt(pycurl.HTTPHEADER, headers)
        try:
            self.curl.perform()
        except Exception as e:
            if retry_count > 0:
                # server could be reloading or something. give it a second and
                # try again
                print('Upload failed for %s, retrying in 2 seconds' % url)
                time.sleep(2)
                return self._upload_data(url, data, headers, retry_count - 1)
            else:
                return str(e)

        code = self.curl.getinfo(pycurl.RESPONSE_CODE)
        if code not in (200, 201):
            return response.getvalue()

    def upload_file(self, url, filename):
        data = [
            ('file', (pycurl.FORM_FILE, filename)),
            ('key', (pycurl.FORM_CONTENTS, self.api_key)),
        ]
        return self._upload_data(url, data)

    def upload_transfer_queue(self, transfer_queue):
        transfer_failures = []
        for transfer_item in transfer_queue:
            failure = self.upload_file(
                transfer_item, transfer_queue[transfer_item])
            if failure:
                transfer_failures.append('%s: %s' % (transfer_item, failure))
        return transfer_failures

    def get_transfer_queue(self, src, dst):
        if self.api_base[-1] != '/' and dst[0] != '/':
            # one of these needs to be a slash to produce a url
            dst = '/' + dst

        transfer_queue = {}
        src_dir = os.path.abspath(src)

        if not os.path.isdir(src_dir):
            transfer_queue[self.api_base + dst + "/" + os.path.basename(src)] = src_dir
            return transfer_queue

        for root, dirs, files in os.walk(src_dir):
            dst_dir = dst
            if not root.endswith(dst):  # in sub directory
                dst_dir = os.path.join(dst, root[len(src_dir) + 1:])
            for f in files:
                dst_file = '%s%s/%s' % (self.api_base, dst_dir, f)
                transfer_queue[dst_file] = os.path.join(root, f)
            build_info_file = os.path.join(root, 'BUILD-INFO.txt')
            if not os.path.exists(build_info_file):
                dst_file = '%s%s/%s' % (
                    self.api_base, dst_dir, 'BUILD-INFO.txt')
                transfer_queue[dst_file] = self.build_info
        return transfer_queue

    def upload(self, src, dst):
        transfer_queue = self.get_transfer_queue(src, dst)
        if not transfer_queue:
            print "Warning: no files to publish"
        return self.upload_transfer_queue(transfer_queue)


class API_v2(API_v1):
    def __init__(self, server, build_info, api_key):
        super(API_v2, self).__init__(server, build_info, api_key)
        self.api_base = server + '/api/v2/publish/'

    def upload_file(self, url, filename):
        headers = ['AuthToken: ' + self.api_key]
        data = [('file', (pycurl.FORM_FILE, filename))]
        return self._upload_data(url, data, headers)


def main():
    parser = argparse.ArgumentParser(
        description='Copy file(s) from source to destination')
    parser.add_argument('-k', '--key', help='key used for the copy')
    parser.add_argument('-a', '--api_version', choices=('1', '2'), default='1',
                        help='API version to use. default=%(default)s')
    parser.add_argument('--server', default='http://snapshots.linaro.org/',
                        help='Publishing API server. default=%(default)s')
    parser.add_argument('-b', '--build-info', help='Custom build-info file')
    parser.add_argument('src', help='source directory with files to publish')
    parser.add_argument('dst', help='destination to publish to')

    arguments = parser.parse_args()
    # Publish key is required. Fallback to PUBLISH_KEY environment
    # variable when it isn't passed as an argument
    if arguments.key:
        key = arguments.key
    else:
        key = os.environ.get('PUBLISH_KEY')
        if key is None:
            key = os.environ.get('PUBLISH_TOKEN')
            if key:
                arguments.api_version = '2'
            else:
                sys.exit('Error: Key is not defined.')

    if not arguments.build_info:
        fd, arguments.build_info = tempfile.mkstemp(prefix='BUILD-INFO.txt')
        atexit.register(os.unlink, arguments.build_info)
        os.write(fd, build_info)

    if arguments.api_version == '1':
        api = API_v1(arguments.server, arguments.build_info, key)
    else:
        api = API_v2(arguments.server, arguments.build_info, key)

    transfer_failures = api.upload(arguments.src, arguments.dst)

    if len(transfer_failures) > 0:
        sys.exit('Error: Failed to transfer:\n  %s' % '\n  '.join(transfer_failures))


if __name__ == '__main__':
    main()