435 lines
16 KiB
Python
435 lines
16 KiB
Python
import logging
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import json
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from functools import wraps
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from datetime import datetime
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from time import time
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from flask import make_response, request, session, Response, redirect, abort as flask_abort
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from app import storage as store, app
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from auth.auth_context import get_authenticated_user
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from auth.permissions import (ReadRepositoryPermission,
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ModifyRepositoryPermission)
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from auth.process import process_auth, extract_namespace_repo_from_session
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from auth.registry_jwt_auth import get_granted_username
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from data import model, database
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from data.interfaces.v1 import pre_oci_model as model
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from digest import checksums
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from endpoints.v1 import v1_bp
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from endpoints.decorators import anon_protect
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from util.http import abort, exact_abort
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from util.registry.filelike import SocketReader
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from util.registry import gzipstream
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from util.registry.replication import queue_storage_replication
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from util.registry.torrent import PieceHasher
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logger = logging.getLogger(__name__)
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def _finish_image(namespace, repository, image_id):
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# Checksum is ok, we remove the marker
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blob_ref = model.update_image_uploading(namespace, repository, image_id, False)
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# Send a job to the work queue to replicate the image layer.
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queue_storage_replication(namespace, blob_ref)
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def require_completion(f):
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"""This make sure that the image push correctly finished."""
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@wraps(f)
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def wrapper(namespace, repository, *args, **kwargs):
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image_id = kwargs['image_id']
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if model.is_image_uploading(namespace, repository, image_id):
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abort(400, 'Image %(image_id)s is being uploaded, retry later',
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issue='upload-in-progress', image_id=image_id)
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return f(namespace, repository, *args, **kwargs)
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return wrapper
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def set_cache_headers(f):
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"""Returns HTTP headers suitable for caching."""
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@wraps(f)
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def wrapper(*args, **kwargs):
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# Set TTL to 1 year by default
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ttl = 31536000
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expires = datetime.fromtimestamp(int(time()) + ttl)
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expires = expires.strftime('%a, %d %b %Y %H:%M:%S GMT')
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headers = {
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'Cache-Control': 'public, max-age={0}'.format(ttl),
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'Expires': expires,
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'Last-Modified': 'Thu, 01 Jan 1970 00:00:00 GMT',
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}
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if 'If-Modified-Since' in request.headers:
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response = make_response('Not modified', 304)
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response.headers.extend(headers)
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return response
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kwargs['headers'] = headers
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# Prevent the Cookie to be sent when the object is cacheable
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session.modified = False
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return f(*args, **kwargs)
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return wrapper
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@v1_bp.route('/images/<image_id>/layer', methods=['HEAD'])
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@process_auth
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@extract_namespace_repo_from_session
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@require_completion
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@set_cache_headers
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@anon_protect
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def head_image_layer(namespace, repository, image_id, headers):
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permission = ReadRepositoryPermission(namespace, repository)
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logger.debug('Checking repo permissions')
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if permission.can() or model.repository_is_public(namespace, repository):
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logger.debug('Looking up placement locations')
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locations = model.placement_locations_docker_v1(namespace, repository, image_id)
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if locations is None:
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logger.debug('Could not find any blob placement locations')
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abort(404, 'Image %(image_id)s not found', issue='unknown-image',
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image_id=image_id)
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# Add the Accept-Ranges header if the storage engine supports resumable
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# downloads.
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extra_headers = {}
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if store.get_supports_resumable_downloads(locations):
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logger.debug('Storage supports resumable downloads')
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extra_headers['Accept-Ranges'] = 'bytes'
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resp = make_response('')
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resp.headers.extend(headers)
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resp.headers.extend(extra_headers)
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return resp
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abort(403)
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@v1_bp.route('/images/<image_id>/layer', methods=['GET'])
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@process_auth
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@extract_namespace_repo_from_session
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@require_completion
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@set_cache_headers
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@anon_protect
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def get_image_layer(namespace, repository, image_id, headers):
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permission = ReadRepositoryPermission(namespace, repository)
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logger.debug('Checking repo permissions')
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if permission.can() or model.repository_is_public(namespace, repository):
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logger.debug('Looking up placement locations and path')
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locations, path = model.placement_locations_and_path_docker_v1(namespace, repository, image_id)
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if not locations or not path:
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abort(404, 'Image %(image_id)s not found', issue='unknown-image',
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image_id=image_id)
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try:
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logger.debug('Looking up the direct download URL for path: %s', path)
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direct_download_url = store.get_direct_download_url(locations, path)
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if direct_download_url:
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logger.debug('Returning direct download URL')
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resp = redirect(direct_download_url)
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return resp
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# Close the database handle here for this process before we send the long download.
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database.close_db_filter(None)
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logger.debug('Streaming layer data')
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return Response(store.stream_read(locations, path), headers=headers)
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except (IOError, AttributeError):
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logger.exception('Image layer data not found')
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abort(404, 'Image %(image_id)s not found', issue='unknown-image',
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image_id=image_id)
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abort(403)
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@v1_bp.route('/images/<image_id>/layer', methods=['PUT'])
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@process_auth
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@extract_namespace_repo_from_session
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@anon_protect
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def put_image_layer(namespace, repository, image_id):
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logger.debug('Checking repo permissions')
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permission = ModifyRepositoryPermission(namespace, repository)
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if not permission.can():
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abort(403)
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logger.debug('Retrieving image')
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if model.storage_exists(namespace, repository, image_id):
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exact_abort(409, 'Image already exists')
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v1_metadata = model.docker_v1_metadata(namespace, repository, image_id)
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if v1_metadata is None:
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abort(404)
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logger.debug('Storing layer data')
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input_stream = request.stream
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if request.headers.get('transfer-encoding') == 'chunked':
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# Careful, might work only with WSGI servers supporting chunked
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# encoding (Gunicorn)
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input_stream = request.environ['wsgi.input']
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# Create a socket reader to read the input stream containing the layer data.
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sr = SocketReader(input_stream)
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# Add a handler that copies the data into a temp file. This is used to calculate the tarsum,
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# which is only needed for older versions of Docker.
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requires_tarsum = session.get('checksum_format') == 'tarsum'
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if requires_tarsum:
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tmp, tmp_hndlr = store.temp_store_handler()
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sr.add_handler(tmp_hndlr)
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# Add a handler to compute the compressed and uncompressed sizes of the layer.
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size_info, size_hndlr = gzipstream.calculate_size_handler()
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sr.add_handler(size_hndlr)
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# Add a handler to hash the chunks of the upload for torrenting
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piece_hasher = PieceHasher(app.config['BITTORRENT_PIECE_SIZE'])
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sr.add_handler(piece_hasher.update)
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# Add a handler which computes the checksum.
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h, sum_hndlr = checksums.simple_checksum_handler(v1_metadata.compat_json)
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sr.add_handler(sum_hndlr)
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# Add a handler which computes the content checksum only
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ch, content_sum_hndlr = checksums.content_checksum_handler()
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sr.add_handler(content_sum_hndlr)
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# Stream write the data to storage.
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locations, path = model.placement_locations_and_path_docker_v1(namespace, repository, image_id)
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with database.CloseForLongOperation(app.config):
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try:
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store.stream_write(locations, path, sr)
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except IOError:
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logger.exception('Exception when writing image data')
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abort(520, 'Image %(image_id)s could not be written. Please try again.', image_id=image_id)
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# Save the size of the image.
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model.update_image_sizes(namespace, repository, image_id, size_info.compressed_size,
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size_info.uncompressed_size)
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# Save the BitTorrent pieces.
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model.create_bittorrent_pieces(namespace, repository, image_id, piece_hasher.final_piece_hashes())
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# Append the computed checksum.
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csums = []
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csums.append('sha256:{0}'.format(h.hexdigest()))
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try:
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if requires_tarsum:
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tmp.seek(0)
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csums.append(checksums.compute_tarsum(tmp, v1_metadata.compat_json))
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tmp.close()
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except (IOError, checksums.TarError) as exc:
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logger.debug('put_image_layer: Error when computing tarsum %s', exc)
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if v1_metadata.checksum is None:
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# We don't have a checksum stored yet, that's fine skipping the check.
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# Not removing the mark though, image is not downloadable yet.
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session['checksum'] = csums
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session['content_checksum'] = 'sha256:{0}'.format(ch.hexdigest())
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return make_response('true', 200)
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# We check if the checksums provided matches one the one we computed
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if v1_metadata.checksum not in csums:
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logger.warning('put_image_layer: Wrong checksum')
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abort(400, 'Checksum mismatch; ignoring the layer for image %(image_id)s',
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issue='checksum-mismatch', image_id=image_id)
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# Mark the image as uploaded.
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_finish_image(namespace, repository, image_id)
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return make_response('true', 200)
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@v1_bp.route('/images/<image_id>/checksum', methods=['PUT'])
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@process_auth
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@extract_namespace_repo_from_session
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@anon_protect
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def put_image_checksum(namespace, repository, image_id):
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logger.debug('Checking repo permissions')
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permission = ModifyRepositoryPermission(namespace, repository)
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if not permission.can():
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abort(403)
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# Docker Version < 0.10 (tarsum+sha):
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old_checksum = request.headers.get('X-Docker-Checksum')
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# Docker Version >= 0.10 (sha):
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new_checksum = request.headers.get('X-Docker-Checksum-Payload')
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# Store whether we need to calculate the tarsum.
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if new_checksum:
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session['checksum_format'] = 'sha256'
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else:
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session['checksum_format'] = 'tarsum'
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checksum = new_checksum or old_checksum
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if not checksum:
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abort(400, "Missing checksum for image %(image_id)s", issue='missing-checksum',
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image_id=image_id)
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if not session.get('checksum'):
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abort(400, 'Checksum not found in Cookie for image %(image_id)s',
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issue='missing-checksum-cookie', image_id=image_id)
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logger.debug('Looking up repo image')
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v1_metadata = model.docker_v1_metadata(namespace, repository, image_id)
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if not v1_metadata:
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abort(404, 'Image not found: %(image_id)s', issue='unknown-image', image_id=image_id)
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logger.debug('Looking up repo layer data')
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if not v1_metadata.compat_json:
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abort(404, 'Image not found: %(image_id)s', issue='unknown-image', image_id=image_id)
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logger.debug('Marking image path')
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if not model.is_image_uploading(namespace, repository, image_id):
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abort(409, 'Cannot set checksum for image %(image_id)s',
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issue='image-write-error', image_id=image_id)
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logger.debug('Storing image and content checksums')
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content_checksum = session.get('content_checksum', None)
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checksum_parts = checksum.split(':')
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if len(checksum_parts) != 2:
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abort(400, 'Invalid checksum format')
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model.store_docker_v1_checksums(namespace, repository, image_id, checksum, content_checksum)
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if checksum not in session.get('checksum', []):
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logger.debug('session checksums: %s', session.get('checksum', []))
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logger.debug('client supplied checksum: %s', checksum)
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logger.debug('put_image_checksum: Wrong checksum')
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abort(400, 'Checksum mismatch for image: %(image_id)s',
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issue='checksum-mismatch', image_id=image_id)
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# Mark the image as uploaded.
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_finish_image(namespace, repository, image_id)
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return make_response('true', 200)
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@v1_bp.route('/images/<image_id>/json', methods=['GET'])
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@process_auth
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@extract_namespace_repo_from_session
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@require_completion
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@set_cache_headers
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@anon_protect
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def get_image_json(namespace, repository, image_id, headers):
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logger.debug('Checking repo permissions')
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permission = ReadRepositoryPermission(namespace, repository)
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if not permission.can() and not model.repository_is_public(namespace, repository):
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abort(403)
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logger.debug('Looking up repo image')
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v1_metadata = model.docker_v1_metadata(namespace, repository, image_id)
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if v1_metadata is None:
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flask_abort(404)
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logger.debug('Looking up repo layer size')
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size = model.get_image_size(namespace, repository, image_id)
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if size is not None:
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# Note: X-Docker-Size is optional and we *can* end up with a NULL image_size,
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# so handle this case rather than failing.
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headers['X-Docker-Size'] = str(size)
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response = make_response(v1_metadata.compat_json, 200)
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response.headers.extend(headers)
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return response
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@v1_bp.route('/images/<image_id>/ancestry', methods=['GET'])
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@process_auth
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@extract_namespace_repo_from_session
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@require_completion
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@set_cache_headers
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@anon_protect
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def get_image_ancestry(namespace, repository, image_id, headers):
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logger.debug('Checking repo permissions')
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permission = ReadRepositoryPermission(namespace, repository)
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if not permission.can() and not model.repository_is_public(namespace, repository):
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abort(403)
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ancestry_docker_ids = model.image_ancestry(namespace, repository, image_id)
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if ancestry_docker_ids is None:
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abort(404, 'Image %(image_id)s not found', issue='unknown-image', image_id=image_id)
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# We can not use jsonify here because we are returning a list not an object
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response = make_response(json.dumps(ancestry_docker_ids), 200)
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response.headers.extend(headers)
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return response
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@v1_bp.route('/images/<image_id>/json', methods=['PUT'])
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@process_auth
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@extract_namespace_repo_from_session
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@anon_protect
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def put_image_json(namespace, repository, image_id):
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logger.debug('Checking repo permissions')
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permission = ModifyRepositoryPermission(namespace, repository)
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if not permission.can():
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abort(403)
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logger.debug('Parsing image JSON')
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try:
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uploaded_metadata = request.data
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data = json.loads(uploaded_metadata.decode('utf8'))
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except ValueError:
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pass
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if not data or not isinstance(data, dict):
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abort(400, 'Invalid JSON for image: %(image_id)s\nJSON: %(json)s',
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issue='invalid-request', image_id=image_id, json=request.data)
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if 'id' not in data:
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abort(400, 'Missing key `id` in JSON for image: %(image_id)s',
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issue='invalid-request', image_id=image_id)
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if image_id != data['id']:
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abort(400, 'JSON data contains invalid id for image: %(image_id)s',
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issue='invalid-request', image_id=image_id)
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logger.debug('Looking up repo image')
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if not model.repository_exists(namespace, repository):
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abort(404, 'Repository does not exist: %(namespace)s/%(repository)s', issue='no-repo',
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namespace=namespace, repository=repository)
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v1_metadata = model.docker_v1_metadata(namespace, repository, image_id)
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if v1_metadata is None:
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username = get_authenticated_user() and get_authenticated_user().username
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if not username:
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username = get_granted_username()
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logger.debug('Image not found, creating or linking image with initiating user context: %s',
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username)
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location_pref = store.preferred_locations[0]
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model.create_or_link_image(username, namespace, repository, image_id, location_pref)
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v1_metadata = model.docker_v1_metadata(namespace, repository, image_id)
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# Create a temporary tag to prevent this image from getting garbage collected while the push
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# is in progress.
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model.create_temp_hidden_tag(namespace, repository, image_id,
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app.config['PUSH_TEMP_TAG_EXPIRATION_SEC'])
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parent_id = data.get('parent', None)
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if parent_id:
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logger.debug('Looking up parent image')
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if model.docker_v1_metadata(namespace, repository, parent_id) is None:
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abort(400, 'Image %(image_id)s depends on non existing parent image %(parent_id)s',
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issue='invalid-request', image_id=image_id, parent_id=parent_id)
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logger.debug('Checking if image already exists')
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if v1_metadata and not model.is_image_uploading(namespace, repository, image_id):
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exact_abort(409, 'Image already exists')
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model.update_image_uploading(namespace, repository, image_id, True)
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# If we reach that point, it means that this is a new image or a retry
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# on a failed push, save the metadata
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command_list = data.get('container_config', {}).get('Cmd', None)
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command = json.dumps(command_list) if command_list else None
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logger.debug('Setting image metadata')
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model.update_docker_v1_metadata(namespace, repository, image_id, data.get('created'),
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data.get('comment'), command, uploaded_metadata, parent_id)
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return make_response('true', 200)
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