307 lines
11 KiB
Python
307 lines
11 KiB
Python
import logging
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import re
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from flask import make_response, url_for, request, redirect, Response, abort as flask_abort
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from app import storage, app
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from data import model, database
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from digest import digest_tools
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from endpoints.v2 import v2_bp, require_repo_read, require_repo_write, get_input_stream
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from endpoints.v2.errors import BlobUnknown, BlobUploadInvalid, BlobUploadUnknown, Unsupported
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from auth.jwt_auth import process_jwt_auth
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from endpoints.decorators import anon_protect
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from util.cache import cache_control
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from util.registry.filelike import wrap_with_handler, StreamSlice
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from storage.basestorage import InvalidChunkException
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logger = logging.getLogger(__name__)
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BASE_BLOB_ROUTE = '/<namespace>/<repo_name>/blobs/<regex("{0}"):digest>'
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BLOB_DIGEST_ROUTE = BASE_BLOB_ROUTE.format(digest_tools.DIGEST_PATTERN)
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RANGE_HEADER_REGEX = re.compile(r'^bytes=([0-9]+)-([0-9]+)$')
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BLOB_CONTENT_TYPE = 'application/octet-stream'
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class _InvalidRangeHeader(Exception):
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pass
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def _base_blob_fetch(namespace, repo_name, digest):
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""" Some work that is common to both GET and HEAD requests. Callers MUST check for proper
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authorization before calling this method.
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"""
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try:
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found = model.blob.get_repo_blob_by_digest(namespace, repo_name, digest)
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except model.BlobDoesNotExist:
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raise BlobUnknown()
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headers = {
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'Docker-Content-Digest': digest,
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}
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# Add the Accept-Ranges header if the storage engine supports resumable
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# downloads.
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if storage.get_supports_resumable_downloads(found.locations):
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logger.debug('Storage supports resumable downloads')
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headers['Accept-Ranges'] = 'bytes'
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return found, headers
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@v2_bp.route(BLOB_DIGEST_ROUTE, methods=['HEAD'])
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@process_jwt_auth
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@require_repo_read
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@anon_protect
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@cache_control(max_age=31436000)
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def check_blob_exists(namespace, repo_name, digest):
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found, headers = _base_blob_fetch(namespace, repo_name, digest)
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response = make_response('')
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response.headers.extend(headers)
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response.headers['Content-Length'] = found.image_size
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response.headers['Content-Type'] = BLOB_CONTENT_TYPE
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return response
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@v2_bp.route(BLOB_DIGEST_ROUTE, methods=['GET'])
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@process_jwt_auth
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@require_repo_read
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@anon_protect
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@cache_control(max_age=31536000)
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def download_blob(namespace, repo_name, digest):
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found, headers = _base_blob_fetch(namespace, repo_name, digest)
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path = model.storage.get_layer_path(found)
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logger.debug('Looking up the direct download URL for path: %s', path)
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direct_download_url = storage.get_direct_download_url(found.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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resp.headers.extend(headers)
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return resp
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logger.debug('Streaming layer data')
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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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headers['Content-Length'] = found.image_size
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headers['Content-Type'] = BLOB_CONTENT_TYPE
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return Response(storage.stream_read(found.locations, path), headers=headers)
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def _render_range(num_uploaded_bytes, with_bytes_prefix=True):
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return '{0}0-{1}'.format('bytes=' if with_bytes_prefix else '', num_uploaded_bytes - 1)
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@v2_bp.route('/<namespace>/<repo_name>/blobs/uploads/', methods=['POST'])
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@process_jwt_auth
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@require_repo_write
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@anon_protect
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def start_blob_upload(namespace, repo_name):
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location_name = storage.preferred_locations[0]
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new_upload_uuid, upload_metadata = storage.initiate_chunked_upload(location_name)
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model.blob.initiate_upload(namespace, repo_name, new_upload_uuid, location_name, upload_metadata)
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digest = request.args.get('digest', None)
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if digest is None:
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# The user will send the blob data in another request
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accepted = make_response('', 202)
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accepted.headers['Location'] = url_for('v2.upload_chunk', namespace=namespace,
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repo_name=repo_name, upload_uuid=new_upload_uuid)
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accepted.headers['Range'] = _render_range(0)
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accepted.headers['Docker-Upload-UUID'] = new_upload_uuid
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return accepted
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else:
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# The user plans to send us the entire body right now
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uploaded = _upload_chunk(namespace, repo_name, new_upload_uuid)
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uploaded.save()
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return _finish_upload(namespace, repo_name, uploaded, digest)
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@v2_bp.route('/<namespace>/<repo_name>/blobs/uploads/<upload_uuid>', methods=['GET'])
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@process_jwt_auth
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@require_repo_write
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@anon_protect
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def fetch_existing_upload(namespace, repo_name, upload_uuid):
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try:
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found = model.blob.get_blob_upload(namespace, repo_name, upload_uuid)
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except model.InvalidBlobUpload:
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raise BlobUploadUnknown()
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# Note: Docker byte ranges are exclusive so we have to add one to the byte count.
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accepted = make_response('', 204)
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accepted.headers['Range'] = _render_range(found.byte_count + 1)
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accepted.headers['Docker-Upload-UUID'] = upload_uuid
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return accepted
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def _current_request_path():
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return '{0}{1}'.format(request.script_root, request.path)
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def _range_not_satisfiable(valid_end):
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invalid_range = make_response('', 416)
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invalid_range.headers['Location'] = _current_request_path()
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invalid_range.headers['Range'] = '0-{0}'.format(valid_end)
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invalid_range.headers['Docker-Upload-UUID'] = request.view_args['upload_uuid']
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flask_abort(invalid_range)
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def _parse_range_header(range_header_text):
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""" Parses the range header, and returns a tuple of the start offset and the length,
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or raises an _InvalidRangeHeader exception.
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"""
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found = RANGE_HEADER_REGEX.match(range_header_text)
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if found is None:
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raise _InvalidRangeHeader()
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start = int(found.group(1))
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length = int(found.group(2)) - start
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if length <= 0:
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raise _InvalidRangeHeader()
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return (start, length)
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def _upload_chunk(namespace, repo_name, upload_uuid):
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""" Common code among the various uploading paths for appending data to blobs.
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Callers MUST call .save() or .delete_instance() on the returned database object.
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"""
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try:
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found = model.blob.get_blob_upload(namespace, repo_name, upload_uuid)
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except model.InvalidBlobUpload:
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raise BlobUploadUnknown()
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start_offset, length = 0, -1
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range_header = request.headers.get('range', None)
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if range_header is not None:
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try:
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start_offset, length = _parse_range_header(range_header)
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except _InvalidRangeHeader:
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_range_not_satisfiable(found.byte_count)
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if start_offset > 0 and start_offset > found.byte_count:
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_range_not_satisfiable(found.byte_count)
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input_fp = get_input_stream(request)
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if start_offset > 0 and start_offset < found.byte_count:
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# Skip the bytes which were received on a previous push, which are already stored and
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# included in the sha calculation
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input_fp = StreamSlice(input_fp, found.byte_count - start_offset)
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start_offset = found.byte_count
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input_fp = wrap_with_handler(input_fp, found.sha_state.update)
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try:
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length_written, new_metadata = storage.stream_upload_chunk({found.location.name}, upload_uuid,
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start_offset, length, input_fp,
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found.storage_metadata,
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content_type=BLOB_CONTENT_TYPE)
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except InvalidChunkException:
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_range_not_satisfiable(found.byte_count)
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found.storage_metadata = new_metadata
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found.byte_count += length_written
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return found
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def _finish_upload(namespace, repo_name, upload_obj, expected_digest):
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# Verify that the digest's SHA matches that of the uploaded data.
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computed_digest = digest_tools.sha256_digest_from_hashlib(upload_obj.sha_state)
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if not digest_tools.digests_equal(computed_digest, expected_digest):
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raise BlobUploadInvalid()
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final_blob_location = digest_tools.content_path(expected_digest)
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# Move the storage into place, or if this was a re-upload, cancel it
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with database.CloseForLongOperation(app.config):
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if storage.exists({upload_obj.location.name}, final_blob_location):
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# It already existed, clean up our upload which served as proof that we had the file
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storage.cancel_chunked_upload({upload_obj.location.name}, upload_obj.uuid,
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upload_obj.storage_metadata)
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else:
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# We were the first ones to upload this image (at least to this location)
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# Let's copy it into place
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storage.complete_chunked_upload({upload_obj.location.name}, upload_obj.uuid,
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final_blob_location, upload_obj.storage_metadata)
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# Mark the blob as uploaded.
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model.blob.store_blob_record_and_temp_link(namespace, repo_name, expected_digest,
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upload_obj.location, upload_obj.byte_count,
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app.config['PUSH_TEMP_TAG_EXPIRATION_SEC'])
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# Delete the upload tracking row.
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upload_obj.delete_instance()
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response = make_response('', 201)
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response.headers['Docker-Content-Digest'] = expected_digest
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response.headers['Location'] = url_for('v2.download_blob', namespace=namespace,
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repo_name=repo_name, digest=expected_digest)
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return response
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@v2_bp.route('/<namespace>/<repo_name>/blobs/uploads/<upload_uuid>', methods=['PATCH'])
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@process_jwt_auth
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@require_repo_write
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@anon_protect
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def upload_chunk(namespace, repo_name, upload_uuid):
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upload = _upload_chunk(namespace, repo_name, upload_uuid)
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upload.save()
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accepted = make_response('', 204)
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accepted.headers['Location'] = _current_request_path()
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accepted.headers['Range'] = _render_range(upload.byte_count, with_bytes_prefix=False)
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accepted.headers['Docker-Upload-UUID'] = upload_uuid
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return accepted
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@v2_bp.route('/<namespace>/<repo_name>/blobs/uploads/<upload_uuid>', methods=['PUT'])
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@process_jwt_auth
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@require_repo_write
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@anon_protect
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def monolithic_upload_or_last_chunk(namespace, repo_name, upload_uuid):
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digest = request.args.get('digest', None)
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if digest is None:
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raise BlobUploadInvalid()
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found = _upload_chunk(namespace, repo_name, upload_uuid)
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return _finish_upload(namespace, repo_name, found, digest)
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@v2_bp.route('/<namespace>/<repo_name>/blobs/uploads/<upload_uuid>', methods=['DELETE'])
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@process_jwt_auth
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@require_repo_write
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@anon_protect
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def cancel_upload(namespace, repo_name, upload_uuid):
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try:
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found = model.blob.get_blob_upload(namespace, repo_name, upload_uuid)
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except model.InvalidBlobUpload:
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raise BlobUploadUnknown()
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# We delete the record for the upload first, since if the partial upload in
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# storage fails to delete, it doesn't break anything
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found.delete_instance()
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storage.cancel_chunked_upload({found.location.name}, found.uuid, found.storage_metadata)
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return make_response('', 204)
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@v2_bp.route('/<namespace>/<repo_name>/blobs/<digest>', methods=['DELETE'])
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@process_jwt_auth
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@require_repo_write
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@anon_protect
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def delete_digest(namespace, repo_name, upload_uuid):
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# We do not support deleting arbitrary digests, as they break repo images.
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raise Unsupported()
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