mirror of https://github.com/harness/drone.git
94 lines
2.3 KiB
Go
94 lines
2.3 KiB
Go
// Copyright 2023 Harness, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package parser
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import (
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"bytes"
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"context"
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"errors"
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"regexp"
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"strconv"
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"github.com/rs/zerolog/log"
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)
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// LfsPointerMaxSize is the maximum size for an LFS pointer file.
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// This is used to identify blobs that are too large to be valid LFS pointers.
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// lfs-pointer specification ref: https://github.com/git-lfs/git-lfs/blob/master/docs/spec.md#the-pointer
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const LfsPointerMaxSize = 200
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const lfsPointerVersionPrefix = "version https://git-lfs.github.com/spec"
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type LFSPointer struct {
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OID string
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Size int64
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}
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var (
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regexLFSOID = regexp.MustCompile(`(?m)^oid sha256:([a-f0-9]{64})$`)
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regexLFSSize = regexp.MustCompile(`(?m)^size (\d+)+$`)
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ErrInvalidLFSPointer = errors.New("invalid lfs pointer")
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)
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func GetLFSObjectID(content []byte) (string, error) {
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if !bytes.HasPrefix(content, []byte(lfsPointerVersionPrefix)) {
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return "", ErrInvalidLFSPointer
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}
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oidMatch := regexLFSOID.FindSubmatch(content)
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if oidMatch == nil {
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return "", ErrInvalidLFSPointer
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}
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if !regexLFSSize.Match(content) {
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return "", ErrInvalidLFSPointer
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}
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return string(oidMatch[1]), nil
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}
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func IsLFSPointer(
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ctx context.Context,
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content []byte,
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size int64,
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) (*LFSPointer, bool) {
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if size > LfsPointerMaxSize {
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return nil, false
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}
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if !bytes.HasPrefix(content, []byte(lfsPointerVersionPrefix)) {
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return nil, false
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}
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oidMatch := regexLFSOID.FindSubmatch(content)
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if oidMatch == nil {
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return nil, false
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}
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sizeMatch := regexLFSSize.FindSubmatch(content)
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if sizeMatch == nil {
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return nil, false
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}
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contentSize, err := strconv.ParseInt(string(sizeMatch[1]), 10, 64)
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if err != nil {
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log.Ctx(ctx).Warn().Err(err).Msgf("failed to parse lfs pointer size for object ID %s", oidMatch[1])
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return nil, false
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}
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return &LFSPointer{OID: string(oidMatch[1]), Size: contentSize}, true
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}
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