mirror of https://github.com/harness/drone.git
48 lines
1.3 KiB
Go
48 lines
1.3 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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"errors"
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"regexp"
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)
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const lfsPointerVersionPrefix = "version https://git-lfs.github.com/spec"
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var (
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regexLFSOID = regexp.MustCompile(`(?m)^oid sha256:([a-f0-9]{64})$`)
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regexLFSSize = regexp.MustCompile(`(?m)^size [0-9]+$`)
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ErrInvalidLFSPointer = errors.New("invalid lfs pointer")
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)
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func GetLFSOID(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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