mirror of https://github.com/harness/drone.git
128 lines
3.2 KiB
Go
128 lines
3.2 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 types
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import (
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"errors"
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"fmt"
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"github.com/harness/gitness/registry/app/store/database/util"
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"github.com/opencontainers/go-digest"
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)
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// Digest is the database representation of a digest, stored in the format `<algorithm prefix><hex>`.
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type Digest string
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const (
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// Algorithm prefixes are sequences of two digits. These should never change, only additions are allowed.
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sha256DigestAlgorithmPrefix = "01"
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sha512DigestAlgorithmPrefix = "02"
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)
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func GetDigestBytes(dgst digest.Digest) ([]byte, error) {
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if len(dgst.String()) == 0 {
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return nil, nil
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}
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newDigest, err := NewDigest(dgst)
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if err != nil {
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return nil, err
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}
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digestBytes, err := util.GetHexDecodedBytes(string(newDigest))
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if err != nil {
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return nil, err
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}
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return digestBytes, nil
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}
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// String implements the Stringer interface.
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func (d Digest) String() string {
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return string(d)
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}
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// NewDigest builds a Digest based on a digest.Digest.
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func NewDigest(d digest.Digest) (Digest, error) {
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if err := d.Validate(); err != nil {
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return "", err
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}
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var algPrefix string
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switch d.Algorithm() {
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case digest.SHA256:
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algPrefix = sha256DigestAlgorithmPrefix
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case digest.SHA512:
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algPrefix = sha512DigestAlgorithmPrefix
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case digest.SHA384:
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return "", fmt.Errorf("unimplemented algorithm %q", digest.SHA384)
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default:
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return "", fmt.Errorf("unknown algorithm %q", d.Algorithm())
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}
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return Digest(fmt.Sprintf("%s%s", algPrefix, d.Hex())), nil
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}
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// Parse maps a Digest to a digest.Digest.
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func (d Digest) Parse() (digest.Digest, error) {
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str := d.String()
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valid, err := d.validate(str)
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if !valid {
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return "", err
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}
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algPrefix := str[:2]
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if len(str) == 2 {
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return "", errors.New("no checksum")
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}
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var alg digest.Algorithm
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switch algPrefix {
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case sha256DigestAlgorithmPrefix:
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alg = digest.SHA256
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case sha512DigestAlgorithmPrefix:
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alg = digest.SHA512
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default:
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return "", fmt.Errorf("unknown algorithm prefix %q", algPrefix)
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}
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dgst := digest.NewDigestFromHex(alg.String(), str[2:])
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if err := dgst.Validate(); err != nil {
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return "", err
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}
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return dgst, nil
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}
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func (d Digest) validate(str string) (bool, error) {
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if len(str) == 0 {
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return false, nil
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}
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if len(str) < 2 {
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return false, errors.New("invalid digest length")
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}
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return true, nil
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}
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// HexDecode decodes binary data from a textual representation.
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// The output is equivalent to the PostgreSQL binary `decode` function with the hex textual format. See
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// https://www.postgresql.org/docs/14/functions-binarystring.html.
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func (d Digest) HexDecode() string {
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return fmt.Sprintf("\\x%s", d.String())
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}
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func (d Digest) Validate() string {
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return fmt.Sprintf("\\x%s", d.String())
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}
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