forked from Gitlink/gitea-1156
127 lines
3.4 KiB
Go
127 lines
3.4 KiB
Go
package models
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import (
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"crypto/sha256"
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"code.gitea.io/gitea/modules/timeutil"
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)
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// LFSMetaObject stores metadata for LFS tracked files.
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type LFSMetaObject struct {
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ID int64 `xorm:"pk autoincr"`
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Oid string `xorm:"UNIQUE(s) INDEX NOT NULL"`
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Size int64 `xorm:"NOT NULL"`
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RepositoryID int64 `xorm:"UNIQUE(s) INDEX NOT NULL"`
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Existing bool `xorm:"-"`
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CreatedUnix timeutil.TimeStamp `xorm:"created"`
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}
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// Pointer returns the string representation of an LFS pointer file
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func (m *LFSMetaObject) Pointer() string {
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return fmt.Sprintf("%s\n%s%s\nsize %d\n", LFSMetaFileIdentifier, LFSMetaFileOidPrefix, m.Oid, m.Size)
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}
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// LFSTokenResponse defines the JSON structure in which the JWT token is stored.
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// This structure is fetched via SSH and passed by the Git LFS client to the server
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// endpoint for authorization.
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type LFSTokenResponse struct {
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Header map[string]string `json:"header"`
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Href string `json:"href"`
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}
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var (
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// ErrLFSObjectNotExist is returned from lfs models functions in order
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// to differentiate between database and missing object errors.
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ErrLFSObjectNotExist = errors.New("LFS Meta object does not exist")
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)
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const (
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// LFSMetaFileIdentifier is the string appearing at the first line of LFS pointer files.
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// https://github.com/git-lfs/git-lfs/blob/master/docs/spec.md
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LFSMetaFileIdentifier = "version https://git-lfs.github.com/spec/v1"
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// LFSMetaFileOidPrefix appears in LFS pointer files on a line before the sha256 hash.
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LFSMetaFileOidPrefix = "oid sha256:"
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)
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// NewLFSMetaObject stores a given populated LFSMetaObject structure in the database
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// if it is not already present.
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func NewLFSMetaObject(m *LFSMetaObject) (*LFSMetaObject, error) {
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var err error
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sess := x.NewSession()
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defer sess.Close()
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if err = sess.Begin(); err != nil {
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return nil, err
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}
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has, err := sess.Get(m)
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if err != nil {
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return nil, err
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}
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if has {
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m.Existing = true
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return m, sess.Commit()
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}
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if _, err = sess.Insert(m); err != nil {
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return nil, err
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}
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return m, sess.Commit()
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}
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// GenerateLFSOid generates a Sha256Sum to represent an oid for arbitrary content
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func GenerateLFSOid(content io.Reader) (string, error) {
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h := sha256.New()
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if _, err := io.Copy(h, content); err != nil {
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return "", err
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}
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sum := h.Sum(nil)
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return hex.EncodeToString(sum), nil
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}
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// GetLFSMetaObjectByOid selects a LFSMetaObject entry from database by its OID.
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// It may return ErrLFSObjectNotExist or a database error. If the error is nil,
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// the returned pointer is a valid LFSMetaObject.
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func (repo *Repository) GetLFSMetaObjectByOid(oid string) (*LFSMetaObject, error) {
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if len(oid) == 0 {
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return nil, ErrLFSObjectNotExist
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}
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m := &LFSMetaObject{Oid: oid, RepositoryID: repo.ID}
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has, err := x.Get(m)
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if err != nil {
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return nil, err
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} else if !has {
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return nil, ErrLFSObjectNotExist
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}
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return m, nil
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}
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// RemoveLFSMetaObjectByOid removes a LFSMetaObject entry from database by its OID.
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// It may return ErrLFSObjectNotExist or a database error.
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func (repo *Repository) RemoveLFSMetaObjectByOid(oid string) error {
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if len(oid) == 0 {
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return ErrLFSObjectNotExist
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}
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sess := x.NewSession()
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defer sess.Close()
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if err := sess.Begin(); err != nil {
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return err
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}
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m := &LFSMetaObject{Oid: oid, RepositoryID: repo.ID}
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if _, err := sess.Delete(m); err != nil {
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return err
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}
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return sess.Commit()
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}
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