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|
package git
import (
"bytes"
"errors"
"fmt"
"io"
"strconv"
"time"
"gopkg.in/src-d/go-git.v4/core"
)
// ErrUnsupportedObject trigger when a non-supported object is being decoded.
var ErrUnsupportedObject = errors.New("unsupported object type")
// Object is a generic representation of any git object. It is implemented by
// Commit, Tree, Blob and Tag, and includes the functions that are common to
// them.
//
// Object is returned when an object could of any type. It is frequently used
// with a type cast to acquire the specific type of object:
//
// func process(obj Object) {
// switch o := obj.(type) {
// case *Commit:
// // o is a Commit
// case *Tree:
// // o is a Tree
// case *Blob:
// // o is a Blob
// case *Tag:
// // o is a Tag
// }
// }
//
// This interface is intentionally different from core.Object, which is a lower
// level interface used by storage implementations to read and write objects.
type Object interface {
ID() core.Hash
Type() core.ObjectType
Decode(core.Object) error
Encode(core.Object) error
}
// Blob is used to store file data - it is generally a file.
type Blob struct {
Hash core.Hash
Size int64
obj core.Object
}
// ID returns the object ID of the blob. The returned value will always match
// the current value of Blob.Hash.
//
// ID is present to fulfill the Object interface.
func (b *Blob) ID() core.Hash {
return b.Hash
}
// Type returns the type of object. It always returns core.BlobObject.
//
// Type is present to fulfill the Object interface.
func (b *Blob) Type() core.ObjectType {
return core.BlobObject
}
// Decode transforms a core.Object into a Blob struct.
func (b *Blob) Decode(o core.Object) error {
if o.Type() != core.BlobObject {
return ErrUnsupportedObject
}
b.Hash = o.Hash()
b.Size = o.Size()
b.obj = o
return nil
}
// Encode transforms a Blob into a core.Object.
func (b *Blob) Encode(o core.Object) error {
w, err := o.Writer()
if err != nil {
return err
}
defer checkClose(w, &err)
r, err := b.Reader()
if err != nil {
return err
}
defer checkClose(r, &err)
_, err = io.Copy(w, r)
o.SetType(core.BlobObject)
return err
}
// Reader returns a reader allow the access to the content of the blob
func (b *Blob) Reader() (core.ObjectReader, error) {
return b.obj.Reader()
}
// Signature represents an action signed by a person
type Signature struct {
Name string
Email string
When time.Time
}
// Decode decodes a byte slice into a signature
func (s *Signature) Decode(b []byte) {
open := bytes.IndexByte(b, '<')
close := bytes.IndexByte(b, '>')
if open == -1 || close == -1 {
return
}
s.Name = string(bytes.Trim(b[:open], " "))
s.Email = string(b[open+1 : close])
hasTime := close+2 < len(b)
if hasTime {
s.decodeTimeAndTimeZone(b[close+2:])
}
}
// Encode encodes a Signature into a writer.
func (s *Signature) Encode(w io.Writer) error {
if _, err := fmt.Fprintf(w, "%s <%s> ", s.Name, s.Email); err != nil {
return err
}
if err := s.encodeTimeAndTimeZone(w); err != nil {
return err
}
return nil
}
var timeZoneLength = 5
func (s *Signature) decodeTimeAndTimeZone(b []byte) {
space := bytes.IndexByte(b, ' ')
if space == -1 {
space = len(b)
}
ts, err := strconv.ParseInt(string(b[:space]), 10, 64)
if err != nil {
return
}
s.When = time.Unix(ts, 0).In(time.UTC)
var tzStart = space + 1
if tzStart >= len(b) || tzStart+timeZoneLength > len(b) {
return
}
tl, err := time.Parse("-0700", string(b[tzStart:tzStart+timeZoneLength]))
if err != nil {
return
}
s.When = s.When.In(tl.Location())
}
func (s *Signature) encodeTimeAndTimeZone(w io.Writer) error {
_, err := fmt.Fprintf(w, "%d %s", s.When.Unix(), s.When.Format("-0700"))
return err
}
func (s *Signature) String() string {
return fmt.Sprintf("%s <%s>", s.Name, s.Email)
}
|
