/
updatepackage.go
89 lines (70 loc) · 1.62 KB
/
updatepackage.go
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package server
import (
"bytes"
"errors"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"github.com/UpdateHub/updatehub/libarchive"
)
type UpdatePackage struct {
updateMetadata []byte
signature []byte
file *os.File
}
func NewUpdatePackage(f *os.File) (*UpdatePackage, error) {
updateMetadata, signature, err := parseUpdatePackage(f)
if err != nil {
return nil, err
}
return &UpdatePackage{
updateMetadata: updateMetadata,
signature: signature,
file: f,
}, nil
}
func fetchUpdatePackage(target *url.URL) (*UpdatePackage, error) {
res, err := http.Get(target.String())
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
return nil, errors.New("failed")
}
out, err := ioutil.TempFile("", "uhupkg")
if err != nil {
return nil, err
}
defer out.Close()
_, err = io.Copy(out, res.Body)
if err != nil {
return nil, err
}
return NewUpdatePackage(out)
}
func parseUpdatePackage(f *os.File) ([]byte, []byte, error) {
la := libarchive.LibArchive{}
reader, err := libarchive.NewReader(la, f.Name(), 10240)
if err != nil {
return nil, nil, err
}
defer reader.Free()
metadataBuff := bytes.NewBuffer(nil)
err = reader.ExtractFile("metadata", metadataBuff)
if err != nil {
return nil, nil, err
}
reader, err = libarchive.NewReader(la, f.Name(), 10240)
if err != nil {
return metadataBuff.Bytes(), nil, err
}
signatureBuff := bytes.NewBuffer(nil)
err = reader.ExtractFile("signature", signatureBuff)
if err != nil {
return metadataBuff.Bytes(), nil, err
}
return metadataBuff.Bytes(), signatureBuff.Bytes(), nil
}