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/* {{{ Copyright (c) Paul R. Tagliamonte <paultag@debian.org>, 2015
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE. }}} */
package control // import "pault.ag/go/debian/control"
import (
"bytes"
"crypto/sha256"
"crypto/sha512"
"encoding/hex"
"fmt"
"hash"
"io"
"log"
"path/filepath"
"strconv"
"strings"
"pault.ag/go/debian/hashio"
)
// A FileHash is an entry as found in the Files, Checksum-Sha1, and
// Checksum-Sha256 entry for the .dsc or .changes files.
type FileHash struct {
// cb136f28a8c971d4299cc68e8fdad93a8ca7daf3 1131 dput-ng_1.9.dsc
Algorithm string
Hash string
Size int64
Filename string
ByHash string
}
func FileHashFromHasher(path string, hasher hashio.Hasher) FileHash {
return FileHash{
Algorithm: hasher.Name(),
Hash: fmt.Sprintf("%x", hasher.Sum(nil)),
Size: hasher.Size(),
Filename: path,
}
}
type FileHashes []FileHash
type verifier struct {
h hash.Hash
want []byte
closed bool
}
func (v *verifier) Write(p []byte) (n int, err error) {
return v.h.Write(p)
}
func (v *verifier) Close() error {
if v.closed {
return nil
}
v.closed = true
got := v.h.Sum(nil)
if !bytes.Equal(got, v.want) {
return fmt.Errorf("invalid hash: got %x, want %x", got, v.want)
}
return nil
}
// Verifier returns an io.WriteCloser which verifies the hash of the data being
// written to it and fails Close() upon hash mismatch.
//
// Example:
// verifier := fh.Verifier()
// r = io.TeeReader(r, verifier)
// if _, err := io.Copy(f, r); err != nil {
// return err
// }
// if err := verifier.Close(); err != nil {
// return err
// }
func (c *FileHash) Verifier() (io.WriteCloser, error) {
var h hash.Hash
switch c.Algorithm {
case "sha256":
h = sha256.New()
case "sha512":
h = sha512.New()
default:
log.Fatalf("BUG: FileHash.Verifier not updated after release.Indices()")
}
sum, err := hex.DecodeString(c.Hash)
if err != nil {
return nil, err
}
return &verifier{h: h, want: sum}, nil
}
// {{{ Hash File implementations
// ByHashPath returns the corresponding /by-hash/<algorithm>/<hash> path.
// This function must only be used if the release supports AcquireByHash.
func (c *FileHash) ByHashPath(path string) string {
return filepath.Dir(path) + "/by-hash/" + c.ByHash + "/" + c.Hash
}
func (c *FileHash) marshalControl() (string, error) {
return fmt.Sprintf("%s %d %s", c.Hash, c.Size, c.Filename), nil
}
func (c *FileHash) unmarshalControl(algorithm, data string) error {
var err error
c.Algorithm = algorithm
vals := strings.Fields(data)
switch len(vals) {
case 3:
c.Hash = vals[0]
c.Size, err = strconv.ParseInt(vals[1], 10, 64)
if err != nil {
return err
}
c.Filename = vals[2]
switch algorithm {
case "sha256":
c.ByHash = "SHA256"
case "sha512":
c.ByHash = "SHA512"
}
return nil
case 2:
c.Filename = vals[0]
c.Hash = vals[1]
return nil
default:
return fmt.Errorf("Error: Unknown Debian Hash line: '%s'", data)
}
}
// {{{ MD5 FileHash
type MD5FileHash struct{ FileHash }
func (c *MD5FileHash) UnmarshalControl(data string) error {
return c.unmarshalControl("md5", data)
}
func (c MD5FileHash) MarshalControl() (string, error) {
return c.marshalControl()
}
// }}}
// {{{ SHA1 FileHash
type SHA1FileHash struct{ FileHash }
func (c *SHA1FileHash) UnmarshalControl(data string) error {
return c.unmarshalControl("sha1", data)
}
func (c SHA1FileHash) MarshalControl() (string, error) {
return c.marshalControl()
}
// }}}
// {{{ SHA256 FileHash
type SHA256FileHash struct{ FileHash }
func (c *SHA256FileHash) UnmarshalControl(data string) error {
return c.unmarshalControl("sha256", data)
}
func (c SHA256FileHash) MarshalControl() (string, error) {
return c.marshalControl()
}
// }}}
// {{{ SHA512 FileHash
type SHA512FileHash struct{ FileHash }
func (c *SHA512FileHash) UnmarshalControl(data string) error {
return c.unmarshalControl("sha512", data)
}
func (c SHA512FileHash) MarshalControl() (string, error) {
return c.marshalControl()
}
// }}}
// }}}
// vim: foldmethod=marker
|
