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// Copyright 2016 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package hash_test
import (
"bytes"
"io"
"io/ioutil"
"strings"
"github.com/juju/testing"
jc "github.com/juju/testing/checkers"
"github.com/juju/testing/filetesting"
gc "gopkg.in/check.v1"
"github.com/juju/utils/hash"
)
var _ = gc.Suite(&HashSuite{})
type HashSuite struct {
testing.IsolationSuite
}
func (s *HashSuite) TestHashingWriter(c *gc.C) {
data := "some data"
newHash, _ := hash.SHA384()
expected, err := hash.GenerateFingerprint(strings.NewReader(data), newHash)
c.Assert(err, jc.ErrorIsNil)
var writer bytes.Buffer
h := newHash()
hashingWriter := io.MultiWriter(&writer, h)
_, err = hashingWriter.Write([]byte(data))
c.Assert(err, jc.ErrorIsNil)
fp := hash.NewValidFingerprint(h)
c.Check(fp, jc.DeepEquals, expected)
c.Check(writer.String(), gc.Equals, data)
}
func (s *HashSuite) TestHashingReader(c *gc.C) {
expected := "some data"
stub := &testing.Stub{}
reader := &filetesting.StubReader{
Stub: stub,
ReturnRead: &fakeStream{
data: expected,
},
}
newHash, validate := hash.SHA384()
h := newHash()
hashingReader := io.TeeReader(reader, h)
data, err := ioutil.ReadAll(hashingReader)
c.Assert(err, jc.ErrorIsNil)
fp := hash.NewValidFingerprint(h)
hexSum := fp.Hex()
fpAgain, err := hash.ParseHexFingerprint(hexSum, validate)
c.Assert(err, jc.ErrorIsNil)
stub.CheckCallNames(c, "Read") // The EOF was mixed with the data.
c.Check(string(data), gc.Equals, expected)
c.Check(fpAgain, jc.DeepEquals, fp)
}
type fakeStream struct {
data string
pos uint64
}
func (f *fakeStream) Read(data []byte) (int, error) {
n := copy(data, f.data[f.pos:])
f.pos += uint64(n)
if f.pos >= uint64(len(f.data)) {
return n, io.EOF
}
return n, nil
}
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