// Hash returns the requested hash of a file as a lowercase hex string
func (o *Object) Hash(r fs.HashType) (string, error) {
// Check that the underlying file hasn't changed
oldtime := o.info.ModTime()
oldsize := o.info.Size()
err := o.lstat()
if err != nil {
return "", errors.Wrap(err, "hash: failed to stat")
}
if !o.info.ModTime().Equal(oldtime) || oldsize != o.info.Size() {
o.hashes = nil
}
if o.hashes == nil {
o.hashes = make(map[fs.HashType]string)
in, err := os.Open(o.path)
if err != nil {
return "", errors.Wrap(err, "hash: failed to open")
}
o.hashes, err = fs.HashStream(in)
closeErr := in.Close()
if err != nil {
return "", errors.Wrap(err, "hash: failed to read")
}
if closeErr != nil {
return "", errors.Wrap(closeErr, "hash: failed to close")
}
}
return o.hashes[r], nil
}
func TestHashStream(t *testing.T) {
for _, test := range hashTestSet {
sums, err := fs.HashStream(bytes.NewBuffer(test.input))
if err != nil {
t.Fatal(err)
}
for k, v := range sums {
expect, ok := test.output[k]
if !ok {
t.Errorf("Unknown hash type %v, sum: %q", k, v)
}
if expect != v {
t.Errorf("hash %v mismatch %q != %q", k, v, expect)
}
}
// Test that all are present
for k, v := range test.output {
expect, ok := sums[k]
if !ok {
t.Errorf("did not calculate hash type %v, sum: %q", k, v)
}
if expect != v {
t.Errorf("hash %v mismatch %q != %q", k, v, expect)
}
}
}
}
func TestHashStream(t *testing.T) {
for _, test := range hashTestSet {
sums, err := fs.HashStream(bytes.NewBuffer(test.input))
require.NoError(t, err)
for k, v := range sums {
expect, ok := test.output[k]
require.True(t, ok)
assert.Equal(t, v, expect)
}
// Test that all are present
for k, v := range test.output {
expect, ok := sums[k]
require.True(t, ok)
assert.Equal(t, v, expect)
}
}
}
// Hash returns the requested hash of a file as a lowercase hex string
func (o *Object) Hash(r fs.HashType) (string, error) {
// Check that the underlying file hasn't changed
oldtime := o.info.ModTime()
oldsize := o.info.Size()
err := o.lstat()
if err != nil {
fs.Stats.Error()
fs.ErrorLog(o, "Failed to stat: %s", err)
return "", err
}
if !o.info.ModTime().Equal(oldtime) || oldsize != o.info.Size() {
o.hashes = nil
}
if o.hashes == nil {
o.hashes = make(map[fs.HashType]string)
in, err := os.Open(o.path)
if err != nil {
fs.Stats.Error()
fs.ErrorLog(o, "Failed to open: %s", err)
return "", err
}
o.hashes, err = fs.HashStream(in)
closeErr := in.Close()
if err != nil {
fs.Stats.Error()
fs.ErrorLog(o, "Failed to read: %s", err)
return "", err
}
if closeErr != nil {
fs.Stats.Error()
fs.ErrorLog(o, "Failed to close: %s", closeErr)
return "", closeErr
}
}
return o.hashes[r], nil
}