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// Copyright 2019, 2020 OCI Contributors
// Copyright 2017 Docker, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package digest
import (
"bytes"
"crypto/rand"
_ "crypto/sha256"
_ "crypto/sha512"
"flag"
"fmt"
"strings"
"testing"
)
func TestFlagInterface(t *testing.T) {
var (
alg Algorithm
flagSet flag.FlagSet
)
flagSet.Var(&alg, "algorithm", "set the digest algorithm")
for _, testcase := range []struct {
Name string
Args []string
Err error
Expected Algorithm
}{
{
Name: "Invalid",
Args: []string{"-algorithm", "bean"},
Err: ErrDigestUnsupported,
},
{
Name: "Default",
Args: []string{"unrelated"},
Expected: "sha256",
},
{
Name: "Other",
Args: []string{"-algorithm", "sha512"},
Expected: "sha512",
},
} {
t.Run(testcase.Name, func(t *testing.T) {
alg = Canonical
if err := flagSet.Parse(testcase.Args); err != testcase.Err {
if testcase.Err == nil {
t.Fatal("unexpected error", err)
}
// check that flag package returns correct error
if !strings.Contains(err.Error(), testcase.Err.Error()) {
t.Fatalf("unexpected error: %v != %v", err, testcase.Err)
}
return
}
if alg != testcase.Expected {
t.Fatalf("unexpected algorithm: %v != %v", alg, testcase.Expected)
}
})
}
}
func TestFroms(t *testing.T) {
p := make([]byte, 1<<20)
rand.Read(p)
for alg := range algorithms {
h := alg.Hash()
h.Write(p)
expected := Digest(fmt.Sprintf("%s:%x", alg, h.Sum(nil)))
readerDgst, err := alg.FromReader(bytes.NewReader(p))
if err != nil {
t.Fatalf("error calculating hash from reader: %v", err)
}
dgsts := []Digest{
alg.FromBytes(p),
alg.FromString(string(p)),
readerDgst,
}
if alg == Canonical {
readerDgst, err := FromReader(bytes.NewReader(p))
if err != nil {
t.Fatalf("error calculating hash from reader: %v", err)
}
dgsts = append(dgsts,
FromBytes(p),
FromString(string(p)),
readerDgst)
}
for _, dgst := range dgsts {
if dgst != expected {
t.Fatalf("unexpected digest %v != %v", dgst, expected)
}
}
}
}
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