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media_test.go
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media_test.go
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// Copyright 2022, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package gax
import (
"bytes"
"io"
"reflect"
"testing"
)
// errReader reads out of a buffer until it is empty, then returns the specified error.
type errReader struct {
buf []byte
err error
}
func (er *errReader) Read(p []byte) (int, error) {
if len(er.buf) == 0 {
if er.err == nil {
return 0, io.EOF
}
return 0, er.err
}
n := copy(p, er.buf)
er.buf = er.buf[n:]
return n, nil
}
func TestContentSniffing(t *testing.T) {
type testCase struct {
data []byte // the data to read from the Reader
finalErr error // error to return after data has been read
wantContentType string
wantContentTypeResult bool
}
for _, tc := range []testCase{
{
data: []byte{0, 0, 0, 0},
finalErr: nil,
wantContentType: "application/octet-stream",
wantContentTypeResult: true,
},
{
data: []byte(""),
finalErr: nil,
wantContentType: "text/plain; charset=utf-8",
wantContentTypeResult: true,
},
{
data: []byte(""),
finalErr: io.ErrUnexpectedEOF,
wantContentType: "text/plain; charset=utf-8",
wantContentTypeResult: false,
},
{
data: []byte("abc"),
finalErr: nil,
wantContentType: "text/plain; charset=utf-8",
wantContentTypeResult: true,
},
{
data: []byte("abc"),
finalErr: io.ErrUnexpectedEOF,
wantContentType: "text/plain; charset=utf-8",
wantContentTypeResult: false,
},
// The following examples contain more bytes than are buffered for sniffing.
{
data: bytes.Repeat([]byte("a"), 513),
finalErr: nil,
wantContentType: "text/plain; charset=utf-8",
wantContentTypeResult: true,
},
{
data: bytes.Repeat([]byte("a"), 513),
finalErr: io.ErrUnexpectedEOF,
wantContentType: "text/plain; charset=utf-8",
wantContentTypeResult: true, // true because error is after first 512 bytes.
},
} {
er := &errReader{buf: tc.data, err: tc.finalErr}
sct := newContentSniffer(er)
// Even if was an error during the first 512 bytes, we should still be able to read those bytes.
buf, err := io.ReadAll(sct)
if !reflect.DeepEqual(buf, tc.data) {
t.Fatalf("Failed reading buffer: got: %q; want:%q", buf, tc.data)
}
if err != tc.finalErr {
t.Fatalf("Reading buffer error: got: %v; want: %v", err, tc.finalErr)
}
ct, ok := sct.ContentType()
if ok != tc.wantContentTypeResult {
t.Fatalf("Content type result got: %v; want: %v", ok, tc.wantContentTypeResult)
}
if ok && ct != tc.wantContentType {
t.Fatalf("Content type got: %q; want: %q", ct, tc.wantContentType)
}
}
}
type staticContentTyper struct {
io.Reader
}
func (sct staticContentTyper) ContentType() string {
return "static content type"
}
func TestDetermineContentType(t *testing.T) {
data := []byte("abc")
rdr := func() io.Reader {
return bytes.NewBuffer(data)
}
type testCase struct {
r io.Reader
explicitConentType string
wantContentType string
}
for _, tc := range []testCase{
{
r: rdr(),
wantContentType: "text/plain; charset=utf-8",
},
{
r: staticContentTyper{rdr()},
wantContentType: "static content type",
},
{
r: staticContentTyper{rdr()},
explicitConentType: "explicit",
wantContentType: "explicit",
},
} {
r, ctype := DetermineContentType(tc.r, tc.explicitConentType)
got, err := io.ReadAll(r)
if err != nil {
t.Fatalf("Failed reading buffer: %v", err)
}
if !reflect.DeepEqual(got, data) {
t.Fatalf("Failed reading buffer: got: %q; want:%q", got, data)
}
if ctype != tc.wantContentType {
t.Fatalf("Content type got: %q; want: %q", ctype, tc.wantContentType)
}
}
}