go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/server/auth/internal/testing.go (about)

     1  // Copyright 2015 The LUCI Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package internal
    16  
    17  import (
    18  	"bytes"
    19  	"context"
    20  	"io"
    21  	"net/http"
    22  	"sync"
    23  )
    24  
    25  var testTransportKey = "testTransport"
    26  
    27  // TestTransportCallback is used from unit tests.
    28  type TestTransportCallback func(r *http.Request, body string) (code int, response string)
    29  
    30  // WithTestTransport puts a testing transport in the context to use for fetches.
    31  func WithTestTransport(ctx context.Context, cb TestTransportCallback) context.Context {
    32  	return context.WithValue(ctx, &testTransportKey, &testTransport{cb: cb})
    33  }
    34  
    35  type testTransport struct {
    36  	lock sync.Mutex
    37  	cb   TestTransportCallback
    38  }
    39  
    40  func (t *testTransport) RoundTrip(r *http.Request) (*http.Response, error) {
    41  	t.lock.Lock()
    42  	defer t.lock.Unlock()
    43  	body, err := io.ReadAll(r.Body)
    44  	r.Body.Close()
    45  	if err != nil {
    46  		return nil, err
    47  	}
    48  	code, resp := t.cb(r, string(body))
    49  	return &http.Response{
    50  		StatusCode: code,
    51  		Body:       io.NopCloser(bytes.NewReader([]byte(resp))),
    52  	}, nil
    53  }