// UnmarshalError unmarshals a response error for the REST JSON protocol.
func UnmarshalError(r *service.Request) {
	code := r.HTTPResponse.Header.Get("X-Amzn-Errortype")
	bodyBytes, err := ioutil.ReadAll(r.HTTPResponse.Body)
	if err != nil {
		r.Error = awserr.New("SerializationError", "failed reading REST JSON error response", err)
		return
	}
	if len(bodyBytes) == 0 {
		r.Error = awserr.NewRequestFailure(
			awserr.New("SerializationError", r.HTTPResponse.Status, nil),
			r.HTTPResponse.StatusCode,
			"",
		)
		return
	}
	var jsonErr jsonErrorResponse
	if err := json.Unmarshal(bodyBytes, &jsonErr); err != nil {
		r.Error = awserr.New("SerializationError", "failed decoding REST JSON error response", err)
		return
	}

	if code == "" {
		code = jsonErr.Code
	}

	codes := strings.SplitN(code, ":", 2)
	r.Error = awserr.NewRequestFailure(
		awserr.New(codes[0], jsonErr.Message, nil),
		r.HTTPResponse.StatusCode,
		"",
	)
}

func TestConvertFromListError(t *testing.T) {
	// Test that we get an error using ConvertFromList to convert to a map.
	var actual map[string]interface{}
	expected := awserr.New("SerializationError", `v must be a non-nil pointer to an array or slice, got *map[string]interface {}`, nil).Error()
	if err := ConvertFromList(nil, &actual); err == nil {
		t.Errorf("ConvertFromList with input %#v returned no error, expected error `%s`", nil, expected)
	} else if err.Error() != expected {
		t.Errorf("ConvertFromList with input %#v returned error `%s`, expected error `%s`", nil, err, expected)
	}

	// Test that we get an error using ConvertFromList to convert to a struct.
	var actual2 myComplexStruct
	expected = awserr.New("SerializationError", `v must be a non-nil pointer to an array or slice, got *dynamodbattribute.myComplexStruct`, nil).Error()
	if err := ConvertFromList(nil, &actual2); err == nil {
		t.Errorf("ConvertFromList with input %#v returned no error, expected error `%s`", nil, expected)
	} else if err.Error() != expected {
		t.Errorf("ConvertFromList with input %#v returned error `%s`, expected error `%s`", nil, err, expected)
	}

	// Test that we get an error using ConvertFromList to convert to an interface{}.
	var actual3 interface{}
	expected = awserr.New("SerializationError", `v must be a non-nil pointer to an array or slice, got *interface {}`, nil).Error()
	if err := ConvertFromList(nil, &actual3); err == nil {
		t.Errorf("ConvertFromList with input %#v returned no error, expected error `%s`", nil, expected)
	} else if err.Error() != expected {
		t.Errorf("ConvertFromList with input %#v returned error `%s`, expected error `%s`", nil, err, expected)
	}
}

func unmarshalError(req *Request) {
	bodyBytes, err := ioutil.ReadAll(req.HTTPResponse.Body)
	if err != nil {
		req.Error = awserr.New("UnmarshaleError", req.HTTPResponse.Status, err)
		return
	}
	if len(bodyBytes) == 0 {
		req.Error = awserr.NewRequestFailure(
			awserr.New("UnmarshaleError", req.HTTPResponse.Status, fmt.Errorf("empty body")),
			req.HTTPResponse.StatusCode,
			"",
		)
		return
	}
	var jsonErr jsonErrorResponse
	if err := json.Unmarshal(bodyBytes, &jsonErr); err != nil {
		req.Error = awserr.New("UnmarshaleError", "JSON unmarshal", err)
		return
	}
	req.Error = awserr.NewRequestFailure(
		awserr.New(jsonErr.Code, jsonErr.Message, nil),
		req.HTTPResponse.StatusCode,
		"",
	)
}

func TestAfterRetryRefreshCreds(t *testing.T) {
	os.Clearenv()
	credProvider := &mockCredsProvider{}
	svc := NewService(&aws.Config{Credentials: credentials.NewCredentials(credProvider), MaxRetries: aws.Int(1)})

	svc.Handlers.Clear()
	svc.Handlers.ValidateResponse.PushBack(func(r *Request) {
		r.Error = awserr.New("UnknownError", "", nil)
		r.HTTPResponse = &http.Response{StatusCode: 400}
	})
	svc.Handlers.UnmarshalError.PushBack(func(r *Request) {
		r.Error = awserr.New("ExpiredTokenException", "", nil)
	})
	svc.Handlers.AfterRetry.PushBack(func(r *Request) {
		AfterRetryHandler(r)
	})

	assert.True(t, svc.Config.Credentials.IsExpired(), "Expect to start out expired")
	assert.False(t, credProvider.retrieveCalled)

	req := NewRequest(svc, &Operation{Name: "Operation"}, nil, nil)
	req.Send()

	assert.True(t, svc.Config.Credentials.IsExpired())
	assert.False(t, credProvider.retrieveCalled)

	_, err := svc.Config.Credentials.Get()
	assert.NoError(t, err)
	assert.True(t, credProvider.retrieveCalled)
}

// UnmarshalError unmarshals an error response for a JSON RPC service.
func UnmarshalError(req *service.Request) {
	defer req.HTTPResponse.Body.Close()
	bodyBytes, err := ioutil.ReadAll(req.HTTPResponse.Body)
	if err != nil {
		req.Error = awserr.New("SerializationError", "failed reading JSON RPC error response", err)
		return
	}
	if len(bodyBytes) == 0 {
		req.Error = awserr.NewRequestFailure(
			awserr.New("SerializationError", req.HTTPResponse.Status, nil),
			req.HTTPResponse.StatusCode,
			"",
		)
		return
	}
	var jsonErr jsonErrorResponse
	if err := json.Unmarshal(bodyBytes, &jsonErr); err != nil {
		req.Error = awserr.New("SerializationError", "failed decoding JSON RPC error response", err)
		return
	}

	codes := strings.SplitN(jsonErr.Code, "#", 2)
	req.Error = awserr.NewRequestFailure(
		awserr.New(codes[len(codes)-1], jsonErr.Message, nil),
		req.HTTPResponse.StatusCode,
		"",
	)
}

// loadProfiles loads from the file pointed to by shared credentials filename for profile.
// The credentials retrieved from the profile will be returned or error. Error will be
// returned if it fails to read from the file, or the data is invalid.
func loadProfile(filename, profile string) (Value, error) {
	config, err := ini.LoadFile(filename)
	if err != nil {
		return Value{}, awserr.New("SharedCredsLoad", "failed to load shared credentials file", err)
	}
	iniProfile := config.Section(profile)

	id, ok := iniProfile["aws_access_key_id"]
	if !ok {
		return Value{}, awserr.New("SharedCredsAccessKey",
			fmt.Sprintf("shared credentials %s in %s did not contain aws_access_key_id", profile, filename),
			nil)
	}

	secret, ok := iniProfile["aws_secret_access_key"]
	if !ok {
		return Value{}, awserr.New("SharedCredsSecret",
			fmt.Sprintf("shared credentials %s in %s did not contain aws_secret_access_key", profile, filename),
			nil)
	}

	token := iniProfile["aws_session_token"]

	return Value{
		AccessKeyID:     id,
		SecretAccessKey: secret,
		SessionToken:    token,
	}, nil
}

func unmarshalError(r *service.Request) {
	defer r.HTTPResponse.Body.Close()

	if r.HTTPResponse.ContentLength == int64(0) {
		// No body, use status code to generate an awserr.Error
		r.Error = awserr.NewRequestFailure(
			awserr.New(strings.Replace(r.HTTPResponse.Status, " ", "", -1), r.HTTPResponse.Status, nil),
			r.HTTPResponse.StatusCode,
			"",
		)
		return
	}

	resp := &xmlErrorResponse{}
	err := xml.NewDecoder(r.HTTPResponse.Body).Decode(resp)
	if err != nil && err != io.EOF {
		r.Error = awserr.New("SerializationError", "failed to decode S3 XML error response", nil)
	} else {
		r.Error = awserr.NewRequestFailure(
			awserr.New(resp.Code, resp.Message, nil),
			r.HTTPResponse.StatusCode,
			"",
		)
	}
}

func TestChainProviderWithNoValidProvider(t *testing.T) {
	p := &ChainProvider{
		Providers: []Provider{
			&stubProvider{err: awserr.New("FirstError", "first provider error", nil)},
			&stubProvider{err: awserr.New("SecondError", "second provider error", nil)},
		},
	}

	assert.True(t, p.IsExpired(), "Expect expired with no providers")
	_, err := p.Retrieve()
	assert.Equal(t, ErrNoValidProvidersFoundInChain, err, "Expect no providers error returned")
}

// UnmarshalError unmarshals a response error for the EC2 protocol.
func UnmarshalError(r *service.Request) {
	defer r.HTTPResponse.Body.Close()

	resp := &xmlErrorResponse{}
	err := xml.NewDecoder(r.HTTPResponse.Body).Decode(resp)
	if err != nil && err != io.EOF {
		r.Error = awserr.New("SerializationError", "failed decoding EC2 Query error response", err)
	} else {
		r.Error = awserr.NewRequestFailure(
			awserr.New(resp.Code, resp.Message, nil),
			r.HTTPResponse.StatusCode,
			resp.RequestID,
		)
	}
}

// SendHandler is a request handler to send service request using HTTP client.
func SendHandler(r *Request) {
	var err error
	r.HTTPResponse, err = r.Service.Config.HTTPClient.Do(r.HTTPRequest)
	if err != nil {
		// Capture the case where url.Error is returned for error processing
		// response. e.g. 301 without location header comes back as string
		// error and r.HTTPResponse is nil. Other url redirect errors will
		// comeback in a similar method.
		if e, ok := err.(*url.Error); ok {
			if s := reStatusCode.FindStringSubmatch(e.Error()); s != nil {
				code, _ := strconv.ParseInt(s[1], 10, 64)
				r.HTTPResponse = &http.Response{
					StatusCode: int(code),
					Status:     http.StatusText(int(code)),
					Body:       ioutil.NopCloser(bytes.NewReader([]byte{})),
				}
				return
			}
		}
		if r.HTTPResponse == nil {
			// Add a dummy request response object to ensure the HTTPResponse
			// value is consistent.
			r.HTTPResponse = &http.Response{
				StatusCode: int(0),
				Status:     http.StatusText(int(0)),
				Body:       ioutil.NopCloser(bytes.NewReader([]byte{})),
			}
		}
		// Catch all other request errors.
		r.Error = awserr.New("RequestError", "send request failed", err)
		r.Retryable = aws.Bool(true) // network errors are retryable
	}
}

// Build builds a JSON payload for a JSON RPC request.
func Build(req *service.Request) {
	var buf []byte
	var err error
	if req.ParamsFilled() {
		buf, err = jsonutil.BuildJSON(req.Params)
		if err != nil {
			req.Error = awserr.New("SerializationError", "failed encoding JSON RPC request", err)
			return
		}
	} else {
		buf = emptyJSON
	}

	if req.Service.TargetPrefix != "" || string(buf) != "{}" {
		req.SetBufferBody(buf)
	}

	if req.Service.TargetPrefix != "" {
		target := req.Service.TargetPrefix + "." + req.Operation.Name
		req.HTTPRequest.Header.Add("X-Amz-Target", target)
	}
	if req.Service.JSONVersion != "" {
		jsonVersion := req.Service.JSONVersion
		req.HTTPRequest.Header.Add("Content-Type", "application/x-amz-json-"+jsonVersion)
	}
}

// Retrieve retrieves credentials from the EC2 service.
// Error will be returned if the request fails, or unable to extract
// the desired credentials.
func (m *EC2RoleProvider) Retrieve() (credentials.Value, error) {
	if m.Client == nil {
		m.Client = ec2metadata.New(nil)
	}

	credsList, err := requestCredList(m.Client)
	if err != nil {
		return credentials.Value{}, err
	}

	if len(credsList) == 0 {
		return credentials.Value{}, awserr.New("EmptyEC2RoleList", "empty EC2 Role list", nil)
	}
	credsName := credsList[0]

	roleCreds, err := requestCred(m.Client, credsName)
	if err != nil {
		return credentials.Value{}, err
	}

	m.SetExpiration(roleCreds.Expiration, m.ExpiryWindow)

	return credentials.Value{
		AccessKeyID:     roleCreds.AccessKeyID,
		SecretAccessKey: roleCreds.SecretAccessKey,
		SessionToken:    roleCreds.Token,
	}, nil
}

func buildHeader(r *service.Request, v reflect.Value, name string) {
	str, err := convertType(v)
	if err != nil {
		r.Error = awserr.New("SerializationError", "failed to encode REST request", err)
	} else if str != nil {
		r.HTTPRequest.Header.Add(name, *str)
	}
}

func buildQueryString(r *service.Request, v reflect.Value, name string, query url.Values) {
	str, err := convertType(v)
	if err != nil {
		r.Error = awserr.New("SerializationError", "failed to encode REST request", err)
	} else if str != nil {
		query.Set(name, *str)
	}
}

// requestCredList requests a list of credentials from the EC2 service.
// If there are no credentials, or there is an error making or receiving the request
func requestCredList(client *ec2metadata.Client) ([]string, error) {
	resp, err := client.GetMetadata(iamSecurityCredsPath)
	if err != nil {
		return nil, awserr.New("EC2RoleRequestError", "failed to list EC2 Roles", err)
	}

	credsList := []string{}
	s := bufio.NewScanner(strings.NewReader(resp))
	for s.Scan() {
		credsList = append(credsList, s.Text())
	}

	if err := s.Err(); err != nil {
		return nil, awserr.New("SerializationError", "failed to read list of EC2 Roles", err)
	}

	return credsList, nil
}

func unmarshalError(r *service.Request) {
	defer r.HTTPResponse.Body.Close()
	_, err := ioutil.ReadAll(r.HTTPResponse.Body)
	if err != nil {
		r.Error = awserr.New("SerializationError", "unable to unmarshal EC2 metadata error respose", err)
	}

	// TODO extract the error...
}

// Unmarshal unmarshals a response for a JSON RPC service.
func Unmarshal(req *service.Request) {
	defer req.HTTPResponse.Body.Close()
	if req.DataFilled() {
		err := jsonutil.UnmarshalJSON(req.Data, req.HTTPResponse.Body)
		if err != nil {
			req.Error = awserr.New("SerializationError", "failed decoding JSON RPC response", err)
		}
	}
	return
}

func unmarshalHandler(r *service.Request) {
	defer r.HTTPResponse.Body.Close()
	b, err := ioutil.ReadAll(r.HTTPResponse.Body)
	if err != nil {
		r.Error = awserr.New("SerializationError", "unable to unmarshal EC2 metadata respose", err)
	}

	data := r.Data.(*metadataOutput)
	data.Content = string(b)
}

func TestConvertFromMapError(t *testing.T) {
	// Test that we get an error using ConvertFromMap to convert to an interface{}.
	var actual interface{}
	expected := awserr.New("SerializationError", `v must be a non-nil pointer to a map[string]interface{} or struct, got *interface {}`, nil).Error()
	if err := ConvertFromMap(nil, &actual); err == nil {
		t.Errorf("ConvertFromMap with input %#v returned no error, expected error `%s`", nil, expected)
	} else if err.Error() != expected {
		t.Errorf("ConvertFromMap with input %#v returned error `%s`, expected error `%s`", nil, err, expected)
	}

	// Test that we get an error using ConvertFromMap to convert to a slice.
	var actual2 []interface{}
	expected = awserr.New("SerializationError", `v must be a non-nil pointer to a map[string]interface{} or struct, got *[]interface {}`, nil).Error()
	if err := ConvertFromMap(nil, &actual2); err == nil {
		t.Errorf("ConvertFromMap with input %#v returned no error, expected error `%s`", nil, expected)
	} else if err.Error() != expected {
		t.Errorf("ConvertFromMap with input %#v returned error `%s`, expected error `%s`", nil, err, expected)
	}
}

// internal logic for deciding whether to upload a single part or use a
// multipart upload.
func (u *uploader) upload() (*UploadOutput, error) {
	u.init()

	if u.opts.PartSize < MinUploadPartSize {
		msg := fmt.Sprintf("part size must be at least %d bytes", MinUploadPartSize)
		return nil, awserr.New("ConfigError", msg, nil)
	}

	// Do one read to determine if we have more than one part
	buf, err := u.nextReader()
	if err == io.EOF || err == io.ErrUnexpectedEOF { // single part
		return u.singlePart(buf)
	} else if err != nil {
		return nil, awserr.New("ReadRequestBody", "read upload data failed", err)
	}

	mu := multiuploader{uploader: u}
	return mu.upload(buf)
}