// 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 := LoadFile(filename)
if err != nil {
return Value{}, apierr.New("SharedCredsLoad", "failed to load shared credentials file", err)
}
iniProfile := config.Section(profile)
id, ok := iniProfile["aws_access_key_id"]
if !ok {
return Value{}, apierr.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{}, apierr.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(req *Request) {
bodyBytes, err := ioutil.ReadAll(req.HTTPResponse.Body)
if err != nil {
req.Error = apierr.New("UnmarshaleError", req.HTTPResponse.Status, err)
return
}
if len(bodyBytes) == 0 {
req.Error = apierr.NewRequestError(
apierr.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 = apierr.New("UnmarshaleError", "JSON unmarshal", err)
return
}
req.Error = apierr.NewRequestError(
apierr.New(jsonErr.Code, jsonErr.Message, nil),
req.HTTPResponse.StatusCode,
"",
)
}
func unmarshalError(r *aws.Request) {
defer r.HTTPResponse.Body.Close()
if r.HTTPResponse.ContentLength == int64(0) {
// No body, use status code to generate an awserr.Error
r.Error = apierr.NewRequestError(
apierr.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 = apierr.New("Unmarshal", "failed to decode S3 XML error response", nil)
} else {
r.Error = apierr.NewRequestError(
apierr.New(resp.Code, resp.Message, nil),
r.HTTPResponse.StatusCode,
"",
)
}
}
func TestAfterRetryRefreshCreds(t *testing.T) {
os.Clearenv()
credProvider := &mockCredsProvider{}
svc := NewService(&Config{Credentials: credentials.NewCredentials(credProvider), MaxRetries: 1})
svc.Handlers.Clear()
svc.Handlers.ValidateResponse.PushBack(func(r *Request) {
r.Error = apierr.New("UnknownError", "", nil)
r.HTTPResponse = &http.Response{StatusCode: 400}
})
svc.Handlers.UnmarshalError.PushBack(func(r *Request) {
r.Error = apierr.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.retreiveCalled)
req := NewRequest(svc, &Operation{Name: "Operation"}, nil, nil)
req.Send()
assert.True(t, svc.Config.Credentials.IsExpired())
assert.False(t, credProvider.retreiveCalled)
_, err := svc.Config.Credentials.Get()
assert.NoError(t, err)
assert.True(t, credProvider.retreiveCalled)
}
// UnmarshalError unmarshals an error response for a JSON RPC service.
func UnmarshalError(req *aws.Request) {
defer req.HTTPResponse.Body.Close()
bodyBytes, err := ioutil.ReadAll(req.HTTPResponse.Body)
if err != nil {
req.Error = apierr.New("Unmarshal", "failed reading JSON RPC error response", err)
return
}
if len(bodyBytes) == 0 {
req.Error = apierr.NewRequestError(
apierr.New("Unmarshal", req.HTTPResponse.Status, nil),
req.HTTPResponse.StatusCode,
"",
)
return
}
var jsonErr jsonErrorResponse
if err := json.Unmarshal(bodyBytes, &jsonErr); err != nil {
req.Error = apierr.New("Unmarshal", "failed decoding JSON RPC error response", err)
return
}
codes := strings.SplitN(jsonErr.Code, "#", 2)
req.Error = apierr.NewRequestError(
apierr.New(codes[len(codes)-1], jsonErr.Message, nil),
req.HTTPResponse.StatusCode,
"",
)
}
// UnmarshalError unmarshals a response error for the REST JSON protocol.
func UnmarshalError(r *aws.Request) {
code := r.HTTPResponse.Header.Get("X-Amzn-Errortype")
bodyBytes, err := ioutil.ReadAll(r.HTTPResponse.Body)
if err != nil {
r.Error = apierr.New("Unmarshal", "failed reading REST JSON error response", err)
return
}
if len(bodyBytes) == 0 {
r.Error = apierr.NewRequestError(
apierr.New("Unmarshal", r.HTTPResponse.Status, nil),
r.HTTPResponse.StatusCode,
"",
)
return
}
var jsonErr jsonErrorResponse
if err := json.Unmarshal(bodyBytes, &jsonErr); err != nil {
r.Error = apierr.New("Unmarshal", "failed decoding REST JSON error response", err)
return
}
if code == "" {
code = jsonErr.Code
}
codes := strings.SplitN(code, ":", 2)
r.Error = apierr.NewRequestError(
apierr.New(codes[0], jsonErr.Message, nil),
r.HTTPResponse.StatusCode,
"",
)
}
func TestChainProviderWithNoValidProvider(t *testing.T) {
p := &ChainProvider{
Providers: []Provider{
&stubProvider{err: apierr.New("FirstError", "first provider error", nil)},
&stubProvider{err: apierr.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 *aws.Request) {
defer r.HTTPResponse.Body.Close()
resp := &xmlErrorResponse{}
err := xml.NewDecoder(r.HTTPResponse.Body).Decode(resp)
if err != nil && err != io.EOF {
r.Error = apierr.New("Unmarshal", "failed decoding EC2 Query error response", err)
} else {
r.Error = apierr.NewRequestError(
apierr.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
}
}
// Catch all other request errors.
r.Error = apierr.New("RequestError", "send request failed", err)
r.Retryable.Set(true) // network errors are retryable
}
}
// 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() (Value, error) {
if m.Client == nil {
m.Client = http.DefaultClient
}
if m.Endpoint == "" {
m.Endpoint = metadataCredentialsEndpoint
}
credsList, err := requestCredList(m.Client, m.Endpoint)
if err != nil {
return Value{}, err
}
if len(credsList) == 0 {
return Value{}, apierr.New("EmptyEC2RoleList", "empty EC2 Role list", nil)
}
credsName := credsList[0]
roleCreds, err := requestCred(m.Client, m.Endpoint, credsName)
if err != nil {
return Value{}, err
}
m.expiresOn = roleCreds.Expiration
if m.ExpiryWindow > 0 {
// Offset based on expiry window if set.
m.expiresOn = m.expiresOn.Add(-m.ExpiryWindow)
}
return Value{
AccessKeyID: roleCreds.AccessKeyID,
SecretAccessKey: roleCreds.SecretAccessKey,
SessionToken: roleCreds.Token,
}, nil
}
// Build builds a JSON payload for a JSON RPC request.
func Build(req *aws.Request) {
var buf []byte
var err error
if req.ParamsFilled() {
buf, err = jsonutil.BuildJSON(req.Params)
if err != nil {
req.Error = apierr.New("Marshal", "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)
}
}
func buildQueryString(r *aws.Request, v reflect.Value, name string, query url.Values) {
str, err := convertType(v)
if err != nil {
r.Error = apierr.New("Marshal", "failed to encode REST request", err)
} else if str != nil {
query.Set(name, *str)
}
}
func buildHeader(r *aws.Request, v reflect.Value, name string) {
str, err := convertType(v)
if err != nil {
r.Error = apierr.New("Marshal", "failed to encode REST request", err)
} else if str != nil {
r.HTTPRequest.Header.Add(name, *str)
}
}
// requestCred requests the credentials for a specific credentials from the EC2 service.
//
// If the credentials cannot be found, or there is an error reading the response
// and error will be returned.
func requestCred(client *http.Client, endpoint, credsName string) (*ec2RoleCredRespBody, error) {
resp, err := client.Get(endpoint + credsName)
if err != nil {
return nil, apierr.New("GetEC2RoleCredentials",
fmt.Sprintf("failed to get %s EC2 Role credentials", credsName),
err)
}
defer resp.Body.Close()
respCreds := &ec2RoleCredRespBody{}
if err := json.NewDecoder(resp.Body).Decode(respCreds); err != nil {
return nil, apierr.New("DecodeEC2RoleCredentials",
fmt.Sprintf("failed to decode %s EC2 Role credentials", credsName),
err)
}
return respCreds, nil
}
func buildHeaderMap(r *aws.Request, v reflect.Value, prefix string) {
for _, key := range v.MapKeys() {
str, err := convertType(v.MapIndex(key))
if err != nil {
r.Error = apierr.New("Marshal", "failed to encode REST request", err)
} else if str != nil {
r.HTTPRequest.Header.Add(prefix+key.String(), *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 *http.Client, endpoint string) ([]string, error) {
resp, err := client.Get(endpoint)
if err != nil {
return nil, apierr.New("ListEC2Role", "failed to list EC2 Roles", err)
}
defer resp.Body.Close()
credsList := []string{}
s := bufio.NewScanner(resp.Body)
for s.Scan() {
credsList = append(credsList, s.Text())
}
if err := s.Err(); err != nil {
return nil, apierr.New("ReadEC2Role", "failed to read list of EC2 Roles", err)
}
return credsList, nil
}
// 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, apierr.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, apierr.New("ReadRequestBody", "read upload data failed", err)
}
mu := multiuploader{uploader: u}
return mu.upload(buf)
}
// Unmarshal unmarshals a response for a JSON RPC service.
func Unmarshal(req *aws.Request) {
defer req.HTTPResponse.Body.Close()
if req.DataFilled() {
err := jsonutil.UnmarshalJSON(req.Data, req.HTTPResponse.Body)
if err != nil {
req.Error = apierr.New("Unmarshal", "failed decoding JSON RPC response", err)
}
}
return
}
// Unmarshal unmarshals a response for an AWS Query service.
func Unmarshal(r *aws.Request) {
defer r.HTTPResponse.Body.Close()
if r.DataFilled() {
decoder := xml.NewDecoder(r.HTTPResponse.Body)
err := xmlutil.UnmarshalXML(r.Data, decoder, r.Operation.Name+"Result")
if err != nil {
r.Error = apierr.New("Unmarshal", "failed decoding Query response", err)
return
}
}
}
func buildURI(r *aws.Request, v reflect.Value, name string) {
value, err := convertType(v)
if err != nil {
r.Error = apierr.New("Marshal", "failed to encode REST request", err)
} else if value != nil {
uri := r.HTTPRequest.URL.Path
uri = strings.Replace(uri, "{"+name+"}", EscapePath(*value, true), -1)
uri = strings.Replace(uri, "{"+name+"+}", EscapePath(*value, false), -1)
r.HTTPRequest.URL.Path = uri
}
}
// Unmarshal unmarshals a payload response for the REST XML protocol.
func Unmarshal(r *aws.Request) {
if t := rest.PayloadType(r.Data); t == "structure" || t == "" {
defer r.HTTPResponse.Body.Close()
decoder := xml.NewDecoder(r.HTTPResponse.Body)
err := xmlutil.UnmarshalXML(r.Data, decoder, "")
if err != nil {
r.Error = apierr.New("Unmarshal", "failed to decode REST XML response", err)
return
}
}
}
func TestChainProviderGet(t *testing.T) {
p := &ChainProvider{
Providers: []Provider{
&stubProvider{err: apierr.New("FirstError", "first provider error", nil)},
&stubProvider{err: apierr.New("SecondError", "second provider error", nil)},
&stubProvider{
creds: Value{
AccessKeyID: "AKID",
SecretAccessKey: "SECRET",
SessionToken: "",
},
},
},
}
creds, err := p.Retrieve()
assert.Nil(t, err, "Expect no error")
assert.Equal(t, "AKID", creds.AccessKeyID, "Expect access key ID to match")
assert.Equal(t, "SECRET", creds.SecretAccessKey, "Expect secret access key to match")
assert.Empty(t, creds.SessionToken, "Expect session token to be empty")
}
// ValidateParameters is a request handler to validate the input parameters.
// Validating parameters only has meaning if done prior to the request being sent.
func ValidateParameters(r *Request) {
if r.ParamsFilled() {
v := validator{errors: []string{}}
v.validateAny(reflect.ValueOf(r.Params), "")
if count := len(v.errors); count > 0 {
format := "%d validation errors:\n- %s"
msg := fmt.Sprintf(format, count, strings.Join(v.errors, "\n- "))
r.Error = apierr.New("InvalidParameter", msg, nil)
}
}
}
// Build builds a request payload for the REST XML protocol.
func Build(r *aws.Request) {
rest.Build(r)
if t := rest.PayloadType(r.Params); t == "structure" || t == "" {
var buf bytes.Buffer
err := xmlutil.BuildXML(r.Params, xml.NewEncoder(&buf))
if err != nil {
r.Error = apierr.New("Marshal", "failed to enode rest XML request", err)
return
}
r.SetBufferBody(buf.Bytes())
}
}
// contentMD5 computes and sets the HTTP Content-MD5 header for requests that
// require it.
func contentMD5(r *aws.Request) {
h := md5.New()
// hash the body. seek back to the first position after reading to reset
// the body for transmission. copy errors may be assumed to be from the
// body.
_, err := io.Copy(h, r.Body)
if err != nil {
r.Error = apierr.New("ContentMD5", "failed to read body", err)
return
}
_, err = r.Body.Seek(0, 0)
if err != nil {
r.Error = apierr.New("ContentMD5", "failed to seek body", err)
return
}
// encode the md5 checksum in base64 and set the request header.
sum := h.Sum(nil)
sum64 := make([]byte, base64.StdEncoding.EncodedLen(len(sum)))
base64.StdEncoding.Encode(sum64, sum)
r.HTTPRequest.Header.Set("Content-MD5", string(sum64))
}
func buildGetBucketLocation(r *aws.Request) {
if r.DataFilled() {
out := r.Data.(*GetBucketLocationOutput)
b, err := ioutil.ReadAll(r.HTTPResponse.Body)
if err != nil {
r.Error = apierr.New("Unmarshal", "failed reading response body", err)
return
}
match := reBucketLocation.FindSubmatch(b)
if len(match) > 1 {
loc := string(match[1])
out.LocationConstraint = &loc
}
}
}
// Build builds a request for the EC2 protocol.
func Build(r *aws.Request) {
body := url.Values{
"Action": {r.Operation.Name},
"Version": {r.Service.APIVersion},
}
if err := queryutil.Parse(body, r.Params, true); err != nil {
r.Error = apierr.New("Marshal", "failed encoding EC2 Query request", err)
}
if r.ExpireTime == 0 {
r.HTTPRequest.Method = "POST"
r.HTTPRequest.Header.Set("Content-Type", "application/x-www-form-urlencoded; charset=utf-8")
r.SetBufferBody([]byte(body.Encode()))
} else { // This is a pre-signed request
r.HTTPRequest.Method = "GET"
r.HTTPRequest.URL.RawQuery = body.Encode()
}
}
func buildBody(r *aws.Request, v reflect.Value) {
if field, ok := v.Type().FieldByName("SDKShapeTraits"); ok {
if payloadName := field.Tag.Get("payload"); payloadName != "" {
pfield, _ := v.Type().FieldByName(payloadName)
if ptag := pfield.Tag.Get("type"); ptag != "" && ptag != "structure" {
payload := reflect.Indirect(v.FieldByName(payloadName))
if payload.IsValid() && payload.Interface() != nil {
switch reader := payload.Interface().(type) {
case io.ReadSeeker:
r.SetReaderBody(reader)
case []byte:
r.SetBufferBody(reader)
case string:
r.SetStringBody(reader)
default:
r.Error = apierr.New("Marshal",
"failed to encode REST request",
fmt.Errorf("unknown payload type %s", payload.Type()))
}
}
}
}
}
}
// ValidateResponseHandler is a request handler to validate service response.
func ValidateResponseHandler(r *Request) {
if r.HTTPResponse.StatusCode == 0 || r.HTTPResponse.StatusCode >= 300 {
// this may be replaced by an UnmarshalError handler
r.Error = apierr.New("UnknownError", "unknown error", nil)
}
}
if err, ok := r.Error.(awserr.Error); ok {
if isCodeExpiredCreds(err.Code()) {
r.Config.Credentials.Expire()
}
}
}
r.RetryCount++
r.Error = nil
}
}
var (
// ErrMissingRegion is an error that is returned if region configuration is
// not found.
ErrMissingRegion error = apierr.New("MissingRegion", "could not find region configuration", nil)
// ErrMissingEndpoint is an error that is returned if an endpoint cannot be
// resolved for a service.
ErrMissingEndpoint error = apierr.New("MissingEndpoint", "'Endpoint' configuration is required for this service", nil)
)
// ValidateEndpointHandler is a request handler to validate a request had the
// appropriate Region and Endpoint set. Will set r.Error if the endpoint or
// region is not valid.
func ValidateEndpointHandler(r *Request) {
if r.Service.SigningRegion == "" && r.Service.Config.Region == "" {
r.Error = ErrMissingRegion
} else if r.Service.Endpoint == "" {
r.Error = ErrMissingEndpoint
}