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transport.go
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transport.go
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package irma
import (
"bytes"
"crypto/sha256"
"encoding/json"
"io"
"io/ioutil"
"log"
"net"
"net/http"
"path/filepath"
"strings"
"time"
"github.com/go-errors/errors"
"github.com/hashicorp/go-retryablehttp"
"github.com/sirupsen/logrus"
"github.com/privacybydesign/irmago/internal/disable_sigpipe"
"github.com/privacybydesign/irmago/internal/fs"
)
// HTTPTransport sends and receives JSON messages to a HTTP server.
type HTTPTransport struct {
Server string
client *retryablehttp.Client
headers map[string]string
}
// Logger is used for logging. If not set, init() will initialize it to logrus.StandardLogger().
var Logger *logrus.Logger
var transportlogger *log.Logger
func init() {
if Logger == nil {
Logger = logrus.StandardLogger()
}
}
// NewHTTPTransport returns a new HTTPTransport.
func NewHTTPTransport(serverURL string) *HTTPTransport {
if Logger.IsLevelEnabled(logrus.TraceLevel) {
transportlogger = log.New(Logger.WriterLevel(logrus.TraceLevel), "transport: ", 0)
} else {
transportlogger = log.New(ioutil.Discard, "", 0)
}
url := serverURL
if serverURL != "" && !strings.HasSuffix(url, "/") { // TODO fix this
url += "/"
}
// Create a transport that dials with a SIGPIPE handler (which is only active on iOS)
var innerTransport http.Transport
innerTransport.Dial = func(network, addr string) (c net.Conn, err error) {
c, err = net.Dial(network, addr)
if err != nil {
return c, err
}
if err = disable_sigpipe.DisableSigPipe(c); err != nil {
return c, err
}
return c, nil
}
client := retryablehttp.NewClient()
client.RetryMax = 3
client.RetryWaitMin = 100 * time.Millisecond
client.RetryWaitMax = 500 * time.Millisecond
client.Logger = transportlogger
client.HTTPClient = &http.Client{
Timeout: time.Second * 5,
Transport: &innerTransport,
}
return &HTTPTransport{
Server: url,
headers: map[string]string{},
client: client,
}
}
// SetHeader sets a header to be sent in requests.
func (transport *HTTPTransport) SetHeader(name, val string) {
transport.headers[name] = val
}
func (transport *HTTPTransport) request(
url string, method string, reader io.Reader, isstr bool,
) (response *http.Response, err error) {
var req retryablehttp.Request
req.Request, err = http.NewRequest(method, transport.Server+url, reader)
if err != nil {
return nil, &SessionError{ErrorType: ErrorTransport, Err: err}
}
req.Header.Set("User-Agent", "irmago")
if reader != nil {
if isstr {
req.Header.Set("Content-Type", "text/plain; charset=UTF-8")
} else {
req.Header.Set("Content-Type", "application/json; charset=UTF-8")
}
}
for name, val := range transport.headers {
req.Header.Set(name, val)
}
res, err := transport.client.Do(&req)
if err != nil {
return nil, &SessionError{ErrorType: ErrorTransport, Err: err}
}
return res, nil
}
func (transport *HTTPTransport) jsonRequest(url string, method string, result interface{}, object interface{}) error {
if method != http.MethodPost && method != http.MethodGet && method != http.MethodDelete {
panic("Unsupported HTTP method " + method)
}
if method == http.MethodGet && object != nil {
panic("Cannot GET and also post an object")
}
var isstr bool
var reader io.Reader
if object != nil {
var objstr string
if objstr, isstr = object.(string); isstr {
Logger.Trace("transport: body: ", objstr)
reader = bytes.NewBuffer([]byte(objstr))
} else {
marshaled, err := json.Marshal(object)
if err != nil {
return &SessionError{ErrorType: ErrorSerialization, Err: err}
}
Logger.Trace("transport: body: ", string(marshaled))
reader = bytes.NewBuffer(marshaled)
}
}
res, err := transport.request(url, method, reader, isstr)
if err != nil {
return err
}
if method == http.MethodDelete {
return nil
}
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return &SessionError{ErrorType: ErrorServerResponse, Err: err, RemoteStatus: res.StatusCode}
}
if res.StatusCode != 200 {
apierr := &RemoteError{}
err = json.Unmarshal(body, apierr)
if err != nil || apierr.ErrorName == "" { // Not an ApiErrorMessage
return &SessionError{ErrorType: ErrorServerResponse, RemoteStatus: res.StatusCode}
}
Logger.Tracef("transport: error: %+v", apierr)
return &SessionError{ErrorType: ErrorApi, RemoteStatus: res.StatusCode, RemoteError: apierr}
}
Logger.Tracef("transport: response: %s", string(body))
if _, resultstr := result.(*string); resultstr {
*result.(*string) = string(body)
} else {
err = UnmarshalValidate(body, result)
if err != nil {
return &SessionError{ErrorType: ErrorServerResponse, Err: err, RemoteStatus: res.StatusCode}
}
}
return nil
}
func (transport *HTTPTransport) GetBytes(url string) ([]byte, error) {
res, err := transport.request(url, http.MethodGet, nil, false)
if err != nil {
return nil, &SessionError{ErrorType: ErrorTransport, Err: err}
}
if res.StatusCode != 200 {
return nil, &SessionError{ErrorType: ErrorServerResponse, RemoteStatus: res.StatusCode}
}
b, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, &SessionError{ErrorType: ErrorServerResponse, Err: err, RemoteStatus: res.StatusCode}
}
return b, nil
}
func (transport *HTTPTransport) GetSignedFile(url string, dest string, hash ConfigurationFileHash) error {
b, err := transport.GetBytes(url)
if err != nil {
return err
}
sha := sha256.Sum256(b)
if hash != nil && !bytes.Equal(hash, sha[:]) {
return errors.Errorf("Signature over new file %s is not valid", dest)
}
if err = fs.EnsureDirectoryExists(filepath.Dir(dest)); err != nil {
return err
}
return fs.SaveFile(dest, b)
}
func (transport *HTTPTransport) GetFile(url string, dest string) error {
return transport.GetSignedFile(url, dest, nil)
}
// Post sends the object to the server and parses its response into result.
func (transport *HTTPTransport) Post(url string, result interface{}, object interface{}) error {
return transport.jsonRequest(url, http.MethodPost, result, object)
}
// Get performs a GET request and parses the server's response into result.
func (transport *HTTPTransport) Get(url string, result interface{}) error {
return transport.jsonRequest(url, http.MethodGet, result, nil)
}
// Delete performs a DELETE.
func (transport *HTTPTransport) Delete() {
_ = transport.jsonRequest("", http.MethodDelete, nil, nil)
}