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bankid.go
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bankid.go
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package bankid
import (
"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"time"
)
const (
libraryVersion = "5.1"
defaultBaseURL = "https://appapi2.bankid.com/rp/v5.1"
userAgent = "gobankid/" + libraryVersion
mediaType = "application/json"
)
type Client struct {
BaseUrl string
UserAgent string
HTTPClient *http.Client
}
// NewCertClient returns a BankID API client with given certificates
func NewCertClient(caCertFilename string, clientCertFilename string, clientCertKeyFilename string) (*Client, error) {
t, err := NewTransport(caCertFilename, clientCertFilename, clientCertKeyFilename)
if err != nil {
return nil, err
}
c := &http.Client{
Timeout: time.Minute,
Transport: t,
}
return NewClient(c)
}
// NewClient returns a BankID API client using the given http.Client.
//
// Use this function if you want to specify your own client, else use NewCertClient.
func NewClient(httpClient *http.Client) (*Client, error) {
if httpClient == nil {
httpClient = http.DefaultClient
}
return &Client{
BaseUrl: defaultBaseURL,
UserAgent: userAgent,
HTTPClient: httpClient,
}, nil
}
type ErrorResponse struct {
// HTTP response that caused this error
Response *http.Response
ErrorCode string `json:"errorCode"`
Details string `json:"details"`
}
func (r *ErrorResponse) Error() string {
return fmt.Sprintf("%v %v: %d %v %v",
r.Response.Request.Method, r.Response.Request.URL, r.Response.StatusCode, r.Details, r.ErrorCode)
}
func (c *Client) sendReq(ctx context.Context, req *http.Request, v interface{}) error {
req = req.WithContext(ctx)
req.Header.Set("Content-Type", mediaType)
req.Header.Set("Accept", mediaType)
req.Header.Set("User-Agent", c.UserAgent)
res, err := c.HTTPClient.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
err = checkResponse(res)
if err != nil {
return err
}
if err := json.NewDecoder(res.Body).Decode(&v); err != nil {
return err
}
return nil
}
func checkResponse(r *http.Response) error {
if c := r.StatusCode; c >= 200 && c <= 299 {
return nil
}
errRes := &ErrorResponse{Response: r}
if err := json.NewDecoder(r.Body).Decode(&errRes); err != nil {
errRes.Details = "could not parse json from response"
}
return errRes
}
// NewTransport creates a http.Transport custom CA and mTLS certificate. Only the specified CA will be used.
func NewTransport(caCertFilename string, clientCertFilename string, clientCertKeyFilename string) (*http.Transport, error) {
rootCAs := x509.NewCertPool()
caCert, err := ioutil.ReadFile(caCertFilename)
if err != nil {
return nil, err
}
rootCAs.AppendCertsFromPEM(caCert)
clientCert, err := tls.LoadX509KeyPair(clientCertFilename, clientCertKeyFilename)
if err != nil {
return nil, err
}
config := &tls.Config{
RootCAs: rootCAs,
Certificates: []tls.Certificate{clientCert},
}
tr := &http.Transport{TLSClientConfig: config}
return tr, nil
}