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client.go
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client.go
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package coinpayments
import (
"context"
"crypto/hmac"
"crypto/sha512"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"strings"
"github.com/davecgh/go-spew/spew"
)
type service struct {
client *Client
}
const (
// HeaderNameHMAC is used for authentication
HeaderNameHMAC = "HMAC"
)
// Client is the coinpayments API client.
// Do not instantiate this client with Client{}. Use the New method instead.
type Client struct {
httpClient *http.Client
common service
baseURL string
apiKey string
apiSecret string
version string
ipnSecret string
Payment *paymentService
}
// New creates and returns a new Client from a slice of Option.
func New(options ...Option) *Client {
config := defaultClientConfig()
for _, option := range options {
option.apply(config)
}
client := &Client{
apiKey: config.apiKey,
version: config.version,
apiSecret: config.apiSecret,
httpClient: config.httpClient,
baseURL: config.baseURL,
ipnSecret: config.ipnSecret,
}
client.common.client = client
client.Payment = (*paymentService)(&client.common)
return client
}
// newRequest creates an API request. A relative URL can be provided in uri,
// in which case it is resolved relative to the BaseURL of the Client.
// URI's should always be specified without a preceding slash.
func (client *Client) newRequest(ctx context.Context, method, cmd string, body url.Values) (*http.Request, error) {
body.Add("cmd", cmd)
body.Add("key", client.apiKey)
body.Add("format", "json")
body.Add("version", client.version)
req, err := http.NewRequestWithContext(ctx, method, client.baseURL, strings.NewReader(body.Encode()))
if err != nil {
return nil, err
}
// generate hmac hash of data and private key
hash, err := client.computeHMAC(body.Encode(), client.apiSecret)
if err != nil {
return nil, err
}
spew.Dump(hash)
req.Header.Add(HeaderNameHMAC, hash)
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
req.Header.Add("Content-Length", strconv.Itoa(len(body.Encode())))
return req, nil
}
// do carries out an HTTP request and returns a Response
func (client *Client) do(req *http.Request) (*Response, error) {
if req == nil {
return nil, fmt.Errorf("%T cannot be nil", req)
}
httpResponse, err := client.httpClient.Do(req)
if err != nil {
return nil, err
}
defer func() { _ = httpResponse.Body.Close() }()
resp, err := client.newResponse(httpResponse)
if err != nil {
return resp, err
}
_, err = io.Copy(ioutil.Discard, httpResponse.Body)
if err != nil {
return resp, err
}
return resp, nil
}
// newResponse converts an *http.Response to *Response
func (client *Client) newResponse(httpResponse *http.Response) (*Response, error) {
if httpResponse == nil {
return nil, fmt.Errorf("%T cannot be nil", httpResponse)
}
resp := new(Response)
resp.HTTPResponse = httpResponse
buf, err := ioutil.ReadAll(resp.HTTPResponse.Body)
if err != nil {
return nil, err
}
resp.Body = &buf
return resp, resp.Error()
}
// computeHMAC returns the hmac hash of the data
func (client *Client) computeHMAC(data string, secret string) (string, error) {
hash := hmac.New(sha512.New, []byte(secret))
if _, err := hash.Write([]byte(data)); err != nil {
return "", err
}
return fmt.Sprintf("%x", hash.Sum(nil)), nil
}
// IpnHMAC returns the hmac hash of the data
func (client *Client) IpnHMAC(data string) (string, error) {
return client.computeHMAC(data, client.ipnSecret)
}