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auth.go
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auth.go
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package salesforce
import (
"encoding/json"
"errors"
"io"
"net/http"
"net/url"
"strings"
)
type authentication struct {
AccessToken string `json:"access_token"`
InstanceUrl string `json:"instance_url"`
Id string `json:"id"`
TokenType string `json:"token_type"`
Scope string `json:"scope"`
IssuedAt string `json:"issued_at"`
Signature string `json:"signature"`
grantType string
creds Creds
}
type Creds struct {
Domain string
Username string
Password string
SecurityToken string
ConsumerKey string
ConsumerSecret string
AccessToken string
}
const (
grantTypeUsernamePassword = "password"
grantTypeClientCredentials = "client_credentials"
grantTypeAccessToken = "access_token"
)
func validateAuth(sf Salesforce) error {
if sf.auth == nil || sf.auth.AccessToken == "" {
return errors.New("not authenticated: please use salesforce.Init()")
}
return nil
}
func validateSession(auth authentication) error {
if err := validateAuth(Salesforce{auth: &auth}); err != nil {
return err
}
_, err := doRequest(&auth, requestPayload{
method: http.MethodGet,
uri: "/limits",
content: jsonType,
})
if err != nil {
return err
}
return nil
}
func refreshSession(auth *authentication) error {
var refreshedAuth *authentication
var err error
switch grantType := auth.grantType; grantType {
case grantTypeClientCredentials:
refreshedAuth, err = clientCredentialsFlow(
auth.InstanceUrl,
auth.creds.ConsumerKey,
auth.creds.ConsumerSecret,
)
case grantTypeUsernamePassword:
refreshedAuth, err = usernamePasswordFlow(
auth.InstanceUrl,
auth.creds.Username,
auth.creds.Password,
auth.creds.SecurityToken,
auth.creds.ConsumerKey,
auth.creds.ConsumerSecret,
)
default:
return errors.New("invalid session, unable to refresh session")
}
if err != nil {
return err
}
if refreshedAuth == nil {
return errors.New("missing refresh auth")
}
auth.AccessToken = refreshedAuth.AccessToken
auth.IssuedAt = refreshedAuth.IssuedAt
auth.Signature = refreshedAuth.Signature
auth.Id = refreshedAuth.Id
return nil
}
func doAuth(url string, body *strings.Reader) (*authentication, error) {
resp, err := http.Post(url, "application/x-www-form-urlencoded", body)
if err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
return nil, errors.New(string(resp.Status) + ":" + " failed authentication")
}
respBody, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
auth := &authentication{}
jsonError := json.Unmarshal(respBody, &auth)
if jsonError != nil {
return nil, jsonError
}
defer resp.Body.Close()
return auth, nil
}
func usernamePasswordFlow(domain string, username string, password string, securityToken string, consumerKey string, consumerSecret string) (*authentication, error) {
payload := url.Values{
"grant_type": {grantTypeUsernamePassword},
"client_id": {consumerKey},
"client_secret": {consumerSecret},
"username": {username},
"password": {password + securityToken},
}
endpoint := "/services/oauth2/token"
body := strings.NewReader(payload.Encode())
auth, err := doAuth(domain+endpoint, body)
if err != nil {
return nil, err
}
auth.grantType = grantTypeUsernamePassword
return auth, nil
}
func clientCredentialsFlow(domain string, consumerKey string, consumerSecret string) (*authentication, error) {
payload := url.Values{
"grant_type": {grantTypeClientCredentials},
"client_id": {consumerKey},
"client_secret": {consumerSecret},
}
endpoint := "/services/oauth2/token"
body := strings.NewReader(payload.Encode())
auth, err := doAuth(domain+endpoint, body)
if err != nil {
return nil, err
}
auth.grantType = grantTypeClientCredentials
return auth, nil
}
func setAccessToken(domain string, accessToken string) (*authentication, error) {
auth := &authentication{InstanceUrl: domain, AccessToken: accessToken}
if err := validateSession(*auth); err != nil {
return nil, err
}
auth.grantType = grantTypeAccessToken
return auth, nil
}