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salesforce_client.go
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salesforce_client.go
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package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"log"
"net/http"
"net/url"
"os"
"strconv"
"strings"
)
type SalesforceClient struct {
apiVersion int
clientId string
clientSecret string
password string
username string
orgUrl string
apiUrl string
token *string
}
type FetchProps struct {
body map[string]interface{}
method string
path string
}
type TokenError struct {
Error string `json:"error"`
ErrorDescription string `json:"error_description"`
}
func NewSalesforceClient() *SalesforceClient {
versionFromEnv := getEnv("API_VERSION")
var version int
if versionFromEnv != "" {
v, err := strconv.ParseInt(versionFromEnv, 10, 0)
if err != nil {
log.Panicf("invalid version %v, %v", v, err)
}
version = int(v)
} else {
version = 61
}
c := &SalesforceClient{
apiVersion: version,
clientId: getEnv("CLIENT_ID"),
clientSecret: getEnv("CLIENT_SECRET"),
password: getEnv("PASSWORD"),
username: getEnv("USERNAME"),
orgUrl: getEnv("ORG_URL"),
}
c.apiUrl = fmt.Sprintf("%v/services/data/v%v.0", c.orgUrl, c.apiVersion)
return c
}
func (c *SalesforceClient) fetch(props FetchProps) ([]byte, *int) {
var bufferBody io.Reader
if props.body != nil {
encodedBody, err := json.Marshal(props.body)
if err != nil {
log.Printf("Error converting body to JSON: %v", err)
return nil, nil
}
bufferBody = bytes.NewBuffer(encodedBody)
}
client := &http.Client{}
reqUrl := c.apiUrl + props.path
req, err := http.NewRequest(props.method, reqUrl, bufferBody)
if err != nil {
log.Printf("error on http.NewRequest: %v", err)
return nil, nil
}
token, err := c.getToken()
if err != nil {
log.Printf("error getting token %v", err)
return nil, nil
}
req.Header.Add("Content-Type", "application/json")
req.Header.Add("Authorization", "Bearer "+token)
resp, err := client.Do(req)
if err != nil {
log.Printf("error on client.Do: %v", err)
return nil, nil
}
defer resp.Body.Close()
respBody, err := io.ReadAll(resp.Body)
if err != nil {
log.Printf("error on io.ReadAll: %v", err)
return nil, &resp.StatusCode
}
fmt.Printf("status code: %v\n", resp.StatusCode)
return respBody, &resp.StatusCode
}
func (c *SalesforceClient) getToken() (string, error) {
if c.token != nil {
return *c.token, nil
}
requestUrl := fmt.Sprintf("%s/services/oauth2/token", c.orgUrl)
data := url.Values{}
data.Set("grant_type", "password")
data.Set("client_id", c.clientId)
data.Set("client_secret", c.clientSecret)
data.Set("username", c.username)
data.Set("password", c.password)
client := &http.Client{}
req, err := http.NewRequest("POST", requestUrl, strings.NewReader(data.Encode()))
if err != nil {
log.Printf("error on http.NewRequest: %v", err)
return "", err
}
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
req.Header.Add("Accept", "*/*")
resp, err := client.Do(req)
if err != nil {
log.Printf("error on client.Do: %v", err)
return "", err
}
defer resp.Body.Close()
if resp.StatusCode > 299 {
var result TokenError
if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
return "", err
}
log.Printf("Error getting token: %v", result.ErrorDescription)
return "", errors.New("Error getting the token: " + result.ErrorDescription)
}
var result map[string]interface{}
if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
log.Fatalf("Failed to decode response body: %v", err)
}
token, ok := result["access_token"].(string)
if !ok {
return "", errors.New("access_token not found in response")
}
c.token = &token
return token, nil
}
func getEnv(key string) string {
if value, ok := os.LookupEnv(key); ok {
return value
}
return ""
}