Salesforce to Salesforce Integration Using REST API and OAuth

Lets Start with Salesforce to Salesforce Integration Using REST API and OAuth.

Here I wanted to Access the All contacts for an Account From Target Org(2nd Salesforce Org)

Step-1: 

In Source Org Create one Connected App:

Login into Salesforce Sandbox or Salesforce Developer Org

then goto Setup-> App->Connected App

Click New

Change the Oauth CallBack URL according to your instance. Here my instance is "CS30"

https://cs30.salesforce.com/services/oauth2/callback

Then Save it.

After Save you will get Consumer Key & Consumer Secret

After this now we have to Develop one Apex RestService in the Same Source Org.

Step 2: Click on Setup-> Develop->Apex Class

Click New and Save it.

The purpose of this method is to return all contacts related to AccountId

1. @RestResource(urlMapping='/v1/getContacts/*')
2.    global with sharing class getContact {
3.      @Httpget
4.       global static list<contact> fetchAccount(){
5.         RestRequest req = RestContext.request;
6.         RestResponse res = Restcontext.response;
7.         Id accId = req.requestURI.substring(req.requestURI.lastIndexOf('/')+1);
8.         list<contact> lstcontact =[Select id , name,Phone,Fax,Email from contact where Accountid=:accId ];
9.         
10.         return lstcontact ;
11.       }
12.    }

Step-3: Now we have to consume the above Apex Rest Service in Target Salesforce Org.

1. Login into Target Org
2. Create new Apex Class "SendAccountUsingRESTAPI " see below

Replace following 4 values in your Apex Class

• clientId 

• clientSecret 

• username 

• password 

Also Change the Endpoint(line no.18) in which org you are trying to login. means where you have create your Connected App

req.setEndpoint('https://test.salesforce.com/services/oauth2/token');

Also Change the Endpoint(line no.32) in which org you are trying to access all the Contacts. means where you have developed your Apex RestService

String endPoint = 'https://cs30.salesforce.com/services/apexrest/v1/getContacts/' +accId;

APEX CLASS
*********************************************************************
public class SendAccountUsingRESTAPI {
  private final String clientId = 'XXXX1qDQKpai6KLQyEHS3pvpCcteS2b5rWP2A6JpuqP._w2byvgpP8EC56LtyVNOg7.p7';
   private final String clientSecret = '17825308XXX';
   private final String username = 'abaranwal@kloudrac.com.full';
   private final String password = 'XXX';
  public class deserializeResponse
   {
      public String id;
      public String access_token;
   }
  public String ReturnAccessToken (SendAccountUsingRESTAPI acount)
   {
      String reqbody = 'grant_type=password&client_id='+clientId+'&client_secret='+clientSecret+'&username='+username+'&password='+password;
     Http h = new Http();
      HttpRequest req = new HttpRequest();
      req.setBody(reqbody);
      req.setMethod('POST');
      req.setEndpoint('https://test.salesforce.com/services/oauth2/token');
      HttpResponse res = h.send(req);
     deserializeResponse resp1 = (deserializeResponse)JSON.deserialize(res.getbody(),deserializeResponse.class);
     system.debug('@@@@access_token@@'+resp1 );
      return resp1.access_token;
   }
     
   public static list<Contact> callgetContact (String accId)
   {
           SendAccountUsingRESTAPI acount1 = new SendAccountUsingRESTAPI();
           String accessToken;
           accessToken = acount1.ReturnAccessToken (acount1);
           list<Contact> LstContact=new List<Contact>();
           if(accessToken != null){
           String endPoint = 'https://cs30.salesforce.com/services/apexrest/v1/getContacts/' +accId;
           //String jsonstr = '{"accId" : "' + accId+ '"}';
           Http h2 = new Http();
           HttpRequest req1 = new HttpRequest();
           req1.setHeader('Authorization','Bearer ' + accessToken);
           req1.setHeader('Content-Type','application/json');
           req1.setHeader('accept','application/json');
           //req1.setBody(jsonstr);
           req1.setMethod('GET');
           req1.setEndpoint(endPoint);
           HttpResponse res1 = h2.send(req1);
           String trimmedResponse = res1.getBody().unescapeCsv().remove('\\');
           system.debug('@@@RESPONSE@@'+trimmedResponse);
           JSONParser parser = JSON.createParser(res1.getBody());
           set<Contact> contList=new set<Contact>();
            
            while (parser.nextToken() != null) {
                //Id
                
                if((parser.getCurrentToken() == JSONToken.FIELD_NAME) ){
                    Contact cont;
                    if ((parser.getCurrentToken() == JSONToken.FIELD_NAME) && (parser.getText() == 'Id')) {
                    // Get the value.
                    parser.nextToken();
                    // Compute the grand total price for all invoices.
                    string sId= parser.getText();
                    cont=new Contact();
                    cont.Id=sId;
                    system.debug('Id@@@' + sId);
                    
                    parser.nextToken();
                    if ((parser.getCurrentToken() == JSONToken.FIELD_NAME) && 
                        (parser.getText() == 'Name')) {
                        // Get the value.
                        parser.nextToken();
                        // Compute the grand total price for all invoices.
                        string sName= parser.getText();
                        cont.LastName=sName;
                        system.debug('Name@@@' + sName );
                    }
                    
                    //Email
                    parser.nextToken();
                    if ((parser.getCurrentToken() == JSONToken.FIELD_NAME) && 
                        (parser.getText() == 'Email')) {
                        // Get the value.
                        parser.nextToken();
                        // Compute the grand total price for all invoices.
                        string sEmail= parser.getText();
                        cont.Email=sEmail;
                        system.debug('Email@@@' + sEmail);
                    }
                    
                
                }
                contList.add(cont); 
                }
                
                
                
                contList.remove(null);
                
            }
            LstContact.AddAll(contList);
            system.debug('ContList@@@@'+Json.serialize(LstContact));
            
            
           
        
        }
        return LstContact;
   }
   
}

*********************************************************************

Yes now we are ALL set, you can call this  "callgetContact " in your visualforce Controller Class or in your Apex Trigger wherever you wanted to Show the List of Contacts..from Source Org.

Access List of Contact Using Following Syntax

SendAccountUsingRESTAPI.callgetContact('001n0000007lQ90');

Need help, please call me +91-95823-88885 or email me amulhai@gmail.com