Inserting file in Salesforce file/attachment object Using custom REST API Uses property of "ContentVersion", "ContentDocumentLink" and "getBodyAsBlob()" in apex class post method in Salesforce | File upload to Salesforce object using custom REST API

Hey guys, today in this post we are going to learn about How to call an external REST API to uploading files to SFDC file/attachment object using REST call in Salesforce Apex Post Methods.

This example we are uploading files to Salesforce object using custom REST API and property of ContentVersion, ContentDocumentLink and getBodyAsBlob() in Salesforce Apex Class Post Method.

To access the external REST API, First we need to Adding the Remote Site Settings

Setup ➡ Remote Site Settings ➡ Remote Site Name ➡ Enter the URL for the remote site

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Don’t forget to check out:- How to call an external REST API to get data from API and passing the variables from REST API to apex method in Salesforce using Apex REST Post Methods

Files we used to upload file in Salesforce

apiIntegrationCmp.cmp	Lightning Component	It is used to uplod the file into salesforce object from custom REST API using apex post method in salesforce.
apiIntegrationCmpController.js	JavaScript Controller File	It is hold Javascript apiIntegrateAction function to call the apex class method and insert file to salesforce object.
downloadExcelApiCtrl.apxc	Apex Class Controller	It is used to get the file from custom API and uploading files to SFDC using Apex post method.
Salesforce Object	Object Name:- Opportunity Related Object’s Name:- File/Attachment

You can download file directly from github by Click Here.

Other related post that would you like to learn in Salesforce

Find the below steps:-

Create Lightning Component

Step 1:- Create Lightning Component : apiIntegrationCmp.cmp

From Developer Console ➡ File ➡ New ➡ Lightning Component

apiIntegrationCmp.cmp [Lightning Component File]

   <aura:component controller="downloadExcelApiCtrl" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >

	<aura:attribute name="oppObj" type="Opportunity" default="{'sobjectType' : 'Opportunity'}"/>

    <aura:attribute name="oppMode" type="Map"/>

    <aura:attribute name="oppName" type="String" default=""/>

    <aura:attribute name="response" type="Map"/>

    <aura:attribute name="spinnerImg" type="boolean" default="false"/>

    <div class="slds slds-p-around--medium">

        <lightning:button variant="brand" label="Insert File in Salesforce" title="Insert File in Salesforce" type="Button" onclick="{!c.apiIntegrateAction}"></lightning:button>

```
    </div>
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    <br/><br/>
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<div style="border:1px #ddd solid; padding:10px; background:#eee; margin:40px 0;">

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```

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            <br/><br/>
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               <div style="clear:both;"></div>

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   </lightning-card> 
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</template>
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</aura:component>
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Create Component JavaScript Controller

Step 2:- Create Lightning Component : apiIntegrationCmpController.js

From Developer Console ➡ File ➡ New ➡ Lightning Component ➡ JavaScript Controller

apiIntegrationCmpController.js [JavaScript Controller]

```
   ({
```

	apiIntegrateAction : function(component, event, helper) {

        var recordId = component.get("v.recordId");

        var oppName = component.get('v.oppName');

		var action = component.get("c.fileInsert");

```
        action.setParams({
```

            "url": 'https://test.com/fileInsert',

```
            "recId":recordId,
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            "oppNameStr": oppName,

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            "fileName": oppName,
```
```
          });
```

        action.setCallback(this, function(response){

            var state = response.getState(response);

```
 
```
```
            if(state == "SUCCESS"){
```

                    component.set("v.spinnerImg",false);

                    var results = response.getReturnValue();

                    console.log('results ' + results);

                    var getResponse = JSON.stringify(results);

                    //alert(JSON.stringify(results));

                      component.set("v.response", getResponse);

                     //alert(results.message);

                       var toastEvent = $A.get("e.force:showToast");

                        toastEvent.setParams({

                            'title':'Success',

                            'type':'Success',

                            'message':'File Inserted Successfully in Salesforce'

```
                        });
```

                        toastEvent.fire();

```
                }
```
```
                else{
```

                    var toastEvent = $A.get("e.force:showToast");

                        toastEvent.setParams({

                            'title':'Error',

                            'type':'Error',

                            'message':'Response Not Found'

```
                        });
```

                        toastEvent.fire();

```
                }
```
```
        });
```
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        $A.enqueueAction(action);
```
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	},
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```
 
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})
```

Create Apex Class Controller

Step 3:- Create Apex Class : downloadExcelApiCtrl.apxc

From Developer Console ➡ File ➡ New ➡ Apex Class

downloadExcelApiCtrl.apxc [Apex Class Controller]

   @RestResource(urlMapping='/insertFileToSalesforce/')

```
global class downloadExcelApiCtrl {
```
```
 
```
```
    @AuraEnabled
```

    global static void fileInsert(String recId, String oppNameStr, String url, String fileName) {

```
        Http h = NEW Http();   
```

        HttpRequest req = NEW HttpRequest();

```
        req.setEndpoint(url);
```
```
        req.setTimeout(120000);
```
```
        req.setMethod('POST');
```

        req.setHeader('Content-Type', 'application/json;charset=UTF-8');

        req.setBody('{"oppName": "'+oppNameStr+'"}');

        // Send the request, AND RETURN a response

```
        HttpResponse res = h.send(req);
```

        System.debug('response:--> ' + res.getBody());

```
 
```

        BLOB blobData = res.getBodyAsBlob();

        ContentVersion cntVerson = NEW ContentVersion();

        cntVerson.VersionData = blobData;

        cntVerson.Title = fileName + '.xlsx';

        cntVerson.PathOnClient = fileName + '.xlsx';

```
        INSERT cntVerson;
```

        system.debug('cntVerson### ' + cntVerson);

```
 
```

        ContentDocumentLink contDocmnt = NEW ContentDocumentLink();

        contDocmnt.ContentDocumentId = [SELECT Id, ContentDocumentId FROM ContentVersion WHERE Id =: cntVerson.Id].ContentDocumentId;

        contDocmnt.LinkedEntityId = recId;

```
        contDocmnt.ShareType = 'V';
```
```
        INSERT contDocmnt;        
```
```
    }    
```
```
 
```
```
}
```

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FAQ (Frequently Asked Questions)

What is a custom REST API?

Custom REST APIs to build up a library of services that can be used by your mobile apps and intelligent bots.

What is REST API services?

A REST API is an application programming interface that conforms to the constraints of REST architectural style and allows for interaction with RESTful web services.

What is REST API vs API?

REST basically is a style of web architecture that governs the behavior of clients and servers. While API is a more general set of protocols and is deployed over the software to help it interact with some other software.

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Inserting file in Salesforce file/attachment object Using custom REST API Uses property of “ContentVersion”, “ContentDocumentLink” and “getBodyAsBlob()” in apex class post method in Salesforce | File upload to Salesforce object using custom REST API