# Webhook Controller

## Create a Controller Class

{% hint style="info" %}
In this example, the access tokens are managed with <mark style="color:blue;">JsonNode</mark> to make this sample as simple as possible.&#x20;

However, in your project for production system, you will need to manage the tokens using <mark style="color:red;">Entity</mark> and <mark style="color:red;">TokenRepository</mark> rather than <mark style="color:blue;">JsonNode</mark>.
{% endhint %}

{% code title="WebhookController.java" %}

```java
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
```

{% endcode %}

```java
@RestController
public class WebhookController {
	
 @Autowired
 private EformSignService eformSignService;
 
 public static JsonNode token;
 private static Map<String, Object> map = new HashMap<>();
 private static JsonNode res;
 private static String downPath = "C:\\Users\\Public\\Downloads\\";	
 private static String member_id = "john.kim@forcs.com";
 private static String fileType = "document,audit_trail";
 private static String apiUrl;
 private static String accessToken;
 private static String refreshToken;
 private static String expiredAt;
```

```java
@PostMapping(value = "/webhook")
public void postBody(
    @RequestHeader("eformsign_signature") String signature,
    @RequestBody String body) throws Exception {
    
    System.out.println("    Webhook Header: " + signature);
    System.out.println("              Body: " + body);
    
    boolean valid = EformSignService.verifySignature(signature, body);
    System.out.println("   verifySignature: " + valid);
    
    if (valid) {		
	JSONParser jsonParse = new JSONParser();
	JSONObject jsonObj = (JSONObject) jsonParse.parse(body);
	String event_type = (String) jsonObj.get("event_type");
	JSONObject doc = (JSONObject) jsonObj.get(event_type);
	String document_status = (String) doc.get("document_status");
 	
 	if(token == null) {
 	    res = eformSignService.getAccessToken(member_id).block();
 	    saveToken();
 	    System.out.println("    getAccessToken: " + token); 		
    	} else if ( System.currentTimeMillis() > token.get("expiredAt").asLong()) {
    	    System.out.println("     Token expired." );
    	    res = eformSignService.getRefreshToken(token).block();
    	    saveToken();
    	    System.out.println("   getRefreshToken: " + res);
    	}
	    	
	if(event_type.equals("ready_document_pdf") && document_status.equals("doc_complete")) {				
	    String documentId = (String) doc.get("document_id");
	    			    		   		
	    byte[] bytes = eformSignService.downloadDocument(token, documentId, fileType).block();
	    Path path = Paths.get( downPath + documentId + ".zip");
	    Files.write(path, bytes);
	    System.out.println("  downloadDocument: " + path.getFileName() + " (" + Files.size(path) + " bytes)");
		    		
	    res = eformSignService.deleteDocument(token, documentId).block();
	    System.out.println("    deleteDocument: " +  downPath+documentId+".zip" + res);
	}
     }
 }
```

```java
private static void saveToken() {	 
    try {
	apiUrl = res.get("api_key").get("company").get("api_url").asText();
    } catch (NullPointerException e) {}
    accessToken = res.get("oauth_token").get("access_token").asText();
    refreshToken = res.get("oauth_token").get("refresh_token").asText();
    int expiresIn = res.get("oauth_token").get("expires_in").asInt();
    expiredAt = (((new Date().getTime() + (expiresIn - 3580) * 1000L)) + "");

    if (apiUrl != null) map.put("apiUrl", apiUrl);
    map.put("accessToken", accessToken);
    map.put("refreshToken", refreshToken);
    map.put("expiredAt", expiredAt);

    ObjectMapper objectMapper = new ObjectMapper();
    token = objectMapper.valueToTree(map);	
}
```


---

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