CANVAS_TO_SALESFORCE_INTEGRATION

gistfile1.java

// This class makes an HTTP GET request to canvas API and inserts the data received from canvas API in salesforce

// create a class which can be called on a schedule
global class FinalTCS implements Schedulable, Database.AllowsCallouts{
    public void execute(SchedulableContext SC) {
        callWebService();
    }
     @future(callout=true) 
     public static void callWebService() {   
     
      // make a get request to canvas API
      
      //CanvasCallout.getUsers();`
      System.debug('Started the callout execution');
      Http http = new Http();
        HttpRequest request = new HttpRequest();
        request.setEndpoint('https://<canvas_link>/api/v1/courses');
        request.setMethod('GET');
        request.setHeader('Authorization', <authorization_token>);
        HttpResponse response = http.send(request);
         System.debug('Response code '+ response.getStatusCode());
        if (response.getStatusCode() == 200) {
        
            // insert the data in salesforce
            
            List<Object> results = (List<Object>) JSON.deserializeUntyped(response.getBody());
            System.debug('Received the following response:');
           Map<String, Object> usersMap = new Map<String, Object>();
            for (Object result: results) {
                System.debug(result);
                Map<String, Object> user = (Map<String, Object>) result;
                usersMap.put(String.valueOf(user.get('name')), result);
            }
        Set<String> names =  usersMap.keySet();
        List<SObject> contacts = [Select ID, Name,Test__c ,COVID_19__c from Cycle__c Where Name IN :names];
            System.debug('Found cycles ' + contacts.size());
        Map<String, SObject> contactMap = new Map<String, SObject>();
        for(SObject contact : contacts){
            contactMap.put(String.valueOf(contact.get('Name')), contact);
        }
        System.debug('Existing cycles list '+ JSON.serialize(contactMap));
        List<SObject> contactsToUpdate = new List<SObject>();
            System.debug('Users list size fetched is ' + usersMap.size());
        for(String name : usersMap.keySet()){
            if(contactMap.containsKey(name)){
                System.debug('Name '+ name);
                System.debug('ContactMap again ' + JSON.serialize(contactMap));
                SObject existingContact = contactMap.get(name);
                System.debug('existingContact before '+ JSON.serialize(existingContact));
                existingContact.put('Test__c', String.valueOf(usersMap.get('name')));
                System.debug('existingContact after '+ JSON.serialize(existingContact));
                contactsToUpdate.add(existingContact);
            } else {
               //No need to create new contacts!
            }
        }
            System.debug('Final list to update ' + JSON.serialize(contactsToUpdate));
            Database.update(contactsToUpdate);
        }
   }
}