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How to do REST API call based on Custom Settings data?

So, I have a Lightning Component, when changes occurs there, it will save on Custom Settings.

If Object__c = Opportunity and Value__c = Closed Won from CustomSettings, I have to find the Opportunity record that meets the condition. If the Opporutnity record has Notes and Attachments, it will be uploaded to AWS.

Should I do it on Controller class or another trigger or class?

Please help me if this is correct:

String formattedDateString = Datetime.now().format('EEE, dd MMM yyyy HH:mm:ss z');   
		String host = 's3.amazonaws.com/';
        String method = 'PUT';
        HttpRequest req = new HttpRequest();
		Http http = new Http();
        Set<Id> Ids = new Set<Id>();
        for (Opportunity opp : [SELECT Id, Name FROM Opportunity WHERE IsClosed = true AND IsWon = true]) {
		List<Attachment> att = [SELECT Id, Name, Body, ContentType FROM Attachment WHERE ParentId IN :Ids];
        List<AWScredentialsSettings__c> values = [SELECT Id, ClientKey__c, SecretKey__c, BucketName__c FROM AWScredentialsSettings__c LIMIT 1];
        if (!att.isEmpty() && !values.isEmpty()) {
			String bucketname = values[0].BucketName__c;
			String key = values[0].ClientKey__c;
			String secret = values[0].SecretKey__c;
        	String attachmentBody = EncodingUtil.base64Encode(att[0].Body);
            String filename = att[0].Name;
            req.setEndpoint('https://' + host + bucketname + '/' + filename); // The file should be uploaded to this path in AWS -- Opportunity/Salesforce Id/Secret Files/filename
            req.setHeader('Content-Length', String.valueOf(attachmentBody.length()));
            req.setHeader('Content-Encoding', 'UTF-8');
            req.setHeader('Content-type', att[0].ContentType);
            req.setHeader('Connection', 'keep-alive');
            req.setHeader('Date', formattedDateString);
            req.setHeader('ACL', 'public-read');
            String stringToSign = method+'\n\n\n'+ att[0].ContentType + '\n' + formattedDateString +'\n/'+ bucketname +'/' + filename;
            Blob mac = Crypto.generateMac('HMACSHA1', blob.valueof(stringToSign),blob.valueof(secret));
            String signed  = EncodingUtil.base64Encode(mac);
            String authHeader = 'AWS' + ' ' + secret + ':' + signed;
        HTTPResponse res = http.send(req);
        System.debug('*Resp:' + String.ValueOF(res.getBody()));
        System.debug('RESPONSE STRING: ' + res.toString());
        System.debug('RESPONSE STATUS: ' + res.getStatus());
        System.debug('STATUS_CODE: ' + res.getStatusCode());