ICS File In Salesforce

Have you ever tried sending a meeting Invitation from Salesforce using Apex Code. Below is the code to Achieve the Same.

It creates and sends an email. For any Calendar meeting the universal format for file Accepted is .ICS
and it is nothing but a string containing all the information.

I have used this file as the mail attachment and have set the Content type of email as "text/calendar"

Code Below
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String vCal = 'BEGIN:VCALENDAR' + '\n' + 'PRODID:-//Force.com Labs//iCalendar Export//EN' + '\n' +
'VERSION:2.0' + '\n' + 'CALSCALE:GREGORIAN' + '\n' + 'METHOD:REQUEST'+ '\n'+ 'BEGIN:VEVENT'+ '\n' +
'DTSTART:20131008T103000Z' + '\n' + 'DTEND:20131008T113000Z' + '\n' + 'DTSTAMP:20091008T103839Z' + '\n' +
'ORGANIZER;CN=varun.vatsa@gmail.com:mailto:varun.vatsa@gmail.com' + '\n' + 'UID:varun.vatsa@gmail.com'+ '\n' +
'CREATED:20091008T103839Z' + '\n' + 'DESCRIPTION:something' + '\n' + 'LAST-MODIFIED:20091008T103839Z' + '\n' +
'SEQUENCE:0' + '\n' + 'STATUS:CONFIRMED' + '\n' + 'SUMMARY:Test ICS Mail Format' + + '\n' + 'TRANSP:OPAQUE' + '\n' +
'END:VEVENT'+ '\n' + 'END:VCALENDAR';
List<String> toAddresses = new List<String>();
        toAddresses.add('varun.vatsa@gmail.com');
        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
        email.setSubject('Test');
        email.setToAddresses(toAddresses);
        email.setHtmlBody('Test');
        email.setPlainTextBody('Test');
        Messaging.EmailFileAttachment efa = new Messaging.EmailFileAttachment();
        efa.setFileName('rfc2445.ics');
     
        efa.setBody(blob.valueOf(vCal));
        //attachments.add(efa);
        efa.setContentType('text/calendar');
        email.setFileAttachments(new Messaging.EmailFileAttachment[] {efa});
         Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});

Amazon S3 signature for Apex

Hi,

Please find below the method to return a valid signature generated in Salesforce's Apex language.
This signature is required to make any Rest/Soap call on Amazon's S3 servers.

Arguments to this method are : Current DateTime and the name of Operation that you want to perform for example "Get Object".

 public static String getSignature(DateTime now,String op){
       
        //format should be like 2006-01-01T12:00:00.000Z
        String formattednow = now.formatGmt('yyyy-MM-dd')+'T'+now.formatGmt('HH:mm:ss')+'.'+now.formatGMT('SSS')+'Z';
        System.Debug('Formatted date : '+formattednow);
       
        String canonical = 'AmazonS3'+op+formattednow; //"AmazonS3" + OPERATION + Timestamp
       
        System.debug('CANONICAL = '+canonical);
       
        Blob bsig = Crypto.generateMac('HmacSHA1', Blob.valueOf(canonical), Blob.valueOf(secretAccessKey));
       
       
        String signature = EncodingUtil.base64Encode(bsig);
        return signature;
    }