Send emails with attachments in salesforce via sendgrid - salesforce

Question

I am trying to generate a pdf and attach to an email and send it.
I am using salesforce and sendgrid.
I am able to send emails but the problem is when I try to attach the pdf, the email is with the attachment, but this is broken, the file is not empty, but the pdf says is broken (I think is a problem of conversion)
here is the code
Messaging.EmailFileAttachment efa = new Messaging.EmailFileAttachment();
PageReference pdf = Page.include_attachment;
pdf.getParameters().put('id', 'xxxxxxxxxxxxxxxxxx');
blob fileBody = pdf.getContentAsPDF();
efa.setBody(fileBody);
efa.setFileName('test.pdf');
efa.setContentType('application/pdf;charset=UTF-8;');
send('xxxxx#xxxx.com','Test','Body Test', fileBody);
I tryied using
pdf.getContentAsPDF();
and
pdf.getContent();
but the result is the same.
Send method
public static void send(String emailRecipient, String emailSubject, String emailBody, Blob att){
Boolean success=true;
//construct the body of the request
String requestBody='';
requestBody += 'to='+EncodingUtil.urlEncode(emailRecipient,'UTF-8');
requestBody += '&from='+EncodingUtil.urlEncode(user.Email,'UTF-8');
requestBody += '&fromname='+EncodingUtil.urlEncode(user.Name,'UTF-8');
requestBody += '&subject='+EncodingUtil.urlEncode(emailSubject,'UTF-8');
requestBody += '&text='+EncodingUtil.urlEncode(emailBody.trim(),'UTF-8');
requestBody += '&html='+EncodingUtil.urlEncode(emailBody.trim(),'UTF-8');
requestBody += '&api_user=xxxxx';
requestBody += '&api_key=xxxxx';
requestBody += '&files[attachment.pdf]=#'+ EncodingUtil.base64Encode(att);
//construct request
HttpRequest req = new HttpRequest();
req.setEndpoint('https://sendgrid.com/api/mail.send.json');
req.setMethod('POST');
req.setBody(requestBody);
try{
//send request
Http h = new Http();
HttpResponse res = h.send(req);
//check response
String status = res.getStatus();
if(status.toUpperCase()=='OK'){
success=true;
}
else{
success=false;
}
}
catch(Exception e){
success=false;
}
}
Thank you

Answer 1

There is now a library/devtoolkit to do this for you. At the time of this writing it is in beta, but it is working. Disclaimer: I work at SendGrid and have just recently developed the library.
sendgrid-apex
You can rewrite your code to:
...
Blob att = pdf.getContentAsPDF();
public static void send(String emailRecipient, String emailSubject, String emailBody, Blob att){
SendGrid sendgrid = new SendGrid('username', 'password');
SendGrid.email email = new SendGrid.Email();
email.addTo(emailRecipient);
email.setFrom(user.Email);
email.setFromName(user.Name);
email.setSubject(emailSubject);
email.setText(emailBody.trim());
email.setHtml(emailBody.trim());
email.addAttachmentStream("attachment.pdf", att);
String response = sendgrid.send(email);
}