Add Sendgrid mailer for real email integration

src/main/java/com/mercadolivre/apimlv2/shared/mail/FakeMailer.java

@@ -1,12 +1,12 @@
 package com.mercadolivre.apimlv2.shared.mail;
 
-import org.springframework.context.annotation.Primary;
+import org.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Component;
 
 import java.text.MessageFormat;
 
 @Component
-@Primary
+@Profile("dev")
 public class FakeMailer implements Mailer {
     @Override
     public void sendText(String to, String subject, String body) {

src/main/java/com/mercadolivre/apimlv2/shared/mail/SendgridMailer.java

@@ -0,0 +1,47 @@
+package com.mercadolivre.apimlv2.shared.mail;
+
+import com.sendgrid.Method;
+import com.sendgrid.Request;
+import com.sendgrid.SendGrid;
+import com.sendgrid.helpers.mail.Mail;
+import com.sendgrid.helpers.mail.objects.Content;
+import com.sendgrid.helpers.mail.objects.Email;
+import com.sendgrid.helpers.mail.objects.Personalization;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Component;
+
+import java.io.IOException;
+
+@Component
+@Profile("!dev")
+public class SendgridMailer implements Mailer {
+
+    private final SendGrid sendGrid;
+
+    public SendgridMailer(@Value("${sendgrid.api.key}") String apiKey) {
+        this.sendGrid = new SendGrid(apiKey);
+    }
+
+    @Override
+    public void sendText(String to, String subject, String body) {
+        Email from = new Email("no-reply@mercadolivre.com");
+        Email toEmail = new Email(to);
+        Content content = new Content("text/plain", body);
+        Mail mail = new Mail(from, subject, toEmail, content);
+
+        Personalization personalization = new Personalization();
+        personalization.addTo(toEmail);
+        mail.addPersonalization(personalization);
+
+        Request request = new Request();
+        try {
+            request.setMethod(Method.POST);
+            request.setEndpoint("mail/send");
+            request.setBody(mail.build());
+            sendGrid.api(request);
+        } catch (IOException ex) {
+            throw new RuntimeException("Failed to send email", ex);
+        }
+    }
+}

src/main/resources/application.yml

@@ -12,4 +12,8 @@ spring:
       accept-case-insensitive-enums: true
 jwt:
   secret: jdk02kdadnjndiawd
-  expTime: 86400
+  expTime: 86400
+
+sendgrid:
+  api:
+    key: YOUR_SENDGRID_API_KEY