Grails2.1 Dynamic mail configuration - grails

Question

I am trying to send an email from a grails app. I tried with recommended settings using gmail and it worked fine. I sent mail successfully. But I want to override the username and password dynamically. I don't know how can I do it. Can anybody help?
grails {
mail {
host = "smtp.gmail.com"
port = 465
username = "faruq#gmail.com" // Want to change dynamically like variable ${branch.mail}
password = "12345" // Want to change dynamically like variable ${branch.pass}
props = [
"mail.smtp.auth":"true",
"mail.smtp.socketFactory.port":"465",
"mail.smtp.socketFactory.class":"javax.net.ssl.SSLSocketFactory",
"mail.smtp.socketFactory.fallback":"false"
]
}
}
I use this process for overriding the username from the controller
grailsApplication.config.grails.mail.username = Branch.get(2).mail
by this process username successfully changes
here Branch is my domain class and mail is property
but an authentication problem comes up:
javax.mail.AuthenticationFailedException: 535-5.7.8 Username and Password not accepted
Now what can I do?

Answer 1

You can use an external configuration file - put placeholder values in the main Config.groovy
grails {
mail {
host = "smtp.gmail.com"
port = 465
username = "<changeme>"
password = "<changeme>"
props = [
"mail.smtp.auth":"true",
"mail.smtp.socketFactory.port":"465",
"mail.smtp.socketFactory.class":"javax.net.ssl.SSLSocketFactory",
"mail.smtp.socketFactory.fallback":"false"
]
}
}
and then override them with the correct values in the external config:
grails {
mail {
username = "faruq#gmail.com"
password = "12345"
}
}
To be able to change the credentials dynamically at run time it gets rather more complicated. Under the covers the mail plugin creates a Spring bean which is an instance of JavaMailSenderImpl to handle the actual sending of emails, and this bean is configured by default with static settings from the config. But at runtime this class appears to call its own getUsername() and getPassword() every time it needs to send a message. So you could replace this bean with your own custom subclass of JavaMailSenderImpl that overrides these methods to pull the details from the request context (code example, not tested, and imports/error handling omitted):
src/groovy/com/example/RequestCredentialsMailSender.groovy
class RequestCredentialsMailSender extends JavaMailSenderImpl {
public String getUsername() {
return RequestContextHolder.requestAttributes?.currentRequest?.mailUsername ?: super.getUsername()
}
public String getPassword() {
return RequestContextHolder.requestAttributes?.currentRequest?.mailPassword ?: super.getPassword()
}
}
You'd have to register this bean in your resources.groovy, and duplicate a fair bit of the configuration from the mail plugin itself, which is less than ideal:
grails-app/conf/spring/resources.groovy
beans = {
mailSender(com.example.RequestCredentialsMailSender) {
def mailConf = application.config.grails.mail
host = mailConf.host
port = mailConf.port
username = mailConf.username // the default, if not set in request
password = mailConf.password
protocol = mailConf.protocol
javaMailProperties = mailConf.props
}
}
Now when you need to send mail from a controller you can do
request.mailUsername = Branch.get(2).mail
request.mailPassword = Branch.get(2).mailPassword
sendMail { ... }

Answer 2

Just wanted to verify Ian's answer and expand it.
In the default Config.groovy file I have the added external config line:
grails.config.locations = [
"file:./${appName}-config.groovy",
"classpath:${appName}-config.groovy"
]
....
// and here is the mail config as above
grails{
mail{
....
In the config file at the root level I have my config file: TestApp-config.groovy (where TestApp is the name of my app) as above:
grails {
mail {
username = "faruq#gmail.com"
password = "12345"
}
}
Didn't need anything past this and it worked great.

Answer 3

We can also use replyTo field if our aim is only to get the reply back on specific Email Id. We can dynamically pass an email id to "replyTo" field and can expect an email back on the same.
Example :
asynchronousMailService.sendMail
{
to ["xyz#gmail.com","pqr#gmail.com"]
subject "Subject Text"
if(ccs) cc ["xyz1#gmail.com","pqr1#gmail.com"]
if(bccs) bcc ["xyz2#gmail.com","pqr2#gmail.com"]
if(replyTo) replyTo "xyz#gmail.com"
if(attachBytes) attachBytes attachBytes
}
NOTE: Adding "replyTo" will only allow us to get the emails back on the specified email-id and will not send the email from the configured email.
It was suitable in my use case. Hope it helps !