How can I download an Email using the Gmail api with Go

Question

Trying to use the Go library of the Gmail API (v1) to get the raw content of a email and parse it as a byte slice {[]byte} so I can save it as an email. Any tips?

Answer 1

Looking at the package (https://pkg.go.dev/google.golang.org/api/gmail/v1#Message) it states:

// Raw: The entire email message in an RFC 2822 formatted and base64url
// encoded string. Returned in `messages.get` and `drafts.get` responses
// when the `format=RAW` parameter is supplied.

Get the email using the rfc822msgId. This can be grabbed from the header.

gmailMessageResposne, _ := gmail.Service.Users.Messages.Get("[email protected]", "rfc822msgid").Format("RAW").Do() 

Once you have the *gmail.Message object you can decode the raw string via

decodedData, _ := base64.URLEncoding.DecodeString(gmailMessageResposne.Raw)

Then

base64.URLEncoding(decodedData, decodedData)

Finally

ioutile.WriteFile("message.eml", decodedData, os.ModePerm)

This worked for me!

Answer 2

I have found the cause for why Spring Boot was not autowiring my properties with @Value or @ConfigurationProperties It turns out that the project I am trying to migrate implemented a PropertyPlaceholderConfigurer bean which was failing to initialize the properties properly. I have done away with that bean and the application is now loading and autowiring all properties from application.properties (from all modules)