Rails: Send email using Gmail API with attachment return only encoded file not

Question

I am trying to send an email using gmail API. My Ruby code as you can see below works well without an attachment:

client = google_client user_id
token = Token.find_by_user_id(user_id)
access_token = token.access_token
gmail = Google::Apis::GmailV1::GmailService.new
gmail.authorization = client
message              = Mail.new
message.date         = Time.now
message.subject      = 'Supertram p'
message.body         = "<p>Hi Alex, how's life?</p>"
message.content_type = 'text/html'
message.from         = self.email
message.to           = '[email protected]'

msg = message.encoded
message_object = Google::Apis::GmailV1::Message.new(raw:message.to_s)
gmail.send_user_message('me', message_object)

I was able to successfully send emails in html format. My question is how to attach a file to this message?

client = google_client user_id
token = Token.find_by_user_id(user_id)
access_token = token.access_token
gmail = Google::Apis::GmailV1::GmailService.new
gmail.authorization = client
message              = Mail.new
message.date         = Time.now
message.subject      = 'Supertramp'
message.body         = "<p>Hi Alex, how's life?</p>"
# message.content_type = 'text/html'
message.from         = self.email
message.to           = '[email protected]'
message.add_file("/Users/myname/Downloads/image.png")

msg = message.encoded
message_object = Google::Apis::GmailV1::Message.new(raw:message.to_s)
gmail.send_user_message('me', message_object)

but here is the message that I receive:

-- Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Alex, how's life?

-- Content-Type: image/png; filename=image.png Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename=image.png Content-ID: <[email protected]> iVBORw0KGgoAAAANSUhEUgAAAfAAAABMCAYAAACS0+VcAAAX9UlEQVR4Ae2d XWxj1bXH/6lKK+D1VE1oKEa6CPNwpQh4SFBapYOrIoGUuRnN6IRR25HuC1C/ AC8JDMiFGTlP8 [...] == ----

I only receive an encoded string, but not an attached file. My question is how to send an email by Gmail API with an attachment?

You want to send a multipart e-mail, so don’t specify the content type as 'text/html' ... (Go research what you need to use instead.) — C3roe
– C3roe, Commented Jan 29, 2018 at 9:09
i have tried using 'multipart/alternative' but my html part is missing — Jais Anasrulloh Ja'fari
– Jais Anasrulloh Ja'fari, Commented Jan 29, 2018 at 9:12
Have you tried reading this developers.google.com/gmail/api/guides/uploads? — Linda Lawton - DaImTo
– Linda Lawton - DaImTo, Commented Jan 29, 2018 at 9:15
from where are you getting that Mail class? I couldn't locate it in the google-api-ruby-client library. — Masroor
– Masroor, Commented Oct 13, 2020 at 19:07

Linda Lawton - DaImTo · Accepted Answer · 2018-01-29 09:35:34Z

3

I think you are missing somethings with regard to the attacment

message              = Mail.new
message.date         = Time.now
message.subject      = 'Test Email'
message.body         = "<p>Hi Test, how's life?</p>"
message.content_type = 'text/html'
message.from         = "Test User <[email protected]>"
message.to           = '[email protected]'

service = client.discovered_api('gmail', 'v1')

result = client.execute(
  api_method: service.users.messages.to_h['gmail.users.messages.send'],
  body_object: {
    raw: Base64.urlsafe_encode64(message.to_s)
  },
  parameters:  {
    userId: '[email protected]'
  },
    headers:   { 'Content-Type' => 'application/json' }
)

response = JSON.parse(result.body)

For multi-part email with the attachment:

message         = Mail.new
message.date    = Time.now
message.subject = 'Supertramp'
message.from    = "testone <[email protected]>"
message.to      = '[email protected]'

message.part content_type: 'multipart/alternative' do |part|
  part.html_part = Mail::Part.new(body: "<p>Hi TEst, how's life?</p>", content_type: 'text/html; charset=UTF-8')
  part.text_part = Mail::Part.new(body: "Hi test, how's life?")
end

open('http://google.com/image.jpg') do |file| 
  message.attachments['image.jpg'] = file.read 
end

edited Jan 29, 2018 at 9:35

answered Jan 29, 2018 at 9:19

Linda Lawton - DaImTo

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3 Comments

Masroor Over a year ago

for future visitors wondering about the Mail class; it comes from this gem github.com/mikel/mail

Linda Lawton - DaImTo Over a year ago

@Prime if this is a project you work on personally you need to post that as a disclamer.

Masroor Over a year ago

no, I don't. Just a developer using it to get stuff done.

Sophy Lee · Accepted Answer · 2022-05-18 20:54:18Z

The original post is creating an instance of Google::Apis::GmailV1::Message with message, which is not encoded, instead of msg, which is encoded. The following solution works for me:

# Include the mail gem in your Gemfile https://github.com/mikel/mail

# Authentication
client = google_client user_id
token = Token.find_by_user_id(user_id)
access_token = token.access_token
gmail = Google::Apis::GmailV1::GmailService.new
gmail.authorization = client

# Create mail object
message              = Mail.new
message.date         = Time.now
message.subject      = 'test subject'
message.from         = self.email
message.to           = '[email protected]'

# Create the 3 necessary parts of the message
message.part content_type: 'multipart/alternative' do |part|
  part.html_part = Mail::Part.new(body: "<p>Hi Alex, how's life?</p>", content_type: 'text/html; charset=UTF-8')
  part.text_part = Mail::Part.new(body: "Hi Alex, how's life?")
end

message.attachments['file.pdf'] = File.open("/path/to/file.extension").read

# Encode the message
msg = message.encoded

# Important! Create an instance of Message with the encoded message
message_object = Google::Apis::GmailV1::Message.new(raw: msg.to_s)

gmail.send_user_message('me', message_object)

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