(Ruby) Send GMail using REST API

See more GMail REST API Examples

Demonstrates how to send an email using the GMail REST API.

Chilkat Ruby Downloads

install from rubygems.org
gem install chilkat
or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# Use the Chilkat Email API to create or load an email.
email = Chilkat::CkEmail.new()

# The From name/address don't need to be specified. 
# GMail will automatically use your Gmail address if the following 2 lines are omitted.
email.put_FromName("My Name")
email.put_FromAddress("my_account_name@gmail.com")

email.AddTo("John Smith","somebody@somewhere.com")
# To add more recipients, make additional calls to AddTo or AddCC, one per recipient...

email.put_Subject("This is a test GMail email created using Chilkat.")
email.put_Charset("utf-8")
email.AddPlainTextAlternativeBody("This is a test")

# Create an HTML email body with an embedded image.
cid = email.addRelatedFile("qa_data/jpg/starfish.jpg")
sbHtml = Chilkat::CkStringBuilder.new()
sbHtml.Append("<html><body>This is a <b>test</b><br><img src=\"cid:STARFISH_CID\"/></body></html>")
numReplacements = sbHtml.Replace("STARFISH_CID",cid)

email.AddHtmlAlternativeBody(sbHtml.getAsString())

# OK.. we now have an HTML email with an embedded JPG image
# We'll need to get the full MIME of the email encoded to a base64url string.
sbMime = Chilkat::CkStringBuilder.new()
email.GetMimeSb(sbMime)
sbMime.Encode("base64url","utf-8")

# The body of the HTTP request will be JSON..
json = Chilkat::CkJsonObject.new()
json.UpdateSb("raw",sbMime)

# Send the email...
http = Chilkat::CkHttp.new()
http.put_AuthToken("GMAIL-ACCESS-TOKEN")

url = "https://www.googleapis.com/gmail/v1/users/me/messages/send"
# resp is a CkHttpResponse
resp = http.PostJson3(url,"application/json",json)
if (http.get_LastMethodSuccess() != true)
    print http.lastErrorText() + "\n";
    exit
end

# A status code of 200 indicates success.
print "Response status code: " + resp.get_StatusCode().to_s() + "\n";
print "Response body:" + "\n";
print resp.bodyStr() + "\n";

# The response body contains JSON.
# Use the online tool at Generate JSON Parsing Code
# to generate JSON parsing code.

# A sample successful JSON response:

# {
#  "id": "166f0d4ac39e50bf",
#  "threadId": "166f0d4ac39e50bf",
#  "labelIds": [
#   "SENT"
#  ]
# }