(Ruby) Download a Specific GMail Message into a Chilkat Email Object

Demonstrates how to download a GMail message into a Chilkat Email object.

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.

http = Chilkat::CkHttp.new()
http.put_AuthToken("GMAIL-ACCESS-TOKEN")

# The id of the GMail message to download.
id = "166e50fed0b9b0cb"
userId = "me"

http.SetUrlVar("userId","me")
http.SetUrlVar("id",id)

# Fetch the email.
url = "https://www.googleapis.com/gmail/v1/users/{$userId}/messages/{$id}?format=raw"
sbJson = Chilkat::CkStringBuilder.new()
success = http.DownloadSb(url,"utf-8",sbJson)
if (success != true)
    print http.lastErrorText() + "\n";
    exit
end

json = Chilkat::CkJsonObject.new()
json.LoadSb(sbJson)
json.put_EmitCompact(false)

if (http.get_LastStatus() != 200)
    print json.emit() + "\n";
    print "Failed." + "\n";
    exit
end

# The returned JSON contains something like this:

# {
#   "id": "166e50fed0b9b0cb",
#   "threadId": "166e50fed0b9b0cb",
#   "labelIds": [
#     "CATEGORY_SOCIAL",
#     "INBOX"
#   ],
#   "snippet": "...",
#   "historyId": "582477",
#   "internalDate": "1541441317000",
#   "sizeEstimate": 28603,
#   "raw": "BASE64URL_CONTENT"
# }

# The RFC822 MIME of the email is contained in the "raw" as a base64URL encoded string.
# Let's decode and load into a Chilkat email object..
sbRaw = Chilkat::CkStringBuilder.new()
json.StringOfSb("raw",sbRaw)
sbRaw.Decode("base64url","utf-8")

email = Chilkat::CkEmail.new()
email.SetFromMimeSb(sbRaw)

# Now we can use the email API to do whatever we desire..
print "From: " + email.fromAddress() + "\n";
print "Subject: " + email.subject() + "\n";
# ...