(Go) Send GMail using REST API

See more GMail REST API Examples

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

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

    var success bool

    // Use the Chilkat Email API to create or load an email.
    email := chilkat.NewEmail()

    // 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.SetFromName("My Name")
    email.SetFromAddress("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.SetSubject("This is a test GMail email created using Chilkat.")
    email.SetCharset("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.NewStringBuilder()
    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.NewStringBuilder()
    email.GetMimeSb(sbMime)
    sbMime.Encode("base64url","utf-8")

    // The body of the HTTP request will be JSON..
    json := chilkat.NewJsonObject()
    json.UpdateSb("raw",sbMime)

    // Send the email...
    http := chilkat.NewHttp()
    http.SetAuthToken("GMAIL-ACCESS-TOKEN")

    url := "https://www.googleapis.com/gmail/v1/users/me/messages/send"
    resp := http.PostJson3(url,"application/json",json)
    if http.LastMethodSuccess() != true {
        fmt.Println(http.LastErrorText())
        email.DisposeEmail()
        sbHtml.DisposeStringBuilder()
        sbMime.DisposeStringBuilder()
        json.DisposeJsonObject()
        http.DisposeHttp()
        return
    }

    // A status code of 200 indicates success.
    fmt.Println("Response status code: ", resp.StatusCode())
    fmt.Println("Response body:")
    fmt.Println(resp.BodyStr())
    resp.DisposeHttpResponse()

    // 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"
    //  ]
    // }

    email.DisposeEmail()
    sbHtml.DisposeStringBuilder()
    sbMime.DisposeStringBuilder()
    json.DisposeJsonObject()
    http.DisposeHttp()