Swift
Send GMail using REST API

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

Swift

func chilkatTest() {
    var success: Bool = false

    // 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.
    let email = CkoEmail()!

    // 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.fromName = "My Name"
    email.fromAddress = "my_account_name@gmail.com"

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

    email.subject = "This is a test GMail email created using Chilkat."
    email.charset = "utf-8"
    email.addPlainTextAlternativeBody(body: "This is a test")

    // Create an HTML email body with an embedded image.
    var cid: String? = email.addRelatedFile(path: "qa_data/jpg/starfish.jpg")
    let sbHtml = CkoStringBuilder()!
    sbHtml.append(value: "<html><body>This is a <b>test</b><br><img src=\"cid:STARFISH_CID\"/></body></html>")
    var numReplacements: Int = sbHtml.replace(value: "STARFISH_CID", replacement: cid).intValue

    email.addHtmlAlternativeBody(body: 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.
    let sbMime = CkoStringBuilder()!
    email.getMimeSb(sb: sbMime)
    sbMime.encode(encoding: "base64url", charset: "utf-8")

    // The body of the HTTP request will be JSON..
    let json = CkoJsonObject()!
    json.updateSb(jsonPath: "raw", sb: sbMime)

    // Send the email...
    let http = CkoHttp()!
    http.authToken = "GMAIL-ACCESS-TOKEN"

    var url: String? = "https://www.googleapis.com/gmail/v1/users/me/messages/send"
    let resp = CkoHttpResponse()!
    success = http.httpJson(verb: "POST", url: url, json: json, contentType: "application/json", response: resp)
    if success == false {
        print("\(http.lastErrorText!)")
        return
    }

    // A status code of 200 indicates success.
    print("Response status code: \(resp.statusCode.intValue)")
    print("Response body:")
    print("\(resp.bodyStr!)")

    // 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"
    //  ]
    // }

}