(Swift 3,4,5...) Outlook Send Email using MIME Format

See more Outlook Examples

This example sends an email using MIME format via the Microsoft Graph Outlook REST API.

For more information, see https://learn.microsoft.com/en-us/graph/api/user-sendmail?view=graph-rest-1.0&tabs=http#example-4-send-a-new-message-using-mime-format

Chilkat Downloads for the Swift Programming Language

MAC OS X (Cocoa) Objective-C/Swift Libs

iOS Objective-C/Swift Libs

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

    let http = CkoHttp()!

    // Use your previously obtained access token here:
    // See the following examples for getting an access token:
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
    //    Refresh Access Token (Azure AD v2.0 Endpoint).
    //    Refresh Access Token (Azure AD Endpoint).

    let jsonToken = CkoJsonObject()!
    var success: Bool = jsonToken.loadFile("qa_data/tokens/microsoftGraph.json")
    if success == false {
        print("\(jsonToken.lastErrorText!)")
        return
    }

    http.authToken = jsonToken.string(of: "access_token")

    // To send email, we'll POST to the following endpoint:
    // 
    // POST /users/{id | userPrincipalName}/sendMail
    // 
    // (The special keyword "me" may be used in place of a principal name.)
    // 

    // The body of the POST request will contain the MIME source of the email in base64 format.

    // Create a new email object
    let email = CkoEmail()!
    email.subject = "Test Outlook API to Send HTML Email with Attachments"
    email.from = "Mary <mary@somewhere.com>"
    email.add(to: "Joe", emailAddress: "joe@example.com")

    // Add a plain-text alternative body, which will likely never be seen.
    // (It is shown if the receiving email client is incapable of displaying HTML email.)
    email.addPlainTextAlternativeBody("This is a plain-text alternative body...")

    // Our HTML will include an image, so add the related image here.
    var contentIdStarfish: String? = email.addRelatedFile("qa_data/jpg/starfish.jpg")
    if email.lastMethodSuccess != true {
        print("\(email.lastErrorText!)")
        return
    }

    // The src attribute for the image tag is set to the contentIdStarfish:
    let sbHtml = CkoStringBuilder()!
    sbHtml.append("<html><body><p>This is an HTML email with an embedded image.</p>")
    sbHtml.append("<p><img src=\"cid:CONTENT_ID_STARFISH\" /></p></body></html>")
    var numReplacements: Int = sbHtml.replace("CONTENT_ID_STARFISH", replacement: contentIdStarfish).intValue

    email.addHtmlAlternativeBody(sbHtml.getAsString())

    // Finally, add some attachments to the email.
    // Add a file attachment.
    success = email.addFileAttachment2("qa_data/pdf/fishing.pdf", contentType: "application/pdf")
    if success != true {
        print("\(email.lastErrorText!)")
        return
    }

    // Add an attachment where the content is contained in a string.
    var content: String? = "This is the content of the 2nd attached file."
    email.addStringAttachment("someText.txt", str: content)

    // Get the email as multi-line base64..
    let bdMime = CkoBinData()!
    email.getMimeBd(bdMime)

    // Now get it as multi-line base64
    let sbBase64 = CkoStringBuilder()!
    bdMime.getEncodedSb("base64_mime", sb: sbBase64)

    // Send the HTTP POST (i.e. send the email)
    var resp: CkoHttpResponse? = http.pTextSb("POST", url: "https://graph.microsoft.com/v1.0/me/sendMail", textData: sbBase64, charset: "utf-8", contentType: "text/plain", md5: false, gzip: false)
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
        return
    }

    // The send succeeded if the response status code = 202.
    // In the success case, there is no response body.  (We just get the response code to know that it succeeded.)
    if resp!.statusCode.intValue != 202 {
        let json = CkoJsonObject()!
        json.load(resp!.bodyStr)
        json.emitCompact = false
        print("\(json.emit()!)")
        print("Failed, response status code = \(resp!.statusCode.intValue)")
    }
    else {
        print("Outlook Mail Sent.")
    }

    resp = nil

}