(Swift 2) Outlook --Download Attachments for a Specific Message

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Demonstrates how to download the attachments for a particular email message.

Note: This example requires Chilkat v9.5.0.67 or greater.

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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).

    http.AuthToken = "MICROSOFT_GRAPH_ACCESS_TOKEN"

    let sbResponse = CkoStringBuilder()

    // Sends:  GET /users/{user_id | userPrincipalName}/messages/{message_id}/attachments
    // Note: It is also possible to use the literal string "me" for the current logged-on user.
    // For example: GET /me/messages/{message_id}/attachments

    http.ClearUrlVars()
    http.SetUrlVar("userPrincipalName", value: "chilkatsoft@outlook.com")

    // Assume we already have a message ID from previously listing the messages in a folder
    var messageId: String? = "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAA=="
    http.SetUrlVar("message_id", value: messageId)

    // Send the request to download the attachments.
    var success: Bool = http.QuickGetSb("https://graph.microsoft.com/v1.0/users/{$userPrincipalName}/messages/{$message_id}/attachments", sbContent: sbResponse)
    if (success != true) && (http.LastStatus.intValue == 0) {
        print("\(http.LastErrorText)")
        return
    }

    // The attachment data is contained within the JSON response.
    let json = CkoJsonObject()
    json.LoadSb(sbResponse)
    json.EmitCompact = false

    print("Status code = \(http.LastStatus.intValue)")
    if http.LastStatus.intValue != 200 {
        print("\(json.Emit())")
        print("Failed.")
    }

    // This is a sample JSON response.  The code for parsing and extracting/saving the attachments
    // is shown below.

    // 	{
    // 	  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('chilkatsoft%40outlook.com')/messages('AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAA%3D%3D')/attachments",
    // 	  "value": [
    // 	    {
    // 	      "@odata.type": "#microsoft.graph.fileAttachment",
    // 	      "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAft6wtbaSJU6sgQLi98DI0Q==",
    // 	      "lastModifiedDateTime": "2017-05-10T00:30:51Z",
    // 	      "name": "fishing.pdf",
    // 	      "contentType": "application/pdf",
    // 	      "size": 295680,
    // 	      "isInline": false,
    // 	      "contentId": "F861B218BE380F44B16933097FDDACFC@namprd20.prod.outlook.com",
    // 	      "contentLocation": null,
    // 	      "contentBytes": "JVBERi0xLjMKJcfsj6 ... yZWYKMjk0MzY5CiUlRU9GCg=="
    // 	    },
    // 	    {
    // 	      "@odata.type": "#microsoft.graph.fileAttachment",
    // 	      "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAADn68XtMop0TpsYJGpfKXY9AAAAwSju2wAAAAESABAAXS7qXQ-iRUCYXnhJpN8Ihg==",
    // 	      "lastModifiedDateTime": "2017-05-10T00:30:51Z",
    // 	      "name": "testCert.cer",
    // 	      "contentType": "application/octet-stream",
    // 	      "size": 1674,
    // 	      "isInline": false,
    // 	      "contentId": "5E51FA33EF0F8941ACC8260395CB1A33@namprd20.prod.outlook.com",
    // 	      "contentLocation": null,
    // 	      "contentBytes": "MIIFRjCCBC6gAwIBA ... 7pt3C5w=="
    // 	    }
    // 	  ]
    // 	}

    let sbSavePath = CkoStringBuilder()
    let attachData = CkoBinData()
    let lastMod = CkoDateTime()
    let fac = CkoFileAccess()

    var i: Int = 0
    var numMessages: Int = json.SizeOfArray("value").intValue
    while i < numMessages {
        json.I = i

        print("name: \(json.StringOf("value[i].name"))")
        print("contentType: \(json.StringOf("value[i].contentType"))")
        var sizeInBytes: Int = json.IntOf("value[i].size").intValue
        print("size: \(sizeInBytes)")

        // Extract the data and save to a file.
        sbSavePath.SetString("qa_output/")
        sbSavePath.Append(json.StringOf("value[i].name"))

        attachData.Clear()
        attachData.AppendEncoded(json.StringOf("value[i].contentBytes"), encoding: "base64")
        attachData.WriteFile(sbSavePath.GetAsString())

        // Get the last-modified date/time and set the output file's last-mod date/time..
        lastMod.SetFromTimestamp(json.StringOf("value[i].lastModifiedDateTime"))
        fac.SetLastModified(sbSavePath.GetAsString(), lastModified: lastMod)

        print("----")

        i = i + 1
    }

    // The output of the above loop is:
    // 
    // 	name: fishing.pdf
    // 	contentType: application/pdf
    // 	size: 295680
    // 	----
    // 	name: testCert.cer
    // 	contentType: application/octet-stream
    // 	size: 1674
    // 	----
    // 

}