(Swift) Box.com Streaming Upload File

Demonstrates how to upload a file to box.com, streaming the file directly from the filesystem.

Note: This example requires a fix that is included in Chilkat v9.5.0.70 and above.

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

    let rest = CkoRest()
    var success: Bool

    //    Provide a previously obtained OAuth2 access token.
    let oauth2 = CkoOAuth2()
    oauth2.AccessToken = "BOX_ACCESS_TOKEN"
    rest.SetAuthOAuth2(oauth2)

    //  First, make the initial connection.
    //  A single REST object, once connected, can be used for many Box REST API calls.
    //  The auto-reconnect indicates that if the already-established HTTPS connection is closed,
    //  then it will be automatically re-established as needed.
    var bAutoReconnect: Bool = true

    //  ----------------------------------------------------------------------
    //  IMPORTANT: Note that the domain is "upload.box.com", not "api.box.com"
    //  ----------------------------------------------------------------------
    success = rest.Connect("upload.box.com", port: 443, tls: true, autoReconnect: bAutoReconnect)
    if success != true {
        print("\(rest.LastErrorText)")
        return
    }

    //  The request body uses the "multipart/form-data" format to transmit two "parts".
    //  The first part is called "attributes" and contains a JSON object with information about the file, including the name of the file
    //  and the ID of the parent folder. The second part contains the contents of the file.
    //  (Note that the name of the second "part" is ignored.)

    rest.AddHeader("Content-Type", value: "multipart/form-data")

    //  Provide the content for each part of the request...

    //  First the JSON attributes.  Use "0" for the root folder.
    //    {"name":"hedgehogs.jpg", "parent":{"id":"0"}}
    let jsonAttr = CkoJsonObject()
    jsonAttr.UpdateString("name", value: "hedgehogs.jpg")
    jsonAttr.UpdateString("parent.id", value: "0")

    rest.PartSelector = "1"
    rest.AddHeader("Content-Disposition", value: "form-data; name=\"attributes\"; ")
    rest.SetMultipartBodyString(jsonAttr.Emit())

    //  The upload will stream directly from a file.
    rest.PartSelector = "2"
    rest.AddHeader("Content-Disposition", value: "form-data; name=\"file\"; filename=\"hedgehogs.jpg\"")
    //  "application/octet-stream" can be safely used for any type file..
    rest.AddHeader("Content-Type", value: "application/octet-stream")

    //  IMPORTANT: This example requires Chilkat v9.5.0.70 or later, for a fix that was made in
    //  multipart/streaming uploads.
    let fileStream = CkoStream()
    fileStream.SourceFile = "qa_data/jpg/hedgehogs.jpg"
    rest.SetMultipartBodyStream(fileStream)

    //  Restore the PartSelector to "0" (for safety, in case something else sends another request on this object)
    rest.PartSelector = "0"

    //  Send the multipart/form-data request, which uploads the file by streaming directly from the filesystem.
    var responseBody: String? = rest.FullRequestMultipart("POST", uriPath: "/api/2.0/files/content")
    if rest.LastMethodSuccess != true {
        print("\(rest.LastErrorText)")
        return
    }

    //  A 201 is received for a successful upload
    if rest.ResponseStatusCode.integerValue != 201 {
        print("Box.com upload failed.")
        print("Request header:")
        print("\(rest.LastRequestHeader)")
        print("---")
        print("Response status code = \(rest.ResponseStatusCode.integerValue)")
        print("Response body:")
        print("\(responseBody!)")
        return
    }

    print("File uploaded.")

}