(Go) 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.

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

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

    rest := chilkat.NewRest()
    var success bool

    //   Provide a previously obtained OAuth2 access token.
    oauth2 := chilkat.NewOAuth2()
    oauth2.SetAccessToken("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.
    bAutoReconnect := true

    // ----------------------------------------------------------------------
    // IMPORTANT: Note that the domain is "upload.box.com", not "api.box.com"
    // ----------------------------------------------------------------------
    success = rest.Connect("upload.box.com",443,true,bAutoReconnect)
    if success != true {
        fmt.Println(rest.LastErrorText())
        rest.DisposeRest()
        oauth2.DisposeOAuth2()
        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","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"}}
    jsonAttr := chilkat.NewJsonObject()
    jsonAttr.UpdateString("name","hedgehogs.jpg")
    jsonAttr.UpdateString("parent.id","0")

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

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

    // IMPORTANT: This example requires Chilkat v9.5.0.70 or later, for a fix that was made in
    // multipart/streaming uploads. 
    fileStream := chilkat.NewStream()
    fileStream.SetSourceFile("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.SetPartSelector("0")

    // Send the multipart/form-data request, which uploads the file by streaming directly from the filesystem.
    responseBody := rest.FullRequestMultipart("POST","/api/2.0/files/content")
    if rest.LastMethodSuccess() != true {
        fmt.Println(rest.LastErrorText())
        rest.DisposeRest()
        oauth2.DisposeOAuth2()
        jsonAttr.DisposeJsonObject()
        fileStream.DisposeStream()
        return
    }

    // A 201 is received for a successful upload
    if rest.ResponseStatusCode() != 201 {
        fmt.Println("Box.com upload failed.")
        fmt.Println("Request header:")
        fmt.Println(rest.LastRequestHeader())
        fmt.Println("---")
        fmt.Println("Response status code = ", rest.ResponseStatusCode())
        fmt.Println("Response body:")
        fmt.Println(*responseBody)
        rest.DisposeRest()
        oauth2.DisposeOAuth2()
        jsonAttr.DisposeJsonObject()
        fileStream.DisposeStream()
        return
    }

    fmt.Println("File uploaded.")

    rest.DisposeRest()
    oauth2.DisposeOAuth2()
    jsonAttr.DisposeJsonObject()
    fileStream.DisposeStream()