(Go) SharePoint -- Download Newer Files

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Demonstrates how to download all files from a SharePoint folder that are newer than the local files.

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.

    // -------------------------------------------------------------------------
    // The following comments apply to SharePoint Windows classic authentication.
    // -------------------------------------------------------------------------
    // For example, imagine our SharePoint endpoint is https://xyzoffice.mycompany.com/
    // The SHAREPOINT_NTLM_DOMAIN would be "mycompany.com"
    // The SHAREPOINT_HTTPS_DOMAIN would be "xyzoffice.mycompany.com"
    // Also, the SHAREPOINT_USERNAME would be just the name, not a full email address.
    // for example, "chilkat" instead of "chilkat@mycompany.com"

    http := chilkat.NewHttp()

    // If SharePoint Windows classic authentication is used, then set the 
    // Login, Password, LoginDomain, and NtlmAuth properties.
    http.SetLogin("SHAREPOINT_USERNAME")
    http.SetPassword("SHAREPOINT_PASSWORD")
    http.SetLoginDomain("SHAREPOINT_NTLM_DOMAIN")
    http.SetNtlmAuth(true)

    // -------------------------------------------------------------------------
    // The more common case is to use SharePoint Online authentication (via the SPOIDCRL cookie).
    // If so, do not set Login, Password, LoginDomain, and NtlmAuth, and instead
    // establish the cookie as shown at SharePoint Online Authentication
    // -------------------------------------------------------------------------

    // First we'll download a list of all the files in the /Documents folder.
    // This provides the names and last-modified date/times of the files located
    // on the SharePoint server.
    http.SetAccept("application/json;odata=verbose")
    http.SetAcceptCharset("utf-8")

    sbJson := chilkat.NewStringBuilder()
    success := http.QuickGetSb("https://SHAREPOINT_HTTPS_DOMAIN/_api/web/GetFolderByServerRelativeUrl('/Documents')/Files",sbJson)
    if success != true {
        fmt.Println(http.LastErrorText())
        http.DisposeHttp()
        sbJson.DisposeStringBuilder()
        return
    }

    // Before proceeding, make sure the local directory where we'll be downloading files exists.
    fac := chilkat.NewFileAccess()
    fac.DirEnsureExists("qa_output/sharepoint/Documents")

    // OK.. load the JSON and iterate over each file
    json := chilkat.NewJsonObject()
    json.LoadSb(sbJson)

    numFiles := json.SizeOfArray("d.results")
    fmt.Println("Number of Files in the SharePoint /Documents folder = ", numFiles)

    lastModRemote := chilkat.NewCkDateTime()
    // lastModLocal is a CkDateTime

    localPath := chilkat.NewStringBuilder()
    fileUrl := chilkat.NewStringBuilder()

    i := 0
    for i < numFiles {
        json.SetI(i)

        filename := json.StringOf("d.results[i].Name")
        sLastModified := json.StringOf("d.results[i].TimeLastModified")

        fmt.Println(i + 1, ": ", *filename, " (", *sLastModified, ")")

        lastModRemote.SetFromTimestamp(*sLastModified)

        bDownload := false
        // Check to see if the local file exists.  If not, then download.
        localPath.SetString("qa_output/sharepoint/Documents/")
        localPath.Append(*filename)
        if fac.FileExists(*localPath.GetAsString()) != true {
            fmt.Println("This file does not exist locally.")
            bDownload = true
        }
        else {
            // Get the local file's date time and compare with the remote file date/time.
            lastModLocal := fac.GetLastModified(*localPath.GetAsString())
            if fac.LastMethodSuccess() == true {
                // Get the difference in seconds between the local and remote last-modified times.
                // if the return value is negative, then the caller's time is 
                // older than the argument.  (in this case, a negative return value means
                // the local file is older than the remote file.

                // Note: The DiffSeconds method was found to be missing in the Chilkat .NET build
                // (and possibly in other builds). It will be present in the v9.5.0.67 release and later.
                numSeconds := lastModLocal.DiffSeconds(lastModRemote)
                if numSeconds < 0 {
                    fmt.Println("The local file is older than the remote file.")
                    bDownload = true
                }

                lastModLocal.DisposeCkDateTime()
            }
            else {
                fmt.Println("Unable to get the local file's last-modified date/time.")
                fmt.Println(fac.LastErrorText())
            }

        }

        if bDownload == true {
            fileUrl.SetString("https://SHAREPOINT_HTTPS_DOMAIN/_api/web/GetFolderByServerRelativeUrl('/Documents')/Files('")
            fileUrl.Append(*filename)
            fileUrl.Append("')/$value")

            fmt.Println("Downloading ", *filename)

            success = http.Download(*fileUrl.GetAsString(),*localPath.GetAsString())
            if success != true {
                fmt.Println(http.LastErrorText())
                http.DisposeHttp()
                sbJson.DisposeStringBuilder()
                fac.DisposeFileAccess()
                json.DisposeJsonObject()
                lastModRemote.DisposeCkDateTime()
                localPath.DisposeStringBuilder()
                fileUrl.DisposeStringBuilder()
                return
            }

            // Set the local file's last-modified date/time to that of the server's.
            fac.SetLastModified(*localPath.GetAsString(),lastModRemote)

        }

        i = i + 1
    }

    fmt.Println("All finished.")

    http.DisposeHttp()
    sbJson.DisposeStringBuilder()
    fac.DisposeFileAccess()
    json.DisposeJsonObject()
    lastModRemote.DisposeCkDateTime()
    localPath.DisposeStringBuilder()
    fileUrl.DisposeStringBuilder()