(Swift 3,4,5...) 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 Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // 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"

    let http = CkoHttp()!

    // If SharePoint Windows classic authentication is used, then set the 
    // Login, Password, LoginDomain, and NtlmAuth properties.
    http.login = "SHAREPOINT_USERNAME"
    http.password = "SHAREPOINT_PASSWORD"
    http.loginDomain = "SHAREPOINT_NTLM_DOMAIN"
    http.ntlmAuth = 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.accept = "application/json;odata=verbose"
    http.acceptCharset = "utf-8"

    let sbJson = CkoStringBuilder()!
    var success: Bool = http.quickGetSb("https://SHAREPOINT_HTTPS_DOMAIN/_api/web/GetFolderByServerRelativeUrl('/Documents')/Files", sbContent: sbJson)
    if success != true {
        print("\(http.lastErrorText!)")
        return
    }

    // Before proceeding, make sure the local directory where we'll be downloading files exists.
    let fac = CkoFileAccess()!
    fac.dirEnsureExists("qa_output/sharepoint/Documents")

    // OK.. load the JSON and iterate over each file
    let json = CkoJsonObject()!
    json.loadSb(sbJson)

    var numFiles: Int = json.size(ofArray: "d.results").intValue
    print("Number of Files in the SharePoint /Documents folder = \(numFiles)")

    let lastModRemote = CkoDateTime()!
    var lastModLocal: CkoDateTime?

    let localPath = CkoStringBuilder()!
    let fileUrl = CkoStringBuilder()!

    var i: Int = 0
    while i < numFiles {
        json.i = i

        var filename: String? = json.string(of: "d.results[i].Name")
        var sLastModified: String? = json.string(of: "d.results[i].TimeLastModified")

        print("\(i + 1): \(filename!) (\(sLastModified!))")

        lastModRemote.setFromTimestamp(sLastModified)

        var bDownload: Bool = 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 {
            print("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.
                var numSeconds: Int = lastModLocal!.diffSeconds(lastModRemote).intValue
                if numSeconds < 0 {
                    print("The local file is older than the remote file.")
                    bDownload = true
                }

                lastModLocal = nil
            }
            else {
                print("Unable to get the local file's last-modified date/time.")
                print("\(fac.lastErrorText!)")
            }

        }

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

            print("Downloading \(filename!)")

            success = http.download(fileUrl.getAsString(), saveToPath: localPath.getAsString())
            if success != true {
                print("\(http.lastErrorText!)")
                return
            }

            // Set the local file's last-modified date/time to that of the server's.
            fac.setLastModified(localPath.getAsString(), lastModified: lastModRemote)

        }

        i = i + 1
    }

    print("All finished.")

}