(Go) Bunny Sign URL and then Download using Signed URL

See more Bunny CDN Examples

Shows how to sign a URL for BunnyCDN Token Authentication and then use it to download.

For more information, see https://support.bunny.net/hc/en-us/articles/360016055099-How-to-sign-URLs-for-BunnyCDN-Token-Authentication

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

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

    var success bool
    mySecurityKey := "e7ea8d73-8fa0-44ef-a2cc-91526f7df5ed"

    url := "https://test.b-cdn.net/sample-pdf-with-images.pdf"

    // Extract the URL components.
    urlObj := chilkat.NewUrl()
    urlObj.ParseUrl(url)

    url_scheme := "https"
    if urlObj.Ssl() == false {
        url_scheme = "http"
    }

    url_host := urlObj.Host()
    url_path := urlObj.Path()

    // Calculate an expiration time 1 hour from the current date/time.
    expTime := chilkat.NewCkDateTime()
    expTime.SetFromCurrentSystemTime()
    expTime.AddSeconds(3600)
    expires := expTime.GetAsUnixTimeStr(false)

    fmt.Println("Expires = ", *expires)

    // Create the string to hash
    sbToHash := chilkat.NewStringBuilder()
    sbToHash.Append(mySecurityKey)
    sbToHash.Append(url_path)
    sbToHash.Append(*expires)

    // Base64Url encoding is the same as base64, except "-" is used instead of "+",
    // "_" is used instead of "/", and no "=" padding is added.
    token := sbToHash.GetHash("sha256","base64Url","utf-8")

    sbSignedUrl := chilkat.NewStringBuilder()
    sbSignedUrl.Append(url_scheme)
    sbSignedUrl.Append("://")
    sbSignedUrl.Append(url_host)
    sbSignedUrl.Append(url_path)
    sbSignedUrl.Append("?token=")
    sbSignedUrl.Append(*token)
    sbSignedUrl.Append("&expires=")
    sbSignedUrl.Append(*expires)

    signedUrl := sbSignedUrl.GetAsString()
    fmt.Println("Signed URL: ", *signedUrl)

    // Use the signed URL to download the file.
    http := chilkat.NewHttp()
    success = http.Download(*signedUrl,"c:/aaworkarea/sample.pdf")
    if success == false {
        fmt.Println(http.LastErrorText())
    }
    else {
        fmt.Println("Success.")
    }


    urlObj.DisposeUrl()
    expTime.DisposeCkDateTime()
    sbToHash.DisposeStringBuilder()
    sbSignedUrl.DisposeStringBuilder()
    http.DisposeHttp()