private static string ResolveOptionalParameter(string name, string value, WopiUrlSettings urlSettings)
{
if (urlSettings.TryGetValue(value, out var param))
{
return(name + "=" + Uri.EscapeDataString(param) + "&");
}
return(null);
}
/// <summary>
/// Generates an URL for a given file and action.
/// </summary>
/// <param name="extension">File extension used to identify a correct URL template.</param>
/// <param name="wopiFileUrl">URL of a file.</param>
/// <param name="action">Action used to identify a correct URL template.</param>
/// <param name="urlSettings">Additional URL settings (if not specified, defaults passed to the class constructor will be used).</param>
/// <returns></returns>
public async Task <string> GetFileUrlAsync(string extension, string wopiFileUrl, WopiActionEnum action, WopiUrlSettings urlSettings = null)
{
var combinedUrlSettings = new WopiUrlSettings(urlSettings.Merge(UrlSettings));
var template = await _wopiDiscoverer.GetUrlTemplateAsync(extension, action);
if (!string.IsNullOrEmpty(template))
{
// Resolve optional parameters
var url = Regex.Replace(template, @"<(?<name>\w*)=(?<value>\w*)&*>", m => ResolveOptionalParameter(m.Groups["name"].Value, m.Groups["value"].Value, combinedUrlSettings));
url = url.TrimEnd('&');
// Append mandatory parameters
url += "&WOPISrc=" + Uri.EscapeDataString(wopiFileUrl);
return(url);
}
return(null);
}
/// <summary>
/// Creates a new instance of WOPI URL generator class.
/// </summary>
/// <param name="discoverer">Provider of WOPI discovery data.</param>
/// <param name="urlSettings">Additional settings influencing behavior of the WOPI client.</param>
public WopiUrlBuilder(IDiscoverer discoverer, WopiUrlSettings urlSettings = null)
{
_wopiDiscoverer = discoverer;
UrlSettings = urlSettings;
}
