/// <summary>
/// Add a strong ETag if <paramref name="savedData"/> supports it
/// </summary>
/// <param name="savedData">The data to add the ETag for</param>
/// <exception cref="ArgumentNullException"><paramref name="savedData"/> is <see langword="null"/></exception>
public bool TryAddStrongETagForModel(object savedData)
{
if (!ETagService.TryGetStrongETag(savedData, out var eTag))
{
return(false);
}
AddETag(eTag);
return(true);
}
/// <summary>
/// Add a weak ETag for <paramref name="savedData"/>
/// </summary>
/// <param name="savedData">The data to add the ETag for</param>
/// <exception cref="ArgumentNullException"><paramref name="savedData"/> is <see langword="null"/></exception>
public void AddWeakETagForModel(object savedData)
{
if (savedData is null)
{
throw new ArgumentNullException(nameof(savedData));
}
var eTag = ETagService.GetWeakETag(savedData);
AddETag(eTag);
}
/// <summary>
/// Get whether a data model should be updated
/// </summary>
/// <param name="savedData">The data model to check</param>
/// <returns>Whether the data model should be updated</returns>
/// <exception cref="ArgumentNullException"><paramref name="savedData"/> is <see langword="null"/></exception>
public bool ShouldUpdate(object savedData)
{
if (!RequestHeaders.TryGetValue(IfMatchKey, out Microsoft.Extensions.Primitives.StringValues eTags) || eTags.Count == 0)
{
// ETags not in use
return(true);
}
ETagMatchResult result = ETagService.CheckETags(eTags[0], savedData);
return
(result == ETagMatchResult.ETagNotInRequest ||
(result & ETagMatchResult.Match) != 0);
}
