public void GetStringSha1Hash_Test()
{
var expected1 = "4a48f2d80b881e9ac7d607f23412823e9305e433";
var sha1_1 = ShaUtil.GetHex16StringSha1Hash("HelloChinese");
Assert.Equal(expected1, sha1_1, ignoreCase: true);
var expected2 = "Skjy2AuIHprH1gfyNBKCPpMF5DM=";
var sha1_2 = ShaUtil.GetBase64StringSha1Hash("HelloChinese");
Assert.Equal(expected2, sha1_2, ignoreCase: true);
}
/// <summary>获取图片的二进制数据
/// </summary>
/// <param name="imagePath">图片保存路径</param>
/// <param name="resizeParameter">图片尺寸调整参数</param>
/// <param name="lastWriteTimeUtc">最后修改时间</param>
/// <returns></returns>
public async Task <byte[]> GetImageData(string imagePath, ResizeParameter resizeParameter, DateTime lastWriteTimeUtc)
{
try
{
var key = $"{imagePath}{resizeParameter.ToString()}{lastWriteTimeUtc.ToString("yyyy-MM-dd HH:mm:ss")}";
var cacheKey = $"Image:{ShaUtil.GetHex16StringSha1Hash(key)}";
byte[] imageBytes;
if (_option.EnableImageCache)
{
var imageCacheItem = await _imageCache.GetAsync(cacheKey);
if (imageCacheItem != null)
{
return(imageCacheItem.Data);
}
}
//图片操作
var image = Image.FromFile(imagePath);
//对图片进行相应的操作,放大等
Image resizeImage = null;
if (resizeParameter.Mode == ResizeMode.Zoom)
{
resizeImage = ImageResize.ImageResizer.Zoom(image, resizeParameter);
}
else if (resizeParameter.Mode == ResizeMode.Crop)
{
//图片裁剪
resizeImage = ImageResize.ImageResizer.Crop(image, resizeParameter);
}
var imageFormat = ImageUtil.GetImageFormatByFormatName(resizeParameter.Format);
imageBytes = ImageHelper.ImageCompressToBytes(resizeImage, resizeParameter.Quality, imageFormat);
image.Dispose();
//只有开启图片缓存情况下,才会对图片再次进行缓存
if (_option.EnableImageCache)
{
//将图片缓存
await _imageCache.SetAsync(cacheKey, new ImageCacheItem(imageBytes), new DistributedCacheEntryOptions()
{
SlidingExpiration = TimeSpan.FromSeconds(_option.ImageCacheSlidingExpirationSeconds)
});
}
return(imageBytes);
}
catch (Exception ex)
{
_logger.LogError("Resize图片出现错误,{0}", ex.Message);
}
return(default);