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Use a proper user agent when fetching images

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This commit is contained in:
Ske 2021-08-23 22:53:58 +02:00
parent 55c56c4e58
commit 41427db178
10 changed files with 106 additions and 87 deletions
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47
PluralKit.Bot/Utils/AvatarUtils.cs
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@ -10,7 +10,7 @@ using SixLabors.ImageSharp;
namespace PluralKit.Bot {
public static class AvatarUtils {
public static async Task VerifyAvatarOrThrow(string url, bool isFullSizeImage = false)
public static async Task VerifyAvatarOrThrow(HttpClient client, string url, bool isFullSizeImage = false)
{
if (url.Length > Limits.MaxUriLength)
throw Errors.UrlTooLong(url);
@ -24,35 +24,32 @@ namespace PluralKit.Bot {
// TODO: add image/webp once ImageSharp supports this
};
using (var client = new HttpClient())
{
if (!PluralKit.Core.MiscUtils.TryMatchUri(url, out var uri))
throw Errors.InvalidUrl(url);
if (!PluralKit.Core.MiscUtils.TryMatchUri(url, out var uri))
throw Errors.InvalidUrl(url);
url = TryRewriteCdnUrl(url);
url = TryRewriteCdnUrl(url);
var response = await client.GetAsync(url);
if (!response.IsSuccessStatusCode) // Check status code
throw Errors.AvatarServerError(response.StatusCode);
if (response.Content.Headers.ContentLength == null) // Check presence of content length
throw Errors.AvatarNotAnImage(null);
if (!acceptableMimeTypes.Contains(response.Content.Headers.ContentType.MediaType)) // Check MIME type
throw Errors.AvatarNotAnImage(response.Content.Headers.ContentType.MediaType);
var response = await client.GetAsync(url);
if (!response.IsSuccessStatusCode) // Check status code
throw Errors.AvatarServerError(response.StatusCode);
if (response.Content.Headers.ContentLength == null) // Check presence of content length
throw Errors.AvatarNotAnImage(null);
if (!acceptableMimeTypes.Contains(response.Content.Headers.ContentType.MediaType)) // Check MIME type
throw Errors.AvatarNotAnImage(response.Content.Headers.ContentType.MediaType);
if (isFullSizeImage)
// no need to do size checking on banners
return;
if (isFullSizeImage)
// no need to do size checking on banners
return;
if (response.Content.Headers.ContentLength > Limits.AvatarFileSizeLimit) // Check content length
throw Errors.AvatarFileSizeLimit(response.Content.Headers.ContentLength.Value);
if (response.Content.Headers.ContentLength > Limits.AvatarFileSizeLimit) // Check content length
throw Errors.AvatarFileSizeLimit(response.Content.Headers.ContentLength.Value);
// Parse the image header in a worker
var stream = await response.Content.ReadAsStreamAsync();
var image = await Task.Run(() => Image.Identify(stream));
if (image == null) throw Errors.AvatarInvalid;
if (image.Width > Limits.AvatarDimensionLimit || image.Height > Limits.AvatarDimensionLimit) // Check image size
throw Errors.AvatarDimensionsTooLarge(image.Width, image.Height);
}
// Parse the image header in a worker
var stream = await response.Content.ReadAsStreamAsync();
var image = await Task.Run(() => Image.Identify(stream));
if (image == null) throw Errors.AvatarInvalid;
if (image.Width > Limits.AvatarDimensionLimit || image.Height > Limits.AvatarDimensionLimit) // Check image size
throw Errors.AvatarDimensionsTooLarge(image.Width, image.Height);
}
// Rewrite cdn.discordapp.com URLs to media.discordapp.net for jpg/png files