decePubClient/Models/ProfileForm.cs

using decePubClient.Models.Mastodon;
using decePubClient.Models.Types;

namespace decePubClient.Models
{
	/// <summary>
	/// The persona's profile as Settings edits it, which is what update_credentials takes: the words as written (its
	/// account's Source), the flags, the posting defaults, and a new avatar or header when one was picked. Fields always
	/// holds FieldCount rows; a row without a name is dropped.
	/// </summary>
	public class ProfileForm
	{
		public const int FieldCount = 4;
		public const int DisplayNameLength = 30;
		public const int NoteLength = 500;
		public const int FieldLength = 255;

		public string DisplayName { get; set; }
		public string Note { get; set; }
		public bool Locked { get; set; }
		public bool Bot { get; set; }
		public bool Discoverable { get; set; }
		public bool Indexable { get; set; }
		public Visibility Privacy { get; set; } = Visibility.Public;
		public bool Sensitive { get; set; }
		public string Language { get; set; }
		public QuotePolicy QuotePolicy { get; set; } = QuotePolicy.Public;
		public List<AccountField> Fields { get; set; } = [];
		public UploadMedia Avatar { get; set; }
		public UploadMedia Header { get; set; }

		public static ProfileForm Of(Account account)
		{
			var source = account.Source ?? new();
			var fields = source.Fields.Count > 0 ? source.Fields : account.Fields;
			return new()
			{
				DisplayName = account.DisplayName,
				Note = source.Note,
				Locked = account.Locked,
				Bot = account.Bot,
				Discoverable = account.Discoverable == true,
				Indexable = account.Indexable == true,
				Privacy = source.Privacy switch
				{
					"private" => Visibility.FollowersOnly,
					"unlisted" => Visibility.Unlisted,
					_ => Visibility.Public
				},
				Sensitive = source.Sensitive,
				Language = source.Language,
				QuotePolicy = source.QuotePolicy switch
				{
					"followers" => QuotePolicy.Followers,
					"nobody" => QuotePolicy.Nobody,
					_ => QuotePolicy.Public
				},
				Fields = [.. fields.Take(FieldCount).Select(f => new AccountField { Name = f.Name, Value = f.Value }),
					.. Enumerable.Range(0, Math.Max(0, FieldCount - fields.Count)).Select(_ => new AccountField())]
			};
		}

		/// <summary>The form as update_credentials reads it, with the pictures as files.</summary>
		public MultipartFormDataContent Content()
		{
			var content = new MultipartFormDataContent
			{
				{ new StringContent(DisplayName?.Trim() ?? ""), "display_name" },
				{ new StringContent(Note ?? ""), "note" },
				{ new StringContent(Flag(Locked)), "locked" },
				{ new StringContent(Flag(Bot)), "bot" },
				{ new StringContent(Flag(Discoverable)), "discoverable" },
				{ new StringContent(Flag(Indexable)), "indexable" },
				{ new StringContent(Privacy switch { Visibility.FollowersOnly => "private", Visibility.Unlisted => "unlisted", _ => "public" }), "source[privacy]" },
				{ new StringContent(Flag(Sensitive)), "source[sensitive]" },
				{ new StringContent(Language ?? ""), "source[language]" },
				{ new StringContent(QuotePolicy switch { QuotePolicy.Followers => "followers", QuotePolicy.Nobody => "nobody", _ => "public" }), "source[quote_policy]" }
			};
			// every row is sent, so a row emptied here is removed there
			for (var i = 0; i < Fields.Count; i++)
			{
				content.Add(new StringContent(Fields[i].Name?.Trim() ?? ""), $"fields_attributes[{i}][name]");
				content.Add(new StringContent(Fields[i].Value?.Trim() ?? ""), $"fields_attributes[{i}][value]");
			}
			if (Avatar is not null)
				content.Add(Picture(Avatar), "avatar", Avatar.FileName);
			if (Header is not null)
				content.Add(Picture(Header), "header", Header.FileName);
			return content;
		}

		static string Flag(bool value) => value ? "true" : "false";

		// PrivaPub keeps pictures up to this size and resizes them
		public const long MaximumPictureSize = 20 * 1024 * 1024;

		// streamed from the browser's file, read again for each attempt
		static StreamContent Picture(UploadMedia media)
		{
			var picture = new StreamContent(media.File.OpenReadStream(MaximumPictureSize));
			picture.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(media.ContentType);
			return picture;
		}
	}
}