64 lines
2.7 KiB
C#
64 lines
2.7 KiB
C#
 
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using MongoDB.Driver;
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using MongoDB.Entities;
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namespace PrivaPub.Models
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{
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// The server's first-time setup (owner decision 2026-10-16): while no administrator exists, the client's setup page makes
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// the first login, which becomes the administrator; this document then closes setup for good, whoever is demoted or
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// deleted later (the CLI stays the way back). The first request to insert it wins, so two setups at once make one
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// administrator. A backup never holds it and a restore never drops it (ServerBackup.Excluded): a restore tombstones an
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// administrator made after the backup, and setup would otherwise be open to whoever came first.
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public class ServerSetup : Entity
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{
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public const string Name = "setup";
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public string AdminId { get; set; }//null while the claiming request is still making its login
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public DateTime SealedAt { get; set; }
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public static async Task<bool> IsPending(CancellationToken token) =>
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!await DB.Default.Find<ServerSetup>().Match(s => s.ID == Name).ExecuteAnyAsync(token);
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/// <summary>Takes the setup for one request: false when it is done, or another request took it first.</summary>
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public static async Task<bool> Claim(CancellationToken token)
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{
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try
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{
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await DB.Default.InsertAsync(new ServerSetup { ID = Name, SealedAt = DateTime.UtcNow }, token);
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return true;
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}
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catch (MongoWriteException ex) when (ex.WriteError?.Category == ServerErrorCategory.DuplicateKey)
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{
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return false;
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}
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}
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/// <summary>Names the administrator the claiming request made.</summary>
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public static Task Claimed(string adminId, CancellationToken token) =>
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DB.Default.Update<ServerSetup>().Match(s => s.ID == Name && s.AdminId == null).Modify(s => s.AdminId, adminId).ExecuteAsync(token);
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/// <summary>Gives a claim back when its login couldn't be made; a named administrator is never given back.</summary>
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public static Task Release() =>
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DB.Default.DeleteAsync<ServerSetup>(s => s.ID == Name && s.AdminId == null);//a delete takes no token outside a transaction
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/// <summary>Closes setup for an administrator made elsewhere (the CLI, a server that had one already).</summary>
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public static async Task Seal(string adminId, CancellationToken token)
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{
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try
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{
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await DB.Default.Update<ServerSetup>().Match(s => s.ID == Name)
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.Modify(b => b.SetOnInsert(s => s.AdminId, adminId))
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.Modify(b => b.SetOnInsert(s => s.SealedAt, DateTime.UtcNow))
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.Option(o => o.IsUpsert = true)
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.ExecuteAsync(token);
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}
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catch (MongoCommandException ex) when (ex.Code == 11000)
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{
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//sealed meanwhile
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}
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catch (MongoWriteException ex) when (ex.WriteError?.Category == ServerErrorCategory.DuplicateKey)
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{
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//sealed meanwhile
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}
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}
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}
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}
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