✨ Poll and its CRUD

DysonNetwork.Sphere/AppDatabase.cs

@@ -41,6 +41,10 @@ public class AppDatabase(
     public DbSet<PostTag> PostTags { get; set; }
     public DbSet<PostCategory> PostCategories { get; set; }
     public DbSet<PostCollection> PostCollections { get; set; }
+    
+    public DbSet<Poll.Poll> Polls { get; set; }
+    public DbSet<Poll.PollQuestion> PollQuestions { get; set; }
+    public DbSet<Poll.PollAnswer> PollAnswers { get; set; }
 
     public DbSet<Realm.Realm> Realms { get; set; }
     public DbSet<RealmMember> RealmMembers { get; set; }

DysonNetwork.Sphere/Migrations/20250802095248_AddPoll.cs

@@ -0,0 +1,121 @@
+using System;
+using System.Collections.Generic;
+using System.Text.Json;
+using DysonNetwork.Sphere.Poll;
+using Microsoft.EntityFrameworkCore.Migrations;
+using NodaTime;
+
+#nullable disable
+
+namespace DysonNetwork.Sphere.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddPoll : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "polls",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    title = table.Column<string>(type: "character varying(1024)", maxLength: 1024, nullable: true),
+                    description = table.Column<string>(type: "character varying(4096)", maxLength: 4096, nullable: true),
+                    ended_at = table.Column<Instant>(type: "timestamp with time zone", nullable: true),
+                    publisher_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    created_at = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
+                    updated_at = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
+                    deleted_at = table.Column<Instant>(type: "timestamp with time zone", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("pk_polls", x => x.id);
+                    table.ForeignKey(
+                        name: "fk_polls_publishers_publisher_id",
+                        column: x => x.publisher_id,
+                        principalTable: "publishers",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "poll_answers",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    answer = table.Column<Dictionary<string, JsonElement>>(type: "jsonb", nullable: false),
+                    account_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    poll_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    created_at = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
+                    updated_at = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
+                    deleted_at = table.Column<Instant>(type: "timestamp with time zone", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("pk_poll_answers", x => x.id);
+                    table.ForeignKey(
+                        name: "fk_poll_answers_polls_poll_id",
+                        column: x => x.poll_id,
+                        principalTable: "polls",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "poll_questions",
+                columns: table => new
+                {
+                    id = table.Column<Guid>(type: "uuid", nullable: false),
+                    type = table.Column<int>(type: "integer", nullable: false),
+                    options = table.Column<List<PollOption>>(type: "jsonb", nullable: true),
+                    title = table.Column<string>(type: "character varying(1024)", maxLength: 1024, nullable: false),
+                    description = table.Column<string>(type: "character varying(4096)", maxLength: 4096, nullable: true),
+                    order = table.Column<int>(type: "integer", nullable: false),
+                    is_required = table.Column<bool>(type: "boolean", nullable: false),
+                    poll_id = table.Column<Guid>(type: "uuid", nullable: false),
+                    created_at = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
+                    updated_at = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
+                    deleted_at = table.Column<Instant>(type: "timestamp with time zone", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("pk_poll_questions", x => x.id);
+                    table.ForeignKey(
+                        name: "fk_poll_questions_polls_poll_id",
+                        column: x => x.poll_id,
+                        principalTable: "polls",
+                        principalColumn: "id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "ix_poll_answers_poll_id",
+                table: "poll_answers",
+                column: "poll_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_poll_questions_poll_id",
+                table: "poll_questions",
+                column: "poll_id");
+
+            migrationBuilder.CreateIndex(
+                name: "ix_polls_publisher_id",
+                table: "polls",
+                column: "publisher_id");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "poll_answers");
+
+            migrationBuilder.DropTable(
+                name: "poll_questions");
+
+            migrationBuilder.DropTable(
+                name: "polls");
+        }
+    }
+}

DysonNetwork.Sphere/Migrations/AppDatabaseModelSnapshot.cs

@@ -1,10 +1,12 @@
 // <auto-generated />
 using System;
 using System.Collections.Generic;
+using System.Text.Json;
 using DysonNetwork.Shared.Data;
 using DysonNetwork.Sphere;
 using DysonNetwork.Sphere.Chat;
 using DysonNetwork.Sphere.Developer;
+using DysonNetwork.Sphere.Poll;
 using DysonNetwork.Sphere.WebReader;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
@@ -498,6 +500,152 @@ namespace DysonNetwork.Sphere.Migrations
                     b.ToTable("custom_app_secrets", (string)null);
                 });
 
+            modelBuilder.Entity("DysonNetwork.Sphere.Poll.Poll", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<Instant>("CreatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at");
+
+                    b.Property<Instant?>("DeletedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("deleted_at");
+
+                    b.Property<string>("Description")
+                        .HasMaxLength(4096)
+                        .HasColumnType("character varying(4096)")
+                        .HasColumnName("description");
+
+                    b.Property<Instant?>("EndedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("ended_at");
+
+                    b.Property<Guid>("PublisherId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("publisher_id");
+
+                    b.Property<string>("Title")
+                        .HasMaxLength(1024)
+                        .HasColumnType("character varying(1024)")
+                        .HasColumnName("title");
+
+                    b.Property<Instant>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at");
+
+                    b.HasKey("Id")
+                        .HasName("pk_polls");
+
+                    b.HasIndex("PublisherId")
+                        .HasDatabaseName("ix_polls_publisher_id");
+
+                    b.ToTable("polls", (string)null);
+                });
+
+            modelBuilder.Entity("DysonNetwork.Sphere.Poll.PollAnswer", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<Guid>("AccountId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("account_id");
+
+                    b.Property<Dictionary<string, JsonElement>>("Answer")
+                        .IsRequired()
+                        .HasColumnType("jsonb")
+                        .HasColumnName("answer");
+
+                    b.Property<Instant>("CreatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at");
+
+                    b.Property<Instant?>("DeletedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("deleted_at");
+
+                    b.Property<Guid>("PollId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("poll_id");
+
+                    b.Property<Instant>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at");
+
+                    b.HasKey("Id")
+                        .HasName("pk_poll_answers");
+
+                    b.HasIndex("PollId")
+                        .HasDatabaseName("ix_poll_answers_poll_id");
+
+                    b.ToTable("poll_answers", (string)null);
+                });
+
+            modelBuilder.Entity("DysonNetwork.Sphere.Poll.PollQuestion", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid")
+                        .HasColumnName("id");
+
+                    b.Property<Instant>("CreatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("created_at");
+
+                    b.Property<Instant?>("DeletedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("deleted_at");
+
+                    b.Property<string>("Description")
+                        .HasMaxLength(4096)
+                        .HasColumnType("character varying(4096)")
+                        .HasColumnName("description");
+
+                    b.Property<bool>("IsRequired")
+                        .HasColumnType("boolean")
+                        .HasColumnName("is_required");
+
+                    b.Property<List<PollOption>>("Options")
+                        .HasColumnType("jsonb")
+                        .HasColumnName("options");
+
+                    b.Property<int>("Order")
+                        .HasColumnType("integer")
+                        .HasColumnName("order");
+
+                    b.Property<Guid>("PollId")
+                        .HasColumnType("uuid")
+                        .HasColumnName("poll_id");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasMaxLength(1024)
+                        .HasColumnType("character varying(1024)")
+                        .HasColumnName("title");
+
+                    b.Property<int>("Type")
+                        .HasColumnType("integer")
+                        .HasColumnName("type");
+
+                    b.Property<Instant>("UpdatedAt")
+                        .HasColumnType("timestamp with time zone")
+                        .HasColumnName("updated_at");
+
+                    b.HasKey("Id")
+                        .HasName("pk_poll_questions");
+
+                    b.HasIndex("PollId")
+                        .HasDatabaseName("ix_poll_questions_poll_id");
+
+                    b.ToTable("poll_questions", (string)null);
+                });
+
             modelBuilder.Entity("DysonNetwork.Sphere.Post.Post", b =>
                 {
                     b.Property<Guid>("Id")
@@ -1592,6 +1740,42 @@ namespace DysonNetwork.Sphere.Migrations
                     b.Navigation("App");
                 });
 
+            modelBuilder.Entity("DysonNetwork.Sphere.Poll.Poll", b =>
+                {
+                    b.HasOne("DysonNetwork.Sphere.Publisher.Publisher", "Publisher")
+                        .WithMany("Polls")
+                        .HasForeignKey("PublisherId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_polls_publishers_publisher_id");
+
+                    b.Navigation("Publisher");
+                });
+
+            modelBuilder.Entity("DysonNetwork.Sphere.Poll.PollAnswer", b =>
+                {
+                    b.HasOne("DysonNetwork.Sphere.Poll.Poll", "Poll")
+                        .WithMany()
+                        .HasForeignKey("PollId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_poll_answers_polls_poll_id");
+
+                    b.Navigation("Poll");
+                });
+
+            modelBuilder.Entity("DysonNetwork.Sphere.Poll.PollQuestion", b =>
+                {
+                    b.HasOne("DysonNetwork.Sphere.Poll.Poll", "Poll")
+                        .WithMany("Questions")
+                        .HasForeignKey("PollId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired()
+                        .HasConstraintName("fk_poll_questions_polls_poll_id");
+
+                    b.Navigation("Poll");
+                });
+
             modelBuilder.Entity("DysonNetwork.Sphere.Post.Post", b =>
                 {
                     b.HasOne("DysonNetwork.Sphere.Post.Post", "ForwardedPost")
@@ -1837,6 +2021,11 @@ namespace DysonNetwork.Sphere.Migrations
                     b.Navigation("Secrets");
                 });
 
+            modelBuilder.Entity("DysonNetwork.Sphere.Poll.Poll", b =>
+                {
+                    b.Navigation("Questions");
+                });
+
             modelBuilder.Entity("DysonNetwork.Sphere.Post.Post", b =>
                 {
                     b.Navigation("Reactions");
@@ -1850,6 +2039,8 @@ namespace DysonNetwork.Sphere.Migrations
 
                     b.Navigation("Members");
 
+                    b.Navigation("Polls");
+
                     b.Navigation("Posts");
 
                     b.Navigation("Subscriptions");

DysonNetwork.Sphere/Poll/Poll.cs

@@ -0,0 +1,64 @@
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using NodaTime;
+
+namespace DysonNetwork.Sphere.Poll;
+
+public class Poll : ModelBase
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public List<PollQuestion> Questions { get; set; } = new();
+    
+    [MaxLength(1024)] public string? Title { get; set; }
+    [MaxLength(4096)] public string? Description { get; set; }
+    
+    public Instant? EndedAt { get; set; }
+    
+    public Guid PublisherId { get; set; }
+    public Publisher.Publisher Publisher { get; set; } = null!;
+}
+
+public enum PollQuestionType
+{
+    SingleChoice,
+    MultipleChoice,
+    YesNo,
+    Rating,
+    FreeText
+}
+
+public class PollQuestion : ModelBase
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    
+    public PollQuestionType Type { get; set; }
+    [Column(TypeName = "jsonb")] public List<PollOption>? Options { get; set; }
+    
+    [MaxLength(1024)] public string Title { get; set; } = null!;
+    [MaxLength(4096)] public string? Description { get; set; }
+    public int Order { get; set; } = 0;
+    public bool IsRequired { get; set; }
+    
+    public Guid PollId { get; set; }
+    [JsonIgnore] public Poll Poll { get; set; } = null!;
+}
+
+public class PollOption
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    [Required] [MaxLength(1024)] public string Label { get; set; } = null!;
+    [MaxLength(4096)] public string? Description { get; set; }
+    public int Order { get; set; } = 0;
+}
+
+public class PollAnswer : ModelBase
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    [Column(TypeName = "jsonb")] public Dictionary<string, JsonElement> Answer { get; set; } = null!;
+    
+    public Guid AccountId { get; set; }
+    public Guid PollId { get; set; }
+    [JsonIgnore] public Poll Poll { get; set; } = null!;
+}

DysonNetwork.Sphere/Poll/PollController.cs

@@ -0,0 +1,189 @@
+using DysonNetwork.Shared.Proto;
+using DysonNetwork.Sphere.Publisher;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using NodaTime;
+
+namespace DysonNetwork.Sphere.Poll;
+
+[ApiController]
+[Route("/api/polls")]
+public class PollController(AppDatabase db, PollService polls, PublisherService pub) : ControllerBase
+{
+    [HttpGet("me")]
+    [Authorize]
+    public async Task<ActionResult<List<Poll>>> ListPolls(
+        [FromQuery] bool active = false,
+        [FromQuery] int offset = 0,
+        [FromQuery] int take = 20
+    )
+    {
+        if (HttpContext.Items["CurrentUser"] is not Account currentUser) return Unauthorized();
+        var accountId = Guid.Parse(currentUser.Id);
+        var publishers = (await pub.GetUserPublishers(accountId)).Select(p => p.Id).ToList();
+
+        var now = SystemClock.Instance.GetCurrentInstant();
+        var query = db.Polls
+            .Where(e => publishers.Contains(e.PublisherId));
+        if (active) query = query.Where(e => e.EndedAt > now);
+
+        var totalCount = await query.CountAsync();
+        HttpContext.Response.Headers.Append("X-Total", totalCount.ToString());
+
+        var polls = await query
+            .Skip(offset)
+            .Take(take)
+            .ToListAsync();
+        return Ok(polls);
+    }
+
+    public class PollRequest
+    {
+        public string? Title { get; set; }
+        public string? Description { get; set; }
+        public Instant? EndedAt { get; set; }
+        public List<PollQuestion>? Questions { get; set; }
+    }
+
+    [HttpPost]
+    [Authorize]
+    public async Task<ActionResult<Poll>> CreatePoll([FromBody] PollRequest request, [FromQuery] string pubName)
+    {
+        if (request.Questions is null) return BadRequest("Questions are required.");
+        if (HttpContext.Items["CurrentUser"] is not Account currentUser) return Unauthorized();
+        var accountId = Guid.Parse(currentUser.Id);
+
+        var publisher = await pub.GetPublisherByName(pubName);
+        if (publisher is null) return BadRequest("Publisher was not found.");
+        if (!await pub.IsMemberWithRole(publisher.Id, accountId, PublisherMemberRole.Editor))
+            return StatusCode(403, "You need at least be an editor to create polls as this publisher.");
+
+        var poll = new Poll
+        {
+            Title = request.Title,
+            Description = request.Description,
+            EndedAt = request.EndedAt,
+            PublisherId = publisher.Id,
+            Questions = request.Questions
+        };
+
+        try
+        {
+            polls.ValidatePoll(poll);
+        }
+        catch (Exception ex)
+        {
+            return BadRequest(ex.Message);
+        }
+
+        db.Polls.Add(poll);
+        await db.SaveChangesAsync();
+        return Ok(poll);
+    }
+
+    [HttpPatch("{id:guid}")]
+    [Authorize]
+    public async Task<ActionResult<Poll>> UpdatePoll(Guid id, [FromBody] PollRequest request)
+    {
+        if (HttpContext.Items["CurrentUser"] is not Account currentUser) return Unauthorized();
+        var accountId = Guid.Parse(currentUser.Id);
+        
+        // Start a transaction
+        await using var transaction = await db.Database.BeginTransactionAsync();
+        
+        try
+        {
+            var poll = await db.Polls
+                .Include(p => p.Questions)
+                .FirstOrDefaultAsync(p => p.Id == id);
+                
+            if (poll == null) return NotFound("Poll not found");
+            
+            // Check if user is an editor of the publisher that owns the poll
+            if (!await pub.IsMemberWithRole(poll.PublisherId, accountId, PublisherMemberRole.Editor))
+                return StatusCode(403, "You need to be at least an editor to update this poll.");
+            
+            // Update properties if they are provided in the request
+            if (request.Title != null) poll.Title = request.Title;
+            if (request.Description != null) poll.Description = request.Description;
+            if (request.EndedAt.HasValue) poll.EndedAt = request.EndedAt;
+            
+            // Update questions if provided
+            if (request.Questions != null)
+            {
+                // Remove existing questions
+                db.PollQuestions.RemoveRange(poll.Questions);
+                
+                // Add new questions
+                poll.Questions = request.Questions;
+            }
+
+            polls.ValidatePoll(poll);
+            
+            poll.UpdatedAt = SystemClock.Instance.GetCurrentInstant();
+            await db.SaveChangesAsync();
+            
+            // Commit the transaction if all operations succeed
+            await transaction.CommitAsync();
+            
+            return Ok(poll);
+        }
+        catch (Exception ex)
+        {
+            await transaction.RollbackAsync();
+            return BadRequest(ex.Message);
+        }
+    }
+
+    [HttpDelete("{id:guid}")]
+    [Authorize]
+    public async Task<IActionResult> DeletePoll(Guid id)
+    {
+        if (HttpContext.Items["CurrentUser"] is not Account currentUser) return Unauthorized();
+        var accountId = Guid.Parse(currentUser.Id);
+        
+        // Start a transaction
+        await using var transaction = await db.Database.BeginTransactionAsync();
+        
+        try
+        {
+            var poll = await db.Polls
+                .Include(p => p.Questions)
+                .FirstOrDefaultAsync(p => p.Id == id);
+                
+            if (poll == null) return NotFound("Poll not found");
+            
+            // Check if user is an editor of the publisher that owns the poll
+            if (!await pub.IsMemberWithRole(poll.PublisherId, accountId, PublisherMemberRole.Editor))
+                return StatusCode(403, "You need to be at least an editor to delete this poll.");
+            
+            // Delete all answers for this poll
+            var answers = await db.PollAnswers
+                .Where(a => a.PollId == id)
+                .ToListAsync();
+            
+            if (answers.Count != 0)
+                db.PollAnswers.RemoveRange(answers);
+            
+            // Delete all questions for this poll
+            if (poll.Questions.Count != 0)
+                db.PollQuestions.RemoveRange(poll.Questions);
+            
+            // Finally, delete the poll itself
+            db.Polls.Remove(poll);
+            
+            await db.SaveChangesAsync();
+            
+            // Commit the transaction if all operations succeed
+            await transaction.CommitAsync();
+            
+            return NoContent();
+        }
+        catch (Exception ex)
+        {
+            await transaction.RollbackAsync();
+            return StatusCode(500, "An error occurred while deleting the poll... " + ex.Message);
+        }
+    }
+}

DysonNetwork.Sphere/Poll/PollService.cs

@@ -0,0 +1,149 @@
+using System.Text.Json;
+using DysonNetwork.Shared.Cache;
+using Microsoft.EntityFrameworkCore;
+using NodaTime;
+
+namespace DysonNetwork.Sphere.Poll;
+
+public class PollService(AppDatabase db, ICacheService cache)
+{
+    public void ValidatePoll(Poll poll)
+    {
+        if (poll.Questions.Count == 0)
+            throw new Exception("Poll must have at least one question");
+        foreach (var question in poll.Questions)
+        {
+            switch (question.Type)
+            {
+                case PollQuestionType.SingleChoice:
+                case PollQuestionType.MultipleChoice:
+                    if (question.Options is null)
+                        throw new Exception("Poll question must have options");
+                    if (question.Options.Count <= 1)
+                        throw new Exception("Poll question must have at least two options");
+                    break;
+                case PollQuestionType.YesNo:
+                case PollQuestionType.Rating:
+                case PollQuestionType.FreeText:
+                default:
+                    continue;
+            }
+        }
+    }
+
+    private const string PollAnswerCachePrefix = "poll:answer:";
+
+    public async Task<PollAnswer?> GetPollAnswer(Guid pollId, Guid accountId)
+    {
+        var cacheKey = $"poll:answer:{pollId}:{accountId}";
+        var cachedAnswer = await cache.GetAsync<PollAnswer?>(cacheKey);
+        if (cachedAnswer is not null)
+            return cachedAnswer;
+
+        var answer = await db.PollAnswers
+            .Where(e => e.PollId == pollId && e.AccountId == accountId)
+            .FirstOrDefaultAsync();
+
+        if (answer is not null)
+        {
+            await cache.SetAsync(cacheKey, answer, TimeSpan.FromMinutes(30));
+        }
+
+        return answer;
+    }
+
+    private async Task ValidatePollAnswer(Guid pollId, Dictionary<string, JsonElement> answer)
+    {
+        var questions = await db.PollQuestions
+            .Where(e => e.PollId == pollId)
+            .ToListAsync();
+        if (questions is null)
+            throw new Exception("Poll has no questions");
+
+        foreach (var question in questions)
+        {
+            var questionId = question.Id.ToString();
+            if (question.IsRequired && !answer.ContainsKey(questionId))
+                throw new Exception($"Missing required field: {question.Title}");
+            switch (question.Type)
+            {
+                case PollQuestionType.Rating when answer[questionId].ValueKind != JsonValueKind.Number:
+                    throw new Exception($"Answer for question {question.Title} expected to be a number");
+                case PollQuestionType.FreeText when answer[questionId].ValueKind != JsonValueKind.String:
+                    throw new Exception($"Answer for question {question.Title} expected to be a string");
+                case PollQuestionType.SingleChoice when question.Options is not null:
+                    if (answer[questionId].ValueKind != JsonValueKind.String)
+                        throw new Exception($"Answer for question {question.Title} expected to be a string");
+                    if (question.Options.All(e => e.Id.ToString() != answer[questionId].GetString()))
+                        throw new Exception($"Answer for question {question.Title} is invalid");
+                    break;
+                case PollQuestionType.MultipleChoice when question.Options is not null:
+                    if (answer[questionId].ValueKind != JsonValueKind.Array)
+                        throw new Exception($"Answer for question {question.Title} expected to be an array");
+                    if (answer[questionId].EnumerateArray().Any(option =>
+                            question.Options.All(e => e.Id.ToString() != option.GetString())))
+                        throw new Exception($"Answer for question {question.Title} is invalid");
+                    break;
+                case PollQuestionType.YesNo when answer[questionId].ValueKind != JsonValueKind.True &&
+                                                 answer[questionId].ValueKind != JsonValueKind.False:
+                    throw new Exception($"Answer for question {question.Title} expected to be a boolean");
+                default:
+                    throw new ArgumentOutOfRangeException();
+            }
+        }
+    }
+
+    public async Task<PollAnswer> AnswerPoll(Guid pollId, Guid accountId, Dictionary<string, JsonElement> answer)
+    {
+        // Validation
+        var poll = await db.Polls
+            .Where(e => e.Id == pollId)
+            .FirstOrDefaultAsync();
+        if (poll is null)
+            throw new Exception("Poll not found");
+        if (poll.EndedAt < SystemClock.Instance.GetCurrentInstant())
+            throw new Exception("Poll has ended");
+
+        await ValidatePollAnswer(pollId, answer);
+
+        // Remove the existing answer
+        var existingAnswer = await db.PollAnswers
+            .Where(e => e.PollId == pollId && e.AccountId == accountId)
+            .FirstOrDefaultAsync();
+        if (existingAnswer is not null)
+            await UnAnswerPoll(pollId, accountId);
+
+        // Save the new answer
+        var answerRecord = new PollAnswer
+        {
+            PollId = pollId,
+            AccountId = accountId,
+            Answer = answer
+        };
+        await db.PollAnswers.AddAsync(answerRecord);
+        await db.SaveChangesAsync();
+
+        // Invalidate the cache for this poll answer
+        var cacheKey = $"poll:answer:{pollId}:{accountId}";
+        await cache.SetAsync(cacheKey, answerRecord, TimeSpan.FromMinutes(30));
+
+        return answerRecord;
+    }
+
+    public async Task<bool> UnAnswerPoll(Guid pollId, Guid accountId)
+    {
+        var now = SystemClock.Instance.GetCurrentInstant();
+        var result = await db.PollAnswers
+            .Where(e => e.PollId == pollId && e.AccountId == accountId)
+            .ExecuteUpdateAsync(s => s.SetProperty(e => e.DeletedAt, now)) > 0;
+
+        if (result)
+        {
+            // Remove the cached answer if it exists
+            var cacheKey = $"poll:answer:{pollId}:{accountId}";
+            await cache.RemoveAsync(cacheKey);
+        }
+
+        return result;
+    }
+}

DysonNetwork.Sphere/Post/PostController.cs

@@ -282,7 +282,7 @@ public class PostController(
     public async Task<ActionResult<Post>> CreatePost(
         [FromBody] PostRequest request,
         [FromQuery(Name = "pub")] [FromHeader(Name = "X-Pub")]
-        string? publisherName
+        string? pubName
     )
     {
         request.Content = TextSanitizer.Sanitize(request.Content);
@@ -293,7 +293,7 @@ public class PostController(
         var accountId = Guid.Parse(currentUser.Id);
 
         Publisher.Publisher? publisher;
-        if (publisherName is null)
+        if (pubName is null)
         {
             // Use the first personal publisher
             publisher = await db.Publishers.FirstOrDefaultAsync(e =>
@@ -301,13 +301,9 @@ public class PostController(
         }
         else
         {
-            publisher = await db.Publishers.FirstOrDefaultAsync(e => e.Name == publisherName);
+            publisher = await pub.GetPublisherByName(pubName);
             if (publisher is null) return BadRequest("Publisher was not found.");
-            var member =
-                await db.PublisherMembers.FirstOrDefaultAsync(e =>
-                    e.AccountId == accountId && e.PublisherId == publisher.Id);
-            if (member is null) return StatusCode(403, "You even wasn't a member of the publisher you specified.");
-            if (member.Role < PublisherMemberRole.Editor)
+            if(!await pub.IsMemberWithRole(publisher.Id, accountId, PublisherMemberRole.Editor))
                 return StatusCode(403, "You need at least be an editor to post as this publisher.");
         }
 

DysonNetwork.Sphere/Publisher/Publisher.cs

@@ -35,6 +35,7 @@ public class Publisher : ModelBase, IIdentifiedResource
     [Column(TypeName = "jsonb")] public VerificationMark? Verification { get; set; }
 
     [JsonIgnore] public ICollection<Post.Post> Posts { get; set; } = new List<Post.Post>();
+    [JsonIgnore] public ICollection<Poll.Poll> Polls { get; set; } = new List<Poll.Poll>();
     [JsonIgnore] public ICollection<PostCollection> Collections { get; set; } = new List<PostCollection>();
     [JsonIgnore] public ICollection<PublisherMember> Members { get; set; } = new List<PublisherMember>();
     [JsonIgnore] public ICollection<PublisherFeature> Features { get; set; } = new List<PublisherFeature>();

DysonNetwork.Sphere/Startup/ServiceCollectionExtensions.cs

@@ -19,6 +19,7 @@ using DysonNetwork.Shared.GeoIp;
 using DysonNetwork.Sphere.WebReader;
 using DysonNetwork.Sphere.Developer;
 using DysonNetwork.Sphere.Discovery;
+using DysonNetwork.Sphere.Poll;
 using DysonNetwork.Sphere.Translation;
 
 namespace DysonNetwork.Sphere.Startup;
@@ -167,6 +168,7 @@ public static class ServiceCollectionExtensions
         services.AddScoped<WebFeedService>();
         services.AddScoped<DiscoveryService>();
         services.AddScoped<CustomAppService>();
+        services.AddScoped<PollService>();
 
         var translationProvider = configuration["Translation:Provider"]?.ToLower();
         switch (translationProvider)