discord: add /random command.

app/controllers/posts_controller.rb

@@ -88,7 +88,7 @@ class PostsController < ApplicationController
   end
 
   def random
-    @post = Post.user_tag_match(params[:tags]).random
+    @post = Post.user_tag_match(params[:tags]).random(1).first
     raise ActiveRecord::RecordNotFound if @post.nil?
     authorize @post
     respond_with(@post) do |format|

app/logical/discord_api_client.rb

@@ -22,16 +22,20 @@ class DiscordApiClient
     post("/applications/#{application_id}/guilds/#{guild_id}/commands", json)
   end
 
-  def get_channel(channel_id)
-    get("/channels/#{channel_id}")
+  def get_channel(channel_id, **options)
+    get("/channels/#{channel_id}", **options)
   end
 
-  def me
-    get("/users/@me")
+  def me(**options)
+    get("/users/@me", **options)
   end
 
-  def get(url)
-    client.get("#{BASE_URL}/#{url}").parse
+  def get(url, cache: nil, **options)
+    if cache
+      client.cache(cache).get("#{BASE_URL}/#{url}").parse
+    else
+      client.get("#{BASE_URL}/#{url}").parse
+    end
   end
 
   def post(url, data)

app/logical/discord_slash_command.rb

@@ -4,6 +4,7 @@ class DiscordSlashCommand
   COMMANDS = {
     count: DiscordSlashCommand::CountCommand,
     posts: DiscordSlashCommand::PostsCommand,
+    random: DiscordSlashCommand::RandomCommand,
   }
 
   # https://discord.com/developers/docs/interactions/slash-commands#interaction-interactiontype
@@ -15,6 +16,7 @@ class DiscordSlashCommand
   # https://discord.com/developers/docs/interactions/slash-commands#applicationcommandoptiontype
   module ApplicationCommandOptionType
     String = 3
+    Integer = 4
   end
 
   attr_reader :data, :discord
@@ -51,14 +53,19 @@ class DiscordSlashCommand
   concerning :HelperMethods do
     # The parameters passed to the command. A hash.
     def params
-      @params ||= data.dig(:data, :options).map do |opt|
+      @params ||= data.dig(:data, :options).to_a.map do |opt|
         [opt[:name], opt[:value]]
       end.to_h.with_indifferent_access
     end
 
     # https://discord.com/developers/docs/interactions/slash-commands#responding-to-an-interaction
     # https://discord.com/developers/docs/interactions/slash-commands#interaction-response
-    def respond_with(content = nil, type: 4, **options)
+    def respond_with(content = nil, type: 4, posts: [], **options)
+      if posts.present?
+        embeds = posts.map { |post| DiscordSlashCommand::PostEmbed.new(post, self).to_h }
+        options[:embeds] = embeds
+      end
+
       {
         type: type,
         data: {
@@ -68,6 +75,10 @@ class DiscordSlashCommand
       }
     end
 
+    def channel
+      discord.get_channel(data[:channel_id], cache: 1.minute)
+    end
+
     # Register the command with the Discord API (replacing it if it already exists).
     # https://discord.com/developers/docs/interactions/slash-commands#registering-a-command
     def register_slash_command

app/logical/discord_slash_command/post_embed.rb

@@ -0,0 +1,67 @@
+class DiscordSlashCommand
+  class PostEmbed
+    attr_reader :post, :command
+
+    def initialize(post, command)
+      @post = post
+      @command = command
+    end
+
+    def to_h
+      {
+        title: post.dtext_shortlink,
+        url: Routes.url_for(post),
+        timestamp: post.created_at.iso8601,
+        color: embed_color,
+        footer: embed_footer,
+        image: {
+          width: post.image_width,
+          height: post.image_height,
+          url: embed_image,
+        },
+      }
+    end
+
+    def embed_image
+      if is_censored?
+        nil
+      elsif post.file_ext.match?(/jpe?g|png|gif/)
+        post.file_url
+      else
+        post.preview_file_url
+      end
+    end
+
+    def embed_color
+      if post.is_flagged?
+        0xC41C19
+      elsif post.is_pending?
+        0x0000FF
+      elsif post.parent_id.present?
+        0xC0C000
+      elsif post.has_active_children?
+        0x00FF00
+      elsif post.is_deleted?
+        0xFFFFFF
+      else
+        nil
+      end
+    end
+
+    def embed_footer
+      dimensions = "#{post.image_width}x#{post.image_height}"
+      file_size = post.file_size.to_s(:human_size, precision: 4)
+      text = "Rating: #{post.rating.upcase} | #{dimensions} (#{file_size} #{post.file_ext})"
+
+      { text: text }
+    end
+
+    def is_censored?
+      post.rating != "s" && !is_nsfw_channel?
+    end
+
+    def is_nsfw_channel?
+      command.channel.fetch("nsfw")
+    end
+  end
+end

app/logical/discord_slash_command/posts_command.rb

@@ -11,83 +11,26 @@ class DiscordSlashCommand
     end
 
     def options
-      [{
-        name: "tags",
-        description: "The tags to search",
-        required: true,
-        type: ApplicationCommandOptionType::String
-      }]
+      [
+        {
+          name: "tags",
+          description: "The tags to search",
+          type: ApplicationCommandOptionType::String
+        },
+        {
+          name: "limit",
+          description: "The number of posts to show (max 10)",
+          type: ApplicationCommandOptionType::Integer
+        }
+      ]
     end
 
     def call
       tags = params[:tags]
-      query = PostQueryBuilder.new(tags, User.anonymous).normalized_query
+      limit = params.fetch(:limit, 3).clamp(1, 10)
+      posts = Post.user_tag_match(tags, User.anonymous).limit(limit)
 
-      limit = query.find_metatag(:limit) || 3
-      limit = limit.to_i.clamp(1, 10)
-      posts = query.build.paginate(1, limit: limit)
-      embeds = posts.map { |post| post_embed(post) }
-
-      respond_with(embeds: embeds)
+      respond_with(posts: posts)
     end
-
-    def post_embed(post)
-      {
-        title: post.dtext_shortlink,
-        url: Routes.url_for(post),
-        timestamp: post.created_at.iso8601,
-        color: post_embed_color(post),
-        footer: post_embed_footer(post),
-        image: {
-          width: post.image_width,
-          height: post.image_height,
-          url: post_embed_image(post),
-        },
-      }
-    end
-
-    def post_embed_image(post, blur: 50)
-      if is_censored?(post)
-        nil
-      elsif post.file_ext.match?(/jpe?g|png|gif/)
-        post.file_url
-      else
-        post.preview_file_url
-      end
-    end
-
-    def post_embed_color(post)
-      if post.is_flagged?
-        0xC41C19
-      elsif post.is_pending?
-        0x0000FF
-      elsif post.parent_id.present?
-        0xC0C000
-      elsif post.has_active_children?
-        0x00FF00
-      elsif post.is_deleted?
-        0xFFFFFF
-      else
-        nil
-      end
-    end
-
-    def post_embed_footer(post)
-      dimensions = "#{post.image_width}x#{post.image_height}"
-      file_size = post.file_size.to_s(:human_size, precision: 4)
-      text = "Rating: #{post.rating.upcase} | #{dimensions} (#{file_size} #{post.file_ext})"
-
-      { text: text }
-    end
-
-    def is_censored?(post)
-      post.rating != "s" && !is_nsfw_channel?
-    end
-
-    def is_nsfw_channel?
-      discord.get_channel(data[:channel_id]).fetch("nsfw")
-    end
-
-    memoize :is_nsfw_channel?
   end
 end

app/logical/discord_slash_command/random_command.rb

@@ -0,0 +1,34 @@
+class DiscordSlashCommand
+  class RandomCommand < DiscordSlashCommand
+    def name
+      "random"
+    end
+
+    def description
+      "Show a random post"
+    end
+
+    def options
+      [
+        {
+          name: "tags",
+          description: "The tags to search",
+          type: ApplicationCommandOptionType::String
+        },
+        {
+          name: "limit",
+          description: "The number of posts to show (max 10)",
+          type: ApplicationCommandOptionType::Integer
+        }
+      ]
+    end
+
+    def call
+      tags = params[:tags]
+      limit = params.fetch(:limit, 1).clamp(1, 10)
+      posts = Post.user_tag_match(tags, User.anonymous).random(limit)
+
+      respond_with(posts: posts)
+    end
+  end
+end

app/logical/post_sets/post.rb

@@ -103,9 +103,7 @@ module PostSets
     end
 
     def get_random_posts
-      per_page.times.inject([]) do |all, _|
-        all << ::Post.user_tag_match(tag_string).random
-      end.compact.uniq
+      ::Post.user_tag_match(tag_string).random(per_page)
     end
 
     def posts

app/models/post.rb

@@ -1144,10 +1144,11 @@ class Post < ApplicationRecord
   end
 
   module SearchMethods
-    # returns one single post
-    def random
-      key = Digest::MD5.hexdigest(Time.now.to_f.to_s)
-      random_up(key) || random_down(key)
+    def random(n = 1)
+      n.times.map do
+        key = SecureRandom.hex(16)
+        random_up(key) || random_down(key)
+      end.compact.uniq
     end
 
     def random_up(key)