#3

backend/app/controllers/thread_posts_controller.rb

@@ -24,7 +24,12 @@ class ThreadPostsController < ApplicationController
   def create
     post = @thread.posts.new(post_params)
     if post.save
-      render json: post, status: :created
+      render json: post.as_json.merge(image_url: (
+          if post.image.attached?
+            Rails.application.routes.url_helpers.rails_blob_url(post.image, only_path: true)
+          else
+            nil
+          end)), status: :created
     else
       render json: { errors: post.errors.full_messages }, status: :unprocessable_entity
     end
@@ -37,6 +42,8 @@ class ThreadPostsController < ApplicationController
   end
 
   def post_params
-    params.require(:post).permit(:name, :body, :password)
+    params.permit(:name, :message, :password, :image).transform_values { |v|
+      v.presence
+    }
   end
 end

backend/app/models/post.rb

@@ -2,7 +2,16 @@ class Post < ApplicationRecord
   belongs_to :thread, class_name: 'Topic', foreign_key: :thread_id
   has_one_attached :image
 
+  before_create :set_post_no
+
   has_secure_password validations: false
 
   scope :active, -> { where deleted_at: nil }
+
+  private
+
+  def set_post_no
+    max_no = Post.where(thread_id:).maximum(:post_no) || 0
+    self.post_no = max_no + 1
+  end
 end

frontend/src/components/threads/ThreadCanvas.tsx

@@ -1,9 +1,14 @@
+import cn from 'classnames'
+import Konva from 'konva'
 import { nanoid } from 'nanoid'
-import { useEffect, useRef, useState } from 'react'
+import { forwardRef,
+	 useEffect,
+	 useImperativeHandle,
+	 useRef,
+	 useState } from 'react'
 import { FaRedo, FaUndo } from 'react-icons/fa'
 import { Layer, Line, Rect, Stage, Image } from 'react-konva'
 
-import type Konva from 'konva'
 import type { ChangeEventHandler } from 'react'
 
 type ImageItem = { src: string }
@@ -113,7 +118,16 @@ const isLayer = (obj: unknown): obj is Layer => (
     && Array.isArray ((obj as Layer).future))
 
 
-export default () => {
+export type ThreadCanvasHandle = {
+    exportAll:  () => Promise<{ dataURL:  string
+			        width:    number
+			        height:   number }>
+    clear:      () => void }
+
+type Props = { visible: boolean }
+
+
+export default forwardRef<ThreadCanvasHandle, Props> (({ visible }, ref) => {
   const drawingRef = useRef (false)
   const fileInputRef = useRef<HTMLInputElement> (null)
   const layersRef = useRef<Record<string, Konva.Layer>> ({ })
@@ -321,6 +335,69 @@ export default () => {
     setStageHeight (480)
   }
 
+  const exportAllLayers = async (): Promise<string> => {
+    const container = document.createElement ('div')
+    const stage = new Konva.Stage ({
+	container,
+	width:      stageWidth,
+	height:     stageHeight })
+
+    const bgLayer = new Konva.Layer
+    bgLayer.add (new Konva.Rect ({
+	x:          0,
+	y:          0,
+	width:      stageWidth,
+	height:     stageHeight,
+	fill:       'white',
+	listening:  false }))
+    stage.add (bgLayer)
+
+    layers.forEach (layer => {
+      const kLayer = new Konva.Layer
+
+      const baseImg = images[layer.id]
+      if (baseImg)
+	{
+	  kLayer.add (new Konva.Image ({
+	      image:      baseImg,
+	      x:          0,
+	      y:          0,
+	      scaleX:     stageWidth / baseImg.width,
+	      scaleY:     stageHeight / baseImg.height,
+	      listening:  false }))
+	}
+
+      layer.lines.forEach (line => {
+	if (line.mode === Mode.Paint)
+	  {
+	    const img = images[line.imageSrc]
+	    img && kLayer.add (new Konva.Image ({
+		image:      img,
+		x:          0,
+		y:          0,
+		listening:  false }))
+	  }
+	else
+	  {
+	    kLayer.add (new Konva.Line ({
+		points:                   line.points,
+		stroke:                   line.mode === Mode.Rubber ? 'black' : line.stroke,
+		strokeWidth:              line.strokeWidth,
+		tension:                  .5,
+		lineCap:                  'round',
+		globalCompositeOperation: line.mode === Mode.Rubber ? 'destination-out' : 'source-over',
+		listening:                false }))
+	  }
+      })
+
+      stage.add (kLayer)
+    })
+
+    const dataURL = stage.toDataURL ({ mimeType: 'image/png', pixelRatio: 1 })
+    stage.destroy ()
+    return dataURL
+  }
+
   useEffect (() => {
     try
     {
@@ -374,8 +451,14 @@ export default () => {
     })
   }, [layers])
 
+  useImperativeHandle (ref, () => ({
+      exportAll:  async () => ({ dataURL: await exportAllLayers (),
+				 width:   stageWidth,
+				 height:  stageHeight }),
+      clear:	  clearCanvas }))
+
   return (
-      <div>
+      <div className={cn (!(visible) && 'hidden')}>
 	<div>
 	  <div>
 	    <button onClick={() => {
@@ -544,7 +627,7 @@ export default () => {
 	  </label>
 	</div>
 
-	<div className="w-full flex items-center justify-center mb-16">
+	<div className="w-full flex items-center justify-center">
 	  <div className="border border-black dark:border-white">
 	    <Stage className="touch-none"
 		   ref={node => {
@@ -609,4 +692,4 @@ export default () => {
 	  </div>
 	</div>
       </div>)
-}
+})

frontend/src/pages/threads/ThreadDetailPage.tsx

@@ -1,23 +1,111 @@
 import axios from 'axios'
 import toCamel from 'camelcase-keys'
-import { useEffect, useState } from 'react'
+import { useEffect, useRef, useState } from 'react'
 import { FaThumbsDown, FaThumbsUp } from 'react-icons/fa'
-import { useParams } from 'react-router-dom'
+import { useParams, useSearchParams } from 'react-router-dom'
 
 import ThreadCanvas from '@/components/threads/ThreadCanvas'
 import { API_BASE_URL } from '@/config'
 
+import type { ThreadCanvasHandle } from '@/components/threads/ThreadCanvas'
 import type { Post, Thread } from '@/types'
 
+const Sort = {
+    Newest:   'newest',
+    Oldest:   'oldest',
+    Likes:    'likes',
+    Dislikes: 'dislikes' } as const
+type Sort = (typeof Sort)[keyof typeof Sort]
+
+
+const reformPost = (post: Post): Post => ({
+    ...post,
+    createdAt:  (new Date (post.createdAt)).toLocaleString ('ja-JP-u-ca-japanese') })
+
 
 export default () => {
   const { id } = useParams ()
 
+  const canvasRef = useRef<ThreadCanvasHandle> (null)
+
+  const [searchParams, setSearchParams] = useSearchParams ()
+  const sort = searchParams.get ('sort') ?? 'created_at'
+  const order = searchParams.get ('order') ?? 'desc'
+  const sortKey = (() => {
+    if (sort === 'score')
+      {
+	if (order === 'asc')
+	  return Sort.Dislikes
+	return Sort.Likes
+      }
+    else
+      {
+	if (order === 'asc')
+	  return Sort.Oldest
+	return Sort.Newest
+      }
+  }) ()
+
   const [loading, setLoading] = useState (true)
+  const [message, setMessage] = useState ('')
+  const [name, setName] = useState ('')
+  const [password, setPassword] = useState ('')
   const [posts, setPosts] = useState<Post[]> ([])
+  const [sending, setSending] = useState (false)
   const [thread, setThread] = useState<Thread | null> (null)
+  const [withImage, setWithImage] = useState (false)
+
+  const handleSend = async () => {
+    if (!(message) && !(withImage))
+      {
+	alert ('メッセージ書くか画像描くかどっちかはしろ．')
+	return
+      }
+
+    setSending (true)
+    try
+    {
+      const form = new FormData
+      if (withImage)
+	{
+	  if (!(canvasRef.current))
+	    return
+	  const { dataURL } = await canvasRef.current.exportAll ()
+	  const blob = await (await fetch (dataURL)).blob ()
+	  form.append ('image', new File ([blob], `kekec_${ Date.now () }.png`, { type: 'image/png' }))
+	}
+      form.append ('name', name)
+      form.append ('message', message)
+      form.append ('password', password)
+      const res = await axios.post (`${ API_BASE_URL }/threads/${ id }/posts`,
+				    form,
+				    { headers: { 'Content-Type': 'multipart/form-data' } })
+      const data: Post = toCamel (res.data as any, { deep: true })
+      setPosts(prev => [reformPost (data), ...prev])
+
+      setMessage ('')
+      if (withImage)
+	{
+	  canvasRef.current!.clear ()
+	  setWithImage (false)
+	}
+
+      localStorage.setItem ('name', name)
+      localStorage.setItem ('password', password)
+    }
+    finally
+    {
+      setSending (false)
+    }
+  }
 
   useEffect (() => {
+    const nameRaw = localStorage.getItem ('name')
+    nameRaw && setName (nameRaw)
+
+    const passRaw = localStorage.getItem ('password')
+    passRaw && setName (passRaw)
+
     const fetchThread = async () => {
       try
       {
@@ -29,16 +117,17 @@ export default () => {
 	setThread (null)
       }
     }
+    fetchThread ()
+  }, [])
 
+  useEffect (() => {
     const fetchPosts = async () => {
-      setLoading (true)
       try
       {
-	const res = await axios.get (`${ API_BASE_URL }/threads/${ id }/posts`)
+	const res = await axios.get (`${ API_BASE_URL }/threads/${ id }/posts`,
+				     { params: { sort, order } })
 	const data = toCamel (res.data as any, { deep: true }) as Post[]
-	setPosts (data.map (p => ({
+	setPosts (data.map (reformPost))
-	    ...p,
-	    createdAt:  (new Date (p.createdAt)).toLocaleString ('ja-JP-u-ca-japanese') })))
       }
       catch
       {
@@ -46,10 +135,8 @@ export default () => {
       }
       setLoading (false)
     }
-
-    fetchThread ()
     fetchPosts ()
-  }, [])
+  }, [sortKey])
 
   useEffect (() => {
     if (!(thread))
@@ -59,11 +146,78 @@ export default () => {
 
   return (
       <>
-	<ThreadCanvas />
+	<div className="mb-16">
+	  <div>
+	    <label>名前：</label>
+	    <input type="text"
+		   value={name}
+		   onChange={ev => setName (ev.target.value)} />
+	  </div>
+	  <div>
+	    <label>削除用パスワード：</label>
+	    <input type="password"
+		   value={password}
+		   onChange={ev => setPassword (ev.target.value)} />
+	  </div>
+	  <div>
+	    <label>メッセージ：</label>
+	    <textarea value={message}
+		      onChange={ev => setMessage (ev.target.value)} />
+	  </div>
+	  <div>
+	    <label>
+	      <input type="checkbox"
+		     checked={withImage}
+		     onChange={ev => setWithImage (ev.target.checked)} />
+	      イラストを投稿に含める
+	    </label>
+	  </div>
+	  <ThreadCanvas ref={canvasRef} visible={withImage} />
+	  <div>
+	    <button onClick={handleSend} disabled={sending}>
+	      {sending ? '送信中...' : '送信'}
+	    </button>
+	  </div>
+	</div>
 	{loading ? 'Loading...' : (
 	    posts.length > 0
-	    ? posts.map (post => (
+	    ? (
+		<>
+		  <div>
+		    <label>
+		      並べ替え：
+		    <select value={sortKey} onChange={ev => {
+		      switch (ev.target.value)
+		      {
+		      case Sort.Newest:
+			searchParams.set ('sort', 'created_at')
+			searchParams.set ('order', 'desc')
+			break
+		      case Sort.Likes:
+			searchParams.set ('sort', 'score')
+			searchParams.set ('order', 'desc')
+			break
+		      case Sort.Dislikes:
+			searchParams.set ('sort', 'score')
+			searchParams.set ('order', 'asc')
+			break
+		      case Sort.Oldest:
+			searchParams.set ('sort', 'created_at')
+			searchParams.set ('order', 'asc')
+			break
+		      }
+		      setSearchParams (searchParams)
+		    }}>
+		      <option value={Sort.Newest}>投稿が新しい順</option>
+		      <option value={Sort.Likes}>評価が高い順</option>
+		      <option value={Sort.Dislikes}>評価が低い順</option>
+		      <option value={Sort.Oldest}>投稿が古い順</option>
+		    </select>
+		  </label>
+		</div>
+		  {posts.map (post => (
 		      <div key={post.id}
+			   id={post.postNo.toString ()}
 			   className="bg-white dark:bg-gray-800 p-3 m-4
 				      border border-gray-400 rounded-xl
 				      text-center">
@@ -119,10 +273,21 @@ export default () => {
 			    {post.good} <FaThumbsUp className="inline" />
 			  </a>
 			</div>
+			{post.deletedAt
+			 ? <em className="font-bold">削除されました．</em>
+			 : (
+			    <>
+			      {post.message && (
+				  <div className="text-left px-4 my-2">
+				    {post.message}
+				  </div>)}
+			      {post.imageUrl && (
 				  <div className="bg-white inline-block border border-black dark:border-white">
 				    <img src={`${ API_BASE_URL }${ post.imageUrl }`} />
-		  </div>
+				  </div>)}
-		</div>))
+			    </>)}
+		      </div>))}
+		</>)
 	    : 'レスないよ（笑）．')}
       </>)
 }