#99

backend/app/controllers/materials_controller.rb

@@ -22,24 +22,35 @@ class MaterialsController < ApplicationController
   end
 
   def show
-    material = Material.includes(:tag, :created_by_user).with_attached_file.find_by(id: params[:id])
+    material =
+        Material
+        .includes(:tag)
+        .with_attached_file
+        .find_by(id: params[:id])
     return head :not_found unless material
 
-    render json: material_json(material)
+    render json: material.as_json(methods: [:content_type]).merge(
+        file: if material.file.attached?
+                rails_storage_proxy_url(material.file, only_path: false)
+              end,
+        tag: TagRepr.base(material.tag))
   end
 
   def create
     return head :unauthorized unless current_user
-    return head :forbidden unless current_user.gte_member?
 
+    tag_name_raw = params[:tag].to_s.strip
     file = params[:file]
-    return head :bad_request if file.blank?
+    url = params[:url].to_s.strip.presence
+    return head :bad_request if tag_name_raw.blank? || (file.blank? && url.blank?)
 
-    material = Material.new(
+    tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
-        url: params[:url].presence,
+    tag = tag_name.tag
-        parent_id: params[:parent_id].presence,
+    tag = Tag.create!(tag_name:, category: :material) unless tag
-        tag_id: params[:tag_id].presence,
+
-        created_by_user: current_user)
+    material = Material.new(tag:, url:,
+                            created_by_user: current_user,
+                            updated_by_user: current_user)
     material.file.attach(file)
 
     if material.save
@@ -56,15 +67,28 @@ class MaterialsController < ApplicationController
     material = Material.with_attached_file.find_by(id: params[:id])
     return head :not_found unless material
 
-    material.assign_attributes(
+    tag_name_raw = params[:tag].to_s.strip
-      url: params[:url].presence,
+    file = params[:file]
-      parent_id: params[:parent_id].presence,
+    url = params[:url].to_s.strip.presence
-      tag_id: params[:tag_id].presence
+    return head :bad_request if tag_name_raw.blank? || (file.blank? && url.blank?)
-    )
+
-    material.file.attach(params[:file]) if params[:file].present?
+    tag_name = TagName.find_undiscard_or_create_by!(name: tag_name_raw)
+    tag = tag_name.tag
+    tag = Tag.create!(tag_name:, category: :material) unless tag
+
+    material.update!(tag:, url:, updated_by_user: current_user)
+    if file
+      material.file.attach(file)
+    else
+      material.file.purge(file)
+    end
 
     if material.save
-      render json: material_json(material)
+      render json: material.as_json(methods: [:content_type]).merge(
+          file: if material.file.attached?
+                  rails_storage_proxy_url(material.file, only_path: false)
+                end,
+          tag: TagRepr.base(material.tag))
     else
       render json: { errors: material.errors.full_messages }, status: :unprocessable_entity
     end

backend/app/controllers/tags_controller.rb

@@ -107,18 +107,6 @@ class TagsController < ApplicationController
     }
   end
 
-  def materials_by_name
-    name = params[:name].to_s.strip
-    return head :bad_request if name.blank?
-
-    tag = Tag.joins(:tag_name)
-             .includes(:tag_name, tag_name: :wiki_page)
-             .find_by(tag_names: { name: })
-    return :not_found unless tag
-
-    render json: build_tag_children(tag)
-  end
-
   def autocomplete
     q = params[:q].to_s.strip.sub(/\Anot:/i, '')
 
@@ -209,6 +197,18 @@ class TagsController < ApplicationController
     render json: DeerjikistRepr.many(tag.deerjikists)
   end
 
+  def materials_by_name
+    name = params[:name].to_s.strip
+    return head :bad_request if name.blank?
+
+    tag = Tag.joins(:tag_name)
+             .includes(:tag_name, tag_name: :wiki_page)
+             .find_by(tag_names: { name: })
+    return :not_found unless tag
+
+    render json: build_tag_children(tag)
+  end
+
   def update
     return head :unauthorized unless current_user
     return head :forbidden unless current_user.gte_member?
@@ -231,7 +231,17 @@ class TagsController < ApplicationController
 
   private
 
-  def build_tag_children tag
+  def build_tag_children(tag)
-    TagRepr.base(tag).merge(children: tag.children.map { build_tag_children(_1) })
+    material = tag.materials.first
+    file = nil
+    content_type = nil
+    if material&.file&.attached?
+      file = rails_storage_proxy_url(material.file, only_path: false)
+      content_type = material.file.blob.content_type
+    end
+
+    TagRepr.base(tag).merge(
+        children: tag.children.sort_by { _1.name }.map { build_tag_children(_1) },
+        material: material.as_json&.merge(file:, content_type:))
   end
 end

backend/app/models/material.rb

@@ -12,9 +12,17 @@ class Material < ApplicationRecord
 
   has_one_attached :file, dependent: :purge
 
+  validates :tag_id, presence: true, uniqueness: true
+
   validate :file_must_be_attached
   validate :tag_must_be_material_category
 
+  def content_type
+    return nil unless file&.attached?
+
+    file.blob.content_type
+  end
+
   private
 
   def file_must_be_attached
@@ -24,7 +32,7 @@ class Material < ApplicationRecord
   end
 
   def tag_must_be_material_category
-    return if tag.blank? || tag.material?
+    return if tag.blank? || tag.character? || tag.material?
 
     errors.add(:tag, '素材カテゴリのタグを指定してください．')
   end

backend/app/models/tag.rb

@@ -31,6 +31,7 @@ class Tag < ApplicationRecord
            class_name: 'TagSimilarity', foreign_key: :target_tag_id, dependent: :delete_all
 
   has_many :deerjikists, dependent: :delete_all
+  has_many :materials
 
   belongs_to :tag_name
   delegate :wiki_page, to: :tag_name

frontend/src/App.tsx

@@ -10,9 +10,11 @@ import RouteBlockerOverlay from '@/components/RouteBlockerOverlay'
 import TopNav from '@/components/TopNav'
 import { Toaster } from '@/components/ui/toaster'
 import { apiPost, isApiError } from '@/lib/api'
-// import MaterialDetailPage from '@/pages/materials/MaterialDetailPage'
+import MaterialBasePage from '@/pages/materials/MaterialBasePage'
+import MaterialDetailPage from '@/pages/materials/MaterialDetailPage'
 import MaterialListPage from '@/pages/materials/MaterialListPage'
-import MaterialSearchPage from '@/pages/materials/MaterialSearchPage'
+import MaterialNewPage from '@/pages/materials/MaterialNewPage'
+// import MaterialSearchPage from '@/pages/materials/MaterialSearchPage'
 import NicoTagListPage from '@/pages/tags/NicoTagListPage'
 import NotFound from '@/pages/NotFound'
 import PostDetailPage from '@/pages/posts/PostDetailPage'
@@ -44,7 +46,7 @@ const RouteTransitionWrapper = ({ user, setUser }: {
   return (
       <LayoutGroup id="gallery-shared">
 	<AnimatePresence mode="wait">
-	  <Routes location={location} key={location.pathname}>
+	  <Routes location={location}>
 	    <Route path="/" element={<Navigate to="/posts" replace/>}/>
 	    <Route path="/posts" element={<PostListPage/>}/>
 	    <Route path="/posts/new" element={<PostNewPage user={user}/>}/>
@@ -54,9 +56,12 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	    <Route path="/tags" element={<TagListPage/>}/>
 	    <Route path="/tags/nico" element={<NicoTagListPage user={user}/>}/>
 	    <Route path="/theatres/:id" element={<TheatreDetailPage/>}/>
-	    <Route path="/materials" element={<MaterialListPage/>}/>
+	    <Route path="/materials" element={<MaterialBasePage/>}>
-	    <Route path="/materials/search" element={<MaterialSearchPage/>}/>
+	      <Route index element={<MaterialListPage/>}/>
-	    {/* <Route path="/materials/:tagName" element ={<MaterialDetailPage/>}/> */}
+	      <Route path="new" element={<MaterialNewPage/>}/>
+	      <Route path=":id" element ={<MaterialDetailPage/>}/>
+	    </Route>
+	    {/* <Route path="/materials/search" element={<MaterialSearchPage/>}/> */}
 	    <Route path="/wiki" element={<WikiSearchPage/>}/>
 	    <Route path="/wiki/:title" element={<WikiDetailPage/>}/>
 	    <Route path="/wiki/new" element={<WikiNewPage user={user}/>}/>

frontend/src/components/MaterialSidebar.tsx

@@ -25,7 +25,9 @@ const setChildrenById = (
       if (tag.children.length === 0)
 	return tag
 
-      return { ...tag, children: setChildrenById (tag.children, targetId, children) }
+      return { ...tag,
+	       children: (setChildrenById (tag.children, targetId, children)
+			  .filter (t => t.category !== 'meme' || t.hasChildren)) }
     }))
 
 
@@ -36,7 +38,8 @@ export default (() => {
 
   useEffect (() => {
     void (async () => {
-      setTags (await apiGet<TagWithDepth[]> ('/tags/with-depth'))
+      setTags ((await apiGet<TagWithDepth[]> ('/tags/with-depth'))
+	       .filter (t => t.category !== 'meme' || t.hasChildren))
     }) ()
   }, [])
 
@@ -87,10 +90,8 @@ export default (() => {
 
   return (
       <SidebarComponent>
-	<div className="md:h-[calc(100dvh-120px)] md:overflow-y-auto">
 	<ul>
 	  {renderTags (tags)}
 	</ul>
-	</div>
       </SidebarComponent>)
 }) satisfies FC

frontend/src/components/TopNav.tsx

@@ -79,11 +79,11 @@ export default (({ user }: Props) => {
 	  { name: '上位タグ', to: '/tags/implications', visible: false },
 	  { name: 'ニコニコ連携', to: '/tags/nico' },
 	  { name: 'ヘルプ', to: '/wiki/ヘルプ:タグ' }] },
-      { name: '素材集', to: '/materials', subMenu: [
+      { name: '素材', to: '/materials', subMenu: [
 	  { name: '一覧', to: '/materials' },
-	  { name: '検索', to: '/materials/search' },
+	  // { name: '検索', to: '/materials/search' }, 
 	  { name: '追加', to: '/materials/new' },
-	  { name: '履歴', to: '/materials/changes' },
+	  // { name: '履歴', to: '/materials/changes' },
 	  { name: 'ヘルプ', to: 'wiki/ヘルプ:素材集' }] },
       { name: '上映会', to: '/theatres/1', base: '/theatres', subMenu: [
           { name: <>第&thinsp;1&thinsp;会場</>, to: '/theatres/1' },

frontend/src/components/layout/MainArea.tsx

@@ -8,6 +8,8 @@ type Props = {
 
 
 export default (({ children, className }: Props) => (
-    <main className={cn ('flex-1 overflow-y-auto p-4', className)}>
+    <main className={cn ('flex-1 overflow-y-auto p-4',
+			 'md:h-[calc(100dvh-88px)] md:overflow-y-auto',
+			 className)}>
       {children}
     </main>)) satisfies FC<Props>

frontend/src/components/layout/SidebarComponent.tsx

@@ -1,9 +1,29 @@
-import React from 'react'
+import { Helmet } from 'react-helmet-async'
 
-type Props = { children: React.ReactNode }
+import type { FC, ReactNode } from 'react'
+
+type Props = { children: ReactNode }
 
 
-export default ({ children }: Props) => (
+export default (({ children }: Props) => (
-    <div className="p-4 w-full md:w-64 md:h-full">
+    <div
+	className="p-4 w-full md:w-64 md:h-full
+		   md:h-[calc(100dvh-88px)] md:overflow-y-auto
+		   sidebar">
+      <Helmet>
+	<style>
+	  {`
+	      .sidebar
+	      {
+		direction: rtl;
+	      }
+
+	      .sidebar > *
+	      {
+		direction: ltr;
+	      }`}
+	</style>
+      </Helmet>
+
       {children}
-    </div>)
+    </div>)) satisfies FC<Props>

frontend/src/pages/materials/MaterialBasePage.tsx

@@ -0,0 +1,12 @@
+import { Outlet } from 'react-router-dom'
+
+import MaterialSidebar from '@/components/MaterialSidebar'
+
+import type { FC } from 'react'
+
+
+export default (() => (
+    <div className="md:flex md:flex-1">
+      <MaterialSidebar/>
+      <Outlet/>
+    </div>)) satisfies FC

frontend/src/pages/materials/MaterialDetailPage.tsx

@@ -0,0 +1,175 @@
+import { useEffect, useState } from 'react'
+import { Helmet } from 'react-helmet-async'
+import { useParams } from 'react-router-dom'
+
+import TagLink from '@/components/TagLink'
+import Label from '@/components/common/Label'
+import PageTitle from '@/components/common/PageTitle'
+import TabGroup, { Tab } from '@/components/common/TabGroup'
+import TagInput from '@/components/common/TagInput'
+import MainArea from '@/components/layout/MainArea'
+import { Button } from '@/components/ui/button'
+import { toast } from '@/components/ui/use-toast'
+import { SITE_TITLE } from '@/config'
+import { apiGet, apiPut } from '@/lib/api'
+
+import type { FC } from 'react'
+
+import type { Material, Tag } from '@/types'
+
+type MaterialWithTag = Material & { tag: Tag }
+
+
+export default (() => {
+  const { id } = useParams ()
+
+  const [file, setFile] = useState<File | null> (null)
+  const [filePreview, setFilePreview] = useState ('')
+  const [loading, setLoading] = useState (false)
+  const [material, setMaterial] = useState<MaterialWithTag | null> (null)
+  const [sending, setSending] = useState (false)
+  const [tag, setTag] = useState ('')
+  const [url, setURL] = useState ('')
+
+  const handleSubmit = async () => {
+    const formData = new FormData
+    if (tag.trim ())
+      formData.append ('tag', tag)
+    if (file)
+      formData.append ('file', file)
+    if (url.trim ())
+      formData.append ('url', url)
+
+    try
+    {
+      setSending (true)
+      const data = await apiPut<Material> (`/materials/${ id }`, formData)
+      setMaterial (data)
+      toast ({ title: '更新成功!' })
+    }
+    catch
+    {
+      toast ({ title: '更新失敗……', description: '入力を見直してください．' })
+    }
+    finally
+    {
+      setSending (false)
+    }
+  }
+
+  useEffect (() => {
+    if (!(id))
+      return
+
+    void (async () => {
+      try
+      {
+	setLoading (true)
+	const data = await apiGet<MaterialWithTag> (`/materials/${ id }`)
+	setMaterial (data)
+	setTag (data.tag.name)
+	if (data.file && data.contentType)
+	  {
+	    setFilePreview (data.file)
+	    setFile (new File ([await (await fetch (data.file)).blob ()],
+			       data.file,
+			       { type: data.contentType }))
+	  }
+	setURL (data.url ?? '')
+      }
+      finally
+      {
+	setLoading (false)
+      }
+    }) ()
+  }, [id])
+
+  return (
+      <MainArea>
+	{material && (
+	    <Helmet>
+	      <title>{`${ material.tag.name } 素材照会 | ${ SITE_TITLE }`}</title>
+	    </Helmet>)}
+
+	{loading ? 'Loading...' : (material && (
+	    <>
+	      <PageTitle>
+		<TagLink
+		    tag={material.tag}
+		    withWiki={false}
+		    withCount={false}/>
+	      </PageTitle>
+
+	      {(material.file && material.contentType) && (
+		  (/image\/.*/.test (material.contentType) && (
+		      <img src={material.file} alt={material.tag.name || undefined}/>))
+		  || (/video\/.*/.test (material.contentType) && (
+		      <video src={material.file} controls/>))
+		  || (/audio\/.*/.test (material.contentType) && (
+		      <audio src={material.file} controls/>)))}
+
+	      <TabGroup>
+		<Tab name="編輯">
+		  <div className="max-w-wl pt-2 space-y-4">
+		    {/* タグ */}
+		    <div>
+		      <Label>タグ</Label>
+		      <TagInput value={tag} setValue={setTag}/>
+		    </div>
+
+		    {/* ファイル */}
+		    <div>
+		      <Label>ファイル</Label>
+		      <input
+			  type="file"
+			  accept="image/*,video/*,audio/*"
+			  onChange={e => {
+			    const f = e.target.files?.[0]
+			    setFile (f ?? null)
+			    setFilePreview (f ? URL.createObjectURL (f) : '')
+			  }}/>
+		      {(file && filePreview) && (
+			  (/image\/.*/.test (file.type) && (
+			      <img
+				  src={filePreview}
+				  alt="preview"
+				  className="mt-2 max-h-48 rounded border"/>))
+			  || (/video\/.*/.test (file.type) && (
+			      <video
+				  src={filePreview}
+				  controls
+				  className="mt-2 max-h-48 rounded border"/>))
+			  || (/audio\/.*/.test (file.type) && (
+			      <audio
+				  src={filePreview}
+				  controls
+				  className="mt-2 max-h-48"/>))
+			  || (
+			      <p className="text-red-600 dark:text-red-400">
+				その形式のファイルには対応していません．
+			      </p>))}
+		    </div>
+
+		    {/* 参考 URL */}
+		    <div>
+		      <Label>参考 URL</Label>
+		      <input
+			  type="url"
+			  value={url}
+			  onChange={e => setURL (e.target.value)}
+			  className="w-full border p-2 rounded"/>
+		    </div>
+
+		    {/* 送信 */}
+		    <Button
+			onClick={handleSubmit}
+			className="px-4 py-2 bg-blue-600 text-white rounded disabled:bg-gray-400"
+			disabled={sending}>
+		      更新
+		    </Button>
+		  </div>
+		</Tab>
+	      </TabGroup>
+	    </>))}
+      </MainArea>)
+}) satisfies FC

frontend/src/pages/materials/MaterialListPage.tsx

@@ -1,8 +1,10 @@
 import { Fragment, useEffect, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
-import { Link, useLocation } from 'react-router-dom'
+import { useLocation } from 'react-router-dom'
 
-import MaterialSidebar from '@/components/MaterialSidebar'
+import nikumaru from '@/assets/fonts/nikumaru.otf'
+import PrefetchLink from '@/components/PrefetchLink'
+import TagLink from '@/components/TagLink'
 import PageTitle from '@/components/common/PageTitle'
 import SectionTitle from '@/components/common/SectionTitle'
 import SubsectionTitle from '@/components/common/SubsectionTitle'
@@ -12,15 +14,35 @@ import { apiGet } from '@/lib/api'
 
 import type { FC } from 'react'
 
-import type { Tag } from '@/types'
+import type { Material, Tag } from '@/types'
 
 type TagWithMaterial = Omit<Tag, 'children'> & {
     children: TagWithMaterial[]
-    material: any | null }
+    material: Material | null }
 
 
+const MaterialCard = ({ tag }: { tag: TagWithMaterial }) => {
+  if (!(tag.material))
+    return
+
+  return (
+      <PrefetchLink
+	  to={`/materials/${ tag.material.id }/edit`}
+	  className="block w-40 h-40">
+	<div
+	    className="w-full h-full overflow-hidden rounded-xl shadow
+		       text-center content-center text-4xl"
+	    style={{ fontFamily: 'Nikumaru' }}>
+	  {(tag.material.contentType && /image\/.*/.test (tag.material.contentType))
+	   ? <img src={tag.material.file || undefined}/>
+	   : <span>照会</span>}
+	</div>
+      </PrefetchLink>)
+}
+
 
 export default (() => {
+  const [loading, setLoading] = useState (false)
   const [tag, setTag] = useState<TagWithMaterial | null> (null)
 
   const location = useLocation ()
@@ -28,41 +50,117 @@ export default (() => {
   const tagQuery = query.get ('tag') ?? ''
 
   useEffect (() => {
+    if (!(tagQuery))
+      {
+	setTag (null)
+	return
+      }
+
     void (async () => {
+      try
+      {
+	setLoading (true)
 	setTag (
-	  await apiGet<TagWithMaterial> (`/tags/name/${ encodeURIComponent (tagQuery) }/materials`))
+	    await apiGet<TagWithMaterial> (
+		`/tags/name/${ encodeURIComponent (tagQuery) }/materials`))
+      }
+      finally
+      {
+	setLoading (false)
+      }
     }) ()
   }, [location.search])
 
   return (
-      <div className="md:flex md:flex-1">
+      <MainArea>
 	<Helmet>
+	  <style>
+	    {`
+		@font-face
+		{
+		  font-family: 'Nikumaru';
+		  src: url(${ nikumaru }) format('opentype');
+		}`}
+	  </style>
 	  <title>{`${ tag ? `${ tag.name } 素材集` : '素材集' } | ${ SITE_TITLE }`}</title>
 	</Helmet>
 
-	<MaterialSidebar/>
+	{loading ? 'Loading...' : (
-
+	    tag
-	<MainArea>
-	  {tag
 	    ? (
 		<>
-		<PageTitle>{tag.name}</PageTitle>
+		  <PageTitle>
+		    <TagLink
+			tag={tag}
+			withWiki={false}
+			withCount={false}
+			to={tag.material
+			    ? `/materials/${ tag.material.id }/edit`
+			    : `/materials?tag=${ encodeURIComponent (tag.name) }`}/>
+		  </PageTitle>
+		  {(!(tag.material) && tag.category !== 'meme') && (
+		      <div className="-mt-2">
+			<PrefetchLink
+			    to={`/materials/new?tag=${ encodeURIComponent (tag.name) }`}>
+			  追加
+			</PrefetchLink>
+		      </div>)}
+
+		  <MaterialCard tag={tag}/>
+
+		  <div className="ml-2">
 		    {tag.children.map (c2 => (
 			<Fragment key={c2.id}>
-		      <SectionTitle>{c2.name}</SectionTitle>
+			  <SectionTitle>
+			    <TagLink
+				tag={c2}
+				withWiki={false}
+				withCount={false}
+				to={`/materials?tag=${ encodeURIComponent (c2.name) }`}/>
+			  </SectionTitle>
+			  {(!(c2.material) && c2.category !== 'meme') && (
+			      <div className="-mt-4">
+				<PrefetchLink
+				    to={`/materials/new?tag=${ encodeURIComponent (c2.name) }`}>
+				  追加
+				</PrefetchLink>
+			      </div>)}
+
+			  <MaterialCard tag={c2}/>
+
+			  <div className="ml-2">
 			    {c2.children.map (c3 => (
-			  <SubsectionTitle key={c3.id}>{c3.name}</SubsectionTitle>))}
+				<Fragment key={c3.id}>
+				  <SubsectionTitle>
+				    <TagLink
+					tag={c3}
+					withWiki={false}
+					withCount={false}
+					to={`/materials?tag=${ encodeURIComponent (c3.name) }`}/>
+				  </SubsectionTitle>
+				  {(!(c3.material) && c3.category !== 'meme') && (
+				      <div className="-mt-2">
+					<PrefetchLink
+					    to={`/materials/new?tag=${
+						encodeURIComponent (c3.name) }`}>
+					  追加
+					</PrefetchLink>
+				      </div>)}
+
+				  <MaterialCard tag={c3}/>
 				</Fragment>))}
+			  </div>
+			</Fragment>))}
+		  </div>
 		</>)
 	    : (
 		<>
 		  <p>左のリストから照会したいタグを選択してください。</p>
 		  <p>もしくは……</p>
 		  <ul>
-		  <li><Link to="/materials/new">素材を新規追加する</Link></li>
+		    <li><PrefetchLink to="/materials/new">素材を新規追加する</PrefetchLink></li>
-		  <li><a href="#">すべての素材をダウンロードする</a></li>
+		    {/* <li><a href="#">すべての素材をダウンロードする</a></li> */}
 		  </ul>
-	      </>)}
+		</>))}
-	</MainArea>
+      </MainArea>)
-      </div>)
 }) satisfies FC

frontend/src/pages/materials/MaterialNewPage.tsx

@@ -0,0 +1,124 @@
+import { useState } from 'react'
+import { Helmet } from 'react-helmet-async'
+import { useLocation, useNavigate } from 'react-router-dom'
+
+import Form from '@/components/common/Form'
+import Label from '@/components/common/Label'
+import PageTitle from '@/components/common/PageTitle'
+import TagInput from '@/components/common/TagInput'
+import MainArea from '@/components/layout/MainArea'
+import { Button } from '@/components/ui/button'
+import { toast } from '@/components/ui/use-toast'
+import { SITE_TITLE } from '@/config'
+import { apiPost } from '@/lib/api'
+
+import type { FC } from 'react'
+
+
+export default (() => {
+  const location = useLocation ()
+  const query = new URLSearchParams (location.search)
+  const tagQuery = query.get ('tag') ?? ''
+
+  const navigate = useNavigate ()
+
+  const [file, setFile] = useState<File | null> (null)
+  const [filePreview, setFilePreview] = useState ('')
+  const [sending, setSending] = useState (false)
+  const [tag, setTag] = useState (tagQuery)
+  const [url, setURL] = useState ('')
+
+  const handleSubmit = async () => {
+    const formData = new FormData
+    if (tag)
+      formData.append ('tag', tag)
+    if (file)
+      formData.append ('file', file)
+    if (url)
+      formData.append ('url', url)
+
+    try
+    {
+      setSending (true)
+      await apiPost ('/materials', formData)
+      toast ({ title: '送信成功!' })
+      navigate (`/materials?tag=${ encodeURIComponent (tag) }`)
+    }
+    catch
+    {
+      toast ({ title: '送信失敗……', description: '入力を見直してください．' })
+    }
+    finally
+    {
+      setSending (false)
+    }
+  }
+
+  return (
+      <MainArea>
+	<Helmet>
+	  <title>{`素材追加 | ${ SITE_TITLE }`}</title>
+	</Helmet>
+
+	<Form>
+	  <PageTitle>素材追加</PageTitle>
+
+	  {/* タグ */}
+	  <div>
+	    <Label>タグ</Label>
+	    <TagInput value={tag} setValue={setTag}/>
+	  </div>
+
+	  {/* ファイル */}
+	  <div>
+	    <Label>ファイル</Label>
+	    <input
+		type="file"
+		accept="image/*,video/*,audio/*"
+		onChange={e => {
+		  const f = e.target.files?.[0]
+		  setFile (f ?? null)
+		  setFilePreview (f ? URL.createObjectURL (f) : '')
+		}}/>
+	    {(file && filePreview) && (
+		(/image\/.*/.test (file.type) && (
+		    <img
+			src={filePreview}
+			alt="preview"
+			className="mt-2 max-h-48 rounded border"/>))
+		|| (/video\/.*/.test (file.type) && (
+		    <video
+			src={filePreview}
+			controls
+			className="mt-2 max-h-48 rounded border"/>))
+		|| (/audio\/.*/.test (file.type) && (
+		    <audio
+			src={filePreview}
+			controls
+			className="mt-2 max-h-48"/>))
+		|| (
+		    <p className="text-red-600 dark:text-red-400">
+		      その形式のファイルには対応していません．
+		    </p>))}
+	  </div>
+
+	  {/* 参考 URL */}
+	  <div>
+	    <Label>参考 URL</Label>
+	    <input
+		type="url"
+		value={url}
+		onChange={e => setURL (e.target.value)}
+		className="w-full border p-2 rounded"/>
+	  </div>
+
+	  {/* 送信 */}
+	  <Button
+	      onClick={handleSubmit}
+	      className="px-4 py-2 bg-blue-600 text-white rounded disabled:bg-gray-400"
+	      disabled={sending}>
+	    追加
+	  </Button>
+	</Form>
+      </MainArea>)
+}) satisfies FC

frontend/src/types.ts

@@ -49,6 +49,17 @@ export type FetchTagsParams = {
     limit:        number
     order:        FetchTagsOrder }
 
+export type Material = {
+    id:             number
+    tag:            Tag
+    file:           string | null
+    url:            string | null
+    contentType:    string | null
+    createdAt:      string
+    createdByUser:  { id: number; name: string }
+    updatedAt:      string
+    updatedByUser:  { id: number; name: string } }
+
 export type Menu = MenuItem[]
 
 export type MenuItem = {