#399

2026-07-12 13:14:36 +09:00
@@ -1,44 +1,10 @@
 class PostImportsController < ApplicationController
-  MAPPING_PROPERTIES = ['kind', 'value', 'columns'].freeze
-  MAPPING_KINDS = ['columns', 'fixed'].freeze
-
  before_action :require_member!

-  def parse
-    source =
-        if params[:format] == 'google_sheets'
-          PostImportGoogleSheetsFetcher.fetch!(params[:source],
-                                               rate_key: current_user.id)
-        else
-          params[:source]
-        end
-    format = params[:format] == 'google_sheets' ? 'csv' : params[:format]
-    parsed = PostImportSourceParser.new(
-        source:,
-        format:,
-        has_header: params[:has_header],
-        json_path: params[:json_path]).parse
-    render json: parsed
-  rescue ArgumentError => e
-    render_bad_request(e.message)
-  end
-
  def preview
-    parsed = parsed_params
-    raw_url_column = params[:url_column].presence || (parsed[:columns].length == 1 ? 0 : nil)
-    return render_bad_request('URL 列を選択してください．') if raw_url_column.nil?
-
-    url_column = Integer(raw_url_column, exception: false)
-    if url_column.nil? || url_column.negative? || url_column >= parsed[:columns].length
-      return render_bad_request('URL 列が不正です．')
-    end
-
-    rows = PostImportPreviewer.new(
-        parsed:,
-        url_column:,
-        mappings: mappings_params(parsed[:columns].length),
-        existing: params[:existing]).preview
-    render json: parsed.slice(:columns).merge(rows:)
+    rows = PostImportPreviewer.new(existing: params[:existing]).preview_rows(
+        rows: PostImportUrlListParser.parse(params[:source]))
+    render json: { rows: }
  rescue ArgumentError => e
    render_bad_request(e.message)
  end
@@ -47,11 +13,7 @@ class PostImportsController < ApplicationController
    rows = normalised_import_rows(allow_warning_fields: true)
    changed_row = Integer(params[:changed_row], exception: false)
    result =
-        PostImportPreviewer.new(
-            parsed: { columns: [], rows: [] },
-            url_column: 0,
-            mappings: {},
-            existing: params[:existing])
+        PostImportPreviewer.new(existing: params[:existing])
          .preview_rows(rows:, fetch_metadata: changed_row, metadata_cache: {})
    render json: { rows: result }
  rescue ArgumentError => e
@@ -77,85 +39,7 @@ class PostImportsController < ApplicationController
    head :forbidden
  end

-  def parsed_params
-    value = params.require(:parsed).to_unsafe_h.deep_transform_keys { _1.to_s.underscore }
-    columns = Array(value['columns'])
-    rows = Array(value['rows'])
-    unless columns.all?(Hash) && rows.all?(Hash)
-      raise ArgumentError, '解析結果の形式が不正です．'
-    end
-    raise ArgumentError, '取込件数が多すぎます．' if rows.length > PostImportSourceParser::MAX_ROWS
-    raise ArgumentError, '列数が多すぎます．' if columns.length > 50
-    raise ArgumentError, '解析結果のセルが不正です．' unless rows.all? { |row|
-      values = Array(row['values'])
-      values.length <= columns.length && values.all? { |value|
-        value.is_a?(String) && value.bytesize <= PostImportSourceParser::MAX_CELL_BYTES
-      }
-    }
-    if rows.sum { Array(_1['values']).sum(&:bytesize) } > PostImportSourceParser::MAX_BYTES
-      raise ArgumentError, '解析結果が大きすぎます．'
-    end
-
-    parsed_rows = rows.map do |row|
-      source_row = Integer(row['source_row'], exception: false)
-      raise ArgumentError, '元行番号が不正です．' if source_row.nil? || source_row <= 0
-
-      { source_row:, values: Array(row['values']) }
-    end
-    if parsed_rows.map { _1[:source_row] }.uniq.length != parsed_rows.length
-      raise ArgumentError, '元行番号が重複しています．'
-    end
-
-    { columns: columns.map { |column| column.slice('key', 'label') }, rows: parsed_rows }
-  end
-
-  def mappings_params column_count
-    mappings = params[:mappings]
-    return { } if mappings.blank?
-    raise ArgumentError, '列割当ての形式が不正です．' unless mappings.is_a?(ActionController::Parameters)
-
-    raw = mappings.to_unsafe_h
-    unknown_fields = raw.keys - PostImportPreviewer::FIELDS
-    raise ArgumentError, '列割当て先が不正です．' if unknown_fields.present?
-    raise ArgumentError, '列割当てが大きすぎます．' if raw.to_json.bytesize > PostImportSourceParser::MAX_BYTES
-
-    permitted =
-        mappings.permit(*PostImportPreviewer::FIELDS.map { |field|
-          { field => [:kind, :value, { columns: [] }] }
-        }).to_h
-
-    raw.each_with_object({ }) do |(field, value), result|
-      raise ArgumentError, '列割当ての形式が不正です．' unless value.is_a?(Hash)
-      unless (value.keys - MAPPING_PROPERTIES).empty?
-        raise ArgumentError, '列割当ての項目が不正です．'
-      end
-
-      value = permitted.fetch(field)
-      kind = value['kind'].presence || 'columns'
-      raise ArgumentError, '列割当ての種別が不正です．' unless kind.in?(MAPPING_KINDS)
-      columns = value['columns']
-      raise ArgumentError, '列番号が不正です．' unless (
-        columns.nil? || (columns.is_a?(Array) && columns.all? { |index|
-          parsed = Integer(index, exception: false)
-          parsed && parsed >= 0 && parsed < column_count
-        })
-      )
-      parsed_columns = Array(columns).map { Integer(_1) }
-      raise ArgumentError, '列番号が重複しています．' if parsed_columns.uniq.length != parsed_columns.length
-      raise ArgumentError, '固定値が不正です．' if kind == 'fixed' && !value['value'].is_a?(String)
-      if value['value'].to_s.bytesize > PostImportSourceParser::MAX_CELL_BYTES
-        raise ArgumentError, '固定値が大きすぎます．'
-      end
-
-      result[field] = {
-          'kind' => kind,
-          'value' => value['value'].to_s,
-          'columns' => parsed_columns }
-    end
-  end
-
  def normalised_import_rows allow_warning_fields: false
-    rows = params[:rows]
-    PostImportRowNormaliser.normalise!(rows, allow_warning_fields:)
+    PostImportRowNormaliser.normalise!(params[:rows], allow_warning_fields:)
  end
 end
@@ -1,67 +0,0 @@
-class PostImportGoogleSheetsFetcher
-  HOST = 'docs.google.com'.freeze
-  PUBLICATION_ID = /\A[A-Za-z0-9_-]+\z/
-  GID = /\A\d+\z/
-  RATE_LIMIT = 10
-  RATE_WINDOW = 1.minute
-
-  def self.fetch! raw_url, rate_key:
-    new(raw_url, rate_key:).fetch!
-  end
-
-  def initialize raw_url, rate_key:
-    @raw_url = raw_url.to_s
-    @rate_key = rate_key.to_s
-  end
-
-  def fetch!
-    publication_id, gid = parse!
-    throttle!
-    csv_url = "https://#{ HOST }/spreadsheets/d/e/#{ publication_id }/pub" \
-              "?gid=#{ gid }&single=true&output=csv"
-    response = Preview::HttpFetcher.fetch(csv_url,
-                                          max_bytes: PostImportSourceParser::MAX_BYTES,
-                                          allowed_hosts: [HOST])
-    raise ArgumentError, 'スプレッドシートを CSV として取得できませんでした．' unless csv?(response)
-
-    response.body
-  rescue Preview::UrlSafety::UnsafeUrl, Preview::HttpFetcher::FetchFailed,
-         Preview::HttpFetcher::ResponseTooLarge => e
-    Rails.logger.info(
-      'post_import_google_sheets_fetch_failure '\
-      "#{ { error: e.class.name, message: e.message }.to_json }",
-    )
-    raise ArgumentError, 'スプレッドシートを取得できませんでした．ウェブ公開 URL を確認するか、ファイル保存又はコピー貼付けを使用してください．'
-  end
-
-  private
-
-  def parse!
-    uri = URI.parse(@raw_url)
-    unless uri.scheme == 'https' && uri.host&.downcase == HOST && uri.query.blank?
-      raise ArgumentError, '公開 Google スプレッドシート URL を指定してください．'
-    end
-    match = uri.path.match(%r{\A/spreadsheets/d/e/([^/]+)/pubhtml\z})
-    gid = URI.decode_www_form(uri.fragment.to_s).to_h['gid']
-    unless match && PUBLICATION_ID.match?(match[1]) && GID.match?(gid.to_s)
-      raise ArgumentError, '公開 Google スプレッドシート URL の publication_id 又は gid が不正です．'
-    end
-
-    [match[1], gid]
-  rescue URI::InvalidURIError
-    raise ArgumentError, '公開 Google スプレッドシート URL が不正です．'
-  end
-
-  def throttle!
-    key = "post-import-google-sheets:#{ @rate_key }"
-    count = Rails.cache.increment(key, 1, expires_in: RATE_WINDOW, initial: 0)
-    if count > RATE_LIMIT
-      raise ArgumentError, 'スプレッドシート取得の回数が多すぎます．しばらくしてから再試行してください．'
-    end
-  end
-
-  def csv? response
-    type = response.content_type.to_s.downcase
-    type.include?('text/csv') || type.include?('application/csv')
-  end
-end
@@ -8,96 +8,70 @@ class PostImportPreviewer
    'tags',
    'parent_post_ids',
  ].freeze
-
-  def initialize parsed:, url_column:, mappings: { }, existing: 'skip'
-    @parsed = parsed
-    @url_column = url_column.to_i
-    @mappings = mappings.stringify_keys
+  def initialize existing: 'skip'
    @existing = existing == 'error' ? 'error' : 'skip'
  end

-  def preview
-    preview_rows(rows: @parsed[:rows])
-  end
-
  def preview_rows rows:, fetch_metadata: true, metadata_cache: { }
-    urls = { }
-    rows.map do |row|
-      row = row.symbolize_keys
-      values = row[:values] || []
-      attributes = row[:attributes]&.stringify_keys || FIELDS.to_h { |field|
-        [field, mapped_value(field, values)]
-      }
-      provenance = row[:provenance]&.stringify_keys || mapped_provenance(attributes)
-      tag_sources =
-        row[:tag_sources]&.stringify_keys || initial_tag_sources(attributes, provenance)
-      tag_sources['manual'] = attributes['tags'].to_s if provenance['tags'] == 'manual'
-      url = row[:url].presence || values[@url_column].to_s.strip
-      provenance['url'] ||= row[:url].present? ? 'manual' : 'mapped'
-      url_for_metadata = normalised_url(url) || url
-      existing_post = normalised_url(url).present? && Post.exists?(url: normalised_url(url))
-      if existing_post && @existing == 'skip'
-        next {
-          source_row: row[:source_row],
-          url: normalised_url(url) || url,
-          attributes:,
-          provenance:,
-          tag_sources:,
-          metadata_url: url_for_metadata,
-          fetch_warnings: [],
-          validation_warnings: ['既存投稿のためスキップします．'],
-          warnings: ['既存投稿のためスキップします．'],
-          validation_errors: { },
-          status: 'warning',
-          existing: true,
+    urls = {}
+    rows.map { |row|
+      preview_row(row, urls:, fetch_metadata:, metadata_cache:)
    }
  end
-      url_changed = row[:metadata_url].present? && row[:metadata_url] != url_for_metadata
-      clear_automatic_values!(attributes, provenance, tag_sources) if url_changed
-      attributes['url'] = url
-      fetch_warnings = Array(row[:fetch_warnings]).dup
-      should_fetch =
-          case fetch_metadata
-          when true then true
-          when Integer then fetch_metadata == row[:source_row].to_i
-          when false, nil then false
-          else raise ArgumentError, 'メタデータ取得対象が不正です．'
-          end
-      metadata, fetch_warnings =
-        metadata_for(url_for_metadata, should_fetch, metadata_cache, fetch_warnings)
-      metadata.each do |field, value|
-        if field == 'tags' && provenance[field] != 'manual'
-          tag_sources['automatic'] = value.to_s
-          attributes[field] = merged_tags(tag_sources)
-          next
-        end
-        next unless provenance[field] == 'automatic' || attributes[field].blank?

-        attributes[field] = value
-        provenance[field] = 'automatic'
+  def normalised_url value
+    PostUrlNormaliser.normalise(value)
  end
+
+  private
+
+  def preview_row row, urls:, fetch_metadata:, metadata_cache:
+    row = row.symbolize_keys
+    attributes = initial_attributes(row)
+    provenance = initial_provenance(row)
+    tag_sources = initial_tag_sources(row, attributes, provenance)
+    url = row[:url].to_s.strip
+    provenance['url'] = 'manual'
    normal_url = normalised_url(url)
-      errors = { }
-      errors[:url] = ['URL が不正です．'] if normal_url.blank?
+    url_for_metadata = normal_url || url
+    existing_post = normal_url.present? && Post.exists?(url: normal_url)
+
    validation_warnings = []
-      errors[:url] = ['URL が重複しています．'] if normal_url.present? && urls.key?(normal_url)
+    validation_errors = {}
+    validation_errors[:url] = ['URL が不正です．'] if normal_url.blank?
+    validation_errors[:url] = ['URL が重複しています．'] if normal_url.present? && urls.key?(normal_url)
    urls[normal_url] = true if normal_url.present?
    if normal_url.present? && existing_post
      if @existing == 'error'
-          errors[:url] = ['既存投稿です．']
+        validation_errors[:url] = ['既存投稿です．']
      else
        validation_warnings << '既存投稿のためスキップします．'
      end
    end
-      validate_basic_data(attributes, errors)
+
+    if row[:metadata_url].present? && row[:metadata_url] != url_for_metadata
+      clear_automatic_values!(attributes, provenance, tag_sources)
+    end
+
+    fetch_warnings = Array(row[:fetch_warnings]).dup
+    should_fetch = should_fetch_metadata?(fetch_metadata, row[:source_row].to_i)
+    if should_fetch && !(existing_post && @existing == 'skip')
+      metadata, fetch_warnings =
+        metadata_for(url_for_metadata, metadata_cache, fetch_warnings)
+      apply_metadata!(attributes, provenance, tag_sources, metadata)
+    end
+
+    attributes['url'] = url
+    validate_basic_data(attributes, validation_errors)
    validate_preview_tags(
      merged_tags(tag_sources, provenance['tags']),
-        errors,
+      validation_errors,
      validation_warnings,
    )
-      validate_parents(attributes['parent_post_ids'], errors)
+    validate_parents(attributes['parent_post_ids'], validation_errors)
    attributes.delete('url')
    attributes['tags'] = merged_tags(tag_sources, provenance['tags'])
+
    {
      source_row: row[:source_row],
      url: normal_url || url,
@@ -108,64 +82,40 @@ class PostImportPreviewer
      fetch_warnings:,
      validation_warnings:,
      warnings: fetch_warnings + validation_warnings,
-        validation_errors: errors,
-        status: errors.present? \
+      validation_errors:,
+      status: validation_errors.present? \
                ? 'error' \
                : ((fetch_warnings + validation_warnings).present? ? 'warning' : 'ready'),
-        existing: normal_url.present? && Post.exists?(url: normal_url),
-      }
-    end
-  end
-
-  def metadata_for url, fetch_metadata, cache, previous_warnings
-    return [{ }, previous_warnings] unless fetch_metadata
-
-    cache[url] ||= fetch_metadata(url)
-  end
-
-  def normalised_url value
-    PostUrlNormaliser.normalise(value)
-  end
-
-  private
-
-  def mapped_value field, values
-    mapping = @mappings[field]
-    return '' if mapping.blank?
-    return mapping['value'].to_s if mapping['kind'] == 'fixed'
-
-    Array(mapping['columns']).filter_map { |index|
-      values[index.to_i].to_s.presence
-    }.join(field == 'tags' ? ' ' : '')
-  end
-
-  def mapped_provenance attributes
-    attributes.to_h.to_h { |field, value|
-      mapping = @mappings[field.to_s]
-      origin =
-          if value.present? && mapping&.[]('kind') == 'fixed'
-            'fixed'
-          elsif value.present?
-            'mapped'
-          else
-            'automatic'
-          end
-      [field.to_s, origin]
+      existing: existing_post,
    }
  end

-  def initial_tag_sources attributes, provenance
-    origin = provenance['tags'] == 'fixed' ? 'fixed' : 'mapped'
-    { 'automatic' => '', 'mapped' => origin == 'mapped' ? attributes['tags'].to_s : '',
-      'fixed' => origin == 'fixed' ? attributes['tags'].to_s : '', 'manual' => '' }
+  def should_fetch_metadata? fetch_metadata, source_row
+    case fetch_metadata
+    when true then true
+    when Integer then fetch_metadata == source_row
+    when false, nil then false
+    else raise ArgumentError, 'メタデータ取得対象が不正です．'
+    end
  end

-  def merged_tags sources, origin = nil
-    return sources['manual'].to_s if origin == 'manual'
+  def initial_attributes row
+    attributes = row[:attributes]&.stringify_keys || {}
+    FIELDS.to_h { |field| [field, attributes[field].to_s] }
+  end

-    ['automatic', 'mapped', 'fixed', 'manual'].flat_map {
-      sources[_1].to_s.split
-    }.uniq.join(' ')
+  def initial_provenance row
+    provenance = row[:provenance]&.stringify_keys || {}
+    FIELDS.to_h { |field| [field, provenance[field].presence || 'automatic'] }
+      .merge('url' => 'manual')
+  end
+
+  def initial_tag_sources row, attributes, provenance
+    sources = row[:tag_sources]&.stringify_keys || { 'automatic' => '', 'manual' => '' }
+    sources['automatic'] = sources['automatic'].to_s
+    sources['manual'] =
+      provenance['tags'] == 'manual' ? attributes['tags'].to_s : sources['manual'].to_s
+    sources
  end

  def clear_automatic_values! attributes, provenance, tag_sources
@@ -174,10 +124,15 @@ class PostImportPreviewer
      attributes[field] = '' if provenance[field] == 'automatic'
    end
    tag_sources['automatic'] = ''
+    attributes['tags'] = merged_tags(tag_sources, provenance['tags'])
+  end
+
+  def metadata_for url, cache, previous_warnings
+    cache[url] ||= fetch_metadata(url)
  end

  def fetch_metadata url
-    return [{ }, ['URL が空です．']] if url.blank?
+    return [{}, ['URL が空です．']] if url.blank?

    data = PostMetadataFetcher.fetch(url).stringify_keys
    warnings = []
@@ -191,7 +146,29 @@ class PostImportPreviewer
      "post_import_metadata_fetch_failure "\
      "#{ { error: e.class.name, message: e.message }.to_json }",
    )
-    [{ }, ['メタデータを取得できませんでした．']]
+    [{}, ['メタデータを取得できませんでした．']]
+  end
+
+  def apply_metadata! attributes, provenance, tag_sources, metadata
+    metadata.each do |field, value|
+      if field == 'tags'
+        next if provenance['tags'] == 'manual'
+
+        tag_sources['automatic'] = value.to_s
+        attributes['tags'] = merged_tags(tag_sources)
+        next
+      end
+      next unless provenance[field] == 'automatic' || attributes[field].blank?
+
+      attributes[field] = value
+      provenance[field] = 'automatic'
+    end
+  end
+
+  def merged_tags sources, origin = nil
+    return sources['manual'].to_s if origin == 'manual'
+
+    sources['automatic'].to_s
  end

  def validate_preview_tags raw, errors, warnings
@@ -201,6 +178,7 @@ class PostImportPreviewer
      errors[:tags] = ['ニコニコ・タグは直接指定できません．']
      return
    end
+
    parsed = names.map { |name| TagName.canonicalise(name.sub(/\[.*\]\z/, '')).first }
    existing = Tag.joins(:tag_name).where(tag_names: { name: parsed }).includes(:tag_name).to_a
    deprecated = existing.select(&:deprecated?).map(&:name)
@@ -1,5 +1,5 @@
 class PostImportRowNormaliser
-  ORIGINS = ['automatic', 'mapped', 'fixed', 'manual'].freeze
+  ORIGINS = ['automatic', 'manual'].freeze
  STRING_FIELDS = [
    'title',
    'thumbnail_base',
@@ -13,12 +13,12 @@ class PostImportRowNormaliser

  def self.normalise! rows, allow_warning_fields: false
    raise ArgumentError, '取込行の形式が不正です．' unless rows.is_a?(Array)
-    raise ArgumentError, '取込件数が多すぎます．' if rows.length > PostImportSourceParser::MAX_ROWS
+    raise ArgumentError, '取込件数が多すぎます．' if rows.length > PostImportUrlListParser::MAX_ROWS

    normalised_rows = rows.map { normalise_row!(_1, allow_warning_fields:) }
    source_rows = normalised_rows.map { _1['source_row'] }
    raise ArgumentError, '元行番号が重複しています．' if source_rows.uniq.length != source_rows.length
-    if normalised_rows.sum { row_bytesize(_1) } > PostImportSourceParser::MAX_BYTES
+    if normalised_rows.sum { row_bytesize(_1) } > PostImportUrlListParser::MAX_BYTES
      raise ArgumentError, '取込データが大きすぎます．'
    end

@@ -42,7 +42,7 @@ class PostImportRowNormaliser
    normalise_provenance!(normalised.fetch('provenance', { }))
    normalise_tag_sources!(normalised['tag_sources'])
    normalise_warning_values!(normalised, allow_warning_fields:)
-    if row_bytesize(normalised) > PostImportSourceParser::MAX_BYTES
+    if row_bytesize(normalised) > PostImportUrlListParser::MAX_BYTES
      raise ArgumentError, '取込行が大きすぎます．'
    end

@@ -82,13 +82,13 @@ class PostImportRowNormaliser

  def self.normalise_url! value
    raise ArgumentError, 'URL の形式が不正です．' unless value.is_a?(String)
-    raise ArgumentError, 'URL が長すぎます．' if value.bytesize > PostImportSourceParser::MAX_CELL_BYTES
+    raise ArgumentError, 'URL が長すぎます．' if value.bytesize > PostImportUrlListParser::MAX_URL_BYTES
  end
  private_class_method :normalise_url!

  def self.normalise_metadata_url! value
    raise ArgumentError, 'metadata_url の形式が不正です．' unless value.nil? || value.is_a?(String)
-    if value.to_s.bytesize > PostImportSourceParser::MAX_CELL_BYTES
+    if value.to_s.bytesize > PostImportUrlListParser::MAX_URL_BYTES
      raise ArgumentError, 'metadata_url が長すぎます．'
    end
  end
@@ -107,7 +107,7 @@ class PostImportRowNormaliser
          raise ArgumentError, '取込項目の型が不正です．'
        end
      end
-      if value.to_s.bytesize > PostImportSourceParser::MAX_CELL_BYTES
+      if value.to_s.bytesize > PostImportUrlListParser::MAX_URL_BYTES
        raise ArgumentError, '取込項目が大きすぎます．'
      end
    end
@@ -129,10 +129,10 @@ class PostImportRowNormaliser
    raise ArgumentError, 'タグ由来の形式が不正です．' unless tag_sources.is_a?(Hash)
    raise ArgumentError, 'タグ由来の形式が不正です．' unless (tag_sources.keys - ORIGINS).empty?
    raise ArgumentError, 'タグ由来の形式が不正です．' unless tag_sources.values.all? { _1.is_a?(String) }
-    if tag_sources.values.any? { _1.bytesize > PostImportSourceParser::MAX_CELL_BYTES }
+    if tag_sources.values.any? { _1.bytesize > PostImportUrlListParser::MAX_URL_BYTES }
      raise ArgumentError, 'タグ由来が大きすぎます．'
    end
-    if tag_sources.values.sum(&:bytesize) > PostImportSourceParser::MAX_CELL_BYTES
+    if tag_sources.values.sum(&:bytesize) > PostImportUrlListParser::MAX_URL_BYTES
      raise ArgumentError, 'タグ由来が大きすぎます．'
    end
  end
@@ -148,7 +148,7 @@ class PostImportRowNormaliser
      unless values.is_a?(Array) && values.all? { _1.is_a?(String) }
        raise ArgumentError, '警告の形式が不正です．'
      end
-      if values.any? { _1.bytesize > PostImportSourceParser::MAX_CELL_BYTES }
+      if values.any? { _1.bytesize > PostImportUrlListParser::MAX_URL_BYTES }
        raise ArgumentError, '警告が大きすぎます．'
      end
    end
@@ -21,11 +21,7 @@ class PostImportRunner

  def run_row row
    attributes = row.fetch('attributes', { }).transform_keys { _1.to_s.underscore }
-    preview = PostImportPreviewer.new(
-        parsed: { columns: [], rows: [] },
-        url_column: 0,
-        mappings: {},
-        existing: @existing)
+    preview = PostImportPreviewer.new(existing: @existing)
      .preview_rows(
        rows: [{
          source_row: row['source_row'],
@@ -35,6 +31,10 @@ class PostImportRunner
          tag_sources: row['tag_sources'],
        }],
        fetch_metadata: false).first
+    if @existing == 'skip' && preview[:existing]
+      return row.slice('source_row').merge(status: 'skipped')
+    end
+
    if preview[:validation_errors].present?
      return {
        source_row: row['source_row'],
@@ -43,10 +43,6 @@ class PostImportRunner
      }
    end

-    if @existing == 'skip' && preview[:existing]
-      return row.slice('source_row').merge(status: 'skipped')
-    end
-
    attributes['tags'] = preview[:attributes]['tags']
    attributes['url'] = row['url']
    post = PostCreator.new(actor: @actor, attributes:).create!
@@ -1,118 +0,0 @@
-require 'csv'
-
-class PostImportSourceParser
-  MAX_ROWS = 100
-  MAX_BYTES = 1.megabyte
-  MAX_CELL_BYTES = 20.kilobytes
-  MAX_COLUMNS = 50
-
-  def initialize source:, format:, has_header: false, json_path: nil
-    @source = source.to_s
-    @format = format.to_s
-    @has_header = ActiveModel::Type::Boolean.new.cast(has_header)
-    @json_path = json_path.to_s
-  end
-
-  def parse
-    raise ArgumentError, '入力が大きすぎます．' if @source.bytesize > MAX_BYTES
-
-    @format == 'json' ? parse_json : parse_delimited
-  end
-
-  private
-
-  def parse_delimited
-    separator = @format == 'csv' ? ',' : "\t"
-    table = CSV.parse(@source, col_sep: separator).map { |row| row.map { _1.to_s.strip } }
-    raise ArgumentError, '入力が空です．' if table.empty?
-
-    headers = @has_header ? table.shift : nil
-    ensure_limits!(table)
-    width = table.map(&:length).max.to_i
-    raise ArgumentError, "列数は #{ MAX_COLUMNS } 列までです．" if width > MAX_COLUMNS
-    {
-      columns: (0...width).map { |index|
-        {
-          key: index.to_s,
-          label: "#{ column_name(index) }：#{ headers&.[](index).presence || '列' }",
-        }
-      },
-      rows: table.each_with_index.map { |values, index|
-        { source_row: index + (@has_header ? 2 : 1), values: }
-      },
-    }
-  rescue CSV::MalformedCSVError => e
-    raise ArgumentError, "CSV・TSV の形式が不正です: #{ e.message }"
-  end
-
-  def parse_json
-    value = JSON.parse(@source, max_nesting: 20)
-    @json_path.split('.').reject(&:blank?).each do |part|
-      value =
-          case value
-          when Array
-            index = Integer(part, exception: false)
-            raise ArgumentError if index.nil? || index.negative? || index >= value.length
-
-            value[index]
-          when Hash
-            raise ArgumentError unless value.key?(part) || value.key?(part.to_sym)
-
-            value.key?(part) ? value[part] : value[part.to_sym]
-          else
-            raise ArgumentError
-          end
-    end
-    raise ArgumentError, 'JSON の投稿候補は配列にしてください．' unless value.is_a?(Array)
-
-    ensure_limits!(value)
-    unless value.all?(Hash)
-      invalid = value.each_with_index.filter_map { |item, index|
-        index + 1 unless item.is_a?(Hash)
-      }
-      raise ArgumentError, "JSON の投稿候補は object の配列にしてください: 行 #{ invalid.join(', ') }"
-    end
-    keys = value.flat_map(&:keys).map(&:to_s).uniq
-    raise ArgumentError, "列数は #{ MAX_COLUMNS } 列までです．" if keys.length > MAX_COLUMNS
-    {
-      columns: keys.each_with_index.map { |key, index|
-        { key:, label: "#{ column_name(index) }：#{ key }" }
-      },
-      rows: value.each_with_index.map { |item, index|
-        {
-          source_row: index + 1,
-          values: keys.map { |key|
-            json_value = item.key?(key) ? item[key] : item[key.to_sym]
-            json_cell(json_value)
-          },
-        }
-      },
-    }
-  rescue JSON::ParserError, KeyError, ArgumentError => e
-    raise ArgumentError, "JSON の形式が不正です: #{ e.message }"
-  end
-
-  def ensure_limits! rows
-    raise ArgumentError, "取込件数は #{ MAX_ROWS } 件までです．" if rows.length > MAX_ROWS
-    raise ArgumentError, 'セルが大きすぎます．' if rows.flatten.any? { _1.to_s.bytesize > MAX_CELL_BYTES }
-  end
-
-  def json_cell value
-    case value
-    when nil then ''
-    when String, Numeric, TrueClass, FalseClass then value.to_s
-    when Array, Hash then JSON.generate(value)
-    else raise ArgumentError, 'JSON のセル値が不正です．'
-    end
-  end
-
-  def column_name index
-    name = +''
-    loop do
-      name.prepend((65 + (index % 26)).chr)
-      index = (index / 26) - 1
-      break if index < 0
-    end
-    name
-  end
-end
@@ -0,0 +1,23 @@
+class PostImportUrlListParser
+  MAX_ROWS = 100
+  MAX_BYTES = 1.megabyte
+  MAX_URL_BYTES = 20.kilobytes
+
+  def self.parse source
+    raw = source.to_s
+    raise ArgumentError, '入力が大きすぎます．' if raw.bytesize > MAX_BYTES
+
+    rows = raw.split(/\r\n|\n|\r/).each_with_index.filter_map { |line, index|
+      url = line.strip
+      next if url.blank?
+
+      raise ArgumentError, 'URL が長すぎます．' if url.bytesize > MAX_URL_BYTES
+
+      { source_row: index + 1, url: }
+    }
+    raise ArgumentError, 'URL を入力してください．' if rows.empty?
+    raise ArgumentError, "取込件数は #{ MAX_ROWS } 件までです．" if rows.length > MAX_ROWS
+
+    rows
+  end
+end
@@ -34,7 +34,6 @@ Rails.application.routes.draw do
  end

  scope 'posts/import', controller: :post_imports do
-    post :parse
    post :preview
    post :validate
    post '', action: :create
@@ -21,28 +21,17 @@ import type { User } from '@/types'

 type Props = { user: User | null }

-type Column = {
-    key:   string
-    label: string }
-
-type ParsedRow = {
-    sourceRow: number
-    values:    string[] }
-
-type ParsedImport = {
-    columns: Column[]
-    rows:    ParsedRow[] }
-
-type Origin = 'automatic' | 'mapped' | 'fixed' | 'manual'
-
+type Origin = 'automatic' | 'manual'
+type Phase = 'source' | 'preview' | 'result'
+type RepairMode = 'all' | 'failed'
 type ImportStatus = 'pending' | 'created' | 'skipped' | 'failed'
 type ImportResultStatus = 'created' | 'skipped' | 'failed'
-type Phase = 'source' | 'mapping' | 'preview' | 'result'
+type AttributeValue = string | number

 type ImportRow = {
    sourceRow:         number
    url:               string
-    attributes:        Record<string, string>
+    attributes:        Record<string, AttributeValue>
    warnings:          string[]
    validationErrors:  Record<string, string[]>
    importErrors?:     Record<string, string[]>
@@ -60,41 +49,13 @@ type ImportResultRow = {
    post?:     { id: number }
    errors?:   Record<string, string[]> }

-type Mapping = { columns: string[] }
-type RepairMode = 'all' | 'failed'
-
-const MAPPING_FIELDS = [
-    'title',
-    'thumbnail_base',
-    'original_created_from',
-    'original_created_before',
-    'duration',
-    'tags',
-    'parent_post_ids'] as const
-
 const RESULT_STATUSES: ImportResultStatus[] = ['created', 'skipped', 'failed']
-const MERGE_FIELDS = ['url', 'attributes', 'provenance', 'tagSources'] as const

 const ORIGIN_LABELS: Record<Origin, string> = {
    automatic: '自動取得',
-    mapped:    '入力データ',
-    fixed:     '固定値',
    manual:    '手修正' }


-const detectFormat = (source: string): 'csv' | 'tsv' =>
-    source.includes ('\t')
-    ? 'tsv'
-    : source.includes (',')
-      ? 'csv'
-      : 'tsv'
-
-
-const publicGoogleSheetURL = (source: string): boolean =>
-    /^https:\/\/docs\.google\.com\/spreadsheets\/d\/e\/[A-Za-z0-9_-]+\/pubhtml#gid=\d+$/.test (
-	source.trim ())
-
-
 const mergeValidatedRows = (
    current:   ImportRow[],
    validated: ImportRow[],
@@ -118,111 +79,18 @@ const mergeValidatedRows = (
 	    !(current.some (_1 => _1.sourceRow === row.sourceRow))))


-const mergePreviewRows = (
-    current:   ImportRow[],
-    previewed: ImportRow[],
-): ImportRow[] => {
-    const currentMap = new Map (current.map (row => [row.sourceRow, row]))
-
-    const mergedRows = previewed.map (previewedRow => {
-	const previous = currentMap.get (previewedRow.sourceRow)
-	if (previous == null)
-	  return previewedRow
-	if (previous.importStatus === 'created')
-	  return previous
-
-	const merged = {
-	    ...previewedRow,
-	    attributes: { ...previewedRow.attributes },
-	    provenance: { ...previewedRow.provenance },
-	    tagSources: { ...(previewedRow.tagSources ?? { }) } }
-
-	Object.entries (previous.provenance).forEach (([field, origin]) => {
-	    if (origin !== 'manual')
-	      return
-
-	    if (field === 'url')
-	      {
-		merged.url = previous.url
-		merged.metadataUrl = previous.metadataUrl
-		merged.provenance.url = 'manual'
-		return
-	      }
-	    if (field === 'tags')
-	      {
-		merged.attributes.tags = previous.attributes.tags ?? ''
-		merged.provenance.tags = 'manual'
-		merged.tagSources = {
-		    ...merged.tagSources,
-		    manual: previous.tagSources?.manual ?? previous.attributes.tags ?? '' }
-		return
-	      }
-
-	    merged.attributes[field] = previous.attributes[field] ?? ''
-	    merged.provenance[field] = 'manual'
-	})
-
-	const changed = MERGE_FIELDS.some (field =>
-	    JSON.stringify (previous[field]) !== JSON.stringify (merged[field]))
-
-	return {
-	    ...merged,
-	    importStatus: changed ? 'pending' : previous.importStatus,
-	    createdPostId: previous.createdPostId,
-	    importErrors: changed ? undefined : previous.importErrors }
-    })
-
-    return mergedRows.concat (
-	current.filter (row =>
-	    row.importStatus === 'created'
-	    && !(previewed.some (_1 => _1.sourceRow === row.sourceRow))))
-}
-
-
 const rowMessages = (row: ImportRow): string[] => [
    ...row.warnings,
    ...Object.values (row.validationErrors ?? { }).flat (),
    ...Object.values (row.importErrors ?? { }).flat ()]


-const sampleURLCount = (rows: ParsedRow[], index: number): number =>
-    rows.filter (row => /^https?:\/\//.test (row.values[index] ?? '')).length
-
-
-const renderMappingSelect = (
-    columns: Column[],
-    field:   string,
-    value:   string,
-    update:  (field: string, value: string) => void,
-) => (
-    <label key={field}>
-      {field}
-      <select
-	  value={value}
-	  onChange={ev => update (field, ev.target.value)}>
-	<option value="">指定なし</option>
-	{columns.map ((column, index) => (
-	    <option key={column.key} value={index}>
-	      {column.label}
-	    </option>))}
-      </select>
-    </label>)
-
-
 const PostImportPage: FC<Props> = ({ user }) => {
    const editable = canEditContent (user)

    const [source, setSource] = useState ('')
    const [phase, setPhase] = useState<Phase> ('source')
-    const [format, setFormat] =
-	useState<'csv' | 'tsv' | 'json' | 'google_sheets'> ('tsv')
-    const [hasHeader, setHasHeader] = useState (false)
-    const [jsonPath, setJsonPath] = useState ('')
-    const [urlColumn, setUrlColumn] = useState ('')
-    const [parsed, setParsed] = useState<ParsedImport | null> (null)
-    const [columns, setColumns] = useState<Column[]> ([])
    const [rows, setRows] = useState<ImportRow[]> ([])
-    const [mappings, setMappings] = useState<Record<string, Mapping>> ({ })
    const [existing, setExisting] = useState<'skip' | 'error'> ('skip')
    const [loading, setLoading] = useState (false)
    const [repairMode, setRepairMode] = useState<RepairMode> ('all')
@@ -230,64 +98,16 @@ const PostImportPage: FC<Props> = ({ user }) => {
    const validationGeneration = useRef (0)
    const rowRefs = useRef<Record<number, HTMLElement | null>> ({ })

-    const parseSource = async () => {
-	setLoading (true)
-	try
-	{
-	    const data = await apiPost<ParsedImport> ('/posts/import/parse', {
-		source,
-		format,
-		has_header: hasHeader,
-		json_path: jsonPath,
-		existing })
-	    setColumns (data.columns)
-	    setParsed (data)
-	    setMappings ({ })
-	    setRows ([])
-	    setRepairMode ('all')
-	    if (data.columns.length === 1)
-	      {
-		setUrlColumn ('0')
-	      }
-	    else
-	      {
-		const candidate = data.columns
-		    .map ((_, index) => ({
-			index,
-			count: sampleURLCount (data.rows, index) }))
-		    .sort ((a, b) => b.count - a.count)[0]
-		setUrlColumn (candidate?.count ? String (candidate.index) : '')
-	      }
-	    setPhase ('mapping')
-	}
-	catch
-	{
-	    toast ({
-		title: '読込みに失敗しました',
-		description: '入力形式を確認してください．' })
-	}
-	finally
-	{
-	    setLoading (false)
-	}
-    }
-
    const preview = async () => {
-	if (!parsed || urlColumn === '')
-	  return
-
 	setLoading (true)
 	try
 	{
 	    const data = await apiPost<{ rows: ImportRow[] }> ('/posts/import/preview', {
-		parsed: { columns: parsed.columns, rows: parsed.rows },
-		url_column: urlColumn,
-		mappings,
+		source,
 		existing })
-	    const mergedRows = mergePreviewRows (rows, data.rows)
-	    setRows (mergedRows)
+	    setRows (data.rows)
+	    setRepairMode ('all')
 	    setPhase ('preview')
-	    await validateRows (mergedRows, -1)
 	}
 	catch (error)
 	{
@@ -297,7 +117,7 @@ const PostImportPage: FC<Props> = ({ user }) => {
 		    ?? error.response?.data?.baseErrors?.[0]
 		: undefined
 	    toast ({
-		title: '投稿プレビューに失敗しました',
+		title: '投稿情報の取得に失敗しました',
 		description: message ?? '入力を確認してください．' })
 	}
 	finally
@@ -309,6 +129,7 @@ const PostImportPage: FC<Props> = ({ user }) => {
    const validateRows = async (
 	nextRows:    ImportRow[],
 	changedRow: number,
+	existingValue = existing,
    ) => {
 	const generation = ++validationGeneration.current
 	setLoading (true)
@@ -316,7 +137,7 @@ const PostImportPage: FC<Props> = ({ user }) => {
 	{
 	    const validated = await apiPost<{ rows: ImportRow[] }> ('/posts/import/validate', {
 		rows: nextRows.filter (row => row.importStatus !== 'created'),
-		existing,
+		existing: existingValue,
 		changed_row: changedRow })
 	    if (generation === validationGeneration.current)
 	      setRows (current => mergeValidatedRows (current, validated.rows))
@@ -337,7 +158,7 @@ const PostImportPage: FC<Props> = ({ user }) => {
 	const next = {
 	    ...row,
 	    attributes: { ...row.attributes, [field]: value },
-	    provenance: { ...row.provenance, [field]: 'manual' },
+	    provenance: { ...row.provenance, [field]: 'manual' as const },
 	    importStatus: 'pending' as const,
 	    importErrors: undefined }
 	const nextRows = rows.map ((currentRow, rowIndex) =>
@@ -358,7 +179,7 @@ const PostImportPage: FC<Props> = ({ user }) => {
 	const next = {
 	    ...row,
 	    url: value,
-	    provenance: { ...row.provenance, url: 'manual' },
+	    provenance: { ...row.provenance, url: 'manual' as const },
 	    importStatus: 'pending' as const,
 	    importErrors: undefined }
 	const nextRows = rows.map ((currentRow, rowIndex) =>
@@ -386,22 +207,26 @@ const PostImportPage: FC<Props> = ({ user }) => {
 	setRows (pendingRows)
 	try
 	{
-	    const generation = ++validationGeneration.current
-	    setLoading (true)
-	    const validated = await apiPost<{ rows: ImportRow[] }> ('/posts/import/validate', {
-		rows: pendingRows.filter (row => row.importStatus !== 'created'),
-		existing: value,
-		changed_row: -1 })
-	    if (generation === validationGeneration.current)
-	      setRows (current => mergeValidatedRows (current, validated.rows))
+	    await validateRows (pendingRows, -1, value)
 	}
-	finally
+	catch
 	{
-	    if (validationGeneration.current > 0)
-	      setLoading (false)
+	    toast ({ title: '既存投稿の再検証に失敗しました' })
 	}
    }

+    const retryRow = (sourceRow: number) =>
+	setRows (current => current.map (row =>
+	    row.sourceRow === sourceRow && row.importStatus === 'failed'
+	    ? { ...row, importStatus: 'pending', importErrors: undefined }
+	    : row))
+
+    const retryRowFromResult = (sourceRow: number) => {
+	retryRow (sourceRow)
+	setRepairMode ('failed')
+	setPhase ('preview')
+    }
+
    const submit = async () => {
 	const targets = rows.filter (row =>
 	    row.importStatus == null || row.importStatus === 'pending')
@@ -454,23 +279,6 @@ const PostImportPage: FC<Props> = ({ user }) => {
 	}
    }

-    const updateMapping = (field: string, value: string) =>
-	setMappings (current => ({
-	    ...current,
-	    [field]: { columns: value === '' ? [] : [value] } }))
-
-    const retryRow = (sourceRow: number) =>
-	setRows (current => current.map (row =>
-	    row.sourceRow === sourceRow && row.importStatus === 'failed'
-	    ? { ...row, importStatus: 'pending', importErrors: undefined }
-	    : row))
-
-    const retryRowFromResult = (sourceRow: number) => {
-	retryRow (sourceRow)
-	setRepairMode ('failed')
-	setPhase ('preview')
-    }
-
    const resultRows = rows.filter (row =>
 	row.importStatus != null && RESULT_STATUSES.includes (row.importStatus))
    const failedCount = rows.filter (row => row.importStatus === 'failed').length
@@ -508,165 +316,36 @@ const PostImportPage: FC<Props> = ({ user }) => {
 	   ? (
 	      <Form>
 		<p className="text-sm text-neutral-600 dark:text-neutral-300">
-		  URL を一行に一件ずつ貼り付けるか、
-		  CSV・TSV・JSON を入力してください．
+		  URL を一行に一件ずつ入力してください．
 		</p>
-		{publicGoogleSheetURL (source) && (
-		    <fieldset className="space-y-1 rounded border p-3 dark:border-neutral-700">
-		      <legend>公開 Google スプレッドシート URL</legend>
-		      <label className="mr-3">
-			<input
-			    type="radio"
-			    checked={format === 'google_sheets'}
-			    onChange={() => setFormat ('google_sheets')}/>
-			シート内データを読み込む
-		      </label>
-		      <label>
-			<input
-			    type="radio"
-			    checked={format !== 'google_sheets'}
-			    onChange={() => setFormat ('tsv')}/>
-			URL 自体を投稿として扱う
-		      </label>
-		    </fieldset>)}
-		<FormField label="入力形式">
-		  {() => (
-		      <select
-			  value={format}
-			  onChange={ev => setFormat (ev.target.value as typeof format)}
-			  className={inputClass (false)}>
-			<option value="tsv">テキスト・TSV</option>
-			<option value="csv">CSV</option>
-			<option value="json">JSON</option>
-			<option value="google_sheets">
-			  公開 Google スプレッドシート
-			</option>
-		      </select>)}
-		</FormField>
-		<FormField label="入力データ">
+		<FormField label="URL リスト">
 		  {() => (
 		      <textarea
 			  value={source}
 			  rows={12}
 			  className={inputClass (false)}
-			  onChange={ev => {
-			      setSource (ev.target.value)
-			      if (format !== 'json' && format !== 'google_sheets')
-				setFormat (detectFormat (ev.target.value))
-			  }}/>)}
+			  onChange={ev => setSource (ev.target.value)}/>)}
 		</FormField>
-		<input
-		    type="file"
-		    accept=".txt,.csv,.tsv,.json"
-		    onChange={ev => {
-			const file = ev.target.files?.[0]
-			if (file)
-			  {
-			    file.text ().then (text => {
-				setSource (text)
-				setFormat (
-				    file.name.endsWith ('.json')
-				    ? 'json'
-				    : detectFormat (text))
-			    })
-			  }
-		    }}/>
-		{format !== 'json' && (
-		    <label className="flex gap-2">
-		      <input
-			  type="checkbox"
-			  checked={hasHeader}
-			  onChange={ev => setHasHeader (ev.target.checked)}/>
-		      見出し行を使用する
-		    </label>)}
-		{format === 'json' && (
-		    <FormField label="投稿候補の位置（例: data.posts）">
-		      {() => (
-			  <input
-			      value={jsonPath}
-			      onChange={ev => setJsonPath (ev.target.value)}
-			      className={inputClass (false)}/>)}
-		    </FormField>)}
-		{format === 'google_sheets' && (
-		    <p className="text-sm text-neutral-600 dark:text-neutral-300">
-		      非公開シートには対応していません．
-		      ウェブ公開 URL を使用するか、CSV を保存して選択、
-		      又は内容を貼り付けてください．
-		    </p>)}
-		<Button
-		    type="button"
-		    onClick={parseSource}
-		    disabled={loading || !(source)}>
-		  列を解析
-		</Button>
-	      </Form>)
-	   : phase === 'mapping' && parsed
-	     ? (
-		<Form>
-		  <PageTitle>列の割当て</PageTitle>
-		  <p>URL 列と補助列を指定してから、投稿情報を取得します．</p>
 		<label>
-		    URL 列
+		  既存投稿
 		  <select
-			value={urlColumn}
-			onChange={ev => setUrlColumn (ev.target.value)}>
-		      <option value="">選択してください</option>
-		      {columns.map ((column, index) => (
-			  <option key={column.key} value={index}>
-			    {column.label}
-			  </option>))}
+		      value={existing}
+		      onChange={ev => setExisting (ev.target.value as typeof existing)}>
+		    <option value="skip">スキップ</option>
+		    <option value="error">エラー</option>
 		  </select>
 		</label>
-		  {MAPPING_FIELDS.map (field =>
-		      renderMappingSelect (columns,
-					   field,
-					   mappings[field]?.columns?.[0] ?? '',
-					   updateMapping))}
-		  <div className="overflow-x-auto">
-		    <table className="text-sm">
-		      <thead>
-			<tr>
-			  {columns.map (column => (
-			      <th key={column.key}>{column.label}</th>))}
-			</tr>
-		      </thead>
-		      <tbody>
-			{parsed.rows.slice (0, 5).map (row => (
-			    <tr key={row.sourceRow}>
-			      {row.values.map ((value, index) => (
-				  <td key={index}>{value}</td>))}
-			    </tr>))}
-		      </tbody>
-		    </table>
-		  </div>
-		  <Button
-		      type="button"
-		      variant="outline"
-		      onClick={() => setPhase ('source')}>
-		    入力元へ戻る
-		  </Button>
 		<Button
 		    type="button"
 		    onClick={preview}
-		      disabled={loading || urlColumn === ''}>
-		    投稿情報を取得して確認
+		    disabled={loading || !(source.trim ())}>
+		  投稿情報を取得
 		</Button>
 	      </Form>)
 	   : phase === 'preview'
 	     ? (
 		<div className="space-y-4">
 		  <div className="flex flex-wrap gap-3 rounded border p-3 dark:border-neutral-700">
-		      <label>
-			URL 列
-			<select
-			    value={urlColumn}
-			    onChange={ev => setUrlColumn (ev.target.value)}>
-			  {columns.map ((column, index) => (
-			      <option key={column.key} value={index}>
-				{column.label}
-			      </option>))}
-			</select>
-		      </label>
 		    <label>
 		      既存投稿
 		      <select
@@ -676,18 +355,6 @@ const PostImportPage: FC<Props> = ({ user }) => {
 			<option value="error">エラー</option>
 		      </select>
 		    </label>
-		      {MAPPING_FIELDS.map (field =>
-			  renderMappingSelect (columns,
-					       field,
-					       mappings[field]?.columns?.[0] ?? '',
-					       updateMapping))}
-		      <Button
-			  type="button"
-			  variant="outline"
-			  onClick={preview}
-			  disabled={loading}>
-			自動取得を更新
-		      </Button>
 		  </div>
 		  {repairMode === 'failed' && (
 		      <p className="text-sm text-neutral-600 dark:text-neutral-300">
@@ -711,9 +378,9 @@ const PostImportPage: FC<Props> = ({ user }) => {
 		      variant="outline"
 		      onClick={() => {
 			  setRepairMode ('all')
-			    setPhase ('mapping')
+			  setPhase ('source')
 		      }}>
-		      列割当てへ戻る
+		    URL リスト入力へ戻る
 		  </Button>
 		  <Button
 		      type="button"
@@ -773,7 +440,7 @@ const PostImportPage: FC<Props> = ({ user }) => {
 			  setRepairMode ('all')
 			  setPhase ('source')
 		      }}>
-		      新しい入力元を選ぶ
+		    URL リスト入力へ戻る
 		  </Button>
 		</div>)}
 	</MainArea>)
@@ -814,23 +481,23 @@ const RowCard = (
 		onCommit={value => updateURL (index, value)}/>
 	    <EditableValue
 		label="タイトル"
-		value={row.attributes.title ?? ''}
+		value={String (row.attributes.title ?? '')}
 		origin={row.provenance.title}
 		onCommit={value => update (index, 'title', value)}/>
 	    <EditableValue
 		label="サムネール基底 URL"
-		value={row.attributes.thumbnailBase ?? ''}
+		value={String (row.attributes.thumbnailBase ?? '')}
 		origin={row.provenance.thumbnailBase}
 		onCommit={value => update (index, 'thumbnailBase', value)}/>
-	    <ThumbnailPreview url={row.attributes.thumbnailBase ?? ''}/>
+	    <ThumbnailPreview url={String (row.attributes.thumbnailBase ?? '')}/>
 	    <EditableValue
 		label="作成日時 From"
-		value={row.attributes.originalCreatedFrom ?? ''}
+		value={String (row.attributes.originalCreatedFrom ?? '')}
 		origin={row.provenance.originalCreatedFrom}
 		onCommit={value => update (index, 'originalCreatedFrom', value)}/>
 	    <EditableValue
 		label="作成日時 Before"
-		value={row.attributes.originalCreatedBefore ?? ''}
+		value={String (row.attributes.originalCreatedBefore ?? '')}
 		origin={row.provenance.originalCreatedBefore}
 		onCommit={value => update (index, 'originalCreatedBefore', value)}/>
 	    <EditableValue
@@ -840,12 +507,12 @@ const RowCard = (
 		onCommit={value => update (index, 'duration', value)}/>
 	    <EditableValue
 		label="タグ"
-		value={row.attributes.tags ?? ''}
+		value={String (row.attributes.tags ?? '')}
 		origin={row.provenance.tags}
 		onCommit={value => update (index, 'tags', value)}/>
 	    <EditableValue
 		label="親投稿"
-		value={row.attributes.parentPostIds ?? ''}
+		value={String (row.attributes.parentPostIds ?? '')}
 		origin={row.provenance.parentPostIds}
 		onCommit={value => update (index, 'parentPostIds', value)}/>
 	    {row.importStatus === 'failed' && (