#399

backend/app/services/post_import_previewer.rb

@@ -55,7 +55,7 @@ class PostImportPreviewer
     source = row.symbolize_keys
     url = source[:url].to_s.strip
     normal_url = normalised_url(url)
-    source.merge(url_text: url, normal_url:)
+    source.merge(url_text: url, normal_url:, url_error: validate_url_safety(normal_url))
   end
 
   def preview_row row,
@@ -78,6 +78,9 @@ class PostImportPreviewer
 
     validation_errors = {}
     validation_errors[:url] = ['URL が不正です．'] if normal_url.blank?
+    if row[:url_error].present?
+      validation_errors[:url] = [row[:url_error]]
+    end
     if normal_url.present? && url_counts[normal_url].to_i > 1
       validation_errors[:url] = ['URL が重複しています．']
     end
@@ -206,8 +209,7 @@ class PostImportPreviewer
       add_field_warning!(warnings, 'thumbnail_base', THUMBNAIL_FETCH_WARNING)
     end
     { data:, warnings: }
-  rescue Preview::UrlSafety::UnsafeUrl,
-         Preview::HttpFetcher::FetchFailed,
+  rescue Preview::HttpFetcher::FetchFailed,
          Preview::HttpFetcher::ResponseTooLarge => e
     Rails.logger.info(
         "post_import_metadata_fetch_failure "\
@@ -252,6 +254,7 @@ class PostImportPreviewer
   def preload_metadata! prepared_rows, fetch_metadata, metadata_cache, existing_posts, url_counts
     urls = prepared_rows.filter_map { |row|
       next unless row[:normal_url].present?
+      next if row[:url_error].present?
       next unless should_fetch_metadata?(fetch_metadata, row[:source_row].to_i)
       next if url_counts[row[:normal_url]].to_i > 1
       next if existing_posts.key?(row[:normal_url])
@@ -339,12 +342,22 @@ class PostImportPreviewer
   def should_apply_metadata_to_row? row, fetch_metadata, existing_posts, url_counts
     normal_url = row[:normal_url]
     return false if normal_url.blank?
+    return false if row[:url_error].present?
     return false if url_counts[normal_url].to_i > 1
     return false if existing_posts.key?(normal_url)
 
     should_fetch_metadata?(fetch_metadata, row[:source_row].to_i)
   end
 
+  def validate_url_safety normal_url
+    return nil if normal_url.blank?
+
+    Preview::UrlSafety.validate(normal_url)
+    nil
+  rescue Preview::UrlSafety::UnsafeUrl => e
+    e.message
+  end
+
   def apply_metadata! attributes, provenance, tag_sources, metadata
     metadata.each do |field, value|
       if field == 'tags'

backend/app/services/post_import_runner.rb

@@ -46,6 +46,13 @@ class PostImportRunner
     end
 
     { source_row: row['source_row'], status: 'failed', errors: e.record.errors.to_hash }
+  rescue ActiveRecord::RecordNotUnique
+    existing_post = existing_post_for_race(row)
+    raise unless existing_post
+
+    { source_row: row['source_row'],
+      status: 'skipped',
+      existing_post_id: existing_post.id }
   rescue Tag::NicoTagNormalisationError
     { source_row: row['source_row'],
       status: 'failed',
@@ -66,8 +73,10 @@ class PostImportRunner
       errors: { base: ['登録中にエラーが発生しました．'] } }
   end
 
-  def existing_post_for_race row, record
-    return nil unless record.errors.of_kind?(:url, :taken)
+  def existing_post_for_race row, record = nil
+    if record && !(record.errors.of_kind?(:url, :taken))
+      return nil
+    end
 
     normal_url = PostUrlNormaliser.normalise(row['url'])
     return nil if normal_url.blank?