#399

backend/app/controllers/posts_controller.rb

@@ -120,30 +120,64 @@ class PostsController < ApplicationController
     return head :forbidden unless current_user.gte_member?
     return render_bad_request('URL は必須です．') if params[:url].blank?
 
-    preview = PostImportPreviewer.new.preview_rows(
-        rows: [{
-            source_row: 1,
-            url: params[:url].to_s,
-            attributes: { },
-            provenance: { },
-            tag_sources: { } }],
-        fetch_metadata: true).first
-    return render_validation_error fields: preview[:validation_errors] if preview[:validation_errors].present?
+    normal_url = PostUrlNormaliser.normalise(params[:url].to_s)
+    return render_validation_error(fields: { url: ['URL が不正です．'] }) if normal_url.blank?
+
+    Preview::UrlSafety.validate(normal_url)
+    existing_post = Post.with_attached_thumbnail.find_by(url: normal_url)
+    if existing_post.present?
+      return render json: {
+          url: normal_url,
+          title: nil,
+          thumbnail_base: nil,
+          tags: nil,
+          original_created_from: nil,
+          original_created_before: nil,
+          duration: nil,
+          video_ms: nil,
+          field_warnings: { },
+          base_warnings: [],
+          existing_post: compact_post(existing_post.id) }
+    end
+
+    metadata = PostMetadataFetcher.fetch(normal_url)
+    field_warnings = { }
+    field_warnings[:title] = ['タイトルを取得できませんでした．'] if metadata[:title].blank?
+    if metadata[:thumbnail_base].blank?
+      field_warnings[:thumbnail_base] = ['サムネールを取得できませんでした．']
+    end
 
     render json: {
-        url: preview[:url],
-        title: preview[:attributes]['title'],
-        thumbnail_base: preview[:attributes]['thumbnail_base'],
-        tags: preview[:attributes]['tags'],
-        original_created_from: preview[:attributes]['original_created_from'],
-        original_created_before: preview[:attributes]['original_created_before'],
-        duration: preview[:attributes]['duration'],
-        video_ms: preview[:attributes]['video_ms'],
-        field_warnings: preview[:field_warnings],
-        base_warnings: preview[:base_warnings],
-        existing_post: compact_post(preview[:existing_post_id]) }
+        url: normal_url,
+        title: metadata[:title],
+        thumbnail_base: metadata[:thumbnail_base],
+        tags: metadata[:tags],
+        original_created_from: metadata[:original_created_from],
+        original_created_before: metadata[:original_created_before],
+        duration: metadata[:duration],
+        video_ms: metadata[:video_ms],
+        field_warnings: field_warnings,
+        base_warnings: [],
+        existing_post: nil }
   rescue ArgumentError => e
     render_bad_request e.message
+  rescue Preview::UrlSafety::UnsafeUrl => e
+    render_validation_error fields: { url: [e.message] }
+  rescue Preview::HttpFetcher::FetchFailed,
+         Preview::HttpFetcher::FetchTimeout,
+         Preview::HttpFetcher::ResponseTooLarge
+    render json: {
+        url: normal_url,
+        title: nil,
+        thumbnail_base: nil,
+        tags: nil,
+        original_created_from: nil,
+        original_created_before: nil,
+        duration: nil,
+        video_ms: nil,
+        field_warnings: { url: ['自動取得に失敗しました．'] },
+        base_warnings: [],
+        existing_post: nil }
   end
 
   def show