#399

backend/app/models/post.rb

@@ -158,10 +158,8 @@ class Post < ApplicationRecord
   def attach_thumbnail_from_url! raw_url
     response = Preview::ThumbnailFetcher.fetch_image_response(raw_url)
     thumbnail.attach(
-        io: StringIO.new(response.body),
-        filename: remote_thumbnail_filename(response.url),
-        content_type: response.content_type)
-    resized_thumbnail!
+        self.class.resized_thumbnail_attachment(
+            StringIO.new(response.body)))
   rescue Preview::UrlSafety::UnsafeUrl,
          Preview::ThumbnailFetcher::GenerationFailed,
          Preview::HttpFetcher::FetchFailed,
@@ -173,15 +171,6 @@ class Post < ApplicationRecord
 
   private
 
-  def remote_thumbnail_filename url
-    filename = File.basename(URI.parse(url).path.to_s)
-    return filename if filename.present? && filename != '/'
-
-    'thumbnail'
-  rescue URI::InvalidURIError
-    'thumbnail'
-  end
-
   def validate_original_created_range
     f = parse_original_created_value(:original_created_from)
     b = parse_original_created_value(:original_created_before)

backend/app/services/post_metadata_fetcher.rb

@@ -81,12 +81,22 @@ class PostMetadataFetcher
     day = match[3].to_i
     hour = match[4].to_i
     minute = match[5]&.to_i || 0
+    second = match[6]&.to_i || 0
+    fraction = match[7]
     offset = match[8]
+    nanoseconds = parse_nanoseconds(fraction)
     timestamp =
         if offset.present?
-          Time.new(year, month, day, hour, minute, 0, parse_offset(offset)).in_time_zone
+          Time.new(
+              year,
+              month,
+              day,
+              hour,
+              minute,
+              second + Rational(nanoseconds, 1_000_000_000),
+              parse_offset(offset)).in_time_zone
         else
-          Time.zone.local(year, month, day, hour, minute)
+          Time.zone.local(year, month, day, hour, minute, second).change(nsec: nanoseconds)
         end
 
     from = timestamp.change(sec: 0, nsec: 0)
@@ -94,6 +104,13 @@ class PostMetadataFetcher
     [from, before]
   end
 
+  def self.parse_nanoseconds value
+    return 0 if value.blank?
+
+    digits = value[0, 9].ljust(9, '0')
+    Integer(digits, 10)
+  end
+
   def self.parse_offset value
     return '+00:00' if value == 'Z'
 
@@ -109,6 +126,7 @@ class PostMetadataFetcher
   private_class_method :platform_tags,
                        :original_created_range,
                        :parse_timestamp_range,
+                       :parse_nanoseconds,
                        :parse_offset,
                        :serialise_time
 end