1 files changed, 50 insertions, 1 deletions
diff --git a/config/initializers/twitter_regex.rb b/config/initializers/twitter_regex.rb
index 0ddbbee98..87815d458 100644
--- a/config/initializers/twitter_regex.rb
+++ b/config/initializers/twitter_regex.rb
@@ -29,7 +29,7 @@ module Twitter
       (                                                                                     #   $1 total match
         (#{REGEXEN[:valid_url_preceding_chars]})                                            #   $2 Preceding character
         (                                                                                   #   $3 URL
-          ((https?|dat|dweb|ipfs|ipns|ssb|gopher):\/\/)?                                    #   $4 Protocol (optional)
+          ((?:https?|dat|dweb|ipfs|ipns|ssb|gopher):\/\/)?                                  #   $4 Protocol (optional)
           (#{REGEXEN[:valid_domain]})                                                       #   $5 Domain(s)
           (?::(#{REGEXEN[:valid_port_number]}))?                                            #   $6 Port number (optional)
           (/#{REGEXEN[:valid_url_path]}*)?                                                  #   $7 URL Path and anchor
@@ -37,5 +37,54 @@ module Twitter
         )
       )
     }iox
+    REGEXEN[:validate_nodeid] = /(?:
+      #{REGEXEN[:validate_url_unreserved]}|
+      #{REGEXEN[:validate_url_pct_encoded]}|
+      [!$()*+,;=]
+    )/iox
+    REGEXEN[:validate_resid] = /(?:
+      #{REGEXEN[:validate_url_unreserved]}|
+      #{REGEXEN[:validate_url_pct_encoded]}|
+      #{REGEXEN[:validate_url_sub_delims]}
+    )/iox
+    REGEXEN[:valid_xmpp_uri] = %r{
+      (                                                                                     #   $1 total match
+        (#{REGEXEN[:valid_url_preceding_chars]})                                            #   $2 Preceding character
+        (                                                                                   #   $3 URL
+          ((?:xmpp):)                                                                       #   $4 Protocol
+          (//#{REGEXEN[:validate_nodeid]}+@#{REGEXEN[:valid_domain]}/)?                     #   $5 Authority (optional)
+          (#{REGEXEN[:validate_nodeid]}+@)?                                                 #   $6 Username in path (optional)
+          (#{REGEXEN[:valid_domain]})                                                       #   $7 Domain in path
+          (/#{REGEXEN[:validate_resid]}+)?                                                  #   $8 Resource in path (optional)
+          (\?#{REGEXEN[:valid_url_query_chars]}*#{REGEXEN[:valid_url_query_ending_chars]})? #   $9 Query String
+        )
+      )
+    }iox
+  end
+
+  module Extractor
+    # Extracts a list of all XMPP URIs included in the Tweet <tt>text</tt> along
+    # with the indices. If the <tt>text</tt> is <tt>nil</tt> or contains no
+    # XMPP URIs an empty array will be returned.
+    #
+    # If a block is given then it will be called for each XMPP URI.
+    def extract_xmpp_uris_with_indices(text, options = {}) # :yields: uri, start, end
+      return [] unless text && text.index(":")
+      urls = []
+
+      text.to_s.scan(Twitter::Regex[:valid_xmpp_uri]) do
+        valid_uri_match_data = $~
+
+        start_position = valid_uri_match_data.char_begin(3)
+        end_position = valid_uri_match_data.char_end(3)
+
+        urls << {
+          :url => valid_uri_match_data[3],
+          :indices => [start_position, end_position]
+        }
+      end
+      urls.each{|url| yield url[:url], url[:indices].first, url[:indices].last} if block_given?
+      urls
+    end
   end
 end