From b672fc190d7df163449e91400c6d6a08a3775835 Mon Sep 17 00:00:00 2001
From: Alexandre Alapetite <alexandre@alapetite.fr>
Date: Sun, 11 Nov 2018 17:31:50 +0100
Subject: Tweaks for Vienna RSS (#2093)

* Tweaks for Vienna RSS

https://github.com/FreshRSS/FreshRSS/issues/2091
https://github.com/ViennaRSS/vienna-rss/issues/1197

* Fix get feed by URL

* Fix get item ids returning starred elements

* API add item ids by feed URL

* Add API filter `it`

https://feedhq.readthedocs.io/en/latest/api/reference.html#stream-items-ids

* API add `nt=` filter + refactoring

* No ; prefix for author

https://github.com/FreshRSS/FreshRSS/issues/2091#issuecomment-435562495

* Add id long form prefix and accept short id form

https://github.com/FreshRSS/FreshRSS/issues/2091#issuecomment-435631259

* Fix quote problem

https://github.com/FreshRSS/FreshRSS/issues/2091#issuecomment-435683930

* Isolate bug fix for News+

https://github.com/FreshRSS/FreshRSS/issues/2091#issuecomment-435687041

* Rework encoding conventions

https://github.com/FreshRSS/FreshRSS/issues/2091#issuecomment-437441834

* Unicode escaping alternative

Alternative approach to encode XML special characters and other
problematic characters into their Unicode fullwidth version when we
cannot use HTML-encoding because clients disagree wether they should
HTML-decode or not.
https://github.com/FreshRSS/FreshRSS/issues/2091#issuecomment-436059559
---
 lib/lib_rss.php | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'lib/lib_rss.php')

diff --git a/lib/lib_rss.php b/lib/lib_rss.php
index 4087f6faf..52e4408d2 100644
--- a/lib/lib_rss.php
+++ b/lib/lib_rss.php
@@ -102,6 +102,18 @@ function safe_ascii($text) {
 	return filter_var($text, FILTER_DEFAULT, FILTER_FLAG_STRIP_LOW | FILTER_FLAG_STRIP_HIGH);
 }
 
+function escapeToUnicodeAlternative($text) {
+	$text = htmlspecialchars_decode($text, ENT_QUOTES);
+	// https://raw.githubusercontent.com/mihaip/google-reader-api/master/wiki/StreamId.wiki
+	return trim(str_replace(
+			//Problematic characters
+			array("'", '"', '^', '<', '>', '?', '&', '\\', '/', ',', ';'),
+			//Use their fullwidth Unicode form instead:
+			array("’", '＂', '＾', '＜', '＞', '？', '＆', '＼', '／', '，', '；'),
+			$text
+		));
+}
+
 /**
  * Test if a given server address is publicly accessible.
  *
-- 
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