X-Git-Url: https://git.immae.eu/?a=blobdiff_plain;f=application%2FUrl.php;h=b37593773b920c26d3a9e5332d197dc17fb44449;hb=0ecfca3b9d14f152b1b1e8b20e2c4f27b37ad4f7;hp=25a62a8ab3fb5dafa02870ab968418038ef21d37;hpb=fc11ab2f290a3712b766d78fdbcd354625a35d0a;p=github%2Fshaarli%2FShaarli.git

diff --git a/application/Url.php b/application/Url.php
index 25a62a8a..b3759377 100644
--- a/application/Url.php
+++ b/application/Url.php
@@ -63,6 +63,30 @@ function add_trailing_slash($url)
     return $url . (!endsWith($url, '/') ? '/' : '');
 }
 
+/**
+ * Replace not whitelisted protocols by 'http://' from given URL.
+ *
+ * @param string $url       URL to clean
+ * @param array  $protocols List of allowed protocols (aside from http(s)).
+ *
+ * @return string URL with allowed protocol
+ */
+function whitelist_protocols($url, $protocols)
+{
+    if (startsWith($url, '?') || startsWith($url, '/')) {
+        return $url;
+    }
+    $protocols = array_merge(['http', 'https'], $protocols);
+    $protocol = preg_match('#^(\w+):/?/?#', $url, $match);
+    // Protocol not allowed: we remove it and replace it with http
+    if ($protocol === 1 && ! in_array($match[1], $protocols)) {
+        $url = str_replace($match[0], 'http://', $url);
+    } else if ($protocol !== 1) {
+        $url = 'http://' . $url;
+    }
+    return $url;
+}
+
 /**
  * URL representation and cleanup utilities
  *