Merge pull request #23934 from vespa-engine/vekterli/factor-out-xml-string-escapingv8.48.22

Factor out XML string escaping and use for internal legacy status pages [run-systemtest]

1 files changed, 79 insertions, 0 deletions

diff --git a/vespalib/src/vespa/vespalib/util/string_escape.cpp b/vespalib/src/vespa/vespalib/util/string_escape.cpp
new file mode 100644
index 00000000000..d1b38f84c3e
--- /dev/null
+++ b/vespalib/src/vespa/vespalib/util/string_escape.cpp
@@ -0,0 +1,79 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+#include "string_escape.h"
+#include <vespa/vespalib/stllike/asciistream.h>
+#include <vector>
+#include <ostream>
+
+namespace vespalib {
+
+namespace {
+
+std::vector<bool> precompute_escaped_xml_chars() {
+    std::vector<bool> vec(256, false);
+    for (uint32_t i=0; i<32; ++i) {
+        vec[i] = true;
+    }
+    vec['\n'] = false;
+    vec['<'] = true;
+    vec['>'] = true;
+    vec['&'] = true;
+    return vec;
+}
+
+std::vector<bool> escaped_xml_chars = precompute_escaped_xml_chars();
+
+template <typename StreamT>
+void do_write_xml_content_escaped(StreamT& out, vespalib::stringref str) {
+    for (const char s : str) {
+        if (escaped_xml_chars[static_cast<uint8_t>(s)]) {
+            if      (s == '<') out << "&lt;";
+            else if (s == '>') out << "&gt;";
+            else if (s == '&') out << "&amp;";
+            else {
+                out << "&#" << static_cast<int>(s) << ";";
+            }
+        } else {
+            out << s;
+        }
+    }
+}
+
+}
+
+vespalib::string xml_attribute_escaped(vespalib::stringref str) {
+    vespalib::asciistream ost;
+    for (const char s : str) {
+        if (s == '"' || s == '\'' || s == '\n'
+            || escaped_xml_chars[static_cast<uint8_t>(s)])
+        {
+            if      (s == '<')  ost << "&lt;";
+            else if (s == '>')  ost << "&gt;";
+            else if (s == '&')  ost << "&amp;";
+            else if (s == '"')  ost << "&quot;";
+            else if (s == '\'') ost << "&#39;";
+            else {
+                ost << "&#" << static_cast<int>(s) << ";";
+            }
+        } else {
+            ost << s;
+        }
+    }
+    return ost.str();
+}
+
+vespalib::string xml_content_escaped(vespalib::stringref str) {
+    vespalib::asciistream out;
+    do_write_xml_content_escaped(out, str);
+    return out.str();
+}
+
+void write_xml_content_escaped(vespalib::asciistream& out, vespalib::stringref str) {
+    do_write_xml_content_escaped(out, str);
+}
+
+void write_xml_content_escaped(std::ostream& out, vespalib::stringref str) {
+    do_write_xml_content_escaped(out, str);
+}
+
+}