Escape special characters for GraphQL

sledgehammer999 · sledgehammer999 · commit ef342e482e22 · 2020-05-18T13:46:46.000+03:00
diff --git a/AmendTitleAndApplyLabel/issuegatherer.cpp b/AmendTitleAndApplyLabel/issuegatherer.cpp
@@ -114,6 +114,33 @@ bool IssueGatherer::matchAndAmendTitle(const std::regex &regex, std::string &tit
 
     title = std::regex_replace(title, regex, "");
 
+    // We need to escape special characters(eg double quotes) for GraphQL
+    // Strings literals need 2 levels of escape
+    // Example title: Test "x"
+    // Correctly escaped it should look like this
+    // when the GraphQL query string is printed: Test \\\"x\\\"
+    // But in C++ those backslashes must be escaped too!!!
+    std::string buffer;
+    buffer.reserve(title.size() + 6); // reserve 6 extra characters. Usually there shouldn't be more than one pair of doublequotes
+    for (auto ch : title) {
+        switch (ch) {
+        case '\"':
+            buffer.append("\\\\\\\"");
+            break;
+        case '\\':
+            buffer.append("\\\\\\\\");
+            break;
+        case '/':
+            buffer.append("\\\\\\/");
+            break;
+        default:
+            buffer.append(1, ch);
+            break;
+        }
+    }
+
+    title.swap(buffer);
+
     return true;
 }
 
