1 files changed, 23 insertions, 0 deletions
diff --git a/testing/web-platform/tests/url/resources/percent-encoding.py b/testing/web-platform/tests/url/resources/percent-encoding.py
new file mode 100644
index 0000000000..e8fbb7d3b3
--- /dev/null
+++ b/testing/web-platform/tests/url/resources/percent-encoding.py
@@ -0,0 +1,23 @@
+import base64
+from wptserve.utils import isomorphic_decode
+
+# Use numeric references to let the HTML parser take care of inserting the correct code points
+# rather than trying to figure out the necessary bytes for each encoding. (The latter can be
+# especially tricky given that Python does not implement the Encoding Standard.)
+def numeric_references(input):
+    output = b""
+    for cp in input:
+        output += b"&#x" + format(ord(cp), u"X").encode(u"utf-8") + b";"
+    return output
+
+def main(request, response):
+    # Undo the "magic" space with + replacement as otherwise base64 decoding will fail.
+    value = request.GET.first(b"value").replace(b" ", b"+")
+    encoding = request.GET.first(b"encoding")
+
+    output_value = numeric_references(base64.b64decode(value).decode(u"utf-8"))
+    return (
+        [(b"Content-Type", b"text/html;charset=" + encoding)],
+        b"""<!doctype html>
+<a href="https://doesnotmatter.invalid/?%s#%s">test</a>
+""" % (output_value, output_value))