Add test cases for newline handling in form payloads

url/urlencoded-filenames.window.js

@@ -0,0 +1,122 @@
+form({
+  filename: "basic-test.txt",
+  expectedFilename: "basic-test.txt",
+  description: "Basic test",
+});
+
+form({
+  filename: "a\0b",
+  expectedFilename: "a%00b",
+  description: "Controls: 0x00",
+});
+
+form({
+  filename: "a\nb",
+  expectedFilename: "a%0Ab",
+  description: "Newlines: \\n",
+});
+
+form({
+  filename: "a\rb",
+  expectedFilename: "a%0Db",
+  description: "Newlines: \\r",
+});
+
+form({
+  filename: "a\n\rb",
+  expectedFilename: "a%0A%0Db",
+  description: "Newlines: \\n\\r",
+});
+
+form({
+  filename: "a\r\nb",
+  expectedFilename: "a%0D%0Ab",
+  description: "Newlines: \\r\\n",
+});
+
+form({
+  filename: 'a"b',
+  expectedFilename: "a%22b",
+  description: "Special punctuation: double quote",
+});
+
+form({
+  filename: "a'b",
+  expectedFilename: "a%27b",
+  description: "Special punctuation: single quote",
+});
+
+form({
+  filename: "a\\b",
+  expectedFilename: "a%5Cb",
+  description: "Special punctuation: backslash",
+});
+
+form({
+  filename: "ábc",
+  expectedFilename: "%C3%A1bc",
+  description: "Non-ASCII",
+});
+
+form({
+  filename: "a\uFFFDb",
+  expectedFilename: "a%26%2365533%3Bb",
+  formEncoding: "windows-1252",
+  description: "Character not in encoding",
+});
+
+function form({
+  filename,
+  expectedFilename,
+  formEncoding = "utf-8",
+  description,
+}) {
+  promise_test(async (testCase) => {
+    if (document.readyState !== "complete") {
+      await new Promise((resolve) => addEventListener("load", resolve));
+    }
+
+    const formTargetFrame = Object.assign(document.createElement("iframe"), {
+      name: "formtargetframe",
+    });
+    document.body.append(formTargetFrame);
+    testCase.add_cleanup(() => {
+      document.body.removeChild(formTargetFrame);
+    });
+
+    const form = Object.assign(document.createElement("form"), {
+      acceptCharset: formEncoding,
+      // Using echo-content-escaped.py rather than /fetch/api/resources/echo-content.py
+      // to work around WebKit not percent-encoding \x00 (which causes the
+      // response to be detected as a binary file and served as a download).
+      // The output should not change if the urlencoded serializer is correct.
+      action: "/FileAPI/file/resources/echo-content-escaped.py",
+      method: "POST",
+      enctype: "application/x-www-form-urlencoded",
+      target: formTargetFrame.name,
+    });
+    document.body.append(form);
+    testCase.add_cleanup(() => {
+      document.body.removeChild(form);
+    });
+
+    const fileInput = Object.assign(document.createElement("input"), {
+      type: "file",
+      name: "file",
+    });
+    form.append(fileInput);
+
+    await new Promise((resolve) => {
+      const dataTransfer = new DataTransfer();
+      dataTransfer.items.add(new File([], filename, { type: "text/plain" }));
+      fileInput.files = dataTransfer.files;
+
+      form.submit();
+      formTargetFrame.onload = resolve;
+    });
+
+    const urlencoded = formTargetFrame.contentDocument.body.textContent;
+    const expected = `file=${expectedFilename}`;
+    assert_equals(urlencoded, expected);
+  }, `Test urlencoding of filenames: ${description}`);
+}