Standardize POST canonicalization query strings with pywb (#68)

* Make non-GET query canonicalization consistent with new spec

This is part of bringing consistency between pywb and warcio.js
with regard to how query parameters are constructed from request
bodies for non-GET requests.

The more complicated test is duplicated in pywb to help ensure
that the results are consistent across our toolsets/packages.

src/lib/utils.ts

@@ -157,13 +157,41 @@ export function jsonToQueryParams(json: string | any, ignoreInvalid = true) {
     return key + "." + ++dupes[key] + "_";
   };
 
-  try {
-    JSON.stringify(json, (k, v) => {
-      if (!["object", "function"].includes(typeof v)) {
-        q.set(getKey(k), v);
+  const parser = (jsonObj: object, key="") => {
+    let queryValue = "";
+
+    // if object, attempt to recurse through key/value pairs
+    if (typeof(jsonObj) === "object" && !(jsonObj instanceof Array)) {
+      try {
+        for (const [key, value] of Object.entries(jsonObj)) {
+          parser(value, key);
+        }
+      } catch (e) {
+        // special case for null
+        if (jsonObj === null) {
+          queryValue = "null";
+        }
+      }
+    }
+
+    // if array, recurse through values, re-using key
+    else if (jsonObj instanceof Array) {
+      for (let i=0; i < jsonObj.length; i++) {
+        parser(jsonObj[i], key);
       }
-      return v;
-    });
+    }
+
+    if (["string", "number", "boolean"].includes(typeof(jsonObj))) {
+      queryValue = jsonObj.toString();
+    }
+
+    if (queryValue) {
+      q.set(getKey(key), queryValue);
+    }
+  };
+
+  try {
+    parser(json);
   } catch (e) {
     if (!ignoreInvalid) {
       throw e;

test/testUtils.test.ts

@@ -34,6 +34,22 @@ describe("utils", () => {
     ).toBe("abc=def&data=bar&bar=2&a=3&a.2_=4&bar.2_=123&a.3_=5");
   });
 
+  test("another json with more complicated data", () => {
+    expect(
+      toQuery({
+       "type": "event",
+       "id": 44.0,
+       "float": 35.7,
+       "values": [true, false, null],
+       "source": {
+          "type": "component",
+          "id": "a+b&c= d",
+          "values": [3, 4]
+       }
+      })
+    ).toBe("type=event&id=44&float=35.7&values=true&values.2_=false&values.3_=null&type.2_=component&id.2_=a%2Bb%26c%3D+d&values.4_=3&values.5_=4");
+  });
+
   test("post-to-get empty", () => {
     const request = {
       postData: "",