feat: add the ability to configure query params encoding for requests (#4412)

Co-authored-by: nivedin <nivedinp@gmail.com>
Co-authored-by: jamesgeorge007 <25279263+jamesgeorge007@users.noreply.github.com>

packages/hoppscotch-common/src/platform/std/interceptors/helpers.ts

@@ -0,0 +1,54 @@
+import { AxiosRequestConfig } from "axios"
+import { cloneDeep } from "lodash-es"
+import { useSetting } from "~/composables/settings"
+
+// Helper function to check if a string is already encoded
+const isEncoded = (value: string) => {
+  try {
+    return value !== decodeURIComponent(value)
+  } catch (e) {
+    return false // in case of malformed URI sequence
+  }
+}
+
+export const preProcessRequest = (
+  req: AxiosRequestConfig
+): AxiosRequestConfig => {
+  const reqClone = cloneDeep(req)
+  const encodeMode = useSetting("ENCODE_MODE")
+
+  // If the parameters are URLSearchParams, inject them to URL instead
+  // This prevents issues of marshalling the URLSearchParams to the proxy
+  if (reqClone.params instanceof URLSearchParams) {
+    try {
+      const url = new URL(reqClone.url ?? "")
+
+      for (const [key, value] of reqClone.params.entries()) {
+        let finalValue = value
+        if (
+          encodeMode.value === "enable" ||
+          (encodeMode.value === "auto" &&
+            /[!@#$%^&*()_+\-=\[\]{};':"\\|,.<>\/?]+/.test(value))
+        ) {
+          // Check if the value is already encoded (e.g., contains % symbols)
+          if (!isEncoded(value)) {
+            finalValue = encodeURIComponent(value)
+          }
+        }
+
+        // Set the parameter with the final value
+        url.searchParams.append(key, finalValue)
+      }
+
+      // decode the URL to prevent double encoding
+      reqClone.url = decodeURIComponent(url.toString())
+    } catch (e) {
+      // making this a non-empty block, so we can make the linter happy.
+      // we should probably use, allowEmptyCatch, or take the time to do something with the caught errors :)
+    }
+
+    reqClone.params = {}
+  }
+
+  return reqClone
+}