fix #1617 - refactor User page handler

carbonmark/components/pages/Users/SellerConnected/Forms/EditProfile.tsx

@@ -7,6 +7,7 @@ import { Spinner } from "components/shared/Spinner";
 import { Text } from "components/Text";
 import { isAddress } from "ethers-v6";
 import { getUser, loginUser, postUser, putUser, verifyUser } from "lib/api";
+import { VALID_HANDLE_REGEX } from "lib/constants";
 import { User } from "lib/types/carbonmark.types";
 import { isNil } from "lodash";
 import { FC, useState } from "react";
@@ -150,7 +151,7 @@ export const EditProfile: FC<Props> = (props) => {
                       message: t`Handle is required`,
                     },
                     pattern: {
-                      value: /^[a-zA-Z0-9]+$/, // no special characters!
+                      value: VALID_HANDLE_REGEX, // no special characters!
                       message: t`Handle should not contain any special characters`,
                     },
                     validate: {

carbonmark/lib/constants.ts

@@ -53,6 +53,8 @@ const ENVIRONMENT: Environment =
 
 export const MINIMUM_TONNE_PRICE = 0.1;
 export const CARBONMARK_FEE = 0.0; // 0%
+/** No special chars */
+export const VALID_HANDLE_REGEX = /^[a-zA-Z0-9]+$/;
 
 export const getConnectErrorStrings = () => ({
   default: t({

carbonmark/pages/users/[user].tsx

@@ -1,19 +1,105 @@
-import { isAddress } from "ethers-v6";
-import { GetStaticProps } from "next";
-import { ParsedUrlQuery } from "querystring";
-
 import { PageProps, Users } from "components/pages/Users";
+import { isAddress } from "ethers-v6";
+import { client } from "lib/api/client";
+import { VALID_HANDLE_REGEX } from "lib/constants";
 import { loadTranslation } from "lib/i18n";
 import { getAddressByDomain } from "lib/shared/getAddressByDomain";
 import { getIsDomainInURL } from "lib/shared/getIsDomainInURL";
-
-import { client } from "lib/api/client";
-import { User } from "lib/types/carbonmark.types";
+import { GetStaticProps } from "next";
+import { ParsedUrlQuery } from "querystring";
 
 interface Params extends ParsedUrlQuery {
   user: string;
 }
 
+type UserType = "address" | "domain" | "handle";
+
+/**
+ * Validates the user param and returns the type, otherwise throws if invalid
+ * */
+const getUserType = (user: string): UserType => {
+  if (isAddress(user)) return "address";
+  if (VALID_HANDLE_REGEX.test(user)) return "handle";
+  if (getIsDomainInURL(user)) return "domain";
+  throw new Error(
+    `Param '${user}' is invalid. Must be handle, address, or domain.`
+  );
+};
+
+/**
+ * Attempts to resolve a valid 0x address string to a user handle.
+ * Redirects if handle is found, otherwise render empty page props.
+ * */
+const resolveAddress = async (params: { address: string; locale?: string }) => {
+  const response = await client["/users/{walletOrHandle}"].get({
+    params: { walletOrHandle: params.address },
+  });
+  // Might also be a 404 or invalid API response, but we let those silently fail (page can still render)
+  const carbonmarkUser = !!response.ok ? await response.json() : null;
+  // Handle urls are canonical & more user friendly, redirect if possible
+  if (carbonmarkUser?.handle) {
+    return {
+      redirect: {
+        destination: `/users/${carbonmarkUser.handle}`,
+        permanent: true,
+      },
+    };
+  }
+  const translation = await loadTranslation(params.locale);
+  if (!translation) {
+    throw new Error("No translation found");
+  }
+  return {
+    props: {
+      userAddress: params.address,
+      userDomain: null,
+      carbonmarkUser, // may be null -- all we need is a valid address
+      translation,
+      fixedThemeName: "theme-light",
+    },
+    revalidate: 10,
+  };
+};
+
+/**
+ * Attempts to resolve a valid KNS or ENS domain. Throws if domain can't be resolved.
+ * */
+const resolveDomain = async (params: { domain: string; locale?: string }) => {
+  // sad path: this throws and is caught by parent -> 404
+  const address = await getAddressByDomain(params.domain);
+  return resolveAddress({ address, locale: params.locale });
+};
+
+/**
+ * Attempts to resolve a valid user handle. Throws if handle can't be resolved.
+ * */
+const resolveHandle = async (params: { handle: string; locale?: string }) => {
+  const response = await client["/users/{walletOrHandle}"].get({
+    params: { walletOrHandle: params.handle },
+  });
+
+  const carbonmarkUser = !!response.ok ? await response.json() : null;
+  if (!carbonmarkUser?.wallet) {
+    throw new Error(`${params.handle} could not be resolved`);
+  }
+
+  const translation = await loadTranslation(params.locale);
+  if (!translation) {
+    throw new Error("No translation found");
+  }
+
+  return {
+    props: {
+      userAddress: carbonmarkUser.wallet,
+      userDomain: null,
+      carbonmarkUser,
+      translation,
+      fixedThemeName: "theme-light",
+    },
+    revalidate: 10,
+  };
+};
+
 export const getStaticProps: GetStaticProps<PageProps, Params> = async (
   ctx
 ) => {
@@ -24,64 +110,15 @@ export const getStaticProps: GetStaticProps<PageProps, Params> = async (
   }
 
   try {
-    const translation = await loadTranslation(locale);
-
-    if (!translation) {
-      throw new Error("No translation found");
+    const userType = getUserType(params.user);
+    switch (userType) {
+      case "address":
+        return resolveAddress({ address: params.user, locale });
+      case "domain":
+        return resolveDomain({ domain: params.user, locale });
+      case "handle":
+        return resolveHandle({ handle: params.user, locale });
     }
-
-    const userInUrl = params.user;
-    const isDomainInURL = getIsDomainInURL(userInUrl);
-    const isValidAddress = !isDomainInURL && isAddress(userInUrl);
-
-    let carbonmarkUser: User | null = null;
-
-    if (!isDomainInURL && !isValidAddress) {
-      const response = await client["/users/{walletOrHandle}"].get({
-        params: { walletOrHandle: params.user },
-      });
-      if (response.ok) {
-        carbonmarkUser = await response.json();
-      } else {
-        throw new Error("Not a valid user address");
-      }
-    }
-
-    let userAddress: string;
-    if (isDomainInURL) {
-      userAddress = await getAddressByDomain(userInUrl); // this fn should throw if it fails to resolve
-    } else {
-      userAddress = carbonmarkUser?.wallet || userInUrl;
-    }
-
-    // Haven't fetched carbonmark API yet?
-    if (!carbonmarkUser) {
-      const response = await client["/users/{walletOrHandle}"].get({
-        params: {
-          walletOrHandle: userAddress,
-        },
-      });
-      if (response.ok) {
-        const userData = await response.json();
-        return {
-          redirect: {
-            destination: `/users/${userData?.handle}`,
-            permanent: true,
-          },
-        };
-      }
-    }
-
-    return {
-      props: {
-        userAddress,
-        userDomain: isDomainInURL ? userInUrl : null,
-        carbonmarkUser,
-        translation,
-        fixedThemeName: "theme-light",
-      },
-      revalidate: 10,
-    };
   } catch (e) {
     console.error("Failed to generate Carbonmark Users Page", e);
     return {