From 41413fea9dae778d072e285c36e6363934422d2c Mon Sep 17 00:00:00 2001
From: Giovanni Abbatepaolo <30571828+bbtgnn@users.noreply.github.com>
Date: Tue, 30 Jan 2024 13:58:15 +0100
Subject: [PATCH] feat: Add DID detail error (#70)

* chore: autoformat

* feat: display fetch error

* feat: add statusText property
---
 explorer/app/details/[did]/page.tsx | 40 ++++++++++++++++++++++++-----
 explorer/lib/fetcher.ts             | 30 +++++++++++++++++-----
 explorer/lib/resolver.ts            | 40 +++++++++++++++++------------
 3 files changed, 80 insertions(+), 30 deletions(-)

diff --git a/explorer/app/details/[did]/page.tsx b/explorer/app/details/[did]/page.tsx
index b2c9b7f..0e67ff8 100644
--- a/explorer/app/details/[did]/page.tsx
+++ b/explorer/app/details/[did]/page.tsx
@@ -7,11 +7,22 @@ import CopyButton from "@/ui/CopyButton";
 import IconButton from "@/ui/IconButton";
 import ArrowLeft from "@/ui/icons/ArrowLeft";
 import Link from "next/link";
+import { DIDResolutionResult } from "did-resolver";
+import { FetchError } from "lib/fetcher";
 
 //
 
 export default async function Page({ params }: { params: { did: string } }) {
-  const document = await resolve(decodeURIComponent(params.did));
+  let document: DIDResolutionResult | undefined = undefined;
+  let error: FetchError | undefined = undefined;
+
+  try {
+    document = await resolve(decodeURIComponent(params.did));
+  } catch (e) {
+    if (e instanceof FetchError) error = e;
+    else
+      error = new FetchError(500, "Something went wrong :O", "Unknown error");
+  }
 
   return (
     <>
@@ -30,13 +41,28 @@ export default async function Page({ params }: { params: { did: string } }) {
         </div>
       </StickyContainer>
 
-      <div className="overflow-auto p-4">
-        <JSONBlock content={document} />
-      </div>
+      {document && (
+        <>
+          <div className="overflow-auto p-4">
+            <JSONBlock content={document} />
+          </div>
+
+          <div className="sticky bottom-0 flex justify-end p-4">
+            <CopyButton text={JSON.stringify(document, null, 2)} />
+          </div>
+        </>
+      )}
 
-      <div className="sticky bottom-0 flex justify-end p-4">
-        <CopyButton text={JSON.stringify(document, null, 2)} />
-      </div>
+      {error && (
+        <div className="overflow-auto p-4">
+          <div className="p-4 bg-red-100 border border-red-600 rounded-lg text-red-600">
+            <p className="font-bold">
+              Error | {error.status} - {error.statusText}
+            </p>
+            <p>{error.message}</p>
+          </div>
+        </div>
+      )}
     </>
   );
 }
diff --git a/explorer/lib/fetcher.ts b/explorer/lib/fetcher.ts
index 56084c5..54f5312 100644
--- a/explorer/lib/fetcher.ts
+++ b/explorer/lib/fetcher.ts
@@ -1,9 +1,27 @@
-const base_url = 'https://did.dyne.org';
+const base_url = "https://did.dyne.org";
 
 export const getData = async (endpoint: string) => {
-    const res = await fetch(`${base_url}/${endpoint}`);
-    if (!res.ok) {
-        throw new Error(`Failed to fetch data from ${endpoint}`);
-    }
-    return res.json();
+  const res = await fetch(`${base_url}/${endpoint}`);
+  if (!res.ok) {
+    throw new FetchError(
+      res.status,
+      `Failed to fetch data from ${endpoint}`,
+      res.statusText
+    );
+  }
+  return res.json();
+};
+
+export class FetchError extends Error {
+  status: number;
+  message: string;
+  statusText: string;
+
+  constructor(status: number, message: string, statusText: string) {
+    super(message);
+    this.name = "FetchError";
+    this.status = status;
+    this.message = message;
+    this.statusText = statusText;
+  }
 }
diff --git a/explorer/lib/resolver.ts b/explorer/lib/resolver.ts
index a8a4c5c..fbccff4 100644
--- a/explorer/lib/resolver.ts
+++ b/explorer/lib/resolver.ts
@@ -1,22 +1,28 @@
-import { DIDResolutionOptions, DIDResolutionResult, ParsedDID, Resolvable, Resolver } from "did-resolver";
+import {
+  DIDResolutionOptions,
+  DIDResolutionResult,
+  ParsedDID,
+  Resolvable,
+  Resolver,
+} from "did-resolver";
 import { getData } from "./fetcher";
 
 const resolver = new Resolver({
-    dyne: async function resolve(
-        did: string,
-        parsed: ParsedDID,
-        didResolver: Resolvable,
-        options: DIDResolutionOptions
-    ): Promise<DIDResolutionResult> {
-        // {method: 'mymethod', id: 'abcdefg', did: 'did:mymethod:abcdefg/some/path#fragment=123', path: '/some/path', fragment: 'fragment=123'}
-        const didDoc = await getData(`dids/${did}`);
-        // If you need to lookup another did as part of resolving this did document, the primary DIDResolver object is passed in as well
-        // const parentDID = await didResolver.resolve(...)
-        // Return the DIDResolutionResult object
-        return didDoc
-    }
-})
+  dyne: async function resolve(
+    did: string,
+    parsed: ParsedDID,
+    didResolver: Resolvable,
+    options: DIDResolutionOptions
+  ): Promise<DIDResolutionResult> {
+    // {method: 'mymethod', id: 'abcdefg', did: 'did:mymethod:abcdefg/some/path#fragment=123', path: '/some/path', fragment: 'fragment=123'}
+    const didDoc = await getData(`dids/${did}`);
+    // If you need to lookup another did as part of resolving this did document, the primary DIDResolver object is passed in as well
+    // const parentDID = await didResolver.resolve(...)
+    // Return the DIDResolutionResult object
+    return didDoc;
+  },
+});
 
 export const resolve = async (didUrl: string): Promise<DIDResolutionResult> => {
-    return await resolver.resolve(didUrl)
-}
+  return await resolver.resolve(didUrl);
+};