Render error pages as HTML

handlers/naddr.ts

@@ -2,6 +2,7 @@ import { Context } from "@oak/oak";
 import { nip19 } from "@nostr/tools";
 import { log } from "../log.ts";
 import { lookupUsernameByPubkey } from "../ldap.ts";
+import notFoundHandler from "../handlers/not-found.ts";
 
 const naddrHandler = async function (ctx: Context) {
   const naddr = ctx.params.path;
@@ -13,13 +14,11 @@ const naddrHandler = async function (ctx: Context) {
     if (username && r.data.identifier) {
       ctx.response.redirect(`/@${username}/${r.data.identifier}`);
     } else {
-      ctx.response.status = 404;
-      ctx.response.body = "Not Found";
+      notFoundHandler(ctx);
     }
   } catch (e) {
     log(e, "yellow");
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
   }
 };
 

handlers/not-found.ts

@@ -0,0 +1,10 @@
+import { Context } from "@oak/oak";
+import { errorPageHtml } from "../html.ts";
+
+const notFoundHandler = function (ctx: Context) {
+  const html = errorPageHtml(404, "Not found");
+  ctx.response.body = html;
+  ctx.response.status = 404;
+};
+
+export default notFoundHandler;

handlers/nprofile.ts

@@ -2,6 +2,7 @@ import { Context } from "@oak/oak";
 import { nip19 } from "@nostr/tools";
 import { log } from "../log.ts";
 import { lookupUsernameByPubkey } from "../ldap.ts";
+import notFoundHandler from "../handlers/not-found.ts";
 
 const nprofileHandler = async function (ctx: Context) {
   const nprofile = ctx.params.path;
@@ -13,13 +14,11 @@ const nprofileHandler = async function (ctx: Context) {
     if (username) {
       ctx.response.redirect(`/@${username}`);
     } else {
-      ctx.response.status = 404;
-      ctx.response.body = "Not Found";
+      notFoundHandler(ctx);
     }
   } catch (e) {
     log(e, "yellow");
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
   }
 };
 

handlers/npub.ts

@@ -2,6 +2,7 @@ import { Context } from "@oak/oak";
 import { nip19 } from "@nostr/tools";
 import { log } from "../log.ts";
 import { lookupUsernameByPubkey } from "../ldap.ts";
+import notFoundHandler from "../handlers/not-found.ts";
 
 const npubHandler = async function (ctx: Context) {
   const npub = ctx.params.path;
@@ -13,13 +14,11 @@ const npubHandler = async function (ctx: Context) {
     if (username) {
       ctx.response.redirect(`/@${username}`);
     } else {
-      ctx.response.status = 404;
-      ctx.response.body = "Not Found";
+      notFoundHandler(ctx);
     }
   } catch (e) {
     log(e, "yellow");
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
   }
 };
 

handlers/user-atom-feed.ts

@@ -5,14 +5,14 @@ import { fetchArticlesByAuthor, fetchProfileEvent } from "../nostr.ts";
 import { profileAtomFeed } from "../feeds.ts";
 import Article from "../models/article.ts";
 import Profile from "../models/profile.ts";
+import notFoundHandler from "../handlers/not-found.ts";
 
 const userAtomFeedHandler = async function (ctx: Context) {
   const username = ctx.params.user.replace(/^(@|~)/, "");
   const pubkey = await lookupPubkeyByUsername(username);
 
   if (!pubkey) {
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
     return;
   }
 
@@ -33,8 +33,7 @@ const userAtomFeedHandler = async function (ctx: Context) {
     }
   } catch (e) {
     log(e, "yellow");
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
   }
 };
 

handlers/user-event.ts

@@ -5,6 +5,7 @@ import { fetchProfileEvent, fetchReplaceableEvent } from "../nostr.ts";
 import Article from "../models/article.ts";
 import Profile from "../models/profile.ts";
 import { articleHtml } from "../html.ts";
+import notFoundHandler from "../handlers/not-found.ts";
 
 const userEventHandler = async function (ctx: Context) {
   const username = ctx.params.user.replace(/^(@|~)/, "");
@@ -12,8 +13,7 @@ const userEventHandler = async function (ctx: Context) {
   const pubkey = await lookupPubkeyByUsername(username);
 
   if (!pubkey) {
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
     return;
   }
 
@@ -31,13 +31,11 @@ const userEventHandler = async function (ctx: Context) {
 
       ctx.response.body = html;
     } else {
-      ctx.response.status = 404;
-      ctx.response.body = "Not Found";
+      notFoundHandler(ctx);
     }
   } catch (e) {
     log(e, "yellow");
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
   }
 };
 

handlers/user-profile.ts

@@ -5,14 +5,14 @@ import { fetchArticlesByAuthor, fetchProfileEvent } from "../nostr.ts";
 import Article from "../models/article.ts";
 import Profile from "../models/profile.ts";
 import { profilePageHtml } from "../html.ts";
+import notFoundHandler from "../handlers/not-found.ts";
 
 const userProfileHandler = async function (ctx: Context) {
   const username = ctx.params.path.replace(/^(@|~)/, "");
   const pubkey = await lookupPubkeyByUsername(username);
 
   if (!pubkey) {
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
     return;
   }
 
@@ -27,13 +27,11 @@ const userProfileHandler = async function (ctx: Context) {
 
       ctx.response.body = html;
     } else {
-      ctx.response.status = 404;
-      ctx.response.body = "Not Found";
+      notFoundHandler(ctx);
     }
   } catch (e) {
     log(e, "yellow");
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
   }
 };
 

html.ts

@@ -2,7 +2,13 @@ import { localizeDate } from "./dates.ts";
 import Article from "./models/article.ts";
 import Profile from "./models/profile.ts";
 
-function htmlLayout(title: string, body: string, profile: Profile): string {
+function htmlLayout(title: string, body: string, profile?: Profile): string {
+  let feedLinksHtml = "";
+  if (profile) {
+    feedLinksHtml =
+      `<link rel="alternate" type="application/atom+xml" href="/@${profile.username}/articles.atom" title="Articles by ${profile.name}" />`;
+  }
+
   return `
     <!DOCTYPE html>
     <html>
@@ -11,7 +17,7 @@ function htmlLayout(title: string, body: string, profile: Profile): string {
       <meta name="viewport" content="width=device-width, initial-scale=1.0">
       <meta http-equiv="X-UA-Compatible" content="ie=edge">
       <title>${title}</title>
-      <link rel="alternate" type="application/atom+xml" href="/@${profile.username}/articles.atom" title="Articles by ${profile.name}" />
+      ${feedLinksHtml}
       <link rel="stylesheet" type="text/css" href="/assets/css/layout.css" />
       <link rel="stylesheet" type="text/css" href="/assets/css/themes/default-light.css" />
     </head>
@@ -22,6 +28,16 @@ function htmlLayout(title: string, body: string, profile: Profile): string {
   `;
 }
 
+export function errorPageHtml(statusCode: number, title: string): string {
+  const body = `
+    <main>
+      <h1>${statusCode} - ${title}</h1>
+    </main>
+  `;
+
+  return htmlLayout(title, body);
+}
+
 export function articleHtml(article: Article, profile: Profile): string {
   const publishedAtFormatted = localizeDate(article.publishedAt);
 

server.ts

@@ -6,6 +6,7 @@ import npubHandler from "./handlers/npub.ts";
 import userProfileHandler from "./handlers/user-profile.ts";
 import userEventHandler from "./handlers/user-event.ts";
 import userAtomFeedHandler from "./handlers/user-atom-feed.ts";
+import notFoundHandler from "./handlers/not-found.ts";
 
 const router = new Router();
 
@@ -21,8 +22,7 @@ router.get("/:path", async (ctx: ctx) => {
   } else if (path.startsWith("@") || path.startsWith("~")) {
     await userProfileHandler(ctx);
   } else {
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
   }
 });
 
@@ -35,8 +35,7 @@ router.get("/:user/:kind.atom", async (ctx: ctx) => {
   ) {
     await userAtomFeedHandler(ctx);
   } else {
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
   }
 });
 
@@ -46,8 +45,7 @@ router.get("/:user/:identifier", async (ctx: ctx) => {
   if (user.startsWith("@") || user.startsWith("~")) {
     await userEventHandler(ctx);
   } else {
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
   }
 });
 
@@ -59,8 +57,7 @@ router.get("/assets/:path*", async (ctx) => {
       root: `${Deno.cwd()}/assets`,
     });
   } catch (_e) {
-    ctx.response.status = 404;
-    ctx.response.body = "Not Found";
+    notFoundHandler(ctx);
   }
 });