add default cors proxy

.changeset/unlucky-melons-divide.md

@@ -0,0 +1,5 @@
+---
+"nostrudel": minor
+---
+
+Add <url> and <encoded_url> options to CORS proxy url

.changeset/violet-walls-dance.md

@@ -0,0 +1,5 @@
+---
+"nostrudel": minor
+---
+
+Use corsproxy.io as default service for CORS proxy

src/helpers/cors.ts

@@ -3,15 +3,27 @@ import { convertToUrl } from "./url";
 
 const corsFailedHosts = new Set();
 
+export function createCorsUrl(url: URL | string, corsProxy = appSettings.value.corsProxy) {
+  if (!corsProxy) return url;
+
+  if (corsProxy.includes("<url>")) {
+    return corsProxy.replace("<url>", "" + url);
+  } else if (corsProxy.includes("<encoded_url>")) {
+    return corsProxy.replace("<encoded_url>", encodeURIComponent("" + url));
+  } else {
+    return corsProxy.endsWith("/") ? corsProxy + url : corsProxy + "/" + url;
+  }
+}
+
 export function fetchWithCorsFallback(url: URL | string, opts?: RequestInit) {
   if (!appSettings.value.corsProxy) return fetch(url, opts);
 
   if (corsFailedHosts.has(convertToUrl(url).host)) {
-    return fetch(appSettings.value.corsProxy + url, opts);
+    return fetch(createCorsUrl(url), opts);
   }
 
   return fetch(url, opts).catch((e) => {
     corsFailedHosts.add(convertToUrl(url).host);
-    return fetch(appSettings.value.corsProxy + url, opts);
+    return fetch(createCorsUrl(url), opts);
   });
 }

src/services/settings/migrations.ts

@@ -42,7 +42,7 @@ export const defaultSettings: AppSettings = {
 
   primaryColor: "#8DB600",
   imageProxy: "",
-  corsProxy: "",
+  corsProxy: "https://corsproxy.io/?<encoded_url>",
   showContentWarning: true,
   twitterRedirect: undefined,
   redditRedirect: undefined,

src/views/settings/privacy-settings.tsx

@@ -11,10 +11,12 @@ import {
   Input,
   Link,
   FormErrorMessage,
+  Code,
 } from "@chakra-ui/react";
 import { useFormContext } from "react-hook-form";
 import { safeUrl } from "../../helpers/parse";
 import { AppSettings } from "../../services/settings/migrations";
+import { createCorsUrl } from "../../helpers/cors";
 
 async function validateInvidiousUrl(url?: string) {
   if (!url) return true;
@@ -31,7 +33,7 @@ async function validateCorsProxy(url?: string) {
   try {
     const controller = new AbortController();
     const timeoutId = setTimeout(() => controller.abort(), 2000);
-    const res = await fetch(new URL("/https://example.com", url), { signal: controller.signal });
+    const res = await fetch(createCorsUrl("https://example.com", url), { signal: controller.signal });
     return res.ok || "Cant reach instance";
   } catch (e) {
     return "Cant reach instance";
@@ -122,16 +124,26 @@ export default function PrivacySettings() {
             <FormLabel>CORS Proxy</FormLabel>
             <Input
               type="url"
-              placeholder="https://cors.example.com/"
+              placeholder="https://corsproxy.io/?<encoded_url>"
-              {...register("corsProxy", { setValueAs: safeUrl, validate: validateCorsProxy })}
+              {...register("corsProxy", { validate: validateCorsProxy })}
             />
             {formState.errors.corsProxy && <FormErrorMessage>{formState.errors.corsProxy.message}</FormErrorMessage>}
             <FormHelperText>
-              This is used as a fallback when verifying NIP-05 ids and fetching open-graph metadata. URL to an instance
+              This is used as a fallback ( to bypass CORS restrictions ) when verifying NIP-05 ids and fetching
-              of{" "}
+              open-graph metadata.
+              <br />
+              This can either point to an instance of{" "}
               <Link href="https://github.com/Rob--W/cors-anywhere" isExternal color="blue.500">
                 cors-anywhere
-              </Link>
+              </Link>{" "}
+              or{" "}
+              <Link href="https://corsproxy.io/" isExternal color="blue.500">
+                corsproxy.io
+              </Link>{" "}
+              <br />
+              <Code fontSize="0.9em">{`<url>`}</Code> or <Code fontSize="0.9em">{`<encoded_url>`}</Code> can be used to
+              inject the raw or the encoded url into the proxy url ( example:{" "}
+              <Code fontSize="0.9em">{`https://corsproxy.io/?<encoded_url>`}</Code> )
             </FormHelperText>
           </FormControl>
         </Flex>