Add support for redirecting GNU Social

src/background/modules/AutoRemoteFollow.js

@@ -5,13 +5,20 @@
  */
 
 import {INTERACTION_TYPE} from "./data/INTERACTION_TYPE.js";
+
 import * as MastodonDetect from "./Detect/Mastodon.js";
+import * as GnuSocialDetect from "./Detect/GnuSocial.js";
+
 import * as MastodonRedirect from "./MastodonRedirect.js";
 
 const FEDIVERSE_TYPE = Object.freeze({
     MASTODON: Symbol("mastodon"),
     GNU_SOCIAL: Symbol("GNU Social")
 });
+const FEDIVERSE_MODULE = Object.freeze({
+    [FEDIVERSE_TYPE.MASTODON]: MastodonDetect,
+    [FEDIVERSE_TYPE.GNU_SOCIAL]: GnuSocialDetect
+});
 
 /**
  * Listens for Mastodon requests at tab update.
@@ -42,6 +49,9 @@ async function handleTabUpdate(tabId, changeInfo) {
     case FEDIVERSE_TYPE.MASTODON:
         detectModule = MastodonDetect;
         break;
+    case FEDIVERSE_TYPE.GNU_SOCIAL:
+        detectModule = GnuSocialDetect;
+        break;
     default:
         throw new Error(`unknown fediverse type: ${software.toString()}`);
     }
@@ -73,9 +83,11 @@ async function handleTabUpdate(tabId, changeInfo) {
  * @returns {[FEDIVERSE_TYPE, Symbol]|null}
  */
 function getInteractionType(url) {
-    for (const [checkRegEx, interactionType] of MastodonDetect.CATCH_URLS) {
+    for (const fedType of Object.values(FEDIVERSE_TYPE)) {
-        if (url.pathname.match(checkRegEx)) {
+        for (const [checkRegEx, interactionType] of FEDIVERSE_MODULE[fedType].CATCH_URLS) {
-            return [FEDIVERSE_TYPE.MASTODON, interactionType];
+            if (url.pathname.match(checkRegEx)) {
+                return [fedType, interactionType];
+            }
         }
     }
 

src/background/modules/Detect/GnuSocial.js

@@ -0,0 +1,50 @@
+/**
+ * Module, that detects a GNU Social instance and returns the required values.
+ *
+ * @module Detect/GnuSocial
+ */
+
+import {NotSupportedError} from "/common/modules/Errors.js";
+import {INTERACTION_TYPE} from "../data/INTERACTION_TYPE.js";
+
+// https://regex101.com/r/8vTzty/1
+const REMOTE_FOLLOW_REGEX = /\/main\/ostatus\/nickname\/(.+)\/?$/;
+
+/** The URLs to intercept and pass to this module. */
+export const CATCH_URLS = new Map();
+CATCH_URLS.set(REMOTE_FOLLOW_REGEX, INTERACTION_TYPE.FOLLOW);
+
+/**
+ * Find the follow URL.
+ *
+ * @function
+ * @private
+ * @returns {Promise}
+ */
+export function getTootUrl() {
+    throw new NotSupportedError("getTootUrl() is not supported");
+}
+
+/**
+ * Returns the username of the given OStatus page.
+ *
+ * @private
+ * @function
+ * @param {URL} url
+ * @returns {string|undefined}
+ */
+export function getUsername(url) {
+    const match = REMOTE_FOLLOW_REGEX.exec(url.pathname);
+    return match[1];
+}
+
+/**
+ * Returns the server from the required URL.
+ *
+ * @function
+ * @param {URL} url
+ * @returns {string|undefined}
+ */
+export function getServer(url) {
+    return url.host;
+}