IndieAuth support (#1811)

* Able to authenticate user against IndieAuth. For #1273

* WIP server indieauth endpoint. For https://github.com/owncast/owncast/issues/1272

* Add migration to remove access tokens from user

* Add authenticated bool to user for display purposes

* Add indieauth modal and auth flair to display names. For #1273

* Validate URLs and display errors

* Renames, cleanups

* Handle relative auth endpoint paths. Add error handling for missing redirects.

* Disallow using display names in use by registered users. Closes #1810

* Verify code verifier via code challenge on callback

* Use relative path to authorization_endpoint

* Post-rebase fixes

* Use a timestamp instead of a bool for authenticated

* Propertly handle and display error in modal

* Use auth'ed timestamp to derive authenticated flag to display in chat

* don't redirect unless a URL is present

avoids redirecting to `undefined` if there was an error

* improve error message if owncast server URL isn't set

* fix IndieAuth PKCE implementation

use SHA256 instead of SHA1, generates a longer code verifier (must be 43-128 chars long), fixes URL-safe SHA256 encoding

* return real profile data for IndieAuth response

* check the code verifier in the IndieAuth server

* Linting

* Add new chat settings modal anad split up indieauth ui

* Remove logging error

* Update the IndieAuth modal UI. For #1273

* Add IndieAuth repsonse error checking

* Disable IndieAuth client if server URL is not set.

* Add explicit error messages for specific error types

* Fix bad logic

* Return OAuth-keyed error responses for indieauth server

* Display IndieAuth error in plain text with link to return to main page

* Remove redundant check

* Add additional detail to error

* Hide IndieAuth details behind disclosure details

* Break out migration into two steps because some people have been runing dev in production

* Add auth option to user dropdown

Co-authored-by: Aaron Parecki <aaron@parecki.com>

webroot/js/components/chat/chat-message-view.js

@@ -49,7 +49,8 @@ export default class ChatMessageView extends Component {
     if (!user) {
       return null;
     }
-    const { displayName, displayColor, createdAt, isBot } = user;
+
+    const { displayName, displayColor, createdAt, isBot, authenticated } = user;
     const isAuthorModerator = checkIsModerator(message);
 
     const isMessageModeratable =
@@ -78,7 +79,7 @@ export default class ChatMessageView extends Component {
           isMessageModeratable ? 'moderatable' : ''
         }`;
 
-    const messageAuthorFlair = isAuthorModerator
+    const isModeratorFlair = isAuthorModerator
       ? html`<img
           class="flair"
           title="Moderator"
@@ -95,6 +96,14 @@ export default class ChatMessageView extends Component {
         />`
       : null;
 
+    const authorAuthenticatedFlair = authenticated
+      ? html`<img
+          class="flair"
+          title="Authenticated"
+          src="/img/authenticated.svg"
+        />`
+      : null;
+
     return html`
       <div
         style=${backgroundStyle}
@@ -107,7 +116,8 @@ export default class ChatMessageView extends Component {
             class="message-author font-bold"
             title=${userMetadata}
           >
-            ${isBotFlair} ${messageAuthorFlair} ${displayName}
+            ${isBotFlair} ${authorAuthenticatedFlair} ${isModeratorFlair}
+            ${displayName}
           </div>
           ${isMessageModeratable &&
           html`<${ModeratorActions}