Public File Sharing (#72)

* Public File Sharing

This implements public file sharing (read-only) with and without passwords (#57).

It also fixes a problem with filenames including special characters like `#` not working properly (#71).

You can share a directory or a single file, by using the new share icon on the right of the directories/files, and click on it to manage an existing file share (setting a new password, or deleting the file share).

There is some other minor cleanup and other copy updates in the README.

Closes #57
Fixes #71

* Hide UI elements when sharing isn't allowed

routes/api/files/get-share.tsx

@@ -0,0 +1,46 @@
+import { Handlers } from 'fresh/server.ts';
+
+import { FileShare, FreshContextState } from '/lib/types.ts';
+import { FileShareModel } from '/lib/models/files.ts';
+import { AppConfig } from '/lib/config.ts';
+
+interface Data {}
+
+export interface RequestBody {
+  fileShareId: string;
+}
+
+export interface ResponseBody {
+  success: boolean;
+  fileShare: FileShare;
+}
+
+export const handler: Handlers<Data, FreshContextState> = {
+  async POST(request, context) {
+    if (!context.state.user) {
+      return new Response('Unauthorized', { status: 401 });
+    }
+
+    const isPublicFileSharingAllowed = await AppConfig.isPublicFileSharingAllowed();
+
+    if (!isPublicFileSharingAllowed) {
+      return new Response('Forbidden', { status: 403 });
+    }
+
+    const requestBody = await request.clone().json() as RequestBody;
+
+    if (!requestBody.fileShareId) {
+      return new Response('Bad Request', { status: 400 });
+    }
+
+    const fileShare = await FileShareModel.getById(requestBody.fileShareId);
+
+    if (!fileShare || fileShare.user_id !== context.state.user.id) {
+      return new Response('Not Found', { status: 404 });
+    }
+
+    const responseBody: ResponseBody = { success: true, fileShare };
+
+    return new Response(JSON.stringify(responseBody));
+  },
+};