feat: add direct templates links (#1165)

## Description

Direct templates links is a feature that provides template owners the
ability to allow users to create documents based of their templates.

## General outline

This works by allowing the template owner to configure a "direct
recipient" in the template.

When a user opens the direct link to the template, it will create a flow
where they sign the fields configured by the template owner for the
direct recipient. After these fields are signed the following will
occur:

- A document will be created where the owner is the template owner
- The direct recipient fields will be signed
- The document will be sent to any other recipients configured in the
template
- If there are none the document will be immediately completed

## Notes

There's a custom prisma migration to migrate all documents to have
'DOCUMENT' as the source, then sets the column to required.

---------

Co-authored-by: Lucas Smith <me@lucasjamessmith.me>

apps/web/src/app/(recipient)/d/[token]/page.tsx

@@ -0,0 +1,92 @@
+import { notFound, redirect } from 'next/navigation';
+
+import { UsersIcon } from 'lucide-react';
+import { match } from 'ts-pattern';
+
+import { getServerComponentSession } from '@documenso/lib/next-auth/get-server-component-session';
+import { getTemplateByDirectLinkToken } from '@documenso/lib/server-only/template/get-template-by-direct-link-token';
+import { DocumentAccessAuth } from '@documenso/lib/types/document-auth';
+import { extractDocumentAuthMethods } from '@documenso/lib/utils/document-auth';
+
+import { DocumentAuthProvider } from '~/app/(signing)/sign/[token]/document-auth-provider';
+import { SigningProvider } from '~/app/(signing)/sign/[token]/provider';
+import { truncateTitle } from '~/helpers/truncate-title';
+
+import { DirectTemplatePageView } from './direct-template';
+import { DirectTemplateAuthPageView } from './signing-auth-page';
+
+export type TemplatesDirectPageProps = {
+  params: {
+    token: string;
+  };
+};
+
+export default async function TemplatesDirectPage({ params }: TemplatesDirectPageProps) {
+  const { token } = params;
+
+  if (!token) {
+    redirect('/');
+  }
+
+  const { user } = await getServerComponentSession();
+
+  const template = await getTemplateByDirectLinkToken({
+    token,
+  }).catch(() => null);
+
+  if (!template || !template.directLink?.enabled) {
+    notFound();
+  }
+
+  const directTemplateRecipient = template.Recipient.find(
+    (recipient) => recipient.id === template.directLink?.directTemplateRecipientId,
+  );
+
+  if (!directTemplateRecipient) {
+    notFound();
+  }
+
+  const { derivedRecipientAccessAuth } = extractDocumentAuthMethods({
+    documentAuth: template.authOptions,
+  });
+
+  // Ensure typesafety when we add more options.
+  const isAccessAuthValid = match(derivedRecipientAccessAuth)
+    .with(DocumentAccessAuth.ACCOUNT, () => user !== null)
+    .with(null, () => true)
+    .exhaustive();
+
+  if (!isAccessAuthValid) {
+    return <DirectTemplateAuthPageView />;
+  }
+
+  return (
+    <SigningProvider email={user?.email} fullName={user?.name} signature={user?.signature}>
+      <DocumentAuthProvider
+        documentAuthOptions={template.authOptions}
+        recipient={directTemplateRecipient}
+        user={user}
+      >
+        <div className="mx-auto -mt-4 w-full max-w-screen-xl px-4 md:px-8">
+          <h1 className="mt-4 truncate text-2xl font-semibold md:text-3xl" title={template.title}>
+            {truncateTitle(template.title)}
+          </h1>
+
+          <div className="text-muted-foreground mb-8 mt-2.5 flex items-center gap-x-2">
+            <UsersIcon className="h-4 w-4" />
+            <p className="text-muted-foreground/80">
+              {template.Recipient.length}{' '}
+              {template.Recipient.length > 1 ? 'recipients' : 'recipient'}
+            </p>
+          </div>
+
+          <DirectTemplatePageView
+            directTemplateRecipient={directTemplateRecipient}
+            directTemplateToken={template.directLink.token}
+            template={template}
+          />
+        </div>
+      </DocumentAuthProvider>
+    </SigningProvider>
+  );
+}