feat: support embedded authoring for creation (#1741)

Adds support for creating documents and templates
using our embed components.

Support is super primitive at the moment and is being polished.

packages/trpc/server/embedding-router/get-embedding-document.ts

@@ -0,0 +1,63 @@
+import { AppError, AppErrorCode } from '@documenso/lib/errors/app-error';
+import { verifyEmbeddingPresignToken } from '@documenso/lib/server-only/embedding-presign/verify-embedding-presign-token';
+import { prisma } from '@documenso/prisma';
+
+import { procedure } from '../trpc';
+import {
+  ZGetEmbeddingDocumentRequestSchema,
+  ZGetEmbeddingDocumentResponseSchema,
+} from './get-embedding-document.types';
+
+export const getEmbeddingDocumentRoute = procedure
+  .input(ZGetEmbeddingDocumentRequestSchema)
+  .output(ZGetEmbeddingDocumentResponseSchema)
+  .query(async ({ input, ctx: { req } }) => {
+    try {
+      const authorizationHeader = req.headers.get('authorization');
+
+      const [presignToken] = (authorizationHeader || '')
+        .split('Bearer ')
+        .filter((s) => s.length > 0);
+
+      if (!presignToken) {
+        throw new AppError(AppErrorCode.UNAUTHORIZED, {
+          message: 'No presign token provided',
+        });
+      }
+
+      const apiToken = await verifyEmbeddingPresignToken({ token: presignToken });
+
+      const { documentId } = input;
+
+      const document = await prisma.document.findFirst({
+        where: {
+          id: documentId,
+          userId: apiToken.userId,
+          ...(apiToken.teamId ? { teamId: apiToken.teamId } : {}),
+        },
+        include: {
+          documentData: true,
+          recipients: true,
+          fields: true,
+        },
+      });
+
+      if (!document) {
+        throw new AppError(AppErrorCode.NOT_FOUND, {
+          message: 'Document not found',
+        });
+      }
+
+      return {
+        document,
+      };
+    } catch (error) {
+      if (error instanceof AppError) {
+        throw error;
+      }
+
+      throw new AppError(AppErrorCode.UNKNOWN_ERROR, {
+        message: 'Failed to get document',
+      });
+    }
+  });