feat: render signatures on pending envelopes (#2743)

packages/lib/client-only/providers/envelope-render-provider.tsx

@@ -11,6 +11,18 @@ import { getRecipientColor } from '@documenso/ui/lib/recipient-colors';
 import type { TEnvelope } from '../../types/envelope';
 import type { FieldRenderMode } from '../../universal/field-renderer/render-field';
 
+/**
+ * The signature data for an inserted signature field.
+ *
+ * Loaded separately from the envelope to avoid bloating the envelope.get response
+ * with potentially large base64 image payloads.
+ */
+export type EnvelopeRenderFieldSignature = {
+  fieldId: number;
+  signatureImageAsBase64: string | null;
+  typedSignature: string | null;
+};
+
 export type PageRenderData = {
   scale: number;
   pageIndex: number;
@@ -50,6 +62,7 @@ type EnvelopeRenderProviderValue = {
   currentEnvelopeItem: EnvelopeRenderItem | null;
   setCurrentEnvelopeItem: (envelopeItemId: string) => void;
   fields: Field[];
+  signatures: EnvelopeRenderFieldSignature[];
   recipients: Pick<Recipient, 'id' | 'name' | 'email' | 'signingStatus'>[];
   getRecipientColorKey: (recipientId: number) => TRecipientColor;
 
@@ -89,6 +102,15 @@ interface EnvelopeRenderProviderProps {
    */
   fields?: Field[];
 
+  /**
+   * Optional inserted signature data for signature fields.
+   *
+   * Fetched separately from the envelope to keep the envelope response lean.
+   * If a signature field has no entry here, the renderer will fall back to
+   * showing the field type placeholder.
+   */
+  signatures?: EnvelopeRenderFieldSignature[];
+
   /**
    * Optional recipient used to determine the color of the fields and hover
    * previews.
@@ -137,6 +159,7 @@ export const EnvelopeRenderProvider = ({
   envelope,
   envelopeItems: envelopeItemsFromProps,
   fields,
+  signatures,
   token,
   presignToken,
   recipients = [],
@@ -212,6 +235,7 @@ export const EnvelopeRenderProvider = ({
         currentEnvelopeItem: currentItem,
         setCurrentEnvelopeItem,
         fields: fields ?? [],
+        signatures: signatures ?? [],
         recipients,
         getRecipientColorKey,
         renderError,

packages/lib/universal/field-renderer/render-signature-field.ts

@@ -40,6 +40,52 @@ const getImageDimensions = (img: HTMLImageElement, fieldWidth: number, fieldHeig
   };
 };
 
+/**
+ * Build a Konva.Image for a base64 signature, sized to fit within the given
+ * field dimensions. Works in both browser and Node.js (via skia-canvas).
+ */
+const createSignatureImage = (
+  signatureImageAsBase64: string,
+  fieldWidth: number,
+  fieldHeight: number,
+): Konva.Image => {
+  if (typeof window !== 'undefined') {
+    const img = new Image();
+
+    const image = new Konva.Image({
+      image: img,
+      x: 0,
+      y: 0,
+      width: fieldWidth,
+      height: fieldHeight,
+    });
+
+    img.onload = () => {
+      image.setAttrs({
+        image: img,
+        ...getImageDimensions(img, fieldWidth, fieldHeight),
+      });
+    };
+
+    img.src = signatureImageAsBase64;
+
+    return image;
+  }
+
+  // Node.js with skia-canvas
+  if (!SkiaImage) {
+    throw new Error('Skia image not found');
+  }
+
+  // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
+  const img = new SkiaImage(signatureImageAsBase64) as unknown as HTMLImageElement;
+
+  return new Konva.Image({
+    image: img,
+    ...getImageDimensions(img, fieldWidth, fieldHeight),
+  });
+};
+
 const createFieldSignature = (
   field: FieldToRender,
   options: RenderFieldElementOptions,
@@ -67,6 +113,16 @@ const createFieldSignature = (
   // Handle edit mode.
   if (mode === 'edit') {
     textToRender = fieldTypeName;
+
+    // If the field has already been signed and we have the signature data
+    // available, render it. Otherwise leave the field type label as a placeholder.
+    if (field.inserted && signature?.typedSignature) {
+      textToRender = signature.typedSignature;
+    }
+
+    if (field.inserted && signature?.signatureImageAsBase64) {
+      return createSignatureImage(signature.signatureImageAsBase64, fieldWidth, fieldHeight);
+    }
   }
 
   // Handle sign mode.
@@ -82,44 +138,7 @@ const createFieldSignature = (
     }
 
     if (signature?.signatureImageAsBase64) {
-      if (typeof window !== 'undefined') {
-        // Create a new HTML Image element
-        const img = new Image();
-
-        const image = new Konva.Image({
-          image: img,
-          x: 0,
-          y: 0,
-          width: fieldWidth,
-          height: fieldHeight,
-        });
-
-        img.onload = () => {
-          image.setAttrs({
-            image: img,
-            ...getImageDimensions(img, fieldWidth, fieldHeight),
-          });
-        };
-
-        img.src = signature.signatureImageAsBase64;
-
-        return image;
-      } else {
-        // Node.js with skia-canvas
-        if (!SkiaImage) {
-          throw new Error('Skia image not found');
-        }
-
-        // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
-        const img = new SkiaImage(signature?.signatureImageAsBase64) as unknown as HTMLImageElement;
-
-        const image = new Konva.Image({
-          image: img,
-          ...getImageDimensions(img, fieldWidth, fieldHeight),
-        });
-
-        return image;
-      }
+      return createSignatureImage(signature.signatureImageAsBase64, fieldWidth, fieldHeight);
     }
   }
 

packages/trpc/server/envelope-router/envelope-fields/get-envelope-field-signatures.ts

@@ -0,0 +1,65 @@
+import { FieldType } from '@prisma/client';
+
+import { AppError, AppErrorCode } from '@documenso/lib/errors/app-error';
+import { getEnvelopeWhereInput } from '@documenso/lib/server-only/envelope/get-envelope-by-id';
+import { prisma } from '@documenso/prisma';
+
+import { authenticatedProcedure } from '../../trpc';
+import {
+  ZGetEnvelopeFieldSignaturesRequestSchema,
+  ZGetEnvelopeFieldSignaturesResponseSchema,
+} from './get-envelope-field-signatures.types';
+
+export const getEnvelopeFieldSignaturesRoute = authenticatedProcedure
+  .input(ZGetEnvelopeFieldSignaturesRequestSchema)
+  .output(ZGetEnvelopeFieldSignaturesResponseSchema)
+  .query(async ({ input, ctx }) => {
+    const { teamId, user } = ctx;
+    const { envelopeId } = input;
+
+    ctx.logger.info({
+      input: {
+        envelopeId,
+      },
+    });
+
+    // Validate the user has access to the envelope.
+    const { envelopeWhereInput } = await getEnvelopeWhereInput({
+      id: {
+        type: 'envelopeId',
+        id: envelopeId,
+      },
+      type: null,
+      userId: user.id,
+      teamId,
+    });
+
+    const envelope = await prisma.envelope.findFirst({
+      where: envelopeWhereInput,
+      include: {
+        fields: {
+          where: {
+            inserted: true,
+            type: FieldType.SIGNATURE,
+          },
+          include: {
+            signature: true,
+          },
+        },
+      },
+    });
+
+    if (!envelope) {
+      throw new AppError(AppErrorCode.NOT_FOUND, {
+        message: 'Envelope not found',
+      });
+    }
+
+    const signatures = envelope.fields.map((field) => ({
+      fieldId: field.id,
+      signatureImageAsBase64: field.signature?.signatureImageAsBase64 ?? null,
+      typedSignature: field.signature?.typedSignature ?? null,
+    }));
+
+    return signatures;
+  });

packages/trpc/server/envelope-router/envelope-fields/get-envelope-field-signatures.types.ts

@@ -0,0 +1,20 @@
+import { z } from 'zod';
+
+export const ZGetEnvelopeFieldSignaturesRequestSchema = z.object({
+  envelopeId: z.string().min(1),
+});
+
+export const ZGetEnvelopeFieldSignaturesResponseSchema = z
+  .object({
+    fieldId: z.number(),
+    signatureImageAsBase64: z.string().nullable(),
+    typedSignature: z.string().nullable(),
+  })
+  .array();
+
+export type TGetEnvelopeFieldSignaturesRequest = z.infer<
+  typeof ZGetEnvelopeFieldSignaturesRequestSchema
+>;
+export type TGetEnvelopeFieldSignaturesResponse = z.infer<
+  typeof ZGetEnvelopeFieldSignaturesResponseSchema
+>;

packages/trpc/server/envelope-router/router.ts

@@ -15,6 +15,7 @@ import { duplicateEnvelopeRoute } from './duplicate-envelope';
 import { createEnvelopeFieldsRoute } from './envelope-fields/create-envelope-fields';
 import { deleteEnvelopeFieldRoute } from './envelope-fields/delete-envelope-field';
 import { getEnvelopeFieldRoute } from './envelope-fields/get-envelope-field';
+import { getEnvelopeFieldSignaturesRoute } from './envelope-fields/get-envelope-field-signatures';
 import { updateEnvelopeFieldsRoute } from './envelope-fields/update-envelope-fields';
 import { createEnvelopeRecipientsRoute } from './envelope-recipients/create-envelope-recipients';
 import { deleteEnvelopeRecipientRoute } from './envelope-recipients/delete-envelope-recipient';
@@ -68,6 +69,7 @@ export const envelopeRouter = router({
   },
   field: {
     get: getEnvelopeFieldRoute,
+    getSignatures: getEnvelopeFieldSignaturesRoute,
     createMany: createEnvelopeFieldsRoute,
     updateMany: updateEnvelopeFieldsRoute,
     delete: deleteEnvelopeFieldRoute,