.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "factuges-document-signing-service"
-version = "0.1.1"
+version = "0.1.3"
 description = "FastAPI service for signing PDF documents using external secret managers"
 requires-python = ">=3.11"
 
@@ -14,7 +14,7 @@ dependencies = [
     "fastapi>=0.110",
     "uvicorn[standard]>=0.27",
 
-    "pyhanko>=0.25",
+    "pyhanko>=0.32",
     "cryptography>=42",
 
     # Infisical SDK for secret management

scripts/build-docker.sh

@@ -66,7 +66,7 @@ fi
 
 # --- Detectar nombre y versión de la API ---
 IMAGE_NAME=$(node -p "require('${PROJECT_DIR}/setup.cfg').name" 2>/dev/null || echo "factuges-document-signing-service")
-IMAGE_VERSION=$(node -p "require('${PROJECT_DIR}/setup.cfg').version" 2>/dev/null || echo "0.1.2")
+IMAGE_VERSION=$(node -p "require('${PROJECT_DIR}/setup.cfg').version" 2>/dev/null || echo "0.1.3")
 
 PORT="8000"  # valor por defecto
 

setup.cfg

@@ -1,7 +1,7 @@
 
 [metadata]
 name = "factuges-document-signing-service"
-version = "0.1.2"
+version = "0.1.3"
 description = "FastAPI service for signing PDF documents using external secret managers"
 author = Rodax Software
 author_email = info@rodax-software.com

src/signing_service/infrastructure/pdf/pyhanko_pdf_signer.py

@@ -1,11 +1,15 @@
 import base64
-from csv import writer
 import io
-from pydoc import doc
+from datetime import datetime, timezone
 
+from pyhanko import stamp
+from pyhanko.sign import fields, signers
 from pyhanko.sign import signers
+
+from pyhanko.pdf_utils import text
 from pyhanko.pdf_utils.incremental_writer import IncrementalPdfFileWriter
 
+
 from signing_service.domain.ports.pdf_signer import PDFSignerPort
 
 
@@ -19,6 +23,9 @@ class PyHankoPDFSigner(PDFSignerPort):
         # 1️⃣ Decodificar certificado
         pfx_bytes = base64.b64decode(certificate)
 
+        # 3️⃣ Preparar PDF en modo incremental
+        writer = IncrementalPdfFileWriter(io.BytesIO(pdf_bytes))
+
         # 2️⃣ Cargar clave y certificado
         signer = signers.SimpleSigner.load_pkcs12_data(
             pkcs12_bytes=pfx_bytes,
@@ -26,16 +33,45 @@ class PyHankoPDFSigner(PDFSignerPort):
             other_certs=[],
         )
 
-        # 3️⃣ Preparar PDF
-        input_pdf = IncrementalPdfFileWriter(io.BytesIO(pdf_bytes))
+        # 3️⃣ Extract certificate info (from signer)
+        cert = signer.signing_cert
+        subject = cert.subject.native.get('common_name', 'Desconocido')
 
+
+       
+         # 5️⃣ Define signature field position
+        fields.append_signature_field(
+            writer,
+            sig_field_spec=fields.SigFieldSpec(
+                sig_field_name="Signature1",
+                on_page=-1,
+                box=(380, 100, 560, 160),  # x, y, x+width, y+height                
+            )
+        )
+         
+
+        # 4️⃣ Signature metadata (panel de firmas)
+        meta = signers.PdfSignatureMetadata(
+            field_name="Signature1",            
+            name=subject,
+        )
+
+
+        pdf_signer = signers.PdfSigner(
+            meta, signer=signer, stamp_style=stamp.TextStampStyle(
+                stamp_text='Firmado digitalmente por: %(signer)s\nFecha: %(ts)s',                
+                text_box_style=text.TextBoxStyle(
+                    border_width=0,
+                    font_size=12
+                    #font=opentype.GlyphAccumulatorFactory('path to font police.ttf'),
+                ),
+                #background=images.PdfImage('path to img.jpg')
+            )
+        )  
+      
         # 4️⃣ Firmar
-        signed_pdf: io.BytesIO = await signers.async_sign_pdf(
-            input_pdf,
-            signers.PdfSignatureMetadata(
-                field_name="Signature1"
-            ),
-            signer=signer,
+        signed_pdf: io.BytesIO = await pdf_signer.async_sign_pdf(
+            writer,
         )
 
         # 5️⃣ Obtener PDF firmado