Adding static meta data on signatures

back/app/contract/print/__init__.py

@@ -139,3 +139,18 @@ def retrieve_signature_png(filepath):
     base64_utf8_str = base64.b64encode(b_content).decode('utf-8')
     ext = filepath.split('.')[-1]
     return f'data:image/{ext};base64,{base64_utf8_str}'
+
+
+@print_router.get("/opengraph/{signature_id}", response_class=HTMLResponse)
+async def get_signature_opengraph(signature_id: str, request: Request) -> str:
+    contract = await Contract.find_by_signature_id(signature_id)
+    signature = contract.get_signature(signature_id)
+    template = templates.get_template("opengraph.html")
+
+    signatory = signature.representative.label if signature.representative else signature.entity.label
+
+    return template.render({
+        "signatory": signatory,
+        "title": contract.label,
+        "origin_url": f"{request.url.scheme}://{request.url.hostname}"
+    })