eSign PDF with Metadata signature Leave feedback
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GroupDocs.Signature provides PdfMetadataSignature class to specify different Metadata signature objects for MetadataSignOptions instance.
PDF document metadata is hidden attributes, some of them are visible only over viewing standard document properties like Author, Creation Date, Producer, Entry, Keywords etc.
PDF document metadata contains 3 fields: Name, Value and TagPrefix, combination of Name and Tag prefix should be unique.
PDF document metadata could keep big amount of data that provides ability to keep serialized custom objects with additional encryption in there.
- Create new instance of Signature class and pass source document path as a constructor parameter.
- Instantiate the MetadataSignOptions object according to your requirements.
- Instantiate one or several PdfMetadataSignature objects and add them into MetadataSignOptions to metadata signatures collection (Signatures) via Add or AddRange method.
- Call Sign method of Signature class instance and pass MetadataSignOptions to it.
This example shows how to sign PDF document with several e-signatures as metadata.
import groupdocs.signature as signature
from groupdocs.signature.options import MetadataSignOptions
from groupdocs.signature.domain import PdfMetadataSignature
from datetime import datetime
# Initialize signature
with signature.Signature("sample.pdf") as sign:
# Create metadata options
options = MetadataSignOptions()
# Add metadata signatures
options.add(PdfMetadataSignature("Author", "Mr.Scherlock Holmes")) # String value
options.add(PdfMetadataSignature("CreatedOn", datetime.now())) # DateTime values
options.add(PdfMetadataSignature("DocumentId", 123456)) # Integer value
options.add(PdfMetadataSignature("SignatureId", 123.456)) # Double value
options.add(PdfMetadataSignature("Amount", 123.456)) # Decimal value
options.add(PdfMetadataSignature("Total", 123.456)) # Float value
# Sign document
sign.sign("SampleSigned.pdf", options)
This example shows how to sign PDF document with standard embedded PDF document metadata signatures. If PDF metadata signature already exists with same name its value will be overwritten.
import groupdocs.signature as signature
from groupdocs.signature.options import MetadataSignOptions
from groupdocs.signature.domain import PdfMetadataSignature, PdfMetadataSignatures
from datetime import datetime, timedelta
# Initialize signature
with signature.Signature("sample.pdf") as sign:
# Create metadata options
options = MetadataSignOptions()
# Using standard Pdf Metadata Signatures with new values
signatures = [
PdfMetadataSignatures.AUTHOR.clone("Mr.Scherlock Holmes"),
PdfMetadataSignatures.CREATE_DATE.clone(datetime.now() - timedelta(days=1)),
PdfMetadataSignatures.METADATA_DATE.clone(datetime.now() - timedelta(days=2)),
PdfMetadataSignatures.CREATOR_TOOL.clone("GD.Signature-Test"),
PdfMetadataSignatures.MODIFY_DATE.clone(datetime.now() - timedelta(days=13)),
PdfMetadataSignatures.PRODUCER.clone("GroupDocs-Producer"),
PdfMetadataSignatures.ENTRY.clone("Signature"),
PdfMetadataSignatures.KEYWORDS.clone("GroupDocs, Signature, Metadata, Creation Tool"),
PdfMetadataSignatures.TITLE.clone("Metadata Example"),
PdfMetadataSignatures.SUBJECT.clone("Metadata Test Example"),
PdfMetadataSignatures.DESCRIPTION.clone("Metadata Test example description"),
PdfMetadataSignatures.CREATOR.clone("GroupDocs.Signature")
]
# Add signatures to options
options.signatures.extend(signatures)
# Sign document
sign.sign("sample_signed.pdf", options)
You may easily run the code above and see the feature in action in our GitHub examples:
Along with the full-featured Python library, we provide simple but powerful free online apps.
To sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.
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