Data stored in an app item’s signature

Use methods in EntitySignItem. The method generates a file from the signed app item attributes. It returns the values of the signed attributes as a file. The example shows how to extract all attribute signatures of an app item:

// The signature's ID is stored in the context  
const signId = Context.data.signId; 
if (!signId) { 
    throw new Error( 'Signature ID not found'); 
} 
// Search for the signature by ID 
const sign  = await System.signs.entitySigns.search().where(q => q.__id.eq(signId)). first(); 
if(!sign) { 
    throw new Error('Signature not found'); 
} 
//  Signature files request 
const awaitSigns = sign.signs.map(signData =>  signData.createAttributesFile()); 
// Wait for the requests to finish  
Context.data.signFiles = await Promise.all(awaitSigns); 

Use methods in EntitySignItem. The method generates a file with a signature. It is used to get a signature’s body as a file. The example shows how to extract all file signatures of an app item:

//  The signature's ID is stored in the context  
const signId = Context.data. signId; 
if (!signId) { 
    throw new Error('Signature ID not found'); 
}  
// Search for the signature by ID 
const sign = await System.signs. entitySigns.search().where(q => q.__id.eq(signId)).first(); 
if(!sign) {  
    throw new Error('Signature not found'); 
} 
// Request signature files  
const awaitSigns = sign.signs.map(signData => signData.createSignFile());  
// Wait for the requests to finish 
Context.data.signFiles = await Promise. all(awaitSigns); 

Use methods in EntitySignItem. This method returns detailed information about the signature and the public key that was used to create it. The following information is extracted from the public key: attributes of the issuer and the owner, validity dates, and the public key’s name and serial number. The attributes are named according to RFC 2253, however, attributes that are not among standard CertNames fields are not encoded as hex. In the example, detailed information about a signature is extracted to save the certificate’s serial number to the process context:

// The  signature’s ID is stored in the context 
const signId = Context.data.signId;  
if (!signId) { 
    throw new Error('Signature ID not found'); 
} 
//  Search for the signature by ID 
const sign = await System.signs.entitySigns. search().where(q => q.__id.eq(signId)).first(); 
if(!sign) { 
    throw new  Error('Signature not found'); 
} 
// Extracting the most recent signature  from the history 
const lastSign = sign.signs[0]; 
if (!lastSign) { 
     throw new Error('Signature needed to extract the data'); 
} 
// Extract the  detailed information 
const signDetails = await lastSign.getDetails(); 
//  Save the serial number of the certificate to the context  
Context.data.certificateId = signDetails.certSerialNumber;