interactive/signatures
Retrieve digital signature information.
Download Java Code Show Output Show Input PDF
import com.pdflib.pCOS;
import com.pdflib.pCOSException;
import com.pdflib.cookbook.pcos.pcos_cookbook_example;
/**
* Retrieve digital signature information.
* <p>
* Required software: pCOS interface 3 (pCOS 3.x, PDFlib+PDI/PPS 7.x, TET 2.2,
* PLOP 3.x) <br>
* Required data: PDF document
*
* @version $Id: signatures.java,v 1.6 2010/09/27 13:24:25 stm Exp $
*/
public class signatures extends pcos_cookbook_example {
/* This is where the data files are. Adjust as necessary. */
private final static String SEARCH_PATH = "../input";
public void example_code(pCOS p, String filename) throws pCOSException,
/* Open the PDF document */
int doc = p.open_document(filename, "");
if (doc == -1)
throw new Exception("Error: " + p.get_errmsg());
System.out.println("File name: " + p.pcos_get_string(doc, "filename"));
String objtype = p.pcos_get_string(doc, "type:/Root/Perms");
String objtype2 = p.pcos_get_string(doc,
"type:/Root/ViewerPreferences/Rights");
if (objtype.equals("dict") || objtype2.equals("dict")) {
System.out.println("Reader-enabled: yes\n");
}
int fieldcount = (int) p.pcos_get_number(doc, "length:fields");
int sigcount = 0;
for (int f = 0; f < fieldcount; f++) {
objtype = p.pcos_get_string(doc, "type:fields[" + f + "]/FT");
if (!objtype.equals("name"))
continue;
String res = p.pcos_get_string(doc, "fields[" + f + "]/FT");
if (!res.equals("Sig"))
continue;
sigcount++;
objtype = p.pcos_get_string(doc, "type:fields[" + f + "]/T");
if (!objtype.equals("string"))
continue;
/* invisible signatures have /Rect [0 0 0 0] */
boolean invisible = p.pcos_get_number(doc, "fields[" + f
+ "]/Rect[0]") == 0
&& p.pcos_get_number(doc, "fields[" + f + "]/Rect[1]") == 0
&& p.pcos_get_number(doc, "fields[" + f + "]/Rect[2]") == 0
&& p.pcos_get_number(doc, "fields[" + f + "]/Rect[3]") == 0;
System.out.print(invisible ? "Invisible" : "Visible");
res = p.pcos_get_string(doc, "fields[" + f + "]/fullname");
System.out.print(" signature field '" + res + "': ");
objtype = p.pcos_get_string(doc, "type:fields[" + f + "]/V");
if (objtype.equals("dict")) {
System.out.println("signed");
/* dump various pieces of relevant signature information */
res = p.pcos_get_string(doc, "fields[" + f + "]/V/Filter");
System.out.println("Filter: '" + res + "'");
objtype = p.pcos_get_string(doc, "type:fields[" + f
+ "]/V/Name");
if (objtype.equals("string")) {
res = p.pcos_get_string(doc, "fields[" + f + "]/V/Name");
System.out.println("Name: '" + res + "'");
}
objtype = p.pcos_get_string(doc, "type:fields[" + f
+ "]/V/Reason");
if (objtype.equals("string")) {
res = p.pcos_get_string(doc, "fields[" + f + "]/V/Reason");
System.out.println("Reason: '" + res + "'");
}
objtype = p.pcos_get_string(doc, "type:fields[" + f + "]/V/M");
if (objtype.equals("string")) {
res = p.pcos_get_string(doc, "fields[" + f + "]/V/M");
System.out.println("Time of signing: '" + res + "'");
}
/* a document may contain more than one signature */
System.out.println();
}
else {
System.out.println("unsigned");
}
}
if (sigcount == 0)
System.out.println("no signature fields");
p.close_document(doc);
}
public signatures(String[] argv, String readable_name, String search_path,
String full_rcs_file_name, String revision) {
super(argv, readable_name, search_path, full_rcs_file_name, revision);
}
public static void main(String argv[]) {
signatures example = new signatures(argv, "Digital signature",
SEARCH_PATH, "$RCSfile: signatures.java,v $", "$Revision: 1.6 $");
example.execute();
}
}