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(PHP Extension) PDF Signature Page LocationSee more PDF Signatures ExamplesThis example demonstrates how to specify the location of a PDF signature on a page. Note: This example requires Chilkat v9.5.0.85 or greater.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. $pdf = new CkPdf(); // Load a PDF to be signed. // The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf $success = $pdf->LoadFile('qa_data/pdf/hello.pdf'); if ($success == false) { print $pdf->lastErrorText() . "\n"; exit; } // Options for signing are specified in JSON. $json = new CkJsonObject(); // In most cases, the signingCertificateV2 and signingTime attributes are required. $json->UpdateInt('signingCertificateV2',1); $json->UpdateInt('signingTime',1); // When cryptographically signing a PDF, the signature's appearance can be placed on a specific // page in the PDF document, and at a specified location on the page. // The 1st page of the PDF document is page number 1 (we don't use 0-based numbering for PDF page numbers). // The PDF object has a NumPages property, so we can use it to sign on the last page of the PDF. $json->UpdateInt('page',$pdf->get_NumPages()); // appearance.y and appearance.x JSON properties control the x,y location of the signature. // The "appearance.y" can be "top" or "bottom". // The "appearance.x" can be "left", "middle", or "right". // It is also possible to specify exact PDF location in user space coordinates, which is discussed below. $json->UpdateString('appearance.y','bottom'); $json->UpdateString('appearance.x','middle'); // In this example, the fontScale (in combination with the number of appearance text lines and the length of the longest text line), // automatically determine the width/height of the signature text box. Any included graphic (JPG image or built-in SVG) is automatically // scaled to fit. It is alternatively possible to specify the desired width/height of the signature rectangle. In that case // you would NOT specify a fontScale because Chilkat would automatically chose a font scale to fit the text to the desired rectangle. // This example demonstrates how to specify the exact width/height of the PDF signature text box. $json->UpdateString('appearance.fontScale','9.0'); $json->UpdateString('appearance.text[0]','Digitally signed by: cert_cn'); $json->UpdateString('appearance.text[1]','current_dt'); $json->UpdateString('appearance.image','document-accepted'); $json->UpdateString('appearance.imagePlacement','left'); $json->UpdateString('appearance.imageOpacity','100'); // Load the signing certificate. (Use your own certificate.) $cert = new CkCert(); $success = $cert->LoadPfxFile('qa_data/pfx/myPdfSigningCert.pfx','pfx_password'); if ($success == false) { print $cert->lastErrorText() . "\n"; exit; } // Tell the pdf object to use the certificate for signing. $success = $pdf->SetSigningCert($cert); if ($success == false) { print $pdf->lastErrorText() . "\n"; exit; } $success = $pdf->SignPdf($json,'qa_output/hello_signed.pdf'); if ($success == false) { print $pdf->lastErrorText() . "\n"; exit; } print 'The PDF has been successfully cryptographically signed.' . "\n"; // The appearance of the signature appears in Adobe Acrobat as shown here: // ---------------------------------------------------------------------------------------------------- // *** Scroll down for information about specifying the PDF signature x,y location in user space coordinates. // ---------------------------------------------------------------------------------------------------- // The x,y coordinates of a PDF page are in "user space", called "points", and there are 72 pointes per inch. // A PDF page (8.5" x 11") is 612 points wide and 792 points high. // The bottom left is at 0,0. The top right is at 612,792. // // To specify the location of a signature rectangle, the "appearance.y" is the y coordinate of the top of the signature rectangle, // and the "appearance.x" is the x coordinate of the left of the signature rectangle. // Therefore, to position the signature rectangle at the exact top/left of the page, we do this: $json->UpdateString('appearance.y','792'); $json->UpdateString('appearance.x','0'); $json->UpdateString('appearance.text[0]','Digitally signed again by: cert_cn'); $json->UpdateString('appearance.text[1]','current_dt'); $json->UpdateString('appearance.image','document-accepted'); $json->UpdateString('appearance.imagePlacement','right'); $pdf2 = new CkPdf(); $success = $pdf2->LoadFile('qa_output/hello_signed.pdf'); $success = $pdf2->SetSigningCert($cert); $success = $pdf2->SignPdf($json,'qa_output/hello_signed2.pdf'); if ($success == false) { print $pdf2->lastErrorText() . "\n"; exit; } print 'The PDF has been successfully cryptographically signed again.' . "\n"; // Here we have the PDF with the signature just added at the exact top/left. ?> |
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