Encrypt and Decrypt Files

1//---------------------------------------------------------------------------------------
2// Copyright (c) 2001-2023 by Apryse Software Inc. All Rights Reserved.
3// Consult legal.txt regarding legal and license information.
4//---------------------------------------------------------------------------------------
5(exports => {
6  exports.runEncTest = () => {
7    const PDFNet = exports.Core.PDFNet;
8
9    const main = async () => {
10      console.log('Beginning Test');
11      let ret = 0;
12      // Relative path to the folder containing test files.
13      const inputUrl = '../TestFiles/';
14      let doc = null;
15      // Example 1:
16      // secure a PDF document with password protection and adjust permissions
17      try {
18        console.log('Running Sample 1');
19        doc = await PDFNet.PDFDoc.createFromURL(inputUrl + 'fish.pdf');
20        doc.initSecurityHandler();
21        doc.lock();
22        console.log('PDFNet and PDF document initialized and locked');
23
24        const performOperation = true; // optional parameter
25
26        // Perform some operation on the document. In this case we use low level SDF API
27        // to replace the content stream of the first page with contents of file 'my_stream.txt'
28        // Results in fish.pdf becoming a pair of feathers.
29        if (performOperation) {
30          console.log('Replacing the content stream, use Flate compression...');
31          // Get the page dictionary using the following path: trailer/Root/Pages/Kids/0
32          const pageTrailer = await doc.getTrailer();
33          const pageRoot = await pageTrailer.get('Root');
34          const pageRootValue = await pageRoot.value();
35          const pages = await pageRootValue.get('Pages');
36          const pagesVal = await pages.value();
37          const kids = await pagesVal.get('Kids');
38          const kidsVal = await kids.value();
39          const pageDict = await kidsVal.getAt(0);
40
41          const embedFile = await PDFNet.Filter.createURLFilter(inputUrl + 'my_stream.txt');
42          const mystm = await PDFNet.FilterReader.create(embedFile);
43
44          const emptyFilter = new PDFNet.Filter('0');
45          const flateEncode = await PDFNet.Filter.createFlateEncode(emptyFilter);
46
47          const indStream = await doc.createIndirectStreamFromFilter(mystm, flateEncode);
48          await pageDict.put('Contents', indStream);
49        }
50
51        // Encrypt the document
52        // Apply a new security handler with given security settings.
53        // In order to open saved PDF you will need a user password 'test'.
54        const newHandler = await PDFNet.SecurityHandler.createDefault();
55
56        // Set a new password required to open a document
57        newHandler.changeUserPasswordUString('test');
58        console.log("Setting password to 'test'");
59
60        // Set Permissions
61        newHandler.setPermission(PDFNet.SecurityHandler.Permission.e_print, false);
62        newHandler.setPermission(PDFNet.SecurityHandler.Permission.e_extract_content, true);
63
64        // Note: document takes the ownership of newHandler.
65        doc.setSecurityHandler(newHandler);
66
67        // Save the changes
68        console.log('Saving modified file...');
69
70        const docbuf = await doc.saveMemoryBuffer(PDFNet.SDFDoc.SaveOptions.e_linearized);
71        saveBufferAsPDFDoc(docbuf, 'secured.pdf');
72      } catch (err) {
73        console.log(err);
74        console.log(err.stack);
75        ret = 1;
76      }
77
78      // Example 2:
79      // Opens an encrypted PDF document and removes its security.
80      try {
81        console.log('Running Sample 2');
82        const securedDoc = doc;
83
84        if (!(await securedDoc.initSecurityHandler())) {
85          let success = false;
86          console.log("The password has been set to : 'test'");
87          const passwordsToTry = ['password', 'testy', 'test'];
88
89          for (let count = 0; count < passwordsToTry.length; count++) {
90            const candidate = passwordsToTry[count];
91            console.log("Trying password candidate: '" + candidate + "'");
92            if (await securedDoc.initStdSecurityHandlerUString(candidate)) {
93              success = true;
94              console.log('The password is correct');
95              break;
96            } else {
97              console.log('The password is incorrect.');
98            }
99          }
100          if (!success) {
101            console.log('Document authentication error...');
102            ret = 1;
103            return ret;
104          }
105        }
106        securedDoc.lock();
107
108        console.log('PDF document initialized and locked');
109        const hdlr = await securedDoc.getSecurityHandler();
110
111        console.log('Document Open Password: ' + (await hdlr.isUserPasswordRequired()));
112        console.log('Permissions Password: ' + (await hdlr.isMasterPasswordRequired()));
113        console.log('Permissions: ');
114        console.log("\tHas 'owner' permissions: " + (await hdlr.getPermission(PDFNet.SecurityHandler.Permission.e_owner)));
115
116        console.log('\tOpen and decrypt the document: ' + (await hdlr.getPermission(PDFNet.SecurityHandler.Permission.e_doc_open)));
117        console.log('\tAllow content extraction: ' + (await hdlr.getPermission(PDFNet.SecurityHandler.Permission.e_extract_content)));
118        console.log('\tAllow full document editing: ' + (await hdlr.getPermission(PDFNet.SecurityHandler.Permission.e_doc_modify)));
119        console.log('\tAllow printing: ' + (await hdlr.getPermission(PDFNet.SecurityHandler.Permission.e_print)));
120        console.log('\tAllow high resolution printing: ' + (await hdlr.getPermission(PDFNet.SecurityHandler.Permission.e_print_high)));
121        console.log('\tAllow annotation editing: ' + (await hdlr.getPermission(PDFNet.SecurityHandler.Permission.e_mod_annot)));
122        console.log('\tAllow form fill: ' + (await hdlr.getPermission(PDFNet.SecurityHandler.Permission.e_fill_forms)));
123        console.log('\tAllow content extraction for accessibility: ' + (await hdlr.getPermission(PDFNet.SecurityHandler.Permission.e_access_support)));
124        console.log('\tAllow document assembly: ' + (await hdlr.getPermission(PDFNet.SecurityHandler.Permission.e_assemble_doc)));
125
126        // remove all security on the document
127        securedDoc.removeSecurity();
128
129        const docbuf = await securedDoc.saveMemoryBuffer(PDFNet.SDFDoc.SaveOptions.e_linearized);
130        saveBufferAsPDFDoc(docbuf, 'not_secured.pdf');
131        console.log('done');
132      } catch (err) {
133        console.log(err.stack);
134        ret = 1;
135      }
136      return ret;
137    };
138
139    // add your own license key as the second parameter, e.g. PDFNet.runWithCleanup(main, 'YOUR_LICENSE_KEY')
140    PDFNet.runWithCleanup(main);
141  };
142})(window);
143// eslint-disable-next-line spaced-comment
144//# sourceURL=EncTest.js