#727 - Fixed App error in PDF to images for password protected files (#…

…739)

app/src/main/java/swati4star/createpdf/fragment/PdfToImageFragment.java

@@ -10,6 +10,7 @@
 import android.support.design.widget.BottomSheetBehavior;
 import android.support.v4.app.Fragment;
 import android.support.v7.widget.RecyclerView;
+import android.text.InputType;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -41,8 +42,10 @@
 import swati4star.createpdf.util.ExtractImages;
 import swati4star.createpdf.util.FileUtils;
 import swati4star.createpdf.util.MorphButtonUtility;
+import swati4star.createpdf.util.PDFUtils;
 import swati4star.createpdf.util.PdfToImages;
 import swati4star.createpdf.util.RealPathUtil;
+import swati4star.createpdf.util.StringUtils;
 
 import static android.app.Activity.RESULT_OK;
 import static swati4star.createpdf.util.CommonCodeUtils.checkSheetBehaviourUtil;
@@ -51,6 +54,7 @@
 import static swati4star.createpdf.util.Constants.BUNDLE_DATA;
 import static swati4star.createpdf.util.Constants.PDF_TO_IMAGES;
 import static swati4star.createpdf.util.DialogUtils.createAnimationDialog;
+import static swati4star.createpdf.util.DialogUtils.createOverwriteDialog;
 import static swati4star.createpdf.util.StringUtils.showSnackbar;
 
 public class PdfToImageFragment extends Fragment implements BottomSheetPopulate, MergeFilesAdapter.OnClickListener,
@@ -67,6 +71,9 @@ public class PdfToImageFragment extends Fragment implements BottomSheetPopulate,
     private ArrayList<String> mOutputFilePaths;
     private MaterialDialog mMaterialDialog;
     private String mOperation;
+    private Context mContext;
+    private PDFUtils mPDFUtils;
+    private String[] mInputPassword;
 
     @BindView(R.id.lottie_progress)
     LottieAnimationView mLottieProgress;
@@ -177,13 +184,45 @@ public void onActivityResult(int requestCode, int resultCode, Intent data) throw
     }
 
     /**
-     * invokes generation of images for pdf pages in the background
+     * invokes generation of images for pdf pages in the background by checking
+     * for encryption first.
      */
     @OnClick(R.id.createImages)
     public void parse() {
-        if (mOperation.equals(PDF_TO_IMAGES))
-            new PdfToImages(mPath, mUri, this).execute();
-        else
+        if (mPDFUtils.isPDFEncrypted(mPath)) {
+            mInputPassword = new String[1];
+            new MaterialDialog.Builder(mActivity)
+                    .title(R.string.enter_password)
+                    .content(R.string.decrypt_protected_file)
+                    .inputType(InputType.TYPE_TEXT_VARIATION_PASSWORD)
+                    .input(null, null, (dialog, input) -> {
+                        if (StringUtils.isEmpty(input)) {
+                            showSnackbar(mActivity, R.string.snackbar_name_not_blank);
+                        } else {
+                            final String inputName = input.toString();
+                            if (inputName != null) {
+                                mInputPassword[0] = inputName;
+                                pdfToImage(mInputPassword);
+                            }
+                        }
+                    })
+                    .show();
+        } else {
+            pdfToImage(mInputPassword);
+        }
+    }
+
+    /**
+     * Thia method handles the call to the Async process of conversion
+     * from PDF to Image.
+     *
+     * @param mInputPassword - the password if the file is encrypted.
+     */
+    private void pdfToImage(String[] mInputPassword) {
+        if (mOperation.equals(PDF_TO_IMAGES)) {
+            new PdfToImages(mContext, mInputPassword, mPath, mUri, this)
+                    .execute();
+        } else
             new ExtractImages(mPath, this).execute();
     }
 
@@ -194,6 +233,8 @@ public void onAttach(Context context) {
         mMorphButtonUtility = new MorphButtonUtility(mActivity);
         mFileUtils = new FileUtils(mActivity);
         mBottomSheetUtils = new BottomSheetUtils(mActivity);
+        mContext = context;
+        mPDFUtils = new PDFUtils(mActivity);
     }
 
     /**

app/src/main/java/swati4star/createpdf/util/PDFEncryptionUtility.java

@@ -191,6 +191,36 @@ public void afterTextChanged(Editable input) {
         });
     }
 
+    /**
+     * This function removes the password for encrypted files.
+     * @param file - the path of the actual encrypted file.
+     * @param inputPassword - the password of the encrypted file.
+     * @return
+     */
+    public String removeDefPasswordForImages(final String file,
+                                             final String[] inputPassword) {
+        String finalOutputFile;
+        try {
+            String masterpwd = mSharedPrefs.getString(MASTER_PWD_STRING, appName);
+            PdfReader reader = new PdfReader(file, masterpwd.getBytes());
+            byte[] password;
+            finalOutputFile = mFileUtils.getUniqueFileName
+                    (file.replace(mContext.getResources().getString(R.string.pdf_ext),
+                            mContext.getString(R.string.decrypted_file)));
+            password = reader.computeUserPassword();
+            byte[] input = inputPassword[0].getBytes();
+            if (Arrays.equals(input, password)) {
+                PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(finalOutputFile));
+                stamper.close();
+                reader.close();
+                return finalOutputFile;
+            }
+        } catch (DocumentException | IOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
     private boolean removePasswordUsingDefMasterPAssword(final String file,
                                                          final DataSetChanged dataSetChanged,
                                                          final String[] inputPassword) {

app/src/main/java/swati4star/createpdf/util/PdfToImages.java

@@ -1,5 +1,7 @@
 package swati4star.createpdf.util;
 
+import android.app.Activity;
+import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Color;
@@ -26,35 +28,51 @@ public class PdfToImages extends AsyncTask<Void, Void, Void> {
     private ExtractImagesListener mExtractImagesListener;
     private int mImagesCount = 0;
     private ArrayList<String> mOutputFilePaths;
+    private String[] mPassword;
+    private PDFEncryptionUtility mPDFEncryptionUtility;
+    private Context mContext;
+    private String mDecryptedPath;
 
-    public PdfToImages(String mPath, Uri mUri, ExtractImagesListener mExtractImagesListener) {
+    public PdfToImages(Context context, String[] password, String mPath, Uri mUri,
+                       ExtractImagesListener mExtractImagesListener) {
         this.mPath = mPath;
         this.mUri = mUri;
         this.mExtractImagesListener = mExtractImagesListener;
         mOutputFilePaths = new ArrayList<>();
+        this.mPassword = password;
+        this.mContext = context;
     }
 
     @Override
     protected void onPreExecute() {
         super.onPreExecute();
+        mPDFEncryptionUtility = new PDFEncryptionUtility((Activity) mContext);
         mExtractImagesListener.extractionStarted();
     }
 
     @Override
     protected Void doInBackground(Void... voids) {
+        if (mPassword != null) {
+            mDecryptedPath = mPDFEncryptionUtility.removeDefPasswordForImages(mPath, mPassword);
+        }
         mOutputFilePaths = new ArrayList<>();
         mImagesCount = 0;
 
         // Render pdf pages as bitmap
         ParcelFileDescriptor fileDescriptor = null;
         try {
-            if (mUri != null)
-                // resolve pdf file path based on uri
-                fileDescriptor = ((PdfToImageFragment) mExtractImagesListener).getContext()
-                        .getContentResolver().openFileDescriptor(mUri, "r");
-            else if (mPath != null)
-                // resolve pdf file path based on relative path
-                fileDescriptor = ParcelFileDescriptor.open(new File(mPath), MODE_READ_ONLY);
+            if (mDecryptedPath != null)
+                fileDescriptor = ParcelFileDescriptor.open(new File(mDecryptedPath), MODE_READ_ONLY);
+            else {
+                if (mUri != null) {
+                    // resolve pdf file path based on uri
+                    fileDescriptor = ((PdfToImageFragment) mExtractImagesListener).getContext()
+                            .getContentResolver().openFileDescriptor(mUri, "r");
+                } else if (mPath != null) {
+                    // resolve pdf file path based on relative path
+                    fileDescriptor = ParcelFileDescriptor.open(new File(mPath), MODE_READ_ONLY);
+                }
+            }
             if (fileDescriptor != null) {
                 PdfRenderer renderer = new PdfRenderer(fileDescriptor);
                 final int pageCount = renderer.getPageCount();
@@ -88,14 +106,14 @@ else if (mPath != null)
         } catch (IOException | SecurityException e) {
             e.printStackTrace();
         }
-
-
         return null;
     }
 
     @Override
     protected void onPostExecute(Void aVoid) {
         super.onPostExecute(aVoid);
         mExtractImagesListener.updateView(mImagesCount, mOutputFilePaths);
+        if (mDecryptedPath != null)
+            new File(mDecryptedPath).delete();
     }
 }

app/src/main/res/values-es/strings.xml

@@ -241,6 +241,7 @@
     <string name="extract_text">Extract Text</string>
     <string name="snackbar_txtExtracted">Text extracted!</string>
     <string name="snackbar_pdfselected">PDF file selected!</string>
+    <string name="decrypt_protected_file">Selected pdf is password protected. Enter the password to continue...</string>
     <string name="creating_txt">Creating Text File</string>
     <string name="filter_brush">Pincel</string>
     <string name="filter_saved">Imagen guardada</string>

app/src/main/res/values-fr/strings.xml

@@ -405,6 +405,7 @@
     <string name="pdf_selected">PDF file selected: </string>
     <string name="snackbar_txtExtracted">Text extracted!</string>
     <string name="snackbar_pdfselected">PDF file selected!</string>
+    <string name="decrypt_protected_file">Selected pdf is password protected. Enter the password to continue...</string>
     <string name="creating_txt">Creating Text File</string>
 
     <string name="font_color">Font Color</string>

app/src/main/res/values-ja/strings.xml

@@ -403,6 +403,7 @@
     <string name="pdf_selected">PDF file selected: </string>
     <string name="snackbar_txtExtracted">Text extracted!</string>
     <string name="snackbar_pdfselected">PDF file selected!</string>
+    <string name="decrypt_protected_file">Selected pdf is password protected. Enter the password to continue...</string>
     <string name="creating_txt">Creating Text File</string>
 
     <string name="font_color">Font Color</string>

app/src/main/res/values-ru/strings.xml

@@ -446,6 +446,7 @@
     <string name="pdf_selected">PDF file selected: </string>
     <string name="snackbar_txtExtracted">Text extracted!</string>
     <string name="snackbar_pdfselected">PDF file selected!</string>
+    <string name="decrypt_protected_file">Selected pdf is password protected. Enter the password to continue...</string>
     <string name="creating_txt">Creating Text File</string>
 
     <string name="font_color">Font Color</string>

app/src/main/res/values/strings.xml

@@ -200,6 +200,7 @@
     <string name="set_as_default">Set as default</string>
     <string name="decrypted_file">_unencrypted.pdf</string>
     <string name="decrypt_message">Enter the password to continue</string>
+    <string name="decrypt_protected_file">Selected pdf is password protected. Enter the password to continue...</string>
     <string name="not_encrypted">PDF is not Encrypted</string>
     <string name="save_current">Save</string>
     <string name="save">Save</string>