rename main folders

APG-API-Lib/src/org/thialfihar/android/apg/integration/ContentProviderHelper.java

@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2012 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2010-2011 K-9 Mail Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.thialfihar.android.apg.integration;
+
+import android.app.Activity;
+import android.content.ContentUris;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.widget.Toast;
+
+public class ContentProviderHelper {
+    public static final String AUTHORITY = Constants.APG_PACKAGE_NAME;
+
+    public static final Uri CONTENT_URI_PUBLIC_KEY_RING_BY_KEY_ID = Uri.parse("content://"
+            + AUTHORITY + "/key_rings/public/key_id/");
+    public static final Uri CONTENT_URI_PUBLIC_KEY_RING_BY_EMAILS = Uri.parse("content://"
+            + AUTHORITY + "/key_rings/public/emails/");
+
+    public static final Uri CONTENT_URI_SECRET_KEY_RING_BY_KEY_ID = Uri.parse("content://"
+            + AUTHORITY + "/key_rings/secret/key_id/");
+    public static final Uri CONTENT_URI_SECRET_KEY_RING_BY_EMAILS = Uri.parse("content://"
+            + AUTHORITY + "/key_rings/secret/emails/");
+
+    private Context activity;
+
+    public ContentProviderHelper(Activity activity) {
+        this.activity = activity;
+    }
+
+    /**
+     * Get secret key ids based on a given email.
+     * 
+     * @param context
+     * @param email
+     *            The email in question.
+     * @return key ids
+     */
+    public long[] getSecretKeyIdsFromEmail(String email) {
+        long ids[] = null;
+        try {
+            Uri contentUri = Uri.withAppendedPath(CONTENT_URI_SECRET_KEY_RING_BY_EMAILS, email);
+            Cursor c = activity.getContentResolver().query(contentUri,
+                    new String[] { "master_key_id" }, null, null, null);
+            if (c != null && c.getCount() > 0) {
+                ids = new long[c.getCount()];
+                while (c.moveToNext()) {
+                    ids[c.getPosition()] = c.getLong(0);
+                }
+            }
+
+            if (c != null) {
+                c.close();
+            }
+        } catch (SecurityException e) {
+            insufficientPermissions();
+        }
+
+        return ids;
+    }
+
+    /**
+     * Get public key ids based on a given email.
+     * 
+     * @param context
+     * @param email
+     *            The email in question.
+     * @return key ids
+     */
+    public long[] getPublicKeyIdsFromEmail(String email) {
+        long ids[] = null;
+        try {
+            Uri contentUri = Uri.withAppendedPath(CONTENT_URI_PUBLIC_KEY_RING_BY_EMAILS, email);
+            Cursor c = activity.getContentResolver().query(contentUri,
+                    new String[] { "master_key_id" }, null, null, null);
+            if (c != null && c.getCount() > 0) {
+                ids = new long[c.getCount()];
+                while (c.moveToNext()) {
+                    ids[c.getPosition()] = c.getLong(0);
+                }
+            }
+
+            if (c != null) {
+                c.close();
+            }
+        } catch (SecurityException e) {
+            insufficientPermissions();
+        }
+
+        return ids;
+    }
+
+    /**
+     * Find out if a given email has a secret key.
+     * 
+     * @param context
+     * @param email
+     *            The email in question.
+     * @return true if there is a secret key for this email.
+     */
+    public boolean hasSecretKeyForEmail(String email) {
+        try {
+            Uri contentUri = Uri.withAppendedPath(CONTENT_URI_SECRET_KEY_RING_BY_EMAILS, email);
+            Cursor c = activity.getContentResolver().query(contentUri,
+                    new String[] { "master_key_id" }, null, null, null);
+            if (c != null && c.getCount() > 0) {
+                c.close();
+                return true;
+            }
+            if (c != null) {
+                c.close();
+            }
+        } catch (SecurityException e) {
+            insufficientPermissions();
+        }
+        return false;
+    }
+
+    /**
+     * Find out if a given email has a public key.
+     * 
+     * @param context
+     * @param email
+     *            The email in question.
+     * @return true if there is a public key for this email.
+     */
+    public boolean hasPublicKeyForEmail(String email) {
+        try {
+            Uri contentUri = Uri.withAppendedPath(CONTENT_URI_PUBLIC_KEY_RING_BY_EMAILS, email);
+            Cursor c = activity.getContentResolver().query(contentUri,
+                    new String[] { "master_key_id" }, null, null, null);
+            if (c != null && c.getCount() > 0) {
+                c.close();
+                return true;
+            }
+            if (c != null) {
+                c.close();
+            }
+        } catch (SecurityException e) {
+            insufficientPermissions();
+        }
+        return false;
+    }
+
+    /**
+     * Get the user id based on the key id.
+     * 
+     * @param context
+     * @param keyId
+     * @return user id
+     */
+    public String getUserId(long keyId) {
+        String userId = null;
+        try {
+            Uri contentUri = ContentUris.withAppendedId(CONTENT_URI_SECRET_KEY_RING_BY_KEY_ID,
+                    keyId);
+            Cursor c = activity.getContentResolver().query(contentUri, new String[] { "user_id" },
+                    null, null, null);
+            if (c != null && c.moveToFirst()) {
+                userId = c.getString(0);
+            }
+
+            if (c != null) {
+                c.close();
+            }
+        } catch (SecurityException e) {
+            insufficientPermissions();
+        }
+
+        if (userId == null) {
+            userId = "unknown";
+        }
+        return userId;
+    }
+
+    private void insufficientPermissions() {
+        Toast.makeText(activity, "Permission to access APG Provider is missing!", Toast.LENGTH_LONG)
+                .show();
+    }
+}