Tagging plugins for 0.8-betav0.8-beta

1 files changed, 336 insertions, 0 deletions

diff --git a/plugins/enigma/lib/Crypt/GPG/DecryptStatusHandler.php b/plugins/enigma/lib/Crypt/GPG/DecryptStatusHandler.php
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+++ b/plugins/enigma/lib/Crypt/GPG/DecryptStatusHandler.php
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+<?php
+
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Crypt_GPG is a package to use GPG from PHP
+ *
+ * This file contains an object that handles GPG's status output for the
+ * decrypt operation.
+ *
+ * PHP version 5
+ *
+ * LICENSE:
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * @category  Encryption
+ * @package   Crypt_GPG
+ * @author    Michael Gauthier <mike@silverorange.com>
+ * @copyright 2008-2009 silverorange
+ * @license   http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
+ * @version   CVS: $Id: DecryptStatusHandler.php 302814 2010-08-26 15:43:07Z gauthierm $
+ * @link      http://pear.php.net/package/Crypt_GPG
+ * @link      http://www.gnupg.org/
+ */
+
+/**
+ * Crypt_GPG base class
+ */
+require_once 'Crypt/GPG.php';
+
+/**
+ * GPG exception classes
+ */
+require_once 'Crypt/GPG/Exceptions.php';
+
+
+/**
+ * Status line handler for the decrypt operation
+ *
+ * This class is used internally by Crypt_GPG and does not need be used
+ * directly. See the {@link Crypt_GPG} class for end-user API.
+ *
+ * This class is responsible for sending the passphrase commands when required
+ * by the {@link Crypt_GPG::decrypt()} method. See <b>doc/DETAILS</b> in the
+ * {@link http://www.gnupg.org/download/ GPG distribution} for detailed
+ * information on GPG's status output for the decrypt operation.
+ *
+ * This class is also responsible for parsing error status and throwing a
+ * meaningful exception in the event that decryption fails.
+ *
+ * @category  Encryption
+ * @package   Crypt_GPG
+ * @author    Michael Gauthier <mike@silverorange.com>
+ * @copyright 2008 silverorange
+ * @license   http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
+ * @link      http://pear.php.net/package/Crypt_GPG
+ * @link      http://www.gnupg.org/
+ */
+class Crypt_GPG_DecryptStatusHandler
+{
+    // {{{ protected properties
+
+    /**
+     * Keys used to decrypt
+     *
+     * The array is of the form:
+     * <code>
+     * array(
+     *   $key_id => array(
+     *     'fingerprint' => $fingerprint,
+     *     'passphrase'  => $passphrase
+     *   )
+     * );
+     * </code>
+     *
+     * @var array
+     */
+    protected $keys = array();
+
+    /**
+     * Engine used to which passphrases are passed
+     *
+     * @var Crypt_GPG_Engine
+     */
+    protected $engine = null;
+
+    /**
+     * The id of the current sub-key used for decryption
+     *
+     * @var string
+     */
+    protected $currentSubKey = '';
+
+    /**
+     * Whether or not decryption succeeded
+     *
+     * If the message is only signed (compressed) and not encrypted, this is
+     * always true. If the message is encrypted, this flag is set to false
+     * until we know the decryption succeeded.
+     *
+     * @var boolean
+     */
+    protected $decryptionOkay = true;
+
+    /**
+     * Whether or not there was no data for decryption
+     *
+     * @var boolean
+     */
+    protected $noData = false;
+
+    /**
+     * Keys for which the passhprase is missing
+     *
+     * This contains primary user ids indexed by sub-key id and is used to
+     * create helpful exception messages.
+     *
+     * @var array
+     */
+    protected $missingPassphrases = array();
+
+    /**
+     * Keys for which the passhprase is incorrect
+     *
+     * This contains primary user ids indexed by sub-key id and is used to
+     * create helpful exception messages.
+     *
+     * @var array
+     */
+    protected $badPassphrases = array();
+
+    /**
+     * Keys that can be used to decrypt the data but are missing from the
+     * keychain
+     *
+     * This is an array with both the key and value being the sub-key id of
+     * the missing keys.
+     *
+     * @var array
+     */
+    protected $missingKeys = array();
+
+    // }}}
+    // {{{ __construct()
+
+    /**
+     * Creates a new decryption status handler
+     *
+     * @param Crypt_GPG_Engine $engine the GPG engine to which passphrases are
+     *                                 passed.
+     * @param array            $keys   the decryption keys to use.
+     */
+    public function __construct(Crypt_GPG_Engine $engine, array $keys)
+    {
+        $this->engine = $engine;
+        $this->keys   = $keys;
+    }
+
+    // }}}
+    // {{{ handle()
+
+    /**
+     * Handles a status line
+     *
+     * @param string $line the status line to handle.
+     *
+     * @return void
+     */
+    public function handle($line)
+    {
+        $tokens = explode(' ', $line);
+        switch ($tokens[0]) {
+        case 'ENC_TO':
+            // Now we know the message is encrypted. Set flag to check if
+            // decryption succeeded.
+            $this->decryptionOkay = false;
+
+            // this is the new key message
+            $this->currentSubKeyId = $tokens[1];
+            break;
+
+        case 'NEED_PASSPHRASE':
+            // send passphrase to the GPG engine
+            $subKeyId = $tokens[1];
+            if (array_key_exists($subKeyId, $this->keys)) {
+                $passphrase = $this->keys[$subKeyId]['passphrase'];
+                $this->engine->sendCommand($passphrase);
+            } else {
+                $this->engine->sendCommand('');
+            }
+            break;
+
+        case 'USERID_HINT':
+            // remember the user id for pretty exception messages
+            $this->badPassphrases[$tokens[1]]
+                = implode(' ', array_splice($tokens, 2));
+
+            break;
+
+        case 'GOOD_PASSPHRASE':
+            // if we got a good passphrase, remove the key from the list of
+            // bad passphrases.
+            unset($this->badPassphrases[$this->currentSubKeyId]);
+            break;
+
+        case 'MISSING_PASSPHRASE':
+            $this->missingPassphrases[$this->currentSubKeyId]
+                = $this->currentSubKeyId;
+
+            break;
+
+        case 'NO_SECKEY':
+            // note: this message is also received if there are multiple
+            // recipients and a previous key had a correct passphrase.
+            $this->missingKeys[$tokens[1]] = $tokens[1];
+            break;
+
+        case 'NODATA':
+            $this->noData = true;
+            break;
+
+        case 'DECRYPTION_OKAY':
+            // If the message is encrypted, this is the all-clear signal.
+            $this->decryptionOkay = true;
+            break;
+        }
+    }
+
+    // }}}
+    // {{{ throwException()
+
+    /**
+     * Takes the final status of the decrypt operation and throws an
+     * appropriate exception
+     *
+     * If decryption was successful, no exception is thrown.
+     *
+     * @return void
+     *
+     * @throws Crypt_GPG_KeyNotFoundException if the private key needed to
+     *         decrypt the data is not in the user's keyring.
+     *
+     * @throws Crypt_GPG_NoDataException if specified data does not contain
+     *         GPG encrypted data.
+     *
+     * @throws Crypt_GPG_BadPassphraseException if a required passphrase is
+     *         incorrect or if a required passphrase is not specified. See
+     *         {@link Crypt_GPG::addDecryptKey()}.
+     *
+     * @throws Crypt_GPG_Exception if an unknown or unexpected error occurs.
+     *         Use the <i>debug</i> option and file a bug report if these
+     *         exceptions occur.
+     */
+    public function throwException()
+    {
+        $code = Crypt_GPG::ERROR_NONE;
+
+        if (!$this->decryptionOkay) {
+            if (count($this->badPassphrases) > 0) {
+                $code = Crypt_GPG::ERROR_BAD_PASSPHRASE;
+            } elseif (count($this->missingKeys) > 0) {
+                $code = Crypt_GPG::ERROR_KEY_NOT_FOUND;
+            } else {
+                $code = Crypt_GPG::ERROR_UNKNOWN;
+            }
+        } elseif ($this->noData) {
+            $code = Crypt_GPG::ERROR_NO_DATA;
+        }
+
+        switch ($code) {
+        case Crypt_GPG::ERROR_NONE:
+            break;
+
+        case Crypt_GPG::ERROR_KEY_NOT_FOUND:
+            if (count($this->missingKeys) > 0) {
+                $keyId = reset($this->missingKeys);
+            } else {
+                $keyId = '';
+            }
+            throw new Crypt_GPG_KeyNotFoundException(
+                'Cannot decrypt data. No suitable private key is in the ' .
+                'keyring. Import a suitable private key before trying to ' .
+                'decrypt this data.', $code, $keyId);
+
+        case Crypt_GPG::ERROR_BAD_PASSPHRASE:
+            $badPassphrases = array_diff_key(
+                $this->badPassphrases,
+                $this->missingPassphrases
+            );
+
+            $missingPassphrases = array_intersect_key(
+                $this->badPassphrases,
+                $this->missingPassphrases
+            );
+
+            $message =  'Cannot decrypt data.';
+            if (count($badPassphrases) > 0) {
+                $message = ' Incorrect passphrase provided for keys: "' .
+                    implode('", "', $badPassphrases) . '".';
+            }
+            if (count($missingPassphrases) > 0) {
+                $message = ' No passphrase provided for keys: "' .
+                    implode('", "', $badPassphrases) . '".';
+            }
+
+            throw new Crypt_GPG_BadPassphraseException($message, $code,
+                $badPassphrases, $missingPassphrases);
+
+        case Crypt_GPG::ERROR_NO_DATA:
+            throw new Crypt_GPG_NoDataException(
+                'Cannot decrypt data. No PGP encrypted data was found in '.
+                'the provided data.', $code);
+
+        default:
+            throw new Crypt_GPG_Exception(
+                'Unknown error decrypting data.', $code);
+        }
+    }
+
+    // }}}
+}
+
+?>