js: encrypt improvement and decrypt method

* Compatibility class gpgme_openpgpjs offers an API that should accept
  openpgpjs syntax, throwing errors if a parameter is unexpected/not
  implemented
* tried to be more generic in methods
* waiting for multiple answers if 'more' is in the answer
* more consistency checking on sending and receiving
* updated the example extension
--

1 files changed, 84 insertions, 0 deletions

diff --git a/lang/js/src/Helpers.js b/lang/js/src/Helpers.js
new file mode 100644
index 00000000..eeb7a3c4
--- /dev/null
+++ b/lang/js/src/Helpers.js
@@ -0,0 +1,84 @@
+/* gpgme.js - Javascript integration for gpgme
+ * Copyright (C) 2018 Bundesamt für Sicherheit in der Informationstechnik
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME 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.
+ *
+ * GPGME 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 program; if not, see <http://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+/**
+ * Tries to return an array of fingerprints, either from input fingerprints or
+ * from Key objects
+ * @param {String|Array<String>} input Input value.
+ * @returns {Array<String>} Array of fingerprints.
+ */
+export function toKeyIdArray(input){
+    if (!input){
+        return [];
+        // TODO: Warning or error here? Did we expect something or is "nothing" okay?
+    }
+    if (input instanceof Array){
+        let result = [];
+        for (let i=0; i < input.length; i++){
+            if (isFingerprint(input[i]) === true){
+                result.push(input[i]);
+            } else {
+                //TODO error?
+                console.log('gpgmejs/Helpers.js Warning: '+
+                    input[i] +
+                    ' is not a valid key fingerprint and will not be used');
+            }
+        }
+        return result;
+    } else if (isFingerprint(input) === true) {
+        return [input];
+    }
+    console.log('gpgmejs/Helpers.js Warning: ' + input +
+                    ' is not a valid key fingerprint and will not be used');
+    return [];
+};
+
+/**
+ * check if values are valid hexadecimal values of a specified length
+ * @param {*} key input value.
+ * @param {int} len the expected length of the value
+ */
+function hextest(key, len){
+    if (!key || typeof(key) !== "string"){
+        return false;
+    }
+    if (key.length !== len){
+        return false;
+    }
+    let regexp= /^[0-9a-fA-F]*$/i;
+    return regexp.test(key);
+};
+
+/**
+ * check if the input is a valid Hex string with a length of 40
+ */
+export function isFingerprint(string){
+    return hextest(string, 40);
+};
+
+//TODO needed anywhere?
+function isLongId(string){
+    return hextest(string, 16);
+};
+
+//TODO needed anywhere?
+function isShortId(string){
+    return hextest(string, 8);
+};