1 files changed, 94 insertions, 0 deletions
diff --git a/etherpad/src/static/js/billing_shared.js b/etherpad/src/static/js/billing_shared.js
new file mode 100644
index 0000000..dc3a00c
--- /dev/null
+++ b/etherpad/src/static/js/billing_shared.js
@@ -0,0 +1,94 @@
+/**
+ * Copyright 2009 Google Inc.
+ * 
+ * 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.
+ */
+
+var billing = {};
+
+billing.CC = function(shortName, prefixes, length) {
+  this.type = shortName;
+  this.prefixes = prefixes;
+  this.length = length;
+  function validateLuhn(number) {
+    var digits = [];
+    var sum = 0;
+    for (var i = 0; i < number.length; ++i) {
+      var c = Number(number.charAt(number.length-1-i));
+      sum += c;
+      if (i % 2 == 1) { // every second digit
+        sum += c;
+        if (2*c >= 10) {
+          sum -= 9;
+        }
+      }
+    }
+    return (sum % 10 == 0);    
+  }
+  this.validatePrefix = function(number) {
+    for (var i = 0; i < this.prefixes.length; ++i) {
+      if (number.indexOf(String(this.prefixes[i])) == 0) {
+        return true;
+      }
+    }
+    return false;
+  }
+  this.validateLength = function(number) {
+    return number.length == this.length;
+  }
+  
+  this.validateNumber = function(number) {
+    return this.validateLength(number) &&
+      this.validatePrefix(number) &&
+      validateLuhn(number);
+  }
+}
+
+billing.ccTypes = [
+  new billing.CC('amex', [34, 37], 15),
+  new billing.CC('disc', [6011, 644, 645, 646, 647, 648, 649, 65], 16),
+  new billing.CC('mc', [51, 52, 53, 54, 55], 16),
+  new billing.CC('visa', [4], 16)];
+
+billing.validateCcNumber = function(number) {
+  if (! (/^\d+$/.test(number))) { 
+    return false;
+  }
+  for (var i = 0; i < billing.ccTypes.length; ++i) {
+    var ccType = billing.ccTypes[i];
+    if (ccType.validatePrefix(number)) {
+      return ccType.validateNumber(number);
+    }
+  }
+  return false;
+}
+
+billing.validateCcLength = function(number) {
+  for (var i = 0; i < billing.ccTypes.length; ++i) {
+    var ccType = billing.ccTypes[i];
+    if (ccType.validatePrefix(number)) {
+      return ccType.validateLength(number);
+    }
+  }
+  return false;
+}
+
+billing.getCcType = function(number) {
+  for (var i = 0; i < billing.ccTypes.length; ++i) {
+    var ccType = billing.ccTypes[i];
+    if (ccType.validatePrefix(number)) {
+      return ccType.type;
+    }
+  }
+  return false;  
+}