password generation service

src/Core/Models/Domain/GeneratedPasswordHistory.cs

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+using System;
+
+namespace Bit.Core.Models.Domain
+{
+    public class GeneratedPasswordHistory
+    {
+        public string Password { get; set; }
+        public DateTime Date { get; set; }
+    }
+}

src/Core/Models/Domain/PasswordGenerationOptions.cs

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+namespace Bit.Core.Models.Domain
+{
+    public class PasswordGenerationOptions
+    {
+        public PasswordGenerationOptions() { }
+
+        public PasswordGenerationOptions(bool defaultOptions)
+        {
+            if(defaultOptions)
+            {
+                Length = 14;
+                Ambiguous = false;
+                Number = true;
+                MinNumber = 1;
+                Uppercase = true;
+                MinUppercase = 0;
+                Lowercase = true;
+                MinLowercase = 0;
+                Special = false;
+                MinSpecial = 1;
+                Type = "password";
+                NumWords = 3;
+                WordSeparator = "-";
+            }
+        }
+
+        public int? Length { get; set; }
+        public bool? Ambiguous { get; set; }
+        public bool? Number { get; set; }
+        public int? MinNumber { get; set; }
+        public bool? Uppercase { get; set; }
+        public int? MinUppercase { get; set; }
+        public bool? Lowercase { get; set; }
+        public int? MinLowercase { get; set; }
+        public bool? Special { get; set; }
+        public int? MinSpecial { get; set; }
+        public string Type { get; set; }
+        public int? NumWords { get; set; }
+        public string WordSeparator { get; set; }
+
+        public void Merge(PasswordGenerationOptions defaults)
+        {
+            Length = Length ?? defaults.Length;
+            Ambiguous = Ambiguous ?? defaults.Ambiguous;
+            Number = Number ?? defaults.Number;
+            MinNumber = MinNumber ?? defaults.MinNumber;
+            Uppercase = Uppercase ?? defaults.Uppercase;
+            MinUppercase = MinUppercase ?? defaults.MinUppercase;
+            Lowercase = Lowercase ?? defaults.Lowercase;
+            MinLowercase = MinLowercase ?? defaults.MinLowercase;
+            Special = Special ?? defaults.Special;
+            MinSpecial = MinSpecial ?? defaults.MinSpecial;
+            Type = Type ?? defaults.Type;
+            NumWords = NumWords ?? defaults.NumWords;
+            WordSeparator = WordSeparator ?? defaults.WordSeparator;
+        }
+    }
+}