Add random.org for random number generation.

src/Bot/Commands/Utils/Quote/Quote.cs

@@ -46,7 +46,7 @@ namespace Geekbot.Bot.Commands.Utils.Quote
                     return;
                 }
 
-                var random = _randomNumberGenerator.Next(0, s.Count);
+                var random = _randomNumberGenerator.Next(0, s.Count - 1);
                 var quote = s[random];
                 
                 var embed = QuoteBuilder(quote);

src/Bot/Program.cs

@@ -164,7 +164,7 @@ namespace Geekbot.Bot
             var emojiConverter = new EmojiConverter();
             var mtgManaConverter = new MtgManaConverter();
             var wikipediaClient = new WikipediaClient();
-            var randomNumberGenerator = new RandomNumberGenerator();
+            var randomNumberGenerator = new RandomNumberGenerator(_globalSettings);
             var mediaProvider = new MediaProvider(_logger, randomNumberGenerator);
             var kvMemoryStore = new KvInInMemoryStore();
             var errorHandler = new ErrorHandler(_logger, _runParameters, () => Localization.Internal.SomethingWentWrong);

src/Core/Core.csproj

@@ -11,6 +11,7 @@
     </PropertyGroup>
 
     <ItemGroup>
+        <PackageReference Include="Anemonis.RandomOrg" Version="1.14.0" />
         <PackageReference Include="CommandLineParser" Version="2.8.0" />
         <PackageReference Include="Discord.Net" Version="2.2.0" />
         <PackageReference Include="Microsoft.EntityFrameworkCore" Version="5.0.0-rc.1.*" />

src/Core/RandomNumberGenerator/RandomNumberGenerator.cs

@@ -1,25 +1,69 @@
 using System;
 using System.Security.Cryptography;
+using Anemonis.RandomOrg;
+using Geekbot.Core.GlobalSettings;
 
 namespace Geekbot.Core.RandomNumberGenerator
 {
     public class RandomNumberGenerator : IRandomNumberGenerator
     {
-        readonly RNGCryptoServiceProvider csp;
+        private readonly RNGCryptoServiceProvider csp;
+        private readonly bool _canUseRandomOrg;
+        private readonly RandomOrgClient _randomOrgClient;
 
-        public RandomNumberGenerator()
+        public RandomNumberGenerator(IGlobalSettings globalSettings)
         {
             csp = new RNGCryptoServiceProvider();
+
+            var randomOrgApiKey = globalSettings.GetKey("RandomOrgApiKey");
+            if (!string.IsNullOrEmpty(randomOrgApiKey))
+            {
+                _canUseRandomOrg = true;
+                _randomOrgClient = new RandomOrgClient(randomOrgApiKey);
+            }
         }
 
-        public int Next(int minValue, int maxExclusiveValue)
+        public int Next(int minValue, int maxInclusiveValue)
         {
-            if (minValue >= maxExclusiveValue)
+            if (minValue == maxInclusiveValue)
+            {
+                return maxInclusiveValue;
+            }
+            
+            if (minValue >= maxInclusiveValue)
             {
                 throw new ArgumentOutOfRangeException("minValue must be lower than maxExclusiveValue");
             }
             
-            var diff = (long)maxExclusiveValue - minValue;
+            if (_canUseRandomOrg)
+            {
+                try
+                {
+                    return GetFromRandomOrg(minValue, maxInclusiveValue);
+                }
+                catch
+                {
+                    // ignore
+                }
+            }
+
+            return GetFromCrypto(minValue, maxInclusiveValue);
+        }
+
+        private int GetFromRandomOrg(int minValue, int maxInclusiveValue)
+        {
+            return _randomOrgClient
+                .GenerateIntegersAsync(1, minValue, maxInclusiveValue, false)
+                .Result
+                .Random
+                .Data[0];
+        }
+
+        private int GetFromCrypto(int minValue, int maxInclusiveValue)
+        {
+            var maxExclusiveValue = maxInclusiveValue + 1;
+
+            var diff = (long) maxExclusiveValue - minValue;
             var upperBound = uint.MaxValue / diff * diff;
 
             uint ui;
@@ -27,7 +71,8 @@ namespace Geekbot.Core.RandomNumberGenerator
             {
                 ui = GetRandomUInt();
             } while (ui >= upperBound);
-            return (int)(minValue + (ui % diff));
+
+            return (int) (minValue + (ui % diff));
         }
 
         private uint GetRandomUInt()

tests/Core/DiceParser/DiceParser.test.cs

@@ -1,14 +1,16 @@
 using System.Collections.Generic;
 using System.Text.Json;
 using Geekbot.Core.DiceParser;
+using Geekbot.Core.GlobalSettings;
 using Geekbot.Core.RandomNumberGenerator;
+using Moq;
 using Xunit;
 
 namespace Tests.Core.DiceParser
 {
     public class DiceParserTest
     {
-        private static readonly RandomNumberGenerator _randomNumberGenerator = new RandomNumberGenerator();
+        private static readonly RandomNumberGenerator _randomNumberGenerator = new RandomNumberGenerator(new Mock<IGlobalSettings>().Object);
 
         public struct DiceParserTestDto
         {

tests/Core/DiceParser/SingleDie.test.cs

@@ -1,5 +1,7 @@
 using Geekbot.Core.DiceParser;
+using Geekbot.Core.GlobalSettings;
 using Geekbot.Core.RandomNumberGenerator;
+using Moq;
 using Xunit;
 
 namespace Tests.Core.DiceParser
@@ -43,7 +45,7 @@ namespace Tests.Core.DiceParser
         [Theory, MemberData(nameof(SingleDieNameTestData))]
         public void SingleDieNameTestFunc(string testName, SingleDieNameTestDto testData)
         {
-            var die = new SingleDie(new RandomNumberGenerator()) {AdvantageType = testData.AdvantageType};
+            var die = new SingleDie(new RandomNumberGenerator(new Mock<IGlobalSettings>().Object)) {AdvantageType = testData.AdvantageType};
             Assert.Equal(die.DiceName, testData.Expected);
         }
 
@@ -106,7 +108,7 @@ namespace Tests.Core.DiceParser
         [Theory, MemberData(nameof(SingleDieValidationTestData))]
         public void SingleDieValidationTestFunc(string testName, SingleDieValidationTestDto testData)
         {
-            var die = new SingleDie(new RandomNumberGenerator())
+            var die = new SingleDie(new RandomNumberGenerator(new Mock<IGlobalSettings>().Object))
             {
                 Amount = testData.Amount,
                 Sides = testData.Sides