Initial commit carried over from private repo. This is V2.

code/MessengerApi.Configuration/Parsers/CorsParser.cs

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+namespace MessengerApi.Configuration.Parsers
+{
+    public static class CorsParser
+    {
+        public static string[] Parse(string value)
+        {
+            if (string.IsNullOrWhiteSpace(value)) return [];
+            return value.Trim().Split(",", StringSplitOptions.RemoveEmptyEntries);
+        }
+    }
+}

code/MessengerApi.Configuration/Parsers/EnvironmentPersistenceConfigurationParser.cs

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+using MessengerApi.Configuration.Model.Persistence;
+using MessengerApi.Configuration.Model.Persistence.Base;
+using MessengerApi.Configuration.Sources.Environment;
+
+namespace MessengerApi.Configuration.Parsers
+{
+    public static class EnvironmentPersistenceConfigurationParser
+    {
+        public static PersistenceConfiguration Parse(IEnvironmentConfigurationSource config)
+        {
+            var type = PersistenceTypeParser.Parse(config.GetValue<string>(Constants.EnvironmentVariables.PERSISTENCE_TYPE));
+            
+            if(type == Enums.PersistenceTypes.Sql)
+            {
+                return new SqlPersistenceConfiguration(config);
+            }
+            else if(type == Enums.PersistenceTypes.PostgreSql)
+            {
+                return new NpgPersistenceConfiguration(config);
+            }
+
+            throw new InvalidOperationException("Unrecognized persistence type.");
+        }
+    }
+}

code/MessengerApi.Configuration/Parsers/HousekeepingMessageStateParser.cs

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+using MessengerApi.Configuration.Enums;
+
+namespace MessengerApi.Configuration.Parsers
+{
+    public static class HousekeepingMessageStateParser
+    {
+        public static HousekeepingMessageStates Parse(string input)
+        {
+            return (HousekeepingMessageStates)Enum.Parse(typeof(HousekeepingMessageStates), input.Trim(), true);
+        }
+    }
+}

code/MessengerApi.Configuration/Parsers/LoggingVerbosityParser.cs

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+using MessengerApi.Configuration.Enums;
+
+namespace MessengerApi.Configuration.Parsers
+{
+    public static class LoggingVerbosityParser
+    {
+        public static LoggingVerbosity Parse(string value)
+        {
+            return (LoggingVerbosity)Enum.Parse(typeof(LoggingVerbosity), value.Trim(), true);
+        }
+    }
+}

code/MessengerApi.Configuration/Parsers/PersistenceTypeParser.cs

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+using MessengerApi.Configuration.Enums;
+
+namespace MessengerApi.Configuration.Parsers
+{
+    public static class PersistenceTypeParser
+    {
+        public static PersistenceTypes Parse(string value)
+        {
+            return (PersistenceTypes)Enum.Parse(typeof(PersistenceTypes), value, true);
+        }
+    }
+}

code/MessengerApi.Configuration/Parsers/ProxiesParser.cs

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+namespace MessengerApi.Configuration.Parsers
+{
+    public static class ProxiesParser
+    {
+        public static string[] Parse(string value)
+        {
+            if (string.IsNullOrWhiteSpace(value)) return [];
+            return value.Trim().Split(",", StringSplitOptions.RemoveEmptyEntries);
+        }
+    }
+}