Implement the dynamic crud endpoint

ChaosBot/WebServer/App/ApiControllers/BaseApiController.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using System.Dynamic;
 using System.Linq;
+using System.Text.Json;
 using System.Threading.Tasks;
 using ChaosBot.Models;
 using ChaosBot.WebServer.Services;
@@ -15,12 +16,15 @@ namespace ChaosBot.WebServer.App.ApiControllers
     public abstract class BaseApiController<T, TDeleteParameter> : Controller where T : class, new()
     {
         protected readonly AccessTokenCache AccessTokenCache;
+        protected readonly ValidationService ValidationService;
 
         protected BaseApiController(
-            AccessTokenCache accessTokenCache
+            AccessTokenCache accessTokenCache,
+            ValidationService validationService
         )
         {
             AccessTokenCache = accessTokenCache;
+            ValidationService = validationService;
         }
 
         public async Task<IActionResult> Index(ulong guildId)
@@ -50,11 +54,14 @@ namespace ChaosBot.WebServer.App.ApiControllers
             return Content(JsonConvert.SerializeObject(response), new MediaTypeHeaderValue("application/json"));
         }
 
-        public async Task<IActionResult> Upsert(ulong guildId, dynamic requestBody)
+        public async Task<IActionResult> Upsert(ulong guildId, JsonElement requestBody)
         {
             if (!CheckPermissions.GetResult(AccessTokenCache, Request, guildId, out IActionResult result))
                 return result;
 
+            if (!ValidationService.Validate(requestBody, GetValidationRules(), out string errors))
+                return BadRequest(errors);
+            
             await using ChaosbotContext dbContext = new ChaosbotContext();
 
             T databaseObject = new T();

ChaosBot/WebServer/App/ApiControllers/CustomCommandController.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Linq;
+using System.Text.Json;
 using System.Threading.Tasks;
 using ChaosBot.Models;
 using ChaosBot.WebServer.Models;
@@ -15,9 +16,11 @@ namespace ChaosBot.WebServer.App.ApiControllers
     public class CustomCommandController : BaseApiController<CustomCommand, string>
     {
         public CustomCommandController(
-            AccessTokenCache accessTokenCache
+            AccessTokenCache accessTokenCache,
+            ValidationService validationService
         ) : base(
-            accessTokenCache
+            accessTokenCache,
+            validationService
         ) {}
         
         [HttpGet]
@@ -31,7 +34,7 @@ namespace ChaosBot.WebServer.App.ApiControllers
         [Route("{guildId}")]
         public async Task<IActionResult> UpsertAction(
             [FromRoute] ulong guildId,
-            [FromBody] dynamic requestBody)
+            [FromBody] JsonElement requestBody)
         {
             return await Upsert(guildId, requestBody);
         }
@@ -64,7 +67,12 @@ namespace ChaosBot.WebServer.App.ApiControllers
 
         protected override Dictionary<string, List<string>> GetValidationRules()
         {
-            return new Dictionary<string, List<string>>();
+            return new Dictionary<string, List<string>>
+            {
+                {"Command", new List<string>{"required", "type:string", "min:1", "max:128"}},
+                {"Type", new List<string>{"required", "type:integer", "in:CustomCommandType"}},
+                {"Content", new List<string>{"required", "type:string"}},
+            };
         }
 
         protected override UpsertCommandBuilder<CustomCommand> ApplyFilterForUpsert(

ChaosBot/WebServer/Services/ValidationService.cs

@@ -0,0 +1,198 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
+
+namespace ChaosBot.WebServer.Services
+{
+    public class ValidationService
+    {
+        public bool Validate(JsonElement requestBody, Dictionary<string,List<string>> getValidationRules, out string error)
+        {
+            StringBuilder errorBuilder = new StringBuilder();
+
+            foreach (KeyValuePair<string,List<string>> validationRule in getValidationRules)
+            {
+                string key = validationRule.Key;
+                dynamic value = GetValueFromRequest(requestBody, key);
+                
+                List<string> rules = validationRule.Value;
+
+                foreach (string rule in rules)
+                {
+                    string[] ruleParts = rule.Split(':');
+                    string ruleType = ruleParts.First();
+
+                    if (ruleType == null)
+                        continue;
+
+                    ValidationResult result = ruleType switch
+                    {
+                        "required" => CheckRequired(key, value),
+                        "type" => CheckType(key, value, ruleParts),
+                        "min" => CheckMin(key, value, ruleParts),
+                        "max" => CheckMax(key, value, ruleParts),
+                        _ => new ValidationResult.Unknown()
+                    };
+
+                    if (result.GetError() != null)
+                    {
+                        errorBuilder.AppendLine($"[{result.GetKey()}] {result.GetError()}");
+                        break;
+                    }
+                }
+            }
+
+            error = errorBuilder.ToString();
+            return error.Length == 0;
+        }
+
+        private static dynamic GetValueFromRequest(JsonElement requestBody, string key)
+        {
+            JsonElement prop;
+            try
+            {
+                prop = requestBody.GetProperty(key);
+            }
+            catch (KeyNotFoundException)
+            {
+                return null;
+            }
+
+            return prop.ValueKind switch
+            {
+                JsonValueKind.String => prop.GetString(),
+                JsonValueKind.Number => prop.GetInt64(),
+                JsonValueKind.True => prop.GetBoolean(),
+                JsonValueKind.False => prop.GetBoolean(),
+                _ => null
+            };
+        }
+
+        private ValidationResult CheckRequired(string key, dynamic value)
+        {
+            if (value != null)
+                return new ValidationResult.Success();
+            return new ValidationResult.Failure(key, $"{key} is required");
+        }
+
+        private ValidationResult CheckType(string key, dynamic value, string[] ruleParts)
+        {
+            if (ruleParts.Length != 2) return new ValidationResult.Unknown();
+
+            Type type = ruleParts[1] switch
+            {
+                "string" => typeof(string),
+                "boolean" => typeof(bool),
+                "short" => typeof(short),
+                "ushort" => typeof(ushort),
+                "int" => typeof(int),
+                "uint" => typeof(uint),
+                "long" => typeof(long),
+                "ulong" => typeof(ulong),
+                _ => null
+            };
+            
+            if (type == null)
+                return new ValidationResult.Unknown();
+
+            dynamic val = Convert.ChangeType(value, type);
+            if (val != null)
+                return new ValidationResult.Success();
+            return new ValidationResult.Failure(key, $"{key} could not be interpreted as {ruleParts[1]}");
+        }
+
+        private ValidationResult CheckMin(string key, dynamic value, string[] ruleParts)
+        {
+            if (ruleParts.Length != 2) return new ValidationResult.Unknown();
+            
+            if (value is string stringValue)
+            {
+                int minLength = Convert.ToInt32(ruleParts[1]);
+                if (stringValue.Length < minLength)
+                    return new ValidationResult.Failure(key, $"{key} cannot be shorter than {minLength} characters");
+            } else if (value is ulong intValue)
+            {
+                ulong minSize = Convert.ToUInt64(ruleParts[1]);
+                if (intValue < minSize)
+                    return new ValidationResult.Failure(key, $"{key} must be greater than or equal to {minSize}");
+            } else if (value is double floatValue)
+            {
+                double minSize = Convert.ToDouble(ruleParts[1]);
+                if (floatValue < minSize)
+                    return new ValidationResult.Failure(key, $"{key} must be greater than or equal to {minSize}");
+            }
+            else
+            {
+                return new ValidationResult.Unknown();
+            }
+            
+            return new ValidationResult.Success();
+        }
+
+        private ValidationResult CheckMax(string key, dynamic value, string[] ruleParts)
+        {
+            if (ruleParts.Length != 2) return new ValidationResult.Unknown();
+            
+            if (value is string stringValue)
+            {
+                int maxLength = Convert.ToInt32(ruleParts[1]);
+                if (stringValue.Length > maxLength)
+                    return new ValidationResult.Failure(key, $"{key} cannot be longer than {maxLength} characters");
+            } else if (value is ulong intValue)
+            {
+                ulong maxSize = Convert.ToUInt64(ruleParts[1]);
+                if (intValue > maxSize)
+                    return new ValidationResult.Failure(key, $"{key} must be less than or equal to {maxSize}");
+            } else if (value is double floatValue)
+            {
+                double maxSize = Convert.ToDouble(ruleParts[1]);
+                if (floatValue > maxSize)
+                    return new ValidationResult.Failure(key, $"{key} must be less than or equal to {maxSize}");
+            }
+            else
+            {
+                return new ValidationResult.Unknown();
+            }
+            
+            return new ValidationResult.Success();
+        }
+    }
+
+    internal class ValidationResult
+    {
+        private readonly string _errorMessage;
+        private readonly string _key;
+
+        private ValidationResult()
+        {
+            _errorMessage = null;
+            _key = null;
+        }
+
+        private ValidationResult(string key, string errorMessage)
+        {
+            _errorMessage = errorMessage;
+            _key = key;
+        }
+        
+        internal class Success : ValidationResult {}
+
+        internal class Failure : ValidationResult
+        {
+            public Failure(string key, string message) : base(key, message) {}
+        }
+        internal class Unknown : ValidationResult {}
+
+        public string GetError()
+        {
+            return this._errorMessage;
+        }
+
+        public string GetKey()
+        {
+            return this._key;
+        }
+    }
+}

ChaosBot/WebServer/Startup.cs

@@ -33,6 +33,7 @@ namespace ChaosBot.WebServer
                 .AddSingleton(sp => new AccessTokenCache())
                 .AddSingleton(sp => new DiscordInviteGenerator())
                 .AddSingleton(sp => new HttpClient())
+                .AddSingleton(sp => new ValidationService())
             ;
         }
         

ChaosBot/wwwroot

@@ -1 +1 @@
-Subproject commit 07d2c3dc0e7ba5bfaa8eac94dad814f1a333a6eb
+Subproject commit 56e8caf708d791a2b05b12e82fd407905147fafd