Parameters validation

With SugoiJS request parameters validation become easier
Overview
SugoiJS provides easy, one line solution for validating the request, this by using the @RequestSchemaPolicy decorator.
The RequestSchemaPolicy is similar to socket module SocketSchemaPolicy method.
SugoiJS server module uses @sugoi/core policies ability for supplying pre-defined policies
SugoiJS re-export SchemaTypes, TPolicy, TComparableSchema, Policy, UsePolicy, ComparableSchema from "@sugoi/core";
Further information can be found on the @sugoi/core package documentation​
RequestSchemaPolicy
RequestSchemaPolicy - decleration
/**
 *  paramSchema         - req.params
 *  queryParamSchema    - req.query
 *  bodySchema          - req.body
 *  headersSchema       - req.headers
 **/
export function RequestSchemaPolicy(paramSchema: TComparableSchema | AJV | Joi);
export function RequestSchemaPolicy(paramSchema: TComparableSchema | AJV | Joi, queryParamSchema: TComparableSchema);
export function RequestSchemaPolicy(paramSchema: TComparableSchema | AJV | Joi, queryParamSchema: TComparableSchema, bodySchema: TComparableSchema);
export function RequestSchemaPolicy(paramSchema: TComparableSchema | AJV | Joi, queryParamSchema: TComparableSchema, bodySchema: TComparableSchema, headersSchema: TComparableSchema);
The RequestSchemaPolicy decorator use for validating the request, this while using a valid schema for Request params, Query params, body, headers.
In case null will pass the value won't be check.
Example:
@Controller('/dashboard')
export class DashboardController {
    constructor() {
    }
​
    @HttpPost("/:id")
    @RequestSchemaPolicy(
    {"id": ComparableSchema.ofType(SchemaTypes.NUMBER)},// Path parameters schema
     null,// Query parameters schema
     {
     "role": ComparableSchema.ofType(
                                     {
                                         text: ComparableSchema
                                                 .ofType(SchemaTypes.STRING)
                                                 .setRegex("([A-Z])+","i")
                                     }
                                     )
     },// body schema is {role:{text:string//with regex - /([A-Z])+/i}}
     new Ajv().compile(ajvHeaderSchema) // header schema
     )
    getUser(@RequestParam("id") id:number, @RequestBody() body:{role:{text:string}}) {
        return User.findOne({id,role:body.role.text})
    }
​
}
Validation per parameter type
RequestParamsSchemaPolicy
For validating only the request parameters you can use RequestParamsSchemaPolicy 
function RequestParamsSchemaPolicy(schema: TComparableSchema)
RequestQueryParamsSchemaPolicy
For validating only the request query parameters you can useRequestQueryParamsSchemaPolicy 
function RequestQueryParamsSchemaPolicy(schema: TComparableSchema)
RequestBodySchemaPolicy
For validating only the request body you can useRequestBodySchemaPolicy
function RequestBodySchemaPolicy(schema: TComparableSchema)
RequestHeadersSchemaPolicy
For validating only the request headers you can use RequestHeadersSchemaPolicy
function RequestHeadersSchemaPolicy(schema: TComparableSchema)
Full example
    @HttpPost("/:id")
    @RequestParamsSchemaPolicy(RequestWithIDSchema)
    @RequestQueryParamsSchemaPolicy({
       check: ComparableSchema.ofType(SchemaTypes.STRING).setMandatory(false)
    })
    @RequestBodySchemaPolicy({
       data: ComparableSchema.ofType(SchemaTypes.STRING).setMandatory(true)
    })
    @RequestHeadersSchemaPolicy({
       "x-user-language":ComparableSchema.ofType(SchemaTypes.STRING).setMandatory(true)
    })
    public setData(@RequestParam("id") id: string) {
       // finally the logic
    }
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