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middleware.go
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middleware.go
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package echosec
import (
"context"
"errors"
"github.com/getkin/kin-openapi/openapi3filter"
"github.com/labstack/echo/v4"
"github.com/mitchellh/mapstructure"
)
// OApiValidationFunc is a function meant to validate whether the requesting entity has the permission to access
// a certain resource
type OApiValidationFunc func(c echo.Context, params []string) error
// WithOpenApiConfig creates an echo.MiddlewareFunc function given an OApiConfig object
func WithOpenApiConfig(cfg OApiConfig) echo.MiddlewareFunc {
return func(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
route, pathParams, err := cfg.router.FindRoute(c.Request())
if err != nil {
return err
}
sec := route.Operation.Extensions["x-echosec"]
var localConfig OApiEchoSec
err = mapstructure.Decode(sec, &localConfig)
if err != nil {
return errors.New("error in local configuration")
}
f := cfg.validators[localConfig.Function]
if f == nil {
return errors.New("validator function not found")
}
params := localConfig.Params
if params == nil {
params = make([]string, 0)
}
err = f(c, params)
if err != nil {
return err
}
if cfg.openApiValidationEnabled {
requestValidationInput := &openapi3filter.RequestValidationInput{
Request: c.Request(),
PathParams: pathParams,
Route: route,
Options: &openapi3filter.Options{
AuthenticationFunc: func(ctx context.Context, input *openapi3filter.AuthenticationInput) error {
return nil
},
},
}
c.Set(requestValidationInputAttr, requestValidationInput)
err = openapi3filter.ValidateRequest(c.Request().Context(), requestValidationInput)
if err != nil {
return err
}
return next(c)
}
return next(c)
}
}
}