giredore/internal/httpserver/strictjson.go

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package httpserver
import (
// stdlib
"encoding/json"
"fmt"
"net/http"
// other
"github.com/labstack/echo"
)
// StrictJSONBinder implements Binder interface for Echo. It will parse
// JSON in strict mode throwing errors on schema mismatches.
type StrictJSONBinder struct{}
// Bind parses JSON input.
func (sjb *StrictJSONBinder) Bind(i interface{}, c echo.Context) error {
req := c.Request()
if req.ContentLength == 0 {
return echo.NewHTTPError(http.StatusBadRequest, "Request body can't be empty")
}
// Decode it.
decoder := json.NewDecoder(req.Body)
decoder.DisallowUnknownFields()
if err := decoder.Decode(i); err != nil {
if ute, ok := err.(*json.UnmarshalTypeError); ok {
return echo.NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Unmarshal type error: expected=%v, got=%v, field=%v, offset=%v", ute.Type, ute.Value, ute.Field, ute.Offset))
} else if se, ok := err.(*json.SyntaxError); ok {
return echo.NewHTTPError(http.StatusBadRequest, fmt.Sprintf("Syntax error: offset=%v, error=%v", se.Offset, se.Error()))
} else {
return echo.NewHTTPError(http.StatusBadRequest, err.Error())
}
}
return nil
}