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