78 lines
1.7 KiB
Go
78 lines
1.7 KiB
Go
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package api
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import (
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"encoding/json"
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"net/http"
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validator "gopkg.in/go-playground/validator.v9"
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)
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const (
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ErrCodeMalformedRequest ErrorCode = "malformed-request"
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ErrCodeInvalidRequest ErrorCode = "invalid-request"
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ErrCodeInvalidFieldValue ErrorCode = "invalid-field-value"
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)
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// Bind parses and bind the request body to the given target
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// Bind wil also validates the received data with a validator instance.
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// If the data does not match the target constraints, an ErrorResponse will be
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// sent back.
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// See gopkg.in/go-playground/validator.v9 for more informations about data
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// validation.
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func Bind(w http.ResponseWriter, r *http.Request, target interface{}) (ok bool) {
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if err := parseBody(r, target); err != nil {
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ErrorResponse(
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w, http.StatusBadRequest,
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ErrCodeMalformedRequest,
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nil,
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)
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return false
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}
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validate := validator.New()
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if err := validate.Struct(target); err != nil {
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handleValidateError(w, err)
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return false
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}
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return true
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}
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func parseBody(r *http.Request, target interface{}) error {
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decoder := json.NewDecoder(r.Body)
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if err := decoder.Decode(target); err != nil {
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return err
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}
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return nil
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}
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type fieldError struct {
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Field string
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Tag string
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Param string
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}
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func handleValidateError(w http.ResponseWriter, err error) {
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if validationErrors, ok := err.(validator.ValidationErrors); ok {
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fields := make([]fieldError, 0)
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for _, e := range validationErrors {
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fields = append(fields, fieldError{
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Field: e.Field(),
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Tag: e.Tag(),
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Param: e.Param(),
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})
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}
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ErrorResponse(
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w, http.StatusBadRequest,
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ErrCodeInvalidFieldValue,
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map[string]interface{}{
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"Fields": fields,
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},
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)
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return
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}
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ErrorResponse(
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w, http.StatusBadRequest,
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ErrCodeInvalidRequest,
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nil,
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)
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}
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