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request.go
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request.go
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package request
import (
"encoding/json"
"net/http"
"github.com/sganon/go-request/form"
"github.com/sganon/go-request/problem"
)
type Output interface {
Validate() []problem.ParamError
}
func Decode(r *http.Request, formOutput interface{}, bodyOutput interface{}) problem.Problem {
var ok bool
var inputProblem *problem.Input
var unexpectedProblem *problem.UnexpectedProblem
if formOutput != nil {
formDecoder := form.NewDecoder(r)
err := formDecoder.Decode(formOutput)
if prob, ok := err.(*problem.Input); ok && prob != nil {
inputProblem = prob
}
if unexpectedProblem, ok = err.(*problem.UnexpectedProblem); ok && unexpectedProblem != nil {
return unexpectedProblem
}
}
if bodyOutput != nil {
bodyDecoder := json.NewDecoder(r.Body)
defer r.Body.Close()
err := bodyDecoder.Decode(&bodyOutput)
if err != nil {
return &problem.DefaultUnexpected
}
}
if inputProblem == nil {
return nil
}
return inputProblem
}
func DecodeAndValidate(r *http.Request, formOutput Output, bodyOutput Output) problem.Problem {
var inputProblem *problem.Input
p := Decode(r, formOutput, bodyOutput)
if prob, ok := p.(*problem.Input); ok {
inputProblem = prob
} else {
return prob
}
if formOutput != nil {
formErrors := formOutput.Validate()
if len(formErrors) > 0 {
if inputProblem == nil {
prob := problem.DefaultInput
inputProblem = &prob
}
inputProblem.InvalidParams = append(inputProblem.InvalidParams, formErrors...)
}
}
if bodyOutput != nil {
bodyErrors := bodyOutput.Validate()
if len(bodyErrors) > 0 {
if inputProblem == nil {
prob := problem.DefaultInput
inputProblem = &prob
}
inputProblem.InvalidParams = append(inputProblem.InvalidParams, bodyErrors...)
}
}
if inputProblem == nil {
return nil
}
return inputProblem
}