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middleware_request_body.go
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middleware_request_body.go
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package oas
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"regexp"
"github.com/go-openapi/spec"
"github.com/hypnoglow/oas2/validate"
)
// requestBodyValidator is a middleware that validates request body by OpenAPI
// operation definition.
type requestBodyValidator struct {
next http.Handler
// jsonSelectors represent content-type selectors. If any selector
// matches content-type of the request, then request body will be validated.
// Otherwise no validation is performed.
jsonSelectors []*regexp.Regexp
problemHandler ProblemHandler
continueOnProblem bool
}
func (mw *requestBodyValidator) ServeHTTP(w http.ResponseWriter, req *http.Request, params []spec.Parameter, ok bool) {
if !ok {
mw.next.ServeHTTP(w, req)
return
}
if req.Body == http.NoBody {
for _, param := range params {
if param.In == "body" && param.Required {
// No request body found, but operation actually requires body.
e := fmt.Errorf("request body is empty, but the operation requires non-empty body")
mw.problemHandler.HandleProblem(NewProblem(w, req, e))
if !mw.continueOnProblem {
return
}
}
}
mw.next.ServeHTTP(w, req)
return
}
if !mw.matchContentType(req) {
mw.next.ServeHTTP(w, req)
return
}
// Read req.Body using io.TeeReader, so it can be read again
// in the actual request handler.
body, err := bodyPayload(req)
if err != nil {
e := fmt.Errorf("request body contains invalid json: %s", err)
mw.problemHandler.HandleProblem(NewProblem(w, req, e))
if !mw.continueOnProblem {
return
}
}
if errs := validate.Body(params, body); len(errs) > 0 {
me := newMultiError("request body does not match the schema", errs...)
mw.problemHandler.HandleProblem(NewProblem(w, req, me))
if !mw.continueOnProblem {
return
}
}
mw.next.ServeHTTP(w, req)
}
// matchContentType checks if content type of the request matches any selector.
func (mw *requestBodyValidator) matchContentType(req *http.Request) bool {
contentType := req.Header.Get("Content-Type")
for _, selector := range mw.jsonSelectors {
if selector.MatchString(contentType) {
return true
}
}
return false
}
// bodyPayload reads req.Body and returns it. Request body can be
// read again later.
func bodyPayload(req *http.Request) (interface{}, error) {
buf := &bytes.Buffer{}
tr := io.TeeReader(req.Body, buf)
defer req.Body.Close()
var payload interface{}
if err := json.NewDecoder(tr).Decode(&payload); err != nil {
return nil, err
}
req.Body = ioutil.NopCloser(buf)
return payload, nil
}