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transport.go
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transport.go
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
package api
import (
"context"
"encoding/json"
"net/http"
"github.com/MainfluxLabs/mainflux"
"github.com/MainfluxLabs/mainflux/certs"
"github.com/MainfluxLabs/mainflux/internal/apiutil"
"github.com/MainfluxLabs/mainflux/logger"
"github.com/MainfluxLabs/mainflux/pkg/errors"
kithttp "github.com/go-kit/kit/transport/http"
"github.com/go-zoo/bone"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
const (
contentType = "application/json"
offsetKey = "offset"
limitKey = "limit"
defOffset = 0
defLimit = 10
)
// MakeHandler returns a HTTP handler for API endpoints.
func MakeHandler(svc certs.Service, logger logger.Logger) http.Handler {
opts := []kithttp.ServerOption{
kithttp.ServerErrorEncoder(apiutil.LoggingErrorEncoder(logger, encodeError)),
}
r := bone.New()
r.Post("/certs", kithttp.NewServer(
issueCert(svc),
decodeCerts,
encodeResponse,
opts...,
))
r.Get("/certs/:certId", kithttp.NewServer(
viewCert(svc),
decodeViewCert,
encodeResponse,
opts...,
))
r.Delete("/certs/:certId", kithttp.NewServer(
revokeCert(svc),
decodeRevokeCerts,
encodeResponse,
opts...,
))
r.Get("/serials/:thingId", kithttp.NewServer(
listSerials(svc),
decodeListCerts,
encodeResponse,
opts...,
))
r.Handle("/metrics", promhttp.Handler())
r.GetFunc("/health", mainflux.Health("certs"))
return r
}
func encodeResponse(_ context.Context, w http.ResponseWriter, response interface{}) error {
w.Header().Set("Content-Type", contentType)
if ar, ok := response.(mainflux.Response); ok {
for k, v := range ar.Headers() {
w.Header().Set(k, v)
}
w.WriteHeader(ar.Code())
if ar.Empty() {
return nil
}
}
return json.NewEncoder(w).Encode(response)
}
func decodeListCerts(_ context.Context, r *http.Request) (interface{}, error) {
l, err := apiutil.ReadUintQuery(r, limitKey, defLimit)
if err != nil {
return nil, err
}
o, err := apiutil.ReadUintQuery(r, offsetKey, defOffset)
if err != nil {
return nil, err
}
req := listReq{
token: apiutil.ExtractBearerToken(r),
thingID: bone.GetValue(r, "thingId"),
limit: l,
offset: o,
}
return req, nil
}
func decodeViewCert(_ context.Context, r *http.Request) (interface{}, error) {
req := viewReq{
token: apiutil.ExtractBearerToken(r),
serialID: bone.GetValue(r, "certId"),
}
return req, nil
}
func decodeCerts(_ context.Context, r *http.Request) (interface{}, error) {
if r.Header.Get("Content-Type") != contentType {
return nil, apiutil.ErrUnsupportedContentType
}
req := addCertsReq{token: apiutil.ExtractBearerToken(r)}
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
return nil, err
}
return req, nil
}
func decodeRevokeCerts(_ context.Context, r *http.Request) (interface{}, error) {
req := revokeReq{
token: apiutil.ExtractBearerToken(r),
certID: bone.GetValue(r, "certId"),
}
return req, nil
}
func encodeError(_ context.Context, err error, w http.ResponseWriter) {
switch {
case errors.Contains(err, errors.ErrAuthentication),
err == apiutil.ErrBearerToken:
w.WriteHeader(http.StatusUnauthorized)
case errors.Contains(err, apiutil.ErrUnsupportedContentType):
w.WriteHeader(http.StatusUnsupportedMediaType)
case errors.Contains(err, apiutil.ErrMalformedEntity),
err == apiutil.ErrMissingID,
err == apiutil.ErrMissingCertData,
err == apiutil.ErrLimitSize:
w.WriteHeader(http.StatusBadRequest)
case errors.Contains(err, errors.ErrConflict):
w.WriteHeader(http.StatusConflict)
case errors.Contains(err, errors.ErrCreateEntity),
errors.Contains(err, errors.ErrRetrieveEntity),
errors.Contains(err, errors.ErrRemoveEntity):
w.WriteHeader(http.StatusInternalServerError)
default:
w.WriteHeader(http.StatusInternalServerError)
}
if errorVal, ok := err.(errors.Error); ok {
w.Header().Set("Content-Type", contentType)
if err := json.NewEncoder(w).Encode(apiutil.ErrorRes{Err: errorVal.Msg()}); err != nil {
w.WriteHeader(http.StatusInternalServerError)
}
}
}