forked from micromdm/micromdm
/
httputil.go
126 lines (107 loc) · 3.15 KB
/
httputil.go
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package httputil
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
"strings"
"github.com/go-kit/kit/log"
httptransport "github.com/go-kit/kit/transport/http"
"github.com/gorilla/mux"
)
func NewRouter(logger log.Logger) (*mux.Router, []httptransport.ServerOption) {
r := mux.NewRouter()
options := []httptransport.ServerOption{
httptransport.ServerErrorEncoder(ErrorEncoder),
httptransport.ServerErrorLogger(logger),
httptransport.ServerBefore(httptransport.PopulateRequestContext),
}
return r, options
}
func EncodeJSONResponse(ctx context.Context, w http.ResponseWriter, response interface{}) error {
if f, ok := response.(failer); ok && f.Failed() != nil {
ErrorEncoder(ctx, f.Failed(), w)
return nil
}
if headerer, ok := response.(httptransport.Headerer); ok {
for k, values := range headerer.Headers() {
for _, v := range values {
w.Header().Add(k, v)
}
}
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
code := http.StatusOK
if sc, ok := response.(httptransport.StatusCoder); ok {
code = sc.StatusCode()
}
w.WriteHeader(code)
enc := json.NewEncoder(w)
enc.SetIndent("", " ")
return enc.Encode(response)
}
func ErrorEncoder(_ context.Context, err error, w http.ResponseWriter) {
errMap := map[string]interface{}{"error": err.Error()}
enc := json.NewEncoder(w)
enc.SetIndent("", " ")
if headerer, ok := err.(httptransport.Headerer); ok {
for k, values := range headerer.Headers() {
for _, v := range values {
w.Header().Add(k, v)
}
}
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
code := http.StatusInternalServerError
if sc, ok := err.(httptransport.StatusCoder); ok {
code = sc.StatusCode()
}
w.WriteHeader(code)
enc.Encode(errMap)
}
// failer is an interface that should be implemented by response types.
// Response encoders can check if responses are Failer, and if so if they've
// failed, and if so encode them using a separate write path based on the error.
type failer interface {
Failed() error
}
type errorWrapper struct {
Error string `json:"error"`
}
func JSONErrorDecoder(r *http.Response) error {
contentType := r.Header.Get("Content-Type")
if !strings.Contains(contentType, "application/json") {
return fmt.Errorf("expected JSON formatted error, got Content-Type %s", contentType)
}
var w errorWrapper
if err := json.NewDecoder(r.Body).Decode(&w); err != nil {
return err
}
return errors.New(w.Error)
}
func EncodeRequestWithToken(token string, next httptransport.EncodeRequestFunc) httptransport.EncodeRequestFunc {
return func(ctx context.Context, r *http.Request, request interface{}) error {
r.SetBasicAuth("micromdm", token)
return next(ctx, r, request)
}
}
func CopyURL(base *url.URL, path string) *url.URL {
next := *base
next.Path = path
return &next
}
func DecodeJSONRequest(r *http.Request, into interface{}) error {
defer r.Body.Close()
err := json.NewDecoder(r.Body).Decode(into)
return err
}
func DecodeJSONResponse(r *http.Response, into interface{}) error {
defer r.Body.Close()
if r.StatusCode != http.StatusOK {
return JSONErrorDecoder(r)
}
err := json.NewDecoder(r.Body).Decode(into)
return err
}