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api.go
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api.go
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package keystore
import (
"database/sql"
"encoding/hex"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"strings"
"time"
"github.com/rs/cors"
"github.com/lantah/go/support/errors"
"github.com/lantah/go/support/log"
"github.com/lantah/go/support/render/health"
"github.com/lantah/go/support/render/httpjson"
"github.com/lantah/go/support/render/problem"
)
func init() {
// register errors
problem.RegisterError(httpjson.ErrBadRequest, probInvalidRequest)
problem.RegisterError(sql.ErrNoRows, problem.NotFound)
// register service host as an empty string
problem.RegisterHost("")
}
func (s *Service) wrapMiddleware(handler http.Handler) http.Handler {
handler = authHandler(handler, s.authenticator)
handler = recoverHandler(handler)
handler = corsHandler(handler)
return handler
}
func ServeMux(s *Service) http.Handler {
mux := http.NewServeMux()
mux.Handle("/keys", s.wrapMiddleware(s.keysHTTPMethodHandler()))
mux.Handle("/health", s.wrapMiddleware(health.PassHandler{}))
return mux
}
func (s *Service) keysHTTPMethodHandler() http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
switch req.Method {
case http.MethodGet:
jsonHandler(s.getKeys).ServeHTTP(rw, req)
case http.MethodPut:
jsonHandler(s.putKeys).ServeHTTP(rw, req)
case http.MethodDelete:
jsonHandler(s.deleteKeys).ServeHTTP(rw, req)
default:
problem.Render(req.Context(), rw, probMethodNotAllowed)
}
})
}
type authResponse struct {
UserID string `json:"userID"`
}
var forwardHeaders = map[string]struct{}{
"authorization": {},
"cookie": {},
}
func authHandler(next http.Handler, authenticator *Authenticator) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
if authenticator == nil {
// to facilitate API testing
next.ServeHTTP(rw, req.WithContext(withUserID(req.Context(), "test-user")))
return
}
var (
proxyReq *http.Request
err error
clientIP string
)
ctx := req.Context()
// set a 5-second timeout
client := http.Client{Timeout: time.Duration(5 * time.Second)}
switch authenticator.APIType {
case REST:
proxyReq, err = http.NewRequest("GET", authenticator.URL, nil)
if err != nil {
problem.Render(ctx, rw, errors.Wrap(err, "creating the auth proxy request"))
return
}
case GraphQL:
// to be implemented later
default:
problem.Render(ctx, rw, probNotAuthorized)
return
}
proxyReq.Header = make(http.Header)
for k, v := range req.Header {
// http headers are case-insensitive
// https://www.ietf.org/rfc/rfc2616.txt
if _, ok := forwardHeaders[strings.ToLower(k)]; ok {
proxyReq.Header[k] = v
}
}
if clientIP, _, err = net.SplitHostPort(req.RemoteAddr); err == nil {
proxyReq.Header.Set("X-Forwarded-For", clientIP)
}
proxyReq.Header.Set("Accept-Encoding", "identity")
resp, err := client.Do(proxyReq)
if err != nil {
problem.Render(ctx, rw, errors.Wrap(err, "sending the auth proxy request"))
return
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
problem.Render(ctx, rw, probNotAuthorized)
return
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
problem.Render(ctx, rw, errors.Wrap(err, "reading the auth response"))
return
}
var authResp authResponse
err = json.Unmarshal(body, &authResp)
if err != nil {
log.Ctx(ctx).Infof("Response body as a plain string: %s\n. Response body as a hex dump string: %s\n", string(body), hex.Dump(body))
problem.Render(ctx, rw, errors.Wrap(err, "unmarshaling the auth response"))
return
}
if authResp.UserID == "" {
problem.Render(ctx, rw, probNotAuthorized)
return
}
next.ServeHTTP(rw, req.WithContext(withUserID(ctx, authResp.UserID)))
})
}
func jsonHandler(f interface{}) http.Handler {
h, err := httpjson.ReqBodyHandler(f, httpjson.JSON)
if err != nil {
panic(err)
}
return h
}
func recoverHandler(next http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
defer func() {
r := recover()
if r == nil {
return
}
err, ok := r.(error)
if !ok {
err = fmt.Errorf("panic: %v", r)
}
if errors.Cause(err) == http.ErrAbortHandler {
panic(err)
}
ctx := req.Context()
log.Ctx(ctx).WithStack(err).Error(err)
problem.Render(ctx, rw, err)
}()
next.ServeHTTP(rw, req)
})
}
func corsHandler(next http.Handler) http.Handler {
cors := cors.New(cors.Options{
AllowedOrigins: []string{"*"},
AllowedHeaders: []string{"*"},
AllowedMethods: []string{"GET", "PUT", "POST", "PATCH", "DELETE", "HEAD", "OPTIONS"},
})
return cors.Handler(next)
}