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http.go
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http.go
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package utils
import (
"fmt"
"net/http"
"time"
ctxu "github.com/docker/distribution/context"
"github.com/docker/distribution/registry/api/errcode"
"github.com/docker/distribution/registry/auth"
"github.com/docker/notary"
"github.com/docker/notary/tuf/signed"
"github.com/gorilla/mux"
"golang.org/x/net/context"
)
// ContextHandler defines an alterate HTTP handler interface which takes in
// a context for authorization and returns an HTTP application error.
type ContextHandler func(ctx context.Context, w http.ResponseWriter, r *http.Request) error
// rootHandler is an implementation of an HTTP request handler which handles
// authorization and calling out to the defined alternate http handler.
type rootHandler struct {
handler ContextHandler
auth auth.AccessController
actions []string
context context.Context
trust signed.CryptoService
//cachePool redis.Pool
}
// RootHandlerFactory creates a new rootHandler factory using the given
// Context creator and authorizer. The returned factory allows creating
// new rootHandlers from the alternate http handler contextHandler and
// a scope.
func RootHandlerFactory(ctx context.Context, auth auth.AccessController, trust signed.CryptoService) func(ContextHandler, ...string) *rootHandler {
return func(handler ContextHandler, actions ...string) *rootHandler {
return &rootHandler{
handler: handler,
auth: auth,
actions: actions,
context: ctx,
trust: trust,
}
}
}
// ServeHTTP serves an HTTP request and implements the http.Handler interface.
func (root *rootHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
ctx := ctxu.WithRequest(root.context, r)
log := ctxu.GetRequestLogger(ctx)
ctx, w = ctxu.WithResponseWriter(ctx, w)
ctx = ctxu.WithLogger(ctx, log)
ctx = context.WithValue(ctx, notary.CtxKeyRepo, vars["imageName"])
ctx = context.WithValue(ctx, notary.CtxKeyCryptoSvc, root.trust)
defer func() {
ctxu.GetResponseLogger(ctx).Info("response completed")
}()
if root.auth != nil {
access := buildAccessRecords(vars["imageName"], root.actions...)
var authCtx context.Context
var err error
if authCtx, err = root.auth.Authorized(ctx, access...); err != nil {
if challenge, ok := err.(auth.Challenge); ok {
// Let the challenge write the response.
challenge.SetHeaders(w)
if err := errcode.ServeJSON(w, errcode.ErrorCodeUnauthorized.WithDetail(access)); err != nil {
log.Errorf("failed to serve challenge response: %s", err.Error())
}
return
}
errcode.ServeJSON(w, errcode.ErrorCodeUnauthorized)
return
}
ctx = authCtx
}
if err := root.handler(ctx, w, r); err != nil {
if httpErr, ok := err.(errcode.ErrorCoder); ok {
// info level logging for non-5XX http errors
httpErrCode := httpErr.ErrorCode().Descriptor().HTTPStatusCode
if httpErrCode >= http.StatusInternalServerError {
// error level logging for 5XX http errors
log.Error(httpErr)
} else {
log.Info(httpErr)
}
}
e := errcode.ServeJSON(w, err)
if e != nil {
log.Error(e)
}
return
}
}
func buildAccessRecords(repo string, actions ...string) []auth.Access {
requiredAccess := make([]auth.Access, 0, len(actions))
for _, action := range actions {
requiredAccess = append(requiredAccess, auth.Access{
Resource: auth.Resource{
Type: "repository",
Name: repo,
},
Action: action,
})
}
return requiredAccess
}
// CacheControlConfig is an interface for something that knows how to set cache
// control headers
type CacheControlConfig interface {
// SetHeaders will actually set the cache control headers on a Headers object
SetHeaders(headers http.Header)
}
// NewCacheControlConfig returns CacheControlConfig interface for either setting
// cache control or disabling cache control entirely
func NewCacheControlConfig(maxAgeInSeconds int, mustRevalidate bool) CacheControlConfig {
if maxAgeInSeconds > 0 {
return PublicCacheControl{MustReValidate: mustRevalidate, MaxAgeInSeconds: maxAgeInSeconds}
}
return NoCacheControl{}
}
// PublicCacheControl is a set of options that we will set to enable cache control
type PublicCacheControl struct {
MustReValidate bool
MaxAgeInSeconds int
}
// SetHeaders sets the public headers with an optional must-revalidate header
func (p PublicCacheControl) SetHeaders(headers http.Header) {
cacheControlValue := fmt.Sprintf("public, max-age=%v, s-maxage=%v",
p.MaxAgeInSeconds, p.MaxAgeInSeconds)
if p.MustReValidate {
cacheControlValue = fmt.Sprintf("%s, must-revalidate", cacheControlValue)
}
headers.Set("Cache-Control", cacheControlValue)
// delete the Pragma directive, because the only valid value in HTTP is
// "no-cache"
headers.Del("Pragma")
if headers.Get("Last-Modified") == "" {
SetLastModifiedHeader(headers, time.Time{})
}
}
// NoCacheControl is an object which represents a directive to cache nothing
type NoCacheControl struct{}
// SetHeaders sets the public headers cache-control headers and pragma to no-cache
func (n NoCacheControl) SetHeaders(headers http.Header) {
headers.Set("Cache-Control", "max-age=0, no-cache, no-store")
headers.Set("Pragma", "no-cache")
}
// cacheControlResponseWriter wraps an existing response writer, and if Write is
// called, will try to set the cache control headers if it can
type cacheControlResponseWriter struct {
http.ResponseWriter
config CacheControlConfig
statusCode int
}
// WriteHeader stores the header before writing it, so we can tell if it's been set
// to a non-200 status code
func (c *cacheControlResponseWriter) WriteHeader(statusCode int) {
c.statusCode = statusCode
c.ResponseWriter.WriteHeader(statusCode)
}
// Write will set the cache headers if they haven't already been set and if the status
// code has either not been set or set to 200
func (c *cacheControlResponseWriter) Write(data []byte) (int, error) {
if c.statusCode == http.StatusOK || c.statusCode == 0 {
headers := c.ResponseWriter.Header()
if headers.Get("Cache-Control") == "" {
c.config.SetHeaders(headers)
}
}
return c.ResponseWriter.Write(data)
}
type cacheControlHandler struct {
http.Handler
config CacheControlConfig
}
func (c cacheControlHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
c.Handler.ServeHTTP(&cacheControlResponseWriter{ResponseWriter: w, config: c.config}, r)
}
// WrapWithCacheHandler wraps another handler in one that can add cache control headers
// given a 200 response
func WrapWithCacheHandler(ccc CacheControlConfig, handler http.Handler) http.Handler {
if ccc != nil {
return cacheControlHandler{Handler: handler, config: ccc}
}
return handler
}
// SetLastModifiedHeader takes a time and uses it to set the LastModified header using
// the right date format
func SetLastModifiedHeader(headers http.Header, lmt time.Time) {
headers.Set("Last-Modified", lmt.Format(time.RFC1123))
}