mirror of
https://github.com/ceph/ceph-csi.git
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275 lines
9.8 KiB
Go
275 lines
9.8 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package request
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import (
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"context"
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"fmt"
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"net/http"
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"strings"
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"k8s.io/apimachinery/pkg/api/validation/path"
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metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
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metainternalversionscheme "k8s.io/apimachinery/pkg/apis/meta/internalversion/scheme"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/klog/v2"
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)
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// LongRunningRequestCheck is a predicate which is true for long-running http requests.
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type LongRunningRequestCheck func(r *http.Request, requestInfo *RequestInfo) bool
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type RequestInfoResolver interface {
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NewRequestInfo(req *http.Request) (*RequestInfo, error)
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}
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// RequestInfo holds information parsed from the http.Request
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type RequestInfo struct {
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// IsResourceRequest indicates whether or not the request is for an API resource or subresource
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IsResourceRequest bool
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// Path is the URL path of the request
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Path string
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// Verb is the kube verb associated with the request for API requests, not the http verb. This includes things like list and watch.
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// for non-resource requests, this is the lowercase http verb
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Verb string
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APIPrefix string
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APIGroup string
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APIVersion string
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Namespace string
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// Resource is the name of the resource being requested. This is not the kind. For example: pods
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Resource string
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// Subresource is the name of the subresource being requested. This is a different resource, scoped to the parent resource, but it may have a different kind.
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// For instance, /pods has the resource "pods" and the kind "Pod", while /pods/foo/status has the resource "pods", the sub resource "status", and the kind "Pod"
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// (because status operates on pods). The binding resource for a pod though may be /pods/foo/binding, which has resource "pods", subresource "binding", and kind "Binding".
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Subresource string
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// Name is empty for some verbs, but if the request directly indicates a name (not in body content) then this field is filled in.
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Name string
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// Parts are the path parts for the request, always starting with /{resource}/{name}
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Parts []string
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}
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// specialVerbs contains just strings which are used in REST paths for special actions that don't fall under the normal
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// CRUDdy GET/POST/PUT/DELETE actions on REST objects.
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// TODO: find a way to keep this up to date automatically. Maybe dynamically populate list as handlers added to
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// master's Mux.
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var specialVerbs = sets.NewString("proxy", "watch")
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// specialVerbsNoSubresources contains root verbs which do not allow subresources
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var specialVerbsNoSubresources = sets.NewString("proxy")
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// namespaceSubresources contains subresources of namespace
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// this list allows the parser to distinguish between a namespace subresource, and a namespaced resource
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var namespaceSubresources = sets.NewString("status", "finalize")
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// NamespaceSubResourcesForTest exports namespaceSubresources for testing in pkg/controlplane/master_test.go, so we never drift
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var NamespaceSubResourcesForTest = sets.NewString(namespaceSubresources.List()...)
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type RequestInfoFactory struct {
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APIPrefixes sets.String // without leading and trailing slashes
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GrouplessAPIPrefixes sets.String // without leading and trailing slashes
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}
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// TODO write an integration test against the swagger doc to test the RequestInfo and match up behavior to responses
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// NewRequestInfo returns the information from the http request. If error is not nil, RequestInfo holds the information as best it is known before the failure
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// It handles both resource and non-resource requests and fills in all the pertinent information for each.
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// Valid Inputs:
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// Resource paths
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// /apis/{api-group}/{version}/namespaces
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// /api/{version}/namespaces
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// /api/{version}/namespaces/{namespace}
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// /api/{version}/namespaces/{namespace}/{resource}
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// /api/{version}/namespaces/{namespace}/{resource}/{resourceName}
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// /api/{version}/{resource}
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// /api/{version}/{resource}/{resourceName}
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//
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// Special verbs without subresources:
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// /api/{version}/proxy/{resource}/{resourceName}
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// /api/{version}/proxy/namespaces/{namespace}/{resource}/{resourceName}
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//
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// Special verbs with subresources:
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// /api/{version}/watch/{resource}
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// /api/{version}/watch/namespaces/{namespace}/{resource}
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//
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// NonResource paths
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// /apis/{api-group}/{version}
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// /apis/{api-group}
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// /apis
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// /api/{version}
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// /api
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// /healthz
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// /
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func (r *RequestInfoFactory) NewRequestInfo(req *http.Request) (*RequestInfo, error) {
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// start with a non-resource request until proven otherwise
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requestInfo := RequestInfo{
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IsResourceRequest: false,
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Path: req.URL.Path,
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Verb: strings.ToLower(req.Method),
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}
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currentParts := splitPath(req.URL.Path)
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if len(currentParts) < 3 {
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// return a non-resource request
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return &requestInfo, nil
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}
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if !r.APIPrefixes.Has(currentParts[0]) {
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// return a non-resource request
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return &requestInfo, nil
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}
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requestInfo.APIPrefix = currentParts[0]
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currentParts = currentParts[1:]
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if !r.GrouplessAPIPrefixes.Has(requestInfo.APIPrefix) {
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// one part (APIPrefix) has already been consumed, so this is actually "do we have four parts?"
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if len(currentParts) < 3 {
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// return a non-resource request
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return &requestInfo, nil
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}
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requestInfo.APIGroup = currentParts[0]
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currentParts = currentParts[1:]
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}
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requestInfo.IsResourceRequest = true
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requestInfo.APIVersion = currentParts[0]
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currentParts = currentParts[1:]
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// handle input of form /{specialVerb}/*
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if specialVerbs.Has(currentParts[0]) {
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if len(currentParts) < 2 {
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return &requestInfo, fmt.Errorf("unable to determine kind and namespace from url, %v", req.URL)
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}
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requestInfo.Verb = currentParts[0]
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currentParts = currentParts[1:]
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} else {
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switch req.Method {
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case "POST":
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requestInfo.Verb = "create"
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case "GET", "HEAD":
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requestInfo.Verb = "get"
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case "PUT":
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requestInfo.Verb = "update"
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case "PATCH":
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requestInfo.Verb = "patch"
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case "DELETE":
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requestInfo.Verb = "delete"
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default:
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requestInfo.Verb = ""
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}
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}
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// URL forms: /namespaces/{namespace}/{kind}/*, where parts are adjusted to be relative to kind
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if currentParts[0] == "namespaces" {
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if len(currentParts) > 1 {
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requestInfo.Namespace = currentParts[1]
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// if there is another step after the namespace name and it is not a known namespace subresource
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// move currentParts to include it as a resource in its own right
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if len(currentParts) > 2 && !namespaceSubresources.Has(currentParts[2]) {
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currentParts = currentParts[2:]
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}
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}
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} else {
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requestInfo.Namespace = metav1.NamespaceNone
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}
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// parsing successful, so we now know the proper value for .Parts
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requestInfo.Parts = currentParts
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// parts look like: resource/resourceName/subresource/other/stuff/we/don't/interpret
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switch {
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case len(requestInfo.Parts) >= 3 && !specialVerbsNoSubresources.Has(requestInfo.Verb):
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requestInfo.Subresource = requestInfo.Parts[2]
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fallthrough
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case len(requestInfo.Parts) >= 2:
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requestInfo.Name = requestInfo.Parts[1]
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fallthrough
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case len(requestInfo.Parts) >= 1:
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requestInfo.Resource = requestInfo.Parts[0]
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}
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// if there's no name on the request and we thought it was a get before, then the actual verb is a list or a watch
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if len(requestInfo.Name) == 0 && requestInfo.Verb == "get" {
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opts := metainternalversion.ListOptions{}
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if err := metainternalversionscheme.ParameterCodec.DecodeParameters(req.URL.Query(), metav1.SchemeGroupVersion, &opts); err != nil {
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// An error in parsing request will result in default to "list" and not setting "name" field.
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klog.ErrorS(err, "Couldn't parse request", "request", req.URL.Query())
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// Reset opts to not rely on partial results from parsing.
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// However, if watch is set, let's report it.
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opts = metainternalversion.ListOptions{}
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if values := req.URL.Query()["watch"]; len(values) > 0 {
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switch strings.ToLower(values[0]) {
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case "false", "0":
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default:
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opts.Watch = true
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}
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}
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}
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if opts.Watch {
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requestInfo.Verb = "watch"
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} else {
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requestInfo.Verb = "list"
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}
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if opts.FieldSelector != nil {
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if name, ok := opts.FieldSelector.RequiresExactMatch("metadata.name"); ok {
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if len(path.IsValidPathSegmentName(name)) == 0 {
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requestInfo.Name = name
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}
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}
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}
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}
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// if there's no name on the request and we thought it was a delete before, then the actual verb is deletecollection
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if len(requestInfo.Name) == 0 && requestInfo.Verb == "delete" {
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requestInfo.Verb = "deletecollection"
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}
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return &requestInfo, nil
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}
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type requestInfoKeyType int
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// requestInfoKey is the RequestInfo key for the context. It's of private type here. Because
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// keys are interfaces and interfaces are equal when the type and the value is equal, this
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// does not conflict with the keys defined in pkg/api.
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const requestInfoKey requestInfoKeyType = iota
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// WithRequestInfo returns a copy of parent in which the request info value is set
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func WithRequestInfo(parent context.Context, info *RequestInfo) context.Context {
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return WithValue(parent, requestInfoKey, info)
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}
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// RequestInfoFrom returns the value of the RequestInfo key on the ctx
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func RequestInfoFrom(ctx context.Context) (*RequestInfo, bool) {
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info, ok := ctx.Value(requestInfoKey).(*RequestInfo)
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return info, ok
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}
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// splitPath returns the segments for a URL path.
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func splitPath(path string) []string {
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path = strings.Trim(path, "/")
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if path == "" {
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return []string{}
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}
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return strings.Split(path, "/")
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}
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