mirror of
https://github.com/ceph/ceph-csi.git
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237 lines
7.8 KiB
Go
237 lines
7.8 KiB
Go
/*
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Copyright 2022 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 library
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import (
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"net/url"
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"github.com/google/cel-go/cel"
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"github.com/google/cel-go/common/types"
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"github.com/google/cel-go/common/types/ref"
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apiservercel "k8s.io/apiserver/pkg/cel"
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)
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// URLs provides a CEL function library extension of URL parsing functions.
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//
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// url
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//
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// Converts a string to a URL or results in an error if the string is not a valid URL. The URL must be an absolute URI
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// or an absolute path.
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//
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// url(<string>) <URL>
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//
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// Examples:
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//
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// url('https://user:pass@example.com:80/path?query=val#fragment') // returns a URL
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// url('/absolute-path') // returns a URL
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// url('https://a:b:c/') // error
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// url('../relative-path') // error
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//
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// isURL
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//
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// Returns true if a string is a valid URL. The URL must be an absolute URI or an absolute path.
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//
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// isURL( <string>) <bool>
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//
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// Examples:
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//
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// isURL('https://user:pass@example.com:80/path?query=val#fragment') // returns true
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// isURL('/absolute-path') // returns true
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// isURL('https://a:b:c/') // returns false
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// isURL('../relative-path') // returns false
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//
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// getScheme / getHost / getHostname / getPort / getEscapedPath / getQuery
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//
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// Return the parsed components of a URL.
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//
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// - getScheme: If absent in the URL, returns an empty string.
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//
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// - getHostname: IPv6 addresses are returned without braces, e.g. "::1". If absent in the URL, returns an empty string.
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//
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// - getHost: IPv6 addresses are returned with braces, e.g. "[::1]". If absent in the URL, returns an empty string.
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//
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// - getEscapedPath: The string returned by getEscapedPath is URL escaped, e.g. "with space" becomes "with%20space".
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// If absent in the URL, returns an empty string.
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//
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// - getPort: If absent in the URL, returns an empty string.
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//
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// - getQuery: Returns the query parameters in "matrix" form where a repeated query key is interpreted to
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// mean that there are multiple values for that key. The keys and values are returned unescaped.
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// If absent in the URL, returns an empty map.
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//
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// <URL>.getScheme() <string>
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// <URL>.getHost() <string>
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// <URL>.getHostname() <string>
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// <URL>.getPort() <string>
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// <URL>.getEscapedPath() <string>
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// <URL>.getQuery() <map <string>, <list <string>>
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//
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// Examples:
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//
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// url('/path').getScheme() // returns ''
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// url('https://example.com/').getScheme() // returns 'https'
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// url('https://example.com:80/').getHost() // returns 'example.com:80'
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// url('https://example.com/').getHost() // returns 'example.com'
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// url('https://[::1]:80/').getHost() // returns '[::1]:80'
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// url('https://[::1]/').getHost() // returns '[::1]'
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// url('/path').getHost() // returns ''
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// url('https://example.com:80/').getHostname() // returns 'example.com'
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// url('https://127.0.0.1:80/').getHostname() // returns '127.0.0.1'
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// url('https://[::1]:80/').getHostname() // returns '::1'
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// url('/path').getHostname() // returns ''
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// url('https://example.com:80/').getPort() // returns '80'
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// url('https://example.com/').getPort() // returns ''
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// url('/path').getPort() // returns ''
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// url('https://example.com/path').getEscapedPath() // returns '/path'
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// url('https://example.com/path with spaces/').getEscapedPath() // returns '/path%20with%20spaces/'
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// url('https://example.com').getEscapedPath() // returns ''
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// url('https://example.com/path?k1=a&k2=b&k2=c').getQuery() // returns { 'k1': ['a'], 'k2': ['b', 'c']}
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// url('https://example.com/path?key with spaces=value with spaces').getQuery() // returns { 'key with spaces': ['value with spaces']}
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// url('https://example.com/path?').getQuery() // returns {}
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// url('https://example.com/path').getQuery() // returns {}
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func URLs() cel.EnvOption {
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return cel.Lib(urlsLib)
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}
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var urlsLib = &urls{}
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type urls struct{}
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var urlLibraryDecls = map[string][]cel.FunctionOpt{
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"url": {
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cel.Overload("string_to_url", []*cel.Type{cel.StringType}, apiservercel.URLType,
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cel.UnaryBinding(stringToUrl))},
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"getScheme": {
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cel.MemberOverload("url_get_scheme", []*cel.Type{apiservercel.URLType}, cel.StringType,
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cel.UnaryBinding(getScheme))},
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"getHost": {
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cel.MemberOverload("url_get_host", []*cel.Type{apiservercel.URLType}, cel.StringType,
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cel.UnaryBinding(getHost))},
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"getHostname": {
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cel.MemberOverload("url_get_hostname", []*cel.Type{apiservercel.URLType}, cel.StringType,
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cel.UnaryBinding(getHostname))},
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"getPort": {
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cel.MemberOverload("url_get_port", []*cel.Type{apiservercel.URLType}, cel.StringType,
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cel.UnaryBinding(getPort))},
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"getEscapedPath": {
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cel.MemberOverload("url_get_escaped_path", []*cel.Type{apiservercel.URLType}, cel.StringType,
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cel.UnaryBinding(getEscapedPath))},
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"getQuery": {
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cel.MemberOverload("url_get_query", []*cel.Type{apiservercel.URLType},
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cel.MapType(cel.StringType, cel.ListType(cel.StringType)),
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cel.UnaryBinding(getQuery))},
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"isURL": {
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cel.Overload("is_url_string", []*cel.Type{cel.StringType}, cel.BoolType,
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cel.UnaryBinding(isURL))},
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}
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func (*urls) CompileOptions() []cel.EnvOption {
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options := []cel.EnvOption{}
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for name, overloads := range urlLibraryDecls {
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options = append(options, cel.Function(name, overloads...))
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}
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return options
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}
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func (*urls) ProgramOptions() []cel.ProgramOption {
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return []cel.ProgramOption{}
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}
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func stringToUrl(arg ref.Val) ref.Val {
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s, ok := arg.Value().(string)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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// Use ParseRequestURI to check the URL before conversion.
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// ParseRequestURI requires absolute URLs and is used by the OpenAPIv3 'uri' format.
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_, err := url.ParseRequestURI(s)
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if err != nil {
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return types.NewErr("URL parse error during conversion from string: %v", err)
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}
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// We must parse again with Parse since ParseRequestURI incorrectly parses URLs that contain a fragment
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// part and will incorrectly append the fragment to either the path or the query, depending on which it was adjacent to.
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u, err := url.Parse(s)
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if err != nil {
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// Errors are not expected here since Parse is a more lenient parser than ParseRequestURI.
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return types.NewErr("URL parse error during conversion from string: %v", err)
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}
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return apiservercel.URL{URL: u}
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}
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func getScheme(arg ref.Val) ref.Val {
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u, ok := arg.Value().(*url.URL)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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return types.String(u.Scheme)
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}
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func getHost(arg ref.Val) ref.Val {
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u, ok := arg.Value().(*url.URL)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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return types.String(u.Host)
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}
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func getHostname(arg ref.Val) ref.Val {
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u, ok := arg.Value().(*url.URL)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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return types.String(u.Hostname())
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}
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func getPort(arg ref.Val) ref.Val {
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u, ok := arg.Value().(*url.URL)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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return types.String(u.Port())
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}
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func getEscapedPath(arg ref.Val) ref.Val {
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u, ok := arg.Value().(*url.URL)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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return types.String(u.EscapedPath())
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}
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func getQuery(arg ref.Val) ref.Val {
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u, ok := arg.Value().(*url.URL)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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result := map[ref.Val]ref.Val{}
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for k, v := range u.Query() {
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result[types.String(k)] = types.NewStringList(types.DefaultTypeAdapter, v)
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}
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return types.NewRefValMap(types.DefaultTypeAdapter, result)
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}
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func isURL(arg ref.Val) ref.Val {
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s, ok := arg.Value().(string)
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if !ok {
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return types.MaybeNoSuchOverloadErr(arg)
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}
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_, err := url.ParseRequestURI(s)
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return types.Bool(err == nil)
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}
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