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103 lines
3.4 KiB
Go
103 lines
3.4 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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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 util
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import (
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"net"
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"regexp"
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)
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const qnameCharFmt string = "[A-Za-z0-9]"
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const qnameExtCharFmt string = "[-A-Za-z0-9_.]"
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const qnameTokenFmt string = "(" + qnameCharFmt + qnameExtCharFmt + "*)?" + qnameCharFmt
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const LabelValueFmt string = "(" + qnameTokenFmt + ")?"
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const LabelValueMaxLength int = 63
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var labelValueRegexp = regexp.MustCompile("^" + LabelValueFmt + "$")
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func IsValidLabelValue(value string) bool {
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return (len(value) <= LabelValueMaxLength && labelValueRegexp.MatchString(value))
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}
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// Annotation values are opaque.
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func IsValidAnnotationValue(value string) bool {
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return true
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}
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const QualifiedNameFmt string = "(" + qnameTokenFmt + "/)?" + qnameTokenFmt
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const QualifiedNameMaxLength int = 253
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var qualifiedNameRegexp = regexp.MustCompile("^" + QualifiedNameFmt + "$")
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func IsQualifiedName(value string) bool {
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return (len(value) <= QualifiedNameMaxLength && qualifiedNameRegexp.MatchString(value))
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}
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const DNS1123LabelFmt string = "[a-z0-9]([-a-z0-9]*[a-z0-9])?"
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const DNS1123LabelMaxLength int = 63
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var dns1123LabelRegexp = regexp.MustCompile("^" + DNS1123LabelFmt + "$")
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// IsDNS1123Label tests for a string that conforms to the definition of a label in
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// DNS (RFC 1123).
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func IsDNS1123Label(value string) bool {
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return len(value) <= DNS1123LabelMaxLength && dns1123LabelRegexp.MatchString(value)
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}
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const DNS1123SubdomainFmt string = DNS1123LabelFmt + "(\\." + DNS1123LabelFmt + ")*"
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const DNS1123SubdomainMaxLength int = 253
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var dns1123SubdomainRegexp = regexp.MustCompile("^" + DNS1123SubdomainFmt + "$")
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// IsDNS1123Subdomain tests for a string that conforms to the definition of a
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// subdomain in DNS (RFC 1123).
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func IsDNS1123Subdomain(value string) bool {
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return len(value) <= DNS1123SubdomainMaxLength && dns1123SubdomainRegexp.MatchString(value)
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}
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const DNS952LabelFmt string = "[a-z]([-a-z0-9]*[a-z0-9])?"
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const DNS952LabelMaxLength int = 24
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var dns952LabelRegexp = regexp.MustCompile("^" + DNS952LabelFmt + "$")
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// IsDNS952Label tests for a string that conforms to the definition of a label in
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// DNS (RFC 952).
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func IsDNS952Label(value string) bool {
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return len(value) <= DNS952LabelMaxLength && dns952LabelRegexp.MatchString(value)
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}
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const CIdentifierFmt string = "[A-Za-z_][A-Za-z0-9_]*"
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var cIdentifierRegexp = regexp.MustCompile("^" + CIdentifierFmt + "$")
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// IsCIdentifier tests for a string that conforms the definition of an identifier
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// in C. This checks the format, but not the length.
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func IsCIdentifier(value string) bool {
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return cIdentifierRegexp.MatchString(value)
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}
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// IsValidPortNum tests that the argument is a valid, non-zero port number.
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func IsValidPortNum(port int) bool {
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return 0 < port && port < 65536
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}
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// IsValidIP tests that the argument is a valid IPv4 address.
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func IsValidIP(value string) bool {
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return net.ParseIP(value) != nil && net.ParseIP(value).To4() != nil
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}
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