343 lines
12 KiB
Go
343 lines
12 KiB
Go
/*
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Copyright 2014 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 validation
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import (
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"fmt"
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"math"
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"net"
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"regexp"
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"strings"
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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 qualifiedNameFmt string = "(" + qnameCharFmt + qnameExtCharFmt + "*)?" + qnameCharFmt
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const qualifiedNameErrMsg string = "must consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character"
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const qualifiedNameMaxLength int = 63
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var qualifiedNameRegexp = regexp.MustCompile("^" + qualifiedNameFmt + "$")
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// IsQualifiedName tests whether the value passed is what Kubernetes calls a
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// "qualified name". This is a format used in various places throughout the
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// system. If the value is not valid, a list of error strings is returned.
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// Otherwise an empty list (or nil) is returned.
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func IsQualifiedName(value string) []string {
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var errs []string
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parts := strings.Split(value, "/")
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var name string
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switch len(parts) {
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case 1:
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name = parts[0]
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case 2:
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var prefix string
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prefix, name = parts[0], parts[1]
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if len(prefix) == 0 {
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errs = append(errs, "prefix part "+EmptyError())
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} else if msgs := IsDNS1123Subdomain(prefix); len(msgs) != 0 {
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errs = append(errs, prefixEach(msgs, "prefix part ")...)
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}
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default:
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return append(errs, "a qualified name "+RegexError(qualifiedNameErrMsg, qualifiedNameFmt, "MyName", "my.name", "123-abc")+
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" with an optional DNS subdomain prefix and '/' (e.g. 'example.com/MyName')")
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}
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if len(name) == 0 {
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errs = append(errs, "name part "+EmptyError())
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} else if len(name) > qualifiedNameMaxLength {
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errs = append(errs, "name part "+MaxLenError(qualifiedNameMaxLength))
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}
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if !qualifiedNameRegexp.MatchString(name) {
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errs = append(errs, "name part "+RegexError(qualifiedNameErrMsg, qualifiedNameFmt, "MyName", "my.name", "123-abc"))
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}
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return errs
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}
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const labelValueFmt string = "(" + qualifiedNameFmt + ")?"
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const labelValueErrMsg string = "a valid label must be an empty string or consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character"
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const LabelValueMaxLength int = 63
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var labelValueRegexp = regexp.MustCompile("^" + labelValueFmt + "$")
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// IsValidLabelValue tests whether the value passed is a valid label value. If
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// the value is not valid, a list of error strings is returned. Otherwise an
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// empty list (or nil) is returned.
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func IsValidLabelValue(value string) []string {
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var errs []string
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if len(value) > LabelValueMaxLength {
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errs = append(errs, MaxLenError(LabelValueMaxLength))
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}
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if !labelValueRegexp.MatchString(value) {
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errs = append(errs, RegexError(labelValueErrMsg, labelValueFmt, "MyValue", "my_value", "12345"))
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}
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return errs
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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 dns1123LabelErrMsg string = "a DNS-1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character"
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const DNS1123LabelMaxLength int = 63
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var dns1123LabelRegexp = regexp.MustCompile("^" + dns1123LabelFmt + "$")
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// IsDNS1123Label tests for a string that conforms to the definition of a label in
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// DNS (RFC 1123).
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func IsDNS1123Label(value string) []string {
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var errs []string
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if len(value) > DNS1123LabelMaxLength {
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errs = append(errs, MaxLenError(DNS1123LabelMaxLength))
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}
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if !dns1123LabelRegexp.MatchString(value) {
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errs = append(errs, RegexError(dns1123LabelErrMsg, dns1123LabelFmt, "my-name", "123-abc"))
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}
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return errs
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}
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const dns1123SubdomainFmt string = dns1123LabelFmt + "(\\." + dns1123LabelFmt + ")*"
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const dns1123SubdomainErrorMsg string = "a DNS-1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character"
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const DNS1123SubdomainMaxLength int = 253
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var dns1123SubdomainRegexp = regexp.MustCompile("^" + dns1123SubdomainFmt + "$")
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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) []string {
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var errs []string
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if len(value) > DNS1123SubdomainMaxLength {
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errs = append(errs, MaxLenError(DNS1123SubdomainMaxLength))
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}
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if !dns1123SubdomainRegexp.MatchString(value) {
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errs = append(errs, RegexError(dns1123SubdomainErrorMsg, dns1123SubdomainFmt, "example.com"))
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}
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return errs
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}
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const dns1035LabelFmt string = "[a-z]([-a-z0-9]*[a-z0-9])?"
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const dns1035LabelErrMsg string = "a DNS-1035 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character"
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const DNS1035LabelMaxLength int = 63
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var dns1035LabelRegexp = regexp.MustCompile("^" + dns1035LabelFmt + "$")
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// IsDNS1035Label tests for a string that conforms to the definition of a label in
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// DNS (RFC 1035).
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func IsDNS1035Label(value string) []string {
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var errs []string
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if len(value) > DNS1035LabelMaxLength {
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errs = append(errs, MaxLenError(DNS1035LabelMaxLength))
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}
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if !dns1035LabelRegexp.MatchString(value) {
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errs = append(errs, RegexError(dns1035LabelErrMsg, dns1035LabelFmt, "my-name", "abc-123"))
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}
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return errs
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}
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// wildcard definition - RFC 1034 section 4.3.3.
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// examples:
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// - valid: *.bar.com, *.foo.bar.com
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// - invalid: *.*.bar.com, *.foo.*.com, *bar.com, f*.bar.com, *
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const wildcardDNS1123SubdomainFmt = "\\*\\." + dns1123SubdomainFmt
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const wildcardDNS1123SubdomainErrMsg = "a wildcard DNS-1123 subdomain must start with '*.', followed by a valid DNS subdomain, which must consist of lower case alphanumeric characters, '-' or '.' and end with an alphanumeric character"
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// IsWildcardDNS1123Subdomain tests for a string that conforms to the definition of a
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// wildcard subdomain in DNS (RFC 1034 section 4.3.3).
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func IsWildcardDNS1123Subdomain(value string) []string {
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wildcardDNS1123SubdomainRegexp := regexp.MustCompile("^" + wildcardDNS1123SubdomainFmt + "$")
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var errs []string
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if len(value) > DNS1123SubdomainMaxLength {
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errs = append(errs, MaxLenError(DNS1123SubdomainMaxLength))
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}
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if !wildcardDNS1123SubdomainRegexp.MatchString(value) {
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errs = append(errs, RegexError(wildcardDNS1123SubdomainErrMsg, wildcardDNS1123SubdomainFmt, "*.example.com"))
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}
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return errs
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}
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const cIdentifierFmt string = "[A-Za-z_][A-Za-z0-9_]*"
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const identifierErrMsg string = "a valid C identifier must start with alphabetic character or '_', followed by a string of alphanumeric characters or '_'"
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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) []string {
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if !cIdentifierRegexp.MatchString(value) {
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return []string{RegexError(identifierErrMsg, cIdentifierFmt, "my_name", "MY_NAME", "MyName")}
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}
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return nil
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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) []string {
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if 1 <= port && port <= 65535 {
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return nil
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}
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return []string{InclusiveRangeError(1, 65535)}
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}
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// Now in libcontainer UID/GID limits is 0 ~ 1<<31 - 1
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// TODO: once we have a type for UID/GID we should make these that type.
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const (
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minUserID = 0
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maxUserID = math.MaxInt32
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minGroupID = 0
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maxGroupID = math.MaxInt32
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)
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// IsValidGroupId tests that the argument is a valid Unix GID.
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func IsValidGroupId(gid int64) []string {
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if minGroupID <= gid && gid <= maxGroupID {
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return nil
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}
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return []string{InclusiveRangeError(minGroupID, maxGroupID)}
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}
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// IsValidUserId tests that the argument is a valid Unix UID.
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func IsValidUserId(uid int64) []string {
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if minUserID <= uid && uid <= maxUserID {
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return nil
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}
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return []string{InclusiveRangeError(minUserID, maxUserID)}
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}
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var portNameCharsetRegex = regexp.MustCompile("^[-a-z0-9]+$")
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var portNameOneLetterRegexp = regexp.MustCompile("[a-z]")
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// IsValidPortName check that the argument is valid syntax. It must be
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// non-empty and no more than 15 characters long. It may contain only [-a-z0-9]
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// and must contain at least one letter [a-z]. It must not start or end with a
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// hyphen, nor contain adjacent hyphens.
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//
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// Note: We only allow lower-case characters, even though RFC 6335 is case
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// insensitive.
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func IsValidPortName(port string) []string {
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var errs []string
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if len(port) > 15 {
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errs = append(errs, MaxLenError(15))
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}
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if !portNameCharsetRegex.MatchString(port) {
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errs = append(errs, "must contain only alpha-numeric characters (a-z, 0-9), and hyphens (-)")
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}
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if !portNameOneLetterRegexp.MatchString(port) {
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errs = append(errs, "must contain at least one letter or number (a-z, 0-9)")
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}
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if strings.Contains(port, "--") {
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errs = append(errs, "must not contain consecutive hyphens")
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}
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if len(port) > 0 && (port[0] == '-' || port[len(port)-1] == '-') {
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errs = append(errs, "must not begin or end with a hyphen")
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}
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return errs
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}
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// IsValidIP tests that the argument is a valid IP address.
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func IsValidIP(value string) []string {
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if net.ParseIP(value) == nil {
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return []string{"must be a valid IP address, (e.g. 10.9.8.7)"}
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}
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return nil
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}
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const percentFmt string = "[0-9]+%"
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const percentErrMsg string = "a valid percent string must be a numeric string followed by an ending '%'"
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var percentRegexp = regexp.MustCompile("^" + percentFmt + "$")
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func IsValidPercent(percent string) []string {
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if !percentRegexp.MatchString(percent) {
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return []string{RegexError(percentErrMsg, percentFmt, "1%", "93%")}
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}
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return nil
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}
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const httpHeaderNameFmt string = "[-A-Za-z0-9]+"
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const httpHeaderNameErrMsg string = "a valid HTTP header must consist of alphanumeric characters or '-'"
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var httpHeaderNameRegexp = regexp.MustCompile("^" + httpHeaderNameFmt + "$")
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// IsHTTPHeaderName checks that a string conforms to the Go HTTP library's
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// definition of a valid header field name (a stricter subset than RFC7230).
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func IsHTTPHeaderName(value string) []string {
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if !httpHeaderNameRegexp.MatchString(value) {
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return []string{RegexError(httpHeaderNameErrMsg, httpHeaderNameFmt, "X-Header-Name")}
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}
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return nil
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}
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const configMapKeyFmt = `[-._a-zA-Z0-9]+`
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const configMapKeyErrMsg string = "a valid config key must consist of alphanumeric characters, '-', '_' or '.'"
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var configMapKeyRegexp = regexp.MustCompile("^" + configMapKeyFmt + "$")
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// IsConfigMapKey tests for a string that is a valid key for a ConfigMap or Secret
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func IsConfigMapKey(value string) []string {
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var errs []string
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if len(value) > DNS1123SubdomainMaxLength {
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errs = append(errs, MaxLenError(DNS1123SubdomainMaxLength))
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}
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if !configMapKeyRegexp.MatchString(value) {
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errs = append(errs, RegexError(configMapKeyErrMsg, configMapKeyFmt, "key.name", "KEY_NAME", "key-name"))
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}
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if value == "." {
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errs = append(errs, `must not be '.'`)
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} else if value == ".." {
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errs = append(errs, `must not be '..'`)
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} else if strings.HasPrefix(value, "..") {
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errs = append(errs, `must not start with '..'`)
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}
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return errs
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}
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// MaxLenError returns a string explanation of a "string too long" validation
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// failure.
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func MaxLenError(length int) string {
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return fmt.Sprintf("must be no more than %d characters", length)
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}
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// RegexError returns a string explanation of a regex validation failure.
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func RegexError(msg string, fmt string, examples ...string) string {
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if len(examples) == 0 {
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return msg + " (regex used for validation is '" + fmt + "')"
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}
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msg += " (e.g. "
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for i := range examples {
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if i > 0 {
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msg += " or "
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}
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msg += "'" + examples[i] + "', "
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}
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msg += "regex used for validation is '" + fmt + "')"
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return msg
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}
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// EmptyError returns a string explanation of a "must not be empty" validation
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// failure.
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func EmptyError() string {
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return "must be non-empty"
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}
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func prefixEach(msgs []string, prefix string) []string {
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for i := range msgs {
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msgs[i] = prefix + msgs[i]
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}
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return msgs
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}
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// InclusiveRangeError returns a string explanation of a numeric "must be
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// between" validation failure.
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func InclusiveRangeError(lo, hi int) string {
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return fmt.Sprintf(`must be between %d and %d, inclusive`, lo, hi)
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}
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