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servicename.go
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servicename.go
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// Copyright (c) 2021 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package internal
import (
"errors"
"fmt"
"regexp"
"go.uber.org/multierr"
)
// We disallow UUIDs explicitly, though they're otherwise valid patterns.
var _uuidRegexp = regexp.MustCompile("[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}")
// ValidateServiceName returns an error if the given servive name is invalid.
// Valid names are at least two characters long, start with [a-z], contain only
// [0-9a-z] and non-consecutive hyphens, and end in [0-9a-z]. Furthermore,
// names may not contain UUIDs.
func ValidateServiceName(name string) error {
if len(name) < 2 {
// Short names aren't safe to check any further.
return errors.New("service name must be at least two characters long")
}
return multierr.Combine(
checkHyphens(name),
checkFirstCharacter(name),
checkForbiddenCharacters(name),
checkUUIDs(name),
)
}
func checkHyphens(name string) error {
for i := 1; i < len(name); i++ {
if name[i-1] == '-' && name[i] == '-' {
return fmt.Errorf("service name %q contains consecutive hyphens", name)
}
}
if name[len(name)-1] == '-' {
return fmt.Errorf("service name %q ends with a hyphen", name)
}
return nil
}
func checkFirstCharacter(name string) error {
if name[0] < 'a' || name[0] > 'z' {
return fmt.Errorf("service name %q doesn't start with a lowercase ASCII letter", name)
}
return nil
}
func checkForbiddenCharacters(name string) error {
for _, c := range name {
switch {
case 'a' <= c && c <= 'z':
continue
case '0' <= c && c <= '9':
continue
case c == '-':
continue
case c == '_':
continue
default:
return fmt.Errorf("service name %q contains characters other than [0-9a-z] and hyphens", name)
}
}
return nil
}
func checkUUIDs(name string) error {
if _uuidRegexp.MatchString(name) {
return fmt.Errorf("service name %q contains a UUID", name)
}
return nil
}