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build/version: check AppPreRelease semantics in init()

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We'll do the validation during construction of the runtime so that we
can safely use the AppPreRelease field externally without needing to
normalize it.
This commit is contained in:
Conner Fromknecht 2020-04-09 17:04:11 -07:00
parent 640aadb61a
commit b68764f86c
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GPG Key ID: E7D737B67FA592C7
1 changed files with 18 additions and 22 deletions
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40
build/version.go
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@ -6,7 +6,6 @@
package build
import (
"bytes"
"fmt"
"strings"
)
@ -36,19 +35,30 @@ const (
AppPreRelease = "beta"
)
func init() {
// Assert that AppPreRelease is valid according to the semantic
// versioning guidelines for pre-release version and build metadata
// strings. In particular it MUST only contain characters in
// semanticAlphabet.
for _, r := range AppPreRelease {
if !strings.ContainsRune(semanticAlphabet, r) {
panic(fmt.Errorf("rune: %v is not in the semantic "+
"alphabet", r))
}
}
}
// Version returns the application version as a properly formed string per the
// semantic versioning 2.0.0 spec (http://semver.org/).
func Version() string {
// Start with the major, minor, and patch versions.
version := fmt.Sprintf("%d.%d.%d", AppMajor, AppMinor, AppPatch)
// Append pre-release version if there is one. The hyphen called for
// by the semantic versioning spec is automatically appended and should
// not be contained in the pre-release string. The pre-release version
// is not appended if it contains invalid characters.
preRelease := normalizeVerString(AppPreRelease)
if preRelease != "" {
version = fmt.Sprintf("%s-%s", version, preRelease)
// Append pre-release version if there is one. The hyphen called for by
// the semantic versioning spec is automatically appended and should not
// be contained in the pre-release string.
if AppPreRelease != "" {
version = fmt.Sprintf("%s-%s", version, AppPreRelease)
}
// Append commit hash of current build to version.
@ -56,17 +66,3 @@ func Version() string {
return version
}
// normalizeVerString returns the passed string stripped of all characters which
// are not valid according to the semantic versioning guidelines for pre-release
// version and build metadata strings. In particular they MUST only contain
// characters in semanticAlphabet.
func normalizeVerString(str string) string {
var result bytes.Buffer
for _, r := range str {
if strings.ContainsRune(semanticAlphabet, r) {
result.WriteRune(r)
}
}
return result.String()
}