goext/bfcodegen/csid-generate.template

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// Code generated by csid-generate.go DO NOT EDIT.
package {{.PkgName}}
import "crypto/rand"
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import "crypto/sha256"
import "fmt"
import "github.com/go-playground/validator/v10"
import "github.com/rs/zerolog/log"
import "gogs.mikescher.com/BlackForestBytes/goext/exerr"
import "gogs.mikescher.com/BlackForestBytes/goext/langext"
import "gogs.mikescher.com/BlackForestBytes/goext/rext"
import "math/big"
import "reflect"
import "regexp"
import "strings"
const ChecksumCharsetIDGenerator = "{{.Checksum}}" // GoExtVersion: {{.GoextVersion}}
const idlen = 24
const checklen = 1
const idCharset = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
const idCharsetLen = len(idCharset)
var charSetReverseMap = generateCharsetMap()
const ({{range .IDs}}
prefix{{.Name}} = "{{.Prefix}}" {{end}}
)
var ({{range .IDs}}
regex{{.Name}} = generateRegex(prefix{{.Name}}) {{end}}
)
func generateRegex(prefix string) rext.Regex {
return rext.W(regexp.MustCompile(fmt.Sprintf("^%s[%s]{%d}[%s]{%d}$", prefix, idCharset, idlen-len(prefix)-checklen, idCharset, checklen)))
}
func generateCharsetMap() []int {
result := make([]int, 128)
for i := 0; i < len(result); i++ {
result[i] = -1
}
for idx, chr := range idCharset {
result[int(chr)] = idx
}
return result
}
func generateID(prefix string) string {
k := ""
csMax := big.NewInt(int64(idCharsetLen))
checksum := 0
for i := 0; i < idlen-len(prefix)-checklen; i++ {
v, err := rand.Int(rand.Reader, csMax)
if err != nil {
panic(err)
}
v64 := v.Int64()
k += string(idCharset[v64])
checksum = (checksum + int(v64)) % (idCharsetLen)
}
checkstr := string(idCharset[checksum%idCharsetLen])
return prefix + k + checkstr
}
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func generateIDFromSeed(prefix string, seed string) string {
h := sha256.New()
iddata := ""
for len(iddata) < idlen-len(prefix)-checklen {
h.Write([]byte(seed))
bs := h.Sum(nil)
iddata += langext.NewAnyBaseConverter(idCharset).Encode(bs)
}
checksum := 0
for i := 0; i < idlen-len(prefix)-checklen; i++ {
ichr := int(iddata[i])
checksum = (checksum + charSetReverseMap[ichr]) % (idCharsetLen)
}
checkstr := string(idCharset[checksum%idCharsetLen])
return prefix + iddata[:(idlen-len(prefix)-checklen)] + checkstr
}
func validateID(prefix string, value string) error {
if len(value) != idlen {
return exerr.New(exerr.TypeInvalidCSID, "id has the wrong length").Str("value", value).Build()
}
if !strings.HasPrefix(value, prefix) {
return exerr.New(exerr.TypeInvalidCSID, "id is missing the correct prefix").Str("value", value).Str("prefix", prefix).Build()
}
checksum := 0
for i := len(prefix); i < len(value)-checklen; i++ {
ichr := int(value[i])
if ichr < 0 || ichr >= len(charSetReverseMap) || charSetReverseMap[ichr] == -1 {
return exerr.New(exerr.TypeInvalidCSID, "id contains invalid characters").Str("value", value).Build()
}
checksum = (checksum + charSetReverseMap[ichr]) % (idCharsetLen)
}
checkstr := string(idCharset[checksum%idCharsetLen])
if !strings.HasSuffix(value, checkstr) {
return exerr.New(exerr.TypeInvalidCSID, "id checkstring is invalid").Str("value", value).Str("checkstr", checkstr).Build()
}
return nil
}
func getRawData(prefix string, value string) string {
if len(value) != idlen {
return ""
}
return value[len(prefix) : idlen-checklen]
}
func getCheckString(prefix string, value string) string {
if len(value) != idlen {
return ""
}
return value[idlen-checklen:]
}
func ValidateEntityID(vfl validator.FieldLevel) bool {
if !vfl.Field().CanInterface() {
log.Error().Msgf("Failed to validate EntityID (cannot interface ?!?)")
return false
}
ifvalue := vfl.Field().Interface()
if value1, ok := ifvalue.(EntityID); ok {
if vfl.Field().Type().Kind() == reflect.Pointer && langext.IsNil(value1) {
return true
}
if err := value1.Valid(); err != nil {
log.Debug().Msgf("Failed to validate EntityID '%s' (%s)", value1.String(), err.Error())
return false
} else {
return true
}
} else {
log.Error().Msgf("Failed to validate EntityID (wrong type: %T)", ifvalue)
return false
}
}
{{range .IDs}}
// ================================ {{.Name}} ({{.FileRelative}}) ================================
func New{{.Name}}() {{.Name}} {
return {{.Name}}(generateID(prefix{{.Name}}))
}
func (id {{.Name}}) Valid() error {
return validateID(prefix{{.Name}}, string(id))
}
func (i {{.Name}}) String() string {
return string(i)
}
func (i {{.Name}}) Prefix() string {
return prefix{{.Name}}
}
func (id {{.Name}}) Raw() string {
return getRawData(prefix{{.Name}}, string(id))
}
func (id {{.Name}}) CheckString() string {
return getCheckString(prefix{{.Name}}, string(id))
}
func (id {{.Name}}) Regex() rext.Regex {
return regex{{.Name}}
}
{{end}}