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funcs.go
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funcs.go
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package scaffold
import (
"encoding/json"
"fmt"
"regexp"
"strings"
)
// BicepName returns a name suitable for use as a bicep variable name.
//
// The name is converted to camel case, with treatment for underscore or dash separators,
// and all non-alphanumeric characters are removed.
func BicepName(name string) string {
sb := strings.Builder{}
separatorStart := -1
for i := range name {
switch name[i] {
case '-', '_':
if separatorStart == -1 { // track first occurrence of consecutive separators
separatorStart = i
}
default:
if !isAsciiAlphaNumeric(name[i]) {
continue
}
char := name[i]
if separatorStart != -1 {
if separatorStart == 0 { // first character should be lowerCase
char = lowerCase(name[i])
} else {
char = upperCase(name[i])
}
separatorStart = -1
}
if i == 0 {
char = lowerCase(name[i])
}
sb.WriteByte(char)
}
}
return sb.String()
}
// UpperSnakeAlpha returns a name in upper-snake case alphanumeric name separated only by underscores.
//
// Non-alphanumeric characters are discarded, while consecutive separators ('-', '_', and '.') are treated
// as a single underscore separator.
func AlphaSnakeUpper(name string) string {
sb := strings.Builder{}
separatorStart := -1
for i := range name {
switch name[i] {
case '-', '_', '.':
if separatorStart == -1 { // track first occurrence of consecutive separators
separatorStart = i
}
default:
if !isAsciiAlphaNumeric(name[i]) {
continue
}
if separatorStart != -1 {
if separatorStart != 0 { // don't write prefix separator
sb.WriteByte('_')
}
separatorStart = -1
}
sb.WriteByte(upperCase(name[i]))
}
}
return sb.String()
}
func isAsciiAlphaNumeric(c byte) bool {
return ('0' <= c && c <= '9') || ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z')
}
func upperCase(r byte) byte {
if 'a' <= r && r <= 'z' {
r -= 'a' - 'A'
}
return r
}
func lowerCase(r byte) byte {
if 'A' <= r && r <= 'Z' {
r += 'a' - 'A'
}
return r
}
// Provide a reasonable limit for the container app infix to avoid name length issues
// This is calculated as follows:
// 1. Start with max initial length of 32 characters from the Container App name
// https://learn.microsoft.com/azure/azure-resource-manager/management/resource-name-rules#microsoftapp
// 2. Prefix abbreviation of 'ca-' from abbreviations.json (4 characters)
// 3. Bicep resource token (13 characters) + separator '-' (1 character) -- total of 14 characters
//
// Which leaves us with: 32 - 4 - 14 = 14 characters.
const containerAppNameInfixMaxLen = 12
// We allow 2 additional characters for wiggle-room. We've seen failures when container app name is exactly at 32.
const containerAppNameMaxLen = 30
func containerAppName(name string, maxLen int) string {
if len(name) > maxLen {
name = name[:maxLen]
}
// trim to allowed characters:
// - only alphanumeric and '-'
// - no repeated '-'
// - no '-' as the first or last character
sb := strings.Builder{}
i := 0
for i < len(name) {
if isAsciiAlphaNumeric(name[i]) {
sb.WriteByte(lowerCase(name[i]))
} else if name[i] == '-' || name[i] == '_' {
j := i + 1
for j < len(name) && (name[j] == '-' || name[i] == '_') { // find consecutive matches
j++
}
if i != 0 && j != len(name) { // only write '-' if not first or last character
sb.WriteByte('-')
}
i = j
continue
}
i++
}
return sb.String()
}
// ContainerAppName returns a suitable name a container app resource.
//
// The name is treated to only contain alphanumeric and dash characters, with no repeated dashes, and no dashes
// as the first or last character.
func ContainerAppName(name string) string {
return containerAppName(name, containerAppNameMaxLen)
}
// ContainerAppSecretName returns a suitable name a container app secret name.
//
// The name is treated to only contain lowercase alphanumeric and dash characters, and must start and end with an
// alphanumeric character
func ContainerAppSecretName(name string) string {
return strings.ReplaceAll(strings.ToLower(name), "_", "-")
}
// camelCaseRegex is a regular expression used to match camel case patterns.
// It matches a lowercase letter or digit followed by an uppercase letter.
var camelCaseRegex = regexp.MustCompile(`([a-z0-9])([A-Z])`)
// EnvFormat takes an input parameter like `fooParam` which is expected to be in camel case and returns it in
// upper snake case with env var template, like `${AZURE_FOO_PARAM}`.
func EnvFormat(src string) string {
snake := strings.ReplaceAll(strings.ToUpper(camelCaseRegex.ReplaceAllString(src, "${1}_${2}")), "-", "_")
return fmt.Sprintf("${AZURE_%s}", snake)
}
// ContainerAppInfix returns a suitable infix for a container app resource.
//
// The name is treated to only contain alphanumeric and dash characters, with no repeated dashes, and no dashes
// as the first or last character.
func ContainerAppInfix(name string) string {
return containerAppName(name, containerAppNameInfixMaxLen)
}
// Formats a parameter value for use in a bicep file.
// If the value is a string, it is quoted inline with no indentation.
// Otherwise, the value is marshaled with indentation specified by prefix and indent.
func FormatParameter(prefix string, indent string, value any) (string, error) {
if valueStr, ok := value.(string); ok {
return fmt.Sprintf("\"%s\"", valueStr), nil
}
val, err := json.MarshalIndent(value, prefix, indent)
if err != nil {
return "", err
}
return string(val), nil
}