xfy
6967957299
Enable environment variable substitution in configuration files using
${VAR} syntax. Supports 12-factor app deployment patterns without
hardcoding secrets or environment-specific values.
Syntax:
- Only ${VAR} with curly braces (avoids conflict with $variable system)
- Missing variables preserved as-is (${MISSING} stays unchanged)
- Multiple variables per line supported
- Adjacent variables ${A}${B} handled correctly
Integration:
- Applied in config.Load() after os.ReadFile, before yaml.Unmarshal
- Applied in processIncludes() for each included file
- 12 unit tests covering single/multiple/missing/empty variables
23 lines
447 B
Go
23 lines
447 B
Go
package config
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import (
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"os"
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"regexp"
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)
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var envPattern = regexp.MustCompile(`\$\{([^}]+)\}`)
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// ExpandEnv replaces ${VAR} patterns with environment variable values.
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func ExpandEnv(data []byte) []byte {
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return envPattern.ReplaceAllFunc(data, func(match []byte) []byte {
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name := string(match[2 : len(match)-1])
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if name == "" {
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return match
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}
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if value, ok := os.LookupEnv(name); ok {
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return []byte(value)
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}
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return match
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})
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}
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