mirror of https://github.com/gofiber/fiber.git
69 lines
1.5 KiB
Go
69 lines
1.5 KiB
Go
package envvar
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import (
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"os"
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"strings"
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"github.com/gofiber/fiber/v2"
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)
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// Config defines the config for middleware.
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type Config struct {
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// ExportVars specifies the environment variables that should export
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ExportVars map[string]string
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// ExcludeVars specifies the environment variables that should not export
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ExcludeVars map[string]string
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}
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type EnvVar struct {
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Vars map[string]string `json:"vars"`
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}
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func (envVar *EnvVar) set(key, val string) {
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envVar.Vars[key] = val
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}
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func New(config ...Config) fiber.Handler {
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var cfg Config
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if len(config) > 0 {
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cfg = config[0]
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}
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return func(c *fiber.Ctx) error {
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if c.Method() != fiber.MethodGet {
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return fiber.ErrMethodNotAllowed
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}
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envVar := newEnvVar(cfg)
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varsByte, err := c.App().Config().JSONEncoder(envVar)
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if err != nil {
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return c.Status(fiber.StatusInternalServerError).SendString(err.Error())
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}
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c.Set(fiber.HeaderContentType, fiber.MIMEApplicationJSONCharsetUTF8)
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return c.Send(varsByte)
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}
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}
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func newEnvVar(cfg Config) *EnvVar {
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vars := &EnvVar{Vars: make(map[string]string)}
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if len(cfg.ExportVars) > 0 {
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for key, defaultVal := range cfg.ExportVars {
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vars.set(key, defaultVal)
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if envVal, exists := os.LookupEnv(key); exists {
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vars.set(key, envVal)
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}
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}
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} else {
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const numElems = 2
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for _, envVal := range os.Environ() {
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keyVal := strings.SplitN(envVal, "=", numElems)
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if _, exists := cfg.ExcludeVars[keyVal[0]]; !exists {
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vars.set(keyVal[0], keyVal[1])
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}
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}
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}
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return vars
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}
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