What causes "auth: configuration: %w" in kataras/iris?

Inspect the wrapped %w error from Keys.Load() for the root cause

auth: configuration: %w

Error message

auth: configuration: %w

What it means

Configuration.validate() wraps any error returned by c.Keys.Load() with the 'auth: configuration:' prefix. The configured keys source (static map, file, or remote provider) failed to load, so the auth instance cannot be built.

Source

Thrown at auth/configuration.go:79

		// 16, 24, or 32 bytes to select AES-128, AES-192, or AES-256.
		Block string `json:"block" yaml:"Block" toml:"Block" ini:"block"`
	}
)

func (c *Configuration) validate() (jwt.Keys, error) {
	if len(c.Headers) == 0 {
		return nil, fmt.Errorf("auth: configuration: headers slice is empty")
	}

	if c.Cookie.Name != "" {
		if c.Cookie.Hash == "" || c.Cookie.Block == "" {
			return nil, fmt.Errorf("auth: configuration: cookie block and cookie hash are required for security reasons when cookie is used")
		}
	}

	keys, err := c.Keys.Load()
	if err != nil {
		return nil, fmt.Errorf("auth: configuration: %w", err)
	}

	if _, ok := keys[KIDAccess]; !ok {
		return nil, fmt.Errorf("auth: configuration: %s access token is missing from the configuration", KIDAccess)
	}

	// Let's keep refresh optional.
	// if _, ok := keys[KIDRefresh]; !ok {
	// 	return nil, fmt.Errorf("auth: configuration: %s refresh token is missing from the configuration", KIDRefresh)
	// }
	return keys, nil
}

// BindRandom binds the "c" configuration to random values for keys and cookie security.
// Keys will not be persisted between restarts,
// a more persistent storage should be considered for production applications,
// see BindFile method and LoadConfiguration/MustLoadConfiguration package-level functions.
func (c *Configuration) BindRandom() error {

View on GitHub (pinned to 7bedaf55a0)

Solutions

Inspect the wrapped %w error from Keys.Load() for the root cause
Verify the keys file/path/env vars exist and are readable by the process
Validate key encoding (PEM/base64) matches what the Keys provider expects
In containers, confirm the secrets volume is mounted before app start

Example fix

// before
Keys: auth.KeysConfiguration{ File: "/etc/secrets/keys.yaml" } // file not mounted
// after
if _, err := os.Stat("/etc/secrets/keys.yaml"); err != nil { log.Fatal("keys file missing: ", err) }
Keys: auth.KeysConfiguration{ File: "/etc/secrets/keys.yaml" }

Defensive patterns

Strategy: validation

Validate before calling

if _, err := os.Stat(keysFilePath); err != nil {
    return fmt.Errorf("keys source unavailable before auth.New: %w", err)
}

Try / catch

_, err := auth.New(cfg)
if err != nil {
    var pathErr *fs.PathError
    if errors.As(err, &pathErr) { log.Fatalf("keys file unreadable: %v", pathErr) }
    log.Fatalf("auth configuration invalid: %v", err)
}

Prevention

Check that secrets files/env vars exist before calling auth.New at startup
Mount secrets volumes in containers before the app process starts
Validate key file encoding in CI with a dry-run load
Log only the wrapped root cause, never key contents

When it happens

Trigger: auth.New → Configuration.validate → Keys.Load() returns an error: missing key file, unreadable path, invalid key encoding, or a remote key provider network failure.

Common situations: Wrong path to a keys file in deployment; secrets volume not mounted in a container; a key file with invalid base64/PEM; environment variable backing the keys source unset in the new environment.

Related errors

AI-assisted analysis of kataras/iris@7bedaf55a0 (2026-08-30). Data as JSON: /api/errors/2dfe4f1ea3a8d8fa. Report an issue: GitHub.