/
factory.go
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/
factory.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package vaultconfigsource
import (
"context"
"errors"
"fmt"
"net/url"
"time"
"go.opentelemetry.io/collector/component"
"go.uber.org/zap"
"github.com/signalfx/splunk-otel-collector/internal/configsource"
)
const (
// The "type" of Vault config sources in configuration.
typeStr = "vault"
defaultPollInterval = 1 * time.Minute
)
// Private error types to help with testability.
type (
errEmptyAuth struct{ error }
errEmptyToken struct{ error }
errInvalidEndpoint struct{ error }
errMissingAuthentication struct{ error }
errMissingEndpoint struct{ error }
errMissingPath struct{ error }
errMultipleAuthMethods struct{ error }
errNonPositivePollInterval struct{ error }
)
type vaultFactory struct{}
func (v *vaultFactory) Type() component.Type {
return component.MustNewType(typeStr)
}
func (v *vaultFactory) CreateDefaultConfig() configsource.Settings {
return &Config{
SourceSettings: configsource.NewSourceSettings(component.MustNewID(typeStr)),
PollInterval: defaultPollInterval,
}
}
func (v *vaultFactory) CreateConfigSource(_ context.Context, settings configsource.Settings, logger *zap.Logger) (configsource.ConfigSource, error) {
vaultCfg := settings.(*Config)
if vaultCfg.Endpoint == "" {
return nil, &errMissingEndpoint{errors.New("cannot connect to vault with an empty endpoint")}
}
if _, err := url.ParseRequestURI(vaultCfg.Endpoint); err != nil {
return nil, &errInvalidEndpoint{fmt.Errorf("invalid endpoint %q: %w", vaultCfg.Endpoint, err)}
}
if vaultCfg.Path == "" {
return nil, &errMissingPath{errors.New("cannot connect to vault with an empty path")}
}
if err := validateAuth(vaultCfg.Authentication); err != nil {
return nil, err
}
if vaultCfg.PollInterval <= 0 {
return nil, &errNonPositivePollInterval{errors.New("poll_interval must to be positive")}
}
return newConfigSource(vaultCfg, logger)
}
// NewFactory creates a factory for Vault ConfigSource objects.
func NewFactory() configsource.Factory {
return &vaultFactory{}
}
func validateAuth(auth *Authentication) error {
if auth == nil {
return &errMissingAuthentication{errors.New("cannot connect to vault without an explicit auth method")}
}
countMethods := 0
if auth.Token != nil {
countMethods++
if *auth.Token == "" {
return &errEmptyToken{errors.New("token cannot be empty")}
}
}
if auth.IAMAuthentication != nil {
countMethods++
}
if auth.GCPAuthentication != nil {
countMethods++
}
if countMethods == 0 {
return &errEmptyAuth{errors.New("auth cannot be empty, exactly one method must be used")}
}
if countMethods > 1 {
return &errMultipleAuthMethods{errors.New("multiple auth methods were set, use only one")}
}
return nil
}