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type.go
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type.go
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// Copyright (c) 2018 Ashley Jeffs
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package session
import (
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
"github.com/aws/aws-sdk-go/aws/session"
)
//------------------------------------------------------------------------------
// CredentialsConfig contains configuration params for AWS credentials.
type CredentialsConfig struct {
ID string `json:"id" yaml:"id"`
Secret string `json:"secret" yaml:"secret"`
Token string `json:"token" yaml:"token"`
Role string `json:"role" yaml:"role"`
ExternalID string `json:"role_external_id" yaml:"role_external_id"`
}
// Config contains configuration fields for an AWS session. This config is
// common across any AWS components.
type Config struct {
Credentials CredentialsConfig `json:"credentials" yaml:"credentials"`
Endpoint string `json:"endpoint" yaml:"endpoint"`
Region string `json:"region" yaml:"region"`
}
// NewConfig returns a Config with default values.
func NewConfig() Config {
return Config{
Credentials: CredentialsConfig{
ID: "",
Secret: "",
Token: "",
Role: "",
ExternalID: "",
},
Endpoint: "",
Region: "eu-west-1",
}
}
//------------------------------------------------------------------------------
// GetSession attempts to create an AWS session based on Config.
func (c Config) GetSession(opts ...func(*aws.Config)) (*session.Session, error) {
awsConf := aws.NewConfig()
if len(c.Region) > 0 {
awsConf = awsConf.WithRegion(c.Region)
}
if len(c.Endpoint) > 0 {
awsConf = awsConf.WithEndpoint(c.Endpoint)
}
if len(c.Credentials.ID) > 0 {
awsConf = awsConf.WithCredentials(credentials.NewStaticCredentials(
c.Credentials.ID,
c.Credentials.Secret,
c.Credentials.Token,
))
}
for _, opt := range opts {
opt(awsConf)
}
sess, err := session.NewSession(awsConf)
if err != nil {
return nil, err
}
if len(c.Credentials.Role) > 0 {
var opts []func(*stscreds.AssumeRoleProvider)
if len(c.Credentials.ExternalID) > 0 {
opts = []func(*stscreds.AssumeRoleProvider){
func(p *stscreds.AssumeRoleProvider) {
p.ExternalID = &c.Credentials.ExternalID
},
}
}
sess.Config = sess.Config.WithCredentials(
stscreds.NewCredentials(sess, c.Credentials.Role, opts...),
)
}
return sess, nil
}
//------------------------------------------------------------------------------