terraform/state/remote/azure.go

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package remote
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"github.com/Azure/azure-sdk-for-go/arm/storage"
mainStorage "github.com/Azure/azure-sdk-for-go/storage"
"github.com/Azure/go-autorest/autorest/azure"
riviera "github.com/jen20/riviera/azure"
)
func azureFactory(conf map[string]string) (Client, error) {
storageAccountName, ok := conf["storage_account_name"]
if !ok {
return nil, fmt.Errorf("missing 'storage_account_name' configuration")
}
containerName, ok := conf["container_name"]
if !ok {
return nil, fmt.Errorf("missing 'container_name' configuration")
}
keyName, ok := conf["key"]
if !ok {
return nil, fmt.Errorf("missing 'key' configuration")
}
accessKey, ok := confOrEnv(conf, "access_key", "ARM_ACCESS_KEY")
if !ok {
resourceGroupName, ok := conf["resource_group_name"]
if !ok {
return nil, fmt.Errorf("missing 'resource_group' configuration")
}
var err error
accessKey, err = getStorageAccountAccessKey(conf, resourceGroupName, storageAccountName)
if err != nil {
return nil, fmt.Errorf("Couldn't read access key from storage account: %s.", err)
}
}
storageClient, err := mainStorage.NewBasicClient(storageAccountName, accessKey)
if err != nil {
return nil, fmt.Errorf("Error creating storage client for storage account %q: %s", storageAccountName, err)
}
blobClient := storageClient.GetBlobService()
return &AzureClient{
blobClient: &blobClient,
containerName: containerName,
keyName: keyName,
}, nil
}
func getStorageAccountAccessKey(conf map[string]string, resourceGroupName, storageAccountName string) (string, error) {
creds, err := getCredentialsFromConf(conf)
if err != nil {
return "", err
}
oauthConfig, err := azure.PublicCloud.OAuthConfigForTenant(creds.TenantID)
if err != nil {
return "", err
}
if oauthConfig == nil {
return "", fmt.Errorf("Unable to configure OAuthConfig for tenant %s", creds.TenantID)
}
spt, err := azure.NewServicePrincipalToken(*oauthConfig, creds.ClientID, creds.ClientSecret, azure.PublicCloud.ResourceManagerEndpoint)
if err != nil {
return "", err
}
accountsClient := storage.NewAccountsClient(creds.SubscriptionID)
accountsClient.Authorizer = spt
keys, err := accountsClient.ListKeys(resourceGroupName, storageAccountName)
if err != nil {
return "", fmt.Errorf("Error retrieving keys for storage account %q: %s", storageAccountName, err)
}
if keys.Key1 == nil {
return "", fmt.Errorf("Nil key returned for storage account %q", storageAccountName)
}
return *keys.Key1, nil
}
func getCredentialsFromConf(conf map[string]string) (*riviera.AzureResourceManagerCredentials, error) {
subscriptionID, ok := confOrEnv(conf, "arm_subscription_id", "ARM_SUBSCRIPTION_ID")
if !ok {
return nil, fmt.Errorf("missing 'arm_subscription_id' configuration")
}
clientID, ok := confOrEnv(conf, "arm_client_id", "ARM_CLIENT_ID")
if !ok {
return nil, fmt.Errorf("missing 'arm_client_id' configuration")
}
clientSecret, ok := confOrEnv(conf, "arm_client_secret", "ARM_CLIENT_SECRET")
if !ok {
return nil, fmt.Errorf("missing 'arm_client_secret' configuration")
}
tenantID, ok := confOrEnv(conf, "arm_tenant_id", "ARM_TENANT_ID")
if !ok {
return nil, fmt.Errorf("missing 'arm_tenant_id' configuration")
}
return &riviera.AzureResourceManagerCredentials{
SubscriptionID: subscriptionID,
ClientID: clientID,
ClientSecret: clientSecret,
TenantID: tenantID,
}, nil
}
func confOrEnv(conf map[string]string, confKey, envVar string) (string, bool) {
value, ok := conf[confKey]
if ok {
return value, true
}
value = os.Getenv(envVar)
return value, value != ""
}
type AzureClient struct {
blobClient *mainStorage.BlobStorageClient
containerName string
keyName string
}
func (c *AzureClient) Get() (*Payload, error) {
blob, err := c.blobClient.GetBlob(c.containerName, c.keyName)
if err != nil {
if storErr, ok := err.(mainStorage.AzureStorageServiceError); ok {
if storErr.Code == "BlobNotFound" {
return nil, nil
}
}
return nil, err
}
defer blob.Close()
data, err := ioutil.ReadAll(blob)
if err != nil {
return nil, err
}
payload := &Payload{
Data: data,
}
// If there was no data, then return nil
if len(payload.Data) == 0 {
return nil, nil
}
return payload, nil
}
func (c *AzureClient) Put(data []byte) error {
return c.blobClient.CreateBlockBlobFromReader(
c.containerName,
c.keyName,
uint64(len(data)),
bytes.NewReader(data),
map[string]string{
"Content-Type": "application/json",
},
)
}
func (c *AzureClient) Delete() error {
return c.blobClient.DeleteBlob(c.containerName, c.keyName, nil)
}