terraform/remote/atlas.go

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package remote
import (
"bytes"
"crypto/md5"
"encoding/base64"
"fmt"
"io"
"net/http"
"net/url"
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"os"
"path"
"strings"
)
const (
// defaultAtlasServer is used when no address is given
defaultAtlasServer = "https://atlas.hashicorp.com/"
)
// AtlasRemoteClient implements the RemoteClient interface
// for an Atlas compatible server.
type AtlasRemoteClient struct {
server string
serverURL *url.URL
user string
name string
accessToken string
}
func NewAtlasRemoteClient(conf map[string]string) (*AtlasRemoteClient, error) {
client := &AtlasRemoteClient{}
if err := client.validateConfig(conf); err != nil {
return nil, err
}
return client, nil
}
func (c *AtlasRemoteClient) validateConfig(conf map[string]string) error {
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server, ok := conf["address"]
if !ok || server == "" {
server = defaultAtlasServer
}
url, err := url.Parse(server)
if err != nil {
return err
}
c.server = server
c.serverURL = url
token, ok := conf["access_token"]
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if token == "" {
token = os.Getenv("ATLAS_TOKEN")
ok = true
}
if !ok || token == "" {
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return fmt.Errorf(
"missing 'access_token' configuration or ATLAS_TOKEN environmental variable")
}
c.accessToken = token
name, ok := conf["name"]
if !ok || name == "" {
return fmt.Errorf("missing 'name' configuration")
}
parts := strings.Split(name, "/")
if len(parts) != 2 {
return fmt.Errorf("malformed name '%s'", name)
}
c.user = parts[0]
c.name = parts[1]
return nil
}
func (c *AtlasRemoteClient) GetState() (*RemoteStatePayload, error) {
// Make the HTTP request
req, err := http.NewRequest("GET", c.url().String(), nil)
if err != nil {
return nil, fmt.Errorf("Failed to make HTTP request: %v", err)
}
// Request the url
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
// Handle the common status codes
switch resp.StatusCode {
case http.StatusOK:
// Handled after
case http.StatusNoContent:
return nil, nil
case http.StatusNotFound:
return nil, nil
case http.StatusUnauthorized:
return nil, ErrRequireAuth
case http.StatusForbidden:
return nil, ErrInvalidAuth
case http.StatusInternalServerError:
return nil, ErrRemoteInternal
default:
return nil, fmt.Errorf("Unexpected HTTP response code %d", resp.StatusCode)
}
// Read in the body
buf := bytes.NewBuffer(nil)
if _, err := io.Copy(buf, resp.Body); err != nil {
return nil, fmt.Errorf("Failed to read remote state: %v", err)
}
// Create the payload
payload := &RemoteStatePayload{
State: buf.Bytes(),
}
// Check for the MD5
if raw := resp.Header.Get("Content-MD5"); raw != "" {
md5, err := base64.StdEncoding.DecodeString(raw)
if err != nil {
return nil, fmt.Errorf("Failed to decode Content-MD5 '%s': %v", raw, err)
}
payload.MD5 = md5
} else {
// Generate the MD5
hash := md5.Sum(payload.State)
payload.MD5 = hash[:md5.Size]
}
return payload, nil
}
func (c *AtlasRemoteClient) PutState(state []byte, force bool) error {
// Get the target URL
base := c.url()
// Generate the MD5
hash := md5.Sum(state)
b64 := base64.StdEncoding.EncodeToString(hash[:md5.Size])
// Set the force query parameter if needed
if force {
values := base.Query()
values.Set("force", "true")
base.RawQuery = values.Encode()
}
// Make the HTTP client and request
req, err := http.NewRequest("PUT", base.String(), bytes.NewReader(state))
if err != nil {
return fmt.Errorf("Failed to make HTTP request: %v", err)
}
// Prepare the request
req.Header.Set("Content-MD5", b64)
req.Header.Set("Content-Type", "application/json")
req.ContentLength = int64(len(state))
// Make the request
resp, err := http.DefaultClient.Do(req)
if err != nil {
return fmt.Errorf("Failed to upload state: %v", err)
}
defer resp.Body.Close()
// Handle the error codes
switch resp.StatusCode {
case http.StatusOK:
return nil
case http.StatusConflict:
return ErrConflict
case http.StatusPreconditionFailed:
return ErrServerNewer
case http.StatusUnauthorized:
return ErrRequireAuth
case http.StatusForbidden:
return ErrInvalidAuth
case http.StatusInternalServerError:
return ErrRemoteInternal
default:
return fmt.Errorf("Unexpected HTTP response code %d", resp.StatusCode)
}
}
func (c *AtlasRemoteClient) DeleteState() error {
// Make the HTTP request
req, err := http.NewRequest("DELETE", c.url().String(), nil)
if err != nil {
return fmt.Errorf("Failed to make HTTP request: %v", err)
}
// Make the request
resp, err := http.DefaultClient.Do(req)
if err != nil {
return fmt.Errorf("Failed to delete state: %v", err)
}
defer resp.Body.Close()
// Handle the error codes
switch resp.StatusCode {
case http.StatusOK:
return nil
case http.StatusNoContent:
return nil
case http.StatusNotFound:
return nil
case http.StatusUnauthorized:
return ErrRequireAuth
case http.StatusForbidden:
return ErrInvalidAuth
case http.StatusInternalServerError:
return ErrRemoteInternal
}
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return fmt.Errorf("Unexpected HTTP response code %d", resp.StatusCode)
}
func (c *AtlasRemoteClient) url() *url.URL {
return &url.URL{
Scheme: c.serverURL.Scheme,
Host: c.serverURL.Host,
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Path: path.Join("api/v1/terraform/state", c.user, c.name),
RawQuery: fmt.Sprintf("access_token=%s", c.accessToken),
}
}