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Incorporate @jen20 code comments (errors, errwrap, TODO’s)

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Implement content_md5, content_type, extension_headers support.
pull/8180/head
Matt Morrison 10 years ago
parent e6c11a53dd
commit 5833198d73
3 changed files with 176 additions and 223 deletions
Show Stats Download Patch File Download Diff File

180
builtin/providers/google/data_source_storage_object_signed_url.go
Unescape View File

@ -9,6 +9,7 @@ import (
"crypto/x509"
"encoding/base64"
"encoding/pem"
"errors"
"fmt"
"log"
"net/url"
@ -17,11 +18,15 @@ import (
"strings"
"time"
"sort"
"regexp"
"github.com/hashicorp/errwrap"
"github.com/hashicorp/terraform/helper/pathorcontents"
"github.com/hashicorp/terraform/helper/schema"
"golang.org/x/oauth2/google"
"golang.org/x/oauth2/jwt"
"sort"
)
const gcsBaseUrl = "https://storage.googleapis.com"
@ -36,6 +41,11 @@ func dataSourceGoogleSignedUrl() *schema.Resource {
Type: schema.TypeString,
Required: true,
},
"content_md5": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Default: "",
},
"content_type": &schema.Schema{
Type: schema.TypeString,
Optional: true,
@ -50,20 +60,17 @@ func dataSourceGoogleSignedUrl() *schema.Resource {
Optional: true,
Default: "1h",
},
"http_method": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Default: "GET",
},
"http_headers": &schema.Schema{
Type: schema.TypeMap,
Optional: true,
Elem: schema.TypeString,
"extension_headers": &schema.Schema{
Type: schema.TypeMap,
Optional: true,
Elem: schema.TypeString,
ValidateFunc: validateExtensionHeaders,
},
"md5_digest": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Default: "",
"http_method": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Default: "GET",
ValidateFunc: validateHttpMethod,
},
"path": &schema.Schema{
Type: schema.TypeString,
@ -77,6 +84,26 @@ func dataSourceGoogleSignedUrl() *schema.Resource {
}
}
func validateExtensionHeaders(v interface{}, k string) (ws []string, errors []error) {
hdrMap := v.(map[string]interface{})
for k, _ := range hdrMap {
if !strings.HasPrefix(strings.ToLower(k), "x-goog") {
errors = append(errors, fmt.Errorf(
"extension_header (%s) not valid, header name must begin with 'x-goog-'", k))
}
}
return
}
func validateHttpMethod(v interface{}, k string) (ws []string, errs []error) {
value := v.(string)
value = strings.ToUpper(value)
if !regexp.MustCompile(`^(GET|HEAD|PUT|DELETE)$`).MatchString(value) {
errs = append(errs, errors.New("HTTP method must be one of [GET|HEAD|PUT|DELETE]"))
}
return
}
func dataSourceGoogleSignedUrlRead(d *schema.ResourceData, meta interface{}) error {
config := meta.(*Config)
@ -87,7 +114,7 @@ func dataSourceGoogleSignedUrlRead(d *schema.ResourceData, meta interface{}) err
if method, ok := d.GetOk("http_method"); ok && len(method.(string)) >= 3 {
urlData.HttpMethod = method.(string)
} else {
return fmt.Errorf("not a valid http method")
return errors.New("not a valid http method")
}
// convert duration to an expiration datetime (unix time in seconds)
@ -97,16 +124,23 @@ func dataSourceGoogleSignedUrlRead(d *schema.ResourceData, meta interface{}) err
}
duration, err := time.ParseDuration(durationString)
if err != nil {
return fmt.Errorf("could not parse duration")
return errwrap.Wrapf("could not parse duration: {{err}}", err)
}
expires := time.Now().Unix() + int64(duration.Seconds())
urlData.Expires = int(expires)
// content_md5 is optional
if v, ok := d.GetOk("content_md5"); ok {
urlData.ContentMd5 = v.(string)
}
// content_type is optional
if v, ok := d.GetOk("content_type"); ok {
urlData.ContentType = v.(string)
}
if v, ok := d.GetOk("http_headers"); ok {
// extension_headers (x-goog-* HTTP headers) are optional
if v, ok := d.GetOk("extension_headers"); ok {
hdrMap := v.(map[string]interface{})
if len(hdrMap) > 0 {
@ -117,10 +151,6 @@ func dataSourceGoogleSignedUrlRead(d *schema.ResourceData, meta interface{}) err
}
}
if v, ok := d.GetOk("md5_digest"); ok {
urlData.Md5Digest = v.(string)
}
// object path
path := []string{
"",
@ -137,26 +167,28 @@ func dataSourceGoogleSignedUrlRead(d *schema.ResourceData, meta interface{}) err
}
urlData.JwtConfig = jwtConfig
// Sign url object data
signature, err := SignString(urlData.CreateSigningString(), jwtConfig)
// Construct URL
signedUrl, err := urlData.SignedUrl()
if err != nil {
return fmt.Errorf("could not sign data: %v", err)
return err
}
urlData.Signature = signature
// Construct URL
finalUrl := urlData.BuildUrl()
d.SetId(urlData.EncodedSignature())
d.Set("signed_url", finalUrl)
// Success
d.Set("signed_url", signedUrl)
encodedSig, err := urlData.EncodedSignature()
if err != nil {
return err
}
d.SetId(encodedSig)
return nil
}
// This looks for credentials json in the following places,
// loadJwtConfig looks for credentials json in the following places,
// in order of preference:
//
// 1. Credentials provided in data source `credentials` attribute.
// 2. Credentials provided in the provider definition.
// 1. `credentials` attribute of the datasource
// 2. `credentials` attribute in the provider definition.
// 3. A JSON file whose path is specified by the
// GOOGLE_APPLICATION_CREDENTIALS environment variable.
func loadJwtConfig(d *schema.ResourceData, meta interface{}) (*jwt.Config, error) {
@ -180,17 +212,17 @@ func loadJwtConfig(d *schema.ResourceData, meta interface{}) (*jwt.Config, error
if strings.TrimSpace(credentials) != "" {
contents, _, err := pathorcontents.Read(credentials)
if err != nil {
return nil, fmt.Errorf("Error loading credentials: %s", err)
return nil, errwrap.Wrapf("Error loading credentials: {{err}}", err)
}
cfg, err := google.JWTConfigFromJSON([]byte(contents), "")
if err != nil {
return nil, fmt.Errorf("Error parsing credentials: \n %s \n Error: %s", contents, err)
return nil, errwrap.Wrapf("Error parsing credentials: {{err}}", err)
}
return cfg, nil
}
return nil, fmt.Errorf("Credentials not found in datasource, provider configuration or GOOGLE_APPLICATION_CREDENTIALS environment variable.")
return nil, errors.New("Credentials not found in datasource, provider configuration or GOOGLE_APPLICATION_CREDENTIALS environment variable.")
}
// parsePrivateKey converts the binary contents of a private key file
@ -208,29 +240,29 @@ func parsePrivateKey(key []byte) (*rsa.PrivateKey, error) {
if err != nil {
parsedKey, err = x509.ParsePKCS1PrivateKey(key)
if err != nil {
return nil, fmt.Errorf("private key should be a PEM or plain PKSC1 or PKCS8; parse error: %v", err)
return nil, errwrap.Wrapf("private key should be a PEM or plain PKSC1 or PKCS8; parse error: {{err}}", err)
}
}
parsed, ok := parsedKey.(*rsa.PrivateKey)
if !ok {
return nil, fmt.Errorf("private key is invalid")
return nil, errors.New("private key is invalid")
}
return parsed, nil
}
// UrlData stores the values required to create a Signed Url
type UrlData struct {
JwtConfig *jwt.Config
ContentMd5 string
ContentType string
HttpMethod string
Expires int
Md5Digest string
HttpHeaders map[string]string
Path string
Signature []byte
}
// Creates a string in the form ready for signing:
// https://cloud.google.com/storage/docs/access-control/create-signed-urls-program
// SigningString creates a string representation of the UrlData in a form ready for signing:
// see https://cloud.google.com/storage/docs/access-control/create-signed-urls-program
// Example output:
// -------------------
// GET
@ -239,59 +271,78 @@ type UrlData struct {
// 1388534400
// bucket/objectname
// -------------------
func (u *UrlData) CreateSigningString() []byte {
func (u *UrlData) SigningString() []byte {
var buf bytes.Buffer
// HTTP VERB
// HTTP Verb
buf.WriteString(u.HttpMethod)
buf.WriteString("\n")
// MD5 digest (optional)
buf.WriteString(u.Md5Digest)
// Content MD5 (optional, always add new line)
buf.WriteString(u.ContentMd5)
buf.WriteString("\n")
// request content-type (optional)
// Content Type (optional, always add new line)
buf.WriteString(u.ContentType)
buf.WriteString("\n")
// signed url expiration
// Expiration
buf.WriteString(strconv.Itoa(u.Expires))
buf.WriteString("\n")
// additional request headers (optional)
// Extra HTTP headers (optional)
// Must be sorted in lexigraphical order
var keys []string
for k := range u.HttpHeaders {
keys = append(keys, strings.ToLower(k))
}
sort.Strings(keys)
// To perform the opertion you want
// Write sorted headers to signing string buffer
for _, k := range keys {
buf.WriteString(fmt.Sprintf("%s:%s\n", k, u.HttpHeaders[k]))
}
// object path
// Storate Object path (includes bucketname)
buf.WriteString(u.Path)
fmt.Printf("SIGNING STRING: \n%s\n", buf.String())
return buf.Bytes()
}
func (u *UrlData) EncodedSignature() string {
func (u *UrlData) Signature() ([]byte, error) {
// Sign url data
signature, err := SignString(u.SigningString(), u.JwtConfig)
if err != nil {
return nil, err
}
return signature, nil
}
// EncodedSignature returns the Signature() after base64 encoding and url escaping
func (u *UrlData) EncodedSignature() (string, error) {
signature, err := u.Signature()
if err != nil {
return "", err
}
// base64 encode signature
encoded := base64.StdEncoding.EncodeToString(u.Signature)
encoded := base64.StdEncoding.EncodeToString(signature)
// encoded signature may include /, = characters that need escaping
encoded = url.QueryEscape(encoded)
return encoded
return encoded, nil
}
// Builds the final signed URL a client can use to retrieve storage object
func (u *UrlData) BuildUrl() string {
// SignedUrl constructs the final signed URL a client can use to retrieve storage object
func (u *UrlData) SignedUrl() (string, error) {
encodedSig, err := u.EncodedSignature()
if err != nil {
return "", err
}
// set url
// build url
// https://cloud.google.com/storage/docs/access-control/create-signed-urls-program
var urlBuffer bytes.Buffer
urlBuffer.WriteString(gcsBaseUrl)
@ -301,16 +352,17 @@ func (u *UrlData) BuildUrl() string {
urlBuffer.WriteString("&Expires=")
urlBuffer.WriteString(strconv.Itoa(u.Expires))
urlBuffer.WriteString("&Signature=")
urlBuffer.WriteString(u.EncodedSignature())
urlBuffer.WriteString(encodedSig)
return urlBuffer.String()
return urlBuffer.String(), nil
}
// SignString calculates the SHA256 signature of the input string
func SignString(toSign []byte, cfg *jwt.Config) ([]byte, error) {
// Parse private key
pk, err := parsePrivateKey(cfg.PrivateKey)
if err != nil {
return nil, fmt.Errorf("could not parse key: %v\nKey:%s", err, string(cfg.PrivateKey))
return nil, errwrap.Wrapf("failed to sign string, could not parse key: {{err}}", err)
}
// Hash string
@ -320,7 +372,7 @@ func SignString(toSign []byte, cfg *jwt.Config) ([]byte, error) {
// Sign string
signed, err := rsa.SignPKCS1v15(rand.Reader, pk, crypto.SHA256, hasher.Sum(nil))
if err != nil {
return nil, fmt.Errorf("error signing string: %s\n", err)
return nil, errwrap.Wrapf("failed to sign string, an error occurred: {{err}}", err)
}
return signed, nil

182
builtin/providers/google/data_source_storage_object_signed_url_test.go
Unescape View File

@ -6,15 +6,15 @@ import (
"bytes"
"encoding/base64"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"github.com/hashicorp/go-cleanhttp"
"github.com/hashicorp/terraform/helper/acctest"
"github.com/hashicorp/terraform/helper/resource"
"github.com/hashicorp/terraform/terraform"
"golang.org/x/oauth2/google"
"io/ioutil"
"net/http"
"net/url"
"strings"
)
const fakeCredentials = `{
@ -64,7 +64,7 @@ func TestUrlData_Signing(t *testing.T) {
}
// create url data signature
toSign := urlData.CreateSigningString()
toSign := urlData.SigningString()
result, err := SignString(toSign, cfg)
if err != nil {
t.Error(err)
@ -77,17 +77,7 @@ func TestUrlData_Signing(t *testing.T) {
}
func TestUrlData_BuildUrl(t *testing.T) {
// unescape and decode the expected signature
encodedSig, err := url.QueryUnescape(testUrlExpectedSignatureBase64Encoded)
if err != nil {
t.Error(err)
}
sig, err := base64.StdEncoding.DecodeString(encodedSig)
if err != nil {
t.Error(err)
}
func TestUrlData_SignedUrl(t *testing.T) {
// load fake service account credentials
cfg, err := google.JWTConfigFromJSON([]byte(fakeCredentials), "")
if err != nil {
@ -98,10 +88,12 @@ func TestUrlData_BuildUrl(t *testing.T) {
HttpMethod: "GET",
Expires: testUrlExpires,
Path: testUrlPath,
Signature: sig,
JwtConfig: cfg,
}
result := urlData.BuildUrl()
result, err := urlData.SignedUrl()
if err != nil {
t.Errorf("Could not generated signed url: %+v", err)
}
if result != testUrlExpectedUrl {
t.Errorf("URL does not match expected value:\n%s\n%s", testUrlExpectedUrl, result)
}
@ -125,24 +117,9 @@ func TestDatasourceSignedUrl_basic(t *testing.T) {
func TestDatasourceSignedUrl_accTest(t *testing.T) {
bucketName := fmt.Sprintf("tf-test-bucket-%d", acctest.RandInt())
resource.Test(t, resource.TestCase{
PreCheck: func() { testAccPreCheck(t) },
Providers: testAccProviders,
Steps: []resource.TestStep{
resource.TestStep{
Config: testAccTestGoogleStorageObjectSingedUrl(bucketName),
Check: resource.ComposeTestCheckFunc(
testAccGoogleSignedUrlRetrieval("data.google_storage_object_signed_url.story_url", nil),
),
},
},
})
}
func TestDatasourceSignedUrl_wHeaders(t *testing.T) {
headers := map[string]string{
"x-goog-test": "foo",
"x-goog-test": "foo",
"x-goog-if-generation-match": "1",
}
resource.Test(t, resource.TestCase{
@ -150,38 +127,11 @@ func TestDatasourceSignedUrl_wHeaders(t *testing.T) {
Providers: testAccProviders,
Steps: []resource.TestStep{
resource.TestStep{
Config: testAccTestGoogleStorageObjectSingedUrl_wHeader(),
Config: testAccTestGoogleStorageObjectSingedUrl(bucketName),
Check: resource.ComposeTestCheckFunc(
testAccGoogleSignedUrlRetrieval("data.google_storage_object_signed_url.story_url", nil),
testAccGoogleSignedUrlRetrieval("data.google_storage_object_signed_url.story_url_w_headers", headers),
),
},
},
})
}
func TestDatasourceSignedUrl_wContentType(t *testing.T) {
resource.Test(t, resource.TestCase{
PreCheck: func() { testAccPreCheck(t) },
Providers: testAccProviders,
Steps: []resource.TestStep{
resource.TestStep{
Config: testAccTestGoogleStorageObjectSingedUrl_wContentType(),
Check: resource.ComposeTestCheckFunc(
testAccGoogleSignedUrlRetrieval("data.google_storage_object_signed_url.story_url_w_content_type", nil),
),
},
},
})
}
func TestDatasourceSignedUrl_wMD5(t *testing.T) {
resource.Test(t, resource.TestCase{
PreCheck: func() { testAccPreCheck(t) },
Providers: testAccProviders,
Steps: []resource.TestStep{
resource.TestStep{
Config: testAccTestGoogleStorageObjectSingedUrl_wMD5(),
Check: resource.ComposeTestCheckFunc(
testAccGoogleSignedUrlRetrieval("data.google_storage_object_signed_url.story_url_w_md5", nil),
),
},
@ -189,35 +139,6 @@ func TestDatasourceSignedUrl_wMD5(t *testing.T) {
})
}
// formatRequest generates ascii representation of a request
func formatRequest(r *http.Request) string {
// Create return string
var request []string
request = append(request, "--------")
// Add the request string
url := fmt.Sprintf("%v %v %v", r.Method, r.URL, r.Proto)
request = append(request, url)
// Add the host
request = append(request, fmt.Sprintf("Host: %v", r.Host))
// Loop through headers
for name, headers := range r.Header {
//name = strings.ToLower(name)
for _, h := range headers {
request = append(request, fmt.Sprintf("%v: %v", name, h))
}
}
// If this is a POST, add post data
if r.Method == "POST" {
r.ParseForm()
request = append(request, "\n")
request = append(request, r.Form.Encode())
}
request = append(request, "--------")
// Return the request as a string
return strings.Join(request, "\n")
}
func testAccGoogleSignedUrlExists(n string) resource.TestCheckFunc {
return func(s *terraform.State) error {
@ -244,43 +165,37 @@ func testAccGoogleSignedUrlRetrieval(n string, headers map[string]string) resour
return fmt.Errorf("signed_url is empty: %v", a)
}
// create HTTP request
url := a["signed_url"]
fmt.Printf("URL: %s\n", url)
method := a["http_method"]
req, _ := http.NewRequest(method, url, nil)
// Apply custom headers to request
// Add extension headers to request, if provided
for k, v := range headers {
fmt.Printf("Adding Header (%s: %s)\n", k, v)
req.Header.Set(k, v)
}
// content_type is optional, add to test query if provided in datasource config
contentType := a["content_type"]
if contentType != "" {
fmt.Printf("Adding Content-Type: %s\n", contentType)
req.Header.Add("Content-Type", contentType)
}
md5Digest := a["md5_digest"]
if md5Digest != "" {
fmt.Printf("Adding Content-MD5: %s\n", md5Digest)
req.Header.Add("Content-MD5", md5Digest)
// content_md5 is optional, add to test query if provided in datasource config
contentMd5 := a["content_md5"]
if contentMd5 != "" {
req.Header.Add("Content-MD5", contentMd5)
}
// send request to GET object using signed url
// send request using signed url
client := cleanhttp.DefaultClient()
// Print request
//dump, _ := httputil.DumpRequest(req, true)
//fmt.Printf("%+q\n", strings.Replace(string(dump), "\\n", "\n", 99))
fmt.Printf("%s\n", formatRequest(req))
response, err := client.Do(req)
if err != nil {
return err
}
defer response.Body.Close()
// check content in response, should be our test string or XML with error
body, err := ioutil.ReadAll(response.Body)
if err != nil {
return err
@ -318,42 +233,15 @@ data "google_storage_object_signed_url" "story_url" {
bucket = "${google_storage_bucket.bucket.name}"
path = "${google_storage_bucket_object.story.name}"
}`, bucketName)
}
func testAccTestGoogleStorageObjectSingedUrl_wHeader() string {
return fmt.Sprintf(`
resource "google_storage_bucket" "bucket" {
name = "tf-signurltest-%s"
}
resource "google_storage_bucket_object" "story" {
name = "path/to/file"
bucket = "${google_storage_bucket.bucket.name}"
content = "once upon a time..."
}
data "google_storage_object_signed_url" "story_url_w_headers" {
bucket = "${google_storage_bucket.bucket.name}"
path = "${google_storage_bucket_object.story.name}"
http_headers {
extension_headers {
x-goog-test = "foo"
x-goog-if-generation-match = 1
}
}`, acctest.RandString(6))
}
func testAccTestGoogleStorageObjectSingedUrl_wContentType() string {
return fmt.Sprintf(`
resource "google_storage_bucket" "bucket" {
name = "tf-signurltest-%s"
}
resource "google_storage_bucket_object" "story" {
name = "path/to/file"
bucket = "${google_storage_bucket.bucket.name}"
content = "once upon a time..."
}
data "google_storage_object_signed_url" "story_url_w_content_type" {
@ -361,26 +249,12 @@ data "google_storage_object_signed_url" "story_url_w_content_type" {
path = "${google_storage_bucket_object.story.name}"
content_type = "text/plain"
}`, acctest.RandString(6))
}
func testAccTestGoogleStorageObjectSingedUrl_wMD5() string {
return fmt.Sprintf(`
resource "google_storage_bucket" "bucket" {
name = "tf-signurltest-%s"
}
resource "google_storage_bucket_object" "story" {
name = "path/to/file"
bucket = "${google_storage_bucket.bucket.name}"
content = "once upon a time..."
}
data "google_storage_object_signed_url" "story_url_w_md5" {
bucket = "${google_storage_bucket.bucket.name}"
path = "${google_storage_bucket_object.story.name}"
md5_digest = "${google_storage_bucket_object.story.md5hash}"
}`, acctest.RandString(6))
content_md5 = "${google_storage_bucket_object.story.md5hash}"
}`, bucketName)
}

37
website/source/docs/providers/google/d/signed_url.html.markdown
Unescape View File

@ -14,7 +14,7 @@ For more info about signed URL's is available [here](https://cloud.google.com/st
## Example Usage
```
```hcl
data "google_storage_object_signed_url" "artifact" {
bucket = "install_binaries"
path = "path/to/install_file.bin"
@ -27,7 +27,7 @@ resource "google_compute_instance" "vm" {
provisioner "remote-exec" {
inline = [
"wget ${data.google_storage_object_signed_url.artifact.signed_url}",
"wget '${data.google_storage_object_signed_url.artifact.signed_url}' -O install_file.bin",
"chmod +x install_file.bin",
"./install_file.bin"
]
@ -35,6 +35,23 @@ resource "google_compute_instance" "vm" {
}
```
## Full Example
```hcl
data "google_storage_object_signed_url" "get_url" {
bucket = "fried_chicken"
path = "path/to/file"
content_md5 = "pRviqwS4c4OTJRTe03FD1w=="
content_type = "text/plain"
duration = "2d"
credentials = "${file("path/to/credentials.json")}"
extension_headers {
x-goog-if-generation-match = 1
}
}
```
## Argument Reference
The following arguments are supported:
@ -42,10 +59,20 @@ The following arguments are supported:
* `bucket` - (Required) The name of the bucket to read the object from
* `path` - (Required) The full path to the object inside the bucket
* `http_method` - (Optional) What HTTP Method will the signed URL allow (defaults to `GET`)
* `duration` - (Optional) For how long shall the signed URL be valid (defaults to 1 hour `1h`). See [here](https://golang.org/pkg/time/#ParseDuration) for info on valid duration formats.
* `credentials` - (Optional) What Google service account credentials json should be used to sign the URL. This data source checks the following locations for credentials, in order of preference: data source `credentials` attribute, provider `credentials` attribute and finally the GOOGLE_APPLICATION_CREDENTIALS environment variable.
* `duration` - (Optional) For how long shall the signed URL be valid (defaults to 1 hour - i.e. `1h`).
See [here](https://golang.org/pkg/time/#ParseDuration) for info on valid duration formats.
* `credentials` - (Optional) What Google service account credentials json should be used to sign the URL.
This data source checks the following locations for credentials, in order of preference: data source `credentials` attribute, provider `credentials` attribute and finally the GOOGLE_APPLICATION_CREDENTIALS environment variable.
> **NOTE** the default google credentials configured by `gcloud` sdk or the service account associated with a compute instance cannot be used, because these do not include the private key required to sign the URL. A valid `json` service account credentials key file must be used, as generated via Google cloud console.
* `content_type` - (Optional) If you specify this in the datasource, the client must provide the `Content-Type` HTTP header with the same value in its request.
* `content_md5` - (Optional) The [MD5 digest](https://cloud.google.com/storage/docs/hashes-etags#_MD5) value in Base64.
Typically retrieved from `google_storage_bucket_object.object.md5hash` attribute.
If you provide this in the datasource, the client (e.g. browser, curl) must provide the `Content-MD5` HTTP header with this same value in its request.
* `extension_headers` - (Optional) As needed. The server checks to make sure that the client provides matching values in requests using the signed URL.
Any header starting with `x-goog-` is accepted but see the [Google Docs](https://cloud.google.com/storage/docs/xml-api/reference-headers) for list of headers that are supported by Google.
## Attributes Reference

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