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|
package credentials
import (
"context"
"fmt"
"net/http"
"net/url"
"strings"
"github.com/openfga/go-sdk/oauth2/clientcredentials"
)
const ApiTokenHeaderKey = "Authorization"
const ApiTokenHeaderValuePrefix = "Bearer"
// Available credential methods
type CredentialsMethod string
const (
// No credentials (default)
CredentialsMethodNone CredentialsMethod = "none"
// API Token credentials (will be sent in "Authorization: Bearer $TOKEN" header)
CredentialsMethodApiToken CredentialsMethod = "api_token"
// Client Credentials flow will be performed, resulting token will be sent in "Authorization: Bearer $TOKEN" header
CredentialsMethodClientCredentials CredentialsMethod = "client_credentials"
)
type Config struct {
ApiToken string `json:"apiToken,omitempty"`
ClientCredentialsApiTokenIssuer string `json:"apiTokenIssuer,omitempty"`
ClientCredentialsApiAudience string `json:"apiAudience,omitempty"`
ClientCredentialsClientId string `json:"clientId,omitempty"`
ClientCredentialsClientSecret string `json:"clientSecret,omitempty"`
ClientCredentialsScopes string `json:"scopes,omitempty"`
}
type Credentials struct {
Method CredentialsMethod `json:"method,omitempty"`
Config *Config `json:"config,omitempty"`
Context context.Context
}
func NewCredentials(config Credentials) (*Credentials, error) {
creds := &Credentials{
Method: config.Method,
Config: config.Config,
}
if creds.Method == "" {
creds.Method = CredentialsMethodNone
}
err := creds.ValidateCredentialsConfig()
if err != nil {
return nil, err
}
return creds, nil
}
func (c *Credentials) ValidateCredentialsConfig() error {
conf := c.Config
if c.Method == CredentialsMethodApiToken && (conf == nil || conf.ApiToken == "") {
return fmt.Errorf("CredentialsConfig.ApiToken is required when CredentialsMethod is CredentialsMethodApiToken (%s)", c.Method)
} else if c.Method == CredentialsMethodClientCredentials {
if conf == nil ||
conf.ClientCredentialsClientId == "" ||
conf.ClientCredentialsClientSecret == "" ||
conf.ClientCredentialsApiTokenIssuer == "" {
return fmt.Errorf("all of CredentialsConfig.ClientId, CredentialsConfig.ClientSecret and CredentialsConfig.ApiTokenIssuer are required when CredentialsMethod is CredentialsMethodClientCredentials (%s)", c.Method)
}
tokenURL, err := buildApiTokenURL(conf.ClientCredentialsApiTokenIssuer)
if err != nil {
return err
}
conf.ClientCredentialsApiTokenIssuer = tokenURL
}
return nil
}
type HeaderParams struct {
Key string
Value string
}
func (c *Credentials) GetApiTokenHeader() *HeaderParams {
if c.Method != CredentialsMethodApiToken {
return nil
}
return &HeaderParams{
Key: ApiTokenHeaderKey,
Value: ApiTokenHeaderValuePrefix + " " + c.Config.ApiToken,
}
}
// GetHttpClientAndHeaderOverrides
// The main export the client uses to get a configuration with the necessary
// httpClient and header overrides based on the chosen credential method
func (c *Credentials) GetHttpClientAndHeaderOverrides() (*http.Client, []*HeaderParams) {
var headers []*HeaderParams
var client = http.DefaultClient
switch c.Method {
case CredentialsMethodClientCredentials:
ccConfig := clientcredentials.Config{
ClientID: c.Config.ClientCredentialsClientId,
ClientSecret: c.Config.ClientCredentialsClientSecret,
TokenURL: c.Config.ClientCredentialsApiTokenIssuer,
}
if c.Config.ClientCredentialsApiAudience != "" {
ccConfig.EndpointParams = map[string][]string{
"audience": {c.Config.ClientCredentialsApiAudience},
}
}
if c.Config.ClientCredentialsScopes != "" {
scopes := strings.Split(strings.TrimSpace(c.Config.ClientCredentialsScopes), " ")
ccConfig.Scopes = append(ccConfig.Scopes, scopes...)
}
if c.Context == nil {
c.Context = context.Background()
}
client = ccConfig.Client(c.Context)
case CredentialsMethodApiToken:
var header = c.GetApiTokenHeader()
if header != nil {
headers = append(headers, header)
}
case CredentialsMethodNone:
default:
}
return client, headers
}
var defaultTokenEndpointPath = "oauth/token"
func buildApiTokenURL(issuer string) (string, error) {
u, err := url.Parse(issuer)
if err != nil {
return "", err
}
if u.Scheme == "" {
u, _ = url.Parse(fmt.Sprintf("https://%s", issuer))
} else if u.Scheme != "http" && u.Scheme != "https" {
return "", fmt.Errorf("invalid issuer scheme '%s' (must be http or https)", u.Scheme)
}
if u.Path == "" || u.Path == "/" {
u.Path = defaultTokenEndpointPath
}
return u.String(), nil
}
|
