Add Okta oauth provider

src/providers/okta.ts

@@ -0,0 +1,95 @@
+import { OAuth2Provider, OAuth2ProviderConfig } from "./oauth2";
+
+export interface OktaAddress {
+  street_address: string;
+  locality: string;
+  region: string;
+  postal_code: string;
+  country: string;
+}
+
+export interface OktaProfile {
+  sub: string;
+  name: string;
+  nickname: string;
+  given_name: string;
+  middle_name: string;
+  family_name: string;
+  profile: string;
+  zoneinfo: string;
+  locale: string;
+  updated_at: number;
+  email: string;
+  email_verified: boolean;
+  address: OktaAddress;
+  phone_number: string;
+}
+
+export interface OktaTokens {
+  access_token: string;
+  code: string;
+  error: string;
+  error_description: string;
+  expires_in: string;
+  id_token: string;
+  scope: string;
+  state: string;
+  token_type: string;
+}
+
+type OktaOAuth2ProviderConfig = OAuth2ProviderConfig<OktaProfile, OktaTokens>;
+
+interface OktaRequiredConfig extends OktaOAuth2ProviderConfig {
+  oktaDomain: string;
+  authorizationServer?: string;
+}
+
+const defaultConfig: Partial<OktaRequiredConfig> = {
+  id: "okta",
+  scope: ["openid", "profile", "email"],
+  accessTokenUrl: "/v1/token",
+  authorizationUrl: "/v1/authorize",
+  profileUrl: "/v1/userinfo",
+  authorizationServer: "default",
+  contentType: "application/x-www-form-urlencoded",
+};
+
+/**
+ * Sign in with Okta. Requires the `oktaDomain` parameter.
+ * Default authorization server value is `default`
+ */
+export class OktaOAuth2Provider extends OAuth2Provider<
+  OktaProfile,
+  OktaTokens,
+  OktaOAuth2ProviderConfig
+> {
+  constructor(config: OktaRequiredConfig) {
+    /**
+     * Either generate full okta urls using the required oktaDomain,
+     * or pull them directly from the values in
+     * `config.accessTokenUrl`, `config.authorizationUrl`, or `config.profileUrl`
+     */
+    const constructedUrls: Partial<OktaOAuth2ProviderConfig> = {
+      accessTokenUrl:
+        config.accessTokenUrl ||
+        `https://${config.oktaDomain}/oauth2/${
+          config.authorizationServer || defaultConfig.authorizationServer
+        }${defaultConfig.accessTokenUrl}`,
+      authorizationUrl:
+        config.authorizationUrl ||
+        `https://${config.oktaDomain}/oauth2/${
+          config.authorizationServer || defaultConfig.authorizationServer
+        }${defaultConfig.authorizationUrl}`,
+      profileUrl:
+        config.profileUrl ||
+        `https://${config.oktaDomain}/oauth2/${
+          config.authorizationServer || defaultConfig.authorizationServer
+        }${defaultConfig.profileUrl}`,
+    };
+    super({
+      ...defaultConfig,
+      ...constructedUrls,
+      ...config,
+    });
+  }
+}