feat: add OAuth2 applications (#11197)

* Add database tables for OAuth2 applications

These are applications that will be able to use OAuth2 to get an API key
from Coder.

* Add endpoints for managing OAuth2 applications

These let you add, update, and remove OAuth2 applications.

* Add frontend for managing OAuth2 applications

coderd/database/migrations/000182_oauth2_provider.down.sql

@@ -0,0 +1,2 @@
+DROP TABLE oauth2_provider_app_secrets;
+DROP TABLE oauth2_provider_apps;

coderd/database/migrations/000182_oauth2_provider.up.sql

@@ -0,0 +1,25 @@
+CREATE TABLE oauth2_provider_apps (
+    id uuid NOT NULL,
+    created_at timestamp with time zone NOT NULL,
+    updated_at timestamp with time zone NOT NULL,
+    name varchar(64) NOT NULL,
+    icon varchar(256) NOT NULL,
+    callback_url text NOT NULL,
+    PRIMARY KEY (id),
+    UNIQUE(name)
+);
+
+COMMENT ON TABLE oauth2_provider_apps IS 'A table used to configure apps that can use Coder as an OAuth2 provider, the reverse of what we are calling external authentication.';
+
+CREATE TABLE oauth2_provider_app_secrets (
+    id uuid NOT NULL,
+    created_at timestamp with time zone NOT NULL,
+    last_used_at timestamp with time zone NULL,
+    hashed_secret bytea NOT NULL,
+    display_secret text NOT NULL,
+    app_id uuid NOT NULL REFERENCES oauth2_provider_apps (id) ON DELETE CASCADE,
+    PRIMARY KEY (id),
+    UNIQUE(app_id, hashed_secret)
+);
+
+COMMENT ON COLUMN oauth2_provider_app_secrets.display_secret IS 'The tail end of the original secret so secrets can be differentiated.';

coderd/database/migrations/testdata/fixtures/000182_oauth2_provider.up.sql

@@ -0,0 +1,21 @@
+INSERT INTO oauth2_provider_apps
+	(id, created_at, updated_at, name, icon, callback_url)
+VALUES (
+	'a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11',
+	'2023-06-15 10:23:54+00',
+	'2023-06-15 10:23:54+00',
+	'oauth2-app',
+	'/some/icon.svg',
+	'http://coder.com/oauth2/callback'
+);
+
+INSERT INTO oauth2_provider_app_secrets
+	(id, created_at, last_used_at, hashed_secret, display_secret, app_id)
+VALUES (
+	'b0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11',
+	'2023-06-15 10:25:33+00',
+	'2023-12-15 11:40:20+00',
+	CAST('abcdefg' AS bytea),
+	'fg',
+	'a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11'
+);