Prototype API (#1)

* Add oauth2 client

* Update LICENSE.txt

* Create .env.example

* Add dotenv to example

* Add oauth2 types

* Update lib.rs

* Update Cargo.toml

* Update lib.rs

* Add games routes

src/oauth2.rs

@@ -0,0 +1,153 @@
+// Copyright (c) Tribufu. All Rights Reserved.
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Copy, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum OAuth2ResponseType {
+    Code,
+    Token,
+}
+
+#[derive(Debug, Copy, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum OAuth2ClientType {
+    Confidential,
+    Public,
+}
+
+#[derive(Debug, Copy, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum OAuth2TokenHintType {
+    AccessToken,
+    RefreshToken,
+}
+
+#[derive(Debug, Copy, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum OAuth2GrantType {
+    AuthorizationCode,
+    ClientCredentials,
+    DeviceCode,
+    Password,
+    RefreshToken,
+}
+
+#[derive(Debug, Copy, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum OAuth2AuthorizeError {
+    AccessDenied,
+    InvalidRequest,
+    InvalidScope,
+    ServerError,
+    TemporarilyUnavailable,
+    UnauthorizedClient,
+    UnsupportedResponseType,
+}
+
+#[derive(Debug, Copy, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum OAuth2TokenType {
+    Bearer,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct OAuth2AuthorizeRequest {
+    pub response_type: OAuth2ResponseType,
+    pub client_id: String,
+    pub client_secret: Option<String>,
+    pub redirect_uri: String,
+    pub scope: Option<String>,
+    pub state: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct OAuth2CodeResponse {
+    pub code: String,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub state: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct OAuth2ErrorResponse {
+    pub error: OAuth2AuthorizeError,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub error_description: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub error_uri: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub state: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct OAuth2TokenRequest {
+    pub grant_type: OAuth2GrantType,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub code: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub refresh_token: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub username: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub password: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub client_id: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub client_secret: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub redirect_uri: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub server_id: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct OAuth2TokenResponse {
+    pub token_type: OAuth2TokenType,
+    pub access_token: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub refresh_token: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub scope: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub state: Option<String>,
+    pub expires_in: u64,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct OAuth2RevokeRequest {
+    pub token: String,
+    pub token_type_hint: OAuth2TokenHintType,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct OAuth2IntrospectionResponse {
+    pub active: bool,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub client_id: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub username: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub scope: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub exp: Option<i64>,
+}
+
+impl OAuth2IntrospectionResponse {
+    fn inative() -> Self {
+        Self {
+            active: false,
+            client_id: None,
+            username: None,
+            scope: None,
+            exp: None,
+        }
+    }
+}