Add basic memory-based session driver

src/http/session/MemorySession.ts

@@ -0,0 +1,61 @@
+import {NoSessionKeyError, Session, SessionData, SessionNotLoadedError} from "./Session";
+import {Injectable} from "@extollo/di";
+
+@Injectable()
+export class MemorySession extends Session {
+    private static sessionsByID: {[key: string]: SessionData} = {}
+
+    private static getSession(id: string) {
+        if ( !this.sessionsByID[id] ) {
+            this.sessionsByID[id] = {} as SessionData
+        }
+
+        return this.sessionsByID[id]
+    }
+
+    private static setSession(id: string, data: SessionData) {
+        this.sessionsByID[id] = data
+    }
+
+    protected sessionID?: string
+    protected data?: SessionData
+
+    public getKey(): string {
+        if ( !this.sessionID ) throw new NoSessionKeyError()
+        return this.sessionID
+    }
+
+    public setKey(key: string) {
+        this.sessionID = key
+    }
+
+    public load() {
+        if ( !this.sessionID ) throw new NoSessionKeyError()
+        this.data = MemorySession.getSession(this.sessionID)
+    }
+
+    public persist() {
+        if ( !this.sessionID ) throw new NoSessionKeyError()
+        if ( !this.data ) throw new SessionNotLoadedError()
+        MemorySession.setSession(this.sessionID, this.data)
+    }
+
+    public getData(): SessionData {
+        if ( !this.data ) throw new SessionNotLoadedError()
+        return this.data
+    }
+
+    public setData(data: SessionData) {
+        this.data = data
+    }
+
+    public get(key: string, fallback?: any): any {
+        if ( !this.data ) throw new SessionNotLoadedError()
+        return this.data?.[key] ?? fallback
+    }
+
+    public set(key: string, value: any) {
+        if ( !this.data ) throw new SessionNotLoadedError()
+        this.data[key] = value
+    }
+}