feat: oauth client for signatures

Author: Vexcited

src/iut/signatures/index.ts

@@ -0,0 +1,62 @@
+import type { HttpResponse } from "schwi";
+import { HttpRequest, HttpRequestRedirection, send } from "schwi";
+import { CAS, OAuth2 } from "~cas";
+
+export class Signatures {
+  public static readonly COOKIE = "session";
+
+  public static readonly HOST = "https://signatures.unilim.fr";
+  public static readonly oauth2 = new OAuth2("signatures", "https://signatures.unilim.fr/callback", ["openid", "profile"]);
+
+  public constructor(
+    public readonly session: string
+  ) {}
+
+  public static async fromCAS(cas: CAS): Promise<Signatures> {
+    let request: HttpRequest, response: HttpResponse;
+    let session: string, state: string;
+
+    {
+      request = new HttpRequest.Builder(Signatures.HOST + "/login")
+        .setRedirection(HttpRequestRedirection.MANUAL)
+        .enableUnauthorizedTLS()
+        .build();
+
+      response = await send(request);
+
+      const cookies = response.headers.getSetCookie();
+      const cookie = cookies.find((cookie) => cookie.startsWith(Signatures.COOKIE + "="));
+
+      if (!cookie)
+        throw new Error("session cookie not found");
+
+      session = cookie.split(";")[0].split("=")[1];
+
+      const location = new URL(response.headers.get("location")!);
+      state = location.searchParams.get("state")!;
+    }
+
+    {
+      const callback = await cas.authorize(Signatures.oauth2, false, state);
+
+      request = new HttpRequest.Builder(callback)
+        .setRedirection(HttpRequestRedirection.MANUAL)
+        .setCookie(Signatures.COOKIE, session)
+        .setCookie(CAS.COOKIE, cas.lemonldap)
+        .enableUnauthorizedTLS()
+        .build();
+
+      response = await send(request);
+
+      const cookies = response.headers.getSetCookie();
+      const cookie = cookies.find((cookie) => cookie.startsWith(Signatures.COOKIE + "="));
+
+      if (!cookie)
+        throw new Error("session cookie not found");
+
+      session = cookie.split(";")[0].split("=")[1];
+    }
+
+    return new Signatures(session);
+  }
+}