Extract helper functions from LoginPage

Change-Id: I507e223d0eff00bac3963d0b71f9bd648b9ab7b1

src/synapse/synapse.js

@@ -0,0 +1,48 @@
+import { fetchUtils } from "react-admin";
+
+export const splitMxid = mxid => {
+  const re =
+    /^@(?<name>[a-zA-Z0-9._=\-/]+):(?<domain>[a-zA-Z0-9\-.]+\.[a-zA-Z]+)$/;
+  return re.exec(mxid)?.groups;
+};
+
+export const isValidBaseUrl = baseUrl =>
+  /^(http|https):\/\/[a-zA-Z0-9\-.]+(:\d{1,5})?$/.test(baseUrl);
+
+/**
+ * Resolve the homeserver URL using the well-known lookup
+ * @param domain  the domain part of an MXID
+ * @returns homeserver base URL
+ */
+export const getWellKnownUrl = async domain => {
+  const wellKnownUrl = `https://${domain}/.well-known/matrix/client`;
+  try {
+    const json = await fetchUtils.fetchJson(wellKnownUrl, { method: "GET" });
+    return json["m.homeserver"].base_url;
+  } catch {
+    // if there is no .well-known entry, return the domain itself
+    return `https://${domain}`;
+  }
+};
+
+/**
+ * Get synapse server version
+ * @param base_url  the base URL of the homeserver
+ * @returns server version
+ */
+export const getServerVersion = async baseUrl => {
+  const versionUrl = `${baseUrl}/_synapse/admin/v1/server_version`;
+  const response = await fetchUtils.fetchJson(versionUrl, { method: "GET" });
+  return response.json.server_version;
+};
+
+/**
+ * Get supported login flows
+ * @param baseUrl  the base URL of the homeserver
+ * @returns array of supported login flows
+ */
+export const getSupportedLoginFlows = async baseUrl => {
+  const loginFlowsUrl = `${baseUrl}/_matrix/client/r0/login`;
+  const response = await fetchUtils.fetchJson(loginFlowsUrl, { method: "GET" });
+  return response.json.flows;
+};

src/synapse/synapse.test.js

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+import { isValidBaseUrl, splitMxid } from "./synapse";
+
+describe("splitMxid", () => {
+  it("splits valid MXIDs", () =>
+    expect(splitMxid("@name:domain.tld")).toEqual({
+      name: "name",
+      domain: "domain.tld",
+    }));
+  it("rejects invalid MXIDs", () => expect(splitMxid("foo")).toBeUndefined());
+});
+
+describe("isValidBaseUrl", () => {
+  it("accepts a http URL", () =>
+    expect(isValidBaseUrl("http://foo.bar")).toBeTruthy());
+  it("accepts a https URL", () =>
+    expect(isValidBaseUrl("https://foo.bar")).toBeTruthy());
+  it("accepts a valid URL with port", () =>
+    expect(isValidBaseUrl("https://foo.bar:1234")).toBeTruthy());
+  it("rejects undefined base URLs", () =>
+    expect(isValidBaseUrl(undefined)).toBeFalsy());
+  it("rejects null base URLs", () => expect(isValidBaseUrl(null)).toBeFalsy());
+  it("rejects empty base URLs", () => expect(isValidBaseUrl("")).toBeFalsy());
+  it("rejects non-string base URLs", () =>
+    expect(isValidBaseUrl({})).toBeFalsy());
+  it("rejects base URLs without protocol", () =>
+    expect(isValidBaseUrl("foo.bar")).toBeFalsy());
+  it("rejects base URLs with path", () =>
+    expect(isValidBaseUrl("http://foo.bar/path")).toBeFalsy());
+  it("rejects invalid base URLs", () =>
+    expect(isValidBaseUrl("http:/foo.bar")).toBeFalsy());
+});