Stop sending nodeType to servers that have no such property

Uploading a file or creating a folder failed on the live 0.15.5 server with
`invalidProperties (nodeType)`. The property arrived in Stalwart 0.16; before
that a FileNode has no nodeType at all, and the create is refused outright.

Older servers tell a file from a directory a different way: the node carries
file properties or it does not. Setting blobId, size or type — even to null —
makes it a file, so a directory there is exactly parentId plus name.

0.16 is also the first release to advertise urn:stalwart:jmap and no earlier
one knows that capability, so its presence stands in for "has the newer
FileNode shape". Creates, and the property lists we ask for, are shaped from
that.

The read side needed it too: a server that never reports nodeType would have
had every folder drawn with a file icon, sorted among the files and opening as
a download. Nodes are normalised as they arrive, so everything downstream can
still just read nodeType.

web/src/lib/__tests__/filenode.test.ts

@@ -0,0 +1,83 @@
+import { afterEach, describe, expect, it } from "vitest";
+import { client } from "@/jmap/client";
+import { directoryCreate, fileCreate, fileNodeProps, supportsNodeType, withNodeType } from "../filenode";
+import type { FileNode, JmapSession } from "@/jmap/types";
+
+/**
+ * `nodeType` arrived in Stalwart 0.16. Sending it to an older server fails the
+ * whole create with `invalidProperties (nodeType)` — which is what uploading a
+ * file or making a folder hit on the live 0.15.5 box. Those servers tell a file
+ * from a directory by whether it carries file properties at all.
+ */
+
+function session(caps: string[]): JmapSession {
+  return { capabilities: Object.fromEntries(caps.map((c) => [c, {}])), accounts: {}, primaryAccounts: {}, state: "s" } as unknown as JmapSession;
+}
+
+const NEW_SERVER = ["urn:ietf:params:jmap:core", "urn:ietf:params:jmap:filenode", "urn:stalwart:jmap"];
+const OLD_SERVER = ["urn:ietf:params:jmap:core", "urn:ietf:params:jmap:filenode"];
+
+afterEach(() => {
+  client.session = null;
+});
+
+describe("on Stalwart 0.16 and newer", () => {
+  it("uses nodeType everywhere", () => {
+    client.session = session(NEW_SERVER);
+    expect(supportsNodeType()).toBe(true);
+    expect(fileNodeProps()).toContain("nodeType");
+    expect(directoryCreate(null, "ihasmail")).toEqual({ parentId: null, name: "ihasmail", nodeType: "directory" });
+    expect(fileCreate("d1", "logo.png", "b1", "image/png")).toEqual({ parentId: "d1", name: "logo.png", blobId: "b1", type: "image/png", nodeType: "file" });
+  });
+
+  it("leaves what the server reported alone", () => {
+    client.session = session(NEW_SERVER);
+    const nodes = [{ id: "1", name: "x", nodeType: "directory" }] as Partial<FileNode>[];
+    expect(withNodeType(nodes)).toEqual(nodes);
+  });
+});
+
+describe("on Stalwart before 0.16", () => {
+  it("never mentions nodeType, in creates or in requested properties", () => {
+    client.session = session(OLD_SERVER);
+    expect(supportsNodeType()).toBe(false);
+    expect(fileNodeProps()).not.toContain("nodeType");
+    expect(directoryCreate(null, "ihasmail")).toEqual({ parentId: null, name: "ihasmail" });
+    expect(JSON.stringify(fileCreate("d1", "logo.png", "b1", "image/png"))).not.toContain("nodeType");
+  });
+
+  it("keeps a directory free of file properties, which is what makes it one", () => {
+    client.session = session(OLD_SERVER);
+    const dir = directoryCreate(null, "ihasmail");
+    // Setting blobId, size or type — even to null — would make this a file.
+    expect(dir).not.toHaveProperty("blobId");
+    expect(dir).not.toHaveProperty("size");
+    expect(dir).not.toHaveProperty("type");
+  });
+
+  it("still sends what a file needs", () => {
+    client.session = session(OLD_SERVER);
+    expect(fileCreate("d1", "logo.png", "b1", "image/png")).toEqual({ parentId: "d1", name: "logo.png", blobId: "b1", type: "image/png" });
+  });
+
+  it("works out nodeType from the file properties, so folders stay folders", () => {
+    client.session = session(OLD_SERVER);
+    const out = withNodeType([
+      { id: "1", name: "Documents", blobId: null, size: null, type: null },
+      { id: "2", name: "notes.txt", blobId: "b1", size: 11, type: "text/plain" },
+      { id: "3", name: "empty.txt", blobId: "b2", size: 0, type: null },
+    ] as Partial<FileNode>[]);
+    expect(out.map((n) => n.nodeType)).toEqual(["directory", "file", "file"]);
+  });
+
+  it("does not overwrite a nodeType that did come back", () => {
+    client.session = session(OLD_SERVER);
+    const out = withNodeType([{ id: "1", name: "x", nodeType: "symlink", blobId: "b1" }] as Partial<FileNode>[]);
+    expect(out[0]!.nodeType).toBe("symlink");
+  });
+});
+
+it("assumes the older shape when there is no session yet", () => {
+  client.session = null;
+  expect(supportsNodeType()).toBe(false);
+});