Merge pull request #234 from Coffey-Labs/feat/ldif-duplicate-report

Say how much an LDIF re-import duplicated, without acting on it

web/src/locales/de.ts

@@ -1079,6 +1079,7 @@ export const catalog: Catalog = {
     "Nothing unread here": "Hier ist nichts ungelesen",
   },
   plurals: {
+    "{n} of them look like contacts you already had": { one: "{n} davon sieht aus wie ein Kontakt, den Sie schon hatten", other: "{n} davon sehen aus wie Kontakte, die Sie schon hatten" },
     "Your administrator changed {n} settings": { one: "Ihre Administration hat {n} Einstellung geändert", other: "Ihre Administration hat {n} Einstellungen geändert" },
     "Already here: {n} contacts, nothing imported": { one: "Bereits vorhanden: {n} Kontakt, nichts importiert", other: "Bereits vorhanden: {n} Kontakte, nichts importiert" },
     "All {n} are already in your contacts": { one: "Bereits in Ihren Kontakten", other: "Alle {n} sind bereits in Ihren Kontakten" },

web/src/locales/es.ts

@@ -1052,6 +1052,7 @@ export const catalog: Catalog = {
     "Nothing unread here": "Aquí no hay nada sin leer",
   },
   plurals: {
+    "{n} of them look like contacts you already had": { one: "{n} de ellos se parece a un contacto que ya tenías", other: "{n} de ellos se parecen a contactos que ya tenías" },
     "Your administrator changed {n} settings": { one: "Tu administración cambió {n} ajuste", other: "Tu administración cambió {n} ajustes" },
     "Already here: {n} contacts, nothing imported": { one: "Ya estaba aquí: {n} contacto, no se importó nada", other: "Ya estaban aquí: {n} contactos, no se importó nada" },
     "All {n} are already in your contacts": { one: "Ya está en tus contactos", other: "Los {n} ya están en tus contactos" },

web/src/locales/fr.ts

@@ -1057,6 +1057,7 @@ export const catalog: Catalog = {
     "Nothing unread here": "Rien de non lu ici",
   },
   plurals: {
+    "{n} of them look like contacts you already had": { one: "{n} d’entre eux ressemble à un contact que vous aviez déjà", other: "{n} d’entre eux ressemblent à des contacts que vous aviez déjà" },
     "Your administrator changed {n} settings": { one: "Votre administration a modifié {n} paramètre", other: "Votre administration a modifié {n} paramètres" },
     "Already here: {n} contacts, nothing imported": { one: "Déjà présent : {n} contact, rien d’importé", other: "Déjà présents : {n} contacts, rien d’importé" },
     "All {n} are already in your contacts": { one: "Déjà dans vos contacts", other: "Les {n} sont déjà dans vos contacts" },

web/src/locales/ja.ts

@@ -1060,6 +1060,7 @@ export const catalog: Catalog = {
     "Nothing unread here": "ここに未読はありません",
   },
   plurals: {
+    "{n} of them look like contacts you already had": { other: "うち {n} 件はすでにある連絡先に似ています" },
     "Your administrator changed {n} settings": { other: "管理者が {n} 件の設定を変更しました" },
     "Already here: {n} contacts, nothing imported": { other: "すでに存在: {n} 件、インポートなし" },
     "All {n} are already in your contacts": { other: "{n} 件はすでに連絡先にあります" },

web/src/locales/nl.ts

@@ -1048,6 +1048,7 @@ export const catalog: Catalog = {
     "Nothing unread here": "Hier is niets ongelezen",
   },
   plurals: {
+    "{n} of them look like contacts you already had": { one: "{n} daarvan lijkt op een contact dat u al had", other: "{n} daarvan lijken op contacten die u al had" },
     "Your administrator changed {n} settings": { one: "Uw beheerder heeft {n} instelling gewijzigd", other: "Uw beheerder heeft {n} instellingen gewijzigd" },
     "Already here: {n} contacts, nothing imported": { one: "Al aanwezig: {n} contact, niets geïmporteerd", other: "Al aanwezig: {n} contacten, niets geïmporteerd" },
     "All {n} are already in your contacts": { one: "Staat al in uw contacten", other: "Alle {n} staan al in uw contacten" },

web/src/locales/pt-BR.ts

@@ -1055,6 +1055,7 @@ export const catalog: Catalog = {
     "Nothing unread here": "Não há nada não lido aqui",
   },
   plurals: {
+    "{n} of them look like contacts you already had": { one: "{n} deles parece um contato que você já tinha", other: "{n} deles parecem contatos que você já tinha" },
     "Your administrator changed {n} settings": { one: "Sua administração alterou {n} configuração", other: "Sua administração alterou {n} configurações" },
     "Already here: {n} contacts, nothing imported": { one: "Já estava aqui: {n} contato, nada importado", other: "Já estavam aqui: {n} contatos, nada importado" },
     "All {n} are already in your contacts": { one: "Já está nos seus contatos", other: "Todos os {n} já estão nos seus contatos" },

web/src/locales/ru.ts

@@ -1054,6 +1054,7 @@ export const catalog: Catalog = {
     "Nothing unread here": "Здесь нет непрочитанного",
   },
   plurals: {
+    "{n} of them look like contacts you already had": { one: "{n} из них похож на контакт, который уже был", few: "{n} из них похожи на контакты, которые уже были", many: "{n} из них похожи на контакты, которые уже были", other: "{n} из них похожи на контакты, которые уже были" },
     "Your administrator changed {n} settings": { one: "Администратор изменил {n} настройку", few: "Администратор изменил {n} настройки", many: "Администратор изменил {n} настроек", other: "Администратор изменил {n} настройки" },
     "Already here: {n} contacts, nothing imported": { one: "Уже есть: {n} контакт, ничего не импортировано", few: "Уже есть: {n} контакта, ничего не импортировано", many: "Уже есть: {n} контактов, ничего не импортировано", other: "Уже есть: {n} контакта, ничего не импортировано" },
     "All {n} are already in your contacts": { one: "Уже в ваших контактах", few: "Все {n} уже в ваших контактах", many: "Все {n} уже в ваших контактах", other: "Все {n} уже в ваших контактах" },

web/src/locales/uk.ts

@@ -1048,6 +1048,7 @@ export const catalog: Catalog = {
     "Nothing unread here": "Тут немає непрочитаного",
   },
   plurals: {
+    "{n} of them look like contacts you already had": { one: "{n} з них схожий на контакт, який уже був", few: "{n} з них схожі на контакти, які вже були", many: "{n} з них схожі на контакти, які вже були", other: "{n} з них схожі на контакти, які вже були" },
     "Your administrator changed {n} settings": { one: "Адміністратор змінив {n} налаштування", few: "Адміністратор змінив {n} налаштування", many: "Адміністратор змінив {n} налаштувань", other: "Адміністратор змінив {n} налаштування" },
     "Already here: {n} contacts, nothing imported": { one: "Уже є: {n} контакт, нічого не імпортовано", few: "Уже є: {n} контакти, нічого не імпортовано", many: "Уже є: {n} контактів, нічого не імпортовано", other: "Уже є: {n} контакти, нічого не імпортовано" },
     "All {n} are already in your contacts": { one: "Уже у ваших контактах", few: "Усі {n} уже у ваших контактах", many: "Усі {n} уже у ваших контактах", other: "Усі {n} уже у ваших контактах" },

web/src/locales/zh-Hans.ts

@@ -1059,6 +1059,7 @@ export const catalog: Catalog = {
     "Nothing unread here": "这里没有未读邮件",
   },
   plurals: {
+    "{n} of them look like contacts you already had": { other: "其中 {n} 个与您已有的联系人相似" },
     "Your administrator changed {n} settings": { other: "管理员更改了 {n} 项设置" },
     "Already here: {n} contacts, nothing imported": { other: "已存在 {n} 个，未导入" },
     "All {n} are already in your contacts": { other: "这 {n} 个已在您的联系人中" },

web/src/store/__tests__/contact-set-batching.test.ts

@@ -100,14 +100,14 @@ afterEach(() => {
 describe("importing an LDIF bigger than the server will take at once", () => {
   it("splits it into calls the server will accept, and files all of it", async () => {
     const sets = server({ max: MAX });
-    await expect(useContacts.getState().importLdif(ldifOf(1200), "book1")).resolves.toEqual({ created: 1200, skipped: 0 });
+    await expect(useContacts.getState().importLdif(ldifOf(1200), "book1")).resolves.toEqual({ created: 1200, skipped: 0, alike: 0 });
     expect(sizes(sets)).toEqual([500, 500, 200]);
   });
 
   it("splits by what the session advertises, not by a number of its own", async () => {
     client.session!.capabilities[CAP.core] = { maxObjectsInGet: 40, maxObjectsInSet: 40 };
     const sets = server({ max: 40 });
-    await expect(useContacts.getState().importLdif(ldifOf(100), "book1")).resolves.toEqual({ created: 100, skipped: 0 });
+    await expect(useContacts.getState().importLdif(ldifOf(100), "book1")).resolves.toEqual({ created: 100, skipped: 0, alike: 0 });
     expect(sizes(sets)).toEqual([40, 40, 20]);
   });
 
@@ -134,7 +134,7 @@ describe("importing an LDIF bigger than the server will take at once", () => {
 describe("importing a vCard file bigger than the server will take at once", () => {
   it("splits it into calls the server will accept, and files all of it", async () => {
     const sets = server({ max: MAX, parsed: vcardsOf(1200) });
-    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 1200, skipped: 0 });
+    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 1200, skipped: 0, alike: 0 });
     expect(sizes(sets)).toEqual([500, 500, 200]);
   });
 
@@ -155,7 +155,7 @@ describe("importing a vCard file bigger than the server will take at once", () =
 
   it("counts what got in when only some of it did", async () => {
     server({ max: MAX, parsed: vcardsOf(2), notCreated: { c1: { type: "invalidProperties" } } });
-    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 1, skipped: 0 });
+    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 1, skipped: 0, alike: 0 });
   });
 });
 

web/src/store/__tests__/ldif-import.test.ts

@@ -63,7 +63,7 @@ describe("importing an LDIF address book", () => {
   it("creates every entry in one call, not one call each", async () => {
     const sets = server();
     const n = await useContacts.getState().importLdif(TWO, "book1");
-    expect(n).toEqual({ created: 2, skipped: 0 });
+    expect(n).toEqual({ created: 2, skipped: 0, alike: 0 });
     expect(sets).toHaveLength(1);
     expect(Object.keys(sets[0]!.create!)).toEqual(["c0", "c1"]);
   });
@@ -105,7 +105,7 @@ describe("importing an LDIF address book", () => {
   it("skips entries too empty to be a person, and imports the rest", async () => {
     const sets = server();
     const n = await useContacts.getState().importLdif(`${TWO}\ndn: cn=Nobody\nobjectClass: top\n`, "book1");
-    expect(n).toEqual({ created: 2, skipped: 0 });
+    expect(n).toEqual({ created: 2, skipped: 0, alike: 0 });
     expect(Object.keys(sets[0]!.create!)).toHaveLength(2);
   });
 
@@ -116,6 +116,6 @@ describe("importing an LDIF address book", () => {
 
   it("counts what got in when only some of it did", async () => {
     server({ notCreated: { c1: { type: "invalidProperties" } } });
-    await expect(useContacts.getState().importLdif(TWO, "book1")).resolves.toEqual({ created: 1, skipped: 0 });
+    await expect(useContacts.getState().importLdif(TWO, "book1")).resolves.toEqual({ created: 1, skipped: 0, alike: 0 });
   });
 });

web/src/store/__tests__/ldif-likeness.test.ts

@@ -0,0 +1,138 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { CAP, client } from "@/jmap/client";
+import { useContacts } from "@/store/contacts";
+import type { ContactCard, JmapSession } from "@/jmap/types";
+
+/*
+ * Counting look-alikes on an LDIF import, without acting on them.
+ *
+ * Mozilla's schema has no UID, so the import invents one and a re-import
+ * duplicates everything. Whether to guess an identity from a name and an
+ * address is still open on #223 -- and the harm that was actually reported was
+ * confusion rather than duplication: somebody imports a file twice and cannot
+ * tell what happened. So this counts and says so, and imports every card
+ * regardless. Reporting is not matching.
+ */
+
+interface SetArgs { create?: Record<string, Record<string, unknown>> }
+
+function server(existing: Array<Partial<ContactCard> & { id: string }>) {
+  const sets: SetArgs[] = [];
+  const fetchMock = vi.fn(async (_url: string, init: RequestInit) => {
+    const body = JSON.parse(init.body as string) as { methodCalls: [string, Record<string, unknown>, string][] };
+    const methodResponses = body.methodCalls.map(([name, args, id]) => {
+      if (name === "ContactCard/query") {
+        const position = (args.position as number) ?? 0;
+        return [name, { accountId: "a1", queryState: "1", canCalculateChanges: false, position, ids: position ? [] : existing.map((c) => c.id), total: existing.length }, id];
+      }
+      if (name === "ContactCard/get") {
+        const want = new Set((args.ids as string[]) ?? []);
+        return [name, { accountId: "a1", state: "1", list: existing.filter((c) => want.has(c.id)), notFound: [] }, id];
+      }
+      if (name === "ContactCard/set") {
+        sets.push({ create: args.create as Record<string, Record<string, unknown>> });
+        return [name, {
+          accountId: "a1", oldState: "1", newState: "2",
+          created: Object.fromEntries(Object.keys((args.create ?? {}) as object).map((k) => [k, { id: `new-${k}` }])),
+          notCreated: {},
+        }, id];
+      }
+      return [name, { accountId: "a1", state: "1", list: [], notFound: [], ids: [], total: 0, queryState: "q", position: 0, canCalculateChanges: false }, id];
+    });
+    return { ok: true, status: 200, json: async () => ({ methodResponses, sessionState: "1" }) } as Response;
+  });
+  vi.stubGlobal("fetch", fetchMock);
+  return sets;
+}
+
+/** A card already in the book, with the two fields likeness is read from. */
+const card = (id: string, full: string, ...emails: string[]) => ({
+  id, uid: `uid-${id}`, addressBookIds: { book1: true },
+  name: { full },
+  emails: Object.fromEntries(emails.map((address, i) => [`e${i}`, { address }])),
+}) as unknown as Partial<ContactCard> & { id: string };
+
+const entry = (cn: string, mail: string) =>
+  `dn: cn=${cn}\ngivenName: ${cn.split(" ")[0]}\nsn: ${cn.split(" ").slice(-1)[0]}\ncn: ${cn}\nmail: ${mail}\n`;
+
+beforeEach(() => {
+  client.session = {
+    capabilities: { [CAP.core]: { maxObjectsInGet: 500, maxObjectsInSet: 500 }, [CAP.contacts]: {} },
+    accounts: {}, primaryAccounts: {}, state: "s1",
+  } as unknown as JmapSession;
+  useContacts.setState({ accountId: "a1", available: true, books: {}, cards: {} as Record<string, ContactCard> });
+});
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+  vi.restoreAllMocks();
+});
+
+describe("telling somebody what an LDIF re-import duplicated", () => {
+  it("counts an entry that matches an existing card on name and address", async () => {
+    server([card("c1", "Jane Doe", "[email protected]")]);
+    const r = await useContacts.getState().importLdif(entry("Jane Doe", "[email protected]"), "book1");
+    expect(r).toEqual({ created: 1, skipped: 0, alike: 1 });
+  });
+
+  it("imports it anyway, which is the whole point of counting rather than matching", async () => {
+    const sets = server([card("c1", "Jane Doe", "[email protected]")]);
+    await useContacts.getState().importLdif(entry("Jane Doe", "[email protected]"), "book1");
+    expect(Object.keys(sets[0]!.create!)).toHaveLength(1);
+  });
+
+  it("does not count a name match with a different address", async () => {
+    // Two people who share a name are two people. This is exactly the guess
+    // the counting refuses to make on anyone's behalf.
+    server([card("c1", "Jane Doe", "[email protected]")]);
+    const r = await useContacts.getState().importLdif(entry("Jane Doe", "[email protected]"), "book1");
+    expect(r.alike).toBe(0);
+  });
+
+  it("does not count an address match under a different name", async () => {
+    server([card("c1", "Someone Else", "[email protected]")]);
+    const r = await useContacts.getState().importLdif(entry("Jane Doe", "[email protected]"), "book1");
+    expect(r.alike).toBe(0);
+  });
+
+  it("recognises a match on a second address", async () => {
+    server([card("c1", "Jane Doe", "[email protected]", "[email protected]")]);
+    const r = await useContacts.getState().importLdif(entry("Jane Doe", "[email protected]"), "book1");
+    expect(r.alike).toBe(1);
+  });
+
+  it("ignores case and spacing, which an export and a hand-typed card differ in", async () => {
+    server([card("c1", "  JANE DOE ", "[email protected]")]);
+    const r = await useContacts.getState().importLdif(entry("Jane Doe", "[email protected]"), "book1");
+    expect(r.alike).toBe(1);
+  });
+
+  it("counts each entry once however many of its addresses match", async () => {
+    server([card("c1", "Jane Doe", "[email protected]", "[email protected]")]);
+    const two = `dn: cn=Jane Doe\ncn: Jane Doe\nmail: [email protected]\nmozillaSecondEmail: [email protected]\n`;
+    const r = await useContacts.getState().importLdif(two, "book1");
+    expect(r.alike).toBe(1);
+  });
+
+  it("looks only at the book being imported into", async () => {
+    const elsewhere = { ...card("c1", "Jane Doe", "[email protected]"), addressBookIds: { book2: true } };
+    server([elsewhere]);
+    const r = await useContacts.getState().importLdif(entry("Jane Doe", "[email protected]"), "book1");
+    expect(r.alike).toBe(0);
+  });
+
+  it("counts nothing against an empty book", async () => {
+    server([]);
+    const r = await useContacts.getState().importLdif(entry("Jane Doe", "[email protected]"), "book1");
+    expect(r).toEqual({ created: 1, skipped: 0, alike: 0 });
+  });
+
+  it("does not count the file against itself", async () => {
+    // Two of the same person in one file are two new cards, not a duplicate of
+    // something that was already here. The scan is read before anything lands.
+    server([]);
+    const twice = entry("Jane Doe", "[email protected]") + "\n" + entry("Jane Doe", "[email protected]");
+    const r = await useContacts.getState().importLdif(twice, "book1");
+    expect(r).toEqual({ created: 2, skipped: 0, alike: 0 });
+  });
+});

web/src/store/__tests__/vcard-dedupe.test.ts

@@ -73,7 +73,7 @@ afterEach(() => {
 describe("re-importing vCards the book already has", () => {
   it("skips a card whose uid is already in this book", async () => {
     const sets = server({ parsed: [card("ada@x", "Ada"), card("alan@x", "Alan")], existing: [here("ada@x")] });
-    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 1, skipped: 1 });
+    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 1, skipped: 1, alike: 0 });
     expect(Object.values(sets[0]!.create!).map((c) => (c.name as { full: string }).full)).toEqual(["Alan"]);
   });
 
@@ -81,26 +81,26 @@ describe("re-importing vCards the book already has", () => {
     // The same person legitimately filed in two address books is not a
     // duplicate, any more than the same event in two calendars is.
     const sets = server({ parsed: [card("ada@x", "Ada")], existing: [here("ada@x", "book2")] });
-    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 1, skipped: 0 });
+    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 1, skipped: 0, alike: 0 });
     expect(Object.keys(sets[0]!.create!)).toHaveLength(1);
   });
 
   it("imports a card that arrived with no uid, rather than guessing at one", async () => {
     const noUid = { "@type": "Card", version: "1.0", kind: "individual", name: { full: "Anon" } };
     const sets = server({ parsed: [noUid], existing: [here("ada@x")] });
-    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 1, skipped: 0 });
+    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 1, skipped: 0, alike: 0 });
     expect(Object.values(sets[0]!.create!)[0]!.uid).toEqual(expect.any(String));
   });
 
   it("sends nothing at all when the whole file is already here", async () => {
     const sets = server({ parsed: [card("ada@x", "Ada"), card("alan@x", "Alan")], existing: [here("ada@x"), here("alan@x")] });
-    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 0, skipped: 2 });
+    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 0, skipped: 2, alike: 0 });
     expect(sets).toHaveLength(0);
   });
 
   it("imports everything into an empty book", async () => {
     const sets = server({ parsed: [card("ada@x", "Ada"), card("alan@x", "Alan")] });
-    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 2, skipped: 0 });
+    await expect(useContacts.getState().importVCard("BEGIN:VCARD", "book1")).resolves.toEqual({ created: 2, skipped: 0, alike: 0 });
     expect(Object.keys(sets[0]!.create!)).toHaveLength(2);
   });
 });
@@ -116,6 +116,6 @@ describe("LDIF, which has nothing to match on", () => {
      * name and an address instead is the open question on #223.
      */
     server({ existing: [here("anything")] });
-    await expect(useContacts.getState().importLdif(TWO, "book1")).resolves.toEqual({ created: 2, skipped: 0 });
+    await expect(useContacts.getState().importLdif(TWO, "book1")).resolves.toEqual({ created: 2, skipped: 0, alike: 0 });
   });
 });

web/src/store/contacts.ts

@@ -41,22 +41,53 @@ import { useMail } from "./mail";
  * happens to be holding costs one pass over a list nobody imports into twice a
  * day.
  */
-async function uidsInBook(accountId: Id, addressBookId: Id): Promise<Set<string>> {
+async function scanBook(accountId: Id, addressBookId: Id): Promise<{ uids: Set<string>; likeness: Set<string> }> {
   const uids = new Set<string>();
+  const likeness = new Set<string>();
   const page = client.maxObjectsInGet;
   for (let position = 0; ; ) {
     const q = await client.call<QueryResponse>("ContactCard/query", { accountId, position, limit: page, calculateTotal: true });
     const ids = q.ids ?? [];
     if (!ids.length) break;
     for (const part of chunk(ids, page)) {
-      const g = await client.call<GetResponse<ContactCard>>("ContactCard/get", { accountId, ids: part, properties: ["uid", "addressBookIds"] });
-      for (const c of g.list) if (c.uid && c.addressBookIds?.[addressBookId]) uids.add(c.uid);
+      const g = await client.call<GetResponse<ContactCard>>("ContactCard/get", { accountId, ids: part, properties: ["uid", "addressBookIds", "name", "emails"] });
+      for (const c of g.list) {
+        if (!c.addressBookIds?.[addressBookId]) continue;
+        if (c.uid) uids.add(c.uid);
+        for (const key of likenessKeys(c)) likeness.add(key);
+      }
     }
     position += ids.length;
     // `total` is optional, so the empty page above is what actually ends this.
     if (q.total != null && position >= q.total) break;
   }
-  return uids;
+  return { uids, likeness };
+}
+
+/**
+ * What makes two cards *look* like the same person -- name and one address.
+ *
+ * Deliberately not used to skip or merge anything. It is a guess, and it is
+ * wrong in both directions: two colleagues who share a name and a shared alias
+ * collapse into one, and somebody whose address changed since the last export
+ * looks like a stranger. Either mistake is silent and one of them is
+ * unrecoverable, which is why #223 leaves the decision open.
+ *
+ * Counting is a different act from acting. An LDIF re-import duplicates
+ * everything -- Mozilla's schema has no UID, so the import invents one and
+ * nothing can match -- and the reported harm was confusion rather than data
+ * loss: somebody imports a file twice and cannot tell what happened. Being told
+ * "40 of these look like contacts you already had" answers that without
+ * touching a single card.
+ *
+ * One key per address, so a person whose second address matches is still
+ * recognised.
+ */
+function likenessKeys(c: Partial<ContactCard>): string[] {
+  const name = contactDisplayName(c as ContactCard).trim().toLowerCase();
+  if (!name) return [];
+  const addresses = Object.values(c.emails ?? {}).map((e) => e.address?.trim().toLowerCase()).filter(Boolean);
+  return addresses.map((a) => `${name}\u0000${a}`);
 }
 
 async function createCards(accountId: Id, create: Record<string, unknown>): Promise<{ created: number; refused?: SetError }> {
@@ -154,7 +185,7 @@ interface ContactsState {
   updateBook(id: Id, patch: Partial<AddressBook>): Promise<void>;
   destroyBook(id: Id): Promise<void>;
   /** Import vCards, skipping any whose UID this book already holds. */
-  importVCard(text: string, addressBookId: Id): Promise<{ created: number; skipped: number }>;
+  importVCard(text: string, addressBookId: Id): Promise<{ created: number; skipped: number; alike: number }>;
   /**
    * Import an address book in LDIF, read against Mozilla's schema.
    *
@@ -162,7 +193,7 @@ interface ContactsState {
    * recognise a re-import by. Answered in the same shape as the vCard import so
    * the caller does not have to know which one it called.
    */
-  importLdif(text: string, addressBookId: Id): Promise<{ created: number; skipped: number }>;
+  importLdif(text: string, addressBookId: Id): Promise<{ created: number; skipped: number; alike: number }>;
   loadPrincipals(): Promise<void>;
   suggest(query: string, limit?: number): Promise<Suggestion[]>;
   addRecent(addrs: EmailAddress[]): void;
@@ -460,7 +491,7 @@ export const useContacts = create<ContactsState>((set, get) => ({
     const entry = parsed.parsed?.[up.blobId];
     const cards: ContactCard[] = entry ? (Array.isArray(entry) ? entry : [entry]) : [];
     if (!cards.length) throw new Error("No contacts found in file");
-    const already = await uidsInBook(accountId, addressBookId);
+    const already = (await scanBook(accountId, addressBookId)).uids;
     const create: Record<string, unknown> = {};
     let skipped = 0;
     cards.forEach((c, i) => {
@@ -482,7 +513,7 @@ export const useContacts = create<ContactsState>((set, get) => ({
     // The whole file was already here. Nothing to send, and nothing wrong.
     if (!Object.keys(create).length) {
       await get().loadAll();
-      return { created: 0, skipped };
+      return { created: 0, skipped, alike: 0 };
     }
     try {
       const { created, refused } = await createCards(accountId, create);
@@ -490,7 +521,9 @@ export const useContacts = create<ContactsState>((set, get) => ({
       // though the file had been empty. The LDIF import said this already; a
       // vCard import that quietly returned 0 was the odd one out.
       if (!created) throw new Error(refused ? setErrorMessage(refused) : "the server did not accept any of its contacts");
-      return { created, skipped };
+      /* No likeness count here: a vCard carries a UID, so anything that was
+         already present was skipped by name above rather than guessed at. */
+      return { created, skipped, alike: 0 };
     } finally {
       await get().loadAll();
     }
@@ -509,8 +542,16 @@ export const useContacts = create<ContactsState>((set, get) => ({
     const accountId = get().accountId!;
     const cards = parseLdif(text).map(cardFromLdif).filter((c): c is Partial<ContactCard> => c !== null);
     if (!cards.length) throw new Error("it has no contacts in it");
+    /*
+     * Read before anything is created, so "already had" means before this
+     * import rather than including it. Every card here is imported either way;
+     * this only counts.
+     */
+    const before = await scanBook(accountId, addressBookId);
+    let alike = 0;
     const create: Record<string, unknown> = {};
     cards.forEach((c, i) => {
+      if (likenessKeys(c).some((k) => before.likeness.has(k))) alike++;
       // Built here rather than read from the file: LDIF identifies an entry by
       // its distinguished name, which says where it sat in somebody's
       // directory and is no use as a contact's identity anywhere else.
@@ -529,8 +570,13 @@ export const useContacts = create<ContactsState>((set, get) => ({
      * here because Mozilla's schema does not define one, so a re-import has no
      * identity to be recognised by -- see #223, where whether to guess at one
      * from a name and an address is still an open question.
+     *
+     * `alike` is what can be said without answering it: how many of these look
+     * like contacts that were already here. Reporting is not matching -- every
+     * card was imported -- and it is the confusion rather than the duplication
+     * that was reported as the harm.
      */
-    return { created, skipped: 0 };
+    return { created, skipped: 0, alike };
   },
 
   async loadPrincipals() {

web/src/views/contacts/ContactsView.tsx

@@ -136,7 +136,7 @@ export function ContactsView({ id }: { id?: string }) {
        * LDIF may arrive as .ldif, .ldi, .txt or with no extension at all, and
        * the name is the least reliable thing about it.
        */
-      const { created, skipped } = /^\s*BEGIN:VCARD/im.test(text)
+      const { created, skipped, alike } = /^\s*BEGIN:VCARD/im.test(text)
         ? await contacts.importVCard(text, book.id)
         : await contacts.importLdif(text, book.id);
       /*
@@ -149,6 +149,18 @@ export function ContactsView({ id }: { id?: string }) {
       if (!created) toast.success(plural(skipped, { one: "Already here: {n} contact, nothing imported", other: "Already here: {n} contacts, nothing imported" }));
       else if (skipped) toast.success(`${imported} · ${plural(skipped, { one: "{n} was already here", other: "{n} were already here" })}`);
       else toast.success(imported);
+      /*
+       * Said separately, and after, because it is a different kind of fact.
+       * LDIF has no UID to match on, so nothing was skipped and nothing was
+       * merged -- these are simply here twice now, and saying so is the whole
+       * of what can honestly be said without guessing (#223).
+       */
+      if (alike) {
+        toast.show(plural(alike, {
+          one: "{n} of them looks like a contact you already had",
+          other: "{n} of them look like contacts you already had",
+        }), { duration: 9000 });
+      }
     } catch (err) {
       toast.error(translate("Could not import this file: {error}", { error: (err as Error).message }));
     }