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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182import { AtUri } from "@atproto/syntax";import type { NormalizedDocument } from "lexicons/src/normalize";import type { Profile } from "src/identity/profileCache";
/** A trimmed profile shape sufficient for rendering a byline. */export type BylineProfile = { did: string; handle: string | null; displayName: string | null;};
/** * Returns the ordered list of DIDs that should appear in a post's byline. * * When the document has a non-empty `contributors` array, their DIDs are used * (in order). Otherwise it falls back to the single `fallbackAuthorDid` — the * document author / publication owner (the host of the document AT-URI, which * equals publication.identity_did). */export function getBylineDids( doc: Pick<NormalizedDocument, "contributors"> | null | undefined, fallbackAuthorDid: string,): string[] { const contributors = doc?.contributors; if (contributors && contributors.length > 0) return contributors.map((c) => c.did); return [fallbackAuthorDid];}
/** * Whether a document has an *explicit* byline that differs from the lone * publication owner. Returns false when the only byline DID is the owner (or * there are no contributors), so consumers fall back to byte-for-byte the * previous single-author behavior. Returns true otherwise. * * This is the single source of truth for the "has contributors" decision used * by the post page, broadcast email, and post-list rendering. */export function hasExplicitByline( doc: Pick<NormalizedDocument, "contributors"> | null | undefined, ownerDid: string,): boolean { const dids = getBylineDids(doc, ownerDid); return !(dids.length === 1 && dids[0] === ownerDid);}
/** * Resolves an ordered list of byline DIDs to trimmed byline profiles * (preserving order), given a map produced by `getProfiles`. DIDs without a * resolved profile keep null handle/displayName so callers can decide how to * present (or drop) them. */export function toBylineProfiles( dids: string[], profiles: Map<string, Pick<Profile, "handle" | "displayName"> | null>,): BylineProfile[] { return dids.map((did) => { const p = profiles.get(did); return { did, handle: p?.handle ?? null, displayName: p?.displayName ?? null, }; });}
/** * Keeps only contributors that resolve to a real name (displayName or handle), * dropping any that are bare DIDs. The single source of truth for "is this * byline presentable", shared by every byline renderer so an unresolved profile * never produces an empty clickable span or an orphan separator. */export function namedBylineProfiles( contributors: BylineProfile[] | undefined,): BylineProfile[] { return (contributors ?? []).filter((c) => c.displayName || c.handle);}
/** Best display label for a profile: displayName, else handle, else did. */export function bylineName( profile: Pick<Profile, "did" | "handle" | "displayName">,): string { return profile.displayName || profile.handle || profile.did;}
/** * The separator that should precede the byline name at `index` in a list of * `count` names. The single source of truth for join punctuation, shared by * `formatBylineNames` (plain strings) and JSX consumers that interleave * components between names. * * index 0 -> "" * last of 2 -> " and " * last of 3+ -> ", and " * any other (middle) position -> ", " */export function bylineSeparator(index: number, count: number): string { if (index === 0) return ""; if (index === count - 1) return count > 2 ? ", and " : " and "; return ", ";}
/** * Joins byline names in a human-friendly way: * ["A"] -> "A" * ["A", "B"] -> "A and B" * ["A", "B", "C"] -> "A, B, and C" */export function formatBylineNames(names: string[]): string { return names.reduce( (acc, name, i) => acc + bylineSeparator(i, names.length) + name, "", );}
/** A post with the minimum fields needed to resolve its byline. */type BylinePost = { uri: string; record: Pick<NormalizedDocument, "contributors">;};
/** The author DID for a post — the host of its document AT-URI, or null. */function postOwnerDid(uri: string): string | null { try { return new AtUri(uri).host; } catch { return null; }}
/** * All distinct byline DIDs across a set of posts — each post's contributors * when present, otherwise its author (the AT-URI host). Use to batch a single * `getProfiles` lookup before attaching per-post byline profiles. */export function bylineDidsForPosts(posts: BylinePost[]): string[] { const dids = new Set<string>(); for (const post of posts) { const owner = postOwnerDid(post.uri); if (!owner) continue; for (const did of getBylineDids(post.record, owner)) dids.add(did); } return Array.from(dids);}
/** * Attaches resolved `bylineProfiles` (in byline order) to each post, given a * map of did -> profile such as the one returned by `getProfiles`. Posts whose * URI can't be parsed get an empty list. Used by the server render paths so * post-list bylines land in the initial HTML instead of being fetched on the * client. */export function attachBylineProfiles<T extends BylinePost>( posts: T[], profiles: Map<string, Pick<Profile, "handle" | "displayName"> | null>,): (T & { bylineProfiles: BylineProfile[] })[] { return posts.map((post) => { const owner = postOwnerDid(post.uri); return { ...post, bylineProfiles: owner ? toBylineProfiles(getBylineDids(post.record, owner), profiles) : [], }; });}
/** * Resolves byline profiles to a single human-friendly name string, dropping * any that only resolve to a bare DID (unresolved profile). Returns undefined * when nothing presentable remains. Shared by the broadcast email and preview * email senders. */export function formatBylineProfiles( profiles: BylineProfile[],): string | undefined { let names = profiles .map(bylineName) .filter((name) => !name.startsWith("did:")); return names.length > 0 ? formatBylineNames(names) : undefined;}