Move domain stuff to sub directory, clean up base classes

packages/domain/src/kinds/RelayJoin.ts

@@ -0,0 +1,66 @@
+import {first} from "@welshman/lib"
+import {RELAY_JOIN, getTagValue} from "@welshman/util"
+import type {ISigner} from "@welshman/signer"
+import {EventReader} from "../EventReader.js"
+import {EventBuilder} from "../EventBuilder.js"
+
+// Ephemeral kind-28934 relay/space join request. Both written (the join flow)
+// and read (membership status): it carries an optional invite "claim" tag and a
+// free-text reason in the event content, driving the space membership state
+// machine (RELAY_JOIN -> Pending/Granted). The content is the plain free-text
+// reason.
+export class RelayJoin extends EventReader {
+  readonly kind = RELAY_JOIN
+
+  claim() {
+    return getTagValue("claim", this.event.tags)
+  }
+
+  reason() {
+    return this.event.content || undefined
+  }
+
+  builder() {
+    return new RelayJoinBuilder(this)
+  }
+}
+
+export class RelayJoinBuilder extends EventBuilder<RelayJoin> {
+  readonly kind = RELAY_JOIN
+
+  claim?: string
+  reason?: string
+
+  constructor(readonly reader?: RelayJoin) {
+    super(reader)
+
+    const claim = first(this.consumeTags("claim"))
+
+    this.claim = claim?.[1]
+    this.reason = reader?.event.content || undefined
+  }
+
+  setClaim(claim: string) {
+    this.claim = claim
+
+    return this
+  }
+
+  setReason(reason: string) {
+    this.reason = reason
+
+    return this
+  }
+
+  protected buildTags() {
+    const tags: string[][] = []
+
+    if (this.claim) tags.push(["claim", this.claim])
+
+    return tags
+  }
+
+  protected buildContent(_signer?: ISigner) {
+    return this.reason || ""
+  }
+}