add firestore terraform

Assists people who want to self-host and need particular firestore config

go/firestore.rules

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+rules_version = '2';
+service cloud.firestore {
+  match /databases/{database}/documents {
+
+    // Per-human membership mirror maintained by Orion's service account.
+    // Locked from clients so the membership list cannot leak or be mutated.
+    match /humans/{humanId} {
+      allow read, write: if false;
+    }
+
+    // Particles: caller must be a current member of the network in the path.
+    // get() on the mirror is cached across rule evaluations within a single
+    // request, so this costs 1 billed read per request regardless of query size.
+    match /networks/{networkId}/children/{particleId=**} {
+      allow read, write: if request.auth != null
+        && networkId in get(/databases/$(database)/documents/humans/$(request.auth.uid)).data.networks;
+    }
+  }
+}

go/firestore.tf

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+resource "google_firebase_project" "default" {
+  provider = google-beta
+  project  = var.project_id
+
+  depends_on = [module.project-services]
+}
+
+# Provisions the Firestore database instance.
+resource "google_firestore_database" "firestore" {
+  provider = google-beta
+  project  = google_firebase_project.default.project
+  name     = "(default)"
+  # See available locations: https://firebase.google.com/docs/firestore/locations
+  location_id = var.location
+  # "FIRESTORE_NATIVE" is required to use Firestore with Firebase SDKs, authentication, and Firebase Security Rules.
+  type             = "FIRESTORE_NATIVE"
+  concurrency_mode = "OPTIMISTIC"
+}
+
+resource "google_firebaserules_ruleset" "default" {
+  provider = google-beta
+  project  = google_firestore_database.firestore.project
+  source {
+    files {
+      name = "firestore.rules"
+      # Write security rules in a local file named "firestore.rules".
+      # Learn more: https://firebase.google.com/docs/firestore/security/get-started
+      content = file("firestore.rules")
+    }
+  }
+}
+
+resource "google_firebaserules_release" "firestore" {
+  provider     = google-beta
+  name         = "cloud.firestore"
+  ruleset_name = google_firebaserules_ruleset.default.name
+  project      = google_firestore_database.firestore.project
+}
+
+resource "google_firebase_web_app" "llink" {
+  provider     = google-beta
+  project      = google_firebase_project.default.project
+  display_name = "Llink app"
+}
+
+data "google_firebase_web_app_config" "llink" {
+  provider   = google-beta
+  project    = var.project_id
+  web_app_id = google_firebase_web_app.llink.app_id
+}
+
+// Below indices support the new structure where all subcollections (including network root particles) live under a collection of name "children"
+// instead of having `network/n_xxx/particles/p_yyy/children` where the top level subcollection of particles has a distinct name
+
+// Collection index for particles in a single subcollection
+resource "google_firestore_index" "list_particles_index" {
+  project     = var.project_id
+  collection  = "children"
+  query_scope = "COLLECTION"
+
+  fields {
+    field_path   = "visible_to"
+    array_config = "CONTAINS"
+  }
+
+  fields {
+    field_path = "status"
+    order      = "ASCENDING"
+  }
+
+  fields {
+    field_path = "last_child_created_at"
+    order      = "DESCENDING"
+  }
+
+  fields {
+    field_path = "__name__"
+    order      = "DESCENDING"
+  }
+
+  depends_on = [google_firestore_database.firestore]
+}
+
+// Collection group index for particles across all subcollections
+resource "google_firestore_field" "particle_children_created_at" {
+  database   = google_firestore_database.firestore.name
+  project    = var.project_id
+  collection = "children"
+  field      = "created_at"
+
+  index_config {
+    indexes {
+      order       = "DESCENDING"
+      query_scope = "COLLECTION_GROUP"
+    }
+    indexes {
+      order       = "ASCENDING"
+      query_scope = "COLLECTION_GROUP"
+    }
+    indexes {
+      order       = "DESCENDING"
+      query_scope = "COLLECTION"
+    }
+    indexes {
+      order       = "ASCENDING"
+      query_scope = "COLLECTION"
+    }
+  }
+}