Add LookupResources example (#158)

Author: ivanauth

examples/v1/lookup_resources.rb

@@ -0,0 +1,65 @@
+require 'authzed'
+
+# Initialize the client
+client = Authzed::Api::V1::Client.new(
+  target: 'grpc.authzed.com:443',
+  interceptors: [Authzed::GrpcUtil::BearerToken.new(token: 'mytoken')],
+)
+
+# Define the subject (the user we're checking for)
+emilia = Authzed::Api::V1::SubjectReference.new(
+  object: Authzed::Api::V1::ObjectReference.new(
+    object_type: 'blog/user',
+    object_id: 'emilia'
+  )
+)
+
+# Create a LookupResources request to find all posts that emilia can read
+request = Authzed::Api::V1::LookupResourcesRequest.new(
+  resource_object_type: 'blog/post',
+  permission: 'read',
+  subject: emilia,
+  consistency: Authzed::Api::V1::Consistency.new(
+    fully_consistent: true
+  )
+)
+
+# LookupResources returns a streaming response
+# Collect all resource IDs into an array
+resources = []
+
+puts "Looking up resources that emilia can read..."
+
+client.permissions_service.lookup_resources(request) do |response|
+  # Each response contains one resource ID
+  resource_id = response.resource_object_id
+  resources << resource_id
+  puts "Found resource: #{resource_id}"
+end
+
+puts "\nTotal resources found: #{resources.length}"
+puts "Resource IDs: #{resources.join(', ')}"
+
+# You can also look up resources with a specific permission
+# For example, find all posts that emilia can write
+write_request = Authzed::Api::V1::LookupResourcesRequest.new(
+  resource_object_type: 'blog/post',
+  permission: 'write',
+  subject: emilia,
+  consistency: Authzed::Api::V1::Consistency.new(
+    fully_consistent: true
+  )
+)
+
+writable_resources = []
+
+puts "\nLooking up resources that emilia can write..."
+
+client.permissions_service.lookup_resources(write_request) do |response|
+  resource_id = response.resource_object_id
+  writable_resources << resource_id
+  puts "Found writable resource: #{resource_id}"
+end
+
+puts "\nTotal writable resources found: #{writable_resources.length}"
+puts "Writable resource IDs: #{writable_resources.join(', ')}"