Missing documentation on authorization (#237)

* Add clarification around types for relationship properties

* Add clarification on reduced filtering of subscriptions

* Add missing sections of operations

* Add missing authorization documentation

* yarn lock

* Apply suggestions from code review

Co-authored-by: Richard Sill <156673635+rsill-neo4j@users.noreply.github.com>

* Update modules/ROOT/pages/security/authorization.adoc

Co-authored-by: Richard Sill <156673635+rsill-neo4j@users.noreply.github.com>

* Address review comments

---------

Co-authored-by: Richard Sill <156673635+rsill-neo4j@users.noreply.github.com>

Author: darrellwarde

modules/ROOT/pages/security/authorization.adoc

@@ -56,7 +56,7 @@ For instance, to only require filtering for the reading and aggregating posts:
 [source, graphql, indent=0]
 ----
 type Post @authorization(filter: [
-    { operations: [READ, AGGREGATE] where: { node: { author: { id: "$jwt.sub" } } } }
+    { operations: [READ, AGGREGATE], where: { node: { author: { id: "$jwt.sub" } } } }
 ]) {
     title: String!
     content: String!
@@ -106,11 +106,10 @@ Validation can be configured to only be performed on certain operations:
 
 For instance, to only require validation for the update or deletion of a post:
 
-
 [source, graphql, indent=0]
 ----
 type Post @authorization(validate: [
-    { operations: [UPDATE, DELETE] where: { node: { author: { id: "$jwt.sub" } } } }
+    { operations: [UPDATE, DELETE], where: { node: { author: { id: "$jwt.sub" } } } }
 ]) {
     title: String!
     content: String!
@@ -123,6 +122,98 @@ type Post @authorization(validate: [
 In case there is no `operations` argument with a list of operations, the GraphQL Library treats the authorization configuration as if the full list of operations had been provided.
 ====
 
+=== When
+
+Validation can be configured to only be performed before or after an operation is executed. 
+This is done using the `when` argument which accepts an array of the following values:
+
+* `BEFORE`
+* `AFTER`
+
+Additionally, some operations only support validation either before or after them, which is summarised in this table:
+
+[cols="2,5"]
+|===
+| `operation` | `when`
+
+| `READ`
+| `BEFORE`
+
+| `AGGREGATE`
+| `BEFORE`
+
+| `CREATE`
+| `AFTER`
+
+| `UPDATE`
+| `BEFORE`, `AFTER`
+
+| `DELETE`
+| `BEFORE`
+
+| `CREATE_RELATIONSHIP`
+| `BEFORE`, `AFTER`
+
+| `DELETE_RELATIONSHIP`
+| `BEFORE`, `AFTER`
+
+|===
+
+As an example, let's say you want someone to be able to update a post.
+If you want to check that after the update the author of the post is still the current user,  do the following:
+
+[source, graphql, indent=0]
+----
+type Post @authorization(validate: [
+    { operations: [UPDATE], when: [AFTER], where: { node: { author: { id: "$jwt.sub" } } } }
+]) {
+    title: String!
+    content: String!
+    author: User! @relationship(type: "AUTHORED", direction: IN)
+}
+----
+
+== Authorization on fields 
+
+The `@authorization` directive can be used either on object types or their fields, with the former being used in examples for the most part on this page.
+When applied to a field, the authorization rules are only evaluated if the matching operations are performed on that field.
+For example, consider a `User` type with a `password` field:
+
+[source, graphql, indent=0]
+----
+type User {
+    id: ID!
+    username: String!
+    password: String! @authorization(where: [{ operations: [READ, UPDATE], where: { node: { id: "$jwt.sub" } } }])
+}
+----
+
+When executing the following query, a valid identity is not needed:
+
+[source, graphql, indent=0]
+----
+{
+    users {
+        username
+    }
+}
+----
+
+However, consider the following query:
+
+[source, graphql, indent=0]
+----
+{
+    users {
+        username
+        password
+    }
+}
+----
+
+This will require a valid JWT to have been provided with the request, and the matching users will be filtered down according to the JWT subject.
+The same applies for attempting to update the `password` field, the update will only apply to the user matching the JWT.
+
 
 == Authorization without authentication
 
@@ -147,3 +238,33 @@ type Post @authorization(filter: [
     author: User! @relationship(type: "AUTHORED", direction: IN)
 }
 ----
+
+== Ordering of rules
+
+In each ruleset (`filter` and `validate`), rules are joined with an `OR`.
+The two rulesets are joined with an `AND`.
+
+For example, the following would allow for the update of a `User` node if the JWT roles claim includes `admin` _or_ if the `locked` property on the node is `false`:
+
+[source, graphql, indent=0]
+----
+type User @authorization(validate: [
+    { operations: [UPDATE], where: { jwt: { roles_INCLUDES: "admin" } } }
+    { operations: [UPDATE], where: { node: { locked: false } } }
+]) {
+    id: ID!
+    locked: Boolean!
+}
+----
+
+If you want to combine the rule that a user must be an admin with the rule that the `locked` property must be `false` in order to update a `User` node, add them both to the `where` field using `AND` in a single rule:
+
+[source, graphql, indent=0]
+----
+type User @authorization(validate: [
+    { operations: [UPDATE], where: { AND: [{ jwt: { roles_INCLUDES: "admin" } }, { node: { locked: false } }] } }
+]) {
+    id: ID!
+    locked: Boolean!
+}
+----

modules/ROOT/pages/security/operations.adoc

@@ -37,8 +37,66 @@ query {
 }
 ----
 
+=== Connection
+
+For a connection query, rules with `READ` in the operations are evaluated for any type being read:
+
+[source, graphql, indent=0]
+----
+query {
+    moviesConnection {
+        edges {
+            node {                 # READ ON OBJECT Movie
+                title              # READ ON FIELD_DEFINITION Movie.title
+                actorsConnection {
+                    edges {
+                        node {     # READ ON OBJECT Actor
+                            name   # READ ON FIELD_DEFINITION Actor.name
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+----
+
+=== Aggregation
+
+For an aggregation query, rules with `AGGREGATE` in the operations are evaluated for any type being aggregated:
+
+[source, graphql, indent=0]
+----
+query {
+    moviesAggregate { # AGGREGATE ON OBJECT Movie
+        title {       # AGGREGATE ON FIELD_DEFINITION Movie.title
+            longest
+        }
+    }
+}
+----
+
+The same logic applies to aggregations of nested nodes:
+
+[source, graphql, indent=0]
+----
+query {
+    movies {
+        actorsAggregate {   # AGGREGATE ON OBJECT Actor
+            node {
+                name {      # AGGREGATE ON FIELD_DEFINITION Actor.name
+                    longest
+                }
+            }
+        }
+    }
+}
+----
+
 == Mutation
 
+=== Create
+
 For `create` mutations, `CREATE` rules on the object are evaluated for each node created, as well as field definition rules:
 
 [source, graphql, indent=0]
@@ -56,6 +114,8 @@ mutation {
 }
 ----
 
+=== Delete
+
 For single `delete` mutations, rules with `DELETE` on the object are evaluated:
 
 [source, graphql, indent=0]
@@ -81,6 +141,8 @@ mutation {
 }
 ----
 
+=== Update
+
 For a complex `update` mutation with many effects, a variety of rules is evaluated, as well as `READ` rules for the selection set:
 
 [source, graphql, indent=0]

modules/ROOT/pages/security/subscriptions-authorization.adoc

@@ -3,7 +3,8 @@
 = Subscriptions authorization
 
 Subscriptions require their own authorization rules, which are configured with the `@subscriptionsAuthorization` directive.
-These rules are different to authorization rules for queries and mutations because they use filtering rules available for subscriptions events.
+These rules are different to authorization rules for queries and mutations because they use filtering rules available for subscriptions events. 
+These filtering rules can only be used to filter against the properties of the nodes impacted by the events.
 
 All subscriptions authorization rules have an implied requirement for authentication, given that the rules are normally evaluated against values in the JWT payload.
 

modules/ROOT/pages/types/relationships.adoc

@@ -65,6 +65,9 @@ You can add relationship properties to the example in two steps:
 . Add a type definition decorated with the `@relationshipProperties` directive, containing the desired relationship properties.
 . Add a `properties` argument to both "sides" (or just one side, if you prefer) of the `@relationship` directive which points to the newly defined interface.
 
+Relationship properties fields can only be primitive types or their list variants.
+You cannot map complex types such as object types into the types modelling relationship properties. 
+
 For example, suppose you want to distinguish which roles an actor played in a movie:
 
 [source, graphql, indent=0]