Include information about additionalProperties in object tables (#1798)

Currently, if we have an object which has additionalProperties in addition to properties, that information gets lost. This PR seeks to address that.

changelogs/internal/newsfragments/1798.clarification

@@ -0,0 +1 @@
+Show information about "Additional Properties" in object tables.

data/api/identity/v2_terms.yaml

@@ -52,7 +52,6 @@ paths:
                             might be and could be "alpha", semantically versioned, or arbitrary.
                       required:
                         - version
-                      # TODO: TravisR - Make this render
                       additionalProperties:
                         type: object
                         title: Internationalised Policy

layouts/partials/json-schema/resolve-additional-types.html

@@ -29,6 +29,8 @@
  *
  *     * title
  *     * properties
+ *     * additionalProperties
+ *     * patternProperties
  *     * required
  *     * enum
  *     * anchor
@@ -45,27 +47,31 @@
     "schema" .schema
     "anchor_base" .anchor_base
     "name" (.name | default .schema.title | default "<untitled object>")
+    "top_level" true
 ) }}
 {{ return $res.objects }}
 
 /*
  * A helper for the resolve-additional-types partial.
  *
- * Takes the same inputs as resolve-additional-types itself, except that `name` is mandatory.
+ * Takes the same inputs as resolve-additional-types itself, except:
+ *   * `name` is mandatory.
+ *   * `top_level`, if set, indicates that this is the top-level object.
  *
  * Returns a dict containing:
  *
  *   * `objects`: The array of object schema definitions.
  *
- *   * `schema`: An updated copy of the `schema` input (eg, nested `allOf`
- *     entries are expanded, and an `anchor` may be added). If the input
- *     `schema` was itself an object, this will be the same as the first entry
- *     in `objects`.
+ *   * `schema`: An updated copy of the `schema` input (eg, an `anchor` may be added).
+ *     If the input `schema` was itself an object that we should create a table for,
+ *     this will be the same as the first entry in `objects`.
  */
 {{ define "partials/resolve-additional-types-inner" }}
     {{ $this_object := .schema }}
     {{ $anchor_base := .anchor_base }}
     {{ $name := .name }}
+    {{ $top_level := .top_level }}
+
     {{ $all_objects := slice }}
 
     {{ if eq $this_object.type "object" }}
@@ -126,13 +132,25 @@
             {{ $this_object = merge $this_object (dict "properties" $updated_properties) }}
         {{ end }}
 
-        /* Finally, prepend the updated schema for the top-level object onto the $all_objects array */
+        /* We'll want to create a table for `$this_object` itself if either:
+         *
+         *  - The object has some regular properties (not just patternProperties or additionalProperties), or:
+         *  - It is the top-level object. (We use a special format of table for top-level objects that
+         *    only have patternProperties or additionalProperties)
+         *
+         * In those cases, prepend the updated schema for the top-level object onto the $all_objects array.
+         *
+         * We think about this last so that we can take advantage of any updates to the schema that happened
+         * above (in particular, addition of `anchor` attributes).
+         */
+        {{ if or $this_object.properties $top_level }}
             {{ $tmp := slice $this_object }}
             {{ if $all_objects }}
                 {{ $tmp = $tmp | append $all_objects }}
             {{ end }}
             {{ $all_objects = $tmp }}
         {{ end }}
+    {{ end }}
 
     {{ if eq $this_object.type "array" }}
         /* Add any nested objects referenced in this object's `items` */
@@ -198,8 +216,7 @@
  *
  * Returns a dict containing:
  *   * `objects`: The array of object schema definitions.
- *   * `schema`: An updated copy of the `schema` input (eg, nested `allOf`
- *     entries are expanded, and an `anchor` may be added).
+ *   * `schema`: An updated copy of the `schema` input (eg, an `anchor` may be added).
  */
 {{ define "partials/get-additional-objects" }}
     /* .name is the name of the object for logging purposes */
@@ -211,7 +228,7 @@
       {{ errorf "Invalid call to partials/get-additional-objects: %s is not a map" $name .this_object }}
     {{ end }}
 
-    {{ $res := partial "resolve-additional-types-inner" (dict "schema" .this_object "anchor_base" .anchor_base "name" $name) }}
+    {{ $res := partial "resolve-additional-types-inner" (dict "schema" .this_object "anchor_base" .anchor_base "name" $name "top_level" false) }}
     {{ range $res.objects }}
         {{ $all_objects = $all_objects | append (partial "clean-object" .) }}
     {{ end }}
@@ -226,5 +243,5 @@
  * but with (for example) different examples will be considered different.
  */
 {{ define "partials/clean-object" }}
-    {{ return (dict "title" .title "properties" .properties "required" .required "enum" .enum "anchor" .anchor) }}
+    {{ return (dict "title" .title "properties" .properties "additionalProperties" .additionalProperties "patternProperties" .patternProperties "required" .required "enum" .enum "anchor" .anchor) }}
 {{ end }}

layouts/partials/openapi/render-object-table.html

@@ -9,11 +9,11 @@
   * `properties`: optional dictionary of the properties to list, each given as:
     `property_name` : `property_data`
 
-  * `additionalProperties`: optional dictionary for properties with undefined
-    names, in the same format as `property_data`
+  * `additionalProperties`: a JSON Schema for additional properties on the
+    object.
 
   * `patternProperties`: optional dictionary for properties with names adhering
-    to a regex pattern, in the same format as `property_data`
+    to a regex pattern. A map from regex pattern to JSON Schema.
 
   * `required`: optional array containing the names of required properties.
     In some cases (such as response body specifications) this isn't used, and
@@ -26,7 +26,6 @@
 {{ $required := .required}}
 
 {{ if $properties }}
-
 <table{{ if .anchor }} id="{{ .anchor }}"{{ end }} class="object-table">
  {{ with $title }}
  <caption>{{ . }}</caption>
@@ -52,9 +51,40 @@
 
     {{ end }}
 
+    {{/*
+      If the object has additional properties *as well as* regular properties, we add a special row to the table.
+
+      Note that, per https://json-schema.org/draft/2020-12/json-schema-core#name-boolean-json-schemas, JSON schemas
+      can be a simple "true" or "false" as well as the more normal object.
+
+      `additionalProperties: true` is pretty much the default for Matrix (it means: "you're allowed to include random
+      unspecced properties in your object"), so nothing to do here.
+
+      `additionalProperties: false` means "you're not allowed to include any unspecced properties in your object". We
+      may want to consider how to display that; for now we just ignore it.
+
+      TODO: support `patternProperties` here.
+    */}}
+    {{ if reflect.IsMap .additionalProperties }}
+
+ <tr>
+  <td>&lt;Other properties&gt;</code></td>
+  <td><code>{{ partial "partials/property-type" .additionalProperties | safeHTML }}</code></td>
+  <td>{{ partial "partials/property-description" (dict "property" .additionalProperties) }}</td>
+ </tr>
+    {{ end }}
 </table>
 
 {{ else if (or .additionalProperties .patternProperties) }}
+
+{{/*
+A special format of table for objects which only have additionalProperties or patternProperties.
+
+This is only ever used for top-level objects. Nested objects in this situation are just shown
+as rows within their parent object, and don't get their own table. (They are filtered out in
+resolve-additional-types.)
+*/}}
+
 <table{{ if .anchor }} id="{{ .anchor }}"{{ end }} class="object-table">
  {{ with $title }}
  <caption>{{ . }}</caption>