[Proposal/Exploration] Expose generating JSON Schema that matches the config schema for decoupled admin UIs (#3324982) · Issues · project / jsonapi_schema

[Proposal/Exploration] Expose generating JSON Schema that matches the config schema for decoupled admin UIs

>>> [!note] Migrated issue   Reported by: [wim leers](https://www.drupal.org/user/99777) >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> As I was working on various issues to make the config schema for <code>field_storage_config</code> be exposed via this wonderful module (see <a href="https://git.drupalcode.org/project/jsonapi_schema/-/work_items/3324769" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/jsonapi_schema/-/work_items/3324769</a> + <a href="https://git.drupalcode.org/project/jsonapi_schema/-/work_items/3324824" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/jsonapi_schema/-/work_items/3324824</a>), specifically for <a href="https://www.drupal.org/project/field_ui_modern">https://www.drupal.org/project/field_ui_modern</a>, I discovered/realized that there is a lot left to be explored WRT JSON Schema and specifically the validation aspects of it, which are covered by <a href="https://datatracker.ietf.org/doc/html/draft-bhutton-json-schema-validation-01">https://datatracker.ietf.org/doc/html/draft-bhutton-json-schema-validation-01</a>. This module already exposes things like <code>required</code>, but rarely more than that. Ideally, we should be able to automatically transform both content entity validation constraints and config schema types + validation constraints (see <a href="https://www.drupal.org/project/drupal/issues/2164373" title="Status: Closed (fixed)">#2164373: [META] Untie config validation from form validation — enables validatable Recipes, decoupled admin UIs …</a>). Relates issues but with a narrower scope: <a href="https://git.drupalcode.org/project/jsonapi_schema/-/work_items/3058852" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/jsonapi_schema/-/work_items/3058852</a>, <a href="https://git.drupalcode.org/project/jsonapi_schema/-/work_items/3174991" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/jsonapi_schema/-/work_items/3174991</a> and <a href="https://git.drupalcode.org/project/jsonapi_schema/-/work_items/3258702" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/jsonapi_schema/-/work_items/3258702</a> P.S.: I thought <a href="https://modern-json-schema.com/json-schema-is-a-constraint-system">https://modern-json-schema.com/json-schema-is-a-constraint-system</a> was a particularly good high-level introduction. <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <h3 id="summary-proposed-resolution">Proposed resolution</h3> Generate a far richer schema, somewhat like this — note the use of: <ol> <li><code>uniqueItems</code></li> <li><code>exclusiveMinimum</code></li> <li><code>required</code></li> <li><code>enum</code></li> <li><code>$drupalUiHint</code> → Drupal-specific addition!</li> <li><code>$drupalPluginIdOfType</code> → Drupal-specific addition!</li> </ol> <pre>{   "$schema": "https://json-schema.org/draft/2019-09/hyper-schema",   "$id": "/jsonapi/field_storage_config/field_storage_config/resource/schema",   "title": "Field storage",   "allOf": [     {       "type": "object",       "properties": {         "type": {           "$ref": "#/definitions/type"         },         "attributes": {           "$ref": "#/definitions/attributes"         }       }     },     {       "$ref": "https://jsonapi.org/schema#/definitions/resource"     }   ],   "definitions": {     "type": {       "const": "field_storage_config--field_storage_config"     },     "attributes": {       "type": "object",       "description": "Entity attributes",       "required": [         "entity_type",         "field_name",         "field_storage_config_type"       ],       "properties": {         "uuid": {           "type": "string",           "title": "UUID",           "format": "uuid",           "maxLength": 128,           "$drupalUiHint": "no-ui"         },         "drupal_internal__id": {           "type": "string",           "title": "drupal_internal__id",           "pattern": "^(node|media|taxonomy_term|user)\\.[_a-z]+[_a-z0-9]*$",           "$comment": "The ID consists of 2 parts: the entity type and the field name."         },         "field_name": {           "type": "string",           "title": "Field name",           "pattern": "^[_a-z]+[_a-z0-9]*$",           "description": "The name of the field."         },         "entity_type": {           "type": "string",           "title": "Entity Type",           "enum": [             "node",             "media",             "taxonomy_term",             "user"           ],           "$drupalPluginIdOfType": "content_entity_type",           "$drupalUiHint": "dropdown"         },         "field_storage_config_type": {           "type": "string",           "title": "Field type",           "$comment": "Tricky: This is only not called 'type' because that is a reserved keyword in JSON:API.",           "description": "Choose a field type.",           "enum": [             "uuid",             "boolean",             "decimal",             "email",             "entity_reference",             "float",             "integer",             "string",             "string_long",             "timestamp",             "comment",             "datetime",             "daterange"           ],           "$drupalPluginIdOfType": "field_type",           "$drupalUiHint": "dropdown"         },         "langcode": {           "type": "string",           "title": "Language",           "enum": ["en"],           "default": "en",           "$drupalUiHint": "no-ui"         },         "status": {           "type": "boolean",           "title": "Status",           "default": true         },         "dependencies": {           "type": "object",           "title": "Dependencies",           "$drupalUiHint": "no-ui",           "additionalProperties": false,           "properties": {             "config": {               "type": "array",               "uniqueItems": true,               "title": "Configuration dependencies",               "items": {                 "type": "string",                 "title": "Configuration dependency"               }             },             "content": {               "type": "array",               "uniqueItems": true,               "title": "Content dependencies",               "items": {                 "type": "string",                 "title": "Content dependency"               }             },             "module": {               "type": "array",               "uniqueItems": true,               "title": "Module dependencies",               "items": {                 "type": "string",                 "title": "Module dependency"               }             },             "theme": {               "type": "array",               "uniqueItems": true,               "title": "Theme dependencies",               "items": {                 "type": "string",                 "title": "Theme dependency"               }             }           },           "enforced": {             "type": "object",             "title": "Enforced dependencies",             "additionalProperties": false,             "properties": {               "config": {                 "type": "array",                 "uniqueItems": true,                 "title": "Configuration dependencies",                 "items": {                   "type": "string",                   "title": "Configuration dependency"                 }               },               "content": {                 "type": "array",                 "uniqueItems": true,                 "title": "Content dependencies",                 "items": {                   "type": "string",                   "title": "Content dependency"                 }               },               "module": {                 "type": "array",                 "uniqueItems": true,                 "title": "Module dependencies",                 "items": {                   "type": "string",                   "title": "Module dependency"                 }               },               "theme": {                 "type": "array",                 "uniqueItems": true,                 "title": "Theme dependencies",                 "items": {                   "type": "string",                   "title": "Theme dependency"                 }               }             }           }         },         "third_party_settings": {           "type": "array",           "items": {             "properties": {               "third_party_settings": {                 "title": "third_party_settings"               }             }           }         },         "locked": {           "type": "boolean",           "title": "Locked",           "description": "Whether the field storage is locked or not. When locked, field settings cannot be changed, no new fields can be created using this storage, and existing fields using this storage cannot be deleted.",           "default": false,           "$drupalUiHint": "no-ui-when-creating"         },         "cardinality": {           "type": "integer",           "title": "Cardinality",           "description": "Allowed number of values",           "exclusiveMinimum": 1,           "default": 1         },         "translatable": {           "type": "boolean",           "title": "Translatable",           "default": true         },         "indexes": {           "type": "array",           "$drupalUiHint": "no-ui",           "items": {             "properties": {               "indexes": {                 "title": "indexes"               }             }           }         },         "persist_with_no_fields": {           "type": "boolean",           "title": "Whether the field storage should be persisted when orphaned",           "default": false,           "$drupalUiHint": "no-ui"         },         "custom_storage": {           "type": "boolean",           "title": "custom_storage",           "default": false,           "$drupalUiHint": "no-ui"         }       },       "additionalProperties": false     }   } }</pre><h3 id="summary-remaining-tasks">Remaining tasks</h3> TBD <h3 id="summary-ui-changes">User interface changes</h3> TBD <h3 id="summary-api-changes">API changes</h3> TBD <h3 id="summary-data-model-changes">Data model changes</h3> TBD > Related issue: [Issue #2164373](https://www.drupal.org/node/2164373)

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