Issue #3324140: Convert field_storage_config and field_config's form validation logic to validation constraints

core/config/schema/core.data_types.schema.yml

@@ -533,16 +533,29 @@ base_entity_reference_field_settings:
 
 field_config_base:
   type: config_entity
+  constraints:
+    UniqueFieldCombination: [entity_type, bundle, field_name]
   mapping:
     id:
       type: string
       label: 'ID'
+      constraints:
+        StringParts:
+          separator: .
+          parts:
+            - '%parent.entity_type'
+            - '%parent.bundle'
+            - '%parent.field_name'
     field_name:
       type: string
       label: 'Field name'
     entity_type:
       type: string
       label: 'Entity type'
+      constraints:
+        PluginExists:
+          manager: entity_type.manager
+          interface: \Drupal\Core\Entity\FieldableEntityInterface
     bundle:
       type: string
       label: 'Bundle'
@@ -554,6 +567,7 @@ field_config_base:
     description:
       type: text
       label: 'Help text'
+      nullable: true
     required:
       type: boolean
       label: 'Required field'
@@ -563,14 +577,29 @@ field_config_base:
     default_value:
       type: sequence
       label: 'Default values'
+      nullable: true
       sequence:
         type: field.value.[%parent.%parent.field_type]
         label: 'Default value'
+        constraint:
+          # TBD, looks like \Symfony\Component\Validator\Constraints\ValidValidator *could* work here…
+          Valid: []
     default_value_callback:
       type: string
       label: 'Default value callback'
+      nullable: true
+      constraints:
+        Type:
+          type:
+            - 'callable'
+            - 'string'
+            - 'null'
     settings:
       type: field.field_settings.[%parent.field_type]
+      # @todo Constraints on each of the field type-specific settings config
+      # schemas BUT extra special challenge: until Drupal 11, at best only
+      # core field types will have validation constraints set! Remove this
+      # todo in https://drupal.org/i/3512957
     field_type:
       type: string
       label: 'Field type'
@@ -582,6 +611,8 @@ field_config_base:
 core.base_field_override.*.*.*:
   type: field_config_base
   label: 'Base field bundle override'
+  constraints:
+    FullyValidatable: ~
 
 core.date_format.*:
   type: config_entity
@@ -666,6 +697,12 @@ field.storage_settings.string:
       type: boolean
       label: 'Contains US ASCII characters only'
 
+field.field_settings.string:
+  type: mapping
+  label: 'String settings'
+  constraints:
+    FullyValidatable: ~
+
 field.value.string:
   type: mapping
   label: 'Default value'
@@ -683,6 +720,14 @@ field.storage_settings.string_long:
     case_sensitive:
       type: boolean
       label: 'Case sensitive'
+  constraints:
+    FullyValidatable: ~
+
+field.field_settings.string_long:
+  type: mapping
+  label: 'String (long) settings'
+  constraints:
+    FullyValidatable: ~
 
 field.value.string_long:
   type: mapping
@@ -698,6 +743,14 @@ field.value.string_long:
 field.storage_settings.password:
   type: field.storage_settings.string
   label: 'Password settings'
+  constraints:
+    FullyValidatable: ~
+
+field.field_settings.password:
+  type: mapping
+  label: 'Password settings'
+  constraints:
+    FullyValidatable: ~
 
 # Schema for the configuration of the URI field type.
 # This field type has no field instance settings, so no specific config schema type.
@@ -713,6 +766,12 @@ field.storage_settings.uri:
       type: boolean
       label: 'Case sensitive'
 
+field.field_settings.uri:
+  type: mapping
+  label: 'URI settings'
+  constraints:
+    FullyValidatable: ~
+
 field.value.uri:
   type: mapping
   label: 'Default value'
@@ -722,10 +781,19 @@ field.value.uri:
       label: 'Value'
 
 # Schema for the configuration of the Created field type.
-# This field type has no field storage settings, so no specific config schema type.
-# @see `type: field.storage_settings.*`
-# This field type has no field instance settings, so no specific config schema type.
-# @see `type: field.field_settings.*`
+
+field.storage_settings.created:
+  type: mapping
+  label: 'Created timestamp settings'
+  constraints:
+    FullyValidatable: ~
+
+field.field_settings.created:
+  type: mapping
+  label: 'Created timestamp settings'
+  constraints:
+    FullyValidatable: ~
+
 field.value.created:
   type: mapping
   label: 'Default value'
@@ -735,10 +803,19 @@ field.value.created:
       label: 'Value'
 
 # Schema for the configuration of the Changed field type.
-# This field type has no field storage settings, so no specific config schema type.
-# @see `type: field.storage_settings.*`
-# This field type has no field instance settings, so no specific config schema type.
-# @see `type: field.field_settings.*`
+
+field.storage_settings.changed:
+  type: mapping
+  label: 'Changed timestamp settings'
+  constraints:
+    FullyValidatable: ~
+
+field.field_settings.changed:
+  type: mapping
+  label: 'Changed timestamp settings'
+  constraints:
+    FullyValidatable: ~
+
 field.value.changed:
   type: mapping
   label: 'Default value'
@@ -756,6 +833,9 @@ field.storage_settings.entity_reference:
     target_type:
       type: string
       label: 'Type of item to reference'
+      constraints:
+        PluginExists:
+          manager: entity_type.manager
 
 field.field_settings.entity_reference:
   type: mapping
@@ -797,6 +877,8 @@ field.field_settings.boolean:
     off_label:
       type: required_label
       label: 'Off label'
+  constraints:
+    FullyValidatable: ~
 
 field.value.boolean:
   type: mapping
@@ -806,8 +888,13 @@ field.value.boolean:
       label: 'Value'
 
 # Schema for the configuration of the Email field type.
-# This field type has no field storage settings, so no specific config schema type.
-# @see `type: field.storage_settings.*`
+
+field.storage_settings.email:
+  type: mapping
+  label: 'Email settings'
+  constraints:
+    FullyValidatable: ~
+
 field.field_settings.email:
   type: mapping
   label: 'Email settings'
@@ -904,6 +991,8 @@ field.value.decimal:
 field.storage_settings.float:
   type: mapping
   label: 'Float settings'
+  constraints:
+    FullyValidatable: ~
 
 field.field_settings.float:
   type: mapping