feat(lexicon): add note and key-details

Signed-off-by: Maxence Lange <maxence@artificial-owl.com>

core/Command/Base.php

@@ -170,6 +170,8 @@ class Base extends Command implements CompletionAwareInterface {
 			return 'true';
 		} elseif ($value === null) {
 			return $returnNull ? null : 'null';
+		} if ($value instanceof \UnitEnum) {
+			return $value->value;
 		} else {
 			return $value;
 		}

core/Command/Config/App/GetConfig.php

@@ -37,6 +37,12 @@ class GetConfig extends Base {
 				InputOption::VALUE_NONE,
 				'returns complete details about the app config value'
 			)
+			->addOption(
+				'--key-details',
+				null,
+				InputOption::VALUE_NONE,
+				'returns complete details about the app config key'
+			)
 			->addOption(
 				'default-value',
 				null,
@@ -66,6 +72,12 @@ class GetConfig extends Base {
 			return 0;
 		}
 
+		if ($input->getOption('key-details')) {
+			$details = $this->appConfig->getKeyDetails($appName, $configName);
+			$this->writeArrayInOutputFormat($input, $output, $details);
+			return 0;
+		}
+
 		try {
 			$configValue = $this->appConfig->getDetails($appName, $configName)['value'];
 		} catch (AppConfigUnknownKeyException $e) {

core/Command/Config/App/SetConfig.php

@@ -199,6 +199,11 @@ class SetConfig extends Base {
 					$current['lazy'] ? 'lazy cache' : 'fast cache'
 				)
 			);
+			$keyDetails = $this->appConfig->getKeyDetails($appName, $configName);
+			if (($keyDetails['note'] ?? '') !== '') {
+				$output->writeln('<comment>Note:</comment> ' . $keyDetails['note']);
+			}
+
 		} else {
 			$output->writeln('<info>Config value were not updated</info>');
 		}

lib/private/AppConfig.php

@@ -17,6 +17,7 @@ use OCP\Config\Lexicon\Entry;
 use OCP\Config\Lexicon\ILexicon;
 use OCP\Config\Lexicon\Preset;
 use OCP\Config\Lexicon\Strictness;
+use OCP\Config\ValueType;
 use OCP\DB\Exception as DBException;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\Exceptions\AppConfigIncorrectTypeException;
@@ -1094,6 +1095,49 @@ class AppConfig implements IAppConfig {
 		];
 	}
 
+	/**
+	 * @inheritDoc
+	 *
+	 * @param string $app id of the app
+	 * @param string $key config key
+	 *
+	 * @return array{app: string, key: string, lazy?: bool, valueType?: ValueType, valueTypeName?: string, sensitive?: bool, default?: string, definition?: string, note?: string}
+	 * @since 32.0.0
+	 */
+	public function getKeyDetails(string $app, string $key): array {
+		$this->assertParams($app, $key);
+		try {
+			$details = $this->getDetails($app, $key);
+		} catch (AppConfigUnknownKeyException $e) {
+			$details = [
+				'app' => $app,
+				'key' => $key
+			];
+		}
+
+		/** @var Entry $lexiconEntry */
+		try {
+			$lazy = false;
+			$this->matchAndApplyLexiconDefinition($app, $key, $lazy, lexiconEntry: $lexiconEntry);
+		} catch (AppConfigTypeConflictException|AppConfigUnknownKeyException) {
+			// can be ignored
+		}
+
+		if ($lexiconEntry !== null) {
+			$details = array_merge($details, [
+				'lazy' => $lexiconEntry->isLazy(),
+				'valueType' => $lexiconEntry->getValueType(),
+				'valueTypeName' => $lexiconEntry->getValueType()->name,
+				'sensitive' => $lexiconEntry->isFlagged(self::FLAG_SENSITIVE),
+				'default' => $lexiconEntry->getDefault($this->getLexiconPreset()),
+				'definition' => $lexiconEntry->getDefinition(),
+				'note' => $lexiconEntry->getNote(),
+			]);
+		}
+
+		return array_filter($details);
+	}
+
 	/**
 	 * @param string $type
 	 *
@@ -1631,6 +1675,7 @@ class AppConfig implements IAppConfig {
 		?bool &$lazy = null,
 		int &$type = self::VALUE_MIXED,
 		?string &$default = null,
+		?Entry &$lexiconEntry = null,
 	): bool {
 		if (in_array($key,
 			[
@@ -1655,27 +1700,27 @@ class AppConfig implements IAppConfig {
 			return true;
 		}
 
-		/** @var Entry $configValue */
+		/** @var Entry $lexiconEntry */
-		$configValue = $configDetails['entries'][$key];
+		$lexiconEntry = $configDetails['entries'][$key];
 		$type &= ~self::VALUE_SENSITIVE;
 
-		$appConfigValueType = $configValue->getValueType()->toAppConfigFlag();
+		$appConfigValueType = $lexiconEntry->getValueType()->toAppConfigFlag();
 		if ($type === self::VALUE_MIXED) {
 			$type = $appConfigValueType; // we overwrite if value was requested as mixed
 		} elseif ($appConfigValueType !== $type) {
 			throw new AppConfigTypeConflictException('The app config key ' . $app . '/' . $key . ' is typed incorrectly in relation to the config lexicon');
 		}
 
-		$lazy = $configValue->isLazy();
+		$lazy = $lexiconEntry->isLazy();
 		// only look for default if needed, default from Lexicon got priority
 		if ($default !== null) {
-			$default = $configValue->getDefault($this->getLexiconPreset()) ?? $default;
+			$default = $lexiconEntry->getDefault($this->getLexiconPreset()) ?? $default;
 		}
 
-		if ($configValue->isFlagged(self::FLAG_SENSITIVE)) {
+		if ($lexiconEntry->isFlagged(self::FLAG_SENSITIVE)) {
 			$type |= self::VALUE_SENSITIVE;
 		}
-		if ($configValue->isDeprecated()) {
+		if ($lexiconEntry->isDeprecated()) {
 			$this->logger->notice('App config key ' . $app . '/' . $key . ' is set as deprecated.');
 		}
 

lib/public/Config/Lexicon/Entry.php

@@ -23,16 +23,20 @@ class Entry {
 	public const RENAME_INVERT_BOOLEAN = 1;
 
 	private string $definition = '';
+	private string $note = '';
 	private ?string $default = null;
 
 	/**
-	 * @param string $key config key, can only contain alphanumerical chars and -._
+	 * @param string $key config key; can only contain alphanumerical chars and underscore "_"
 	 * @param ValueType $type type of config value
+	 * @param string|int|float|bool|array|Closure|null $defaultRaw default value to be used in case none known
 	 * @param string $definition optional description of config key available when using occ command
 	 * @param bool $lazy set config value as lazy
 	 * @param int $flags set flags
-	 * @param string|null $rename previous config key to migrate config value from
 	 * @param bool $deprecated set config key as deprecated
+	 * @param string|null $rename source in case of a rename of a config key.
+	 * @param int $options additional bitflag options {@see self::RENAME_INVERT_BOOLEAN}
+	 * @param string $note additional note and warning related to the use of the config key.
 	 *
 	 * @since 32.0.0
 	 * @psalm-suppress PossiblyInvalidCast
@@ -48,6 +52,7 @@ class Entry {
 		private readonly bool $deprecated = false,
 		private readonly ?string $rename = null,
 		private readonly int $options = 0,
+		string $note = '',
 	) {
 		// key can only contain alphanumeric chars and underscore "_"
 		if (preg_match('/[^[:alnum:]_]/', $key)) {
@@ -57,6 +62,7 @@ class Entry {
 		/** @psalm-suppress UndefinedClass */
 		if (\OC::$CLI) { // only store definition if ran from CLI
 			$this->definition = $definition;
+			$this->note = $note;
 		}
 	}
 
@@ -187,6 +193,16 @@ class Entry {
 		return $this->definition;
 	}
 
+	/**
+	 * returns eventual note
+	 *
+	 * @return string
+	 * @since 32.0.0
+	 */
+	public function getNote(): string {
+		return $this->note;
+	}
+
 	/**
 	 * returns if config key is set as lazy
 	 *

lib/public/IAppConfig.php

@@ -8,6 +8,7 @@ declare(strict_types=1);
  */
 namespace OCP;
 
+use OCP\Config\ValueType;
 use OCP\Exceptions\AppConfigUnknownKeyException;
 
 /**
@@ -449,6 +450,33 @@ interface IAppConfig {
 	 */
 	public function getDetails(string $app, string $key): array;
 
+	/**
+	 * returns an array containing details about a config key.
+	 * key/value pair are available only if it exists.
+	 *
+	 * ```
+	 * [
+	 *   "app" => "myapp",
+	 *   "key" => "mykey",
+	 *   "value" => "current_value",
+	 *   "default" => "default_if_available",
+	 *   "definition" => "this is what it does",
+	 *   "note" => "enabling this is not compatible with that",
+	 *   "lazy" => false,
+	 *   "type" => 4,
+	 *   "typeString" => "string",
+	 *   'sensitive' => false
+	 * ]
+	 * ```
+	 *
+	 * @param string $app id of the app
+	 * @param string $key config key
+	 *
+	 * @return array{app: string, key: string, lazy?: bool, valueType?: ValueType, valueTypeName?: string, sensitive?: bool, default?: string, definition?: string, note?: string}
+	 * @since 32.0.0
+	 */
+	public function getKeyDetails(string $app, string $key): array;
+
 	/**
 	 * Convert string like 'string', 'integer', 'float', 'bool' or 'array' to
 	 * to bitflag {@see VALUE_STRING}, {@see VALUE_INT}, {@see VALUE_FLOAT},