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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Rest; |
| 4 | |
| 5 | use Wikimedia\Message\MessageValue; |
| 6 | |
| 7 | /** |
| 8 | * Utility class for json localization needs in the REST API. |
| 9 | * |
| 10 | * Much of this involves replacing custom name/value pairs (herein referred to as i18n pairs) with |
| 11 | * translated standard name/value pairs (herein referred to as schema pairs). For example, OpenAPI |
| 12 | * specifications include a "description" field represented as a name/value pair, like: |
| 13 | * "description": "My description". |
| 14 | * We allow a "x-i18n-description" field, whose value is a MediaWiki message key, like: |
| 15 | * "x-i18n-description": "rest-my-description-message-key" |
| 16 | * Functions in this class will replace the "x-i18n-description" with a translated "description". |
| 17 | */ |
| 18 | class JsonLocalizer { |
| 19 | private ResponseFactory $responseFactory; |
| 20 | |
| 21 | private const LOCALIZATION_PREFIX = 'x-i18n-'; |
| 22 | |
| 23 | /** |
| 24 | * @param ResponseFactory $responseFactory |
| 25 | * |
| 26 | * @internal |
| 27 | */ |
| 28 | public function __construct( |
| 29 | ResponseFactory $responseFactory |
| 30 | ) { |
| 31 | $this->responseFactory = $responseFactory; |
| 32 | } |
| 33 | |
| 34 | /** |
| 35 | * Recursively localizes name/value pairs, where the name begins with "x-i18-n-" |
| 36 | * |
| 37 | * @param array $json the input json, as a PHP array |
| 38 | * |
| 39 | * @return array the adjusted json, or the unchanged json if no adjustments were made |
| 40 | */ |
| 41 | public function localizeJson( array $json ): array { |
| 42 | return $this->localizeJsonPairs( $json, self::LOCALIZATION_PREFIX ); |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * Recursively localizes name/value pairs. Pairs to be localized are identified by prefix, |
| 47 | * and values must be message keys. |
| 48 | * |
| 49 | * The resulting key has the prefix removed, and a localized value. For example this pair: |
| 50 | * 'x-i18n-description' => 'mw-rest-my-description-message-key' |
| 51 | * Would be localized to something like: |
| 52 | * 'description' => 'My Description' |
| 53 | * |
| 54 | * @param array $json the input json, as a PHP array |
| 55 | * @param string $i18nPrefix keys beginning with this prefix will be localized |
| 56 | * |
| 57 | * @return array the adjusted json, or the unchanged json if no adjustments were made |
| 58 | */ |
| 59 | private function localizeJsonPairs( array $json, string $i18nPrefix ): array { |
| 60 | // Use a reference for $value, because it is potentially modified within the loop. |
| 61 | foreach ( $json as $key => &$value ) { |
| 62 | if ( is_array( $value ) ) { |
| 63 | $value = $this->localizeJsonPairs( $value, $i18nPrefix ); |
| 64 | } elseif ( str_starts_with( $key, $i18nPrefix ) ) { |
| 65 | $newKey = substr( $key, strlen( $i18nPrefix ) ); |
| 66 | |
| 67 | // Add the description to the top of the json, for visibility in raw specs |
| 68 | $msg = new MessageValue( $value ); |
| 69 | $pair = [ $newKey => $msg ]; |
| 70 | $json = $pair + $json; |
| 71 | $json[$newKey] = $this->getFormattedMessage( $msg ); |
| 72 | |
| 73 | unset( $json[$key] ); |
| 74 | } |
| 75 | } |
| 76 | return $json; |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Returns the localized value if possible, or the non-localized value if one is |
| 81 | * available, or null otherwise. Translates only top-level keys. Useful when the value |
| 82 | * corresponding to the input key may be either a string to be used as-is or a MessageValue |
| 83 | * object to be localized. |
| 84 | * |
| 85 | * @param array $json the input json, as a PHP array |
| 86 | * @param string $key key name of the field |
| 87 | * |
| 88 | * @return ?string |
| 89 | */ |
| 90 | public function localizeValue( array $json, string $key ): ?string { |
| 91 | $value = null; |
| 92 | |
| 93 | if ( array_key_exists( $key, $json ) ) { |
| 94 | if ( $json[ $key ] instanceof MessageValue ) { |
| 95 | $value = $this->getFormattedMessage( $json[ $key ] ); |
| 96 | } else { |
| 97 | $value = $json[ $key ]; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | return $value; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Tries to return one formatted string for a message key or message value object. |
| 106 | * |
| 107 | * @param string|MessageValue $message the message format, or a key representing it |
| 108 | * |
| 109 | * @return string |
| 110 | */ |
| 111 | public function getFormattedMessage( $message ): string { |
| 112 | if ( !$message instanceof MessageValue ) { |
| 113 | $message = new MessageValue( $message ); |
| 114 | } |
| 115 | |
| 116 | // TODO: consider if we want to request a specific preferred language |
| 117 | return $this->responseFactory->getFormattedMessage( $message ); |
| 118 | } |
| 119 | |
| 120 | } |