現在服務端程序員的主要工作已經不再是套模版,而是編寫基于 JSON 的 API 接口??上Т蠹揖帉懡涌诘娘L格往往迥異,這就給系統集成帶來了很多不必要的溝通成本,如果你有類似的困擾,那么不妨關注一下 JSONAPI ,它是一個基于 JSON 構建 API 的規范標準,一個簡單的 API 接口大致如下所示:
JSONAPI
簡單說明一下:根節點中的 data 用來放置主對象的內容,其中 type 和 id 是必須要有的字段,用來表示主對象的類型和標識,其它簡單的屬性統統放置到 attributes 里,如果主對象存在一對一、一對多等關聯對象,那么放置到 relationships 里,不過只是通過 type 和 id 字段放置一個鏈接,關聯對象的實際內容統統放置在根接點中的 included 里。
有了 JSONAPI,數據解析的過程變得規范起來,節省了不必要的溝通成本。不過如果要手動構建 JSONAPI 數據還是很麻煩的,好在通過使用 Fractal 可以讓實現過程相對自動化一些,上面的例子如果用 Fractal 實現大概是這個樣子:
<?phpuse League/Fractal/Manager;use League/Fractal/Resource/Collection;$articles = [ [ 'id' => 1, 'title' => 'JSON API paints my bikeshed!', 'body' => 'The shortest article. Ever.', 'author' => [ 'id' => 42, 'name' => 'John', ], ],];$manager = new Manager();$resource = new Collection($articles, new ArticleTransformer());$manager->parseIncludes('author');$manager->createData($resource)->toArray();?>
如果讓我選最喜愛的 PHP 工具包,Fractal 一定榜上有名,它隱藏了實現細節,讓使用者完全不必了解 JSONAPI 協議即可上手。不過如果你想在自己的項目里使用的話,與直接使用 Fractal 相比,可以試試 Fractalistic ,它對 Fractal 進行了封裝,使其更好用:
<?phpFractal::create() ->collection($articles) ->transformWith(new ArticleTransformer()) ->includeAuthor() ->toArray();?>
如果你是裸寫 PHP 的話,那么 Fractalistic 基本就是最佳選擇了,不過如果你使用了一些全棧框架的話,那么 Fractalistic 可能還不夠優雅,因為它無法和框架本身已有的功能更完美的融合,以 Lavaral 為例,它本身內置了一個 API Resources 功能,在此基礎上我實現了一個 JsonApiSerializer,可以和框架完美融合,代碼如下:
<?phpnamespace App/Http/Serializers;use Illuminate/Http/Resources/MissingValue;use Illuminate/Http/Resources/Json/Resource;use Illuminate/Http/Resources/Json/ResourceCollection;use Illuminate/Pagination/AbstractPaginator;class JsonApiSerializer implements /JsonSerializable{ protected $resource; protected $resourceValue; protected $data = []; protected static $included = []; public function __construct($resource, $resourceValue) { $this->resource = $resource; $this->resourceValue = $resourceValue; } public function jsonSerialize() { foreach ($this->resourceValue as $key => $value) { if ($value instanceof Resource) { $this->serializeResource($key, $value); } else { $this->serializeNonResource($key, $value); } } if (!$this->isRootResource()) { return $this->data; } $result = [ 'data' => $this->data, ]; if (static::$included) { $result['included'] = static::$included; } if (!$this->resource->resource instanceof AbstractPaginator) { return $result; } $paginated = $this->resource->resource->toArray(); $result['links'] = $this->links($paginated); $result['meta'] = $this->meta($paginated); return $result; } protected function serializeResource($key, $value, $type = null) { if ($type === null) { $type = $key; } if ($value->resource instanceof MissingValue) { return; } if ($value instanceof ResourceCollection) { foreach ($value as $k => $v) { $this->serializeResource($k, $v, $type); } } elseif (is_string($type)) { $included = $value->resolve(); $data = [ 'type' => $included['type'], 'id' => $included['id'], ]; if (is_int($key)) { $this->data['relationships'][$type]['data'][] = $data; } else { $this->data['relationships'][$type]['data'] = $data; } static::$included[] = $included; } else { $this->data[] = $value->resolve(); } } protected function serializeNonResource($key, $value) { switch ($key) { case 'id': $value = (string)$value; case 'type': case 'links': $this->data[$key] = $value; break; default: $this->data['attributes'][$key] = $value; } } protected function links($paginated) { return [ 'first' => $paginated['first_page_url'] ?? null, 'last' => $paginated['last_page_url'] ?? null, 'prev' => $paginated['prev_page_url'] ?? null, 'next' => $paginated['next_page_url'] ?? null, ]; } protected function meta($paginated) { return [ 'current_page' => $paginated['current_page'] ?? null, 'from' => $paginated['from'] ?? null, 'last_page' => $paginated['last_page'] ?? null, 'per_page' => $paginated['per_page'] ?? null, 'to' => $paginated['to'] ?? null, 'total' => $paginated['total'] ?? null, ]; } protected function isRootResource() { return isset($this->resource->isRoot) && $this->resource->isRoot; }}?>
對應的 Resource 基本還和以前一樣,只是返回值改了一下:
<?phpnamespace App/Http/Resources;use App/Article;use Illuminate/Http/Resources/Json/Resource;use App/Http/Serializers/JsonApiSerializer;class ArticleResource extends Resource{ public function toArray($request) { $value = [ 'type' => 'articles', 'id' => $this->id, 'name' => $this->name, 'author' => $this->whenLoaded('author'), ]; return new JsonApiSerializer($this, $value); }}?>
對應的 Controller 也和原來差不多,只是加入了一個 isRoot 屬性,用來識別根:
<?phpnamespace App/Http/Controllers;use App/Article;use App/Http/Resources/ArticleResource;class ArticleController extends Controller{ protected $article; public function __construct(Article $article) { $this->article = $article; } public function show($id) { $article = $this->article->with('author')->findOrFail($id); $resource = new ArticleResource($article); $resource->isRoot = true; return $resource; }}?>
整個過程沒有對 Laravel 的架構進行太大的侵入,可以說是目前 Laravel 實現 JSONAPI 的最優解決方案了,有興趣的可以研究一下 JsonApiSerializer 的實現,雖然只有一百多行代碼,但是我卻費了好大的力氣才實現,可以說是行行皆辛苦啊。
總結
以上所述是小編給大家介紹的JSONAPI在PHP中的應用,希望對大家有所幫助,如果大家有任何疑問歡迎給我留言,小編會及時回復大家的!
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