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<?php |
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namespace alsvanzelf\jsonapi\profiles; |
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use alsvanzelf\jsonapi\Document; |
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use alsvanzelf\jsonapi\ResourceDocument; |
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use alsvanzelf\jsonapi\interfaces\PaginableInterface; |
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use alsvanzelf\jsonapi\interfaces\ProfileInterface; |
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use alsvanzelf\jsonapi\interfaces\ResourceInterface; |
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use alsvanzelf\jsonapi\objects\ErrorObject; |
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use alsvanzelf\jsonapi\objects\LinkObject; |
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/** |
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* cursor-based pagination (aka keyset pagination) is a common pagination strategy that avoids many of the pitfalls of 'offset–limit' pagination |
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* |
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* @see https://jsonapi.org/profiles/ethanresnick/cursor-pagination/ |
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* |
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* related query parameters: |
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* - sort |
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* - page[size] |
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* - page[before] |
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* - page[after] |
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* |
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* handling different use cases: |
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* |
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* 1. handle requests with 'after' nor 'before' when the client requests a first page |
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* call {@see setLinksFirstPage} with the last cursor in the first page |
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* |
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* 2. handle requests with 'after' when the client requests a next page |
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* call {@see setLinks} with the first and last cursor in the current page |
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* call {@see setLinksLastPage} with the first cursor in the current page, when this is the last page |
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* |
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* 3. handle requests with 'before' when the client requests a previous page |
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* call {@see setLinks} with the first and last cursor in the current page |
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* |
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* 4. handle requests with 'after' and 'before' when the client requests a specific page |
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* call {@see setLinks} with the first and last cursor in the current page, when there are previous/next pages |
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* call {@see setPaginationLinkObjectsExplicitlyEmpty}, when the results is everything between after and before |
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* |
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* other interesting methods: |
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* - {@see setCursor} to expose the cursor of a pagination item to allow custom url building |
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* - {@see setCount} to expose the total count(s) of the pagination data |
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* - {@see get*ErrorObject} to generate ErrorObjects for specific error cases |
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* - {@see generatePreviousLink} {@see generateNextLink} to apply the links manually |
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*/ |
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class CursorPaginationProfile implements ProfileInterface { |
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/** |
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* human api |
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*/ |
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/** |
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* set links to paginate the data using cursors of the paginated data |
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* |
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* @param PaginableInterface $paginable a CollectionDocument or RelationshipObject |
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* @param string $baseOrCurrentUrl |
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* @param string $firstCursor |
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* @param string $lastCursor |
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*/ |
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public function setLinks(PaginableInterface $paginable, $baseOrCurrentUrl, $firstCursor, $lastCursor) { |
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$previousLinkObject = new LinkObject($this->generatePreviousLink($baseOrCurrentUrl, $firstCursor)); |
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$nextLinkObject = new LinkObject($this->generateNextLink($baseOrCurrentUrl, $lastCursor)); |
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$this->setPaginationLinkObjects($paginable, $previousLinkObject, $nextLinkObject); |
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} |
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/** |
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* @param PaginableInterface $paginable a CollectionDocument or RelationshipObject |
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* @param string $baseOrCurrentUrl |
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* @param string $lastCursor |
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*/ |
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public function setLinksFirstPage(PaginableInterface $paginable, $baseOrCurrentUrl, $lastCursor) { |
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$this->setPaginationLinkObjectsWithoutPrevious($paginable, $baseOrCurrentUrl, $lastCursor); |
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} |
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/** |
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* @param PaginableInterface $paginable a CollectionDocument or RelationshipObject |
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* @param string $baseOrCurrentUrl |
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* @param string $firstCursor |
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*/ |
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public function setLinksLastPage(PaginableInterface $paginable, $baseOrCurrentUrl, $firstCursor) { |
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$this->setPaginationLinkObjectsWithoutNext($paginable, $baseOrCurrentUrl, $firstCursor); |
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} |
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/** |
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* set the cursor of a specific resource to allow pagination after or before this resource |
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* |
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* @param ResourceInterface $resource |
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* @param string $cursor |
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*/ |
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public function setCursor(ResourceInterface $resource, $cursor) { |
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$this->setItemMeta($resource, $cursor); |
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} |
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/** |
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* set count(s) to tell about the (estimated) total size |
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* |
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* @param PaginableInterface $paginable a CollectionDocument or RelationshipObject |
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* @param int $exactTotal optional |
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* @param int $bestGuessTotal optional |
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*/ |
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public function setCount(PaginableInterface $paginable, $exactTotal=null, $bestGuessTotal=null) { |
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$this->setPaginationMeta($paginable, $exactTotal, $bestGuessTotal); |
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} |
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/** |
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* spec api |
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*/ |
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/** |
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* helper to get generate a correct page[before] link, use to apply manually |
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* |
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* @param string $baseOrCurrentUrl |
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* @param string $beforeCursor |
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* @return string |
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*/ |
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public function generatePreviousLink($baseOrCurrentUrl, $beforeCursor) { |
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return $this->setQueryParameter($baseOrCurrentUrl, 'page[before]', $beforeCursor); |
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} |
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/** |
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* helper to get generate a correct page[after] link, use to apply manually |
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* |
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* @param string $baseOrCurrentUrl |
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* @param string $afterCursor |
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* @return string |
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*/ |
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public function generateNextLink($baseOrCurrentUrl, $afterCursor) { |
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return $this->setQueryParameter($baseOrCurrentUrl, 'page[after]', $afterCursor); |
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} |
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/** |
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* pagination links are inside the links object that is a sibling of the paginated data |
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* |
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* ends up at one of: |
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* - /links/prev & /links/next |
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* - /data/relationships/foo/links/prev & /data/relationships/foo/links/next |
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* - /data/0/relationships/foo/links/prev & /data/0/relationships/foo/links/next |
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* |
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* @see https://jsonapi.org/profiles/ethanresnick/cursor-pagination/#terms-pagination-links |
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* |
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* @param PaginableInterface $paginable |
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* @param LinkObject $previousLinkObject |
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* @param LinkObject $nextLinkObject |
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*/ |
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public function setPaginationLinkObjects(PaginableInterface $paginable, LinkObject $previousLinkObject, LinkObject $nextLinkObject) { |
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$paginable->addLinkObject('prev', $previousLinkObject); |
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$paginable->addLinkObject('next', $nextLinkObject); |
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} |
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/** |
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* @param PaginableInterface $paginable |
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* @param string $baseOrCurrentUrl |
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* @param string $firstCursor |
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*/ |
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public function setPaginationLinkObjectsWithoutNext(PaginableInterface $paginable, $baseOrCurrentUrl, $firstCursor) { |
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$this->setPaginationLinkObjects($paginable, new LinkObject($this->generatePreviousLink($baseOrCurrentUrl, $firstCursor)), new LinkObject()); |
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} |
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/** |
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* @param PaginableInterface $paginable |
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* @param string $baseOrCurrentUrl |
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* @param string $lastCursor |
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*/ |
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public function setPaginationLinkObjectsWithoutPrevious(PaginableInterface $paginable, $baseOrCurrentUrl, $lastCursor) { |
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$this->setPaginationLinkObjects($paginable, new LinkObject(), new LinkObject($this->generateNextLink($baseOrCurrentUrl, $lastCursor))); |
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} |
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/** |
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* @param PaginableInterface $paginable |
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*/ |
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public function setPaginationLinkObjectsExplicitlyEmpty(PaginableInterface $paginable) { |
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$this->setPaginationLinkObjects($paginable, new LinkObject(), new LinkObject()); |
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} |
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/** |
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* pagination item metadata is the page meta at the top-level of a paginated item |
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* |
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* ends up at one of: |
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* - /data/meta/page |
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* - /data/relationships/foo/meta/page |
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* - /data/0/relationships/foo/meta/page |
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* |
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* @see https://jsonapi.org/profiles/ethanresnick/cursor-pagination/#terms-pagination-item-metadata |
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* |
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* @param ResourceInterface $resource |
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* @param string $cursor |
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*/ |
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public function setItemMeta(ResourceInterface $resource, $cursor) { |
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$metadata = [ |
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'cursor' => $cursor, |
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]; |
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if ($resource instanceof ResourceDocument) { |
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$resource->addMeta('page', $metadata, $level=Document::LEVEL_RESOURCE); |
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} |
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else { |
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$resource->addMeta('page', $metadata); |
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} |
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} |
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/** |
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* pagination metadata is the page meta that is a sibling of the paginated data (and pagination links) |
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* |
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* ends up at one of: |
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* - /meta/page/total & /meta/page/estimatedTotal/bestGuess & /meta/page/rangeTruncated |
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* - /data/relationships/foo/meta/page/total & /data/relationships/foo/meta/page/estimatedTotal/bestGuess & /data/relationships/foo/meta/page/rangeTruncated |
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* - /data/0/relationships/foo/meta/page/total & /data/0/relationships/foo/meta/page/estimatedTotal/bestGuess & /data/0/relationships/foo/meta/page/rangeTruncated |
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* |
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* @see https://jsonapi.org/profiles/ethanresnick/cursor-pagination/#terms-pagination-metadata |
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* |
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* @param PaginableInterface $paginable |
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* @param int $exactTotal optional |
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* @param int $bestGuessTotal optional |
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* @param boolean $rangeIsTruncated optional, if both after and before are supplied but the items exceed requested or max size |
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*/ |
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public function setPaginationMeta(PaginableInterface $paginable, $exactTotal=null, $bestGuessTotal=null, $rangeIsTruncated=null) { |
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$metadata = []; |
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if ($exactTotal !== null) { |
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$metadata['total'] = $exactTotal; |
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} |
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if ($bestGuessTotal !== null) { |
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$metadata['estimatedTotal'] = [ |
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'bestGuess' => $bestGuessTotal, |
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]; |
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} |
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if ($rangeIsTruncated !== null) { |
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$metadata['rangeTruncated'] = $rangeIsTruncated; |
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} |
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$paginable->addMeta('page', $metadata); |
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} |
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/** |
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* get an ErrorObject for when the requested sorting cannot efficiently be paginated |
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* |
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* ends up at: |
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* - /errors/0/code |
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* - /errors/0/status |
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* - /errors/0/source/parameter |
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* - /errors/0/links/type/0 |
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* - /errors/0/title optional |
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* - /errors/0/detail optional |
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* |
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* @param string $genericTitle optional |
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* @param string $specificDetails optional |
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* @return ErrorObject |
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*/ |
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public function getUnsupportedSortErrorObject($genericTitle=null, $specificDetails=null) { |
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$errorObject = new ErrorObject('Unsupported sort'); |
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$errorObject->setTypeLink('https://jsonapi.org/profiles/ethanresnick/cursor-pagination/unsupported-sort'); |
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$errorObject->blameQueryParameter('sort'); |
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$errorObject->setHttpStatusCode(400); |
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if ($genericTitle !== null) { |
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$errorObject->setHumanExplanation($genericTitle, $specificDetails); |
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} |
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1 |
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return $errorObject; |
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} |
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/** |
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* get an ErrorObject for when the requested page size exceeds the server-defined max page size |
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* |
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* ends up at: |
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* - /errors/0/code |
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* - /errors/0/status |
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* - /errors/0/source/parameter |
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* - /errors/0/links/type/0 |
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* - /errors/0/meta/page/maxSize |
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* - /errors/0/title optional |
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* - /errors/0/detail optional |
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* |
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* @param int $maxSize |
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* @param string $genericTitle optional, e.g. 'Page size requested is too large.' |
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* @param string $specificDetails optional, e.g. 'You requested a size of 200, but 100 is the maximum.' |
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* @return ErrorObject |
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*/ |
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public function getMaxPageSizeExceededErrorObject($maxSize, $genericTitle=null, $specificDetails=null) { |
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$errorObject = new ErrorObject('Max page size exceeded'); |
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$errorObject->setTypeLink('https://jsonapi.org/profiles/ethanresnick/cursor-pagination/max-size-exceeded'); |
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$errorObject->blameQueryParameter('page[size]'); |
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$errorObject->setHttpStatusCode(400); |
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$errorObject->addMeta('page', $value=['maxSize' => $maxSize]); |
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1 |
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if ($genericTitle !== null) { |
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$errorObject->setHumanExplanation($genericTitle, $specificDetails); |
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} |
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1 |
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return $errorObject; |
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} |
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/** |
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* get an ErrorObject for when the requested page size is not a positive integer, or when the requested page after/before is not a valid cursor |
|
295
|
|
|
* |
|
296
|
|
|
* ends up at: |
|
297
|
|
|
* - /errors/0/code |
|
298
|
|
|
* - /errors/0/status |
|
299
|
|
|
* - /errors/0/source/parameter |
|
300
|
|
|
* - /errors/0/links/type/0 optional |
|
301
|
|
|
* - /errors/0/title optional |
|
302
|
|
|
* - /errors/0/detail optional |
|
303
|
|
|
* |
|
304
|
|
|
* @param int $queryParameter e.g. 'sort' or 'page[size]' |
|
305
|
|
|
* @param string $typeLink optional |
|
306
|
|
|
* @param string $genericTitle optional, e.g. 'Invalid Parameter.' |
|
307
|
|
|
* @param string $specificDetails optional, e.g. 'page[size] must be a positive integer; got 0' |
|
308
|
|
|
* @return ErrorObject |
|
309
|
|
|
*/ |
|
310
|
1 |
|
public function getInvalidParameterValueErrorObject($queryParameter, $typeLink=null, $genericTitle=null, $specificDetails=null) { |
|
311
|
1 |
|
$errorObject = new ErrorObject('Invalid parameter value'); |
|
312
|
1 |
|
$errorObject->blameQueryParameter($queryParameter); |
|
313
|
1 |
|
$errorObject->setHttpStatusCode(400); |
|
314
|
|
|
|
|
315
|
1 |
|
if ($typeLink !== null) { |
|
316
|
1 |
|
$errorObject->setTypeLink($typeLink); |
|
317
|
|
|
} |
|
318
|
|
|
|
|
319
|
1 |
|
if ($genericTitle !== null) { |
|
320
|
1 |
|
$errorObject->setHumanExplanation($genericTitle, $specificDetails); |
|
321
|
|
|
} |
|
322
|
|
|
|
|
323
|
1 |
|
return $errorObject; |
|
324
|
|
|
} |
|
325
|
|
|
|
|
326
|
|
|
/** |
|
327
|
|
|
* get an ErrorObject for when range pagination requests (when both 'page[after]' and 'page[before]' are requested) are not supported |
|
328
|
|
|
* |
|
329
|
|
|
* ends up at: |
|
330
|
|
|
* - /errors/0/code |
|
331
|
|
|
* - /errors/0/status |
|
332
|
|
|
* - /errors/0/links/type/0 |
|
333
|
|
|
* |
|
334
|
|
|
* @param string $genericTitle optional |
|
335
|
|
|
* @param string $specificDetails optional |
|
336
|
|
|
* @return ErrorObject |
|
337
|
|
|
*/ |
|
338
|
1 |
|
public function getRangePaginationNotSupportedErrorObject($genericTitle=null, $specificDetails=null) { |
|
339
|
1 |
|
$errorObject = new ErrorObject('Range pagination not supported'); |
|
340
|
1 |
|
$errorObject->setTypeLink('https://jsonapi.org/profiles/ethanresnick/cursor-pagination/range-pagination-not-supported'); |
|
341
|
1 |
|
$errorObject->setHttpStatusCode(400); |
|
342
|
|
|
|
|
343
|
1 |
|
if ($genericTitle !== null) { |
|
344
|
1 |
|
$errorObject->setHumanExplanation($genericTitle, $specificDetails); |
|
345
|
|
|
} |
|
346
|
|
|
|
|
347
|
1 |
|
return $errorObject; |
|
348
|
|
|
} |
|
349
|
|
|
|
|
350
|
|
|
/** |
|
351
|
|
|
* internal api |
|
352
|
|
|
*/ |
|
353
|
|
|
|
|
354
|
|
|
/** |
|
355
|
|
|
* add or adjust a key in the query string of a url |
|
356
|
|
|
* |
|
357
|
|
|
* @param string $url |
|
358
|
|
|
* @param string $key |
|
359
|
|
|
* @param string $value |
|
360
|
|
|
*/ |
|
361
|
7 |
|
private function setQueryParameter($url, $key, $value) { |
|
362
|
7 |
|
$originalQuery = parse_url($url, PHP_URL_QUERY); |
|
363
|
7 |
|
$decodedQuery = urldecode($originalQuery); |
|
364
|
7 |
|
$originalIsEncoded = ($decodedQuery !== $originalQuery); |
|
365
|
|
|
|
|
366
|
7 |
|
$originalParameters = []; |
|
367
|
7 |
|
parse_str($decodedQuery, $originalParameters); |
|
368
|
|
|
|
|
369
|
7 |
|
$newParameters = []; |
|
370
|
7 |
|
parse_str($key.'='.$value, $newParameters); |
|
371
|
|
|
|
|
372
|
7 |
|
$fullParameters = array_replace_recursive($originalParameters, $newParameters); |
|
373
|
|
|
|
|
374
|
7 |
|
$newQuery = http_build_query($fullParameters); |
|
375
|
7 |
|
if ($originalIsEncoded === false) { |
|
376
|
6 |
|
$newQuery = urldecode($newQuery); |
|
377
|
|
|
} |
|
378
|
|
|
|
|
379
|
7 |
|
$newUrl = str_replace($originalQuery, $newQuery, $url); |
|
380
|
|
|
|
|
381
|
7 |
|
return $newUrl; |
|
382
|
|
|
} |
|
383
|
|
|
|
|
384
|
|
|
/** |
|
385
|
|
|
* ProfileInterface |
|
386
|
|
|
*/ |
|
387
|
|
|
|
|
388
|
|
|
/** |
|
389
|
|
|
* @inheritDoc |
|
390
|
|
|
*/ |
|
391
|
8 |
|
public function getOfficialLink() { |
|
392
|
8 |
|
return 'https://jsonapi.org/profiles/ethanresnick/cursor-pagination/'; |
|
393
|
|
|
} |
|
394
|
|
|
|
|
395
|
|
|
/** |
|
396
|
|
|
* returns the keyword without aliasing |
|
397
|
|
|
* |
|
398
|
|
|
* @deprecated since aliasing was removed from the profiles spec |
|
399
|
|
|
* |
|
400
|
|
|
* @param string $keyword |
|
401
|
|
|
* @return string |
|
402
|
|
|
*/ |
|
403
|
1 |
|
public function getKeyword($keyword) { |
|
404
|
1 |
|
return $keyword; |
|
405
|
|
|
} |
|
406
|
|
|
} |
|
407
|
|
|
|
lode /
jsonapi
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