40 lines
1.3 KiB
PHP
40 lines
1.3 KiB
PHP
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<?php
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function cache_get($isbn){
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if(!file_exists("2/isbnCacheImg.json")) return false;
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$data = json_decode(file_get_contents("2/isbnCacheImg.json"),true);
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if(!$data) return false;
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$res = $data[$isbn];
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if(!$res) return false;
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if($res["time"] + $GLOBALS["imageISBNCache"] < time()) return false;
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return $res["url"];
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}
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function cache_set($isbn,$url){
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if(file_exists("2/isbnCacheImg.json")){
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$data = json_decode(file_get_contents("2/isbnCacheImg.json"),true)?:[];
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}
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else{
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$data = [];
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}
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$data[$isbn] = ["time"=>time(),"url"=>$url];
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file_put_contents("2/isbnCacheImg.json", json_encode($data));
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}
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function isbnImage($isbn){
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$url = cache_get($isbn);
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if($url) return $url;
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$curlSES=curl_init();
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curl_setopt($curlSES,CURLOPT_URL,"https://www.googleapis.com/books/v1/volumes?q=isbn:".urlencode($isbn));
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curl_setopt($curlSES,CURLOPT_RETURNTRANSFER,true);
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curl_setopt($curlSES,CURLOPT_HEADER, false);
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$result=curl_exec($curlSES);
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curl_close($curlSES);
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$data=json_decode($result,true);
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if(!$data) return "books.png";
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$images=$data["items"][0]["volumeInfo"]["imageLinks"];
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$lak = array_keys($images);
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$le = $lak[count($lak)-1];
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$url = $images[$le]?: "books.png";
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cache_set($isbn,$url);
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return $url;
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}
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?>
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