{"id":117454,"date":"2024-03-23T10:26:40","date_gmt":"2024-03-23T01:26:40","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/golang%e3%81%a7%e3%83%81%e3%83%a3%e3%83%b3%e3%82%af%e8%bb%a2%e9%80%81%e3%82%a2%e3%83%83%e3%83%97%e3%83%ad%e3%83%bc%e3%83%89%e3%82%92%e5%ae%9f%e7%8f%be%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/"},"modified":"2024-04-04T22:28:01","modified_gmt":"2024-04-04T13:28:01","slug":"golang%e3%81%a7%e3%83%81%e3%83%a3%e3%83%b3%e3%82%af%e8%bb%a2%e9%80%81%e3%82%a2%e3%83%83%e3%83%97%e3%83%ad%e3%83%bc%e3%83%89%e3%82%92%e5%ae%9f%e7%8f%be%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/golang%e3%81%a7%e3%83%81%e3%83%a3%e3%83%b3%e3%82%af%e8%bb%a2%e9%80%81%e3%82%a2%e3%83%83%e3%83%97%e3%83%ad%e3%83%bc%e3%83%89%e3%82%92%e5%ae%9f%e7%8f%be%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/","title":{"rendered":"Golang\u3067\u30c1\u30e3\u30f3\u30af\u8ee2\u9001\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>Go\u8a00\u8a9e\u306e\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u3067\u90e8\u5206\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3092\u5b9f\u73fe\u3059\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u624b\u9806\u306b\u5f93\u3044\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u30d5\u30a1\u30a4\u30eb\u8981\u6c42\u6642\u306bHTTP\u8981\u6c42\u30d8\u30c3\u30c0\u30fc\u90e8\u306bRange\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u8ffd\u52a0\u3057\u3001\u8981\u6c42\u5bfe\u8c61\u30d5\u30a1\u30a4\u30eb\u306e\u958b\u59cb\u4f4d\u7f6e\u3092\u660e\u793a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/li>\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u30ea\u30af\u30a8\u30b9\u30c8\u30d8\u30c3\u30c0\u306eRange\u30d5\u30a3\u30fc\u30eb\u30c9\u3067\u65ad\u7247\u7684\u306a\u518d\u958b\u304c\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u30b5\u30fc\u30d0\u304c\u78ba\u8a8d\u3059\u308b<\/li>\n<li>Range\u30d8\u30c3\u30c0\u30fc\u306e\u5024\u306b\u5fdc\u3058\u3066\u3001\u30b5\u30fc\u30d0\u306f\u30d5\u30a1\u30a4\u30eb\u306e\u4e00\u90e8\u3092\u8aad\u307f\u8fbc\u307f\u3001\u8aad\u307f\u8fbc\u307e\u308c\u305f\u5185\u5bb9\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u8fd4\u3057\u307e\u3059\u3002<\/li>\n<li>\u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u304c\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u30b5\u30fc\u30d0\u306f\u5b8c\u5168\u306a\u30d5\u30a1\u30a4\u30eb\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u8fd4\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u4ee5\u4e0b\u306f\u3001\u518d\u958b\u53ef\u80fd\u306a\u65ad\u70b9\u3092\u5b9e\u73b0\u3059\u308b\u305f\u3081\u306e\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">handleFileDownload<\/span><span class=\"hljs-params\">(w http.ResponseWriter, r *http.Request)<\/span><\/span> {\r\nfile, err := os.Open(<span class=\"hljs-string\">\"path\/to\/file\"<\/span>) <span class=\"hljs-comment\">\/\/ \u6253\u5f00\u6587\u4ef6<\/span>\r\n<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\nhttp.Error(w, <span class=\"hljs-string\">\"File not found\"<\/span>, http.StatusNotFound)\r\n<span class=\"hljs-keyword\">return<\/span>\r\n}\r\n<span class=\"hljs-keyword\">defer<\/span> file.Close()\r\nfileInfo, err := file.Stat()\r\n<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\nhttp.Error(w, <span class=\"hljs-string\">\"Internal server error\"<\/span>, http.StatusInternalServerError)\r\n<span class=\"hljs-keyword\">return<\/span>\r\n}\r\nfileSize := fileInfo.Size()\r\nrangeHeader := r.Header.Get(<span class=\"hljs-string\">\"Range\"<\/span>) <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u8bf7\u6c42\u5934\u4e2d\u7684Range\u5b57\u6bb5<\/span>\r\n<span class=\"hljs-keyword\">if<\/span> rangeHeader != <span class=\"hljs-string\">\"\"<\/span> { <span class=\"hljs-comment\">\/\/ \u5982\u679c\u8bf7\u6c42\u5934\u4e2d\u5b58\u5728Range\u5b57\u6bb5<\/span>\r\nranges, err := parseRangeHeader(rangeHeader, fileSize) <span class=\"hljs-comment\">\/\/ \u89e3\u6790Range\u5b57\u6bb5<\/span>\r\n<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\nhttp.Error(w, <span class=\"hljs-string\">\"Invalid range header\"<\/span>, http.StatusBadRequest)\r\n<span class=\"hljs-keyword\">return<\/span>\r\n}\r\n<span class=\"hljs-keyword\">if<\/span> <span class=\"hljs-built_in\">len<\/span>(ranges) == <span class=\"hljs-number\">1<\/span> { <span class=\"hljs-comment\">\/\/ \u5982\u679c\u53ea\u6709\u4e00\u4e2a\u8303\u56f4<\/span>\r\nstart := ranges[<span class=\"hljs-number\">0<\/span>].start\r\nend := ranges[<span class=\"hljs-number\">0<\/span>].end\r\n<span class=\"hljs-keyword\">if<\/span> start &lt; <span class=\"hljs-number\">0<\/span> || start &gt;= fileSize || end &gt;= fileSize || end &lt; start {\r\nhttp.Error(w, <span class=\"hljs-string\">\"Invalid range\"<\/span>, http.StatusBadRequest)\r\n<span class=\"hljs-keyword\">return<\/span>\r\n}\r\nw.Header().Set(<span class=\"hljs-string\">\"Content-Length\"<\/span>, strconv.FormatInt(end-start+<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">10<\/span>))\r\nw.Header().Set(<span class=\"hljs-string\">\"Content-Range\"<\/span>, fmt.Sprintf(<span class=\"hljs-string\">\"bytes %d-%d\/%d\"<\/span>, start, end, fileSize))\r\nw.WriteHeader(http.StatusPartialContent)\r\n_, err := file.Seek(start, io.SeekStart)\r\n<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\nhttp.Error(w, <span class=\"hljs-string\">\"Internal server error\"<\/span>, http.StatusInternalServerError)\r\n<span class=\"hljs-keyword\">return<\/span>\r\n}\r\nio.CopyN(w, file, end-start+<span class=\"hljs-number\">1<\/span>) <span class=\"hljs-comment\">\/\/ \u5c06\u6587\u4ef6\u5185\u5bb9\u5199\u5165ResponseWriter<\/span>\r\n<span class=\"hljs-keyword\">return<\/span>\r\n} <span class=\"hljs-keyword\">else<\/span> {\r\n<span class=\"hljs-comment\">\/\/ \u5982\u679c\u6709\u591a\u4e2a\u8303\u56f4\uff0c\u6682\u4e0d\u652f\u6301\u65ad\u70b9\u7eed\u4f20<\/span>\r\nhttp.Error(w, <span class=\"hljs-string\">\"Multiple ranges not supported\"<\/span>, http.StatusBadRequest)\r\n<span class=\"hljs-keyword\">return<\/span>\r\n}\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u5982\u679c\u8bf7\u6c42\u5934\u4e2d\u4e0d\u5b58\u5728Range\u5b57\u6bb5\uff0c\u8fd4\u56de\u5b8c\u6574\u6587\u4ef6<\/span>\r\nw.Header().Set(<span class=\"hljs-string\">\"Content-Length\"<\/span>, strconv.FormatInt(fileSize, <span class=\"hljs-number\">10<\/span>))\r\nw.WriteHeader(http.StatusOK)\r\nio.Copy(w, file) <span class=\"hljs-comment\">\/\/ \u5c06\u6587\u4ef6\u5185\u5bb9\u5199\u5165ResponseWriter<\/span>\r\n}\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">parseRangeHeader<\/span><span class=\"hljs-params\">(rangeHeader <span class=\"hljs-type\">string<\/span>, fileSize <span class=\"hljs-type\">int64<\/span>)<\/span><\/span> ([]rangeInfo, <span class=\"hljs-type\">error<\/span>) {\r\nranges := <span class=\"hljs-built_in\">make<\/span>([]rangeInfo, <span class=\"hljs-number\">0<\/span>)\r\nrangeStrs := strings.Split(rangeHeader, <span class=\"hljs-string\">\",\"<\/span>)\r\n<span class=\"hljs-keyword\">for<\/span> _, rangeStr := <span class=\"hljs-keyword\">range<\/span> rangeStrs {\r\nparts := strings.SplitN(rangeStr, <span class=\"hljs-string\">\"=\"<\/span>, <span class=\"hljs-number\">2<\/span>)\r\n<span class=\"hljs-keyword\">if<\/span> <span class=\"hljs-built_in\">len<\/span>(parts) != <span class=\"hljs-number\">2<\/span> || parts[<span class=\"hljs-number\">0<\/span>] != <span class=\"hljs-string\">\"bytes\"<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">nil<\/span>, errors.New(<span class=\"hljs-string\">\"Invalid range header\"<\/span>)\r\n}\r\nrangeParts := strings.Split(parts[<span class=\"hljs-number\">1<\/span>], <span class=\"hljs-string\">\"-\"<\/span>)\r\n<span class=\"hljs-keyword\">if<\/span> <span class=\"hljs-built_in\">len<\/span>(rangeParts) != <span class=\"hljs-number\">2<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">nil<\/span>, errors.New(<span class=\"hljs-string\">\"Invalid range header\"<\/span>)\r\n}\r\nstart, err := strconv.ParseInt(rangeParts[<span class=\"hljs-number\">0<\/span>], <span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">64<\/span>)\r\n<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">nil<\/span>, err\r\n}\r\nend, err := strconv.ParseInt(rangeParts[<span class=\"hljs-number\">1<\/span>], <span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">64<\/span>)\r\n<span class=\"hljs-keyword\">if<\/span> err != <span class=\"hljs-literal\">nil<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">nil<\/span>, err\r\n}\r\n<span class=\"hljs-keyword\">if<\/span> start &gt;= <span class=\"hljs-number\">0<\/span> &amp;&amp; start &lt;= fileSize {\r\nranges = <span class=\"hljs-built_in\">append<\/span>(ranges, rangeInfo{start, end})\r\n}\r\n}\r\n<span class=\"hljs-keyword\">return<\/span> ranges, <span class=\"hljs-literal\">nil<\/span>\r\n}\r\n<span class=\"hljs-keyword\">type<\/span> rangeInfo <span class=\"hljs-keyword\">struct<\/span> {\r\nstart <span class=\"hljs-type\">int64<\/span>\r\nend   <span class=\"hljs-type\">int64<\/span>\r\n}\r\n<\/code><\/pre>\n<p>\u672c\u30b3\u30fc\u30c9\u306f Range \u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u89e3\u6790\u3057\u3066\u3001\u30ec\u30f3\u30b8\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\uff08\u90e8\u5206\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\uff09\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u8981\u6c42\u306e\u7bc4\u56f2\u306b\u57fa\u3065\u3044\u3066\u30d5\u30a1\u30a4\u30eb\u5185\u5bb9\u3092\u8aad\u307f\u8fbc\u307f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u8fd4\u3057\u307e\u3059\u3002\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u5b8c\u5168\u7248\u3092\u8fd4\u3057\u307e\u3059\u3002\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u5b9f\u969b\u306e\u72b6\u6cc1\u306b\u5408\u308f\u305b\u3066\u9069\u5207\u306b\u5909\u66f4\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Go\u8a00\u8a9e\u306e\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u3067\u90e8\u5206\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3092\u5b9f\u73fe\u3059\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u624b\u9806\u306b\u5f93\u3044\u307e\u3059\u3002 \u30d5\u30a1\u30a4\u30eb\u8981\u6c42\u6642\u306bHTTP\u8981\u6c42\u30d8\u30c3\u30c0\u30fc\u90e8\u306bRange\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u8ffd\u52a0\u3057\u3001\u8981\u6c42\u5bfe\u8c61\u30d5\u30a1\u30a4\u30eb\u306e\u958b\u59cb\u4f4d\u7f6e\u3092\u660e\u793a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002 \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u30ea\u30af [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-117454","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Golang\u3067\u30c1\u30e3\u30f3\u30af\u8ee2\u9001\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/golang\u3067\u30c1\u30e3\u30f3\u30af\u8ee2\u9001\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Golang\u3067\u30c1\u30e3\u30f3\u30af\u8ee2\u9001\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"Go\u8a00\u8a9e\u306e\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u3067\u90e8\u5206\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3092\u5b9f\u73fe\u3059\u308b\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u624b\u9806\u306b\u5f93\u3044\u307e\u3059\u3002 \u30d5\u30a1\u30a4\u30eb\u8981\u6c42\u6642\u306bHTTP\u8981\u6c42\u30d8\u30c3\u30c0\u30fc\u90e8\u306bRange\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u8ffd\u52a0\u3057\u3001\u8981\u6c42\u5bfe\u8c61\u30d5\u30a1\u30a4\u30eb\u306e\u958b\u59cb\u4f4d\u7f6e\u3092\u660e\u793a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002 \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u30ea\u30af [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/golang\u3067\u30c1\u30e3\u30f3\u30af\u8ee2\u9001\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3092\u5b9f\u73fe\u3059\u308b\u65b9\u6cd5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-23T01:26:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-04T13:28:01+00:00\" \/>\n<meta name=\"author\" content=\"\u5149, \u660e\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" 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