353 lines
14 KiB
JavaScript
353 lines
14 KiB
JavaScript
/**
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* Class for WebTV Mime Types and overrides
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*/
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class WTVMime {
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mime = require('mime-types');
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wtvshared = null;
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minisrv_config = [];
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constructor(minisrv_config) {
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const { WTVShared } = require("./WTVShared.js");
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this.minisrv_config = minisrv_config;
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this.wtvshared = new WTVShared(minisrv_config);
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if (!String.prototype.reverse) {
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String.prototype.reverse = function () {
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const splitString = this.split("");
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const reverseArray = splitString.reverse();
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const joinArray = reverseArray.join("");
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return joinArray;
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}
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}
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}
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shouldWeCompress(ssid_session, headers_obj) {
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let compress_data = false;
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let compression_type = 0; // no compression
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if (ssid_session) {
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if (ssid_session.capabilities) {
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if (ssid_session.capabilities.get('client-can-receive-compressed-data')) {
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if (this.minisrv_config.config.enable_lzpf_compression || this.minisrv_config.config.force_compression_type) {
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compression_type = 1; // lzpf
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}
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if (ssid_session) {
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// if gzip is enabled...
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if (this.minisrv_config.config.enable_gzip_compression || this.minisrv_config.config.force_compression_type) {
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const is_bf0app = ssid_session.get("wtv-client-rom-type") === "bf0app";
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const isOldBuild = this.wtvshared.isOldBuild(ssid_session);
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let is_softmodem = false;
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if (ssid_session.get("wtv-client-rom-type")) is_softmodem = ssid_session.get("wtv-client-rom-type").match(/softmodem/);
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if (!is_bf0app && ((!is_softmodem && !isOldBuild) || (is_softmodem && !isOldBuild))) {
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// softmodem boxes do not appear to support gzip in the minibrowser
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// LC2 appears to support gzip even in the MiniBrowser
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// LC2 and newer approms appear to support gzip
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// bf0app does not appear to support gzip
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compression_type = 2; // gzip
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}
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}
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}
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// mostly for debugging
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if (this.minisrv_config.config.force_compression_type === "lzpf") compression_type = 1;
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if (this.minisrv_config.config.force_compression_type === "gzip") compression_type = 2;
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// do not compress if already encoded
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if (headers_obj["Content-Encoding"]) return 0;
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// should we bother to compress?
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let content_type = "";
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if (typeof (headers_obj) === 'string') content_type = headers_obj;
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else content_type = (typeof (headers_obj["wtv-modern-content-type"]) !== 'undefined') ? headers_obj["wtv-modern-content-type"] : headers_obj["Content-type"];
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if (content_type) {
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// both lzpf and gzip
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if (content_type.match(/^text\//) && content_type !== "text/tellyscript") compress_data = true;
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else if (content_type.match(/^application\/(x-?)javascript$/)) compress_data = true;
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else if (content_type === "application/json") compress_data = true;
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if (compression_type === 2) {
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// gzip only
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if (content_type.match(/^audio\/(x-)?(s3m|mod|xm|midi|wav|wave|aif(f)?)$/)) compress_data = true; // s3m, mod, xm, midi & wav
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if (content_type.match(/^application\/karaoke$/)) compress_data = true; // midi karaoke
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if (content_type.match(/^binary\/(x-wtv-approm|doom-data)/)) compress_data = true; // approms and DOOM WADs
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if (content_type.match(/^wtv\/download-list$/)) compress_data = true; // WebTV Download List
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}
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}
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}
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}
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}
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// return compression_type if compress_data = true
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return (compress_data) ? compression_type : 0;
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}
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/**
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* Gets the WebTV Content-Type
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* @param {string} path Path to a file
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* @returns {string} Content-Type
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*/
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getSimpleContentType(path) {
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return this.getContentType(path)[0];
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}
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/**
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* Gets both the WebTV Content-Type and the Modern Content-Type
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* @param {string} path Path to a file
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* @returns {Array} (WebTV Content-Type, Modern Content-Type)
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*/
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getContentType(path) {
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const file_ext = this.wtvshared.getFileExt(path).toLowerCase();
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let wtv_mime_type, modern_mime_type;
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// process WebTV overrides, fall back to generic mime lookup
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switch (file_ext) {
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case "aif":
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wtv_mime_type = "audio/x-aif";
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break;
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case "aifc":
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wtv_mime_type = "audio/x-aifc";
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break;
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case "aiff":
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wtv_mime_type = "audio/x-aiff";
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break;
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case "ani":
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wtv_mime_type = "x-wtv-animation";
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break;
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case "brom":
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wtv_mime_type = "binary/x-wtv-bootrom";
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break;
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case "cdf":
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wtv_mime_type = "application/netcdf";
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break;
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case "dat":
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wtv_mime_type = "binary/cache-data";
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break;
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case "dl":
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wtv_mime_type = "wtv/download-list";
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break;
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case "gsm":
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wtv_mime_type = "audio/x-gsm";
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break;
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case "gz":
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wtv_mime_type = "application/gzip";
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break;
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case "ini":
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wtv_mime_type = "wtv/jack-configuration";
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break;
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case "kar":
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wtv_mime_type = "audio/midi";
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break;
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case "mips-code":
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wtv_mime_type = "code/x-wtv-code-mips";
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break;
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case "o":
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wtv_mime_type = "binary/x-wtv-approm";
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break;
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case "ram":
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wtv_mime_type = "audio/x-pn-realaudio";
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break;
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case "rom":
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wtv_mime_type = "binary/x-wtv-flashblock";
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break;
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case "rsp":
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wtv_mime_type = "wtv/jack-response";
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break;
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case "swa":
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case "swf":
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wtv_mime_type = "application/x-shockwave-flash";
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break;
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case "srf":
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case "spl":
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wtv_mime_type = "wtv/jack-data";
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break;
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case "ttf":
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wtv_mime_type = "wtv/jack-fonts";
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break;
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case "tvch":
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wtv_mime_type = "wtv/tv-channels";
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break;
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case "tvl":
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wtv_mime_type = "wtv/tv-listings";
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break;
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case "tvsl":
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wtv_mime_type = "wtv/tv-smartlinks";
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break;
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case "wad":
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wtv_mime_type = "binary/doom-data";
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break;
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case "kar":
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wtv_mime_type = "application/karaoke";
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break;
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case "mp2":
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case "hsb":
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case "rmf":
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case "s3m":
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case "mod":
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case "xm":
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wtv_mime_type = "application/Music";
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break;
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}
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modern_mime_type = this.mime.lookup(path);
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if (modern_mime_type === false) modern_mime_type = "application/octet-stream";
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if (typeof wtv_mime_type === 'undefined') wtv_mime_type = modern_mime_type;
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return new Array(wtv_mime_type, modern_mime_type);
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}
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/**
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* Attempts to detect the MIME type from a data buffer using magic numbers.
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* Falls back to 'application/octet-stream' if unknown.
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* @param {Buffer} buffer
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* @returns {string} Detected MIME type
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*/
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detectMimeTypeFromBuffer(buffer) {
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if (!Buffer.isBuffer(buffer) || buffer.length < 4) {
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return 'application/octet-stream';
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}
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// JPEG
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if (buffer[0] === 0xFF && buffer[1] === 0xD8 && buffer[2] === 0xFF) {
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return 'image/jpeg';
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}
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// PNG
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if (buffer.slice(0, 8).equals(Buffer.from([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]))) {
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return 'image/png';
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}
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// GIF
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if (buffer.slice(0, 6).toString() === 'GIF87a' || buffer.slice(0, 6).toString() === 'GIF89a') {
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return 'image/gif';
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}
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// PDF
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if (buffer.slice(0, 4).toString() === '%PDF') {
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return 'application/pdf';
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}
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// ZIP
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if (buffer[0] === 0x50 && buffer[1] === 0x4B && (buffer[2] === 0x03 || buffer[2] === 0x05 || buffer[2] === 0x07) && (buffer[3] === 0x04 || buffer[3] === 0x06 || buffer[3] === 0x08)) {
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return 'application/zip';
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}
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// GZIP
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if (buffer[0] === 0x1F && buffer[1] === 0x8B) {
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return 'application/gzip';
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}
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// MP3
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if ((buffer[0] === 0x49 && buffer[1] === 0x44 && buffer[2] === 0x33) || (buffer[0] === 0xFF && (buffer[1] & 0xE0) === 0xE0)) {
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return 'audio/mpeg';
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}
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// WAV
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if (buffer.slice(0, 4).toString() === 'RIFF' && buffer.slice(8, 12).toString() === 'WAVE') {
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return 'audio/wav';
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}
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// WebP
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if (buffer.slice(0, 4).toString() === 'RIFF' && buffer.slice(8, 12).toString() === 'WEBP') {
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return 'image/webp';
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}
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// BMP
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if (buffer[0] === 0x42 && buffer[1] === 0x4D) {
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return 'image/bmp';
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}
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// OGG
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if (buffer.slice(0, 4).toString() === 'OggS') {
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return 'application/ogg';
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}
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// MIDI
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if (buffer.slice(0, 4).toString() === 'MThd') {
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return 'audio/midi';
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}
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// TAR
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if (buffer.length > 257 && buffer.slice(257, 262).toString() === 'ustar') {
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return 'application/x-tar';
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}
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// TEXT (plain)
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if (
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buffer.length >= 4 &&
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(
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buffer.slice(0, 5).toString().toLowerCase() === '<?xml' ||
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buffer.slice(0, 6).toString().toLowerCase() === '<html>' ||
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buffer.slice(0, 6).toString().toLowerCase() === '<!doc' ||
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buffer.slice(0, 6).toString().toLowerCase() === '<head>' ||
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buffer.slice(0, 6).toString().toLowerCase() === '<body>' ||
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buffer.slice(0, 6).toString().toLowerCase() === '<meta>' ||
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buffer.slice(0, 6).toString().toLowerCase() === '<titl>' ||
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buffer.slice(0, 6).toString().toLowerCase() === '<scri>' ||
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buffer.slice(0, 6).toString().toLowerCase() === '<styl>'
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)
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) {
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return 'text/html';
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}
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// Try to detect plain text (no null bytes, mostly printable)
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if (
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buffer.length > 0 &&
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buffer.slice(0, 512).every(b => (b === 0x09 || b === 0x0A || b === 0x0D || (b >= 0x20 && b <= 0x7E)))
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) {
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return 'text/plain';
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}
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// Default fallback
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return 'application/octet-stream';
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}
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// modified from https://github.com/sergi/mime-multipart/blob/master/index.js
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generateMultipartMIME(tuples, options) {
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// modified for creating usenet compliant headers/content from an attachment
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const CRLF = '\n';
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if (tuples.length === 0) {
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// according to rfc1341 there should be at least one encapsulation
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throw new Error('Missing argument. At least one part to generate is required');
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}
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options = options || {};
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const preamble = options.preamble || "This is a multi-part message in MIME format.";
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const epilogue = options.epilogue;
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const boundary = options.boundary || "------------" + this.wtvshared.generateString(24);
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if (boundary.length < 1 || boundary.length > 70) {
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throw new Error('Boundary should be between 1 and 70 characters long');
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}
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const boundary_header = 'multipart/mixed; boundary="' + boundary + '"';
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const delimiter = CRLF + '--' + boundary;
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const closeDelimiter = delimiter + '--';
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const encapsulations = tuples.map(function (tuple, i) {
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const mimetype = tuple.mime || 'text/plain';
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const encoding = tuple.encoding || 'utf-8';
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const use_base64 = tuple.use_base64 || !this.wtvshared.isASCII(tuple.content);
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const is_base64 = tuple.is_base64 || this.wtvshared.isBase64(tuple.content);
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const filename = (tuple.filename) ? tuple.filename : (use_base64) ? ('file' + i) : null;
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const headers = [
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`Content-Type: ${mimetype}; ${(use_base64) ? `name="${filename}"` : `charset=${encoding.toUpperCase()}; format=flowed`}`,
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];
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if (filename) headers.push(`Content-Disposition: attachment; filename="${filename}"`);
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headers.push(`Content-Transfer-Encoding: ${(use_base64) ? 'base64' : '7bit'}`);
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let bodyPart = headers.join(CRLF) + CRLF + CRLF;
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if (use_base64 && !is_base64) bodyPart += this.wtvshared.lineWrap(Buffer.from(tuple.content).toString('base64'),72) + CRLF;
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else bodyPart += this.wtvshared.lineWrap(tuple.content,72);
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return delimiter + CRLF + bodyPart;
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});
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const multipartBody = [
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preamble ? preamble : undefined,
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encapsulations.join(''),
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closeDelimiter,
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epilogue ? CRLF + epilogue : undefined,
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].filter(function (element) { return !!element; });
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return {
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"mime_version": "1.0",
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"content_type": boundary_header,
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"content": multipartBody.join('')
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};
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}
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}
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module.exports = WTVMime;
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