Улучшение FileDetector

server/core/FileDetector.js

@@ -1,57 +1,274 @@
-const detect = require('detect-file-type');
-
-//html
-detect.addSignature(
-  {
-    "type": "html",
-    "ext": "html",
-    "mime": "text/html",
-    "rules": [
-      { "type": "or", "rules":
-      [
-        { "type": "equal", "end": 5, "bytes": "3c68746d6c" },
-        { "type": "equal", "end": 10, "bytes": "3c00680074006d006c00" },
-
-        { "type": "equal", "end": 9, "bytes": "3c21646f6374797065" },
-        { "type": "equal", "end": 5, "bytes": "3c626f6479" },
-        { "type": "equal", "end": 5, "bytes": "3c68656164" },
-        { "type": "equal", "end": 7, "bytes": "3c696672616d65" },
-        { "type": "equal", "end": 4, "bytes": "3c696d67" },
-        { "type": "equal", "end": 7, "bytes": "3c6f626a656374" },
-        { "type": "equal", "end": 7, "bytes": "3c736372697074" },
-        { "type": "equal", "end": 6, "bytes": "3c7461626c65" },
-        { "type": "equal", "end": 6, "bytes": "3c7469746c65" },
-      ]
-      }
-    ]
-  }
-);
-
-//xml 3c 3f 78 6d 6c 20 76 65 72 73 69 6f 6e 3d 22 31 2e 30 22
-detect.addSignature(
-  {
-    "type": "xml",
-    "ext": "xml",
-    "mime": "application/xml",
-    "rules": [
-      { "type": "or", "rules":
-      [
-        { "type": "equal", "end": 19, "bytes": "3c3f786d6c2076657273696f6e3d22312e3022" },
-      ]
-      }
-    ]
-  }
-);
+const fs = require('fs');
+const signatures = require('./signatures.json');
 
 class FileDetector {
     detectFile(filename) {
         return new Promise((resolve, reject) => {
-            detect.fromFile(filename, (err, result) => {
+            this.fromFile(filename, (err, result) => {
                 if (err) reject(err);
                 resolve(result);
             });
         });
     }
+
+    //все, что ниже, взято здесь: https://github.com/dimapaloskin/detect-file-type
+    fromFile(filePath, bufferLength, callback) {
+        if (typeof bufferLength === 'function') {
+            callback = bufferLength;
+            bufferLength = undefined;
+        }
+
+        this.getFileSize(filePath, (err, fileSize) => {
+            if (err) {
+                return callback(err);
+            }
+
+            fs.open(filePath, 'r', (err, fd) => {
+                if (err) {
+                    return callback(err);
+                }
+
+                let bufferSize = bufferLength;
+                if (!bufferSize) {
+                    bufferSize = 500;
+                }
+
+                if (fileSize < bufferSize) {
+                    bufferSize = fileSize;
+                }
+
+                const buffer = Buffer.alloc(bufferSize);
+
+                fs.read(fd, buffer, 0, bufferSize, 0, (err) => {
+                    fs.close(fd);
+
+                    if (err) {
+                      return callback(err);
+                    }
+
+                    this.fromBuffer(buffer, callback);
+                });
+            });
+        });
+    }
+
+    fromBuffer(buffer, callback) {
+        let result = null;
+
+        const invalidSignaturesList = this.validateSigantures();
+        if (invalidSignaturesList.length) {
+            return callback(invalidSignaturesList);
+        }
+
+        signatures.every((signature) => {
+            if (this.detect(buffer, signature.rules)) {
+                result = {
+                    ext: signature.ext,
+                    mime: signature.mime
+                };
+
+                if (signature.iana)
+                    result.iana = signature.iana;
+
+                return false;
+            }
+            return true;
+        });
+
+        callback(null, result);
+    }
+
+    detect(buffer, receivedRules, type) {
+        if (!type) {
+            type = 'and';
+        }
+
+        const rules = [...receivedRules];
+
+        let isDetected = true;
+        rules.every((rule) => {
+            if (rule.type === 'equal') {
+                const slicedHex = buffer.slice(rule.start || 0, rule.end || buffer.length).toString('hex');
+                isDetected = (slicedHex === rule.bytes);
+                return this.isReturnFalse(isDetected, type);
+            }
+
+            if (rule.type === 'notEqual') {
+                const slicedHex = buffer.slice(rule.start || 0, rule.end || buffer.length).toString('hex');
+                isDetected = !(slicedHex === rule.bytes);
+                return this.isReturnFalse(isDetected, type);
+            }
+
+            if (rule.type === 'contains') {
+                const slicedHex = buffer.slice(rule.start || 0, rule.end || buffer.length).toString('hex');
+                if (typeof rule.bytes === 'string') {
+                    rule.bytes = [rule.bytes];
+                }
+
+                rule.bytes.every((bytes) => {
+                    isDetected = (slicedHex.indexOf(bytes) !== -1);
+                    return isDetected;
+                });
+
+                return this.isReturnFalse(isDetected, type);
+            }
+
+            if (rule.type === 'notContains') {
+                const slicedHex = buffer.slice(rule.start || 0, rule.end || buffer.length).toString('hex');
+                if (typeof rule.bytes === 'string') {
+                    rule.bytes = [rule.bytes];
+                }
+
+                rule.bytes.every((bytes) => {
+                    isDetected = (slicedHex.indexOf(bytes) === -1);
+                    return isDetected;
+                });
+
+                return this.isReturnFalse(isDetected, type);
+            }
+
+            if (rule.type === 'or') {
+                isDetected = this.detect(buffer, rule.rules, 'or');
+                return this.isReturnFalse(isDetected, type);
+            }
+
+            if (rule.type === 'and') {
+                isDetected = this.detect(buffer, rule.rules, 'and');
+                return this.isReturnFalse(isDetected, type);
+            }
+
+            return true;
+        });
+
+        return isDetected;
+    }
+
+    isReturnFalse(isDetected, type) {
+        if (!isDetected && type === 'and') {
+            return false;
+        }
+
+        if (isDetected && type === 'or') {
+            return false;
+        }
+
+        return true;
+    }
+
+    validateRuleType(rule) {
+        const types = ['or', 'and', 'contains', 'notContains', 'equal', 'notEqual'];
+        return  (types.indexOf(rule.type) !== -1);
+    }
+
+    validateSigantures() {
+        let invalidSignatures = signatures.map((signature) => {
+            return this.validateSignature(signature);
+        });
+
+        invalidSignatures = this.cleanArray(invalidSignatures);
+
+        if (invalidSignatures.length) {
+            return invalidSignatures;
+        }
+
+        return true;
+    }
+
+    validateSignature(signature) {
+        if (!('type' in signature)) {
+            return {
+                message: 'signature does not contain "type" field',
+                signature
+            };
+        }
+
+        if (!('ext' in signature)) {
+            return {
+                message: 'signature does not contain "ext" field',
+                signature
+            };
+        }
+
+        if (!('mime' in signature)) {
+            return {
+                message: 'signature does not contain "mime" field',
+                signature
+            };
+        }
+
+        if (!('rules' in signature)) {
+            return {
+                message: 'signature does not contain "rules" field',
+                signature
+            };
+        }
+
+        const invalidRules = this.validateRules(signature.rules);
+
+        if (invalidRules && invalidRules.length) {
+            return {
+                message: 'signature has invalid rule',
+                signature,
+                rules: invalidRules
+            }
+        }
+    }
+
+    validateRules(rules) {
+        let invalidRules = rules.map((rule) => {
+            let isRuleTypeValid = this.validateRuleType(rule);
+
+            if (!isRuleTypeValid) {
+                return {
+                    message: 'rule type does not supported',
+                    rule
+                };
+            }
+
+            if ((rule.type === 'or' || rule.type === 'and') && !('rules' in rule)) {
+                return {
+                    message: 'rule should contains "rules" field',
+                    rule
+                };
+            }
+
+            if (rule.type === 'or' || rule.type === 'and') {
+                return this.validateRules(rule.rules);
+            }
+
+            return false;
+        });
+
+        invalidRules = this.cleanArray(invalidRules);
+
+        if (invalidRules.length) {
+            return invalidRules;
+        }
+    }
+
+    cleanArray(actual) {
+        let newArray = new Array();
+        for (let i = 0; i < actual.length; i++) {
+            if (actual[i]) {
+                newArray.push(actual[i]);
+            }
+        }
+        return newArray;
+    }
+
+    addSignature(signature) {
+        signatures.push(signature);
+    }
+
+    getFileSize(filePath, callback) {
+        fs.stat(filePath, (err, stat) => {
+            if (err) {
+                return callback(err);
+            }
+
+            return callback(null, stat.size);
+        });
+    }
 }
 
 module.exports = FileDetector;

server/core/signatures.json

@@ -0,0 +1,726 @@
+[
+  {
+    "type": "xml",
+    "ext": "xml",
+    "mime": "application/xml",
+    "rules": [
+      { "type": "or", "rules":
+      [
+        { "type": "equal", "end": 19, "bytes": "3c3f786d6c2076657273696f6e3d22312e3022" }
+      ]
+      }
+    ]
+  },
+
+  {
+    "type": "docx",
+    "ext": "docx",
+    "mime": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+    "rules": [
+      { "type": "or", "rules":
+      [
+        { "type": "equal", "end": 4, "bytes": "504b0304" }
+      ]
+      }
+    ]
+  },
+
+  {
+    "type": "jpg",
+    "ext": "jpg",
+    "mime": "image/jpeg",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 2, "bytes": "ffd8"  }
+    ]
+  },
+
+  {
+    "type": "png",
+    "ext": "png",
+    "mime": "image/png",
+    "rules": [
+      { "type": "equal", "start": 0,"end": 4, "bytes": "89504e47" }
+    ]
+  },
+
+  {
+    "type": "gif",
+    "ext": "gif",
+    "mime": "image/gif",
+    "rules": [
+      { "type": "equal", "start": 0,"end": 3, "bytes": "474946" }
+    ]
+  },
+
+  {
+    "type": "bmp",
+    "ext": "bmp",
+    "mime": "image/bmp",
+    "rules": [
+      { "type": "equal", "start": 0,"end": 2, "bytes": "424d" }
+    ]
+  },
+  {
+    "type": "webp",
+    "ext": "webp",
+    "mime": "image/webp",
+    "rules": [
+      { "type": "equal", "start": 8,"end": 12, "bytes": "57454250" }
+    ]
+  },
+
+  {
+    "type": "tif",
+    "ext": "tif",
+    "mime": "image/tiff",
+    "rules": [
+      { "type": "and", "rules":
+        [
+          { "type": "or", "rules":
+            [
+              { "type": "equal", "start": 0, "end": 4, "bytes": "49492a00" },
+              { "type": "equal", "start": 0, "end": 4,  "bytes": "4d4d002a" }
+            ]
+          },
+          { "type": "notEqual", "start": 8, "end": 10, "bytes": "4352" }
+        ]
+      }
+    ]
+  },
+
+  {
+    "type": "cr2",
+    "ext": "cr2",
+    "mime": "image/x-canon-cr2",
+    "rules": [
+      { "type": "and", "rules":
+        [
+          { "type": "or", "rules":
+            [
+              { "type": "equal", "start": 0, "end": 4, "bytes": "49492a00" },
+              { "type": "equal", "start": 0, "end": 4,  "bytes": "4d4d002a" }
+            ]
+          },
+          { "type": "equal", "start": 8, "end": 10, "bytes": "4352" }
+        ]
+      }
+    ]
+  },
+
+  {
+    "type": "jxr",
+    "ext": "jxr",
+    "mime": "image/vnd.ms-photo",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 3, "bytes": "4949bc" }
+    ]
+  },
+
+  {
+    "type": "psd",
+    "ext": "psd",
+    "mime": "image/vnd.adobe.photoshop",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 4, "bytes": "38425053" }
+    ]
+  },
+
+  {
+    "type": "flif",
+    "ext": "flif",
+    "mime": "image/flif",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 4, "bytes": "464c4946" }
+    ]
+  },
+
+  {
+    "type": "zip",
+    "ext": "zip",
+    "mime": "application/zip",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 2, "bytes": "504b" },
+      { "type": "or", "rules":
+        [
+          { "type": "equal", "start": 2, "end": 3, "bytes": "03" },
+          { "type": "equal", "start": 2, "end": 3, "bytes": "05" },
+          { "type": "equal", "start": 2, "end": 3, "bytes": "07" }
+        ]
+      },
+      { "type": "or", "rules":
+        [
+          { "type": "equal", "start": 3, "end": 4, "bytes": "04" },
+          { "type": "equal", "start": 3, "end": 4, "bytes": "06" },
+          { "type": "equal", "start": 3, "end": 4, "bytes": "08" }
+        ]
+      },
+      { "type": "notEqual", "start": 36, "end": 58, "bytes": "70656170706c69636174696f6e2f657075622b7a6970" },
+      { "type": "notEqual", "start": 30, "end": 50, "bytes": "4d4554412d494e462f6d6f7a696c6c612e727361" }
+    ]
+  },
+
+  {
+    "type": "epub",
+    "ext": "epub",
+    "mime": "application/epub+zip",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 4, "bytes": "504b0304" },
+      { "type": "equal", "start": 36, "end": 58, "bytes": "70656170706c69636174696f6e2f657075622b7a6970" }
+    ]
+  },
+
+  {
+    "type": "xpi",
+    "ext": "xpi",
+    "mime": "application/x-xpinstall",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 4, "bytes": "504b0304" },
+      { "type": "equal", "start": 30, "end": 50, "bytes": "4d4554412d494e462f6d6f7a696c6c612e727361" }
+    ]
+  },
+
+  {
+    "type": "tar",
+    "ext": "tar",
+    "mime": "application/x-tar",
+    "rules": [
+      { "type": "equal", "start": 257, "end": 262, "bytes": "7573746172" }
+    ]
+  },
+  {
+    "type": "rar",
+    "ext": "rar",
+    "mime": "application/x-rar-compressed",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 6, "bytes": "526172211a07" },
+      { "type": "or", "rules":
+        [
+          { "type": "equal", "start": 6, "end": 7, "bytes": "00" },
+          { "type": "equal", "start": 6, "end": 7, "bytes": "01" }
+        ]
+      }
+    ]
+  },
+  {
+    "type": "gz",
+    "ext": "gz",
+    "mime": "application/gzip",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 3, "bytes": "1f8b08" }
+    ]
+  },
+  {
+    "type": "bz2",
+    "ext": "bz2",
+    "mime": "application/x-bzip2",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 3, "bytes": "425a68" }
+    ]
+  },
+  {
+    "type": "7z",
+    "ext": "7z",
+    "mime": "application/x-7z-compressed",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 6, "bytes": "377abcaf271c" }
+    ]
+  },
+  {
+    "type": "dmg",
+    "ext": "dmg",
+    "mime": "application/x-apple-diskimage",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 2, "bytes": "7801" }
+    ]
+  },
+
+  {
+    "type": "mp4",
+    "ext": "mp4",
+    "mime": "video/mp4",
+    "rules": [
+      { "type": "or", "rules":
+        [
+          { "type": "and", "rules":
+            [
+              { "type": "equal", "start": 0, "end": 3, "bytes": "000000" },
+              { "type": "or", "rules":
+                [
+                  { "type": "equal", "start": 3, "end": 4, "bytes": "18" },
+                  { "type": "equal", "start": 3, "end": 4, "bytes": "20" }
+                ]
+              },
+              { "type": "equal", "start": 4, "end": 8, "bytes": "66747970" }
+            ]
+          },
+          { "type": "equal", "start": 0, "end": 4, "bytes": "33677035" },
+          { "type": "and", "rules":
+            [
+              { "type": "equal", "start": 0, "end": 11, "bytes": "0000001c667479706d7034" },
+              { "type": "equal", "start": 16, "end": 28, "bytes": "6d7034316d70343269736f6d" }
+            ]
+          },
+          { "type": "equal", "start": 0, "end": 12, "bytes": "0000001c6674797069736f6d" },
+          { "type": "equal", "start": 0, "end": 16, "bytes": "0000001c667479706d70343200000000" }
+        ]
+      }
+    ]
+  },
+
+  {
+    "type": "m4v",
+    "ext": "m4v",
+    "mime": "video/x-m4v",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 11, "bytes": "0000001c667479704d3456" }
+    ]
+  },
+
+  {
+    "type": "mid",
+    "ext": "mid",
+    "mime": "audio/midi",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 4, "bytes": "4d546864" }
+    ]
+  },
+
+  {
+    "type": "mkv",
+    "ext": "mkv",
+    "mime": "video/x-matroska",
+    "rules": [
+      { "type": "equal", "start": 31, "end": 39, "bytes": "6d6174726f736b61" }
+    ]
+  },
+
+  {
+    "type": "webm",
+    "ext": "webm",
+    "mime": "video/webm",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 4, "bytes": "1a45dfa3" },
+      { "type": "notEqual", "start": 31, "end": 39, "bytes": "6d6174726f736b61" }
+    ]
+  },
+
+  {
+    "type": "wmv",
+    "ext": "wmv",
+    "mime": "video/x-ms-wmv",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 10, "bytes": "3026b2758e66cf11a6d9" }
+    ]
+  },
+
+  {
+    "type": "mpg",
+    "ext": "mpg",
+    "mime": "video/mpeg",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 3, "bytes": "000001" },
+      { "type": "or", "rules":
+        [
+          { "type": "equal", "start": 3, "end": 4, "bytes": "b0"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "b1"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "b2"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "b3"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "b4"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "b5"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "b6"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "b7"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "b8"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "b9"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "ba"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "bb"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "bc"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "bd"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "be"},
+          { "type": "equal", "start": 3, "end": 4, "bytes": "bf"}
+        ]
+      }
+    ]
+  },
+
+  {
+    "type": "mp3",
+    "ext": "mp3",
+    "mime": "audio/mpeg",
+    "rules": [
+      { "type": "or", "rules":
+        [
+          { "type": "equal", "start": 0, "end": 3, "bytes": "494433" },
+          { "type": "equal", "start": 0, "end": 2, "bytes": "fffb" }
+        ]
+      }
+    ]
+  },
+
+  {
+    "type": "m4a",
+    "ext": "m4a",
+    "mime": "audio/m4a",
+    "rules": [
+      { "type": "or", "rules":
+        [
+          { "type": "equal", "start": 4, "end": 11, "bytes": "667479704d3441" },
+          { "type": "equal", "start": 0, "end": 4, "bytes": "4d344120" }
+        ]
+      }
+    ]
+  },
+
+  {
+    "type": "opus",
+    "ext": "opus",
+    "mime": "audio/opus",
+    "rules": [
+      { "type": "equal", "start": 28, "end": 36, "bytes": "4f70757348656164" }
+    ]
+  },
+
+  {
+    "type": "ogg",
+    "ext": "ogg",
+    "mime": "audio/ogg",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 4, "bytes": "4f676753" },
+      { "type": "notEqual", "start": 28, "end": 36, "bytes": "4f70757348656164" }
+    ]
+  },
+
+  {
+    "type": "flac",
+    "ext": "flac",
+    "mime": "audio/x-flac",
+    "rules": [
+      { "type": "equal", "start": 0, "end": 4, "bytes": "664c6143" }
+    ]
+  },
+
+  {
+    "type": "wav",
+    "ext": "wav",
+    "mime": "audio/x-wav",
+    "rules": [
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