base64辅助类

2020-07-17 15:40:28 +08:00
parent c96e8b3a04
commit dccd4e21b6
7 changed files with 390 additions and 2 deletions
--- a/source/src/Utils/Base64Utils.ts
+++ b/source/src/Utils/Base64Utils.ts
@@ -0,0 +1,124 @@
+class Base64Utils {
+    private static _keyNum = "0123456789+/";
+    private static _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+    private static _keyAll = Base64Utils._keyNum + Base64Utils._keyStr;
+    /**
+     * 加密
+     * @param input 
+     */
+    public static encode = function (input) {
+        let output = "";
+        let chr1, chr2, chr3, enc1, enc2, enc3, enc4;
+        let i = 0;
+        input = this._utf8_encode(input);
+        while (i < input.length) {
+            chr1 = input.charCodeAt(i++);
+            chr2 = input.charCodeAt(i++);
+            chr3 = input.charCodeAt(i++);
+            enc1 = chr1 >> 2;
+            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
+            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
+            enc4 = chr3 & 63;
+            if (isNaN(chr2)) {
+                enc3 = enc4 = 64;
+            } else if (isNaN(chr3)) {
+                enc4 = 64;
+            }
+            output = output +
+                this._keyAll.charAt(enc1) + this._keyAll.charAt(enc2) +
+                this._keyAll.charAt(enc3) + this._keyAll.charAt(enc4);
+        }
+        return this._keyStr.charAt(Math.floor((Math.random() * this._keyStr.length))) + output;
+    }
+
+    private static _utf8_encode(string) {
+        string = string.replace(/\r\n/g, "\n");
+        let utftext = "";
+        for (let n = 0; n < string.length; n++) {
+            let c = string.charCodeAt(n);
+            if (c < 128) {
+                utftext += String.fromCharCode(c);
+            } else if ((c > 127) && (c < 2048)) {
+                utftext += String.fromCharCode((c >> 6) | 192);
+                utftext += String.fromCharCode((c & 63) | 128);
+            } else {
+                utftext += String.fromCharCode((c >> 12) | 224);
+                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
+                utftext += String.fromCharCode((c & 63) | 128);
+            }
+
+        }
+        return utftext;
+    }
+
+    /**
+     * 解码
+     * @param input 
+     * @param isNotStr 
+     */
+    public static decode(input, isNotStr: boolean = true) {
+        let output = "";
+        let chr1, chr2, chr3;
+        let enc1, enc2, enc3, enc4;
+        let i = 0;
+        input = this.getConfKey(input);
+        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
+        while (i < input.length) {
+            enc1 = this._keyAll.indexOf(input.charAt(i++));
+            enc2 = this._keyAll.indexOf(input.charAt(i++));
+            enc3 = this._keyAll.indexOf(input.charAt(i++));
+            enc4 = this._keyAll.indexOf(input.charAt(i++));
+            chr1 = (enc1 << 2) | (enc2 >> 4);
+            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
+            chr3 = ((enc3 & 3) << 6) | enc4;
+            output = output + String.fromCharCode(chr1);
+            if (enc3 != 64) {
+                if (chr2 == 0) {
+                    if (isNotStr) output = output + String.fromCharCode(chr2);
+                } else {
+                    output = output + String.fromCharCode(chr2);
+                }
+            }
+
+            if (enc4 != 64) {
+                if (chr3 == 0) {
+                    if (isNotStr) output = output + String.fromCharCode(chr3);
+                } else {
+                    output = output + String.fromCharCode(chr3);
+                }
+            }
+        }
+        output = this._utf8_decode(output);
+        return output;
+    }
+
+    private static _utf8_decode(utftext) {
+        let string = "";
+        let i = 0;
+        let c = 0;
+        let c1 = 0;
+        let c2 = 0;
+        let c3 = 0;
+        while (i < utftext.length) {
+            c = utftext.charCodeAt(i);
+            if (c < 128) {
+                string += String.fromCharCode(c);
+                i++;
+            } else if ((c > 191) && (c < 224)) {
+                c2 = utftext.charCodeAt(i + 1);
+                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
+                i += 2;
+            } else {
+                c2 = utftext.charCodeAt(i + 1);
+                c3 = utftext.charCodeAt(i + 2);
+                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
+                i += 3;
+            }
+        }
+        return string;
+    }
+
+    private static getConfKey(key): string {
+        return key.slice(1, key.length);
+    }
+}