feat: 支持base64图片链接
This commit is contained in:
0JARVIS0
parent
9f808fb67a
commit
d66de88556
@ -3,6 +3,7 @@
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* 详细设计文档可查看 https://juejin.im/post/5b42d3ede51d4519277b6ce3
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*/
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const util = require('./util');
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const hash = require('./hash');
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const SAVED_FILES_KEY = 'savedFiles';
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const KEY_TOTAL_SIZE = 'totalSize';
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@ -40,25 +41,34 @@ export default class Dowloader {
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resolve(url);
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return;
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}
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const fileName = getFileName(url);
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if (!lru) {
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// 无 lru 情况下直接判断 临时文件是否存在，不存在重新下载
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wx.getFileInfo({
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filePath: url,
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filePath: fileName,
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success: () => {
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resolve(url);
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},
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fail: () => {
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downloadFile(url, lru).then((path) => {
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if (util.isOnlineUrl(url)) {
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downloadFile(url, lru).then(path => {
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resolve(path);
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}, () => {
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reject();
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});
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} else if (util.isDataUrl(url)) {
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transformBase64File(url, lru).then(path => {
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resolve(path);
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}, () => {
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reject();
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});
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}
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},
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})
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return
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}
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const file = getFile(url);
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const file = getFile(fileName);
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if (file) {
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// 检查文件是否正常，不正常需要重新下载
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@ -77,16 +87,70 @@ export default class Dowloader {
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},
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});
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} else {
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downloadFile(url, lru).then((path) => {
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if (util.isOnlineUrl(url)) {
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downloadFile(url, lru).then(path => {
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resolve(path);
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}, () => {
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reject();
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});
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} else if (util.isDataUrl(url)) {
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transformBase64File(url, lru).then(path => {
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resolve(path);
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}, () => {
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reject();
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});
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}
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}
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});
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}
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}
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function getFileName(url) {
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if (util.isDataUrl(url)) {
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const [, format, bodyData] = /data:image\/(\w+);base64,(.*)/.exec(base64data) || [];
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const fileName = `${hash.sha256(bodyData)}.${format}`;
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return fileName;
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} else {
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return url;
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}
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}
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function transformBase64File(base64data, lru) {
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return new Promise((resolve, reject) => {
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const [, format, bodyData] = /data:image\/(\w+);base64,(.*)/.exec(base64data) || [];
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if (!format) {
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console.error('base parse failed');
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reject()
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}
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const fileName = `${hash.sha256(bodyData)}.${format}`;
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const path = `${wx.env.USER_DATA_PATH}/${fileName}`;
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const buffer = wx.base64ToArrayBuffer(bodyData.replace(/[\r\n]/g, ""));
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const result = wx.getFileSystemManager().writeFileSync(path, buffer, 'binary');
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if (!result) {
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wx.getFileInfo({
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filePath: path,
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success: (tmpRes) => {
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const newFileSize = tmpRes.size;
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lru ? doLru(newFileSize).then(() => {
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saveFile(fileName, newFileSize, path).then((filePath) => {
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resolve(filePath);
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});
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}, () => {
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resolve(path);
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}) : resolve(path);
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},
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fail: (error) => {
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// 文件大小信息获取失败，则此文件也不要进行存储
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console.error(`getFileInfo ${path} failed, ${JSON.stringify(error)}`);
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resolve(path);
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},
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});
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} else {
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reject()
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}
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});
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}
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function downloadFile(url, lru) {
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return new Promise((resolve, reject) => {
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wx.downloadFile({
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255
lib/hash.js
Normal file
255
lib/hash.js
Normal file
@ -0,0 +1,255 @@
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/* SHA256 logical functions */
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function rotateRight(n, x) {
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return (x >>> n) | (x << (32 - n));
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}
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function choice(x, y, z) {
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return (x & y) ^ (~x & z);
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}
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function majority(x, y, z) {
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return (x & y) ^ (x & z) ^ (y & z);
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}
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function sha256_Sigma0(x) {
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return rotateRight(2, x) ^ rotateRight(13, x) ^ rotateRight(22, x);
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}
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function sha256_Sigma1(x) {
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return rotateRight(6, x) ^ rotateRight(11, x) ^ rotateRight(25, x);
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}
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function sha256_sigma0(x) {
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return rotateRight(7, x) ^ rotateRight(18, x) ^ (x >>> 3);
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}
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function sha256_sigma1(x) {
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return rotateRight(17, x) ^ rotateRight(19, x) ^ (x >>> 10);
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}
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function sha256_expand(W, j) {
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return (W[j & 0x0f] +=
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sha256_sigma1(W[(j + 14) & 0x0f]) +
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W[(j + 9) & 0x0f] +
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sha256_sigma0(W[(j + 1) & 0x0f]));
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}
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/* Hash constant words K: */
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var K256 = new Array(
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0x428a2f98,
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0x71374491,
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0xb5c0fbcf,
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0xe9b5dba5,
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0x3956c25b,
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0x59f111f1,
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0x923f82a4,
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0xab1c5ed5,
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0xd807aa98,
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0x12835b01,
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0x243185be,
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0x550c7dc3,
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0x72be5d74,
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0x80deb1fe,
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0x9bdc06a7,
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0xc19bf174,
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0xe49b69c1,
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0xefbe4786,
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0x0fc19dc6,
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0x240ca1cc,
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0x2de92c6f,
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0x4a7484aa,
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0x5cb0a9dc,
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0x76f988da,
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0x983e5152,
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0xa831c66d,
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0xb00327c8,
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0xbf597fc7,
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0xc6e00bf3,
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0xd5a79147,
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0x06ca6351,
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0x14292967,
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0x27b70a85,
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0x2e1b2138,
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0x4d2c6dfc,
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0x53380d13,
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0x650a7354,
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0x766a0abb,
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0x81c2c92e,
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0x92722c85,
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0xa2bfe8a1,
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0xa81a664b,
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0xc24b8b70,
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0xc76c51a3,
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0xd192e819,
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0xd6990624,
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0xf40e3585,
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0x106aa070,
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0x19a4c116,
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0x1e376c08,
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0x2748774c,
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0x34b0bcb5,
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0x391c0cb3,
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0x4ed8aa4a,
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0x5b9cca4f,
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0x682e6ff3,
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0x748f82ee,
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0x78a5636f,
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0x84c87814,
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0x8cc70208,
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0x90befffa,
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0xa4506ceb,
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0xbef9a3f7,
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0xc67178f2
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);
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/* global arrays */
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var ihash, count, buffer;
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var sha256_hex_digits = "0123456789abcdef";
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/* Add 32-bit integers with 16-bit operations (bug in some JS-interpreters:
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overflow) */
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function safe_add(x, y) {
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var lsw = (x & 0xffff) + (y & 0xffff);
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var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
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return (msw << 16) | (lsw & 0xffff);
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}
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/* Initialise the SHA256 computation */
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function sha256_init() {
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ihash = new Array(8);
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count = new Array(2);
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buffer = new Array(64);
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count[0] = count[1] = 0;
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ihash[0] = 0x6a09e667;
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ihash[1] = 0xbb67ae85;
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ihash[2] = 0x3c6ef372;
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ihash[3] = 0xa54ff53a;
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ihash[4] = 0x510e527f;
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ihash[5] = 0x9b05688c;
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ihash[6] = 0x1f83d9ab;
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ihash[7] = 0x5be0cd19;
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}
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/* Transform a 512-bit message block */
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function sha256_transform() {
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var a, b, c, d, e, f, g, h, T1, T2;
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var W = new Array(16);
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/* Initialize registers with the previous intermediate value */
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a = ihash[0];
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b = ihash[1];
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c = ihash[2];
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d = ihash[3];
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e = ihash[4];
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f = ihash[5];
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g = ihash[6];
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h = ihash[7];
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/* make 32-bit words */
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for (var i = 0; i < 16; i++)
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W[i] =
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buffer[(i << 2) + 3] |
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(buffer[(i << 2) + 2] << 8) |
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(buffer[(i << 2) + 1] << 16) |
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(buffer[i << 2] << 24);
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for (var j = 0; j < 64; j++) {
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T1 = h + sha256_Sigma1(e) + choice(e, f, g) + K256[j];
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if (j < 16) T1 += W[j];
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else T1 += sha256_expand(W, j);
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T2 = sha256_Sigma0(a) + majority(a, b, c);
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h = g;
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g = f;
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f = e;
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e = safe_add(d, T1);
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d = c;
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c = b;
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b = a;
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a = safe_add(T1, T2);
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}
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/* Compute the current intermediate hash value */
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ihash[0] += a;
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ihash[1] += b;
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ihash[2] += c;
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ihash[3] += d;
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ihash[4] += e;
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ihash[5] += f;
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ihash[6] += g;
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ihash[7] += h;
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}
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/* Read the next chunk of data and update the SHA256 computation */
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function sha256_update(data, inputLen) {
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var i,
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index,
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curpos = 0;
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/* Compute number of bytes mod 64 */
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index = (count[0] >> 3) & 0x3f;
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var remainder = inputLen & 0x3f;
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/* Update number of bits */
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if ((count[0] += inputLen << 3) < inputLen << 3) count[1]++;
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count[1] += inputLen >> 29;
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/* Transform as many times as possible */
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for (i = 0; i + 63 < inputLen; i += 64) {
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for (var j = index; j < 64; j++) buffer[j] = data.charCodeAt(curpos++);
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sha256_transform();
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index = 0;
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}
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/* Buffer remaining input */
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for (var j = 0; j < remainder; j++) buffer[j] = data.charCodeAt(curpos++);
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}
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/* Finish the computation by operations such as padding */
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function sha256_final() {
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var index = (count[0] >> 3) & 0x3f;
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buffer[index++] = 0x80;
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if (index <= 56) {
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for (var i = index; i < 56; i++) buffer[i] = 0;
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} else {
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for (var i = index; i < 64; i++) buffer[i] = 0;
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sha256_transform();
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for (var i = 0; i < 56; i++) buffer[i] = 0;
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}
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buffer[56] = (count[1] >>> 24) & 0xff;
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buffer[57] = (count[1] >>> 16) & 0xff;
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buffer[58] = (count[1] >>> 8) & 0xff;
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buffer[59] = count[1] & 0xff;
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buffer[60] = (count[0] >>> 24) & 0xff;
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buffer[61] = (count[0] >>> 16) & 0xff;
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buffer[62] = (count[0] >>> 8) & 0xff;
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buffer[63] = count[0] & 0xff;
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sha256_transform();
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}
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/* Split the internal hash values into an array of bytes */
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function sha256_encode_bytes() {
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var j = 0;
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var output = new Array(32);
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for (var i = 0; i < 8; i++) {
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output[j++] = (ihash[i] >>> 24) & 0xff;
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output[j++] = (ihash[i] >>> 16) & 0xff;
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output[j++] = (ihash[i] >>> 8) & 0xff;
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output[j++] = ihash[i] & 0xff;
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}
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return output;
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}
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/* Get the internal hash as a hex string */
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function sha256_encode_hex() {
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var output = new String();
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for (var i = 0; i < 8; i++) {
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for (var j = 28; j >= 0; j -= 4)
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output += sha256_hex_digits.charAt((ihash[i] >>> j) & 0x0f);
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}
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return output;
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}
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/* Main function: returns a hex string representing the SHA256 value of the
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given data */
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function sha256_digest(data) {
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sha256_init();
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sha256_update(data, data.length);
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sha256_final();
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return sha256_encode_hex();
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}
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module.exports = {
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sha256: sha256_digest
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}
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12
lib/util.js
12
lib/util.js
@ -1,6 +1,14 @@
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function isValidUrl(url) {
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return /(ht|f)tp(s?):\/\/([^ \\/]*\.)+[^ \\/]*(:[0-9]+)?\/?/.test(url);
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return isOnlineUrl(url) || isDataUrl(url);
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}
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function isOnlineUrl(url) {
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return /(ht|f)tp(s?):\/\/([^ \\/]*\.)+[^ \\/]*(:[0-9]+)?\/?/.test(url)
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}
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function isDataUrl(url) {
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return /data:image\/(\w+);base64,(.*)/.test(url);
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}
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/**
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@ -63,6 +71,8 @@ function equal(a, b) {
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module.exports = {
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isValidUrl,
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isOnlineUrl,
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isDataUrl,
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equal
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};
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Reference in New Issue
Block a user