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146 lines
3.7 KiB
146 lines
3.7 KiB
const mimeMap = require('./mimeMap.js')
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function FormData(){
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let fileManager = wx.getFileSystemManager();
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let data = {};
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let files = [];
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this.append = (name, value)=>{
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data[name] = value;
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return true;
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}
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this.appendFile = (name, path)=>{
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let buffer = fileManager.readFileSync(path);
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if(Object.prototype.toString.call(buffer).indexOf("ArrayBuffer") < 0){
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return false;
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}
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files.push({
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name: name,
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buffer: buffer,
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fileName: getFileNameFromPath(path)
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});
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return true;
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}
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this.getData = ()=>convert(data, files)
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}
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function getFileNameFromPath(path){
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let idx=path.lastIndexOf("/");
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return path.substr(idx+1);
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}
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function convert(data, files){
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let boundaryKey = 'wxmpFormBoundary' + randString(); // 数据分割符，一般是随机的字符串
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let boundary = '--' + boundaryKey;
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let endBoundary = boundary + '--';
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let postArray = [];
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//拼接参数
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if(data && Object.prototype.toString.call(data) == "[object Object]"){
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for(let key in data){
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postArray = postArray.concat(formDataArray(boundary, key, data[key]));
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}
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}
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//拼接文件
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if(files && Object.prototype.toString.call(files) == "[object Array]"){
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for(let i in files){
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let file = files[i];
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postArray = postArray.concat(formDataArray(boundary, file.name, file.buffer, file.fileName));
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}
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}
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//结尾
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let endBoundaryArray = [];
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for (var i = 0; i < endBoundary.length; i++) { // 最后取出结束boundary的charCode
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endBoundaryArray.push(...endBoundary.utf8CodeAt(i));
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}
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postArray = postArray.concat(endBoundaryArray);
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return {
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contentType: 'multipart/form-data; boundary=' + boundaryKey,
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buffer: new Uint8Array(postArray).buffer
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}
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}
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function randString() {
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let res = "";
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for (let i = 0; i < 17; i++) {
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let n = parseInt(Math.random() * 62);
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if (n <= 9) {
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res += n;
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}
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else if (n <= 35) {
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res += String.fromCharCode(n + 55);
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}
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else {
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res += String.fromCharCode(n + 61);
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}
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}
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return res;
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}
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function formDataArray(boundary, name, value, fileName){
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let dataString = '';
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let isFile = !!fileName;
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dataString += boundary + '\r\n';
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dataString += 'Content-Disposition: form-data; name="' + name + '"';
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if (isFile){
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dataString += '; filename="' + fileName + '"' + '\r\n';
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dataString += 'Content-Type: ' + getFileMime(fileName) + '\r\n\r\n';
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}
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else{
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dataString += '\r\n\r\n';
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dataString += value;
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}
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var dataArray = [];
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for (var i = 0; i < dataString.length; i++) { // 取出文本的charCode（10进制）
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dataArray.push(...dataString.utf8CodeAt(i));
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}
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if (isFile) {
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let fileArray = new Uint8Array(value);
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dataArray = dataArray.concat(Array.prototype.slice.call(fileArray));
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}
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dataArray.push(..."\r".utf8CodeAt());
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dataArray.push(..."\n".utf8CodeAt());
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return dataArray;
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}
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function getFileMime(fileName){
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let idx = fileName.lastIndexOf(".");
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let mime = mimeMap[fileName.substr(idx)];
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return mime?mime:"application/octet-stream"
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}
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String.prototype.utf8CodeAt = function(i) {
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var str = this;
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var out = [], p = 0;
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var c = str.charCodeAt(i);
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if (c < 128) {
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out[p++] = c;
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} else if (c < 2048) {
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out[p++] = (c >> 6) | 192;
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out[p++] = (c & 63) | 128;
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} else if (
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((c & 0xFC00) == 0xD800) && (i + 1) < str.length &&
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((str.charCodeAt(i + 1) & 0xFC00) == 0xDC00)) {
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// Surrogate Pair
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c = 0x10000 + ((c & 0x03FF) << 10) + (str.charCodeAt(++i) & 0x03FF);
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out[p++] = (c >> 18) | 240;
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out[p++] = ((c >> 12) & 63) | 128;
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out[p++] = ((c >> 6) & 63) | 128;
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out[p++] = (c & 63) | 128;
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} else {
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out[p++] = (c >> 12) | 224;
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out[p++] = ((c >> 6) & 63) | 128;
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out[p++] = (c & 63) | 128;
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}
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return out;
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};
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module.exports = FormData;
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