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113 lines
3.5 KiB
113 lines
3.5 KiB
const app = getApp();
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const Crypto = require('./lib/crypto1/crypto');
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const Base64 = require('./lib/crypto1/base64');
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const IMG_SIZE_TYPE = {
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TYPE_WIDTH: (750 / 570) * 100 | 0,
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TYPE_HEIGHT: (750 / 900) * 100 | 0,
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TYPE_EQUAL: (750 / 750) * 100 | 0
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};
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module.exports = {
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// 是否是本地默认打卡图片
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isDefaultRecordImage(imgPath) {
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return imgPath && imgPath.startsWith('/img');
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},
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// 添加图片裁剪参数
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addImageCutParam (owidth, oheight, imgPath) {
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let ratio = owidth / oheight, width = owidth, height = oheight;
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let result = {};
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if ((ratio * 100 | 0) >= IMG_SIZE_TYPE.TYPE_WIDTH) {
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width = parseInt(oheight * 750 / 570);
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imgPath += "?imageView2/1/w/" + width + "/h/" + (height);
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result.width = width;
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result.height = height;
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} else if ((ratio * 100 | 0) <= IMG_SIZE_TYPE.TYPE_HEIGHT) {
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height = parseInt(width * 900 / 750);
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imgPath += "?imageView2/1/w/" + (width) + "/h/" + height;
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result.width = width;
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result.height = height;
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} else {
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imgPath += "?imageView2/1/w/" + (owidth) + "/h/" + (owidth);
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result.width = result.height = width;
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}
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result.imgPath = imgPath;
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return result;
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},
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// 添加图片缩放、裁剪参数
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addImageCutParamAli(owidth, oheight, imgPath) {
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const MAX_LEN = 4096;
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let ratio = owidth / oheight, width = owidth, height = oheight;
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imgPath += '?x-oss-process=image';
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// 图片宽高大于4096时，需要先进行缩放
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if (owidth > MAX_LEN || oheight > MAX_LEN) {
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imgPath += `/resize,h_${MAX_LEN},w_${MAX_LEN}`;
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// 这里需要重新计算缩放后的图片大小
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if (owidth > oheight) {
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width = MAX_LEN;
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let zoomRatio = width / owidth;
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height = parseInt(zoomRatio * oheight);
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} else if (owidth < oheight) {
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height = MAX_LEN;
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let zoomRatio = height / oheight;
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width = parseInt(zoomRatio * owidth);
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} else {
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width = height = MAX_LEN;
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}
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}
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// 裁剪
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ratio = width / height;
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let result = {};
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if ((ratio * 100 | 0) >= IMG_SIZE_TYPE.TYPE_WIDTH) {
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width = parseInt(oheight * 750 / 570);
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imgPath += `/crop,w_${width},h_${height},g_center`;
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result.width = width;
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result.height = height;
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} else if ((ratio * 100 | 0) <= IMG_SIZE_TYPE.TYPE_HEIGHT) {
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height = parseInt(width * 900 / 750);
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imgPath += `/crop,w_${width},h_${height},g_center`;
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result.width = width;
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result.height = height;
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} else {
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imgPath += `/crop,w_${width},h_${width},g_center`;
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result.width = result.height = width;
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}
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result.imgPath = imgPath;
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return result;
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},
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getMultipartParams() {
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let policyText = {
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"expiration": "2020-01-01T12:00:00.000Z", // 设置该Policy的失效时间，超过这个失效时间之后，就没有办法通过这个policy上传文件了
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"conditions": [
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["content-length-range", 0, 1048576000] // 设置上传文件的大小限制
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]
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};
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let policyBase64 = Base64.encode(JSON.stringify(policyText));
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let bytes = Crypto.HMAC(Crypto.SHA1, policyBase64, app.globalData.config.aliAccessKey, { asBytes: true }) ;
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let signature = Crypto.util.bytesToBase64(bytes);
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return {
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'Filename': 'wx-applet-fittime/' + '${filename}',
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'key': '',
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'policy': policyBase64,
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'OSSAccessKeyId': app.globalData.config.aliAccessId,
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'success_action_status': '200', // 让服务端返回200,不然，默认会返回204
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'signature': signature
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};
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}
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};
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