forked from lxm_tools/flutter-picgo
93 lines
3.1 KiB
Dart
93 lines
3.1 KiB
Dart
import 'dart:convert';
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import 'dart:io';
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import 'package:crypto/crypto.dart';
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import 'package:dio/dio.dart';
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import 'package:flutter_picgo/utils/net.dart';
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import 'package:flutter_picgo/utils/strings.dart';
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class AliyunApi {
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// 还需要拼接buckername 例如zjyzy.oss-cn-shenzhen.aliyuncs.com
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static const BASE_URL = 'aliyuncs.com';
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static postObject(String bucket, String aera, FormData data) async {
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Response res = await NetUtils.getInstance().post(
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'https://$bucket.$aera.aliyuncs.com',
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data: data,
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);
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return res.headers;
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}
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static deleteObject(
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String bucket, String aera, String object, String auth) async {
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Response res = await NetUtils.getInstance()
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.delete('https://$bucket.$aera.aliyuncs.com/$object',
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options: Options(headers: {
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'Authorization': auth,
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'Date': HttpDate.format(new DateTime.now()),
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}));
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return res.headers;
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}
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/// Content-MD5的计算
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static String generateContentMD5(String content) {
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// 先计算MD5加密的二进制数组
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var digest = md5.convert(utf8.encode(content));
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return base64.encode(digest.bytes);
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}
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/// 构建CanonicalizedResource
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static String buildCanonicalizedResource(
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String bucketName, String objectName) {
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if (isBlank(bucketName)) {
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return '/';
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}
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if (isBlank(objectName)) {
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return '/$bucketName/';
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} else {
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return '/$bucketName/$objectName';
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}
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}
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/// form policy
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static String buildEncodePolicy(String objectName) {
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var policyText = {
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"expiration":
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"2030-01-01T00:00:00.000Z", // 设置Policy的失效时间，如果超过失效时间，就无法通过此Policy上传文件
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"conditions": [
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{
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"key": objectName,
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} // 设置上传文件的大小限制，如果超过限制，文件上传到OSS会报错
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]
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};
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var encodePolicy = base64.encode(utf8.encode(json.encode(policyText)));
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return encodePolicy;
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}
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/// Form Authorization
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static String buildPostSignature(
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String accessKeyId, String accessKeySecret, String encodePolicy) {
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// 使用SecertKey对上一步生成的原始字符串计算HMAC-SHA1签名：
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var hmacsha1 = Hmac(sha1, utf8.encode(accessKeySecret));
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var sign = hmacsha1.convert(utf8.encode(encodePolicy));
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var encodeSign = base64.encode(sign.bytes);
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return encodeSign;
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}
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/// Authorization
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static String buildSignature(String accessKeyId, String accessKeySecret,
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String verb, String bucketName, String objectName,
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{String contentMd5 = '', String contentType = ''}) {
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var canonicalizedResource =
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buildCanonicalizedResource(bucketName, objectName);
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var date = HttpDate.format(new DateTime.now());
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var originSign =
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'${verb.toUpperCase()}\n$contentMd5\n$contentType\n$date\n$canonicalizedResource';
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// 使用SecertKey对上一步生成的原始字符串计算HMAC-SHA1签名：
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var hmacsha1 = Hmac(sha1, utf8.encode(accessKeySecret));
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var sign = hmacsha1.convert(utf8.encode(originSign));
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var encodeSign = base64.encode(sign.bytes);
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return 'OSS $accessKeyId:$encodeSign';
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}
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}
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