[阿里云OSS方式下载文件]

getOSS.m

/*
 
 阿里云出于安全考虑，从2018年8月13日起，直接使用OSS访问域名，从互联网访问OSS上的网页类型文件(mimetype为text/html，扩展名包括htm、 html、jsp、plg、htx 和stm)时，Response Header中会自动加上 Content-Disposition:'attachment=filename;'。即从浏览器访问网页类型文件时，会以附件 形式进行下载。
 
 用户使用自有域名访问OSS的请求，Response Header中不会加上此信息。如何使用自有域名访问OSS，请参考OSS帮助文档“绑定自定义域名”。
 
 表现的现象是， web中下载文件时,我们一般设置Content-Disposition告诉浏览器下载文件的名称,是否在浏览器中内嵌显示.
 Content-disposition: inline; filename=1502849449726.jpg表示浏览器内嵌显示一个文件
 Content-disposition: attachment; filename=1502849449726.xlsx表示会下载文件,如火狐浏览器中
 
 //方法调用示例demo
 NSURL *url = [NSURL URLWithString:@"https://quxue-data.oss-cn-beijing.aliyuncs.com/scene_course/reading/test_record/test223.json"];
 NSString *host = [url host];
 NSString *buckName = [host componentsSeparatedByString:@"."].firstObject;
 
 NSString *path = [url path];
 NSString *objectKey = [path substringFromIndex:1];
 
 */

 
 [[TSAliyunOSSService new] asyncGetBucketName:buckName ObjectKey:objectKey localFilePath:@"" success:^(NSData * _Nonnull data) {
 
 NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
 
 TSEvaluationSubjectInfoModel *model = [TSEvaluationSubjectInfoModel yy_modelWithJSON:str];
 NSLog(@"%@",model);
 
 } failure:^(NSError * _Nonnull error) {
 
 }];
 
- (void)asyncGetBucketName:(NSString *)bucketName
                 ObjectKey:(NSString *)objectKey
             localFilePath:(NSString *)filePath
                   success:(void (^_Nullable)(NSData *))success
                   failure:(void (^_Nullable)(NSError*))failure{
    
    if (![objectKey oss_isNotEmpty]) {
        NSError *error = [NSError errorWithDomain:NSInvalidArgumentException code:0 userInfo:@{NSLocalizedDescriptionKey: @"objectKey should not be nil"}];
        failure(error);
        return;
    }
    
    OSSGetObjectRequest * request = [OSSGetObjectRequest new];
    // 必填字段
    request.bucketName = bucketName;
    request.objectKey = objectKey;
    // 可选字段
    request.downloadProgress = ^(int64_t bytesWritten, int64_t totalBytesWritten, int64_t totalBytesExpectedToWrite) {
        // 当前下载段长度、当前已经下载总长度、一共需要下载的总长度
        NSLog(@"%lld, %lld, %lld", bytesWritten, totalBytesWritten, totalBytesExpectedToWrite);
    };
    // request.range = [[OSSRange alloc] initWithStart:0 withEnd:99]; // bytes=0-99，指定范围下载
    // request.downloadToFileURL = [NSURL fileURLWithPath:@"<filepath>"]; // 如果需要直接下载到文件，需要指明目标文件地址
    
    OSSTask * getTask = [[OSSManager sharedManager].defaultClient getObject:request];
    
    [getTask continueWithBlock:^id(OSSTask *task) {
        if (!task.error) {
            NSLog(@"download object success!");
            OSSGetObjectResult * getResult = task.result;
            NSLog(@"download result: %@", getResult.downloadedData);
            success(getResult.downloadedData);
        } else {
            NSLog(@"download object failed, error: %@" ,task.error);
            failure(task.error);
        }
        return nil;
    }];
}