Question

我尝试使用此处指定的REST API（CREATE FILE）文档将图像上传到Azure中的FILE SERVICE：https://docs.microsoft.com/en-us/rest/api/storageservices/create-file

这是我的代码，它不起作用：

public class azure_cls_cpy {
    public string fileName {get; set;}
    public integer fileSize {get; set;}
    public blob img {get; set;}

    public void createImage(){
        string storageKey = 'account-key';
        string storageName = 'account-name';
        string shareName = 'share-name';
        Datetime dt = Datetime.now();
        string formattedDate = dt.formatGMT('EEE, dd MMM yyyy HH:mm:ss')+ ' GMT';
        system.debug('formattedDate--'+formattedDate);
        system.debug('fileSize--'+fileSize);
        integer imageSize = img.size();
        system.debug('imageSize--'+imageSize);
        string CanonicalizedHeaders = 'x-ms-content-length:'+string.valueOf(fileSize)+'\nx-ms-date:'+formattedDate+'\nx-ms-type:file\nx-ms-version:2016-05-31';

        string CanonicalizedResource = '/' + storageName + '/' + shareName + '/' +fileName;
        string StringToSign = 'PUT\n\n\n\n\nimage/png\n\n\n\n\n\n\n' + CanonicalizedHeaders+'\n'+CanonicalizedResource;
        system.debug('StringToSign--'+StringToSign);

        Blob temp = EncodingUtil.base64Decode(storageKey);
        Blob hmac = Crypto.generateMac('HmacSHA256',Blob.valueOf(StringToSign),temp ); 
        HttpRequest req = new HttpRequest();
        req.setMethod('PUT');
        req.setHeader('x-ms-version','2016-05-31' );
        req.setHeader('x-ms-date', formattedDate);
        req.setHeader('x-ms-content-length',string.valueOf(fileSize));
        req.setHeader('x-ms-type','file');
        req.setHeader('Content-Type','image/png');
        req.setHeader('Content-Length', '0');
        string signature = EncodingUtil.base64Encode(hmac);
        string authHeader =  'SharedKey ' + storageName +':'+signature;
        req.setHeader('Authorization',authHeader);
        req.setEndpoint('https://' + storageName + '.file.core.windows.net/' + shareName + '/'+fileName);
        Http http = new Http();
        HTTPResponse res;
        res = http.send(req);     
        string responseBody = res.getBody();
        system.debug('responseBody--'+responseBody);
    createImage_Put();
    }
}

//Put Range Operation
public void createImage_Put(){

    string storageKey = 'xxxxstorageKeyxxxx';
    string storageName = '<storageName>';
    Datetime dt = Datetime.now();
    string formattedDate = dt.formatGMT('EEE, dd MMM yyyy HH:mm:ss')+ ' GMT';        
    string CanonicalizedHeaders = 'x-ms-date:'+formattedDate+'\nx-ms-range:bytes=0-'+string.valueOf(fileSize)+'\nx-ms-version:2016-05-31\nx-ms-write:update';
    string CanonicalizedResource = '/' + storageName + '/<shareName>/'+fileName+'\ncomp:range';
    string StringToSign = 'PUT\n\n\n'+string.valueOf(fileSize)+'\n\nimage/png\n\n\n\n\n\n\n' + CanonicalizedHeaders+'\n'+CanonicalizedResource;
    system.debug('StringToSign--'+StringToSign);

    Blob temp = EncodingUtil.base64Decode(storageKey);
    Blob hmac = Crypto.generateMac('HmacSHA256',Blob.valueOf(StringToSign),temp ); 
    HttpRequest req = new HttpRequest();
    req.setMethod('PUT');
    req.setHeader('x-ms-version','2016-05-31' );
    req.setHeader('x-ms-date', formattedDate);
    req.setHeader('Content-Length',string.valueOf(fileSize));
    req.setHeader('Content-Type','image/png');
    req.setHeader('x-ms-range','bytes=0-'+string.valueOf(fileSize));
    req.setHeader('x-ms-write','update');
    string signature = EncodingUtil.base64Encode(hmac);
    string authHeader =  'SharedKey '+ storageName+':'+signature;
    req.setHeader('Authorization',authHeader);
    req.setEndpoint('https://storageName.file.core.windows.net/<shareName>/'+fileName+'?comp=range');
    req.setBodyAsBlob(img);
    Http http = new Http();
    HTTPResponse res;
    res = http.send(req);  
    ApexPages.addMessage(new ApexPages.Message(ApexPages.severity.info,'responseBody of PutRange operation--'+res.getBody()));
}
}

在我的代码中，fileName，fileSize，img是我试图上传的图像的属性（动态）。

在这里，我面临来自createImage_Put（PUT RANGE Operation）的问题。以下是错误回复：

<?xml version="1.0" encoding="utf-8"?>
<Error><Code>InvalidHeaderValue</Code>
<Message>The value for one of the HTTP headers is not in the correct format.
RequestId:0996d8a7-001a-0060-7376-2ce658000000
Time:2017-09-13T09:53:06.4734435Z</Message>
<HeaderName>Content-Length</HeaderName>
<HeaderValue>197844</HeaderValue>
 </Error>

Answer 1

代码存在一些问题。

因为您只是创建文件，所以无需在StringToSign中指定文件的内容长度。它应该是空的。
再次因为您正在创建一个空文件，您不应该在请求正文中发送文件数据。它应该是空的。

基于这些，请参阅下面的代码。我能够运行此代码并成功创建了一个空文件。

public class azure_cls_cpy {
    public string fileName {get; set;}
    public integer fileSize {get; set;}
    public blob img {get; set;}

    public void createImage(){
        string storageKey = 'account-key';
        string storageName = 'account-name';
        string shareName = 'share-name';
        Datetime dt = Datetime.now();
        string formattedDate = dt.formatGMT('EEE, dd MMM yyyy HH:mm:ss')+ ' GMT';
        system.debug('formattedDate--'+formattedDate);
        system.debug('fileSize--'+fileSize);
        integer imageSize = img.size();
        system.debug('imageSize--'+imageSize);
        string CanonicalizedHeaders = 'x-ms-content-length:'+string.valueOf(fileSize)+'\nx-ms-date:'+formattedDate+'\nx-ms-type:file\nx-ms-version:2016-05-31';

        string CanonicalizedResource = '/' + storageName + '/' + shareName + '/' +fileName;
        string StringToSign = 'PUT\n\n\n\n\nimage/png\n\n\n\n\n\n\n' + CanonicalizedHeaders+'\n'+CanonicalizedResource;
        system.debug('StringToSign--'+StringToSign);

        Blob temp = EncodingUtil.base64Decode(storageKey);
        Blob hmac = Crypto.generateMac('HmacSHA256',Blob.valueOf(StringToSign),temp ); 
        HttpRequest req = new HttpRequest();
        req.setMethod('PUT');
        req.setHeader('x-ms-version','2016-05-31' );
        req.setHeader('x-ms-date', formattedDate);
        req.setHeader('x-ms-content-length',string.valueOf(fileSize));
        req.setHeader('x-ms-type','file');
        req.setHeader('Content-Type','image/png');
        req.setHeader('Content-Length', '0');
        string signature = EncodingUtil.base64Encode(hmac);
        string authHeader =  'SharedKey ' + storageName +':'+signature;
        req.setHeader('Authorization',authHeader);
        req.setEndpoint('https://' + storageName + '.file.core.windows.net/' + shareName + '/'+fileName);
        Http http = new Http();
        HTTPResponse res;
        res = http.send(req);     
        string responseBody = res.getBody();
        system.debug('responseBody--'+responseBody);
    }
}

使用＆＃39; CREATEFILE＆＃39;将新图像上传到Azure FileService服务

1 个答案: