React-native 上传图片到 amazon s3

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【中文标题】React-native 上传图片到 amazon s3【英文标题】:React-native upload image to amazons s3 【发布时间】:2015-08-24 13:51:00 【问题描述】:

我想将图像从我的应用上传到 S3 服务器。我计算了所有数据和代码(在计算机上使用 curl 测试),但我无法弄清楚如何正确调用“获取”。我得到了回应:

'您指定的前提条件中至少有一个不成立。条件:bucket POST 必须是enclosure-type-multipart/form-data'

如何在 react-natives fetch 中重新创建表单数据?没有我可以附加的 FormData,然后像 fetches 示例中那样发送它。

编辑: 感谢@philipp-von-weitershausen,感谢您添加了此功能。但是我在调​​用它时遇到了一些麻烦。我得到“不支持的 BodyInit 类型”。发现是因为在 fetch.js: "support.formData" 返回 false。当我调用 fetch 时,我错过了什么?

我的代码示例:

 var form = new FormData();
 form.append("FormData", true)
 form.append("name", this.state.invoiceNumber)
 form.append("key", this.state.invoiceNumber)
 form.append("Content-Type", "image/png")
 form.append('file', this.props.uri)
 //alert(FormData.prototype.isPrototypeOf(form))

  fetch(amazon_url,body: form,mode: "FormData", method: "post", headers: "Content-Type": "multipart/FormData")
          .then((response) => response.json())
          .catch((error) => 
             alert("ERROR " + error)
          )
          .then((responseData) => 
             alert("Succes "+ responseData)
          )
          .done();

【问题讨论】:

您有最终工作代码的示例吗?我也遇到了麻烦。 事实上,你有没有一个例子可以发布表单变量(没有图像 - 看到下一个 RN 构建添加图像支持)。 react-native-fetch-blob 可以为您做到这一点。 【参考方案1】:

multipart/form-data 对混合有效负载(JS 字符串 + 图像有效负载)的 React Native(通过 XHR FormData API)的支持正在开发中。它应该很快就会登陆 GitHub。

【讨论】:

aaa 它登陆了:github.com/facebook/react-native/commit/… 太棒了!!我看到你也改变了调用 fetch 的方法?它停止工作或显示错误:Undiefiened 不是函数(评估 RCTDataMenager.queryData('http', methode: method, url: url, data: data, headers: headers )。任何机会快速提示发生了什么变化? 没关系,我有两个版本的 react-native 并且在这个文件夹中彼此不喜欢......【参考方案2】:

有人问,所以我发布了我是如何做到的。它很久以前就安静地完成了,所以如果你有任何 cmets 或者做得真的很糟糕,我愿意接受批评;) 照片从 cameraRoll 中读取并存储在 'latestPhoto' 中。

上传照片到 S3 服务器:

第一步:生成数据:

_addTextParam() 
    var textParams = this.state.textParams;
    s3_upload_id = this.makeid()
    textParams.push( name: "key", value: this.state.upload_path + s3_upload_id + '/' + this.state.att_name + ".jpg" )
    textParams.push( name: "AWSAccessKeyId", value: this.state.key )
    textParams.push( name: "acl", value: "public-read" )
    textParams.push( name: "success_action_status", value: "201" )
    textParams.push( name: "policy", value: this.state.policy )
    textParams.push( name: "signature", value: this.state.signature )
    textParams.push( name: "Content-Type", value: "image/jpeg" )

    this.setState( textParams: textParams );
  

第 2 步:发送数据:

  _send() 

    this._addTextParam()
    var xhr = new XMLHttpRequest();
    xhr.open('POST', "http://" + this.state.fs_domain + "." + this.state.server);
    xhr.onload = () => 
      this.setState( isUploading: false );
      if (xhr.status !== 201) 
        Alertios.alert( 
          'Upload failed',
          'Expected HTTP 200 OK response, got ' + xhr.status + "/" + xhr.responseText
        );
        return;
      

      if (!xhr.responseText) 
        AlertIOS.alert(
          'Upload failed',
          'No response payload.'
        );
        return;
      
      var index = xhr.responseText.indexOf( "http://" + this.state.fs_domain + "." + this.state.server);
      if (index === -1) 
        AlertIOS.alert(
          'Upload failed',
          'Invalid response payload.'
        );
        return;
      
      var url = xhr.responseText.slice(index).split('\n')[0];
      this.state.s3_file_id = xhr.responseText.split('Tag>"')[1].split('"')[0]
      this.state.s3_file_path = xhr.responseText.split('Location>')[1].split('<')[0]
      this.setState( isUploading: false );
      RCTDeviceEventEmitter.emit('Uploaded')

    ;
    var formdata = new FormData();

    this.state.textParams.forEach((param) => 
        formdata.append(param.name, param.value)
      
    );

    formdata.append('file', ...this.state.latestPhoto, name: (this.state.att_name+".jpg") );

    xhr.send(formdata);
    this.setState( isUploading: true );

  ,

【讨论】:

您是如何生成签名的?我在网上找到的所有模块都依赖于一些节点功能,例如 httpfs @HarryMoreno 照片由:CameraRoll 加载,我从我们用 Ruby on Rails 编写的主应用程序获取签名。但我认为您可以根据 AWS 文档重新创建它。【参考方案3】:

@Michał Zubrzycki 谢谢,您上传图片的代码对我有用,只需稍作改动。

const photo = 
  uri: user.profilePicture,
  type: "image/jpeg",
  name: "photo.jpg"
;
const form = new FormData();
form.append("ProfilePicture", photo);
fetch(Constants.API_USER + "me/profilePicture", 
  body: form,
  method: "PUT",
  headers: 
    "Content-Type": "multipart/form-data",
    Authorization: "Bearer " + user.token
  
)
  .then(response => response.json())
  .catch(error => 
    console.log("ERROR ", error);
  )
  .then(responseData => 
    console.log("Success", responseData);
  )
  .done();

【讨论】:

【参考方案4】:

S3 选项:

// this.state.s3options in YourComponent

  "url": "https://yourapp.s3.eu-central-1.amazonaws.com",
  "fields": 
    "key": "cache/22d65141b48c5c44eaf93a0f6b0abc30.jpeg",
    "policy": "eyJleHBpcm...1VDE0Mzc1OVoifV19",
    "x-amz-credential": "AK...25/eu-central-1/s3/aws4_request",
    "x-amz-algorithm": "AWS4-HMAC-SHA256",
    "x-amz-date": "20161125T143759Z",
    "x-amz-signature": "87863c360...b9b304bfe650"
  

组件:

class YourComponent extends Component 
  // ...

  // fileSource looks like: uri: "content://media/external/images/media/13", isStatic: true
  async uploadFileToS3(fileSource) 
    try 
      var formData = new FormData();
      // Prepare the formData by the S3 options
      Object.keys(this.state.s3options.fields).forEach((key) => 
        formData.append(key, this.state.s3options.fields[key]);
      );
      formData.append('file', 
        uri: fileSource.uri,
        type: 'image/jpeg',
      );
      formData.append('Content-Type', 'image/jpeg')

      var request = new XMLHttpRequest();
      request.onload = function(e) 
        if (e.target.status === 204) 
          // Result in e.target.responseHeaders.Location
          this.setState(avatarSourceRemote: uri: e.target.responseHeaders.Location)
        
      .bind(this)
      request.open('POST', this.state.s3options.url, true);
      request.setRequestHeader('Content-type', 'multipart/form-data');
      request.send(formData);
     catch(error) 
      console.error(error);
    
  

  // Example display the uploaded image
  render() 
    if (this.state.avatarSourceRemote) 
      return (
        <Image source=this.state.avatarSourceRemote style=width: 100, height: 100 />
      );
     else 
      return (
        <Text>No Image</Text>
      );
    
  

【讨论】:

【参考方案5】:
//You need to Initialize Amplify in App.js

import Amplify from 'aws-amplify';


Amplify.configure(
  Auth: 
    identityPoolId: Config.AWS_COGNITO_IDENTITY_POOL_ID, //REQUIRED - Amazon Cognito Identity Pool ID
    region: Config.S3_REGION, // REQUIRED - Amazon Cognito Region
  ,
  Storage: 
    AWSS3: 
      bucket: Config.S3_BUCKET,
      region: Config.S3_REGION,
    ,
  ,
);


// In your file

import Storage from 'aws-amplify';

export const S3UploadFile = async (uri, name, type) => 
  const file = await fetch(uri);
  const blob = await file.blob();
  const key = '/' + name;

  return Storage.put(key, blob, 
    contentType: type,
  );
;

【讨论】:

我从哪里获得 accessKeyId: AWS_KEY_ID, secretAccessKey: AWS_SECRET, .?? 你可以在编辑后从这里找到这些***.com/questions/44481490/…

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