React-native 上传图片到亚马逊 s3 [英] React-native upload image to amazons s3
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".我收到回复:
I want to upload images from my app to S3 server. I have all data and codes calculated (tested using curl on computer) but I can't figure out how to call 'fetch' correctly. I'm getting response:
'至少您指定的先决条件之一不成立.条件:Bucket POST 必须是enclosure-type-multipart/form-data'
'At least one of the pre-conditions you specified did not hold. Condition: Bucket POST must be of the enclosure-type-multipart/form-data'
如何在 react-natives fetch 中重新创建表单数据?没有我可以像在 fetches 示例中那样附加然后发送它的 FormData.
How can I recreate form-data in react-natives fetch? There is no FormData to which I can append and then send it like in fetches example.
感谢 @philipp-von-weitershausen,很高兴您添加了此功能.但是我在调用它时遇到了一些麻烦.我收到不支持的 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?
Thanks @philipp-von-weitershausen, greate that you have added this feature. However I have some troubles calling it. I'm getting "Unsupported BodyInit type". Found that is because in fetch.js: "support.formData" returns false. What am I missing when I call fetch?
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();
推荐答案
有些人问,所以我发布我是如何做到的.很久以前它就安静地完成了,所以如果你有任何评论或做的事情真的很糟糕,我愿意接受批评;)照片从 cameraRoll 读取并存储在latestPhoto"中.
Some people asked, so I'm posting how I did it. It was done quiet long time ago so if you have any comments or something is really bad done I'm open to critic ;) Photo is in read from cameraRoll and stored in 'latestPhoto'.
上传照片到 S3 服务器:
Uploading photo to S3 server:
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:
Step 2: Send data:
_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('
')[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 });
},
这篇关于React-native 上传图片到亚马逊 s3的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!