[英]Python / Django fails at decoding file encoded as base64 by javascript
I'm using this, in react, to base64 encode an image file: 我正在使用它作为对base64编码图像文件的响应:
fileToBase64 = (filename, filepath) => {
return new Promise(resolve => {
var file = new File([filename], filepath);
var reader = new FileReader();
reader.onload = function(event) {
resolve(event.target.result);
};
reader.readAsDataURL(file);
});
};
Which gets called by this: 哪个被这样调用:
handleChangeFile = event => {
const { name, files } = event.target;
if (files.length) {
const file = files[0];
let fields = this.state.fields;
this.fileToBase64(file).then(result => {
fields[name].value = result;
});
fields[name].isFilled = true;
this.setState({
fields: fields
});
}
};
And the whole fields variable gets posted to a django server, no issues so far. 整个字段变量都已发布到django服务器,到目前为止没有问题。
On the python django end: 在python django端:
str_encoded = request.data["file"]
str_decoded = base64.b64decode(str_encoded)
The second line returns an error that binascii.Error: Invalid base64-encoded string: length cannot be 1 more than a multiple of 4
. 第二行返回一个错误,该错误为binascii.Error: Invalid base64-encoded string: length cannot be 1 more than a multiple of 4
。 I've googled and read that this is probably a padding issue, but I don't know how to fix it. 我已经在Google上搜索并阅读到这可能是一个填充问题,但是我不知道如何解决它。
You will have to strip the base64
string from the prefix added by javascript
. 您将必须从javascript
添加的前缀中删除base64
字符串。 The prefix is sth like data:{type};base64,{actual-base64-string-follows}
前缀就像data:{type};base64,{actual-base64-string-follows}
一样data:{type};base64,{actual-base64-string-follows}
In php, where I had same issue, I tested if string starts with "data:"
prefix and I strip it from start of string up to the position of the ;
在php中,我遇到了同样的问题,我测试了字符串是否以"data:"
前缀开头,并且将其从字符串开头剥离到;
的位置;
(semicolon) plus 8 characters (to catch the final ";base64,"). (分号)加上8个字符(以捕获最后的“; base64”)。
Then you can use python to decode the base64
string remaining as it is now a valid base64
string. 然后,您可以使用python解码剩余的base64
字符串,因为它现在是有效的base64
字符串。
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