[英]I am using react-native-camera for video recording in my React Native App. I want to show timer with it. I am new to React Native
[英]I want to generate a hash for a given video, in a react native app
我有一個從React-native App
錄制的video
文件。 現在我想為這個video
文件生成一個數字簽名或哈希值,並將其關聯到區塊鏈。 有什么方法可以為React-native App
的video
文件創建哈希?
您可以使用rnfs
直接從存儲中散列文件。
您也可以使用我編寫的一個小包react-native-hash直接從 URL、文件或字符串進行哈希處理,但是,它目前僅適用於 Android。
你可以使用react-native-fetch-blob
和js-sha3
模塊
將視頻文件編碼為base64
,您可以使用hash
模塊加密base64
值。
import RNFetchBlob from 'react-native-fetch-blob'
sha3_256 = require('js-sha3').sha3_256;
...
let data = ''
let hashdata = '';
RNFetchBlob.fs.readStream(
// file path
PATH_TO_THE_FILE,
// encoding, should be one of `base64`, `utf8`, `ascii`
'base64',
// (optional) buffer size, default to 4096 (4095 for BASE64 encoded data)
// when reading file in BASE64 encoding, buffer size must be multiples of 3.
4095)
.then((ifstream) => {
ifstream.open()
ifstream.onData((chunk) => {
// when encoding is `ascii`, chunk will be an array contains numbers
// otherwise it will be a string
data += chunk
})
ifstream.onError((err) => {
console.log('oops', err)
})
ifstream.onEnd(() => {
hashdata = sha3_256(data); // Convert Data to Hash Value
})
})
如果使用世博會
import * as DocumentPicker from 'expo-document-picker';
import * as FileSystem from 'expo-file-system';
sha3_256 = require('js-sha3').sha3_256;
const response: IDocumentPickerResponse = await DocumentPicker.getDocumentAsync({
copyToCacheDirectory: false,
type: '*/*',
});
const file: string = await FileSystem.readAsStringAsync(
response.uri,
{
encoding: FileSystem.EncodingTypes.Base64,
});
const hashdata = sha3_256(file); // Convert Data to Hash Value
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