firebase - react-native-fetch-blob 正在阻止 React Native 应用程序中的 Firebase 调用

Question

我有一个使用 Firebase、firestore 的 React Native 应用程序。 为了上传图像，我使用“react-native-fetch-blob”来创建 Blob。

在我用来上传文件的js文件中，我的代码如下所示:

const Blob = RNFetchBlob.polyfill.Blob
const fs = RNFetchBlob.fs
window.XMLHttpRequest = RNFetchBlob.polyfill.XMLHttpRequest
window.Blob = Blob

**

window.XMLHttpRequest = RNFetchBlob.polyfill.XMLHttpRequest

**

由于这个window.XMLHttpRequest，我的应用程序被阻止，并且没有从 firebase 获得任何响应(不捕获/什么都不 => 只是通过代码传递)。

如果我删除了这一行，我可以读取/写入 firestore，但是我无法上传图像。

我可以做些什么来上传图像并继续写入 firestore 吗？

这是我的页面:

import ImagePicker from 'react-native-image-crop-picker';
import RNFetchBlob from 'react-native-fetch-blob'
import firebase from 'firebase';

const Blob = RNFetchBlob.polyfill.Blob
const fs = RNFetchBlob.fs
window.XMLHttpRequest = RNFetchBlob.polyfill.XMLHttpRequest
window.Blob = Blob

export const choozFile = (isSmalImg) => {
    let options = {
        width: isSmalImg ? 100 : 690,
        height: isSmalImg ? 100 : 390,
        cropping: true,
        mediaType: 'photo'
    };
    return new Promise((resolve, reject) => {
        ImagePicker.openPicker(options).then(response => {
            let source = { uri: response.path };
            resolve({ avatarSource: source, isProfileImg: isSmalImg })
        })
    });
}

export const addReportToFirebase = (obj = {}, uri, isProfile, mime = 'application/octet-stream') => {
    obj["uId"] = "JtXNfy34BNRfCoRO6luwhIJke0l2";
    const storage = firebase.storage();
    const db = firebase.firestore();
    const uploadUri = uri;
    const sessionId = new Date().getTime();
    let uploadBlob = null;

    const imageRef = storage.ref(`images${isProfile ? '/profile' : ''}`).child(`${sessionId}`)

    fs.readFile(uploadUri, 'base64')
        .then((data) => {
            return Blob.build(data, { type: `${mime};BASE64` })
        })
        .then((blob) => {
            uploadBlob = blob
            return imageRef.put(blob, { contentType: mime })
        })
        .then(() => {
            uploadBlob.close()
             imageRef.getDownloadURL().then((url)=>{
                obj['image'] = url;
                db.collection("reports").add(obj).then(() => {
                    console.log("Document successfully written!");
                }).catch((err) => {
                    console.error("Error writing document: ", err);                    
                });
            })
        })
        .catch((error) => {
            console.log('upload Image error: ', error)
        })
};

Answer 1

我遇到了同样的问题，我做了一些技巧来解决这个问题。这可能不是最正确的解决方案，但它对我有用。

技巧是将 RNFetchBlob.polyfill.XMLHttpRequest 保留在 window.XMLHttpRequest 中，仅用于上传操作。将图像上传到存储后，将 window.XMLHttpRequest 恢复为原始值。

您的代码将如下所示。

    import ImagePicker from 'react-native-image-crop-picker';
import RNFetchBlob from 'react-native-fetch-blob'
import firebase from 'firebase';

const Blob = RNFetchBlob.polyfill.Blob
const fs = RNFetchBlob.fs

window.Blob = Blob

export const choozFile = (isSmalImg) => {
    let options = {
        width: isSmalImg ? 100 : 690,
        height: isSmalImg ? 100 : 390,
        cropping: true,
        mediaType: 'photo'
    };
    return new Promise((resolve, reject) => {
        ImagePicker.openPicker(options).then(response => {
            let source = { uri: response.path };
            resolve({ avatarSource: source, isProfileImg: isSmalImg })
        })
    });
}

export const addReportToFirebase = (obj = {}, uri, isProfile, mime = 'application/octet-stream') => {
    obj["uId"] = "JtXNfy34BNRfCoRO6luwhIJke0l2";
    const storage = firebase.storage();
    const db = firebase.firestore();
    const uploadUri = uri;
    const sessionId = new Date().getTime();
    let uploadBlob = null;

    //keep reference to original value
    const originalXMLHttpRequest = window.XMLHttpRequest;

 window.XMLHttpRequest = RNFetchBlob.polyfill.XMLHttpRequest
    const imageRef = storage.ref(`images${isProfile ? '/profile' : ''}`).child(`${sessionId}`)

    fs.readFile(uploadUri, 'base64')
        .then((data) => {
            return Blob.build(data, { type: `${mime};BASE64` })
        })
        .then((blob) => {
            uploadBlob = blob
            return imageRef.put(blob, { contentType: mime })
        })
        .then(() => {
            uploadBlob.close();

            //revert value to original
            window.XMLHttpRequest = originalXMLHttpRequest ;
             imageRef.getDownloadURL().then((url)=>{
                obj['image'] = url;
                db.collection("reports").add(obj).then(() => {
                    console.log("Document successfully written!");
                }).catch((err) => {
                    console.error("Error writing document: ", err);                    
                });
            })
        })
        .catch((error) => {
            console.log('upload Image error: ', error)
        })
};