我正在使用firebase云功能生成缩略图并将已签名的图片网址存储在firestore中:
'use strict';
const functions = require('firebase-functions');
const mkdirp = require('mkdirp-promise');
const gcs = require('@google-cloud/storage')({keyFilename: 'service-account-credentials.json'});
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);
const spawn = require('child-process-promise').spawn;
const path = require('path');
const os = require('os');
const fs = require('fs');
const THUMB_MAX_HEIGHT = 200;
const THUMB_MAX_WIDTH = 200;
const THUMB_PREFIX = 'thumb_';
exports.onUploadImage = functions.storage.object().onChange(async event => {
const filePath = event.data.name;
const contentType = event.data.contentType;
const fileDir = path.dirname(filePath);
const fileName = path.basename(filePath);
const thumbFilePath = path.normalize(path.join(fileDir, `${THUMB_PREFIX}${fileName}`));
const tempLocalFile = path.join(os.tmpdir(), filePath);
const tempLocalDir = path.dirname(tempLocalFile);
const tempLocalThumbFile = path.join(os.tmpdir(), thumbFilePath);
if (!contentType.startsWith('image/')) {
return null;
}
if (fileName.startsWith(THUMB_PREFIX)) {
return null;
}
if (event.data.resourceState === 'not_exists') {
return null;
}
const tankId = event.data.metadata.tankId;
const userId = event.data.metadata.userId;
const imageType = event.data.metadata.type;
const bucket = gcs.bucket(event.data.bucket);
const file = bucket.file(filePath);
const thumbFile = bucket.file(thumbFilePath);
const metadata = {
contentType: contentType,
customMetadata: {
'type': imageType
}
};
try {
await mkdirp(tempLocalDir);
await file.download({destination: tempLocalFile});
await spawn('convert', [tempLocalFile, '-thumbnail', `${THUMB_MAX_WIDTH}x${THUMB_MAX_HEIGHT}>`, tempLocalThumbFile], {capture: ['stdout', 'stderr']});
await bucket.upload(tempLocalThumbFile, { destination: thumbFilePath, metadata: metadata });
await fs.unlinkSync(tempLocalFile);
await fs.unlinkSync(tempLocalThumbFile);
const config = {
action: 'read',
expires: '03-01-2500'
};
const results = await Promise.all([
thumbFile.getSignedUrl(config),
file.getSignedUrl(config)
]);
const thumbResult = results[0];
const originalResult = results[1];
const thumbFileUrl = thumbResult[0];
const fileUrl = originalResult[0];
const tankRef = admin.firestore().collection('tanks').doc(tankId);
switch(imageType) {
case 'gallery':
await tankRef
.collection('gallery')
.add({
url: fileUrl,
thumbnail: thumbFileUrl,
createdAt: new Date()
});
const tankSnapshot = await tankRef.get();
const tankData = await tankSnapshot.data();
let galleryCount = tankData.galleryCount || 0;
galleryCount += 1;
if (galleryCount < 0) galleryCount = 0;
return await tankRef.update({ galleryCount }, { merge: true });
case 'tankImage':
await tankRef.set({ image: fileUrl, image_thumb: thumbFileUrl }, { merge: true });
return null;
case 'profileImage':
await admin.auth().updateUser(userId, { photoURL: thumbFileUrl });
await admin.firestore()
.collection('users')
.doc(userId)
.set({image: fileUrl});
return null;
default:
return null
}
}
catch(err) {
console.log(err);
}
});
现在我正在尝试编写另一个云函数,在删除firestore db条目时删除存储文件:
exports.onGalleryImageDelete = functions.firestore
.document('/tanks/{tankId}/gallery/{docId}')
.onDelete(async event => {
const deletedDoc = event.data.previous.data();
const bucket = admin.storage().bucket();
await bucket.file(deletedDoc.url).delete(); // this is wrong... no idea how to solve this
await bucket.file(deletedDoc.thumbnail).delete();
return await updateTankDocumentCounter(event, 'galleryCount', 'onDelete');
});
此代码实际上不起作用并返回一些API错误。我如何从给定的签名下载网址中删除这些图片?
答案 0 :(得分:0)
根据Doug Stevenson的评论,我将路径存储到db并最终得到了这个云函数:
exports.onGalleryImageDelete = functions.firestore
.document('/tanks/{tankId}/gallery/{docId}')
.onDelete(async event => {
const deletedDoc = event.data.previous.data();
const filePath = deletedDoc.path;
const fileDir = path.dirname(filePath);
const fileName = path.basename(filePath);
const thumbFilePath = path.normalize(path.join(fileDir, `${THUMB_PREFIX}${fileName}`));
const bucket = admin.storage().bucket();
return await Promise.all([
await bucket.file(filePath).delete(),
await bucket.file(thumbFilePath).delete(),
updateTankDocumentCounter(event, 'galleryCount', 'onDelete')
]);
});
&#13;
答案 1 :(得分:0)
我也遇到了这个问题。结果返回一个存储所有隐藏信息的文档。 如果对Firebase有好处,其他人则非常糟糕。