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metadata.ts
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metadata.ts
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import * as uuid from "uuid";
import * as crypto from "crypto";
import { EmulatorRegistry } from "../registry";
import { Emulators } from "../types";
import { StorageCloudFunctions } from "./cloudFunctions";
import { crc32c } from "./crc";
type RulesResourceMetadataOverrides = {
[Property in keyof RulesResourceMetadata]?: RulesResourceMetadata[Property];
};
type SerializedFileMetadata = Omit<StoredFileMetadata, "timeCreated" | "updated"> & {
timeCreated: string;
updated: string;
};
/**
* Note: all fields of this object which do not begin with _ are serialized
* during export, so add/remove/modify fields with caution.
*/
export class StoredFileMetadata {
name: string;
bucket: string;
generation: number;
metageneration: number;
contentType: string;
timeCreated: Date;
updated: Date;
storageClass: string;
size: number;
md5Hash: string;
contentEncoding: string;
contentDisposition: string;
contentLanguage?: string;
cacheControl?: string;
customTime?: Date;
crc32c: string;
etag: string;
downloadTokens: string[];
customMetadata?: { [s: string]: string };
constructor(
opts: Partial<SerializedFileMetadata> & {
name: string;
bucket: string;
contentType: string;
},
private _cloudFunctions: StorageCloudFunctions,
bytes?: Buffer,
incomingMetadata?: IncomingMetadata
) {
// Required fields
this.name = opts.name;
this.bucket = opts.bucket;
this.contentType = opts.contentType;
// Optional fields
this.metageneration = opts.metageneration || 1;
this.generation = opts.generation || Date.now();
this.storageClass = opts.storageClass || "STANDARD";
this.etag = opts.etag || "someETag";
this.contentDisposition = opts.contentDisposition || "inline";
this.cacheControl = opts.cacheControl;
this.contentLanguage = opts.contentLanguage;
this.customTime = opts.customTime;
this.contentEncoding = opts.contentEncoding || "identity";
this.customMetadata = opts.customMetadata;
this.downloadTokens = [];
// Special handling for date fields
this.timeCreated = opts.timeCreated ? new Date(opts.timeCreated) : new Date();
this.updated = opts.updated ? new Date(opts.updated) : this.timeCreated;
// Fields derived from bytes
if (bytes) {
this.size = bytes.byteLength;
this.md5Hash = generateMd5Hash(bytes);
this.crc32c = `${crc32c(bytes)}`;
} else if (opts.size !== undefined && opts.md5Hash && opts.crc32c) {
this.size = opts.size;
this.md5Hash = opts.md5Hash;
this.crc32c = opts.crc32c;
} else {
throw new Error("Must pass bytes array or opts object with size, md5hash, and crc32c");
}
if (incomingMetadata) {
this.update(incomingMetadata);
}
}
asRulesResource(proposedChanges?: RulesResourceMetadataOverrides): RulesResourceMetadata {
let rulesResource: RulesResourceMetadata = {
name: this.name,
bucket: this.bucket,
generation: this.generation,
metageneration: this.metageneration,
size: this.size,
timeCreated: this.timeCreated,
updated: this.updated,
md5Hash: this.md5Hash,
crc32c: this.crc32c,
etag: this.etag,
contentDisposition: this.contentDisposition,
contentEncoding: this.contentEncoding,
contentType: this.contentType,
metadata: this.customMetadata || {},
};
if (proposedChanges) {
if (proposedChanges.md5Hash !== rulesResource.md5Hash) {
// Step the generation forward and reset values
rulesResource.generation = Date.now();
rulesResource.metageneration = 1;
rulesResource.timeCreated = new Date();
rulesResource.updated = rulesResource.timeCreated;
} else {
// Otherwise this was just a metadata change
rulesResource.metageneration++;
}
rulesResource = {
...rulesResource,
...proposedChanges,
};
}
return rulesResource;
}
update(incoming: IncomingMetadata): void {
if (incoming.contentDisposition) {
this.contentDisposition = incoming.contentDisposition;
}
if (incoming.contentType) {
this.contentType = incoming.contentType;
}
if (incoming.metadata) {
this.customMetadata = incoming.metadata;
}
if (incoming.contentLanguage) {
this.contentLanguage = incoming.contentLanguage;
}
if (incoming.contentEncoding) {
this.contentEncoding = incoming.contentEncoding;
}
if (this.generation) {
this.generation++;
}
this.updated = new Date();
if (incoming.cacheControl) {
this.cacheControl = incoming.cacheControl;
}
this._cloudFunctions.dispatch("metadataUpdate", new CloudStorageObjectMetadata(this));
}
addDownloadToken(): void {
if (!this.downloadTokens.length) {
this.downloadTokens.push(uuid.v4());
return;
}
this.downloadTokens = [...this.downloadTokens, uuid.v4()];
this.update({});
}
deleteDownloadToken(token: string): void {
if (!this.downloadTokens.length) {
return;
}
const remainingTokens = this.downloadTokens.filter((t) => t != token);
this.downloadTokens = remainingTokens;
if (remainingTokens.length == 0) {
// if empty after deleting, always add a new token.
this.addDownloadToken();
}
this.update({});
}
static fromJSON(data: string, cloudFunctions: StorageCloudFunctions): StoredFileMetadata {
const opts = JSON.parse(data) as SerializedFileMetadata;
return new StoredFileMetadata(opts, cloudFunctions);
}
public static toJSON(metadata: StoredFileMetadata): string {
return JSON.stringify(
metadata,
(key, value) => {
if (key.startsWith("_")) {
return undefined;
}
return value;
},
2
);
}
}
export interface RulesResourceMetadata {
name: string;
bucket: string;
generation: number;
metageneration: number;
size: number;
timeCreated: Date;
updated: Date;
md5Hash: string;
crc32c: string;
etag: string;
contentDisposition: string;
contentEncoding: string;
contentType: string;
metadata: { [s: string]: string };
}
export interface IncomingMetadata {
contentType?: string;
contentLanguage?: string;
contentEncoding?: string;
contentDisposition?: string;
cacheControl?: string;
metadata?: { [s: string]: string };
}
export class OutgoingFirebaseMetadata {
name: string;
bucket: string;
generation: string;
metageneration: string;
contentType: string;
timeCreated: string;
updated: string;
storageClass: string;
size: string;
md5Hash: string;
contentEncoding: string;
contentDisposition: string;
contentLanguage?: string;
cacheControl?: string;
crc32c: string;
etag: string;
downloadTokens: string;
metadata: object | undefined;
constructor(md: StoredFileMetadata) {
this.name = md.name;
this.bucket = md.bucket;
this.generation = md.generation.toString();
this.metageneration = md.metageneration.toString();
this.contentType = md.contentType;
this.timeCreated = toSerializedDate(md.timeCreated);
this.updated = toSerializedDate(md.updated);
this.storageClass = md.storageClass;
this.size = md.size.toString();
this.md5Hash = md.md5Hash;
this.crc32c = md.crc32c;
this.etag = md.etag;
this.downloadTokens = md.downloadTokens.join(",");
this.contentEncoding = md.contentEncoding;
this.contentDisposition = md.contentDisposition;
this.metadata = md.customMetadata;
this.contentLanguage = md.contentLanguage;
this.cacheControl = md.cacheControl;
}
}
export class CloudStorageBucketMetadata {
kind = "#storage/bucket";
selfLink: string;
id: string;
name: string;
projectNumber: string;
metageneration: string;
location: string;
storageClass: string;
etag: string;
timeCreated: string;
updated: string;
locationType: string;
constructor(id: string) {
this.name = id;
this.id = id;
this.selfLink = `http://${EmulatorRegistry.getInfo(Emulators.STORAGE)?.host}:${
EmulatorRegistry.getInfo(Emulators.STORAGE)?.port
}/v1/b/${this.id}`;
this.timeCreated = toSerializedDate(new Date());
this.updated = this.timeCreated;
this.projectNumber = "000000000000";
this.metageneration = "1";
this.location = "US";
this.storageClass = "STANDARD";
this.etag = "====";
this.locationType = "mutli-region";
}
}
export class CloudStorageObjectMetadata {
kind = "#storage#object";
name: string;
bucket: string;
generation: string;
metageneration: string;
contentType: string;
timeCreated: string;
updated: string;
storageClass: string;
size: string;
md5Hash: string;
crc32c: string;
etag: string;
metadata?: { [s: string]: string };
contentLanguage?: string;
cacheControl?: string;
customTime?: string;
id: string;
timeStorageClassUpdated: string;
selfLink: string;
mediaLink: string;
constructor(md: StoredFileMetadata) {
this.name = md.name;
this.bucket = md.bucket;
this.generation = md.generation.toString();
this.metageneration = md.metageneration.toString();
this.contentType = md.contentType;
this.timeCreated = toSerializedDate(md.timeCreated);
this.updated = toSerializedDate(md.updated);
this.storageClass = md.storageClass;
this.size = md.size.toString();
this.md5Hash = md.md5Hash;
this.etag = md.etag;
this.metadata = {};
if (Object.keys(md.customMetadata || {})) {
this.metadata = {
...this.metadata,
...md.customMetadata,
};
}
if (md.downloadTokens.length) {
this.metadata = {
...this.metadata,
firebaseStorageDownloadTokens: md.downloadTokens.join(","),
};
}
if (!Object.keys(this.metadata).length) {
delete this.metadata;
}
if (md.contentLanguage) {
this.contentLanguage = md.contentLanguage;
}
if (md.cacheControl) {
this.cacheControl = md.cacheControl;
}
if (md.customTime) {
this.customTime = toSerializedDate(md.customTime);
}
// I'm not sure why but @google-cloud/storage calls .substr(4) on this value, so we need to pad it.
this.crc32c = "----" + Buffer.from([md.crc32c]).toString("base64");
this.timeStorageClassUpdated = toSerializedDate(md.timeCreated);
this.id = `${md.bucket}/${md.name}/${md.generation}`;
this.selfLink = `http://${EmulatorRegistry.getInfo(Emulators.STORAGE)?.host}:${
EmulatorRegistry.getInfo(Emulators.STORAGE)?.port
}/storage/v1/b/${md.bucket}/o/${encodeURIComponent(md.name)}`;
this.mediaLink = `http://${EmulatorRegistry.getInfo(Emulators.STORAGE)?.host}:${
EmulatorRegistry.getInfo(Emulators.STORAGE)?.port
}/download/storage/v1/b/${md.bucket}/o/${encodeURIComponent(md.name)}?generation=${
md.generation
}&alt=media`;
}
}
/**
* Returns the given date formatted as `YYYY-mm-ddTHH:mm:ss.fffZ`.
* for example: 2020-09-18T00:31:33.328Z
* @param d the date to format.
* @return the formatted date.
*/
export function toSerializedDate(d: Date): string {
const day = `${d.getFullYear()}-${(d.getMonth() + 1)
.toString()
.padStart(2, "0")}-${d.getDate().toString().padStart(2, "0")}`;
const time = `${d.getHours().toString().padStart(2, "0")}:${d
.getMinutes()
.toString()
.padStart(2, "0")}:${d
.getSeconds()
.toString()
.padStart(2, "0")}.${d.getMilliseconds().toString().padStart(3, "0")}`;
return `${day}T${time}Z`;
}
function generateMd5Hash(bytes: Buffer): string {
const hash = crypto.createHash("md5");
hash.update(bytes);
return hash.digest("base64");
}