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subscription.ts
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subscription.ts
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
import { GraphQLResult, GRAPHQL_AUTH_MODE } from '@aws-amplify/api';
import { InternalAPI } from '@aws-amplify/api/internals';
import { Auth } from '@aws-amplify/auth';
import { Cache } from '@aws-amplify/cache';
import {
Category,
ConsoleLogger as Logger,
CustomUserAgentDetails,
DataStoreAction,
Hub,
HubCapsule,
BackgroundProcessManager,
} from '@aws-amplify/core';
import { CONTROL_MSG as PUBSUB_CONTROL_MSG } from '@aws-amplify/pubsub';
import Observable, { ZenObservable } from 'zen-observable-ts';
import {
InternalSchema,
PersistentModel,
SchemaModel,
SchemaNamespace,
PredicatesGroup,
ModelPredicate,
AuthModeStrategy,
ErrorHandler,
ProcessName,
AmplifyContext,
} from '../../types';
import {
buildSubscriptionGraphQLOperation,
getAuthorizationRules,
getModelAuthModes,
getUserGroupsFromToken,
TransformerMutationType,
getTokenForCustomAuth,
predicateToGraphQLFilter,
dynamicAuthFields,
filterFields,
repeatedFieldInGroup,
countFilterCombinations,
RTFError,
generateRTFRemediation,
} from '../utils';
import { ModelPredicateCreator } from '../../predicates';
import { validatePredicate } from '../../util';
import { getSubscriptionErrorType } from './errorMaps';
const logger = new Logger('DataStore');
export enum CONTROL_MSG {
CONNECTED = 'CONNECTED',
}
export enum USER_CREDENTIALS {
'none',
'unauth',
'auth',
}
type AuthorizationInfo = {
authMode: GRAPHQL_AUTH_MODE;
isOwner: boolean;
ownerField?: string;
ownerValue?: string;
};
class SubscriptionProcessor {
private readonly typeQuery = new WeakMap<
SchemaModel,
[TransformerMutationType, string, string][]
>();
private buffer: [TransformerMutationType, SchemaModel, PersistentModel][] =
[];
private dataObserver!: ZenObservable.Observer<any>;
private runningProcesses = new BackgroundProcessManager();
constructor(
private readonly schema: InternalSchema,
private readonly syncPredicates: WeakMap<
SchemaModel,
ModelPredicate<any> | null
>,
private readonly amplifyConfig: Record<string, any> = {},
private readonly authModeStrategy: AuthModeStrategy,
private readonly errorHandler: ErrorHandler,
private readonly amplifyContext: AmplifyContext = {
Auth,
InternalAPI,
Cache,
}
) {}
private buildSubscription(
namespace: SchemaNamespace,
model: SchemaModel,
transformerMutationType: TransformerMutationType,
userCredentials: USER_CREDENTIALS,
cognitoTokenPayload: { [field: string]: any } | undefined,
oidcTokenPayload: { [field: string]: any } | undefined,
authMode: GRAPHQL_AUTH_MODE,
filterArg: boolean = false
): {
opType: TransformerMutationType;
opName: string;
query: string;
authMode: GRAPHQL_AUTH_MODE;
isOwner: boolean;
ownerField?: string;
ownerValue?: string;
} {
const { aws_appsync_authenticationType } = this.amplifyConfig;
const { isOwner, ownerField, ownerValue } =
this.getAuthorizationInfo(
model,
userCredentials,
aws_appsync_authenticationType,
cognitoTokenPayload,
oidcTokenPayload,
authMode
) || {};
const [opType, opName, query] = buildSubscriptionGraphQLOperation(
namespace,
model,
transformerMutationType,
isOwner,
ownerField!,
filterArg
);
return { authMode, opType, opName, query, isOwner, ownerField, ownerValue };
}
private getAuthorizationInfo(
model: SchemaModel,
userCredentials: USER_CREDENTIALS,
defaultAuthType: GRAPHQL_AUTH_MODE,
cognitoTokenPayload: { [field: string]: any } = {},
oidcTokenPayload: { [field: string]: any } = {},
authMode: GRAPHQL_AUTH_MODE
): AuthorizationInfo {
const rules = getAuthorizationRules(model);
// Return null if user doesn't have proper credentials for private API with IAM auth
const iamPrivateAuth =
authMode === GRAPHQL_AUTH_MODE.AWS_IAM &&
rules.find(
rule => rule.authStrategy === 'private' && rule.provider === 'iam'
);
if (iamPrivateAuth && userCredentials === USER_CREDENTIALS.unauth) {
return null!;
}
// Group auth should take precedence over owner auth, so we are checking
// if rule(s) have group authorization as well as if either the Cognito or
// OIDC token has a groupClaim. If so, we are returning auth info before
// any further owner-based auth checks.
const groupAuthRules = rules.filter(
rule =>
rule.authStrategy === 'groups' &&
['userPools', 'oidc'].includes(rule.provider)
);
const validGroup =
(authMode === GRAPHQL_AUTH_MODE.AMAZON_COGNITO_USER_POOLS ||
authMode === GRAPHQL_AUTH_MODE.OPENID_CONNECT) &&
groupAuthRules.find(groupAuthRule => {
// validate token against groupClaim
const cognitoUserGroups = getUserGroupsFromToken(
cognitoTokenPayload,
groupAuthRule
);
const oidcUserGroups = getUserGroupsFromToken(
oidcTokenPayload,
groupAuthRule
);
return [...cognitoUserGroups, ...oidcUserGroups].find(userGroup => {
return groupAuthRule.groups.find(group => group === userGroup);
});
});
if (validGroup) {
return {
authMode,
isOwner: false,
};
}
// Owner auth needs additional values to be returned in order to create the subscription with
// the correct parameters so we are getting the owner value from the Cognito token via the
// identityClaim from the auth rule.
const cognitoOwnerAuthRules =
authMode === GRAPHQL_AUTH_MODE.AMAZON_COGNITO_USER_POOLS
? rules.filter(
rule =>
rule.authStrategy === 'owner' && rule.provider === 'userPools'
)
: [];
let ownerAuthInfo: AuthorizationInfo;
cognitoOwnerAuthRules.forEach(ownerAuthRule => {
const ownerValue = cognitoTokenPayload[ownerAuthRule.identityClaim];
// AuthZ for "list of owners" is handled dynamically in the subscription auth request
// resolver. It doesn't rely on a subscription arg.
// Only pass a subscription arg for single owner auth
const singleOwner =
model.fields[ownerAuthRule.ownerField]?.isArray !== true;
const isOwnerArgRequired =
singleOwner && !ownerAuthRule.areSubscriptionsPublic;
if (ownerValue) {
ownerAuthInfo = {
authMode: GRAPHQL_AUTH_MODE.AMAZON_COGNITO_USER_POOLS,
isOwner: isOwnerArgRequired,
ownerField: ownerAuthRule.ownerField,
ownerValue,
};
}
});
if (ownerAuthInfo!) {
return ownerAuthInfo!;
}
// Owner auth needs additional values to be returned in order to create the subscription with
// the correct parameters so we are getting the owner value from the OIDC token via the
// identityClaim from the auth rule.
const oidcOwnerAuthRules =
authMode === GRAPHQL_AUTH_MODE.OPENID_CONNECT
? rules.filter(
rule => rule.authStrategy === 'owner' && rule.provider === 'oidc'
)
: [];
oidcOwnerAuthRules.forEach(ownerAuthRule => {
const ownerValue = oidcTokenPayload[ownerAuthRule.identityClaim];
const singleOwner =
model.fields[ownerAuthRule.ownerField]?.isArray !== true;
const isOwnerArgRequired =
singleOwner && !ownerAuthRule.areSubscriptionsPublic;
if (ownerValue) {
ownerAuthInfo = {
authMode: GRAPHQL_AUTH_MODE.OPENID_CONNECT,
isOwner: isOwnerArgRequired,
ownerField: ownerAuthRule.ownerField,
ownerValue,
};
}
});
if (ownerAuthInfo!) {
return ownerAuthInfo!;
}
// Fallback: return authMode or default auth type
return {
authMode: authMode || defaultAuthType,
isOwner: false,
};
}
private hubQueryCompletionListener(completed: Function, capsule: HubCapsule) {
const {
payload: { event },
} = capsule;
if (event === PUBSUB_CONTROL_MSG.SUBSCRIPTION_ACK) {
completed();
}
}
start(): [
Observable<CONTROL_MSG>,
Observable<[TransformerMutationType, SchemaModel, PersistentModel]>
] {
this.runningProcesses =
this.runningProcesses || new BackgroundProcessManager();
const ctlObservable = new Observable<CONTROL_MSG>(observer => {
const promises: Promise<void>[] = [];
// Creating subs for each model/operation combo so they can be unsubscribed
// independently, since the auth retry behavior is asynchronous.
let subscriptions: {
[modelName: string]: {
[TransformerMutationType.CREATE]: ZenObservable.Subscription[];
[TransformerMutationType.UPDATE]: ZenObservable.Subscription[];
[TransformerMutationType.DELETE]: ZenObservable.Subscription[];
};
} = {};
let cognitoTokenPayload: { [field: string]: any },
oidcTokenPayload: { [field: string]: any };
let userCredentials = USER_CREDENTIALS.none;
this.runningProcesses.add(async () => {
try {
// retrieving current AWS Credentials
const credentials =
await this.amplifyContext.Auth.currentCredentials();
userCredentials = credentials.authenticated
? USER_CREDENTIALS.auth
: USER_CREDENTIALS.unauth;
} catch (err) {
// best effort to get AWS credentials
}
try {
// retrieving current token info from Cognito UserPools
const session = await this.amplifyContext.Auth.currentSession();
cognitoTokenPayload = session.getIdToken().decodePayload();
} catch (err) {
// best effort to get jwt from Cognito
}
try {
// Checking for the Cognito region in config to see if Auth is configured
// before attempting to get federated token. We're using the Cognito region
// because it will be there regardless of user/identity pool being present.
const { aws_cognito_region, Auth: AuthConfig } = this.amplifyConfig;
if (!aws_cognito_region || (AuthConfig && !AuthConfig.region)) {
throw 'Auth is not configured';
}
let token;
// backwards compatibility
const federatedInfo = await this.amplifyContext.Cache.getItem(
'federatedInfo'
);
if (federatedInfo) {
token = federatedInfo.token;
} else {
const currentUser =
await this.amplifyContext.Auth.currentAuthenticatedUser();
if (currentUser) {
token = currentUser.token;
}
}
if (token) {
const payload = token.split('.')[1];
oidcTokenPayload = JSON.parse(
Buffer.from(payload, 'base64').toString('utf8')
);
}
} catch (err) {
logger.debug('error getting OIDC JWT', err);
// best effort to get oidc jwt
}
Object.values(this.schema.namespaces).forEach(namespace => {
Object.values(namespace.models)
.filter(({ syncable }) => syncable)
.forEach(
modelDefinition =>
this.runningProcesses.isOpen &&
this.runningProcesses.add(async () => {
const modelAuthModes = await getModelAuthModes({
authModeStrategy: this.authModeStrategy,
defaultAuthMode:
this.amplifyConfig.aws_appsync_authenticationType,
modelName: modelDefinition.name,
schema: this.schema,
});
// subscriptions are created only based on the READ auth mode(s)
const readAuthModes = modelAuthModes.READ;
subscriptions = {
...subscriptions,
[modelDefinition.name]: {
[TransformerMutationType.CREATE]: [],
[TransformerMutationType.UPDATE]: [],
[TransformerMutationType.DELETE]: [],
},
};
const operations = [
TransformerMutationType.CREATE,
TransformerMutationType.UPDATE,
TransformerMutationType.DELETE,
];
const operationAuthModeAttempts = {
[TransformerMutationType.CREATE]: 0,
[TransformerMutationType.UPDATE]: 0,
[TransformerMutationType.DELETE]: 0,
};
const predicatesGroup = ModelPredicateCreator.getPredicates(
this.syncPredicates.get(modelDefinition)!,
false
);
const addFilterArg = predicatesGroup !== undefined;
// Retry subscriptions that failed for one of the following reasons:
// 1. unauthorized - retry with next auth mode (if available)
// 2. RTF error - retry without sending filter arg. (filtering will fall back to clientside)
const subscriptionRetry = async (
operation,
addFilter = addFilterArg
) => {
const {
opType: transformerMutationType,
opName,
query,
isOwner,
ownerField,
ownerValue,
authMode,
} = this.buildSubscription(
namespace,
modelDefinition,
operation,
userCredentials,
cognitoTokenPayload,
oidcTokenPayload,
readAuthModes[operationAuthModeAttempts[operation]],
addFilter
);
const authToken = await getTokenForCustomAuth(
authMode,
this.amplifyConfig
);
const variables = {};
const customUserAgentDetails: CustomUserAgentDetails = {
category: Category.DataStore,
action: DataStoreAction.Subscribe,
};
if (addFilter && predicatesGroup) {
variables['filter'] =
predicateToGraphQLFilter(predicatesGroup);
}
if (isOwner) {
if (!ownerValue) {
observer.error(
'Owner field required, sign in is needed in order to perform this operation'
);
return;
}
variables[ownerField!] = ownerValue;
}
logger.debug(
`Attempting ${operation} subscription with authMode: ${
readAuthModes[operationAuthModeAttempts[operation]]
}`
);
const queryObservable = <
Observable<{
value: GraphQLResult<Record<string, PersistentModel>>;
}>
>(<unknown>this.amplifyContext.InternalAPI.graphql(
{
query,
variables,
...{ authMode },
authToken,
},
undefined,
customUserAgentDetails
));
let subscriptionReadyCallback: () => void;
// TODO: consider onTerminate.then(() => API.cancel(...))
subscriptions[modelDefinition.name][
transformerMutationType
].push(
queryObservable
.map(({ value }) => {
return value;
})
.subscribe({
next: ({ data, errors }) => {
if (Array.isArray(errors) && errors.length > 0) {
const messages = (<
{
message: string;
}[]
>errors).map(({ message }) => message);
logger.warn(
`Skipping incoming subscription. Messages: ${messages.join(
'\n'
)}`
);
this.drainBuffer();
return;
}
const predicatesGroup =
ModelPredicateCreator.getPredicates(
this.syncPredicates.get(modelDefinition)!,
false
);
// @ts-ignore
const { [opName]: record } = data;
// checking incoming subscription against syncPredicate.
// once AppSync implements filters on subscriptions, we'll be
// able to set these when establishing the subscription instead.
// Until then, we'll need to filter inbound
if (
this.passesPredicateValidation(
record,
predicatesGroup!
)
) {
this.pushToBuffer(
transformerMutationType,
modelDefinition,
record
);
}
this.drainBuffer();
},
error: async subscriptionError => {
const {
error: { errors: [{ message = '' } = {}] } = {
errors: [],
},
} = subscriptionError;
const isRTFError =
// only attempt catch if a filter variable was added to the subscription query
addFilter &&
this.catchRTFError(
message,
modelDefinition,
predicatesGroup
);
// Catch RTF errors
if (isRTFError) {
// Unsubscribe and clear subscription array for model/operation
subscriptions[modelDefinition.name][
transformerMutationType
].forEach(subscription =>
subscription.unsubscribe()
);
subscriptions[modelDefinition.name][
transformerMutationType
] = [];
// retry subscription connection without filter
subscriptionRetry(operation, false);
return;
}
if (
message.includes(
PUBSUB_CONTROL_MSG.REALTIME_SUBSCRIPTION_INIT_ERROR
) ||
message.includes(
PUBSUB_CONTROL_MSG.CONNECTION_FAILED
)
) {
// Unsubscribe and clear subscription array for model/operation
subscriptions[modelDefinition.name][
transformerMutationType
].forEach(subscription =>
subscription.unsubscribe()
);
subscriptions[modelDefinition.name][
transformerMutationType
] = [];
operationAuthModeAttempts[operation]++;
if (
operationAuthModeAttempts[operation] >=
readAuthModes.length
) {
// last auth mode retry. Continue with error
logger.debug(
`${operation} subscription failed with authMode: ${
readAuthModes[
operationAuthModeAttempts[operation] - 1
]
}`
);
} else {
// retry with different auth mode. Do not trigger
// observer error or error handler
logger.debug(
`${operation} subscription failed with authMode: ${
readAuthModes[
operationAuthModeAttempts[operation] - 1
]
}. Retrying with authMode: ${
readAuthModes[
operationAuthModeAttempts[operation]
]
}`
);
subscriptionRetry(operation);
return;
}
}
logger.warn('subscriptionError', message);
try {
await this.errorHandler({
recoverySuggestion:
'Ensure app code is up to date, auth directives exist and are correct on each model, and that server-side data has not been invalidated by a schema change. If the problem persists, search for or create an issue: https://github.com/aws-amplify/amplify-js/issues',
localModel: null!,
message,
model: modelDefinition.name,
operation,
errorType:
getSubscriptionErrorType(subscriptionError),
process: ProcessName.subscribe,
remoteModel: null!,
cause: subscriptionError,
});
} catch (e) {
logger.error(
'Subscription error handler failed with:',
e
);
}
if (
typeof subscriptionReadyCallback === 'function'
) {
subscriptionReadyCallback();
}
if (
message.includes('"errorType":"Unauthorized"') ||
message.includes(
'"errorType":"OperationDisabled"'
)
) {
return;
}
observer.error(message);
},
})
);
promises.push(
(async () => {
let boundFunction: any;
await new Promise(res => {
subscriptionReadyCallback = res;
boundFunction = this.hubQueryCompletionListener.bind(
this,
res
);
Hub.listen('api', boundFunction);
});
Hub.remove('api', boundFunction);
})()
);
};
operations.forEach(op => subscriptionRetry(op));
})
);
});
this.runningProcesses.isOpen &&
this.runningProcesses.add(() =>
Promise.all(promises).then(() => {
observer.next(CONTROL_MSG.CONNECTED);
})
);
}, 'subscription processor new subscriber');
return this.runningProcesses.addCleaner(async () => {
Object.keys(subscriptions).forEach(modelName => {
subscriptions[modelName][TransformerMutationType.CREATE].forEach(
subscription => subscription.unsubscribe()
);
subscriptions[modelName][TransformerMutationType.UPDATE].forEach(
subscription => subscription.unsubscribe()
);
subscriptions[modelName][TransformerMutationType.DELETE].forEach(
subscription => subscription.unsubscribe()
);
});
});
});
const dataObservable = new Observable<
[TransformerMutationType, SchemaModel, PersistentModel]
>(observer => {
this.dataObserver = observer;
this.drainBuffer();
return this.runningProcesses.addCleaner(async () => {
this.dataObserver = null!;
});
});
return [ctlObservable, dataObservable];
}
public async stop() {
await this.runningProcesses.close();
await this.runningProcesses.open();
}
private passesPredicateValidation(
record: PersistentModel,
predicatesGroup: PredicatesGroup<any>
): boolean {
if (!predicatesGroup) {
return true;
}
const { predicates, type } = predicatesGroup;
return validatePredicate(record, type, predicates);
}
private pushToBuffer(
transformerMutationType: TransformerMutationType,
modelDefinition: SchemaModel,
data: PersistentModel
) {
this.buffer.push([transformerMutationType, modelDefinition, data]);
}
private drainBuffer() {
if (this.dataObserver) {
this.buffer.forEach(data => this.dataObserver.next!(data));
this.buffer = [];
}
}
/**
* @returns true if the service returned an RTF subscription error
* @remarks logs a warning with remediation instructions
*
*/
private catchRTFError(
message: string,
modelDefinition: SchemaModel,
predicatesGroup: PredicatesGroup<any> | undefined
): boolean {
const header =
'Backend subscriptions filtering error.\n' +
'Subscriptions filtering will be applied clientside.\n';
const messageErrorTypeMap = {
'UnknownArgument: Unknown field argument filter': RTFError.UnknownField,
'Filters exceed maximum attributes limit': RTFError.MaxAttributes,
'Filters combination exceed maximum limit': RTFError.MaxCombinations,
'filter uses same fieldName multiple time': RTFError.RepeatedFieldname,
"The variables input contains a field name 'not'": RTFError.NotGroup,
'The variables input contains a field that is not defined for input object type':
RTFError.FieldNotInType,
};
const [_errorMsg, errorType] =
Object.entries(messageErrorTypeMap).find(([errorMsg]) =>
message.includes(errorMsg)
) || [];
if (errorType !== undefined) {
const remediationMessage = generateRTFRemediation(
errorType,
modelDefinition,
predicatesGroup
);
logger.warn(`${header}\n${message}\n${remediationMessage}`);
return true;
}
return false;
}
}
export { SubscriptionProcessor };