gristlabs_grist-core/app/server/lib/DocApi.ts
Alex Hall 2c9ae6dc94 (core) Enforce daily limit on API usage
Summary:
Keep track of the number of API requests made for this document today in redis. Uses local caches of the count and the document so that usually requests can proceed without waiting for redis or the database.

Moved the free standing function apiThrottle to become a method to avoid adding another layer of request handler callbacks.

Test Plan: Added a DocApi test

Reviewers: paulfitz

Reviewed By: paulfitz

Subscribers: dsagal

Differential Revision: https://phab.getgrist.com/D3327
2022-03-22 00:22:45 +02:00

1116 lines
48 KiB
TypeScript

import { createEmptyActionSummary } from "app/common/ActionSummary";
import { ApiError } from 'app/common/ApiError';
import { BrowserSettings } from "app/common/BrowserSettings";
import {
BulkColValues, ColValues, fromTableDataAction, TableColValues, TableRecordValue,
} from 'app/common/DocActions';
import {isRaisedException} from "app/common/gristTypes";
import { isAffirmative } from "app/common/gutil";
import { SortFunc } from 'app/common/SortFunc';
import { DocReplacementOptions, DocState, DocStateComparison, DocStates, NEW_DOCUMENT_CODE} from 'app/common/UserAPI';
import GristDataTI from 'app/plugin/GristData-ti';
import { HomeDBManager, makeDocAuthResult } from 'app/gen-server/lib/HomeDBManager';
import { OpOptions } from "app/plugin/TableOperations";
import { handleSandboxErrorOnPlatform, TableOperationsImpl,
TableOperationsPlatform } from 'app/plugin/TableOperationsImpl';
import { concatenateSummaries, summarizeAction } from "app/server/lib/ActionSummary";
import { ActiveDoc, tableIdToRef } from "app/server/lib/ActiveDoc";
import { assertAccess, getOrSetDocAuth, getTransitiveHeaders, getUserId, isAnonymousUser,
RequestWithLogin } from 'app/server/lib/Authorizer';
import { DocManager } from "app/server/lib/DocManager";
import { docSessionFromRequest, makeExceptionalDocSession, OptDocSession } from "app/server/lib/DocSession";
import { DocWorker } from "app/server/lib/DocWorker";
import { IDocWorkerMap } from "app/server/lib/DocWorkerMap";
import { parseExportParameters } from "app/server/lib/Export";
import { downloadCSV, DownloadCSVOptions } from "app/server/lib/ExportCSV";
import { downloadXLSX, DownloadXLSXOptions } from "app/server/lib/ExportXLSX";
import { expressWrap } from 'app/server/lib/expressWrap';
import { filterDocumentInPlace } from "app/server/lib/filterUtils";
import { googleAuthTokenMiddleware } from "app/server/lib/GoogleAuth";
import { exportToDrive } from "app/server/lib/GoogleExport";
import { GristServer } from 'app/server/lib/GristServer';
import { HashUtil } from 'app/server/lib/HashUtil';
import { makeForkIds } from "app/server/lib/idUtils";
import {
getDocId, getDocScope, integerParam, isParameterOn, optStringParam,
sendOkReply, sendReply, stringParam } from 'app/server/lib/requestUtils';
import {localeFromRequest} from "app/server/lib/ServerLocale";
import {allowedEventTypes, isUrlAllowed, WebhookAction, WebHookSecret} from "app/server/lib/Triggers";
import { handleOptionalUpload, handleUpload } from "app/server/lib/uploads";
import DocApiTypesTI from "app/plugin/DocApiTypes-ti";
import * as Types from "app/plugin/DocApiTypes";
import * as contentDisposition from 'content-disposition';
import { Application, NextFunction, Request, RequestHandler, Response } from "express";
import * as _ from "lodash";
import * as LRUCache from 'lru-cache';
import fetch from 'node-fetch';
import * as path from 'path';
import * as uuidv4 from "uuid/v4";
import * as t from "ts-interface-checker";
import { Checker } from "ts-interface-checker";
import { ServerColumnGetters } from 'app/server/lib/ServerColumnGetters';
import { Sort } from 'app/common/SortSpec';
// Cap on the number of requests that can be outstanding on a single document via the
// rest doc api. When this limit is exceeded, incoming requests receive an immediate
// reply with status 429.
const MAX_PARALLEL_REQUESTS_PER_DOC = 10;
type WithDocHandler = (activeDoc: ActiveDoc, req: RequestWithLogin, resp: Response) => Promise<void>;
// Schema validators for api endpoints that creates or updates records.
const {RecordsPatch, RecordsPost, RecordsPut} = t.createCheckers(DocApiTypesTI, GristDataTI);
RecordsPatch.setReportedPath("body");
RecordsPost.setReportedPath("body");
RecordsPut.setReportedPath("body");
/**
* Middleware for validating request's body with a Checker instance.
*/
function validate(checker: Checker): RequestHandler {
return (req, res, next) => {
try {
checker.check(req.body);
} catch(err) {
res.status(400).json({
error : "Invalid payload",
details: String(err)
}).end();
return;
}
next();
};
}
export class DocWorkerApi {
constructor(private _app: Application, private _docWorker: DocWorker,
private _docWorkerMap: IDocWorkerMap, private _docManager: DocManager,
private _dbManager: HomeDBManager, private _grist: GristServer) {}
/**
* Adds endpoints for the doc api.
*
* Note that it expects bodyParser, userId, and jsonErrorHandler middleware to be set up outside
* to apply to these routes.
*/
public addEndpoints() {
// check document exists (not soft deleted) and user can view it
const canView = expressWrap(this._assertAccess.bind(this, 'viewers', false));
// check document exists (not soft deleted) and user can edit it
const canEdit = expressWrap(this._assertAccess.bind(this, 'editors', false));
const isOwner = expressWrap(this._assertAccess.bind(this, 'owners', false));
// check user can edit document, with soft-deleted documents being acceptable
const canEditMaybeRemoved = expressWrap(this._assertAccess.bind(this, 'editors', true));
// converts google code to access token and adds it to request object
const decodeGoogleToken = expressWrap(googleAuthTokenMiddleware.bind(null));
// Middleware to limit number of outstanding requests per document. Will also
// handle errors like expressWrap would.
const throttled = this._apiThrottle.bind(this);
const withDoc = (callback: WithDocHandler) => throttled(this._requireActiveDoc(callback));
// Apply user actions to a document.
this._app.post('/api/docs/:docId/apply', canEdit, withDoc(async (activeDoc, req, res) => {
const parseStrings = !isAffirmative(req.query.noparse);
res.json(await activeDoc.applyUserActions(docSessionFromRequest(req), req.body, {parseStrings}));
}));
async function getTableData(activeDoc: ActiveDoc, req: RequestWithLogin) {
const filters = req.query.filter ? JSON.parse(String(req.query.filter)) : {};
// Option to skip waiting for document initialization.
const immediate = isAffirmative(req.query.immediate);
if (!Object.keys(filters).every(col => Array.isArray(filters[col]))) {
throw new ApiError("Invalid query: filter values must be arrays", 400);
}
const tableId = req.params.tableId;
const session = docSessionFromRequest(req);
const tableData = await handleSandboxError(tableId, [], activeDoc.fetchQuery(
session, {tableId, filters}, !immediate));
// For metaTables we don't need to specify columns, search will infer it from the sort expression.
const isMetaTable = tableId.startsWith('_grist');
const columns = isMetaTable ? null :
await handleSandboxError('', [], activeDoc.getTableCols(session, tableId, true));
const params = getQueryParameters(req);
// Apply sort/limit parameters, if set. TODO: move sorting/limiting into data engine
// and sql.
return applyQueryParameters(fromTableDataAction(tableData), params, columns);
}
// Get the specified table in column-oriented format
this._app.get('/api/docs/:docId/tables/:tableId/data', canView,
withDoc(async (activeDoc, req, res) => {
res.json(await getTableData(activeDoc, req));
})
);
// Get the specified table in record-oriented format
this._app.get('/api/docs/:docId/tables/:tableId/records', canView,
withDoc(async (activeDoc, req, res) => {
const columnData = await getTableData(activeDoc, req);
const fieldNames = Object.keys(columnData)
.filter(k => !(
["id", "manualSort"].includes(k)
|| k.startsWith("gristHelper_")
));
const records = columnData.id.map((id, index) => {
const result: TableRecordValue = {id, fields: {}};
for (const key of fieldNames) {
let value = columnData[key][index];
if (isRaisedException(value)) {
_.set(result, ["errors", key], (value as string[])[1]);
value = null;
}
result.fields[key] = value;
}
return result;
});
res.json({records});
})
);
async function getMetaTables(activeDoc: ActiveDoc, req: RequestWithLogin) {
return await handleSandboxError("", [],
activeDoc.fetchMetaTables(docSessionFromRequest(req)));
}
// Get the columns of the specified table in recordish format
this._app.get('/api/docs/:docId/tables/:tableId/columns', canView,
withDoc(async (activeDoc, req, res) => {
const tableId = req.params.tableId;
const columns = await handleSandboxError('', [],
activeDoc.getTableCols(docSessionFromRequest(req), tableId));
res.json({columns});
})
);
// The upload should be a multipart post with an 'upload' field containing one or more files.
// Returns the list of rowIds for the rows created in the _grist_Attachments table.
this._app.post('/api/docs/:docId/attachments', canEdit, withDoc(async (activeDoc, req, res) => {
const uploadResult = await handleUpload(req, res);
res.json(await activeDoc.addAttachments(docSessionFromRequest(req), uploadResult.uploadId));
}));
// Returns the metadata for a given attachment ID (i.e. a rowId in _grist_Attachments table).
this._app.get('/api/docs/:docId/attachments/:attId', canView, withDoc(async (activeDoc, req, res) => {
const attRecord = activeDoc.getAttachmentMetadata(req.params.attId as string);
const {fileName, fileSize, timeUploaded: t} = attRecord;
const timeUploaded = (typeof t === 'number') ? new Date(t).toISOString() : undefined;
res.json({fileName, fileSize, timeUploaded});
}));
// Responds with attachment contents, with suitable Content-Type and Content-Disposition.
this._app.get('/api/docs/:docId/attachments/:attId/download', canView, withDoc(async (activeDoc, req, res) => {
const attRecord = activeDoc.getAttachmentMetadata(req.params.attId as string);
const fileIdent = attRecord.fileIdent as string;
const ext = path.extname(fileIdent);
const origName = attRecord.fileName as string;
const fileName = ext ? path.basename(origName, path.extname(origName)) + ext : origName;
const fileData = await activeDoc.getAttachmentData(docSessionFromRequest(req), fileIdent);
res.status(200)
.type(ext)
// Construct a content-disposition header of the form 'attachment; filename="NAME"'
.set('Content-Disposition', contentDisposition(fileName, {type: 'attachment'}))
.set('Cache-Control', 'private, max-age=3600')
.send(fileData);
}));
// Adds records given in a column oriented format,
// returns an array of row IDs
this._app.post('/api/docs/:docId/tables/:tableId/data', canEdit,
withDoc(async (activeDoc, req, res) => {
const colValues = req.body as BulkColValues;
const count = colValues[Object.keys(colValues)[0]].length;
const op = getTableOperations(req, activeDoc);
const ids = await op.addRecords(count, colValues);
res.json(ids);
})
);
// Adds records given in a record oriented format,
// returns in the same format as GET /records but without the fields object for now
this._app.post('/api/docs/:docId/tables/:tableId/records', canEdit, validate(RecordsPost),
withDoc(async (activeDoc, req, res) => {
const body = req.body as Types.RecordsPost;
const ops = getTableOperations(req, activeDoc);
const records = await ops.create(body.records);
res.json({records});
})
);
this._app.post('/api/docs/:docId/tables/:tableId/data/delete', canEdit, withDoc(async (activeDoc, req, res) => {
const rowIds = req.body;
const op = getTableOperations(req, activeDoc);
res.json(await op.destroy(rowIds));
}));
// Download full document
// TODO: look at download behavior if ActiveDoc is shutdown during call (cannot
// use withDoc wrapper)
this._app.get('/api/docs/:docId/download', canView, throttled(async (req, res) => {
// We want to be have a way download broken docs that ActiveDoc may not be able
// to load. So, if the user owns the document, we unconditionally let them
// download.
if (await this._isOwner(req)) {
try {
// We carefully avoid creating an ActiveDoc for the document being downloaded,
// in case it is broken in some way. It is convenient to be able to download
// broken files for diagnosis/recovery.
return await this._docWorker.downloadDoc(req, res, this._docManager.storageManager);
} catch (e) {
if (e.message && e.message.match(/does not exist yet/)) {
// The document has never been seen on file system / s3. It may be new, so
// we try again after having created an ActiveDoc for the document.
await this._getActiveDoc(req);
return this._docWorker.downloadDoc(req, res, this._docManager.storageManager);
} else {
throw e;
}
}
} else {
// If the user is not an owner, we load the document as an ActiveDoc, and then
// check if the user has download permissions.
const activeDoc = await this._getActiveDoc(req);
if (!await activeDoc.canDownload(docSessionFromRequest(req))) {
throw new ApiError('not authorized to download this document', 403);
}
return this._docWorker.downloadDoc(req, res, this._docManager.storageManager);
}
}));
// Fork the specified document.
this._app.post('/api/docs/:docId/fork', canView, withDoc(async (activeDoc, req, res) => {
const result = await activeDoc.fork(docSessionFromRequest(req));
res.json(result);
}));
// Initiate a fork. Used internally to implement ActiveDoc.fork. Only usable via a Permit.
this._app.post('/api/docs/:docId/create-fork', canEdit, throttled(async (req, res) => {
const docId = stringParam(req.params.docId, 'docId');
const srcDocId = stringParam(req.body.srcDocId, 'srcDocId');
if (srcDocId !== req.specialPermit?.otherDocId) { throw new Error('access denied'); }
const fname = await this._docManager.storageManager.prepareFork(srcDocId, docId);
await filterDocumentInPlace(docSessionFromRequest(req), fname);
res.json({srcDocId, docId});
}));
// Update records given in column format
// The records to update are identified by their id column.
this._app.patch('/api/docs/:docId/tables/:tableId/data', canEdit,
withDoc(async (activeDoc, req, res) => {
const columnValues = req.body;
const rowIds = columnValues.id;
// sandbox expects no id column
delete columnValues.id;
const ops = getTableOperations(req, activeDoc);
await ops.updateRecords(columnValues, rowIds);
res.json(null);
})
);
// Update records given in records format
this._app.patch('/api/docs/:docId/tables/:tableId/records', canEdit, validate(RecordsPatch),
withDoc(async (activeDoc, req, res) => {
const body = req.body as Types.RecordsPatch;
const ops = getTableOperations(req, activeDoc);
await ops.update(body.records);
res.json(null);
})
);
// Add or update records given in records format
this._app.put('/api/docs/:docId/tables/:tableId/records', canEdit, validate(RecordsPut),
withDoc(async (activeDoc, req, res) => {
const ops = getTableOperations(req, activeDoc);
const body = req.body as Types.RecordsPut;
const options = {
add: !isAffirmative(req.query.noadd),
update: !isAffirmative(req.query.noupdate),
onMany: stringParam(req.query.onmany || "first", "onmany",
["first", "none", "all"]) as 'first'|'none'|'all'|undefined,
allowEmptyRequire: isAffirmative(req.query.allow_empty_require),
};
await ops.upsert(body.records, options);
res.json(null);
})
);
// Add a new webhook and trigger
this._app.post('/api/docs/:docId/tables/:tableId/_subscribe', isOwner,
withDoc(async (activeDoc, req, res) => {
const {isReadyColumn, eventTypes, url} = req.body;
if (!(Array.isArray(eventTypes) && eventTypes.length)) {
throw new ApiError(`eventTypes must be a non-empty array`, 400);
}
if (!eventTypes.every(allowedEventTypes.guard)) {
throw new ApiError(`Allowed values in eventTypes are: ${allowedEventTypes.values}`, 400);
}
if (!url) {
throw new ApiError('Bad request: url required', 400);
}
if (!isUrlAllowed(url)) {
throw new ApiError('Provided url is forbidden', 403);
}
const metaTables = await getMetaTables(activeDoc, req);
const tableRef = tableIdToRef(metaTables, req.params.tableId);
let isReadyColRef = 0;
if (isReadyColumn) {
const [, , colRefs, columnData] = metaTables._grist_Tables_column;
const colRowIndex = columnData.colId.indexOf(isReadyColumn);
if (colRowIndex === -1) {
throw new ApiError(`Column not found "${isReadyColumn}"`, 404);
}
isReadyColRef = colRefs[colRowIndex];
}
const unsubscribeKey = uuidv4();
const webhook: WebHookSecret = {unsubscribeKey, url};
const secretValue = JSON.stringify(webhook);
const webhookId = (await this._dbManager.addSecret(secretValue, activeDoc.docName)).id;
const webhookAction: WebhookAction = {type: "webhook", id: webhookId};
const sandboxRes = await handleSandboxError("_grist_Triggers", [], activeDoc.applyUserActions(
docSessionFromRequest(req),
[['AddRecord', "_grist_Triggers", null, {
tableRef,
isReadyColRef,
eventTypes: ["L", ...eventTypes],
actions: JSON.stringify([webhookAction])
}]]));
res.json({
unsubscribeKey,
triggerId: sandboxRes.retValues[0],
webhookId,
});
})
);
// Remove webhook and trigger created above
this._app.post('/api/docs/:docId/tables/:tableId/_unsubscribe', canEdit,
withDoc(async (activeDoc, req, res) => {
const metaTables = await getMetaTables(activeDoc, req);
const tableRef = tableIdToRef(metaTables, req.params.tableId);
const {triggerId, unsubscribeKey, webhookId} = req.body;
// Validate combination of triggerId, webhookId, and tableRef.
// This is overly strict, webhookId should be enough,
// but it should be easy to relax that later if we want.
const [, , triggerRowIds, triggerColData] = metaTables._grist_Triggers;
const triggerRowIndex = triggerRowIds.indexOf(triggerId);
if (triggerRowIndex === -1) {
throw new ApiError(`Trigger not found "${triggerId}"`, 404);
}
if (triggerColData.tableRef[triggerRowIndex] !== tableRef) {
throw new ApiError(`Wrong table`, 400);
}
const actions = JSON.parse(triggerColData.actions[triggerRowIndex] as string);
if (!_.find(actions, {type: "webhook", id: webhookId})) {
throw new ApiError(`Webhook not found "${webhookId}"`, 404);
}
// Validate unsubscribeKey before deleting trigger from document
await this._dbManager.removeWebhook(webhookId, activeDoc.docName, unsubscribeKey);
// TODO handle trigger containing other actions when that becomes possible
await handleSandboxError("_grist_Triggers", [], activeDoc.applyUserActions(
docSessionFromRequest(req),
[['RemoveRecord', "_grist_Triggers", triggerId]]));
res.json({success: true});
})
);
// Reload a document forcibly (in fact this closes the doc, it will be automatically
// reopened on use).
this._app.post('/api/docs/:docId/force-reload', canEdit, throttled(async (req, res) => {
const activeDoc = await this._getActiveDoc(req);
await activeDoc.reloadDoc();
res.json(null);
}));
this._app.post('/api/docs/:docId/recover', canEdit, throttled(async (req, res) => {
const recoveryModeRaw = req.body.recoveryMode;
const recoveryMode = (typeof recoveryModeRaw === 'boolean') ? recoveryModeRaw : undefined;
if (!await this._isOwner(req)) { throw new Error('Only owners can control recovery mode'); }
const activeDoc = await this._docManager.fetchDoc(docSessionFromRequest(req), getDocId(req), recoveryMode);
res.json({
recoveryMode: activeDoc.recoveryMode
});
}));
// DELETE /api/docs/:docId
// Delete the specified doc.
this._app.delete('/api/docs/:docId', canEditMaybeRemoved, throttled(async (req, res) => {
await this._removeDoc(req, res, true);
}));
// POST /api/docs/:docId/remove
// Soft-delete the specified doc. If query parameter "permanent" is set,
// delete permanently.
this._app.post('/api/docs/:docId/remove', canEditMaybeRemoved, throttled(async (req, res) => {
await this._removeDoc(req, res, isParameterOn(req.query.permanent));
}));
this._app.get('/api/docs/:docId/snapshots', canView, withDoc(async (activeDoc, req, res) => {
const {snapshots} = await activeDoc.getSnapshots(isAffirmative(req.query.raw));
res.json({snapshots});
}));
this._app.post('/api/docs/:docId/snapshots/remove', isOwner, withDoc(async (activeDoc, req, res) => {
const docSession = docSessionFromRequest(req);
const snapshotIds = req.body.snapshotIds as string[];
if (snapshotIds) {
await activeDoc.removeSnapshots(docSession, snapshotIds);
res.json({snapshotIds});
return;
}
if (req.body.select === 'unlisted') {
// Remove any snapshots not listed in inventory. Ideally, there should be no
// snapshots, and this undocumented feature is just for fixing up problems.
const full = (await activeDoc.getSnapshots(true)).snapshots.map(s => s.snapshotId);
const listed = new Set((await activeDoc.getSnapshots()).snapshots.map(s => s.snapshotId));
const unlisted = full.filter(snapshotId => !listed.has(snapshotId));
await activeDoc.removeSnapshots(docSession, unlisted);
res.json({snapshotIds: unlisted});
return;
}
if (req.body.select === 'past') {
// Remove all but the latest snapshot. Useful for sanitizing history if something
// bad snuck into previous snapshots and they are not valuable to preserve.
const past = (await activeDoc.getSnapshots(true)).snapshots.map(s => s.snapshotId);
past.shift(); // remove current version.
await activeDoc.removeSnapshots(docSession, past);
res.json({snapshotIds: past});
return;
}
throw new Error('please specify snapshotIds to remove');
}));
this._app.post('/api/docs/:docId/flush', canEdit, throttled(async (req, res) => {
const activeDocPromise = this._getActiveDocIfAvailable(req);
if (!activeDocPromise) {
// Only need to flush if doc is actually open.
res.json(false);
return;
}
const activeDoc = await activeDocPromise;
await activeDoc.flushDoc();
res.json(true);
}));
// Administrative endpoint, that checks if a document is in the expected group,
// and frees it for reassignment if not. Has no effect if document is in the
// expected group. Does not require specific rights. Returns true if the document
// is freed up for reassignment, otherwise false.
this._app.post('/api/docs/:docId/assign', canEdit, throttled(async (req, res) => {
const docId = getDocId(req);
const status = await this._docWorkerMap.getDocWorker(docId);
if (!status) { res.json(false); return; }
const workerGroup = await this._docWorkerMap.getWorkerGroup(status.docWorker.id);
const docGroup = await this._docWorkerMap.getDocGroup(docId);
if (docGroup === workerGroup) { res.json(false); return; }
const activeDoc = await this._getActiveDoc(req);
await activeDoc.flushDoc();
// flushDoc terminates once there's no pending operation on the document.
// There could still be async operations in progress. We mute their effect,
// as if they never happened.
activeDoc.docClients.interruptAllClients();
activeDoc.setMuted();
await activeDoc.shutdown();
await this._docWorkerMap.releaseAssignment(status.docWorker.id, docId);
res.json(true);
}));
// This endpoint cannot use withDoc since it is expected behavior for the ActiveDoc it
// starts with to become muted.
this._app.post('/api/docs/:docId/replace', canEdit, throttled(async (req, res) => {
const activeDoc = await this._getActiveDoc(req);
const options: DocReplacementOptions = {};
if (req.body.sourceDocId) {
options.sourceDocId = await this._confirmDocIdForRead(req, String(req.body.sourceDocId));
// We should make sure the source document has flushed recently.
// It may not be served by the same worker, so work through the api.
await fetch(this._grist.getHomeUrl(req, `/api/docs/${options.sourceDocId}/flush`), {
method: 'POST',
headers: {
...getTransitiveHeaders(req),
'Content-Type': 'application/json',
}
});
}
if (req.body.snapshotId) {
options.snapshotId = String(req.body.snapshotId);
}
await activeDoc.replace(options);
res.json(null);
}));
this._app.get('/api/docs/:docId/states', canView, withDoc(async (activeDoc, req, res) => {
const docSession = docSessionFromRequest(req);
res.json(await this._getStates(docSession, activeDoc));
}));
this._app.post('/api/docs/:docId/states/remove', isOwner, withDoc(async (activeDoc, req, res) => {
const docSession = docSessionFromRequest(req);
const keep = integerParam(req.body.keep, 'keep');
res.json(await activeDoc.deleteActions(docSession, keep));
}));
this._app.get('/api/docs/:docId/compare/:docId2', canView, withDoc(async (activeDoc, req, res) => {
const showDetails = isAffirmative(req.query.detail);
const docSession = docSessionFromRequest(req);
const {states} = await this._getStates(docSession, activeDoc);
const ref = await fetch(this._grist.getHomeUrl(req, `/api/docs/${req.params.docId2}/states`), {
headers: {
...getTransitiveHeaders(req),
'Content-Type': 'application/json',
}
});
const states2: DocState[] = (await ref.json()).states;
const left = states[0];
const right = states2[0];
if (!left || !right) {
// This should not arise unless there's a bug.
throw new Error('document with no history');
}
const rightHashes = new Set(states2.map(state => state.h));
const parent = states.find(state => rightHashes.has(state.h )) || null;
const leftChanged = parent && parent.h !== left.h;
const rightChanged = parent && parent.h !== right.h;
const summary = leftChanged ? (rightChanged ? 'both' : 'left') :
(rightChanged ? 'right' : (parent ? 'same' : 'unrelated'));
const comparison: DocStateComparison = {
left, right, parent, summary
};
if (showDetails && parent) {
// Calculate changes from the parent to the current version of this document.
const leftChanges = (await this._getChanges(docSession, activeDoc, states, parent.h,
'HEAD')).details!.rightChanges;
// Calculate changes from the (common) parent to the current version of the other document.
const url = `/api/docs/${req.params.docId2}/compare?left=${parent.h}`;
const rightChangesReq = await fetch(this._grist.getHomeUrl(req, url), {
headers: {
...getTransitiveHeaders(req),
'Content-Type': 'application/json',
}
});
const rightChanges = (await rightChangesReq.json()).details!.rightChanges;
// Add the left and right changes as details to the result.
comparison.details = { leftChanges, rightChanges };
}
res.json(comparison);
}));
// Give details about what changed between two versions of a document.
this._app.get('/api/docs/:docId/compare', canView, withDoc(async (activeDoc, req, res) => {
// This could be a relatively slow operation if actions are large.
const left = stringParam(req.query.left || 'HEAD', 'left');
const right = stringParam(req.query.right || 'HEAD', 'right');
const docSession = docSessionFromRequest(req);
const {states} = await this._getStates(docSession, activeDoc);
res.json(await this._getChanges(docSession, activeDoc, states, left, right));
}));
// Do an import targeted at a specific workspace. Although the URL fits ApiServer, this
// endpoint is handled only by DocWorker, so is handled here. (Note: this does not handle
// actual file uploads, so no worries here about large request bodies.)
this._app.post('/api/workspaces/:wid/import', expressWrap(async (req, res) => {
const userId = getUserId(req);
const wsId = integerParam(req.params.wid, 'wid');
const uploadId = integerParam(req.body.uploadId, 'uploadId');
const result = await this._docManager.importDocToWorkspace(userId, uploadId, wsId, req.body.browserSettings);
res.json(result);
}));
this._app.get('/api/docs/:docId/download/csv', canView, withDoc(async (activeDoc, req, res) => {
// Query DB for doc metadata to get the doc title.
const {name: docTitle} =
await this._dbManager.getDoc({userId: getUserId(req), org: req.org, urlId: getDocId(req)});
const params = parseExportParameters(req);
const filename = docTitle + (params.tableId === docTitle ? '' : '-' + params.tableId);
const options: DownloadCSVOptions = {
...params,
filename,
};
await downloadCSV(activeDoc, req, res, options);
}));
this._app.get('/api/docs/:docId/download/xlsx', canView, withDoc(async (activeDoc, req, res) => {
// Query DB for doc metadata to get the doc title (to use as the filename).
const {name: filename} =
await this._dbManager.getDoc({userId: getUserId(req), org: req.org, urlId: getDocId(req)});
const options: DownloadXLSXOptions = {filename};
await downloadXLSX(activeDoc, req, res, options);
}));
this._app.get('/api/docs/:docId/send-to-drive', canView, decodeGoogleToken, withDoc(exportToDrive));
// Create a document. When an upload is included, it is imported as the initial
// state of the document. Otherwise a fresh empty document is created.
// A "timezone" option can be supplied.
// Documents are created "unsaved".
// TODO: support workspaceId option for creating regular documents, at which point
// existing import endpoint and doc creation endpoint can share implementation
// with this.
// Returns the id of the created document.
this._app.post('/api/docs', expressWrap(async (req, res) => {
const userId = getUserId(req);
let uploadId: number|undefined;
let parameters: {[key: string]: any};
if (req.is('multipart/form-data')) {
const formResult = await handleOptionalUpload(req, res);
if (formResult.upload) {
uploadId = formResult.upload.uploadId;
}
parameters = formResult.parameters || {};
} else {
parameters = req.body;
}
if (parameters.workspaceId) { throw new Error('workspaceId not supported'); }
const browserSettings: BrowserSettings = {};
if (parameters.timezone) { browserSettings.timezone = parameters.timezone; }
browserSettings.locale = localeFromRequest(req);
if (uploadId !== undefined) {
const result = await this._docManager.importDocToWorkspace(userId, uploadId, null,
browserSettings);
return res.json(result.id);
}
const isAnonymous = isAnonymousUser(req);
const {docId} = makeForkIds({userId, isAnonymous, trunkDocId: NEW_DOCUMENT_CODE,
trunkUrlId: NEW_DOCUMENT_CODE});
await this._docManager.createNamedDoc(makeExceptionalDocSession('nascent', {
req: req as RequestWithLogin,
browserSettings
}), docId);
return res.status(200).json(docId);
}));
}
/**
* Check for read access to the given document, and return its
* canonical docId. Throws error if read access not available.
* This method is used for documents that are not the main document
* associated with the request, but are rather an extra source to be
* read from, so the access information is not cached in the
* request.
*/
private async _confirmDocIdForRead(req: Request, urlId: string): Promise<string> {
const userId = getUserId(req);
const org = (req as RequestWithLogin).org;
const docAuth = await makeDocAuthResult(this._dbManager.getDoc({urlId, userId, org}));
if (docAuth.error) { throw docAuth.error; }
assertAccess('viewers', docAuth);
return docAuth.docId!;
}
private _getActiveDoc(req: RequestWithLogin): Promise<ActiveDoc> {
return this._docManager.fetchDoc(docSessionFromRequest(req), getDocId(req));
}
private _getActiveDocIfAvailable(req: RequestWithLogin): Promise<ActiveDoc>|undefined {
return this._docManager.getActiveDoc(getDocId(req));
}
/**
* Middleware to track the number of requests outstanding on each document, and to
* throw an exception when the maximum number of requests are already outstanding.
* Also throws an exception if too many requests (based on the user's product plan)
* have been made today for this document.
* Access to a document must already have been authorized.
*/
private _apiThrottle(callback: (req: RequestWithLogin,
resp: Response,
next: NextFunction) => void | Promise<void>): RequestHandler {
const usage = new Map<string, number>();
const dailyUsage = new LRUCache<string, number>({max: 1024});
return async (req, res, next) => {
const docId = getDocId(req);
try {
const count = usage.get(docId) || 0;
usage.set(docId, count + 1);
if (count + 1 > MAX_PARALLEL_REQUESTS_PER_DOC) {
throw new ApiError(`Too many backlogged requests for document ${docId} - ` +
`try again later?`, 429);
}
if (await this._checkDailyDocApiUsage(req, docId, dailyUsage)) {
throw new ApiError(`Exceeded daily limit for document ${docId}`, 429);
}
await callback(req as RequestWithLogin, res, next);
} catch (err) {
next(err);
} finally {
const count = usage.get(docId);
if (count) {
if (count === 1) {
usage.delete(docId);
} else {
usage.set(docId, count - 1);
}
}
}
};
}
/**
* Usually returns true if too many requests (based on the user's product plan)
* have been made today for this document.
* Access to a document must already have been authorized.
* This is called frequently so it uses caches to check quickly in the common case,
* which allows a few ways for users to exceed the limit slightly if the timing works out,
* but these should be acceptable.
*/
private async _checkDailyDocApiUsage(req: Request, docId: string, dailyUsage: LRUCache<string, number>) {
// Start with the possibly stale cached doc to avoid a database call.
// This leaves a small window for the user to bypass this limit after downgrading.
let doc = (req as RequestWithLogin).docAuth!.cachedDoc!;
function getMax() {
return doc.workspace.org.billingAccount?.product.features.baseMaxApiUnitsPerDocumentPerDay;
}
let max = getMax();
if (!max) {
// This doc has no associated product (happens to new unsaved docs)
// or the product has no API limit.
return;
}
// Get the current count from the dailyUsage cache rather than waiting for redis.
// The cache will not have a count if this is the first request for this document served by this worker process
// or if so many other documents have been served since then that this key was evicted from the LRU cache.
// Both scenarios are temporary and unlikely when usage has been exceeded.
const key = docDailyApiUsageKey(docId);
const count = dailyUsage.get(key);
if (count && count >= max) {
// The limit has apparently been exceeded.
// In case the user just upgraded, get a fresh Document entity from the DB and check again.
doc = await this._dbManager.getDoc(getDocScope(req));
max = getMax();
if (max && count >= max) {
return true;
}
}
// Note the increased API usage on redis and in our local cache.
// Do this in the background so that the rest of the request can continue without waiting for redis.
// If the user makes many concurrent requests quickly,
// a few extra might slip through before we see the count exceeding the limit, but this is basically unavoidable.
this._docWorkerMap.incrementDocApiUsage(key).then(newCount => {
if (newCount) {
// Theoretically this could be overwritten by a lower count that was requested earlier
// but somehow arrived after.
// This doesn't really matter, and the count on redis will still increase reliably.
dailyUsage.set(key, newCount);
}
}).catch(e => console.error(`Error tracking API usage for doc ${docId}`, e));
}
private async _assertAccess(role: 'viewers'|'editors'|'owners'|null, allowRemoved: boolean,
req: Request, res: Response, next: NextFunction) {
const scope = getDocScope(req);
allowRemoved = scope.showAll || scope.showRemoved || allowRemoved;
const docAuth = await getOrSetDocAuth(req as RequestWithLogin, this._dbManager, scope.urlId);
if (role) { assertAccess(role, docAuth, {allowRemoved}); }
next();
}
/**
* Check if user is an owner of the document.
*/
private async _isOwner(req: Request) {
const scope = getDocScope(req);
const docAuth = await getOrSetDocAuth(req as RequestWithLogin, this._dbManager, scope.urlId);
return docAuth.access === 'owners';
}
// Helper to generate a 503 if the ActiveDoc has been muted.
private _checkForMute(activeDoc: ActiveDoc|undefined) {
if (activeDoc && activeDoc.muted) {
throw new ApiError('Document in flux - try again later', 503);
}
}
/**
* Throws an error if, during processing, the ActiveDoc becomes "muted". Also replaces any
* other error that may have occurred if the ActiveDoc becomes "muted", since the document
* shutting down during processing may have caused a variety of errors.
*
* Expects to be called within a handler that catches exceptions.
*/
private _requireActiveDoc(callback: WithDocHandler): RequestHandler {
return async (req, res) => {
let activeDoc: ActiveDoc|undefined;
try {
activeDoc = await this._getActiveDoc(req as RequestWithLogin);
await callback(activeDoc, req as RequestWithLogin, res);
if (!res.headersSent) { this._checkForMute(activeDoc); }
} catch (err) {
this._checkForMute(activeDoc);
throw err;
}
};
}
private async _getStates(docSession: OptDocSession, activeDoc: ActiveDoc): Promise<DocStates> {
const states = await activeDoc.getRecentStates(docSession);
return {
states,
};
}
/**
*
* Calculate changes between two document versions identified by leftHash and rightHash.
* If rightHash is the latest version of the document, the ActionSummary for it will
* contain a copy of updated and added rows.
*
* Currently will fail if leftHash is not an ancestor of rightHash (this restriction could
* be lifted, but is adequate for now).
*
*/
private async _getChanges(docSession: OptDocSession, activeDoc: ActiveDoc, states: DocState[],
leftHash: string, rightHash: string): Promise<DocStateComparison> {
const finder = new HashUtil(states);
const leftOffset = finder.hashToOffset(leftHash);
const rightOffset = finder.hashToOffset(rightHash);
if (rightOffset > leftOffset) {
throw new Error('Comparisons currently require left to be an ancestor of right');
}
const actionNums: number[] = states.slice(rightOffset, leftOffset).map(state => state.n);
const actions = (await activeDoc.getActions(actionNums)).reverse();
let totalAction = createEmptyActionSummary();
for (const action of actions) {
if (!action) { continue; }
const summary = summarizeAction(action);
totalAction = concatenateSummaries([totalAction, summary]);
}
const result: DocStateComparison = {
left: states[leftOffset],
right: states[rightOffset],
parent: states[leftOffset],
summary: (leftOffset === rightOffset) ? 'same' : 'right',
details: {
leftChanges: {tableRenames: [], tableDeltas: {}},
rightChanges: totalAction
}
};
return result;
}
private async _removeDoc(req: Request, res: Response, permanent: boolean) {
const scope = getDocScope(req);
const docId = getDocId(req);
if (permanent) {
// Soft delete the doc first, to de-list the document.
await this._dbManager.softDeleteDocument(scope);
// Delete document content from storage.
await this._docManager.deleteDoc(null, docId, true);
// Permanently delete from database.
const query = await this._dbManager.deleteDocument(scope);
this._dbManager.checkQueryResult(query);
await sendReply(req, res, query);
} else {
await this._dbManager.softDeleteDocument(scope);
await sendOkReply(req, res);
}
await this._dbManager.flushSingleDocAuthCache(scope, docId);
await this._docManager.interruptDocClients(docId);
}
}
export function addDocApiRoutes(
app: Application, docWorker: DocWorker, docWorkerMap: IDocWorkerMap, docManager: DocManager, dbManager: HomeDBManager,
grist: GristServer
) {
const api = new DocWorkerApi(app, docWorker, docWorkerMap, docManager, dbManager, grist);
api.addEndpoints();
}
/**
* Options for returning results from a query about document data.
* Currently these option don't affect the query itself, only the
* results returned to the user.
*/
export interface QueryParameters {
sort?: string[]; // Columns names to sort by (ascending order by default,
// prepend "-" for descending order, can contain flags,
// see more in Sort.SortSpec).
limit?: number; // Limit on number of rows to return.
}
/**
* Extract a sort parameter from a request, if present. Follows
* https://jsonapi.org/format/#fetching-sorting for want of a better
* standard - comma separated, defaulting to ascending order, keys
* prefixed by "-" for descending order.
*
* The sort parameter can either be given as a query parameter, or
* as a header.
*/
function getSortParameter(req: Request): string[]|undefined {
const sortString: string|undefined = optStringParam(req.query.sort) || req.get('X-Sort');
if (!sortString) { return undefined; }
return sortString.split(',');
}
/**
* Extract a limit parameter from a request, if present. Should be a
* simple integer. The limit parameter can either be given as a query
* parameter, or as a header.
*/
function getLimitParameter(req: Request): number|undefined {
const limitString: string|undefined = optStringParam(req.query.limit) || req.get('X-Limit');
if (!limitString) { return undefined; }
const limit = parseInt(limitString, 10);
if (isNaN(limit)) { throw new Error('limit is not a number'); }
return limit;
}
/**
* Extract sort and limit parameters from request, if they are present.
*/
function getQueryParameters(req: Request): QueryParameters {
return {
sort: getSortParameter(req),
limit: getLimitParameter(req),
};
}
/**
* Sort table contents being returned. Sort keys with a '-' prefix
* are sorted in descending order, otherwise ascending. Contents are
* modified in place. Sort keys can contain sort options.
* Columns can be either expressed as a colId (name string) or as colRef (rowId number).
*/
function applySort(
values: TableColValues,
sort: string[],
_columns: TableRecordValue[]|null = null) {
if (!sort) { return values; }
// First we need to prepare column description in ColValue format (plain objects).
// This format is used by ServerColumnGetters.
let properColumns: ColValues[] = [];
// We will receive columns information only for user tables, not for metatables. So
// if this is the case, we will infer them from the result.
if (!_columns) {
_columns = Object.keys(values).map((col, index) => ({ id: col, fields: { colRef: index }}));
}
// For user tables, we will not get id column (as this column is not in the schema), so we need to
// make sure the column is there.
else {
// This is enough information for ServerGetters
_columns = [..._columns, { id : 'id', fields: {colRef: 0 }}];
}
// Once we have proper columns, we can convert them to format that ServerColumnGetters
// understand.
properColumns = _columns.map(c => ({
...c.fields,
id : c.fields.colRef,
colId: c.id
}));
// We will sort row indices in the values object, not rows ids.
const rowIndices = values.id.map((__, i) => i);
const getters = new ServerColumnGetters(rowIndices, values, properColumns);
const sortFunc = new SortFunc(getters);
const colIdToRef = new Map(properColumns.map(({id, colId}) => [colId as string, id as number]));
sortFunc.updateSpec(Sort.parseNames(sort, colIdToRef));
rowIndices.sort(sortFunc.compare.bind(sortFunc));
// Sort resulting values according to the sorted index.
for (const key of Object.keys(values)) {
const col = values[key];
values[key] = rowIndices.map(i => col[i]);
}
return values;
}
/**
* Truncate columns to the first N values. Columns are modified in place.
*/
function applyLimit(values: TableColValues, limit: number) {
// for no limit, or 0 limit, do not apply any restriction
if (!limit) { return values; }
for (const key of Object.keys(values)) {
values[key].splice(limit);
}
return values;
}
/**
* Apply query parameters to table contents. Contents are modified in place.
*/
export function applyQueryParameters(
values: TableColValues,
params: QueryParameters,
columns: TableRecordValue[]|null = null): TableColValues {
if (params.sort) { applySort(values, params.sort, columns); }
if (params.limit) { applyLimit(values, params.limit); }
return values;
}
function getErrorPlatform(tableId: string): TableOperationsPlatform {
return {
async getTableId() { return tableId; },
throwError(verb, text, status) {
throw new ApiError(verb + (verb ? ' ' : '') + text, status);
},
applyUserActions() {
throw new Error('no document');
}
};
}
function getTableOperations(req: RequestWithLogin, activeDoc: ActiveDoc): TableOperationsImpl {
const options: OpOptions = {
parseStrings: !isAffirmative(req.query.noparse)
};
const platform: TableOperationsPlatform = {
...getErrorPlatform(req.params.tableId),
applyUserActions(actions, opts) {
if (!activeDoc) { throw new Error('no document'); }
return activeDoc.applyUserActions(
docSessionFromRequest(req),
actions,
opts
);
}
};
return new TableOperationsImpl(platform, options);
}
async function handleSandboxError<T>(tableId: string, colNames: string[], p: Promise<T>): Promise<T> {
return handleSandboxErrorOnPlatform(tableId, colNames, p, getErrorPlatform(tableId));
}
/**
* Returns a key used for redis and a local cache
* which store the number of API requests made for the given document today.
* Defined here so that it can easily be accessed in tests.
* The key contains the current UTC date so that counts from previous days are simply ignored and eventually evicted.
* This means that the daily measured usage conceptually 'resets' at UTC midnight.
*/
export function docDailyApiUsageKey(docId: string) {
const d = new Date();
return `doc-${docId}-dailyApiUsage-${d.getUTCFullYear()}-${d.getUTCMonth() + 1}-${d.getUTCDate()}`;
}