feat(integrations): Add scrubbing sensitive data integration

packages/integrations/src/index.ts

@@ -6,6 +6,7 @@ export { Ember } from './ember';
 export { ExtraErrorData } from './extraerrordata';
 export { ReportingObserver } from './reportingobserver';
 export { RewriteFrames } from './rewriteframes';
+export { ScrubData } from './scrubdata';
 export { SessionTiming } from './sessiontiming';
 export { Transaction } from './transaction';
 export { Vue } from './vue';

packages/integrations/src/scrubdata.ts

@@ -0,0 +1,116 @@
+import { Event, EventHint, EventProcessor, Hub, Integration } from '@sentry/types';
+import { isPlainObject, isRegExp, Memo } from '@sentry/utils';
+
+/** JSDoc */
+interface ScrubDataOptions {
+  sanitizeKeys: Array<string | RegExp>;
+}
+
+/** JSDoc */
+export class ScrubData implements Integration {
+  /**
+   * @inheritDoc
+   */
+  public name: string = ScrubData.id;
+
+  /**
+   * @inheritDoc
+   */
+  public static id: string = 'ScrubData';
+
+  /** JSDoc */
+  private readonly _options: ScrubDataOptions;
+  private readonly _sanitizeMask: string;
+  private _lazySanitizeRegExp?: RegExp;
+
+  /**
+   * @inheritDoc
+   */
+  public constructor(options: ScrubDataOptions) {
+    this._options = {
+      sanitizeKeys: [],
+      ...options,
+    };
+    this._sanitizeMask = '********';
+  }
+
+  /**
+   * @inheritDoc
+   */
+  public setupOnce(addGlobalEventProcessor: (callback: EventProcessor) => void, getCurrentHub: () => Hub): void {
+    addGlobalEventProcessor((event: Event, _hint?: EventHint) => {
+      const self = getCurrentHub().getIntegration(ScrubData);
+      if (self) {
+        return self.process(event);
+      }
+      return event;
+    });
+  }
+
+  /** JSDoc */
+  public process(event: Event): Event {
+    if (this._options.sanitizeKeys.length === 0) {
+      // nothing to sanitize
+      return event;
+    }
+
+    return this._sanitize(event) as Event;
+  }
+
+  /**
+   * lazily generate regexp
+   */
+  private _sanitizeRegExp(): RegExp {
+    if (this._lazySanitizeRegExp) {
+      return this._lazySanitizeRegExp;
+    }
+
+    const sources = this._options.sanitizeKeys.reduce(
+      (acc, key) => {
+        if (typeof key === 'string') {
+          // escape string value
+          // see also: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#Escaping
+          acc.push(key.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'));
+        } else if (isRegExp(key)) {
+          acc.push(key.source);
+        }
+        return acc;
+      },
+      [] as string[],
+    );
+
+    return (this._lazySanitizeRegExp = RegExp(sources.join('|'), 'i'));
+  }
+
+  /**
+   * sanitize event data recursively
+   */
+  private _sanitize(input: unknown, memo: Memo = new Memo()): unknown {
+    const inputIsArray = Array.isArray(input);
+    const inputIsPlainObject = isPlainObject(input);
+
+    if (!inputIsArray && !inputIsPlainObject) {
+      return input;
+    }
+
+    // Avoid circular references
+    if (memo.memoize(input)) {
+      return input;
+    }
+
+    let sanitizedValue;
+    if (inputIsArray) {
+      sanitizedValue = (input as any[]).map(value => this._sanitize(value, memo));
+    } else if (inputIsPlainObject) {
+      const inputVal = input as { [key: string]: unknown };
+      sanitizedValue = Object.keys(inputVal).reduce<Record<string, unknown>>((acc, key) => {
+        acc[key] = this._sanitizeRegExp().test(key) ? this._sanitizeMask : this._sanitize(inputVal[key], memo);
+        return acc;
+      }, {});
+    }
+
+    memo.unmemoize(input);
+
+    return sanitizedValue;
+  }
+}

packages/integrations/test/scrubdata.test.ts

@@ -0,0 +1,151 @@
+import { ScrubData } from '../src/scrubdata';
+
+/** JSDoc */
+function clone<T>(data: T): T {
+  return JSON.parse(JSON.stringify(data));
+}
+
+let scrubData: ScrubData;
+const sanitizeMask = '********';
+const messageEvent = {
+  fingerprint: ['MrSnuffles'],
+  message: 'PickleRick',
+  stacktrace: {
+    frames: [
+      {
+        colno: 1,
+        filename: 'filename.js',
+        function: 'function',
+        lineno: 1,
+      },
+      {
+        colno: 2,
+        filename: 'filename.js',
+        function: 'function',
+        lineno: 2,
+      },
+    ],
+  },
+};
+
+describe('ScrubData', () => {
+  describe('sanitizeKeys option is empty', () => {
+    beforeEach(() => {
+      scrubData = new ScrubData({
+        sanitizeKeys: [],
+      });
+    });
+
+    it('should not affect any changes', () => {
+      const event = clone(messageEvent);
+      const processedEvent = scrubData.process(event);
+      expect(processedEvent).toEqual(event);
+    });
+  });
+
+  describe('sanitizeKeys option has type of string', () => {
+    beforeEach(() => {
+      scrubData = new ScrubData({
+        sanitizeKeys: ['message', 'filename'],
+      });
+    });
+
+    it('should mask matched value in object', () => {
+      const event = scrubData.process(clone(messageEvent));
+      expect(event.message).toEqual(sanitizeMask);
+    });
+
+    it('should not mask unmatched value in object', () => {
+      const event = scrubData.process(clone(messageEvent));
+      expect(event.fingerprint).toEqual(messageEvent.fingerprint);
+    });
+
+    it('should mask matched value in Array', () => {
+      const event: any = scrubData.process(clone(messageEvent));
+      expect(event.stacktrace.frames[0].filename).toEqual(sanitizeMask);
+      expect(event.stacktrace.frames[1].filename).toEqual(sanitizeMask);
+    });
+
+    it('should not mask unmatched value in Array', () => {
+      const event: any = scrubData.process(clone(messageEvent));
+      expect(event.stacktrace.frames[0].function).toEqual(messageEvent.stacktrace.frames[0].function);
+      expect(event.stacktrace.frames[1].function).toEqual(messageEvent.stacktrace.frames[1].function);
+    });
+  });
+
+  describe('sanitizeKeys option has type of RegExp', () => {
+    beforeEach(() => {
+      scrubData = new ScrubData({
+        sanitizeKeys: [/^name$/],
+      });
+    });
+
+    it('should mask only matched value', () => {
+      const testEvent: any = {
+        filename: 'to be show',
+        name: 'do not show',
+      };
+      const event: any = scrubData.process(testEvent);
+      expect(event.filename).toEqual(testEvent.filename);
+      expect(event.name).toEqual(sanitizeMask);
+    });
+  });
+
+  describe('sanitizeKeys option has mixed type of RegExp and string', () => {
+    beforeEach(() => {
+      scrubData = new ScrubData({
+        sanitizeKeys: [/^filename$/, 'function'],
+      });
+    });
+
+    it('should mask only matched value', () => {
+      const event: any = scrubData.process(clone(messageEvent));
+      expect(event.stacktrace.frames[0].function).toEqual(sanitizeMask);
+      expect(event.stacktrace.frames[1].function).toEqual(sanitizeMask);
+      expect(event.stacktrace.frames[0].filename).toEqual(sanitizeMask);
+      expect(event.stacktrace.frames[1].filename).toEqual(sanitizeMask);
+    });
+
+    it('should not mask unmatched value', () => {
+      const event: any = scrubData.process(clone(messageEvent));
+      expect(event.stacktrace.frames[0].colno).toEqual(messageEvent.stacktrace.frames[0].colno);
+      expect(event.stacktrace.frames[1].colno).toEqual(messageEvent.stacktrace.frames[1].colno);
+      expect(event.stacktrace.frames[0].lineno).toEqual(messageEvent.stacktrace.frames[0].lineno);
+      expect(event.stacktrace.frames[1].lineno).toEqual(messageEvent.stacktrace.frames[1].lineno);
+    });
+  });
+
+  describe('event has circular objects', () => {
+    beforeEach(() => {
+      scrubData = new ScrubData({
+        sanitizeKeys: [/message/],
+      });
+    });
+
+    it('should not show call stack size exceeded when circular reference in object', () => {
+      const event: any = {
+        contexts: {},
+        extra: {
+          message: 'do not show',
+        },
+      };
+      event.contexts.circular = event.contexts;
+
+      const actual: any = scrubData.process(event);
+      expect(actual.extra.message).toEqual(sanitizeMask);
+    });
+
+    it('should not show call stack size exceeded when circular reference in Array', () => {
+      const event: any = {
+        contexts: [],
+        extra: {
+          message: 'do not show',
+        },
+      };
+      event.contexts[0] = event.contexts;
+
+      const actual: any = scrubData.process(event);
+      expect(actual.extra.message).toEqual(sanitizeMask);
+    });
+  });
+});