Merge from vscode aba87f135229c17c4624341b7a2499dcedafcb87 (#6430)

* Merge from vscode aba87f135229c17c4624341b7a2499dcedafcb87

* fix compile errors

src/vs/platform/telemetry/common/telemetryUtils.ts

@@ -9,6 +9,8 @@ import { IKeybindingService, KeybindingSource } from 'vs/platform/keybinding/com
 import { ITelemetryService, ITelemetryInfo, ITelemetryData } from 'vs/platform/telemetry/common/telemetry';
 import { ILogService } from 'vs/platform/log/common/log';
 import { ClassifiedEvent, StrictPropertyCheck, GDPRClassification } from 'vs/platform/telemetry/common/gdprTypings';
+import { safeStringify } from 'vs/base/common/objects';
+import { isObject } from 'vs/base/common/types';
 
 export const NullTelemetryService = new class implements ITelemetryService {
 	_serviceBrand: undefined;
@@ -243,6 +245,77 @@ export function keybindingsTelemetry(telemetryService: ITelemetryService, keybin
 	});
 }
 
+
+export interface Properties {
+	[key: string]: string;
+}
+
+export interface Measurements {
+	[key: string]: number;
+}
+
+export function validateTelemetryData(data?: any): { properties: Properties, measurements: Measurements } {
+
+	const properties: Properties = Object.create(null);
+	const measurements: Measurements = Object.create(null);
+
+	const flat = Object.create(null);
+	flatten(data, flat);
+
+	for (let prop in flat) {
+		// enforce property names less than 150 char, take the last 150 char
+		prop = prop.length > 150 ? prop.substr(prop.length - 149) : prop;
+		const value = flat[prop];
+
+		if (typeof value === 'number') {
+			measurements[prop] = value;
+
+		} else if (typeof value === 'boolean') {
+			measurements[prop] = value ? 1 : 0;
+
+		} else if (typeof value === 'string') {
+			//enforce property value to be less than 1024 char, take the first 1024 char
+			properties[prop] = value.substring(0, 1023);
+
+		} else if (typeof value !== 'undefined' && value !== null) {
+			properties[prop] = value;
+		}
+	}
+
+	return {
+		properties,
+		measurements
+	};
+}
+
+function flatten(obj: any, result: { [key: string]: any }, order: number = 0, prefix?: string): void {
+	if (!obj) {
+		return;
+	}
+
+	for (let item of Object.getOwnPropertyNames(obj)) {
+		const value = obj[item];
+		const index = prefix ? prefix + item : item;
+
+		if (Array.isArray(value)) {
+			result[index] = safeStringify(value);
+
+		} else if (value instanceof Date) {
+			// TODO unsure why this is here and not in _getData
+			result[index] = value.toISOString();
+
+		} else if (isObject(value)) {
+			if (order < 2) {
+				flatten(value, result, order + 1, index + '.');
+			} else {
+				result[index] = safeStringify(value);
+			}
+		} else {
+			result[index] = value;
+		}
+	}
+}
+
 function flattenKeys(value: Object | undefined): string[] {
 	if (!value) {
 		return [];