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Diffstat (limited to 'browser/components/attribution/AttributionCode.sys.mjs')
| -rw-r--r-- | browser/components/attribution/AttributionCode.sys.mjs | 388 |
1 files changed, 388 insertions, 0 deletions
diff --git a/browser/components/attribution/AttributionCode.sys.mjs b/browser/components/attribution/AttributionCode.sys.mjs new file mode 100644 index 0000000000..516ca2c680 --- /dev/null +++ b/browser/components/attribution/AttributionCode.sys.mjs @@ -0,0 +1,388 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/** + * This is a policy object used to override behavior for testing. + */ +export const AttributionIOUtils = { + write: async (path, bytes) => IOUtils.write(path, bytes), + read: async path => IOUtils.read(path), + exists: async path => IOUtils.exists(path), +}; + +import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs"; + +const lazy = {}; +ChromeUtils.defineESModuleGetters(lazy, { + MacAttribution: "resource:///modules/MacAttribution.sys.mjs", +}); +ChromeUtils.defineLazyGetter(lazy, "log", () => { + let { ConsoleAPI } = ChromeUtils.importESModule( + "resource://gre/modules/Console.sys.mjs" + ); + let consoleOptions = { + // tip: set maxLogLevel to "debug" and use lazy.log.debug() to create + // detailed messages during development. See LOG_LEVELS in Console.sys.mjs + // for details. + maxLogLevel: "error", + maxLogLevelPref: "browser.attribution.loglevel", + prefix: "AttributionCode", + }; + return new ConsoleAPI(consoleOptions); +}); + +// This maximum length was originally based on how much space we have in the PE +// file header that we store attribution codes in for full and stub installers. +// Windows Store builds instead use a "Campaign ID" passed through URLs to send +// attribution information, which Microsoft's documentation claims must be no +// longer than 100 characters. In our own testing, we've been able to retrieve +// the first 208 characters of the Campaign ID. Either way, the "max" length +// for Microsoft Store builds is much lower than this limit implies. +const ATTR_CODE_MAX_LENGTH = 1010; +const ATTR_CODE_VALUE_REGEX = /[a-zA-Z0-9_%\\-\\.\\(\\)]*/; +const ATTR_CODE_FIELD_SEPARATOR = "%26"; // URL-encoded & +const ATTR_CODE_KEY_VALUE_SEPARATOR = "%3D"; // URL-encoded = +const ATTR_CODE_KEYS = [ + "source", + "medium", + "campaign", + "content", + "experiment", + "variation", + "ua", + "dltoken", + "msstoresignedin", + "dlsource", +]; + +let gCachedAttrData = null; + +export var AttributionCode = { + /** + * Wrapper to pull campaign IDs from MSIX builds. + * This function solely exists to make it easy to mock out for tests. + */ + async msixCampaignId() { + const windowsPackageManager = Cc[ + "@mozilla.org/windows-package-manager;1" + ].createInstance(Ci.nsIWindowsPackageManager); + + return windowsPackageManager.campaignId(); + }, + + /** + * Returns a platform-specific nsIFile for the file containing the attribution + * data, or null if the current platform does not support (caching) + * attribution data. + */ + get attributionFile() { + if (AppConstants.platform == "win") { + let file = Services.dirsvc.get("GreD", Ci.nsIFile); + file.append("postSigningData"); + return file; + } + + return null; + }, + + /** + * Write the given attribution code to the attribution file. + * @param {String} code to write. + */ + async writeAttributionFile(code) { + // Writing attribution files is only used as part of test code + // so bailing here for MSIX builds is no big deal. + if ( + AppConstants.platform === "win" && + Services.sysinfo.getProperty("hasWinPackageId") + ) { + Services.console.logStringMessage( + "Attribution code cannot be written for MSIX builds, aborting." + ); + return; + } + let file = AttributionCode.attributionFile; + await IOUtils.makeDirectory(file.parent.path); + let bytes = new TextEncoder().encode(code); + await AttributionIOUtils.write(file.path, bytes); + }, + + /** + * Returns an array of allowed attribution code keys. + */ + get allowedCodeKeys() { + return [...ATTR_CODE_KEYS]; + }, + + /** + * Returns an object containing a key-value pair for each piece of attribution + * data included in the passed-in attribution code string. + * If the string isn't a valid attribution code, returns an empty object. + */ + parseAttributionCode(code) { + if (code.length > ATTR_CODE_MAX_LENGTH) { + return {}; + } + + let isValid = true; + let parsed = {}; + for (let param of code.split(ATTR_CODE_FIELD_SEPARATOR)) { + let [key, value] = param.split(ATTR_CODE_KEY_VALUE_SEPARATOR, 2); + if (key && ATTR_CODE_KEYS.includes(key)) { + if (value && ATTR_CODE_VALUE_REGEX.test(value)) { + if (key === "msstoresignedin") { + if (value === "true") { + parsed[key] = true; + } else if (value === "false") { + parsed[key] = false; + } else { + throw new Error("Couldn't parse msstoresignedin"); + } + } else { + parsed[key] = value; + } + } + } else { + lazy.log.debug( + `parseAttributionCode: "${code}" => isValid = false: "${key}", "${value}"` + ); + isValid = false; + break; + } + } + + if (isValid) { + return parsed; + } + + Services.telemetry + .getHistogramById("BROWSER_ATTRIBUTION_ERRORS") + .add("decode_error"); + + return {}; + }, + + /** + * Returns a string serializing the given attribution data. + * + * It is expected that the given values are already URL-encoded. + */ + serializeAttributionData(data) { + // Iterating in this way makes the order deterministic. + let s = ""; + for (let key of ATTR_CODE_KEYS) { + if (key in data) { + let value = data[key]; + if (s) { + s += ATTR_CODE_FIELD_SEPARATOR; // URL-encoded & + } + s += `${key}${ATTR_CODE_KEY_VALUE_SEPARATOR}${value}`; // URL-encoded = + } + } + return s; + }, + + async _getMacAttrDataAsync() { + // On macOS, we fish the attribution data from an extended attribute on + // the .app bundle directory. + try { + let attrStr = await lazy.MacAttribution.getAttributionString(); + lazy.log.debug( + `_getMacAttrDataAsync: getAttributionString: "${attrStr}"` + ); + + if (attrStr === null) { + gCachedAttrData = {}; + + lazy.log.debug(`_getMacAttrDataAsync: null attribution string`); + Services.telemetry + .getHistogramById("BROWSER_ATTRIBUTION_ERRORS") + .add("null_error"); + } else if (attrStr == "") { + gCachedAttrData = {}; + + lazy.log.debug(`_getMacAttrDataAsync: empty attribution string`); + Services.telemetry + .getHistogramById("BROWSER_ATTRIBUTION_ERRORS") + .add("empty_error"); + } else { + gCachedAttrData = this.parseAttributionCode(attrStr); + } + } catch (ex) { + // Avoid partial attribution data. + gCachedAttrData = {}; + + // No attributions. Just `warn` 'cuz this isn't necessarily an error. + lazy.log.warn("Caught exception fetching macOS attribution codes!", ex); + + if ( + ex instanceof Ci.nsIException && + ex.result == Cr.NS_ERROR_UNEXPECTED + ) { + // Bad quarantine data. + Services.telemetry + .getHistogramById("BROWSER_ATTRIBUTION_ERRORS") + .add("quarantine_error"); + } + } + + lazy.log.debug( + `macOS attribution data is ${JSON.stringify(gCachedAttrData)}` + ); + + return gCachedAttrData; + }, + + async _getWindowsNSISAttrDataAsync() { + return AttributionIOUtils.read(this.attributionFile.path); + }, + + async _getWindowsMSIXAttrDataAsync() { + // This comes out of windows-package-manager _not_ URL encoded or in an ArrayBuffer, + // but the parsing code wants it that way. It's easier to just provide that + // than have the parsing code support both. + lazy.log.debug( + `winPackageFamilyName is: ${Services.sysinfo.getProperty( + "winPackageFamilyName" + )}` + ); + let encoder = new TextEncoder(); + return encoder.encode(encodeURIComponent(await this.msixCampaignId())); + }, + + /** + * Reads the attribution code, either from disk or a cached version. + * Returns a promise that fulfills with an object containing the parsed + * attribution data if the code could be read and is valid, + * or an empty object otherwise. + * + * On windows the attribution service converts utm_* keys, removing "utm_". + * On OSX the attributions are set directly on download and retain "utm_". We + * strip "utm_" while retrieving the params. + */ + async getAttrDataAsync() { + if (AppConstants.platform != "win" && AppConstants.platform != "macosx") { + // This platform doesn't support attribution. + return gCachedAttrData; + } + if (gCachedAttrData != null) { + lazy.log.debug( + `getAttrDataAsync: attribution is cached: ${JSON.stringify( + gCachedAttrData + )}` + ); + return gCachedAttrData; + } + + gCachedAttrData = {}; + + if (AppConstants.platform == "macosx") { + lazy.log.debug(`getAttrDataAsync: macOS`); + return this._getMacAttrDataAsync(); + } + + lazy.log.debug("getAttrDataAsync: !macOS"); + + let attributionFile = this.attributionFile; + let bytes; + try { + if ( + AppConstants.platform === "win" && + Services.sysinfo.getProperty("hasWinPackageId") + ) { + lazy.log.debug("getAttrDataAsync: MSIX"); + bytes = await this._getWindowsMSIXAttrDataAsync(); + } else { + lazy.log.debug("getAttrDataAsync: NSIS"); + bytes = await this._getWindowsNSISAttrDataAsync(); + } + } catch (ex) { + if (DOMException.isInstance(ex) && ex.name == "NotFoundError") { + lazy.log.debug( + `getAttrDataAsync: !exists("${ + attributionFile.path + }"), returning ${JSON.stringify(gCachedAttrData)}` + ); + return gCachedAttrData; + } + lazy.log.debug( + `other error trying to read attribution data: + attributionFile.path is: ${attributionFile.path}` + ); + lazy.log.debug("Full exception is:"); + lazy.log.debug(ex); + + Services.telemetry + .getHistogramById("BROWSER_ATTRIBUTION_ERRORS") + .add("read_error"); + } + if (bytes) { + try { + let decoder = new TextDecoder(); + let code = decoder.decode(bytes); + lazy.log.debug( + `getAttrDataAsync: attribution bytes deserializes to ${code}` + ); + if (AppConstants.platform == "macosx" && !code) { + // On macOS, an empty attribution code is fine. (On Windows, that + // means the stub/full installer has been incorrectly attributed, + // which is an error.) + return gCachedAttrData; + } + + gCachedAttrData = this.parseAttributionCode(code); + lazy.log.debug( + `getAttrDataAsync: ${code} parses to ${JSON.stringify( + gCachedAttrData + )}` + ); + } catch (ex) { + // TextDecoder can throw an error + Services.telemetry + .getHistogramById("BROWSER_ATTRIBUTION_ERRORS") + .add("decode_error"); + } + } + + return gCachedAttrData; + }, + + /** + * Return the cached attribution data synchronously without hitting + * the disk. + * @returns A dictionary with the attribution data if it's available, + * null otherwise. + */ + getCachedAttributionData() { + return gCachedAttrData; + }, + + /** + * Deletes the attribution data file. + * Returns a promise that resolves when the file is deleted, + * or if the file couldn't be deleted (the promise is never rejected). + */ + async deleteFileAsync() { + // There is no cache file on macOS + if (AppConstants.platform == "win") { + try { + await IOUtils.remove(this.attributionFile.path); + } catch (ex) { + // The attribution file may already have been deleted, + // or it may have never been installed at all; + // failure to delete it isn't an error. + } + } + }, + + /** + * Clears the cached attribution code value, if any. + * Does nothing if called from outside of an xpcshell test. + */ + _clearCache() { + if (Services.env.exists("XPCSHELL_TEST_PROFILE_DIR")) { + gCachedAttrData = null; + } + }, +}; |