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Diffstat (limited to '')
| -rw-r--r-- | docshell/base/URIFixup.sys.mjs | 1303 |
1 files changed, 1303 insertions, 0 deletions
diff --git a/docshell/base/URIFixup.sys.mjs b/docshell/base/URIFixup.sys.mjs new file mode 100644 index 0000000000..212bb0ddbf --- /dev/null +++ b/docshell/base/URIFixup.sys.mjs @@ -0,0 +1,1303 @@ +/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- + * vim: sw=2 ts=2 sts=2 expandtab + * 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 component handles fixing up URIs, by correcting obvious typos and adding + * missing schemes. + * URI references: + * http://www.faqs.org/rfcs/rfc1738.html + * http://www.faqs.org/rfcs/rfc2396.html + */ + +// TODO (Bug 1641220) getFixupURIInfo has a complex logic, that likely could be +// simplified, but the risk of regressing its behavior is high. +/* eslint complexity: ["error", 43] */ + +import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs"; + +import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs"; + +const lazy = {}; + +XPCOMUtils.defineLazyServiceGetter( + lazy, + "externalProtocolService", + "@mozilla.org/uriloader/external-protocol-service;1", + "nsIExternalProtocolService" +); + +XPCOMUtils.defineLazyServiceGetter( + lazy, + "defaultProtocolHandler", + "@mozilla.org/network/protocol;1?name=default", + "nsIProtocolHandler" +); + +XPCOMUtils.defineLazyServiceGetter( + lazy, + "fileProtocolHandler", + "@mozilla.org/network/protocol;1?name=file", + "nsIFileProtocolHandler" +); + +XPCOMUtils.defineLazyServiceGetter( + lazy, + "handlerService", + "@mozilla.org/uriloader/handler-service;1", + "nsIHandlerService" +); + +XPCOMUtils.defineLazyPreferenceGetter( + lazy, + "fixupSchemeTypos", + "browser.fixup.typo.scheme", + true +); +XPCOMUtils.defineLazyPreferenceGetter( + lazy, + "dnsFirstForSingleWords", + "browser.fixup.dns_first_for_single_words", + false +); +XPCOMUtils.defineLazyPreferenceGetter( + lazy, + "keywordEnabled", + "keyword.enabled", + true +); +XPCOMUtils.defineLazyPreferenceGetter( + lazy, + "alternateEnabled", + "browser.fixup.alternate.enabled", + false +); +XPCOMUtils.defineLazyPreferenceGetter( + lazy, + "alternateProtocol", + "browser.fixup.alternate.protocol", + "https" +); + +XPCOMUtils.defineLazyPreferenceGetter( + lazy, + "dnsResolveFullyQualifiedNames", + "browser.urlbar.dnsResolveFullyQualifiedNames", + true +); + +const { + FIXUP_FLAG_NONE, + FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP, + FIXUP_FLAGS_MAKE_ALTERNATE_URI, + FIXUP_FLAG_PRIVATE_CONTEXT, + FIXUP_FLAG_FIX_SCHEME_TYPOS, + FIXUP_FLAG_FORCE_ALTERNATE_URI, +} = Ci.nsIURIFixup; + +const COMMON_PROTOCOLS = ["http", "https", "file"]; + +// Regex used to identify user:password tokens in url strings. +// This is not a strict valid characters check, because we try to fixup this +// part of the url too. +XPCOMUtils.defineLazyGetter( + lazy, + "userPasswordRegex", + () => /^([a-z+.-]+:\/{0,3})*([^\/@]+@).+/i +); + +// Regex used to identify the string that starts with port expression. +XPCOMUtils.defineLazyGetter(lazy, "portRegex", () => /^:\d{1,5}([?#/]|$)/); + +// Regex used to identify numbers. +XPCOMUtils.defineLazyGetter(lazy, "numberRegex", () => /^[0-9]+(\.[0-9]+)?$/); + +// Regex used to identify tab separated content (having at least 2 tabs). +XPCOMUtils.defineLazyGetter(lazy, "maxOneTabRegex", () => /^[^\t]*\t?[^\t]*$/); + +// Regex used to test if a string with a protocol might instead be a url +// without a protocol but with a port: +// +// <hostname>:<port> or +// <hostname>:<port>/ +// +// Where <hostname> is a string of alphanumeric characters and dashes +// separated by dots. +// and <port> is a 5 or less digits. This actually breaks the rfc2396 +// definition of a scheme which allows dots in schemes. +// +// Note: +// People expecting this to work with +// <user>:<password>@<host>:<port>/<url-path> will be disappointed! +// +// Note: Parser could be a lot tighter, tossing out silly hostnames +// such as those containing consecutive dots and so on. +XPCOMUtils.defineLazyGetter( + lazy, + "possiblyHostPortRegex", + () => /^[a-z0-9-]+(\.[a-z0-9-]+)*:[0-9]{1,5}([/?#]|$)/i +); + +// Regex used to strip newlines. +XPCOMUtils.defineLazyGetter(lazy, "newLinesRegex", () => /[\r\n]/g); + +// Regex used to match a possible protocol. +// This resembles the logic in Services.io.extractScheme, thus \t is admitted +// and stripped later. We don't use Services.io.extractScheme because of +// performance bottleneck caused by crossing XPConnect. +XPCOMUtils.defineLazyGetter( + lazy, + "possibleProtocolRegex", + () => /^([a-z][a-z0-9.+\t-]*)(:|;)?(\/\/)?/i +); + +// Regex used to match IPs. Note that these are not made to validate IPs, but +// just to detect strings that look like an IP. They also skip protocol. +// For IPv4 this also accepts a shorthand format with just 2 dots. +XPCOMUtils.defineLazyGetter( + lazy, + "IPv4LikeRegex", + () => /^(?:[a-z+.-]+:\/*(?!\/))?(?:\d{1,3}\.){2,3}\d{1,3}(?::\d+|\/)?/i +); +XPCOMUtils.defineLazyGetter( + lazy, + "IPv6LikeRegex", + () => + /^(?:[a-z+.-]+:\/*(?!\/))?\[(?:[0-9a-f]{0,4}:){0,7}[0-9a-f]{0,4}\]?(?::\d+|\/)?/i +); + +// Cache of known domains. +XPCOMUtils.defineLazyGetter(lazy, "knownDomains", () => { + const branch = "browser.fixup.domainwhitelist."; + let domains = new Set( + Services.prefs + .getChildList(branch) + .filter(p => Services.prefs.getBoolPref(p, false)) + .map(p => p.substring(branch.length)) + ); + // Hold onto the observer to avoid it being GC-ed. + domains._observer = { + observe(subject, topic, data) { + let domain = data.substring(branch.length); + if (Services.prefs.getBoolPref(data, false)) { + domains.add(domain); + } else { + domains.delete(domain); + } + }, + QueryInterface: ChromeUtils.generateQI([ + "nsIObserver", + "nsISupportsWeakReference", + ]), + }; + Services.prefs.addObserver(branch, domains._observer, true); + return domains; +}); + +// Cache of known suffixes. +// This works differently from the known domains, because when we examine a +// domain we can't tell how many dot-separated parts constitute the suffix. +// We create a Map keyed by the last dotted part, containing a Set of +// all the suffixes ending with that part: +// "two" => ["two"] +// "three" => ["some.three", "three"] +// When searching we can restrict the linear scan based on the last part. +// The ideal structure for this would be a Directed Acyclic Word Graph, but +// since we expect this list to be small it's not worth the complication. +XPCOMUtils.defineLazyGetter(lazy, "knownSuffixes", () => { + const branch = "browser.fixup.domainsuffixwhitelist."; + let suffixes = new Map(); + let prefs = Services.prefs + .getChildList(branch) + .filter(p => Services.prefs.getBoolPref(p, false)); + for (let pref of prefs) { + let suffix = pref.substring(branch.length); + let lastPart = suffix.substr(suffix.lastIndexOf(".") + 1); + if (lastPart) { + let entries = suffixes.get(lastPart); + if (!entries) { + entries = new Set(); + suffixes.set(lastPart, entries); + } + entries.add(suffix); + } + } + // Hold onto the observer to avoid it being GC-ed. + suffixes._observer = { + observe(subject, topic, data) { + let suffix = data.substring(branch.length); + let lastPart = suffix.substr(suffix.lastIndexOf(".") + 1); + let entries = suffixes.get(lastPart); + if (Services.prefs.getBoolPref(data, false)) { + // Add the suffix. + if (!entries) { + entries = new Set(); + suffixes.set(lastPart, entries); + } + entries.add(suffix); + } else if (entries) { + // Remove the suffix. + entries.delete(suffix); + if (!entries.size) { + suffixes.delete(lastPart); + } + } + }, + QueryInterface: ChromeUtils.generateQI([ + "nsIObserver", + "nsISupportsWeakReference", + ]), + }; + Services.prefs.addObserver(branch, suffixes._observer, true); + return suffixes; +}); + +export function URIFixup() { + // There are cases that nsIExternalProtocolService.externalProtocolHandlerExists() does + // not work well and returns always true due to flatpak. In this case, in order to + // fallback to nsIHandlerService.exits(), we test whether can trust + // nsIExternalProtocolService here. + this._trustExternalProtocolService = + !lazy.externalProtocolService.externalProtocolHandlerExists( + `__dummy${Date.now()}__` + ); +} + +URIFixup.prototype = { + get FIXUP_FLAG_NONE() { + return FIXUP_FLAG_NONE; + }, + get FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP() { + return FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP; + }, + get FIXUP_FLAGS_MAKE_ALTERNATE_URI() { + return FIXUP_FLAGS_MAKE_ALTERNATE_URI; + }, + get FIXUP_FLAG_FORCE_ALTERNATE_URI() { + return FIXUP_FLAG_FORCE_ALTERNATE_URI; + }, + get FIXUP_FLAG_PRIVATE_CONTEXT() { + return FIXUP_FLAG_PRIVATE_CONTEXT; + }, + get FIXUP_FLAG_FIX_SCHEME_TYPOS() { + return FIXUP_FLAG_FIX_SCHEME_TYPOS; + }, + + getFixupURIInfo(uriString, fixupFlags = FIXUP_FLAG_NONE) { + let isPrivateContext = fixupFlags & FIXUP_FLAG_PRIVATE_CONTEXT; + + // Eliminate embedded newlines, which single-line text fields now allow, + // and cleanup the empty spaces and tabs that might be on each end. + uriString = uriString.trim().replace(lazy.newLinesRegex, ""); + + if (!uriString) { + throw new Components.Exception( + "Should pass a non-null uri", + Cr.NS_ERROR_FAILURE + ); + } + + let info = new URIFixupInfo(uriString); + + const { scheme, fixedSchemeUriString, fixupChangedProtocol } = + extractScheme(uriString, fixupFlags); + uriString = fixedSchemeUriString; + info.fixupChangedProtocol = fixupChangedProtocol; + + if (scheme == "view-source") { + let { preferredURI, postData } = fixupViewSource(uriString, fixupFlags); + info.preferredURI = info.fixedURI = preferredURI; + info.postData = postData; + return info; + } + + if (scheme.length < 2) { + // Check if it is a file path. We skip most schemes because the only case + // where a file path may look like having a scheme is "X:" on Windows. + let fileURI = fileURIFixup(uriString); + if (fileURI) { + info.preferredURI = info.fixedURI = fileURI; + info.fixupChangedProtocol = true; + return info; + } + } + + const isCommonProtocol = COMMON_PROTOCOLS.includes(scheme); + + let canHandleProtocol = + scheme && + (isCommonProtocol || + Services.io.getProtocolHandler(scheme) != lazy.defaultProtocolHandler || + this._isKnownExternalProtocol(scheme)); + + if ( + canHandleProtocol || + // If it's an unknown handler and the given URL looks like host:port or + // has a user:password we can't pass it to the external protocol handler. + // We'll instead try fixing it with http later. + (!lazy.possiblyHostPortRegex.test(uriString) && + !lazy.userPasswordRegex.test(uriString)) + ) { + // Just try to create an URL out of it. + try { + info.fixedURI = Services.io.newURI(uriString); + } catch (ex) { + if (ex.result != Cr.NS_ERROR_MALFORMED_URI) { + throw ex; + } + } + } + + // We're dealing with a theoretically valid URI but we have no idea how to + // load it. (e.g. "christmas:humbug") + // It's more likely the user wants to search, and so we chuck this over to + // their preferred search provider. + // TODO (Bug 1588118): Should check FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP + // instead of FIXUP_FLAG_FIX_SCHEME_TYPOS. + if ( + info.fixedURI && + lazy.keywordEnabled && + fixupFlags & FIXUP_FLAG_FIX_SCHEME_TYPOS && + scheme && + !canHandleProtocol + ) { + tryKeywordFixupForURIInfo(uriString, info, isPrivateContext); + } + + if (info.fixedURI) { + if (!info.preferredURI) { + maybeSetAlternateFixedURI(info, fixupFlags); + info.preferredURI = info.fixedURI; + } + fixupConsecutiveDotsHost(info); + return info; + } + + // Fix up protocol string before calling KeywordURIFixup, because + // it cares about the hostname of such URIs. + // Prune duff protocol schemes: + // ://totallybroken.url.com + // //shorthand.url.com + let inputHadDuffProtocol = + uriString.startsWith("://") || uriString.startsWith("//"); + if (inputHadDuffProtocol) { + uriString = uriString.replace(/^:?\/\//, ""); + } + + // Avoid fixing up content that looks like tab-separated values. + // Assume that 1 tab is accidental, but more than 1 implies this is + // supposed to be tab-separated content. + if (!isCommonProtocol && lazy.maxOneTabRegex.test(uriString)) { + let uriWithProtocol = fixupURIProtocol(uriString); + if (uriWithProtocol) { + info.fixedURI = uriWithProtocol; + info.fixupChangedProtocol = true; + maybeSetAlternateFixedURI(info, fixupFlags); + info.preferredURI = info.fixedURI; + // Check if it's a forced visit. The user can enforce a visit by + // appending a slash, but the string must be in a valid uri format. + if (uriString.endsWith("/")) { + fixupConsecutiveDotsHost(info); + return info; + } + } + } + + // Handle "www.<something>" as a URI. + const asciiHost = info.fixedURI?.asciiHost; + if ( + asciiHost?.length > 4 && + asciiHost?.startsWith("www.") && + asciiHost?.lastIndexOf(".") == 3 + ) { + return info; + } + + // Memoize the public suffix check, since it may be expensive and should + // only run once when necessary. + let suffixInfo; + function checkSuffix(info) { + if (!suffixInfo) { + suffixInfo = checkAndFixPublicSuffix(info); + } + return suffixInfo; + } + + // See if it is a keyword and whether a keyword must be fixed up. + if ( + lazy.keywordEnabled && + fixupFlags & FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP && + !inputHadDuffProtocol && + !checkSuffix(info).suffix && + keywordURIFixup(uriString, info, isPrivateContext) + ) { + fixupConsecutiveDotsHost(info); + return info; + } + + if ( + info.fixedURI && + (!info.fixupChangedProtocol || !checkSuffix(info).hasUnknownSuffix) + ) { + fixupConsecutiveDotsHost(info); + return info; + } + + // If we still haven't been able to construct a valid URI, try to force a + // keyword match. + if (lazy.keywordEnabled && fixupFlags & FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP) { + tryKeywordFixupForURIInfo(info.originalInput, info, isPrivateContext); + } + + if (!info.preferredURI) { + // We couldn't salvage anything. + throw new Components.Exception( + "Couldn't build a valid uri", + Cr.NS_ERROR_MALFORMED_URI + ); + } + + fixupConsecutiveDotsHost(info); + return info; + }, + + webNavigationFlagsToFixupFlags(href, navigationFlags) { + try { + Services.io.newURI(href); + // Remove LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP for valid uris. + navigationFlags &= + ~Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP; + } catch (ex) {} + + let fixupFlags = FIXUP_FLAG_NONE; + if ( + navigationFlags & Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP + ) { + fixupFlags |= FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP; + } + if (navigationFlags & Ci.nsIWebNavigation.LOAD_FLAGS_FIXUP_SCHEME_TYPOS) { + fixupFlags |= FIXUP_FLAG_FIX_SCHEME_TYPOS; + } + return fixupFlags; + }, + + keywordToURI(keyword, isPrivateContext) { + if (Services.appinfo.processType == Ci.nsIXULRuntime.PROCESS_TYPE_CONTENT) { + // There's no search service in the content process, thus all the calls + // from it that care about keywords conversion should go through the + // parent process. + throw new Components.Exception( + "Can't invoke URIFixup in the content process", + Cr.NS_ERROR_NOT_AVAILABLE + ); + } + let info = new URIFixupInfo(keyword); + + // Strip leading "?" and leading/trailing spaces from aKeyword + if (keyword.startsWith("?")) { + keyword = keyword.substring(1); + } + keyword = keyword.trim(); + + if (!Services.search.hasSuccessfullyInitialized) { + return info; + } + + // Try falling back to the search service's default search engine + // We must use an appropriate search engine depending on the private + // context. + let engine = isPrivateContext + ? Services.search.defaultPrivateEngine + : Services.search.defaultEngine; + + // We allow default search plugins to specify alternate parameters that are + // specific to keyword searches. + let responseType = null; + if (engine.supportsResponseType("application/x-moz-keywordsearch")) { + responseType = "application/x-moz-keywordsearch"; + } + let submission = engine.getSubmission(keyword, responseType, "keyword"); + if ( + !submission || + // For security reasons (avoid redirecting to file, data, or other unsafe + // protocols) we only allow fixup to http/https search engines. + !submission.uri.scheme.startsWith("http") + ) { + throw new Components.Exception( + "Invalid search submission uri", + Cr.NS_ERROR_NOT_AVAILABLE + ); + } + let submissionPostDataStream = submission.postData; + if (submissionPostDataStream) { + info.postData = submissionPostDataStream; + } + + info.keywordProviderName = engine.name; + info.keywordAsSent = keyword; + info.preferredURI = submission.uri; + return info; + }, + + forceHttpFixup(uriString) { + if (!uriString) { + throw new Components.Exception( + "Should pass a non-null uri", + Cr.NS_ERROR_FAILURE + ); + } + + let info = new URIFixupInfo(uriString); + let { scheme, fixedSchemeUriString, fixupChangedProtocol } = extractScheme( + uriString, + FIXUP_FLAG_FIX_SCHEME_TYPOS + ); + + if (scheme != "http" && scheme != "https") { + throw new Components.Exception( + "Scheme should be either http or https", + Cr.NS_ERROR_FAILURE + ); + } + + info.fixupChangedProtocol = fixupChangedProtocol; + info.fixedURI = Services.io.newURI(fixedSchemeUriString); + + let host = info.fixedURI.host; + if (host != "http" && host != "https" && host != "localhost") { + let modifiedHostname = maybeAddPrefixAndSuffix(host); + updateHostAndScheme(info, modifiedHostname); + info.preferredURI = info.fixedURI; + } + + return info; + }, + + checkHost(uri, listener, originAttributes) { + let { displayHost, asciiHost } = uri; + if (!displayHost) { + throw new Components.Exception( + "URI must have displayHost", + Cr.NS_ERROR_FAILURE + ); + } + if (!asciiHost) { + throw new Components.Exception( + "URI must have asciiHost", + Cr.NS_ERROR_FAILURE + ); + } + + let isIPv4Address = host => { + let parts = host.split("."); + if (parts.length != 4) { + return false; + } + return parts.every(part => { + let n = parseInt(part, 10); + return n >= 0 && n <= 255; + }); + }; + + // Avoid showing fixup information if we're suggesting an IP. Note that + // decimal representations of IPs are normalized to a 'regular' + // dot-separated IP address by network code, but that only happens for + // numbers that don't overflow. Longer numbers do not get normalized, + // but still work to access IP addresses. So for instance, + // 1097347366913 (ff7f000001) gets resolved by using the final bytes, + // making it the same as 7f000001, which is 127.0.0.1 aka localhost. + // While 2130706433 would get normalized by network, 1097347366913 + // does not, and we have to deal with both cases here: + if (isIPv4Address(asciiHost) || /^(?:\d+|0x[a-f0-9]+)$/i.test(asciiHost)) { + return; + } + + // For dotless hostnames, we want to ensure this ends with a '.' but don't + // want the . showing up in the UI if we end up notifying the user, so we + // use a separate variable. + let lookupName = displayHost; + if (lazy.dnsResolveFullyQualifiedNames && !lookupName.includes(".")) { + lookupName += "."; + } + + Services.obs.notifyObservers(null, "uri-fixup-check-dns"); + Services.dns.asyncResolve( + lookupName, + Ci.nsIDNSService.RESOLVE_TYPE_DEFAULT, + 0, + null, + listener, + Services.tm.mainThread, + originAttributes + ); + }, + + isDomainKnown, + + _isKnownExternalProtocol(scheme) { + if (this._trustExternalProtocolService) { + return lazy.externalProtocolService.externalProtocolHandlerExists(scheme); + } + + try { + // nsIExternalProtocolService.getProtocolHandlerInfo() on Android throws + // error due to not implemented. + return lazy.handlerService.exists( + lazy.externalProtocolService.getProtocolHandlerInfo(scheme) + ); + } catch (e) { + return false; + } + }, + + classID: Components.ID("{c6cf88b7-452e-47eb-bdc9-86e3561648ef}"), + QueryInterface: ChromeUtils.generateQI(["nsIURIFixup"]), +}; + +export function URIFixupInfo(originalInput = "") { + this._originalInput = originalInput; +} + +URIFixupInfo.prototype = { + set consumer(consumer) { + this._consumer = consumer || null; + }, + get consumer() { + return this._consumer || null; + }, + + set preferredURI(uri) { + this._preferredURI = uri; + }, + get preferredURI() { + return this._preferredURI || null; + }, + + set fixedURI(uri) { + this._fixedURI = uri; + }, + get fixedURI() { + return this._fixedURI || null; + }, + + set keywordProviderName(name) { + this._keywordProviderName = name; + }, + get keywordProviderName() { + return this._keywordProviderName || ""; + }, + + set keywordAsSent(keyword) { + this._keywordAsSent = keyword; + }, + get keywordAsSent() { + return this._keywordAsSent || ""; + }, + + set fixupChangedProtocol(changed) { + this._fixupChangedProtocol = changed; + }, + get fixupChangedProtocol() { + return !!this._fixupChangedProtocol; + }, + + set fixupCreatedAlternateURI(changed) { + this._fixupCreatedAlternateURI = changed; + }, + get fixupCreatedAlternateURI() { + return !!this._fixupCreatedAlternateURI; + }, + + set originalInput(input) { + this._originalInput = input; + }, + get originalInput() { + return this._originalInput || ""; + }, + + set postData(postData) { + this._postData = postData; + }, + get postData() { + return this._postData || null; + }, + + classID: Components.ID("{33d75835-722f-42c0-89cc-44f328e56a86}"), + QueryInterface: ChromeUtils.generateQI(["nsIURIFixupInfo"]), +}; + +// Helpers + +/** + * Implementation of isDomainKnown, so we don't have to go through the + * service. + * @param {string} asciiHost + * @returns {boolean} whether the domain is known + */ +function isDomainKnown(asciiHost) { + if (lazy.dnsFirstForSingleWords) { + return true; + } + // Check if this domain is known as an actual + // domain (which will prevent a keyword query) + // Note that any processing of the host here should stay in sync with + // code in the front-end(s) that set the pref. + let lastDotIndex = asciiHost.lastIndexOf("."); + if (lastDotIndex == asciiHost.length - 1) { + asciiHost = asciiHost.substring(0, asciiHost.length - 1); + lastDotIndex = asciiHost.lastIndexOf("."); + } + if (lazy.knownDomains.has(asciiHost.toLowerCase())) { + return true; + } + // If there's no dot or only a leading dot we are done, otherwise we'll check + // against the known suffixes. + if (lastDotIndex <= 0) { + return false; + } + // Don't use getPublicSuffix here, since the suffix is not in the PSL, + // thus it couldn't tell if the suffix is made up of one or multiple + // dot-separated parts. + let lastPart = asciiHost.substr(lastDotIndex + 1); + let suffixes = lazy.knownSuffixes.get(lastPart); + if (suffixes) { + return Array.from(suffixes).some(s => asciiHost.endsWith(s)); + } + return false; +} + +/** + * Checks the suffix of info.fixedURI against the Public Suffix List. + * If the suffix is unknown due to a typo this will try to fix it up. + * @param {URIFixupInfo} info about the uri to check. + * @note this may modify the public suffix of info.fixedURI. + * @returns {object} result The lookup result. + * @returns {string} result.suffix The public suffix if one can be identified. + * @returns {boolean} result.hasUnknownSuffix True when the suffix is not in the + * Public Suffix List and it's not in knownSuffixes. False in the other cases. + */ +function checkAndFixPublicSuffix(info) { + let uri = info.fixedURI; + let asciiHost = uri?.asciiHost; + if ( + !asciiHost || + !asciiHost.includes(".") || + asciiHost.endsWith(".") || + isDomainKnown(asciiHost) + ) { + return { suffix: "", hasUnknownSuffix: false }; + } + + // Quick bailouts for most common cases, according to Alexa Top 1 million. + if ( + /^\w/.test(asciiHost) && + (asciiHost.endsWith(".com") || + asciiHost.endsWith(".net") || + asciiHost.endsWith(".org") || + asciiHost.endsWith(".ru") || + asciiHost.endsWith(".de")) + ) { + return { + suffix: asciiHost.substring(asciiHost.lastIndexOf(".") + 1), + hasUnknownSuffix: false, + }; + } + try { + let suffix = Services.eTLD.getKnownPublicSuffix(uri); + if (suffix) { + return { suffix, hasUnknownSuffix: false }; + } + } catch (ex) { + return { suffix: "", hasUnknownSuffix: false }; + } + // Suffix is unknown, try to fix most common 3 chars TLDs typos. + // .com is the most commonly mistyped tld, so it has more cases. + let suffix = Services.eTLD.getPublicSuffix(uri); + if (!suffix || lazy.numberRegex.test(suffix)) { + return { suffix: "", hasUnknownSuffix: false }; + } + for (let [typo, fixed] of [ + ["ocm", "com"], + ["con", "com"], + ["cmo", "com"], + ["xom", "com"], + ["vom", "com"], + ["cpm", "com"], + ["com'", "com"], + ["ent", "net"], + ["ner", "net"], + ["nte", "net"], + ["met", "net"], + ["rog", "org"], + ["ogr", "org"], + ["prg", "org"], + ["orh", "org"], + ]) { + if (suffix == typo) { + let host = uri.host.substring(0, uri.host.length - typo.length) + fixed; + let updatePreferredURI = info.preferredURI == info.fixedURI; + info.fixedURI = uri.mutate().setHost(host).finalize(); + if (updatePreferredURI) { + info.preferredURI = info.fixedURI; + } + return { suffix: fixed, hasUnknownSuffix: false }; + } + } + return { suffix: "", hasUnknownSuffix: true }; +} + +function tryKeywordFixupForURIInfo(uriString, fixupInfo, isPrivateContext) { + try { + let keywordInfo = Services.uriFixup.keywordToURI( + uriString, + isPrivateContext + ); + fixupInfo.keywordProviderName = keywordInfo.keywordProviderName; + fixupInfo.keywordAsSent = keywordInfo.keywordAsSent; + fixupInfo.preferredURI = keywordInfo.preferredURI; + return true; + } catch (ex) {} + return false; +} + +/** + * This generates an alternate fixedURI, by adding a prefix and a suffix to + * the fixedURI host, if and only if the protocol is http. It should _never_ + * modify URIs with other protocols. + * @param {URIFixupInfo} info an URIInfo object + * @param {integer} fixupFlags the fixup flags + * @returns {boolean} Whether an alternate uri was generated + */ +function maybeSetAlternateFixedURI(info, fixupFlags) { + let uri = info.fixedURI; + let canUseAlternate = + fixupFlags & FIXUP_FLAG_FORCE_ALTERNATE_URI || + (lazy.alternateEnabled && fixupFlags & FIXUP_FLAGS_MAKE_ALTERNATE_URI); + if ( + !canUseAlternate || + // Code only works for http. Not for any other protocol including https! + !uri.schemeIs("http") || + // Security - URLs with user / password info should NOT be fixed up + uri.userPass || + // Don't fix up hosts with ports + uri.port != -1 + ) { + return false; + } + + let oldHost = uri.host; + // Don't create an alternate uri for localhost, because it would be confusing. + // Ditto for 'http' and 'https' as these are frequently the result of typos, e.g. + // 'https//foo' (note missing : ). + if (oldHost == "localhost" || oldHost == "http" || oldHost == "https") { + return false; + } + + // Get the prefix and suffix to stick onto the new hostname. By default these + // are www. & .com but they could be any other value, e.g. www. & .org + let newHost = maybeAddPrefixAndSuffix(oldHost); + + if (newHost == oldHost) { + return false; + } + + return updateHostAndScheme(info, newHost); +} + +/** + * Try to fixup a file URI. + * @param {string} uriString The file URI to fix. + * @returns {nsIURI} a fixed uri or null. + * @note FileURIFixup only returns a URI if it has to add the file: protocol. + */ +function fileURIFixup(uriString) { + let attemptFixup = false; + let path = uriString; + if (AppConstants.platform == "win") { + // Check for "\"" in the url-string, just a drive (e.g. C:), + // or 'A:/...' where the "protocol" is also a single letter. + attemptFixup = + uriString.includes("\\") || + (uriString[1] == ":" && (uriString.length == 2 || uriString[2] == "/")); + if (uriString[1] == ":" && uriString[2] == "/") { + path = uriString.replace(/\//g, "\\"); + } + } else { + // UNIX: Check if it starts with "/". + attemptFixup = uriString.startsWith("/"); + } + if (attemptFixup) { + try { + // Test if this is a valid path by trying to create a local file + // object. The URL of that is returned if successful. + let file = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsIFile); + file.initWithPath(path); + return Services.io.newURI( + lazy.fileProtocolHandler.getURLSpecFromActualFile(file) + ); + } catch (ex) { + // Not a file uri. + } + } + return null; +} + +/** + * Tries to fixup a string to an nsIURI by adding the default protocol. + * + * Should fix things like: + * no-scheme.com + * ftp.no-scheme.com + * ftp4.no-scheme.com + * no-scheme.com/query?foo=http://www.foo.com + * user:pass@no-scheme.com + * + * @param {string} uriString The string to fixup. + * @returns {nsIURI} an nsIURI built adding the default protocol to the string, + * or null if fixing was not possible. + */ +function fixupURIProtocol(uriString) { + let schemePos = uriString.indexOf("://"); + if (schemePos == -1 || schemePos > uriString.search(/[:\/]/)) { + uriString = "http://" + uriString; + } + try { + return Services.io.newURI(uriString); + } catch (ex) { + // We generated an invalid uri. + } + return null; +} + +/** + * Tries to fixup a string to a search url. + * @param {string} uriString the string to fixup. + * @param {URIFixupInfo} fixupInfo The fixup info object, modified in-place. + * @param {boolean} isPrivateContext Whether this happens in a private context. + * @param {nsIInputStream} postData optional POST data for the search + * @returns {boolean} Whether the keyword fixup was succesful. + */ +function keywordURIFixup(uriString, fixupInfo, isPrivateContext) { + // Here is a few examples of strings that should be searched: + // "what is mozilla" + // "what is mozilla?" + // "docshell site:mozilla.org" - has a space in the origin part + // "?site:mozilla.org - anything that begins with a question mark + // "mozilla'.org" - Things that have a quote before the first dot/colon + // "mozilla/test" - unknown host + // ".mozilla", "mozilla." - starts or ends with a dot () + // "user@nonQualifiedHost" + + // These other strings should not be searched, because they could be URIs: + // "www.blah.com" - Domain with a standard or known suffix + // "knowndomain" - known domain + // "nonQualifiedHost:8888?something" - has a port + // "user:pass@nonQualifiedHost" + // "blah.com." + + // We do keyword lookups if the input starts with a question mark. + if (uriString.startsWith("?")) { + return tryKeywordFixupForURIInfo( + fixupInfo.originalInput, + fixupInfo, + isPrivateContext + ); + } + + // Check for IPs. + const userPassword = lazy.userPasswordRegex.exec(uriString); + const ipString = userPassword + ? uriString.replace(userPassword[2], "") + : uriString; + if (lazy.IPv4LikeRegex.test(ipString) || lazy.IPv6LikeRegex.test(ipString)) { + return false; + } + + // Avoid keyword lookup if we can identify a host and it's known, or ends + // with a dot and has some path. + // Note that if dnsFirstForSingleWords is true isDomainKnown will always + // return true, so we can avoid checking dnsFirstForSingleWords after this. + let asciiHost = fixupInfo.fixedURI?.asciiHost; + if ( + asciiHost && + (isDomainKnown(asciiHost) || + (asciiHost.endsWith(".") && + asciiHost.indexOf(".") != asciiHost.length - 1)) + ) { + return false; + } + + // Avoid keyword lookup if the url seems to have password. + if (fixupInfo.fixedURI?.password) { + return false; + } + + // Even if the host is unknown, avoid keyword lookup if the string has + // uri-like characteristics, unless it looks like "user@unknownHost". + // Note we already excluded passwords at this point. + if ( + !isURILike(uriString, fixupInfo.fixedURI?.displayHost) || + (fixupInfo.fixedURI?.userPass && fixupInfo.fixedURI?.pathQueryRef === "/") + ) { + return tryKeywordFixupForURIInfo( + fixupInfo.originalInput, + fixupInfo, + isPrivateContext + ); + } + + return false; +} + +/** + * Mimics the logic in Services.io.extractScheme, but avoids crossing XPConnect. + * This also tries to fixup the scheme if it was clearly mistyped. + * @param {string} uriString the string to examine + * @param {integer} fixupFlags The original fixup flags + * @returns {object} + * scheme: a typo fixed scheme or empty string if one could not be identified + * fixedSchemeUriString: uri string with a typo fixed scheme + * fixupChangedProtocol: true if the scheme is fixed up + */ +function extractScheme(uriString, fixupFlags = FIXUP_FLAG_NONE) { + const matches = uriString.match(lazy.possibleProtocolRegex); + const hasColon = matches?.[2] === ":"; + const hasSlash2 = matches?.[3] === "//"; + + const isFixupSchemeTypos = + lazy.fixupSchemeTypos && fixupFlags & FIXUP_FLAG_FIX_SCHEME_TYPOS; + + if ( + !matches || + (!hasColon && !hasSlash2) || + (!hasColon && !isFixupSchemeTypos) + ) { + return { + scheme: "", + fixedSchemeUriString: uriString, + fixupChangedProtocol: false, + }; + } + + let scheme = matches[1].replace("\t", "").toLowerCase(); + let fixedSchemeUriString = uriString; + + if (isFixupSchemeTypos && hasSlash2) { + // Fix up typos for string that user would have intented as protocol. + const afterProtocol = uriString.substring(matches[0].length); + fixedSchemeUriString = `${scheme}://${afterProtocol}`; + } + + let fixupChangedProtocol = false; + + if (isFixupSchemeTypos) { + // Fix up common scheme typos. + // TODO: Use levenshtein distance here? + fixupChangedProtocol = [ + ["ttp", "http"], + ["htp", "http"], + ["ttps", "https"], + ["tps", "https"], + ["ps", "https"], + ["htps", "https"], + ["ile", "file"], + ["le", "file"], + ].some(([typo, fixed]) => { + if (scheme === typo) { + scheme = fixed; + fixedSchemeUriString = + scheme + fixedSchemeUriString.substring(typo.length); + return true; + } + return false; + }); + } + + return { + scheme, + fixedSchemeUriString, + fixupChangedProtocol, + }; +} + +/** + * View-source is a pseudo scheme. We're interested in fixing up the stuff + * after it. The easiest way to do that is to call this method again with + * the "view-source:" lopped off and then prepend it again afterwards. + * @param {string} uriString The original string to fixup + * @param {integer} fixupFlags The original fixup flags + * @param {nsIInputStream} postData Optional POST data for the search + * @returns {object} {preferredURI, postData} The fixed URI and relative postData + * @throws if it's not possible to fixup the url + */ +function fixupViewSource(uriString, fixupFlags) { + // We disable keyword lookup and alternate URIs so that small typos don't + // cause us to look at very different domains. + let newFixupFlags = + fixupFlags & + ~FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP & + ~FIXUP_FLAGS_MAKE_ALTERNATE_URI; + + let innerURIString = uriString.substring(12).trim(); + + // Prevent recursion. + const { scheme: innerScheme } = extractScheme(innerURIString); + if (innerScheme == "view-source") { + throw new Components.Exception( + "Prevent view-source recursion", + Cr.NS_ERROR_FAILURE + ); + } + + let info = Services.uriFixup.getFixupURIInfo(innerURIString, newFixupFlags); + if (!info.preferredURI) { + throw new Components.Exception( + "Couldn't build a valid uri", + Cr.NS_ERROR_MALFORMED_URI + ); + } + return { + preferredURI: Services.io.newURI("view-source:" + info.preferredURI.spec), + postData: info.postData, + }; +} + +/** + * Fixup the host of fixedURI if it contains consecutive dots. + * @param {URIFixupInfo} info an URIInfo object + */ +function fixupConsecutiveDotsHost(fixupInfo) { + const uri = fixupInfo.fixedURI; + + try { + if (!uri?.host.includes("..")) { + return; + } + } catch (e) { + return; + } + + try { + const isPreferredEqualsToFixed = fixupInfo.preferredURI?.equals(uri); + + fixupInfo.fixedURI = uri + .mutate() + .setHost(uri.host.replace(/\.+/g, ".")) + .finalize(); + + if (isPreferredEqualsToFixed) { + fixupInfo.preferredURI = fixupInfo.fixedURI; + } + } catch (e) { + if (e.result !== Cr.NS_ERROR_MALFORMED_URI) { + throw e; + } + } +} + +/** + * Return whether or not given string is uri like. + * This function returns true like following strings. + * - ":8080" + * - "localhost:8080" (if given host is "localhost") + * - "/foo?bar" + * - "/foo#bar" + * @param {string} uriString. + * @param {string} host. + * @param {boolean} true if uri like. + */ +function isURILike(uriString, host) { + const indexOfSlash = uriString.indexOf("/"); + if ( + indexOfSlash >= 0 && + (indexOfSlash < uriString.indexOf("?", indexOfSlash) || + indexOfSlash < uriString.indexOf("#", indexOfSlash)) + ) { + return true; + } + + if (uriString.startsWith(host)) { + uriString = uriString.substring(host.length); + } + + return lazy.portRegex.test(uriString); +} + +/** + * Add prefix and suffix to a hostname if both are missing. + * + * If the host does not start with the prefix, add the prefix to + * the hostname. + * + * By default the prefix and suffix are www. and .com but they could + * be any value e.g. www. and .org as they use the preferences + * "browser.fixup.alternate.prefix" and "browser.fixup.alternative.suffix" + * + * If no changes were made, it returns an empty string. + * + * @param {string} oldHost. + * @return {String} Fixed up hostname or an empty string. + */ +function maybeAddPrefixAndSuffix(oldHost) { + let prefix = Services.prefs.getCharPref( + "browser.fixup.alternate.prefix", + "www." + ); + let suffix = Services.prefs.getCharPref( + "browser.fixup.alternate.suffix", + ".com" + ); + let newHost = ""; + let numDots = (oldHost.match(/\./g) || []).length; + if (numDots == 0) { + newHost = prefix + oldHost + suffix; + } else if (numDots == 1) { + if (prefix && oldHost == prefix) { + newHost = oldHost + suffix; + } else if (suffix && !oldHost.startsWith(prefix)) { + newHost = prefix + oldHost; + } + } + return newHost ? newHost : oldHost; +} + +/** + * Given an instance of URIFixupInfo, update its fixedURI. + * + * First, change the protocol to the one stored in + * "browser.fixup.alternate.protocol". + * + * Then, try to update fixedURI's host to newHost. + * + * @param {URIFixupInfo} info. + * @param {string} newHost. + * @return {boolean} + * True, if info was updated without any errors. + * False, if NS_ERROR_MALFORMED_URI error. + * @throws If a non-NS_ERROR_MALFORMED_URI error occurs. + */ +function updateHostAndScheme(info, newHost) { + let oldHost = info.fixedURI.host; + let oldScheme = info.fixedURI.scheme; + try { + info.fixedURI = info.fixedURI + .mutate() + .setScheme(lazy.alternateProtocol) + .setHost(newHost) + .finalize(); + } catch (ex) { + if (ex.result != Cr.NS_ERROR_MALFORMED_URI) { + throw ex; + } + return false; + } + if (oldScheme != info.fixedURI.scheme) { + info.fixupChangedProtocol = true; + } + if (oldHost != info.fixedURI.host) { + info.fixupCreatedAlternateURI = true; + } + return true; +} |