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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file contains utilities related to working with "facets".
//
// A "facet" is defined as the manifestation of a logical application on a given
// platform. For example, "My Bank" may have released an Android application
// and a Web application accessible from a browser. These are all facets of the
// "My Bank" logical application.
//
// Facets that belong to the same logical application are said to be affiliated
// with each other. Conceptually, "affiliations" can be seen as an equivalence
// relation defined over the set of all facets. Each equivalence class contains
// facets that belong to the same logical application, and therefore should be
// treated as synonymous for certain purposes, e.g., sharing credentials.
//
// A valid facet identifier will be a URI of the form:
//
// * https://<host>[:<port>]
//
// For web sites. Only HTTPS sites are supported. The syntax corresponds to
// that of 'serialized-origin' in RFC 6454. That is, in canonical form, the
// URI must not contain components other than the scheme (required, must be
// "https"), host (required), and port (optional); with canonicalization
// performed the same way as it normally would be for standard URLs.
//
// * android://<certificate_hash>@<package_name>
//
// For Android applications. In canonical form, the URI must not contain
// components other than the scheme (must be "android"), username, and host
// (all required). The host part must be a valid Android package name, with
// no escaping, so it must be composed of characters [a-zA-Z0-9_.].
//
// The username part must be the hash of the certificate used to sign the
// APK, base64-encoded using padding and the "URL and filename safe" base64
// alphabet, with no further escaping. This is normally calculated as:
//
// echo -n -e "$PEM_KEY" |
// openssl x509 -outform DER |
// openssl sha -sha512 -binary | base64 | tr '+/' '-_'
//
#ifndef COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_AFFILIATION_UTILS_H_
#define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_AFFILIATION_UTILS_H_
#include <iosfwd>
#include <string>
#include <vector>
#include <stddef.h>
#include "base/containers/hash_tables.h"
#include "base/logging.h"
#include "base/strings/utf_string_conversions.h"
#include "base/time/time.h"
#include "url/third_party/mozilla/url_parse.h"
namespace autofill {
struct PasswordForm;
} // namespace autofill
namespace password_manager {
// Encapsulates a facet URI in canonical form.
//
// This is a very light-weight wrapper around an std::string containing the text
// of the URI, and can be passed around as a value. The main rationale for the
// existance of this class is to make it clearer in the code when a certain URI
// is known to be a valid facet URI in canonical form, and to allow verifying
// and converting URIs to such canonical form.
//
// Note that it would be impractical to use GURL to represent facet URIs, as
// GURL has built-in logic to parse the rest of the URI according to its scheme,
// and obviously, it does not recognize the "android" scheme. Therefore, after
// parsing, everything ends up in the path component, which is not too helpful.
class FacetURI {
public:
FacetURI();
// As a light-weight std::string wrapper, allow copy and assign.
FacetURI(const FacetURI&) = default;
FacetURI& operator=(const FacetURI&) = default;
// Constructs an instance to encapsulate the canonical form of |spec|.
// If |spec| is not a valid facet URI, then an invalid instance is returned,
// which then should be discarded.
static FacetURI FromPotentiallyInvalidSpec(const std::string& spec);
// Constructs a valid FacetURI instance from a valid |canonical_spec|.
// Note: The passed-in URI is not verified at all. Use only when you are sure
// the URI is valid and in canonical form.
static FacetURI FromCanonicalSpec(const std::string& canonical_spec);
// Comparison operators so that FacetURI can be used in std::equal.
bool operator==(const FacetURI& other) const;
bool operator!=(const FacetURI& other) const;
// Relational operators so that FacetURI can be used in sorted containers.
bool operator<(const FacetURI& other) const;
bool operator>(const FacetURI& other) const;
// Returns whether or not this instance represents a valid facet identifier
// referring to a Web application.
bool IsValidWebFacetURI() const;
// Returns whether or not this instance represents a valid facet identifier
// referring to an Android application.
bool IsValidAndroidFacetURI() const;
// Returns whether or not this instance represents a valid facet identifier
// referring to either a Web or an Android application. The empty identfier is
// not considered valid.
bool is_valid() const { return is_valid_; }
// Returns whether or not this instance represents the empty facet identifier.
bool is_empty() const { return canonical_spec_.empty(); }
// Returns the canonical scheme of the encapsulated facet URI, provided it is
// valid, or the empty string otherwise.
std::string scheme() const;
// Returns the canonical package name that the encapsulated facet URI
// references, provided it is a valid Android facet URI, or the empty string
// otherwise.
std::string android_package_name() const;
// Returns the text of the encapsulated canonical URI, which must be valid.
const std::string& canonical_spec() const {
DCHECK(is_valid_);
return canonical_spec_;
}
// Returns the text of the encapsulated canonical URI, even if it is invalid.
const std::string& potentially_invalid_spec() const {
return canonical_spec_;
}
private:
// Internal constructor to be used by the static factory methods.
FacetURI(const std::string& canonical_spec, bool is_valid);
// Whether |canonical_spec_| contains a valid facet URI in canonical form.
bool is_valid_;
// The text of the encapsulated canonical URI, valid if and only if
// |is_valid_| is true.
std::string canonical_spec_;
// Identified components of the canonical spec.
url::Parsed parsed_;
};
// A collection of facets affiliated with each other, i.e. an equivalence class.
typedef std::vector<FacetURI> AffiliatedFacets;
// A collection of facets affiliated with each other, i.e. an equivalence class,
// plus a timestamp that indicates the last time the data was updated from an
// authoritative source.
struct AffiliatedFacetsWithUpdateTime {
AffiliatedFacetsWithUpdateTime();
AffiliatedFacetsWithUpdateTime(const AffiliatedFacetsWithUpdateTime& other);
~AffiliatedFacetsWithUpdateTime();
AffiliatedFacets facets;
base::Time last_update_time;
};
// Returns whether or not equivalence classes |a| and |b| are equal, that is,
// whether or not they consist of the same set of facets.
//
// Note that this will do some sorting, so it can be expensive for large inputs.
bool AreEquivalenceClassesEqual(const AffiliatedFacets& a,
const AffiliatedFacets& b);
// A shorter way to spell FacetURI::IsValidAndroidFacetURI().
bool IsValidAndroidFacetURI(const std::string& uri);
// Returns the origin URI in a format which can be presented to a user based of
// |password_from| field values.
std::string GetHumanReadableOrigin(const autofill::PasswordForm& password_form);
// Returns the Android origin URI for presenting to a user.
std::string GetHumanReadableOriginForAndroidUri(const FacetURI facet_uri);
// For logging use only.
std::ostream& operator<<(std::ostream& os, const FacetURI& facet_uri);
struct FacetURIHash {
size_t operator()(const FacetURI& facet_uri) const {
return std::hash<std::string>()(facet_uri.potentially_invalid_spec());
}
};
} // namespace password_manager
#endif // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_AFFILIATION_UTILS_H_
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