1 // Copyright 2014 The Chromium OS Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include <brillo/dbus/utils.h>
6
7 #include <tuple>
8 #include <vector>
9
10 #include <base/bind.h>
11 #include <brillo/errors/error_codes.h>
12 #include <brillo/strings/string_utils.h>
13
14 namespace brillo {
15 namespace dbus_utils {
16
CreateDBusErrorResponse(dbus::MethodCall * method_call,const std::string & error_name,const std::string & error_message)17 std::unique_ptr<dbus::Response> CreateDBusErrorResponse(
18 dbus::MethodCall* method_call,
19 const std::string& error_name,
20 const std::string& error_message) {
21 return dbus::ErrorResponse::FromMethodCall(method_call, error_name,
22 error_message);
23 }
24
GetDBusError(dbus::MethodCall * method_call,const brillo::Error * error)25 std::unique_ptr<dbus::Response> GetDBusError(dbus::MethodCall* method_call,
26 const brillo::Error* error) {
27 CHECK(error) << "Error object must be specified";
28 std::string error_name = DBUS_ERROR_FAILED; // Default error code.
29 std::string error_message;
30
31 // Special case for "dbus" error domain.
32 // Pop the error code and message from the error chain and use them as the
33 // actual D-Bus error message.
34 if (error->GetDomain() == errors::dbus::kDomain) {
35 error_name = error->GetCode();
36 error_message = error->GetMessage();
37 error = error->GetInnerError();
38 }
39
40 // Append any inner errors to the error message.
41 while (error) {
42 // Format error string as "domain/code:message".
43 if (!error_message.empty())
44 error_message += ';';
45 error_message +=
46 error->GetDomain() + '/' + error->GetCode() + ':' + error->GetMessage();
47 error = error->GetInnerError();
48 }
49 return CreateDBusErrorResponse(method_call, error_name, error_message);
50 }
51
AddDBusError(brillo::ErrorPtr * error,const std::string & dbus_error_name,const std::string & dbus_error_message)52 void AddDBusError(brillo::ErrorPtr* error,
53 const std::string& dbus_error_name,
54 const std::string& dbus_error_message) {
55 std::vector<std::string> parts = string_utils::Split(dbus_error_message, ";");
56 std::vector<std::tuple<std::string, std::string, std::string>> errors;
57 for (const std::string& part : parts) {
58 // Each part should be in format of "domain/code:message"
59 size_t slash_pos = part.find('/');
60 size_t colon_pos = part.find(':');
61 if (slash_pos != std::string::npos && colon_pos != std::string::npos &&
62 slash_pos < colon_pos) {
63 // If we have both '/' and ':' and in proper order, then we have a
64 // correctly encoded error object.
65 std::string domain = part.substr(0, slash_pos);
66 std::string code = part.substr(slash_pos + 1, colon_pos - slash_pos - 1);
67 std::string message = part.substr(colon_pos + 1);
68 errors.emplace_back(domain, code, message);
69 } else if (slash_pos == std::string::npos &&
70 colon_pos == std::string::npos && errors.empty()) {
71 // If we don't have both '/' and ':' and this is the first error object,
72 // then we had a D-Bus error at the top of the error chain.
73 errors.emplace_back(errors::dbus::kDomain, dbus_error_name, part);
74 } else {
75 // We have a malformed part. The whole D-Bus error was most likely
76 // not generated by GetDBusError(). To be safe, stop parsing it
77 // and return the error as received from D-Bus.
78 errors.clear(); // Remove any errors accumulated so far.
79 errors.emplace_back(
80 errors::dbus::kDomain, dbus_error_name, dbus_error_message);
81 break;
82 }
83 }
84
85 // Go backwards and add the parsed errors to the error chain.
86 for (auto it = errors.crbegin(); it != errors.crend(); ++it) {
87 Error::AddTo(
88 error, FROM_HERE, std::get<0>(*it), std::get<1>(*it), std::get<2>(*it));
89 }
90 }
91
92 } // namespace dbus_utils
93 } // namespace brillo
94