| 1 | //======================================================================== |
|---|---|
| 2 | // |
| 3 | // CryptoSignBackend.cc |
| 4 | // |
| 5 | // This file is licensed under the GPLv2 or later |
| 6 | // |
| 7 | // Copyright 2023 g10 Code GmbH, Author: Sune Stolborg Vuorela <sune@vuorela.dk> |
| 8 | //======================================================================== |
| 9 | #include "CryptoSignBackend.h" |
| 10 | #include "config.h" |
| 11 | #ifdef ENABLE_GPGME |
| 12 | # include "GPGMECryptoSignBackend.h" |
| 13 | #endif |
| 14 | #ifdef ENABLE_NSS3 |
| 15 | # include "NSSCryptoSignBackend.h" |
| 16 | #endif |
| 17 | |
| 18 | namespace CryptoSign { |
| 19 | |
| 20 | void Factory::setPreferredBackend(CryptoSign::Backend::Type backend) |
| 21 | { |
| 22 | preferredBackend = backend; |
| 23 | } |
| 24 | static std::string_view toStringView(const char *str) |
| 25 | { |
| 26 | if (str) { |
| 27 | return std::string_view(str); |
| 28 | } |
| 29 | return {}; |
| 30 | } |
| 31 | |
| 32 | std::optional<CryptoSign::Backend::Type> Factory::typeFromString(std::string_view string) |
| 33 | { |
| 34 | if (string.empty()) { |
| 35 | return std::nullopt; |
| 36 | } |
| 37 | if ("GPG"== string) { |
| 38 | return Backend::Type::GPGME; |
| 39 | } |
| 40 | if ("NSS"== string) { |
| 41 | return Backend::Type::NSS3; |
| 42 | } |
| 43 | return std::nullopt; |
| 44 | } |
| 45 | |
| 46 | std::optional<CryptoSign::Backend::Type> Factory::getActive() |
| 47 | { |
| 48 | if (preferredBackend) { |
| 49 | return *preferredBackend; |
| 50 | } |
| 51 | static auto backendFromEnvironment = typeFromString(string: toStringView(str: getenv(name: "POPPLER_SIGNATURE_BACKEND"))); |
| 52 | if (backendFromEnvironment) { |
| 53 | return *backendFromEnvironment; |
| 54 | } |
| 55 | static auto backendFromCompiledDefault = typeFromString(string: toStringView(DEFAULT_SIGNATURE_BACKEND)); |
| 56 | if (backendFromCompiledDefault) { |
| 57 | return *backendFromCompiledDefault; |
| 58 | } |
| 59 | |
| 60 | return std::nullopt; |
| 61 | } |
| 62 | static std::vector<Backend::Type> createAvailableBackends() |
| 63 | { |
| 64 | std::vector<Backend::Type> backends; |
| 65 | #ifdef ENABLE_NSS3 |
| 66 | backends.push_back(x: Backend::Type::NSS3); |
| 67 | #endif |
| 68 | #ifdef ENABLE_GPGME |
| 69 | if (GpgSignatureBackend::hasSufficientVersion()) { |
| 70 | backends.push_back(Backend::Type::GPGME); |
| 71 | } |
| 72 | #endif |
| 73 | return backends; |
| 74 | } |
| 75 | std::vector<Backend::Type> Factory::getAvailable() |
| 76 | { |
| 77 | static std::vector<Backend::Type> availableBackends = createAvailableBackends(); |
| 78 | return availableBackends; |
| 79 | } |
| 80 | std::unique_ptr<Backend> Factory::createActive() |
| 81 | { |
| 82 | auto active = getActive(); |
| 83 | if (active) { |
| 84 | return create(active.value()); |
| 85 | } |
| 86 | return nullptr; |
| 87 | } |
| 88 | std::unique_ptr<CryptoSign::Backend> CryptoSign::Factory::create(Backend::Type backend) |
| 89 | { |
| 90 | switch (backend) { |
| 91 | case Backend::Type::NSS3: |
| 92 | #ifdef ENABLE_NSS3 |
| 93 | return std::make_unique<NSSCryptoSignBackend>(); |
| 94 | #else |
| 95 | return nullptr; |
| 96 | #endif |
| 97 | case Backend::Type::GPGME: { |
| 98 | #ifdef ENABLE_GPGME |
| 99 | return std::make_unique<GpgSignatureBackend>(); |
| 100 | #else |
| 101 | return nullptr; |
| 102 | #endif |
| 103 | } |
| 104 | } |
| 105 | return nullptr; |
| 106 | } |
| 107 | /// backend specific settings |
| 108 | |
| 109 | // Android build wants some methods out of line in the interfaces |
| 110 | Backend::~Backend() = default; |
| 111 | SigningInterface::~SigningInterface() = default; |
| 112 | VerificationInterface::~VerificationInterface() = default; |
| 113 | |
| 114 | std::optional<Backend::Type> Factory::preferredBackend = std::nullopt; |
| 115 | |
| 116 | } // namespace Signature; |
| 117 |