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#include "StarJsonPatch.hpp"
#include "StarJsonPath.hpp"
#include "StarLexicalCast.hpp"
namespace Star {
Json jsonPatch(Json const& base, JsonArray const& patch) {
auto res = base;
try {
for (auto const& operation : patch) {
res = JsonPatching::applyOperation(res, operation);
}
return res;
} catch (JsonException const& e) {
throw JsonPatchException(strf("Could not apply patch to base. {}", e.what()));
}
}
namespace JsonPatching {
static const StringMap<std::function<Json(Json, Json)>> functionMap = StringMap<std::function<Json(Json, Json)>>{
{"test", std::bind(applyTestOperation, _1, _2)},
{"remove", std::bind(applyRemoveOperation, _1, _2)},
{"add", std::bind(applyAddOperation, _1, _2)},
{"replace", std::bind(applyReplaceOperation, _1, _2)},
{"move", std::bind(applyMoveOperation, _1, _2)},
{"copy", std::bind(applyCopyOperation, _1, _2)},
{"merge", std::bind(applyMergeOperation, _1, _2)},
};
Json applyOperation(Json const& base, Json const& op) {
try {
auto operation = op.getString("op");
return JsonPatching::functionMap.get(operation)(base, op);
} catch (JsonException const& e) {
throw JsonPatchException(strf("Could not apply operation to base. {}", e.what()));
} catch (MapException const&) {
throw JsonPatchException(strf("Invalid operation: {}", op.getString("op")));
}
}
Json applyTestOperation(Json const& base, Json const& op) {
auto path = op.getString("path");
auto inverseTest = op.getBool("inverse", false);
auto pointer = JsonPath::Pointer(path);
try {
if (op.contains("search")) {
Json searchArray = pointer.get(base);
Json searchValue = op.get("search");
if (searchArray.type() == Json::Type::Array) {
bool found = false;
for(auto& v : searchArray.toArray()) {
if (jsonCompare(v, searchValue)) {
found = true;
break;
}
}
if (found) {
if (inverseTest)
throw JsonPatchTestFail(strf("Test operation failure, expected {} to be missing.", searchValue));
return base;
} else {
if (!inverseTest)
throw JsonPatchTestFail(strf("Test operation failure, could not find {}.", searchValue));
return base;
}
} else {
throw JsonPatchException(strf("Search operation failure, value at '{}' is not an array.", path));
}
} else {
auto value = op.opt("value");
auto testValue = pointer.get(base);
if (!value) {
if (inverseTest)
throw JsonPatchTestFail(strf("Test operation failure, expected {} to be missing.", op.getString("path")));
return base;
}
if ((value && (testValue == *value)) ^ inverseTest) {
return base;
}
throw JsonPatchTestFail(strf("Test operation failure, expected {} found {}.", value, testValue));
}
} catch (JsonPath::TraversalException& e) {
if (inverseTest)
return base;
throw JsonPatchTestFail(strf("Test operation failure: {}", e.what()));
}
}
Json applyRemoveOperation(Json const& base, Json const& op) {
if (op.contains("search")) {
String path = op.getString("path");
auto pointer = JsonPath::Pointer(path);
Json searchArray = pointer.get(base);
Json searchValue = op.get("search");
if (searchArray.type() == Json::Type::Array) {
size_t index = 0;
bool found = false;
for (auto& v : searchArray.toArray()) {
if (jsonCompare(v, searchValue)) {
found = true;
break;
}
index++;
}
if (found)
searchArray = searchArray.eraseIndex(index);
return pointer.add(pointer.remove(base), searchArray);
} else {
throw JsonPatchException(strf("Search operation failure, value at {} is not an array.", path));
}
} else {
return JsonPath::Pointer(op.getString("path")).remove(base);
}
}
Json applyAddOperation(Json const& base, Json const& op) {
if (op.contains("search")) {
Json value = op.get("value");
String path = op.getString("path");
auto pointer = JsonPath::Pointer(path);
Json searchArray = pointer.get(base);
Json searchValue = op.get("search");
if (searchArray.type() == Json::Type::Array) {
bool found = false;
for (auto& v : searchArray.toArray()) {
if (jsonCompare(v, searchValue)) {
found = true;
break;
}
}
if (found)
searchArray = searchArray.append(value);
return pointer.add(pointer.remove(base), searchArray);
} else {
throw JsonPatchException(strf("Search operation failure, value at {} is not an array.", path));
}
} else {
return JsonPath::Pointer(op.getString("path")).add(base, op.get("value"));
}
}
Json applyReplaceOperation(Json const& base, Json const& op) {
String path = op.getString("path");
auto pointer = JsonPath::Pointer(op.getString("path"));
if (op.contains("search")) {
Json value = op.get("value");
Json searchArray = pointer.get(base);
Json searchValue = op.get("search");
if (searchArray.type() == Json::Type::Array) {
size_t index = 0;
bool found = false;
for (auto& v : searchArray.toArray()) {
if (jsonCompare(v, searchValue)) {
found = true;
break;
}
index++;
}
if (found)
searchArray = searchArray.set(index, value);
return pointer.add(pointer.remove(base), searchArray);
} else {
throw JsonPatchException(strf("Search operation failure, value at {} is not an array.", path));
}
} else {
return pointer.add(pointer.remove(base), op.get("value"));
}
}
Json applyMoveOperation(Json const& base, Json const& op) {
String path = op.getString("path");
auto toPointer = JsonPath::Pointer(path);
auto fromPointer = JsonPath::Pointer(op.getString("from"));
if (op.contains("search")) {
Json value = op.get("value");
Json searchArray = fromPointer.get(base);
Json searchValue = op.get("search");
if (searchArray.type() == Json::Type::Array) {
size_t index = 0;
bool found = false;
for (auto& v : searchArray.toArray()) {
if (jsonCompare(v, searchValue)) {
found = true;
break;
}
index++;
}
if (found) {
toPointer.add(toPointer.remove(base), searchArray.get(index));
searchArray = searchArray.eraseIndex(index);
fromPointer.add(fromPointer.remove(base), searchArray);
}
return toPointer.get(base);
} else {
throw JsonPatchException(strf("Search operation failure, value at {} is not an array.", path));
}
} else {
Json value = fromPointer.get(base);
return toPointer.add(fromPointer.remove(base), value);
}
}
Json applyCopyOperation(Json const& base, Json const& op) {
String path = op.getString("path");
auto toPointer = JsonPath::Pointer(path);
auto fromPointer = JsonPath::Pointer(op.getString("from"));
if (op.contains("search")) {
Json value = op.get("value");
Json searchArray = fromPointer.get(base);
Json searchValue = op.get("search");
if (searchArray.type() == Json::Type::Array) {
size_t index = 0;
bool found = false;
for (auto& v : searchArray.toArray()) {
if (jsonCompare(v, searchValue)) {
found = true;
break;
}
index++;
}
if (found)
toPointer.add(base, searchArray.get(index));
return toPointer.get(base);
} else {
throw JsonPatchException(strf("Search operation failure, value at {} is not an array.", path));
}
} else {
Json value = fromPointer.get(base);
return toPointer.add(base, fromPointer.get(base));
}
}
Json applyMergeOperation(Json const& base, Json const& op) {
String path = op.getString("path");
auto pointer = JsonPath::Pointer(op.getString("path"));
if (op.contains("search")) {
Json value = op.get("value");
Json searchArray = pointer.get(base);
Json searchValue = op.get("search");
if (searchArray.type() == Json::Type::Array) {
size_t index = 0;
bool found = false;
for (auto& v : searchArray.toArray()) {
if (jsonCompare(v, searchValue)) {
found = true;
break;
}
index++;
}
if (found)
searchArray = searchArray.set(index, jsonMerge(searchArray.get(index), op.get("value")));
return pointer.add(pointer.remove(base), searchArray);
} else {
throw JsonPatchException(strf("Search operation failure, value at {} is not an array.", path));
}
} else {
return pointer.add(pointer.remove(base), jsonMerge(pointer.get(base), op.get("value")));
}
}
}
}
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