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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()), false);
}
}
// Returns 0 if not found, index + 1 if found.
size_t findJsonMatch(Json const& searchable, Json const& value, JsonPath::Pointer& pointer) {
if (searchable.isType(Json::Type::Array)) {
auto array = searchable.toArray();
for (size_t i = 0; i != array.size(); ++i) {
if (jsonPartialMatch(array[i], value))
return i + 1;
}
} else {
throw JsonPatchException(strf("Search operation failure, value at '{}' is not an array.", pointer.path()), false);
}
return 0;
}
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, Maybe<Json> const& external) {
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()), false);
} catch (MapException const&) {
throw JsonPatchException(strf("Invalid operation: {}", op.getString("op")), false);
}
}
Json applyTestOperation(Json const& base, Json const& op) {
String path = op.getString("path");
auto pointer = JsonPath::Pointer(path);
auto inverseTest = op.getBool("inverse", false);
try {
if (op.contains("search")) {
auto searchable = pointer.get(base);
auto searchValue = op.get("search");
bool found = findJsonMatch(searchable, searchValue, pointer);
if (found && inverseTest)
throw JsonPatchTestFail(strf("Test operation failure, expected {} to be missing.", searchValue), false);
else if (!found && !inverseTest)
throw JsonPatchTestFail(strf("Test operation failure, could not find {}.", searchValue), false);
return base;
} 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.", path), false);
return base;
}
if ((value && (testValue == *value)) ^ inverseTest)
return base;
else
throw JsonPatchTestFail(strf("Test operation failure, expected {} found {}.", value, testValue), false);
}
} catch (JsonPath::TraversalException& e) {
if (inverseTest)
return base;
throw JsonPatchTestFail(strf("Test operation failure: {}", e.what()), false);
}
}
Json applyRemoveOperation(Json const& base, Json const& op) {
String path = op.getString("path");
auto pointer = JsonPath::Pointer(path);
if (op.contains("search")) {
auto searchable = pointer.get(base);
auto searchValue = op.get("search");
if (size_t index = findJsonMatch(searchable, searchValue, pointer))
return pointer.add(pointer.remove(base), searchable.eraseIndex(index - 1));
else
return base;
} else {
return pointer.remove(base);
}
}
Json applyAddOperation(Json const& base, Json const& op) {
String path = op.getString("path");
auto value = op.get("value");
auto pointer = JsonPath::Pointer(path);
if (op.contains("search")) {
auto searchable = pointer.get(base);
auto searchValue = op.get("search");
if (size_t index = findJsonMatch(searchable, searchValue, pointer))
return pointer.add(pointer.remove(base), searchable.insert(index - 1, value));
else
return base;
} else {
return pointer.add(base, value);
}
}
Json applyReplaceOperation(Json const& base, Json const& op) {
String path = op.getString("path");
auto value = op.get("value");
auto pointer = JsonPath::Pointer(op.getString("path"));
if (op.contains("search")) {
auto searchable = pointer.get(base);
auto searchValue = op.get("search");
if (size_t index = findJsonMatch(searchable, searchValue, pointer))
return pointer.add(pointer.remove(base), searchable.set(index - 1, value));
else
return base;
} else {
return pointer.add(pointer.remove(base), 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")) {
auto searchable = fromPointer.get(base);
auto searchValue = op.get("search");
if (size_t index = findJsonMatch(searchable, searchValue, fromPointer)) {
auto result = toPointer.add(base, searchable.get(index - 1));
return fromPointer.add(result, searchable.eraseIndex(index - 1));
}
else
return base;
} 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")) {
auto searchable = fromPointer.get(base);
auto searchValue = op.get("search");
if (size_t index = findJsonMatch(searchable, searchValue, fromPointer))
return toPointer.add(base, searchable.get(index - 1));
else
return base;
} else {
Json value = fromPointer.get(base);
return toPointer.add(base, value);
}
}
Json applyMergeOperation(Json const& base, Json const& op) {
String path = op.getString("path");
auto pointer = JsonPath::Pointer(path);
if (op.contains("search")) {
auto searchable = pointer.get(base);
auto searchValue = op.get("search");
if (size_t index = findJsonMatch(searchable, searchValue, pointer))
return pointer.add(pointer.remove(base), searchable.set(index - 1, jsonMerge(searchable.get(index - 1), op.get("value"))));
else
return base;
} else {
return pointer.add(pointer.remove(base), jsonMerge(pointer.get(base), op.get("value")));
}
}
}
}
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