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import is from '@sindresorhus/is';
import type {
ArgumentNode,
DefinitionNode,
DocumentNode,
FieldNode,
OperationDefinitionNode,
SelectionNode,
SelectionSetNode,
TypeNode,
ValueNode,
VariableDefinitionNode,
} from 'graphql/language';
import { Kind, parse } from 'graphql/language';
function isOperationDefinitionNode(
def: DefinitionNode,
): def is OperationDefinitionNode {
return def.kind === Kind.OPERATION_DEFINITION;
}
function isFieldNode(sel: SelectionNode): sel is FieldNode {
return sel.kind === Kind.FIELD;
}
interface Arguments {
[key: string]:
| string
| boolean
| null
| Arguments
| (string | boolean | null | Arguments)[];
}
type Variables = Record<string, string>;
interface SelectionSet {
__vars?: Variables;
__args?: Arguments;
[key: string]: undefined | null | SelectionSet | Arguments;
}
interface GraphqlSnapshot {
query?: SelectionSet;
mutation?: SelectionSet;
subscription?: SelectionSet;
variables?: Record<string, string>;
}
function getArguments(key: string, val: ValueNode): Arguments {
const result: Arguments = {};
const kind = val.kind;
if (
val.kind === Kind.INT ||
val.kind === Kind.FLOAT ||
val.kind === Kind.STRING ||
val.kind === Kind.BOOLEAN ||
val.kind === Kind.ENUM
) {
result[key] = val.value;
} else if (val.kind === Kind.OBJECT) {
let childResult: Arguments = {};
val.fields.forEach((fieldNode) => {
const childKey = fieldNode.name.value;
const childVal = getArguments(childKey, fieldNode.value);
childResult = { ...childResult, ...childVal };
});
result[key] = childResult;
} else if (val.kind === Kind.LIST) {
const results: Arguments[] = [];
val.values.forEach((fieldNode) => {
results.push(getArguments(key, fieldNode));
});
result[key] = results.map(({ [key]: x }) => x).flat();
} else if (val.kind === Kind.NULL) {
result[key] = null;
} else if (val.kind === Kind.VARIABLE) {
result[key] = `$${val.name.value}`;
} else {
result[key] = `<<${kind}>>`;
}
return result;
}
function simplifyArguments(
argNodes?: ReadonlyArray<ArgumentNode>,
): Arguments | null {
if (argNodes) {
let result: Arguments = {};
argNodes.forEach((argNode) => {
const name = argNode.name.value;
const valNode = argNode.value;
result = {
...result,
...getArguments(name, valNode),
};
});
return result;
}
return null;
}
function simplifySelectionSet(
selectionSet: SelectionSetNode,
parentArgs: Arguments | null,
parentVars: Variables | null,
): SelectionSet {
const result: SelectionSet = {};
selectionSet.selections.forEach((selectionNode) => {
if (isFieldNode(selectionNode)) {
const name = selectionNode.name.value;
const args = simplifyArguments(selectionNode.arguments);
const childSelectionSet = selectionNode.selectionSet;
if (parentVars && !is.emptyObject(parentVars)) {
result.__vars = parentVars;
}
if (parentArgs && !is.emptyObject(parentArgs)) {
result.__args = parentArgs;
}
result[name] = childSelectionSet
? simplifySelectionSet(childSelectionSet, args, null)
: null;
}
});
return result;
}
function getTypeName(typeNode: TypeNode): string {
const kind = typeNode.kind;
if (typeNode.kind === Kind.NAMED_TYPE) {
return typeNode.name.value;
}
const childTypeNode = typeNode.type;
const childTypeName = getTypeName(childTypeNode);
if (kind === Kind.LIST_TYPE) {
return `[${childTypeName}]`;
}
if (kind === Kind.NON_NULL_TYPE) {
return `${childTypeName}!`;
}
return `<<${kind}>>`;
}
function simplifyVariableDefinitions(
varNodes: ReadonlyArray<VariableDefinitionNode> | null,
): Variables {
const result: Variables = {};
if (varNodes) {
varNodes.forEach((varNode) => {
const key = `$${varNode.variable.name.value}`;
const typeNode = varNode.type;
const typeName = getTypeName(typeNode);
result[key] = typeName;
});
}
return result;
}
function simplifyGraphqlTree(tree: DocumentNode): GraphqlSnapshot {
const result: GraphqlSnapshot = {};
const { definitions } = tree;
definitions.forEach((def) => {
if (isOperationDefinitionNode(def)) {
const { operation, selectionSet, variableDefinitions = null } = def;
const vars = simplifyVariableDefinitions(variableDefinitions);
result[operation] = simplifySelectionSet(selectionSet, null, vars);
}
});
return result;
}
export interface GraphqlSnapshotInput {
query: string;
variables: Record<string, string>;
}
export function makeGraphqlSnapshot(
requestBody: GraphqlSnapshotInput,
): GraphqlSnapshot | null {
try {
const { query: queryStr, variables } = requestBody;
if (!queryStr) {
return null;
}
const queryRawTree = parse(queryStr, { noLocation: true });
const queryTree = simplifyGraphqlTree(queryRawTree);
if (variables) {
return { variables, ...queryTree };
}
return queryTree;
} catch {
return null;
}
}
|
