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a4b62ff Sep 24, 2017
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@miloyip @yurikhan
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// Schema Validator example
// The example validates JSON text from stdin with a JSON schema specified in the argument.
#include "rapidjson/error/en.h"
#include "rapidjson/filereadstream.h"
#include "rapidjson/schema.h"
#include "rapidjson/stringbuffer.h"
#include "rapidjson/prettywriter.h"
using namespace rapidjson;
int main(int argc, char *argv[]) {
if (argc != 2) {
fprintf(stderr, "Usage: schemavalidator schema.json < input.json\n");
return EXIT_FAILURE;
}
// Read a JSON schema from file into Document
Document d;
char buffer[4096];
{
FILE *fp = fopen(argv[1], "r");
if (!fp) {
printf("Schema file '%s' not found\n", argv[1]);
return -1;
}
FileReadStream fs(fp, buffer, sizeof(buffer));
d.ParseStream(fs);
if (d.HasParseError()) {
fprintf(stderr, "Schema file '%s' is not a valid JSON\n", argv[1]);
fprintf(stderr, "Error(offset %u): %s\n",
static_cast<unsigned>(d.GetErrorOffset()),
GetParseError_En(d.GetParseError()));
fclose(fp);
return EXIT_FAILURE;
}
fclose(fp);
}
// Then convert the Document into SchemaDocument
SchemaDocument sd(d);
// Use reader to parse the JSON in stdin, and forward SAX events to validator
SchemaValidator validator(sd);
Reader reader;
FileReadStream is(stdin, buffer, sizeof(buffer));
if (!reader.Parse(is, validator) && reader.GetParseErrorCode() != kParseErrorTermination) {
// Schema validator error would cause kParseErrorTermination, which will handle it in next step.
fprintf(stderr, "Input is not a valid JSON\n");
fprintf(stderr, "Error(offset %u): %s\n",
static_cast<unsigned>(reader.GetErrorOffset()),
GetParseError_En(reader.GetParseErrorCode()));
}
// Check the validation result
if (validator.IsValid()) {
printf("Input JSON is valid.\n");
return EXIT_SUCCESS;
}
else {
printf("Input JSON is invalid.\n");
StringBuffer sb;
validator.GetInvalidSchemaPointer().StringifyUriFragment(sb);
fprintf(stderr, "Invalid schema: %s\n", sb.GetString());
fprintf(stderr, "Invalid keyword: %s\n", validator.GetInvalidSchemaKeyword());
sb.Clear();
validator.GetInvalidDocumentPointer().StringifyUriFragment(sb);
fprintf(stderr, "Invalid document: %s\n", sb.GetString());
// Detailed violation report is available as a JSON value
sb.Clear();
PrettyWriter<StringBuffer> w(sb);
validator.GetError().Accept(w);
fprintf(stderr, "Error report:\n%s\n", sb.GetString());
return EXIT_FAILURE;
}
}