ceph/src/rapidjson/example/schemavalidator/schemavalidator.cpp

   1 // Schema Validator example
   2
   3 // The example validates JSON text from stdin with a JSON schema specified in the argument.
   4
   5 #include "rapidjson/error/en.h"
   6 #include "rapidjson/filereadstream.h"
   7 #include "rapidjson/schema.h"
   8 #include "rapidjson/stringbuffer.h"
   9
  10 using namespace rapidjson;
  11
  12 int main(int argc, char *argv[]) {
  13     if (argc != 2) {
  14         fprintf(stderr, "Usage: schemavalidator schema.json < input.json\n");
  15         return EXIT_FAILURE;
  16     }
  17
  18     // Read a JSON schema from file into Document
  19     Document d;
  20     char buffer[4096];
  21
  22     {
  23         FILE *fp = fopen(argv[1], "r");
  24         if (!fp) {
  25             printf("Schema file '%s' not found\n", argv[1]);
  26             return -1;
  27         }
  28         FileReadStream fs(fp, buffer, sizeof(buffer));
  29         d.ParseStream(fs);
  30         if (d.HasParseError()) {
  31             fprintf(stderr, "Schema file '%s' is not a valid JSON\n", argv[1]);
  32             fprintf(stderr, "Error(offset %u): %s\n",
  33                 static_cast<unsigned>(d.GetErrorOffset()),
  34                 GetParseError_En(d.GetParseError()));
  35             fclose(fp);
  36             return EXIT_FAILURE;
  37         }
  38         fclose(fp);
  39     }
  40
  41     // Then convert the Document into SchemaDocument
  42     SchemaDocument sd(d);
  43
  44     // Use reader to parse the JSON in stdin, and forward SAX events to validator
  45     SchemaValidator validator(sd);
  46     Reader reader;
  47     FileReadStream is(stdin, buffer, sizeof(buffer));
  48     if (!reader.Parse(is, validator) && reader.GetParseErrorCode() != kParseErrorTermination) {
  49         // Schema validator error would cause kParseErrorTermination, which will handle it in next step.
  50         fprintf(stderr, "Input is not a valid JSON\n");
  51         fprintf(stderr, "Error(offset %u): %s\n",
  52             static_cast<unsigned>(reader.GetErrorOffset()),
  53             GetParseError_En(reader.GetParseErrorCode()));
  54     }
  55
  56     // Check the validation result
  57     if (validator.IsValid()) {
  58         printf("Input JSON is valid.\n");
  59         return EXIT_SUCCESS;
  60     }
  61     else {
  62         printf("Input JSON is invalid.\n");
  63         StringBuffer sb;
  64         validator.GetInvalidSchemaPointer().StringifyUriFragment(sb);
  65         fprintf(stderr, "Invalid schema: %s\n", sb.GetString());
  66         fprintf(stderr, "Invalid keyword: %s\n", validator.GetInvalidSchemaKeyword());
  67         sb.Clear();
  68         validator.GetInvalidDocumentPointer().StringifyUriFragment(sb);
  69         fprintf(stderr, "Invalid document: %s\n", sb.GetString());
  70         return EXIT_FAILURE;
  71     }
  72 }