Class: JSON::Validator

Inherits:
Object
  • Object
show all
Defined in:
lib/json-schema/validator.rb

Constant Summary collapse

@@schemas = 
{}
@@cache_schemas = 
false
@@default_opts = 
{
  :list => false,
  :version => nil,
  :validate_schema => false,
  :record_errors => false,
  :errors_as_objects => false,
  :insert_defaults => false
}
@@validators = 
{}
@@default_validator = 
nil
@@available_json_backends = 
[]
@@json_backend = 
'yajl'
@@serializer = 
lambda{|o| Marshal.dump(o) }
@@mutex = 
Mutex.new

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(schema_data, data, opts = {}) ⇒ Validator

Returns a new instance of Validator.



144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
 
# File 'lib/json-schema/validator.rb', line 144

def initialize(schema_data, data, opts={})
  @options = @@default_opts.clone.merge(opts)
  @errors = []

  # I'm not a fan of this, but it's quick and dirty to get it working for now
  version_string = "draft-04"
  if @options[:version]
    version_string = @options[:version] = self.class.version_string_for(@options[:version])
    u = URI.parse("http://json-schema.org/#{@options[:version]}/schema#")
    validator = JSON::Validator.validators["#{u.scheme}://#{u.host}#{u.path}"]
    @options[:version] = validator
  end

  @validation_options = @options[:record_errors] ? {:record_errors => true} : {}
  @validation_options[:insert_defaults] = true if @options[:insert_defaults]

  @@mutex.synchronize { @base_schema = initialize_schema(schema_data) }
  @data = initialize_data(data)
  @@mutex.synchronize { build_schemas(@base_schema) }

  # validate the schema, if requested
  if @options[:validate_schema]
    begin
      if @base_schema.schema["$schema"]
        version_string = @options[:version] = self.class.version_string_for(@base_schema.schema["$schema"])
      end
      meta_validator = JSON::Validator.new(self.class.metaschema_for(version_string), @base_schema.schema)
      meta_validator.validate
    rescue JSON::Schema::ValidationError, JSON::Schema::SchemaError
      raise $!
    end
  end

  # If the :fragment option is set, try and validate against the fragment
  if opts[:fragment]
    @base_schema = schema_from_fragment(@base_schema, opts[:fragment])
  end
end

Class Method Details

.add_schema(schema) ⇒ Object 



415
416
417
 
# File 'lib/json-schema/validator.rb', line 415

def add_schema(schema)
  @@schemas[schema.uri.to_s] = schema if @@schemas[schema.uri.to_s].nil?
end

.cache_schemas=(val) ⇒ Object 



419
420
421
 
# File 'lib/json-schema/validator.rb', line 419

def cache_schemas=(val)
  @@cache_schemas = val == true ? true : false
end

.clear_cache ⇒ Object 



407
408
409
 
# File 'lib/json-schema/validator.rb', line 407

def clear_cache
  @@schemas = {} if @@cache_schemas == false
end

.default_validator ⇒ Object 



427
428
429
 
# File 'lib/json-schema/validator.rb', line 427

def default_validator
  @@default_validator
end

.fully_validate(schema, data, opts = {}) ⇒ Object 



387
388
389
390
391
 
# File 'lib/json-schema/validator.rb', line 387

def fully_validate(schema, data, opts={})
  opts[:record_errors] = true
  validator = JSON::Validator.new(schema, data, opts)
  validator.validate
end

.fully_validate_json(schema, data, opts = {}) ⇒ Object 



399
400
401
 
# File 'lib/json-schema/validator.rb', line 399

def fully_validate_json(schema, data, opts={})
  fully_validate(schema, data, opts.merge(:json => true))
end

.fully_validate_schema(schema, opts = {}) ⇒ Object 



393
394
395
396
397
 
# File 'lib/json-schema/validator.rb', line 393

def fully_validate_schema(schema, opts={})
  data = schema
  schema = metaschema_for(version_string_for(opts[:version]))
  fully_validate(schema, data, opts)
end

.fully_validate_uri(schema, data, opts = {}) ⇒ Object 



403
404
405
 
# File 'lib/json-schema/validator.rb', line 403

def fully_validate_uri(schema, data, opts={})
  fully_validate(schema, data, opts.merge(:uri => true))
end

.json_backend ⇒ Object 



439
440
441
442
443
444
445
 
# File 'lib/json-schema/validator.rb', line 439

def json_backend
  if defined?(MultiJson)
    MultiJson.respond_to?(:adapter) ? MultiJson.adapter : MultiJson.engine
  else
    @@json_backend
  end
end

.json_backend=(backend) ⇒ Object 



447
448
449
450
451
452
453
454
455
456
457
458
459
 
# File 'lib/json-schema/validator.rb', line 447

def json_backend=(backend)
  if defined?(MultiJson)
    backend = backend == 'json' ? 'json_gem' : backend
    MultiJson.respond_to?(:use) ? MultiJson.use(backend) : MultiJson.engine = backend
  else
    backend = backend.to_s
    if @@available_json_backends.include?(backend)
      @@json_backend = backend
    else
      raise JSON::Schema::JsonParseError.new("The JSON backend '#{backend}' could not be found.")
    end
  end
end

.metaschema_for(version_string) ⇒ Object 



140
141
142
 
# File 'lib/json-schema/validator.rb', line 140

def self.metaschema_for(version_string)
  File.join(Pathname.new(File.dirname(__FILE__)).parent.parent, "resources", "#{version_string}.json").to_s
end

.parse(s) ⇒ Object 



461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
 
# File 'lib/json-schema/validator.rb', line 461

def parse(s)
  if defined?(MultiJson)
    MultiJson.respond_to?(:adapter) ? MultiJson.load(s) : MultiJson.decode(s)
  else
    case @@json_backend.to_s
    when 'json'
      JSON.parse(s)
    when 'yajl'
      json = StringIO.new(s)
      parser = Yajl::Parser.new
      parser.parse(json)
    else
      raise JSON::Schema::JsonParseError.new("No supported JSON parsers found. The following parsers are suported:\n * yajl-ruby\n * json")
    end
  end
end

.register_default_validator(v) ⇒ Object 



435
436
437
 
# File 'lib/json-schema/validator.rb', line 435

def register_default_validator(v)
  @@default_validator = v
end

.register_validator(v) ⇒ Object 



431
432
433
 
# File 'lib/json-schema/validator.rb', line 431

def register_validator(v)
  @@validators[v.to_s] = v
end

.schemas ⇒ Object 



411
412
413
 
# File 'lib/json-schema/validator.rb', line 411

def schemas
  @@schemas
end

.validate(schema, data, opts = {}) ⇒ Object 



354
355
356
357
358
359
360
361
362
 
# File 'lib/json-schema/validator.rb', line 354

def validate(schema, data,opts={})
  begin
    validator = JSON::Validator.new(schema, data, opts)
    validator.validate
    return true
  rescue JSON::Schema::ValidationError, JSON::Schema::SchemaError
    return false
  end
end

.validate!(schema, data, opts = {}) ⇒ Object Also known as: validate2 



372
373
374
375
376
 
# File 'lib/json-schema/validator.rb', line 372

def validate!(schema, data,opts={})
  validator = JSON::Validator.new(schema, data, opts)
  validator.validate
  return true
end

.validate_json(schema, data, opts = {}) ⇒ Object 



364
365
366
 
# File 'lib/json-schema/validator.rb', line 364

def validate_json(schema, data, opts={})
  validate(schema, data, opts.merge(:json => true))
end

.validate_json!(schema, data, opts = {}) ⇒ Object 



379
380
381
 
# File 'lib/json-schema/validator.rb', line 379

def validate_json!(schema, data, opts={})
  validate!(schema, data, opts.merge(:json => true))
end

.validate_uri(schema, data, opts = {}) ⇒ Object 



368
369
370
 
# File 'lib/json-schema/validator.rb', line 368

def validate_uri(schema, data, opts={})
  validate(schema, data, opts.merge(:uri => true))
end

.validate_uri!(schema, data, opts = {}) ⇒ Object 



383
384
385
 
# File 'lib/json-schema/validator.rb', line 383

def validate_uri!(schema, data, opts={})
  validate!(schema, data, opts.merge(:uri => true))
end

.validators ⇒ Object 



423
424
425
 
# File 'lib/json-schema/validator.rb', line 423

def validators
  @@validators
end

.version_string_for(version) ⇒ Object 



123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
 
# File 'lib/json-schema/validator.rb', line 123

def self.version_string_for(version)
  # I'm not a fan of this, but it's quick and dirty to get it working for now
  return "draft-04" unless version
  case version.to_s
  when "draft4", "http://json-schema.org/draft-04/schema#"
    "draft-04"
  when "draft3", "http://json-schema.org/draft-03/schema#"
    "draft-03"
  when "draft2"
    "draft-02"
  when "draft1"
    "draft-01"
  else
    raise JSON::Schema::SchemaError.new("The requested JSON schema version is not supported")
  end
end

Instance Method Details

#build_schemas(parent_schema) ⇒ Object

Build all schemas with IDs, mapping out the namespace



265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
 
# File 'lib/json-schema/validator.rb', line 265

def build_schemas(parent_schema)
  # Build ref schemas if they exist
  if parent_schema.schema["$ref"]
    load_ref_schema(parent_schema, parent_schema.schema["$ref"])
  end
  if parent_schema.schema["extends"]
    if parent_schema.schema["extends"].is_a?(String)
      load_ref_schema(parent_schema, parent_schema.schema["extends"])
    elsif parent_schema.schema["extends"].is_a?(Array)
      parent_schema.schema["extends"].each do |type|
        handle_schema(parent_schema, type)
      end
    end
  end

  # Check for schemas in union types
  ["type", "disallow"].each do |key|
    if parent_schema.schema[key] && parent_schema.schema[key].is_a?(Array)
      parent_schema.schema[key].each_with_index do |type,i|
        if type.is_a?(Hash)
          handle_schema(parent_schema, type)
        end
      end
    end
  end

  # "definitions" are schemas in V4
  if parent_schema.schema["definitions"]
    parent_schema.schema["definitions"].each do |k,v|
      handle_schema(parent_schema, v)
    end
  end

  # All properties are schemas
  if parent_schema.schema["properties"]
    parent_schema.schema["properties"].each do |k,v|
      handle_schema(parent_schema, v)
    end
  end
  if parent_schema.schema["patternProperties"]
    parent_schema.schema["patternProperties"].each do |k,v|
      handle_schema(parent_schema, v)
    end
  end

  # Items are always schemas
  if parent_schema.schema["items"]
    items = parent_schema.schema["items"].clone
    single = false
    if !items.is_a?(Array)
      items = [items]
      single = true
    end
    items.each_with_index do |item,i|
      handle_schema(parent_schema, item)
    end
  end

  # Each of these might be schemas
  ["additionalProperties", "additionalItems", "dependencies", "extends"].each do |key|
    if parent_schema.schema[key].is_a?(Hash)
      handle_schema(parent_schema, parent_schema.schema[key])
    end
  end

end

#handle_schema(parent_schema, obj) ⇒ Object

Either load a reference schema or create a new schema



333
334
335
336
337
338
339
340
341
342
 
# File 'lib/json-schema/validator.rb', line 333

def handle_schema(parent_schema, obj)
  if obj.is_a?(Hash)
    schema_uri = parent_schema.uri.clone
    schema = JSON::Schema.new(obj,schema_uri,parent_schema.validator)
    if obj['id']
      Validator.add_schema(schema)
    end
    build_schemas(schema)
  end
end

#load_ref_schema(parent_schema, ref) ⇒ Object 



227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
 
# File 'lib/json-schema/validator.rb', line 227

def load_ref_schema(parent_schema,ref)
  uri = URI.parse(ref)
  if uri.relative?
    uri = parent_schema.uri.clone

    # Check for absolute path
    path = ref.split("#")[0]

    # This is a self reference and thus the schema does not need to be re-loaded
    if path.nil? || path == ''
      return
    end

    if path && path[0,1] == '/'
      uri.path = Pathname.new(path).cleanpath.to_s
    else
      uri = parent_schema.uri.merge(path)
    end
    uri.fragment = ''
  end

  if Validator.schemas[uri.to_s].nil?
    begin
      schema = JSON::Schema.new(JSON::Validator.parse(open(uri.to_s).read), uri, @options[:version])
      Validator.add_schema(schema)
      build_schemas(schema)
    rescue JSON::ParserError
      # Don't rescue this error, we want JSON formatting issues to bubble up
      raise $!
    rescue Exception
      # Failures will occur when this URI cannot be referenced yet. Don't worry about it,
      # the proper error will fall out if the ref isn't ever defined
    end
  end
end

#schema_from_fragment(base_schema, fragment) ⇒ Object 



183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
 
# File 'lib/json-schema/validator.rb', line 183

def schema_from_fragment(base_schema, fragment)
  fragments = fragment.split("/")

  # ensure the first element was a hash, per the fragment spec
  if fragments.shift != "#"
    raise JSON::Schema::SchemaError.new("Invalid fragment syntax in :fragment option")
  end

  fragments.each do |f|
    if base_schema.is_a?(Hash)
      if !base_schema.has_key?(f)
        raise JSON::Schema::SchemaError.new("Invalid fragment resolution for :fragment option")
      end
      base_schema = base_schema[f]
    elsif base_schema.is_a?(Array)
      if base_schema[f.to_i].nil?
        raise JSON::Schema::SchemaError.new("Invalid fragment resolution for :fragment option")
      end
      base_schema = base_schema[f.to_i]
    else
      raise JSON::Schema::SchemaError.new("Invalid schema encountered when resolving :fragment option")
    end
  end

  base_schema
end

#validate ⇒ Object

Run a simple true/false validation of data against a schema



211
212
213
214
215
216
217
218
219
220
221
222
223
224
 
# File 'lib/json-schema/validator.rb', line 211

def validate()
  begin
    @base_schema.validate(@data,[],self,@validation_options)
    Validator.clear_cache
    if @options[:errors_as_objects]
      return @errors.map{|e| e.to_hash}
    else
      return @errors.map{|e| e.to_string}
    end
  rescue JSON::Schema::ValidationError
    Validator.clear_cache
    raise $!
  end
end

#validation_error(error) ⇒ Object 



344
345
346
 
# File 'lib/json-schema/validator.rb', line 344

def validation_error(error)
  @errors.push(error)
end

#validation_errors ⇒ Object 



348
349
350
 
# File 'lib/json-schema/validator.rb', line 348

def validation_errors
  @errors
end