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
 
# 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]

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

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

Class Method Details

.add_schema(schema) ⇒ Object 



381
382
383
 
# File 'lib/json-schema/validator.rb', line 381

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

.cache_schemas=(val) ⇒ Object 



385
386
387
 
# File 'lib/json-schema/validator.rb', line 385

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

.clear_cache ⇒ Object 



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

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

.default_validator ⇒ Object 



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

def default_validator
  @@default_validator
end

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



353
354
355
356
357
 
# File 'lib/json-schema/validator.rb', line 353

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 



365
366
367
 
# File 'lib/json-schema/validator.rb', line 365

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

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



359
360
361
362
363
 
# File 'lib/json-schema/validator.rb', line 359

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 



369
370
371
 
# File 'lib/json-schema/validator.rb', line 369

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

.json_backend ⇒ Object 



405
406
407
408
409
410
411
 
# File 'lib/json-schema/validator.rb', line 405

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

.json_backend=(backend) ⇒ Object 



413
414
415
416
417
418
419
420
421
422
423
424
425
 
# File 'lib/json-schema/validator.rb', line 413

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 



427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
 
# File 'lib/json-schema/validator.rb', line 427

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 



401
402
403
 
# File 'lib/json-schema/validator.rb', line 401

def register_default_validator(v)
  @@default_validator = v
end

.register_validator(v) ⇒ Object 



397
398
399
 
# File 'lib/json-schema/validator.rb', line 397

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

.schemas ⇒ Object 



377
378
379
 
# File 'lib/json-schema/validator.rb', line 377

def schemas
  @@schemas
end

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



320
321
322
323
324
325
326
327
328
 
# File 'lib/json-schema/validator.rb', line 320

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 



338
339
340
341
342
 
# File 'lib/json-schema/validator.rb', line 338

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

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



330
331
332
 
# File 'lib/json-schema/validator.rb', line 330

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

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



345
346
347
 
# File 'lib/json-schema/validator.rb', line 345

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

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



334
335
336
 
# File 'lib/json-schema/validator.rb', line 334

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

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



349
350
351
 
# File 'lib/json-schema/validator.rb', line 349

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

.validators ⇒ Object 



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

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"
    "draft-04"
  when "draft3"
    "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



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
262
263
264
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
 
# File 'lib/json-schema/validator.rb', line 231

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



299
300
301
302
303
304
305
306
307
308
 
# File 'lib/json-schema/validator.rb', line 299

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 



193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
 
# File 'lib/json-schema/validator.rb', line 193

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

#validate ⇒ Object

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



177
178
179
180
181
182
183
184
185
186
187
188
189
190
 
# File 'lib/json-schema/validator.rb', line 177

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 



310
311
312
 
# File 'lib/json-schema/validator.rb', line 310

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

#validation_errors ⇒ Object 



314
315
316
 
# File 'lib/json-schema/validator.rb', line 314

def validation_errors
  @errors
end