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require "json"
require "yaml"
require_relative "../json_schema"
module Commands
class ValidateSchema
attr_accessor :detect
attr_accessor :fail_fast
attr_accessor :extra_schemas
attr_accessor :errors
attr_accessor :messages
def initialize
@detect = false
@fail_fast = false
@extra_schemas = []
@errors = []
@messages = []
end
def run(argv)
return false if !initialize_store
if !detect
return false if !(schema_file = argv.shift)
return false if !(schema = parse(schema_file))
end
# if there are no remaining files in arguments, also a problem
return false if argv.count < 1
argv.each do |data_file|
if !(data = read_file(data_file))
return false
end
if detect
if !(schema_uri = data["$schema"])
@errors = ["#{data_file}: No $schema tag for detection."]
return false
end
if !(schema = @store.lookup_schema(schema_uri))
@errors = ["#{data_file}: Unknown $schema, try specifying one with -s."]
return false
end
end
valid, errors = schema.validate(data, fail_fast: fail_fast)
if valid
@messages += ["#{data_file} is valid."]
else
@errors = map_schema_errors(data_file, errors)
end
end
@errors.empty?
end
private
def initialize_store
@store = JsonSchema::DocumentStore.new
extra_schemas.each do |extra_schema|
if !(extra_schema = parse(extra_schema))
return false
end
@store.add_schema(extra_schema)
end
true
end
# Builds a JSON Reference + message like "/path/to/file#/path/to/data".
def map_schema_errors(file, errors)
errors.map { |m| "#{file}#{m}" }
end
def parse(file)
if !(schema_data = read_file(file))
return nil
end
parser = JsonSchema::Parser.new
if !(schema = parser.parse(schema_data))
@errors = map_schema_errors(file, parser.errors)
return nil
end
expander = JsonSchema::ReferenceExpander.new
if !expander.expand(schema, store: @store)
@errors = map_schema_errors(file, expander.errors)
return nil
end
schema
end
def read_file(file)
contents = File.read(file)
# Perform an empty check because boath YAML and JSON's load will return
# `nil` in the case of an empty file, which will otherwise produce
# confusing results.
if contents.empty?
@errors = ["#{file}: File is empty."]
nil
else
if File.extname(file) == ".yaml"
YAML.load(contents)
else
JSON.load(contents)
end
end
rescue Errno::ENOENT
@errors = ["#{file}: No such file or directory."]
nil
rescue JSON::ParserError
# Ruby's parsing exceptions aren't too helpful, just point user to
# a better tool
@errors = ["#{file}: Invalid JSON. Try to validate using `jsonlint`."]
nil
rescue Psych::SyntaxError
@errors = ["#{file}: Invalid YAML."]
nil
end
end
end
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