Class: Rack::Lint
Overview
Rack::Lint validates your application and the requests and responses according to the Rack spec.
Defined Under Namespace
Modules: Assertion
Classes: ErrorWrapper, InputWrapper, LintError
Instance Method Summary
collapse
Methods included from Assertion
#assert
Constructor Details
#initialize(app) ⇒ Lint
Returns a new instance of Lint.
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# File 'lib/gems/rack-0.9.1/lib/rack/lint.rb', line 6
def initialize(app)
@app = app
end
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Instance Method Details
#_call(env) ⇒ Object
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# File 'lib/gems/rack-0.9.1/lib/rack/lint.rb', line 36
def _call(env)
assert("No env given") { env }
check_env env
env['rack.input'] = InputWrapper.new(env['rack.input'])
env['rack.errors'] = ErrorWrapper.new(env['rack.errors'])
status, , @body = @app.call(env)
check_status status
check_content_type status,
check_content_length status, , env
[status, , self]
end
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#call(env = nil) ⇒ Object
A Rack application is an Ruby object (not a class) that responds to call
.
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# File 'lib/gems/rack-0.9.1/lib/rack/lint.rb', line 32
def call(env=nil)
dup._call(env)
end
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#check_content_length(status, headers, env) ⇒ Object
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# File 'lib/gems/rack-0.9.1/lib/rack/lint.rb', line 375
def check_content_length(status, , env)
chunked_response = false
.each { |key, value|
if key.downcase == 'transfer-encoding'
chunked_response = value.downcase != 'identity'
end
}
.each { |key, value|
if key.downcase == 'content-length'
assert("Content-Length header found in #{status} response, not allowed") {
not Rack::Utils::STATUS_WITH_NO_ENTITY_BODY.include? status.to_i
}
assert('Content-Length header should not be used if body is chunked') {
not chunked_response
}
bytes = 0
string_body = true
@body.each { |part|
unless part.kind_of?(String)
string_body = false
break
end
bytes += (part.respond_to?(:bytesize) ? part.bytesize : part.size)
}
if env["REQUEST_METHOD"] == "HEAD"
assert("Response body was given for HEAD request, but should be empty") {
bytes == 0
}
else
if string_body
assert("Content-Length header was #{value}, but should be #{bytes}") {
value == bytes.to_s
}
end
end
return
end
}
if [ String, Array ].include?(@body.class) && !chunked_response
assert('No Content-Length header found') {
Rack::Utils::STATUS_WITH_NO_ENTITY_BODY.include? status.to_i
}
end
end
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#check_content_type(status, headers) ⇒ Object
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# File 'lib/gems/rack-0.9.1/lib/rack/lint.rb', line 357
def check_content_type(status, )
.each { |key, value|
if key.downcase == "content-type"
assert("Content-Type header found in #{status} response, not allowed") {
not Rack::Utils::STATUS_WITH_NO_ENTITY_BODY.include? status.to_i
}
return
end
}
assert("No Content-Type header found") {
Rack::Utils::STATUS_WITH_NO_ENTITY_BODY.include? status.to_i
}
end
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#check_env(env) ⇒ Object
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# File 'lib/gems/rack-0.9.1/lib/rack/lint.rb', line 57
def check_env(env)
assert("env #{env.inspect} is not a Hash, but #{env.class}") {
env.instance_of? Hash
}
%w[REQUEST_METHOD SERVER_NAME SERVER_PORT
QUERY_STRING
rack.version rack.input rack.errors
rack.multithread rack.multiprocess rack.run_once].each { ||
assert("env missing required key #{}") { env.include? }
}
%w[HTTP_CONTENT_TYPE HTTP_CONTENT_LENGTH].each { ||
assert("env contains #{}, must use #{[5,-1]}") {
not env.include?
}
}
env.each { |key, value|
next if key.include? "." assert("env variable #{key} has non-string value #{value.inspect}") {
value.instance_of? String
}
}
assert("rack.version must be an Array, was #{env["rack.version"].class}") {
env["rack.version"].instance_of? Array
}
assert("rack.url_scheme unknown: #{env["rack.url_scheme"].inspect}") {
%w[http https].include? env["rack.url_scheme"]
}
check_input env["rack.input"]
check_error env["rack.errors"]
assert("REQUEST_METHOD unknown: #{env["REQUEST_METHOD"]}") {
env["REQUEST_METHOD"] =~ /\A[0-9A-Za-z!\#$%&'*+.^_`|~-]+\z/
}
assert("SCRIPT_NAME must start with /") {
!env.include?("SCRIPT_NAME") ||
env["SCRIPT_NAME"] == "" ||
env["SCRIPT_NAME"] =~ /\A\//
}
assert("PATH_INFO must start with /") {
!env.include?("PATH_INFO") ||
env["PATH_INFO"] == "" ||
env["PATH_INFO"] =~ /\A\//
}
assert("Invalid CONTENT_LENGTH: #{env["CONTENT_LENGTH"]}") {
!env.include?("CONTENT_LENGTH") || env["CONTENT_LENGTH"] =~ /\A\d+\z/
}
assert("One of SCRIPT_NAME or PATH_INFO must be set (make PATH_INFO '/' if SCRIPT_NAME is empty)") {
env["SCRIPT_NAME"] || env["PATH_INFO"]
}
assert("SCRIPT_NAME cannot be '/', make it '' and PATH_INFO '/'") {
env["SCRIPT_NAME"] != "/"
}
end
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#check_error(error) ⇒ Object
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# File 'lib/gems/rack-0.9.1/lib/rack/lint.rb', line 272
def check_error(error)
[:puts, :write, :flush].each { |method|
assert("rack.error #{error} does not respond to ##{method}") {
error.respond_to? method
}
}
end
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# File 'lib/gems/rack-0.9.1/lib/rack/lint.rb', line 320
def ()
assert("headers object should respond to #each, but doesn't (got #{.class} as headers)") {
.respond_to? :each
}
.each { |key, value|
assert("header key must be a string, was #{key.class}") {
key.instance_of? String
}
assert("header must not contain Status") { key.downcase != "status" }
assert("header names must not contain : or \\n") { key !~ /[:\n]/ }
assert("header names must not end in - or _") { key !~ /[-_]\z/ }
assert("invalid header name: #{key}") { key =~ /\A[a-zA-Z][a-zA-Z0-9_-]*\z/ }
assert("header values must respond to #each, but the value of " +
"'#{key}' doesn't (is #{value.class})") { value.respond_to? :each }
value.each { |item|
assert("header values must consist of Strings, but '#{key}' also contains a #{item.class}") {
item.instance_of?(String)
}
assert("invalid header value #{key}: #{item.inspect}") {
item !~ /[\000-\037]/
}
}
}
end
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# File 'lib/gems/rack-0.9.1/lib/rack/lint.rb', line 201
def check_input(input)
[:gets, :each, :read].each { |method|
assert("rack.input #{input} does not respond to ##{method}") {
input.respond_to? method
}
}
end
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#check_status(status) ⇒ Object
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# File 'lib/gems/rack-0.9.1/lib/rack/lint.rb', line 314
def check_status(status)
assert("Status must be >=100 seen as integer") { status.to_i >= 100 }
end
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# File 'lib/gems/rack-0.9.1/lib/rack/lint.rb', line 451
def close
@closed = true
@body.close if @body.respond_to?(:close)
end
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# File 'lib/gems/rack-0.9.1/lib/rack/lint.rb', line 432
def each
@closed = false
@body.each { |part|
assert("Body yielded non-string value #{part.inspect}") {
part.instance_of? String
}
yield part
}
end
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