1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
require 'zlib'
require 'active_support/core_ext/file'
require 'action_controller/metal/exceptions'
module ActionView
class AssetPaths #:nodoc:
attr_reader :config, :controller
def initialize(config, controller = nil)
@config = config
@controller = controller
end
# Add the extension +ext+ if not present. Return full or scheme-relative URLs otherwise untouched.
# Prefix with <tt>/dir/</tt> if lacking a leading +/+. Account for relative URL
# roots. Rewrite the asset path for cache-busting asset ids. Include
# asset host, if configured, with the correct request protocol.
#
# When include_host is true and the asset host does not specify the protocol
# the protocol parameter specifies how the protocol will be added.
# When :relative (default), the protocol will be determined by the client using current protocol
# When :request, the protocol will be the request protocol
# Otherwise, the protocol is used (E.g. :http, :https, etc)
def compute_public_path(source, dir, ext = nil, include_host = true, protocol = nil)
source = source.to_s
return source if is_uri?(source)
source = rewrite_extension(source, dir, ext) if ext
source = rewrite_asset_path(source, dir)
source = rewrite_relative_url_root(source, relative_url_root)
source = rewrite_host_and_protocol(source, protocol) if include_host
source
end
# Return the filesystem path for the source
def compute_source_path(source, dir, ext)
source = rewrite_extension(source, dir, ext) if ext
File.join(config.assets_dir, dir, source)
end
def is_uri?(path)
path =~ %r{^[-a-z]+://|^cid:|^//}
end
private
def rewrite_extension(source, dir, ext)
raise NotImplementedError
end
def rewrite_asset_path(source, path = nil)
raise NotImplementedError
end
def rewrite_relative_url_root(source, relative_url_root)
relative_url_root && !source.starts_with?("#{relative_url_root}/") ? "#{relative_url_root}#{source}" : source
end
def has_request?
controller.respond_to?(:request)
end
def rewrite_host_and_protocol(source, protocol = nil)
host = compute_asset_host(source)
if host && !is_uri?(host)
if (protocol || default_protocol) == :request && !has_request?
host = nil
else
host = "#{compute_protocol(protocol)}#{host}"
end
end
host ? "#{host}#{source}" : source
end
def compute_protocol(protocol)
protocol ||= default_protocol
case protocol
when :relative
"//"
when :request
unless @controller
invalid_asset_host!("The protocol requested was :request. Consider using :relative instead.")
end
@controller.request.protocol
else
"#{protocol}://"
end
end
def default_protocol
protocol = @config.action_controller.default_asset_host_protocol if @config.action_controller.present?
protocol ||= @config.default_asset_host_protocol
protocol || (has_request? ? :request : :relative)
end
def invalid_asset_host!(help_message)
raise ActionController::RoutingError, "This asset host cannot be computed without a request in scope. #{help_message}"
end
# Pick an asset host for this source. Returns +nil+ if no host is set,
# the host if no wildcard is set, the host interpolated with the
# numbers 0-3 if it contains <tt>%d</tt> (the number is the source hash mod 4),
# or the value returned from invoking call on an object responding to call
# (proc or otherwise).
def compute_asset_host(source)
if host = asset_host_config
if host.respond_to?(:call)
args = [source]
arity = arity_of(host)
if arity > 1 && !has_request?
invalid_asset_host!("Remove the second argument to your asset_host Proc if you do not need the request.")
end
args << current_request if (arity > 1 || arity < 0) && has_request?
host.call(*args)
else
(host =~ /%d/) ? host % (Zlib.crc32(source) % 4) : host
end
end
end
def relative_url_root
config = controller.config if controller.respond_to?(:config)
config ||= config.action_controller if config.action_controller.present?
config.relative_url_root
end
def asset_host_config
if config.action_controller.present?
config.action_controller.asset_host
else
config.asset_host
end
end
# Returns the current request if one exists.
def current_request
controller.request if has_request?
end
# Returns the arity of a callable
def arity_of(callable)
callable.respond_to?(:arity) ? callable.arity : callable.method(:call).arity
end
end
end
|
