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| 1 | +defmodule Mint.Core.Headers do |
| 2 | + @moduledoc false |
| 3 | + |
| 4 | + @type canonical() :: |
| 5 | + {original_name :: String.t(), canonical_name :: String.t(), value :: String.t()} |
| 6 | + @type raw() :: {original_name :: String.t(), value :: String.t()} |
| 7 | + |
| 8 | + @unallowed_trailers MapSet.new([ |
| 9 | + "content-encoding", |
| 10 | + "content-length", |
| 11 | + "content-range", |
| 12 | + "content-type", |
| 13 | + "trailer", |
| 14 | + "transfer-encoding", |
| 15 | + |
| 16 | + # Control headers (https://svn.tools.ietf.org/svn/wg/httpbis/specs/rfc7231.html#rfc.section.5.1) |
| 17 | + "cache-control", |
| 18 | + "expect", |
| 19 | + "host", |
| 20 | + "max-forwards", |
| 21 | + "pragma", |
| 22 | + "range", |
| 23 | + "te", |
| 24 | + |
| 25 | + # Conditionals (https://svn.tools.ietf.org/svn/wg/httpbis/specs/rfc7231.html#rfc.section.5.2) |
| 26 | + "if-match", |
| 27 | + "if-none-match", |
| 28 | + "if-modified-since", |
| 29 | + "if-unmodified-since", |
| 30 | + "if-range", |
| 31 | + |
| 32 | + # Authentication/authorization (https://tools.ietf.org/html/rfc7235#section-5.3) |
| 33 | + "authorization", |
| 34 | + "proxy-authenticate", |
| 35 | + "proxy-authorization", |
| 36 | + "www-authenticate", |
| 37 | + |
| 38 | + # Cookie management (https://tools.ietf.org/html/rfc6265) |
| 39 | + "cookie", |
| 40 | + "set-cookie", |
| 41 | + |
| 42 | + # Control data (https://svn.tools.ietf.org/svn/wg/httpbis/specs/rfc7231.html#rfc.section.7.1) |
| 43 | + "age", |
| 44 | + "cache-control", |
| 45 | + "expires", |
| 46 | + "date", |
| 47 | + "location", |
| 48 | + "retry-after", |
| 49 | + "vary", |
| 50 | + "warning" |
| 51 | + ]) |
| 52 | + |
| 53 | + @spec from_raw([raw()]) :: [canonical()] |
| 54 | + def from_raw(headers) do |
| 55 | + Enum.map(headers, fn {name, value} -> {name, lower_raw(name), value} end) |
| 56 | + end |
| 57 | + |
| 58 | + @spec to_raw([canonical()], boolean()) :: [raw()] |
| 59 | + def to_raw(headers, _case_sensitive = true) do |
| 60 | + Enum.map(headers, fn {name, _canonical_name, value} -> {name, value} end) |
| 61 | + end |
| 62 | + |
| 63 | + def to_raw(headers, _case_sensitive = false) do |
| 64 | + Enum.map(headers, fn {_name, canonical_name, value} -> |
| 65 | + {canonical_name, value} |
| 66 | + end) |
| 67 | + end |
| 68 | + |
| 69 | + @spec find([canonical()], String.t()) :: {String.t(), String.t()} | nil |
| 70 | + def find(headers, name) do |
| 71 | + case List.keyfind(headers, name, 1) do |
| 72 | + nil -> nil |
| 73 | + {name, _canonical_name, value} -> {name, value} |
| 74 | + end |
| 75 | + end |
| 76 | + |
| 77 | + @spec replace([canonical()], String.t(), String.t(), String.t()) :: |
| 78 | + [canonical()] |
| 79 | + def replace(headers, new_name, canonical_name, value) do |
| 80 | + List.keyreplace(headers, canonical_name, 1, {new_name, canonical_name, value}) |
| 81 | + end |
| 82 | + |
| 83 | + @spec has?([canonical()], String.t()) :: boolean() |
| 84 | + def has?(headers, name) do |
| 85 | + List.keymember?(headers, name, 1) |
| 86 | + end |
| 87 | + |
| 88 | + @spec put_new([canonical()], String.t(), String.t(), String.t() | nil) :: |
| 89 | + [canonical()] |
| 90 | + def put_new(headers, _name, _canonical_name, nil) do |
| 91 | + headers |
| 92 | + end |
| 93 | + |
| 94 | + def put_new(headers, name, canonical_name, value) do |
| 95 | + if List.keymember?(headers, canonical_name, 1) do |
| 96 | + headers |
| 97 | + else |
| 98 | + [{name, canonical_name, value} | headers] |
| 99 | + end |
| 100 | + end |
| 101 | + |
| 102 | + @spec put_new([canonical()], String.t(), String.t(), (-> String.t())) :: |
| 103 | + [canonical()] |
| 104 | + def put_new_lazy(headers, name, canonical_name, fun) do |
| 105 | + if List.keymember?(headers, canonical_name, 1) do |
| 106 | + headers |
| 107 | + else |
| 108 | + [{name, canonical_name, fun.()} | headers] |
| 109 | + end |
| 110 | + end |
| 111 | + |
| 112 | + @spec find_unallowed_trailer([canonical()]) :: String.t() | nil |
| 113 | + def find_unallowed_trailer(headers) do |
| 114 | + Enum.find_value(headers, fn |
| 115 | + {raw_name, canonical_name, _value} -> |
| 116 | + if canonical_name in @unallowed_trailers do |
| 117 | + raw_name |
| 118 | + end |
| 119 | + end) |
| 120 | + end |
| 121 | + |
| 122 | + @spec remove_unallowed_trailer([raw()]) :: [raw()] |
| 123 | + def remove_unallowed_trailer(headers) do |
| 124 | + Enum.reject(headers, fn {name, _value} -> name in @unallowed_trailers end) |
| 125 | + end |
| 126 | + |
| 127 | + @spec lower_raw(String.t()) :: String.t() |
| 128 | + def lower_raw(name) do |
| 129 | + String.downcase(name, :ascii) |
| 130 | + end |
| 131 | + |
| 132 | + @spec lower_raws([raw()]) :: [raw()] |
| 133 | + def lower_raws(headers) do |
| 134 | + Enum.map(headers, fn {name, value} -> {lower_raw(name), value} end) |
| 135 | + end |
| 136 | +end |
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