ducky/devices

Paddy 2015-12-19 Parent:c24a6c5fcd8c

17:ad63b888f899 Go to Latest

ducky/devices/vendor/bitbucket.org/ww/goautoneg/autoneg.go

Fix JSON pointers in errors when creating devices. Our JSON pointers used to point at the root of the document, but the properties were actually in objects in an array keyed off of "devices", so we had to update the field property of our errors to match. While we were in there, we fixed the "insufficient" error for a Device's name to be "missing" when the name is an empty string. So far, the only way for a Device's name for it to be insufficient is _for it to be the empty string_, but if in the future we raise the minimum length of the Device name, there will be a distinction and I'd like the code to recognise it.

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paddy@15 1 /*
paddy@15 2 HTTP Content-Type Autonegotiation.
paddy@15 3
paddy@15 4 The functions in this package implement the behaviour specified in
paddy@15 5 http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
paddy@15 6
paddy@15 7 Copyright (c) 2011, Open Knowledge Foundation Ltd.
paddy@15 8 All rights reserved.
paddy@15 9
paddy@15 10 Redistribution and use in source and binary forms, with or without
paddy@15 11 modification, are permitted provided that the following conditions are
paddy@15 12 met:
paddy@15 13
paddy@15 14 Redistributions of source code must retain the above copyright
paddy@15 15 notice, this list of conditions and the following disclaimer.
paddy@15 16
paddy@15 17 Redistributions in binary form must reproduce the above copyright
paddy@15 18 notice, this list of conditions and the following disclaimer in
paddy@15 19 the documentation and/or other materials provided with the
paddy@15 20 distribution.
paddy@15 21
paddy@15 22 Neither the name of the Open Knowledge Foundation Ltd. nor the
paddy@15 23 names of its contributors may be used to endorse or promote
paddy@15 24 products derived from this software without specific prior written
paddy@15 25 permission.
paddy@15 26
paddy@15 27 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
paddy@15 28 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
paddy@15 29 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
paddy@15 30 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
paddy@15 31 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
paddy@15 32 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
paddy@15 33 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
paddy@15 34 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
paddy@15 35 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
paddy@15 36 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
paddy@15 37 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
paddy@15 38
paddy@15 39
paddy@15 40 */
paddy@15 41 package goautoneg
paddy@15 42
paddy@15 43 import (
paddy@15 44 "sort"
paddy@15 45 "strconv"
paddy@15 46 "strings"
paddy@15 47 )
paddy@15 48
paddy@15 49 // Structure to represent a clause in an HTTP Accept Header
paddy@15 50 type Accept struct {
paddy@15 51 Type, SubType string
paddy@15 52 Q float64
paddy@15 53 Params map[string]string
paddy@15 54 }
paddy@15 55
paddy@15 56 // For internal use, so that we can use the sort interface
paddy@15 57 type accept_slice []Accept
paddy@15 58
paddy@15 59 func (accept accept_slice) Len() int {
paddy@15 60 slice := []Accept(accept)
paddy@15 61 return len(slice)
paddy@15 62 }
paddy@15 63
paddy@15 64 func (accept accept_slice) Less(i, j int) bool {
paddy@15 65 slice := []Accept(accept)
paddy@15 66 ai, aj := slice[i], slice[j]
paddy@15 67 if ai.Q > aj.Q {
paddy@15 68 return true
paddy@15 69 }
paddy@15 70 if ai.Type != "*" && aj.Type == "*" {
paddy@15 71 return true
paddy@15 72 }
paddy@15 73 if ai.SubType != "*" && aj.SubType == "*" {
paddy@15 74 return true
paddy@15 75 }
paddy@15 76 return false
paddy@15 77 }
paddy@15 78
paddy@15 79 func (accept accept_slice) Swap(i, j int) {
paddy@15 80 slice := []Accept(accept)
paddy@15 81 slice[i], slice[j] = slice[j], slice[i]
paddy@15 82 }
paddy@15 83
paddy@15 84 // Parse an Accept Header string returning a sorted list
paddy@15 85 // of clauses
paddy@15 86 func ParseAccept(header string) (accept []Accept) {
paddy@15 87 parts := strings.Split(header, ",")
paddy@15 88 accept = make([]Accept, 0, len(parts))
paddy@15 89 for _, part := range parts {
paddy@15 90 part := strings.Trim(part, " ")
paddy@15 91
paddy@15 92 a := Accept{}
paddy@15 93 a.Params = make(map[string]string)
paddy@15 94 a.Q = 1.0
paddy@15 95
paddy@15 96 mrp := strings.Split(part, ";")
paddy@15 97
paddy@15 98 media_range := mrp[0]
paddy@15 99 sp := strings.Split(media_range, "/")
paddy@15 100 a.Type = strings.Trim(sp[0], " ")
paddy@15 101
paddy@15 102 switch {
paddy@15 103 case len(sp) == 1 && a.Type == "*":
paddy@15 104 a.SubType = "*"
paddy@15 105 case len(sp) == 2:
paddy@15 106 a.SubType = strings.Trim(sp[1], " ")
paddy@15 107 default:
paddy@15 108 continue
paddy@15 109 }
paddy@15 110
paddy@15 111 if len(mrp) == 1 {
paddy@15 112 accept = append(accept, a)
paddy@15 113 continue
paddy@15 114 }
paddy@15 115
paddy@15 116 for _, param := range mrp[1:] {
paddy@15 117 sp := strings.SplitN(param, "=", 2)
paddy@15 118 if len(sp) != 2 {
paddy@15 119 continue
paddy@15 120 }
paddy@15 121 token := strings.Trim(sp[0], " ")
paddy@15 122 if token == "q" {
paddy@15 123 a.Q, _ = strconv.ParseFloat(sp[1], 32)
paddy@15 124 } else {
paddy@15 125 a.Params[token] = strings.Trim(sp[1], " ")
paddy@15 126 }
paddy@15 127 }
paddy@15 128
paddy@15 129 accept = append(accept, a)
paddy@15 130 }
paddy@15 131
paddy@15 132 slice := accept_slice(accept)
paddy@15 133 sort.Sort(slice)
paddy@15 134
paddy@15 135 return
paddy@15 136 }
paddy@15 137
paddy@15 138 // Negotiate the most appropriate content_type given the accept header
paddy@15 139 // and a list of alternatives.
paddy@15 140 func Negotiate(header string, alternatives []string) (content_type string) {
paddy@15 141 asp := make([][]string, 0, len(alternatives))
paddy@15 142 for _, ctype := range alternatives {
paddy@15 143 asp = append(asp, strings.SplitN(ctype, "/", 2))
paddy@15 144 }
paddy@15 145 for _, clause := range ParseAccept(header) {
paddy@15 146 for i, ctsp := range asp {
paddy@15 147 if clause.Type == ctsp[0] && clause.SubType == ctsp[1] {
paddy@15 148 content_type = alternatives[i]
paddy@15 149 return
paddy@15 150 }
paddy@15 151 if clause.Type == ctsp[0] && clause.SubType == "*" {
paddy@15 152 content_type = alternatives[i]
paddy@15 153 return
paddy@15 154 }
paddy@15 155 if clause.Type == "*" && clause.SubType == "*" {
paddy@15 156 content_type = alternatives[i]
paddy@15 157 return
paddy@15 158 }
paddy@15 159 }
paddy@15 160 }
paddy@15 161 return
paddy@15 162 }