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annotate pkg/models/common.go @ 5377:d19fdf3d2099 extented-report

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Add a string type that allows only runes that are safe of directory traversal.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 24 Jun 2021 22:13:48 +0200
parents 4847ac70103a
children 1222b777f51f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2018 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
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14 package models
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15
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16 import (
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17 "database/sql/driver"
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18 "encoding/json"
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19 "errors"
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20 "fmt"
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21 "regexp"
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22 "strings"
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23 "time"
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24
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25 "gemma.intevation.de/gemma/pkg/common"
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26 )
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27
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28 var (
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29 errNoString = errors.New("not a string")
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30 errNoByteSlice = errors.New("not a byte slice")
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31 )
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32
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33 // WGS84 is the EPSG of the World Geodetic System 1984.
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34 const WGS84 = 4326
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35
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36 type (
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37 Date struct{ time.Time }
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38 Time struct{ time.Time }
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39
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40 // Country is a valid country 2 letter code.
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41 Country string
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42 // UniqueCountries is a list of unique countries.
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43 UniqueCountries []Country
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44
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45 // SafePath should only contain chars that directory traversal safe.
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46 SafePath string
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47 )
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48
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49 func (d Date) MarshalJSON() ([]byte, error) {
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50 return json.Marshal(d.Format(common.DateFormat))
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51 }
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52
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53 func (d *Date) UnmarshalJSON(data []byte) error {
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54 var s string
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55 if err := json.Unmarshal(data, &s); err != nil {
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56 return err
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57 }
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58 d2, err := time.Parse(common.DateFormat, s)
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59 if err == nil {
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60 *d = Date{d2}
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61 }
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62 return err
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63 }
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64
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65 func (t Time) MarshalJSON() ([]byte, error) {
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66 return json.Marshal(t.Format(common.TimeFormat))
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67 }
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68
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69 func (t *Time) UnmarshalJSON(data []byte) error {
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70 var s string
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71 if err := json.Unmarshal(data, &s); err != nil {
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72 return err
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73 }
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74 t2, err := time.Parse(common.TimeFormat, s)
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75 if err == nil {
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76 *t = Time{t2}
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77 }
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78 return err
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79 }
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80
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81 var (
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82 validCountries = []string{
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83 "AT", "BG", "DE", "HU", "HR",
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84 "MD", "RO", "RS", "SK", "UA",
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85 }
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86 )
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87
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88 // Valid checks if the given country is a known one.
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89 func (c Country) Valid() bool {
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90 for _, v := range validCountries {
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91 if string(c) == v {
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92 return true
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93 }
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94 }
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95 return false
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96 }
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97
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98 // UnmarshalJSON ensures that the given string forms a valid
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99 // two letter country code.
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100 func (c *Country) UnmarshalJSON(data []byte) error {
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101 var s string
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102 if err := json.Unmarshal(data, &s); err != nil {
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103 return err
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104 }
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105 u := strings.ToUpper(s)
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106 for _, v := range validCountries {
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107 if v == u {
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108 *c = Country(v)
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109 return nil
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110 }
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111 }
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112 return fmt.Errorf("'%s' is not a valid country", s)
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113 }
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114
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115 // Value implements the driver.Valuer interface.
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116 func (c Country) Value() (driver.Value, error) {
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117 return string(c), nil
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118 }
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119
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120 // Scan implements the sql.Scanner interfaces.
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121 func (c *Country) Scan(src interface{}) (err error) {
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122 if s, ok := src.(string); ok {
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123 *c = Country(s)
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124 } else {
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125 err = errNoString
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126 }
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127 return
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128 }
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129
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130 func (uc *UniqueCountries) UnmarshalJSON(data []byte) error {
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131 var countries []Country
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132 if err := json.Unmarshal(data, &countries); err != nil {
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133 return err
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134 }
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135 unique := map[Country]struct{}{}
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136 for _, c := range countries {
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137 if _, found := unique[c]; found {
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138 return fmt.Errorf("country '%s' is not unique", string(c))
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139 }
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140 unique[c] = struct{}{}
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141 }
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142 *uc = countries
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143 return nil
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144 }
2231
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145
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146 func (uc UniqueCountries) String() string {
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147 var b strings.Builder
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148 for i, c := range uc {
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149 if i > 0 {
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150 b.WriteString(", ")
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151 }
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152 b.WriteString(string(c))
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153 }
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154 return b.String()
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155 }
5377
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156
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157 const SafePathExp = "[a-zA-Z0-9_-]+"
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158
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159 var safePathRegExp = regexp.MustCompile("^" + SafePathExp + "$")
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160
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161 func (sp SafePath) Valid() bool {
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162 return safePathRegExp.MatchString(string(sp))
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163 }
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164
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165 // UnmarshalJSON ensures that the given string only consist
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166 // of runes that are directory traversal safe.
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167 func (sp *SafePath) UnmarshalJSON(data []byte) error {
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168 var s string
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169 if err := json.Unmarshal(data, &s); err != nil {
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170 return err
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171 }
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172 if c := SafePath(s); c.Valid() {
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173 *sp = c
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174 return nil
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175 }
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176 return fmt.Errorf("'%s' is not a safe path", s)
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177 }