Mercurial > gemma
annotate pkg/controllers/json.go @ 2327:ead321473840
schema/gemma.sql: Added to gm_waterlevel bottlenecks_geoserver view.
author | Bjoern Schilberg <bjoern@intevation.de> |
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date | Tue, 19 Feb 2019 13:45:39 +0100 |
parents | 09f9ae3d0526 |
children | 1458c9b0fdaa |
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 controllers |
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15 |
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16 import ( |
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17 "database/sql" |
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18 "encoding/json" |
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19 "fmt" |
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20 "io" |
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21 "log" |
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22 "net/http" |
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23 |
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24 "github.com/jackc/pgx" |
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25 |
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26 "gemma.intevation.de/gemma/pkg/auth" |
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27 ) |
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28 |
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29 // JSONResult defines the return type of JSONHandler handler function. |
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30 type JSONResult struct { |
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31 // Code is the HTTP status code to be set which defaults to http.StatusOK (200). |
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32 Code int |
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33 // Result is serialized to JSON. |
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34 // If the type is an io.Reader its copied through. |
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35 Result interface{} |
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36 } |
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37 |
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38 // JSONDefaultLimit is default size limit in bytes of an accepted |
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39 // input document. |
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40 const JSONDefaultLimit = 2048 |
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41 |
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42 // JSONHandler implements a middleware to ease the handing JSON input |
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43 // streams and return JSON documents as output. |
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44 type JSONHandler struct { |
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45 // Input (if not nil) is called to fill a data structure |
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46 // returned by this function. |
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47 Input func(*http.Request) interface{} |
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48 // Handle is called to handle the incoming HTTP request. |
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49 // in is the data structure returned by Input. Its nil if Input is nil. |
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50 // req is the incoming HTTP request. |
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51 // conn is the impersonated connection to the database. |
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52 Handle func(in interface{}, rep *http.Request, conn *sql.Conn) (JSONResult, error) |
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53 // NoConn if set to true no database connection is established and |
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54 // the conn parameter of the Handle call is nil. |
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55 NoConn bool |
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56 // Limit overides the default size of accepted input documents. |
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57 // Set to a negative value to allow an arbitrary size. |
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58 // Handle with care! |
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59 Limit int64 |
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60 } |
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61 |
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62 // JSONError is an error if returned by the JSONHandler.Handle function |
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63 // which ends up encoded as a JSON document. |
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64 type JSONError struct { |
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65 // Code is the HTTP status code of the result defaults |
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66 // to http.StatusInternalServerError if not set. |
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67 Code int |
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68 // The message of the error. |
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69 Message string |
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70 } |
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71 |
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72 // Error implements the error interface. |
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73 func (je JSONError) Error() string { |
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74 return fmt.Sprintf("%d: %s", je.Code, je.Message) |
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75 } |
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76 |
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77 // ServeHTTP makes the JSONHandler a middleware. |
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78 func (j *JSONHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) { |
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79 |
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80 var input interface{} |
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81 if j.Input != nil { |
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82 input = j.Input(req) |
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83 defer req.Body.Close() |
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84 var r io.Reader |
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85 switch { |
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86 case j.Limit == 0: |
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87 r = io.LimitReader(req.Body, JSONDefaultLimit) |
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88 case j.Limit > 0: |
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89 r = io.LimitReader(req.Body, j.Limit) |
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90 default: |
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91 r = req.Body |
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92 } |
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93 if err := json.NewDecoder(r).Decode(input); err != nil { |
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94 http.Error(rw, "error: "+err.Error(), http.StatusBadRequest) |
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95 return |
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96 } |
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97 } |
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98 |
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99 var jr JSONResult |
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100 var err error |
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101 |
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102 if token, ok := auth.GetToken(req); ok && !j.NoConn { |
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103 if session := auth.Sessions.Session(token); session != nil { |
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104 err = auth.RunAs(req.Context(), session.User, func(conn *sql.Conn) error { |
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105 jr, err = j.Handle(input, req, conn) |
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106 return err |
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107 }) |
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108 } else { |
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109 err = auth.ErrNoSuchToken |
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110 } |
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111 } else { |
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112 jr, err = j.Handle(input, req, nil) |
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113 } |
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114 |
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115 if err != nil { |
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116 log.Printf("error: %v\n", err) |
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117 switch e := err.(type) { |
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118 case pgx.PgError: |
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119 var res = struct { |
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120 Result string `json:"result"` |
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121 Code string `json:"code"` |
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122 Message string `json:"message"` |
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123 }{ |
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124 Result: "failure", |
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125 Code: e.Code, |
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126 Message: e.Message, |
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127 } |
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128 rw.Header().Set("Content-Type", "application/json") |
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129 rw.WriteHeader(http.StatusInternalServerError) |
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130 if err := json.NewEncoder(rw).Encode(&res); err != nil { |
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131 log.Printf("error: %v\n", err) |
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132 } |
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133 case JSONError: |
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134 rw.Header().Set("Content-Type", "application/json") |
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135 if e.Code == 0 { |
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136 e.Code = http.StatusInternalServerError |
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137 } |
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138 rw.WriteHeader(e.Code) |
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139 var res = struct { |
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140 Message string `json:"message"` |
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141 }{ |
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142 Message: e.Message, |
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143 } |
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144 if err := json.NewEncoder(rw).Encode(&res); err != nil { |
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145 log.Printf("error: %v\n", err) |
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146 } |
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147 default: |
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148 http.Error(rw, |
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149 "error: "+err.Error(), |
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150 http.StatusInternalServerError) |
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151 } |
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152 return |
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153 } |
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154 |
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155 if jr.Code == 0 { |
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156 jr.Code = http.StatusOK |
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157 } |
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158 |
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159 if jr.Code != http.StatusNoContent { |
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160 rw.Header().Set("Content-Type", "application/json") |
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161 } |
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162 rw.WriteHeader(jr.Code) |
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163 if jr.Code != http.StatusNoContent { |
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164 var err error |
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165 if r, ok := jr.Result.(io.Reader); ok { |
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166 _, err = io.Copy(rw, r) |
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167 } else { |
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168 err = json.NewEncoder(rw).Encode(jr.Result) |
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169 } |
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170 if err != nil { |
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171 log.Printf("error: %v\n", err) |
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172 } |
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173 } |
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174 } |
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175 |
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176 // SendJSON sends data JSON encoded to the response writer |
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177 // with a given HTTP status code. |
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178 func SendJSON(rw http.ResponseWriter, code int, data interface{}) { |
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179 rw.Header().Set("Content-Type", "application/json") |
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180 rw.WriteHeader(code) |
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181 if err := json.NewEncoder(rw).Encode(data); err != nil { |
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182 log.Printf("error: %v\n", err) |
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183 } |
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184 } |