annotate pkg/controllers/json.go @ 741:8bb2e48e2dfd

Cosmetics.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 24 Sep 2018 12:42:24 +0200
parents b800eb2a0846
children 7934b5c1a910
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1 package controllers
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2
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3 import (
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4 "database/sql"
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5 "encoding/json"
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6 "fmt"
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7 "io"
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8 "log"
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9 "net/http"
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10
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11 "github.com/jackc/pgx"
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12
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13 "gemma.intevation.de/gemma/pkg/auth"
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14 )
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15
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16 type JSONResult struct {
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17 Code int
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18 Result interface{}
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19 }
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20
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21 type JSONHandler struct {
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22 Input func() interface{}
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23 Handle func(interface{}, *http.Request, *sql.Conn) (JSONResult, error)
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24 NoConn bool
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25 }
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27 type JSONError struct {
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28 Code int
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29 Message string
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30 }
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31
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32 func (je JSONError) Error() string {
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33 return fmt.Sprintf("%d: %s", je.Code, je.Message)
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34 }
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35
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36 func (j *JSONHandler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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37
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38 var input interface{}
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39 if j.Input != nil {
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40 input = j.Input()
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41 defer req.Body.Close()
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42 if err := json.NewDecoder(req.Body).Decode(input); err != nil {
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43 http.Error(rw, "error: "+err.Error(), http.StatusBadRequest)
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44 return
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45 }
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46 }
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48 var jr JSONResult
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49 var err error
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51 if token, ok := auth.GetToken(req); ok && !j.NoConn {
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52 if session := auth.Sessions.Session(token); session != nil {
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53 err = auth.RunAs(session.User, req.Context(), func(conn *sql.Conn) error {
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54 jr, err = j.Handle(input, req, conn)
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55 return err
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56 })
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57 } else {
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58 err = auth.ErrNoSuchToken
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59 }
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60 } else {
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61 jr, err = j.Handle(input, req, nil)
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62 }
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64 if err != nil {
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65 log.Printf("error: %v\n", err)
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66 switch e := err.(type) {
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67 case pgx.PgError:
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68 var res = struct {
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69 Result string `json:"result"`
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70 Code string `json:"code"`
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71 Message string `json:"message"`
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72 }{
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73 Result: "failure",
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74 Code: e.Code,
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75 Message: e.Message,
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76 }
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77 rw.Header().Set("Content-Type", "application/json")
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78 rw.WriteHeader(http.StatusInternalServerError)
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79 if err := json.NewEncoder(rw).Encode(&res); err != nil {
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80 log.Printf("error: %v\n", err)
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81 }
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82 case JSONError:
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83 rw.Header().Set("Content-Type", "application/json")
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84 if e.Code == 0 {
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85 e.Code = http.StatusInternalServerError
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86 }
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87 rw.WriteHeader(e.Code)
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88 var res = struct {
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89 Message string `json:"message"`
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90 }{
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91 Message: e.Message,
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92 }
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93 if err := json.NewEncoder(rw).Encode(&res); err != nil {
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94 log.Printf("error: %v\n", err)
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95 }
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96 default:
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97 http.Error(rw,
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98 "error: "+err.Error(),
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99 http.StatusInternalServerError)
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100 }
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101 return
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102 }
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103
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104 if jr.Code == 0 {
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105 jr.Code = http.StatusOK
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106 }
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107
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108 if jr.Code != http.StatusNoContent {
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109 rw.Header().Set("Content-Type", "application/json")
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110 }
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111 rw.WriteHeader(jr.Code)
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112 if jr.Code != http.StatusNoContent {
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113 var err error
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114 if r, ok := jr.Result.(io.Reader); ok {
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115 _, err = io.Copy(rw, r)
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116 } else {
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117 err = json.NewEncoder(rw).Encode(jr.Result)
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118 }
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119 if err != nil {
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120 log.Printf("error: %v\n", err)
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121 }
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122 }
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123 }