Mercurial > gemma

annotate pkg/middleware/modifyquery.go @ 2690:ef59a4255670

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Added http middlewares to connect to db and parse input as JSON. This complements the JSONHandler which is for JSON in to JSON out. The new middlewares are for JSON in to abitrary out.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 15 Mar 2019 16:45:34 +0100
parents 04967d6565fa
children 5f47eeea988d
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rev   line source
1017
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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 middleware
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15
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16 import (
467
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17 "encoding/hex"
419
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18 "log"
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19 "net/http"
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20 "net/url"
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21 "strings"
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22
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23 "gemma.intevation.de/gemma/pkg/auth"
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24 )
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25
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26 // ParseQuery is a modified version of the internal query
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27 // parser of the url.parseQuery of the standard library.
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28 func ParseQuery(
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29 m url.Values,
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30 query string,
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31 keySep, valueSep string,
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32 unescape func(string) (string, error),
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33 ) error {
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34 if unescape == nil {
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35 unescape = url.QueryUnescape
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36 }
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37 for query != "" {
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38 key := query
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39 if i := strings.Index(key, keySep); i >= 0 {
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40 key, query = key[:i], key[i+1:]
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41
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42 } else {
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43 query = ""
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44 }
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45 if key == "" {
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46 continue
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47 }
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48 value := ""
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49 if i := strings.Index(key, valueSep); i >= 0 {
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50 key, value = key[:i], key[i+1:]
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51 }
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52 key, err := unescape(key)
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53 if err != nil {
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54 return err
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55 }
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56 value, err = unescape(value)
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57 if err != nil {
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58 return err
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59 }
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60 m[key] = append(m[key], value)
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61 }
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62 return nil
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63 }
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64
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65 // ModifyQuery creates an http.Handler which calls a modify function first before
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66 // calling the the nested next http.Handler.
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67 func ModifyQuery(next http.Handler, modify func(*http.Request, url.Values) error) http.Handler {
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68
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69 return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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70
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71 // GeoServer query parameters contain ';' as sub key separators.
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72 // If we would use req.URL.Query() this would be split
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73 // at the wrong level resulting in broken key/value pairs.
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74 // So we do the splitting ourselves.
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75
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76 parameters := make(url.Values)
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77
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78 if err := ParseQuery(parameters, req.URL.RawQuery, "&", "=", nil); err != nil {
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79 log.Printf("parsing query failed: %v\n", err)
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80 http.Error(rw, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
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81 return
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82 }
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83
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84 if err := modify(req, parameters); err != nil {
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85 log.Printf("modifying query parameters failed: %v\n", err)
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86 http.Error(rw, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
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87 }
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88
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89 req.URL.RawQuery = parameters.Encode()
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90
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91 next.ServeHTTP(rw, req)
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92 })
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93 }
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94
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95 // InjectUser is a modify function fitting into ModifyQuery to inject the
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96 // user's name from the current session hex-encoded into the 'env' query parameter.
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97 // This is used by the GeoServer to restrict the access to this the user/role
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98 // to show show the requested map.
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99 func InjectUser(req *http.Request, parameters url.Values) error {
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100 // To prevent SQL injections
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101 parameters.Del("env")
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102
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1b08432a0e5d Cosmetics.
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103 if session, ok := auth.GetSession(req); ok {
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104 // log.Printf("info: injecting user %s\n", session.User)
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105 parameters.Set("env", "user:"+hex.EncodeToString([]byte(session.User)))
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106 }
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107 return nil
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108 }