Mercurial > gemma
annotate pkg/middleware/json.go @ 4855:01b593ea2311
Added missing doc strings for the STR tree in the mesh package.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Tue, 19 Nov 2019 17:48:02 +0100 |
parents | 4394daeea96a |
children | 6270951dda28 |
rev | line source |
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ef59a4255670
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.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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1 // This is Free Software under GNU Affero General Public License v >= 3.0 |
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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.
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2 // without warranty, see README.md and license for details. |
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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.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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3 // |
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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.
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4 // SPDX-License-Identifier: AGPL-3.0-or-later |
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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.
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5 // License-Filename: LICENSES/AGPL-3.0.txt |
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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.
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6 // |
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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.
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7 // Copyright (C) 2019 by via donau |
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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.
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH |
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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.
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9 // Software engineering by Intevation GmbH |
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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.
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10 // |
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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.
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11 // Author(s): |
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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.
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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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.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13 |
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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.
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14 package middleware |
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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.
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15 |
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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.
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16 import ( |
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17 "context" |
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18 "encoding/json" |
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19 "io" |
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20 "net/http" |
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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.
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21 ) |
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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.
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22 |
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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.
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23 type jsonInputKeyType int |
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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.
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24 |
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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.
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25 const jsonInputKey jsonInputKeyType = 0 |
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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.
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26 |
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27 // DefaultLimit limits the incoming JSON payload to 2K to |
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28 // prevent flooding the server. |
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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.
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29 const DefaultLimit = 2048 |
ef59a4255670
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.
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30 |
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31 // GetJSONInput returns the deserialized JSON data from |
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32 // the incoming request if any. |
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33 func GetJSONInput(req *http.Request) interface{} { |
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34 return req.Context().Value(jsonInputKey) |
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35 } |
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36 |
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37 // JSONMiddleware is a middleware to deserialize the incomming |
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38 // request body to a object to be created by a given input function |
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39 // and stores the result into the context. |
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40 // GetJSONInput can be used to receive the deserialized data. |
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41 // limit limits the size of the incoming body to prevent |
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Made 'golint' and 'staticcheck' happy with middleware package.
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42 // flooding the server. |
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43 func JSONMiddleware(next http.Handler, input func(*http.Request) interface{}, limit int64) http.Handler { |
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44 |
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45 return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) { |
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46 dst := input(req) |
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47 defer req.Body.Close() |
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48 var r io.Reader |
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49 switch { |
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50 case limit == 0: |
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51 r = io.LimitReader(req.Body, DefaultLimit) |
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52 case limit > 0: |
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53 r = io.LimitReader(req.Body, limit) |
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54 default: |
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55 r = req.Body |
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56 } |
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57 if err := json.NewDecoder(r).Decode(dst); err != nil { |
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58 http.Error(rw, "error: "+err.Error(), http.StatusBadRequest) |
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59 return |
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60 } |
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61 parent := req.Context() |
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62 ctx := context.WithValue(parent, jsonInputKey, input) |
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63 req = req.WithContext(ctx) |
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64 next.ServeHTTP(rw, req) |
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65 }) |
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66 } |