source: binary-improvements2/MapRendering/Web/API/AbsRestApi.cs@ 388

Last change on this file since 388 was 388, checked in by alloc, 3 years ago

Added first version of REST API support
File size: 3.9 KB
Line 
1using System;
2using System.IO;
3using System.Net;
4using AllocsFixes.JSON;
5
6namespace AllocsFixes.NetConnections.Servers.Web.API {
7 public abstract class AbsRestApi : AbsWebAPI {
8 public sealed override void HandleRequest (RequestContext _context) {
9 JSONNode jsonBody = null;
10
11 if (_context.Request.HasEntityBody) {
12 string body = new StreamReader (_context.Request.InputStream).ReadToEnd ();
13
14 if (!string.IsNullOrEmpty (body)) {
15 try {
16 jsonBody = Parser.Parse (body);
17 } catch (Exception e) {
18 SendEnvelopedResult (_context, null, HttpStatusCode.BadRequest, null, "INVALID_BODY", e);
19 return;
20 }
21 }
22 }
23
24 try {
25 switch (_context.Request.HttpMethod) {
26 case "GET":
27 if (jsonBody != null) {
28 SendEnvelopedResult (_context, null, HttpStatusCode.BadRequest, jsonBody, "GET_WITH_BODY");
29 return;
30 }
31
32 HandleRestGet (_context);
33 return;
34 case "POST":
35 if (!string.IsNullOrEmpty (_context.RequestPath)) {
36 SendEnvelopedResult (_context, null, HttpStatusCode.BadRequest, jsonBody, "POST_WITH_ID");
37 return;
38 }
39
40 if (jsonBody == null) {
41 SendEnvelopedResult (_context, null, HttpStatusCode.BadRequest, null, "POST_WITHOUT_BODY");
42 return;
43 }
44
45 HandleRestPost (_context, jsonBody);
46 return;
47 case "PUT":
48 if (string.IsNullOrEmpty (_context.RequestPath)) {
49 SendEnvelopedResult (_context, null, HttpStatusCode.BadRequest, jsonBody, "PUT_WITHOUT_ID");
50 return;
51 }
52
53 if (jsonBody == null) {
54 SendEnvelopedResult (_context, null, HttpStatusCode.BadRequest, null, "PUT_WITHOUT_BODY");
55 return;
56 }
57
58 HandleRestPut (_context, jsonBody);
59 return;
60 case "DELETE":
61 if (string.IsNullOrEmpty (_context.RequestPath)) {
62 SendEnvelopedResult (_context, null, HttpStatusCode.BadRequest, jsonBody, "DELETE_WITHOUT_ID");
63 return;
64 }
65
66 if (jsonBody != null) {
67 SendEnvelopedResult (_context, null, HttpStatusCode.BadRequest, null, "DELETE_WITH_BODY");
68 return;
69 }
70
71 HandleRestDelete (_context);
72 return;
73 default:
74 SendEnvelopedResult (_context, null, HttpStatusCode.BadRequest, null, "INVALID_METHOD");
75 return;
76 }
77 } catch (Exception e) {
78 SendEnvelopedResult (_context, null, HttpStatusCode.InternalServerError, jsonBody, "ERROR_PROCESSING", _exception: e);
79 }
80 }
81
82 private static readonly JSONArray emptyData = new JSONArray ();
83
84 protected void SendEnvelopedResult (RequestContext _context, JSONNode _resultData, HttpStatusCode _statusCode = HttpStatusCode.OK,
85 JSONNode _jsonInputBody = null, string _errorCode = null, Exception _exception = null) {
86 JSONObject meta = new JSONObject ();
87
88 meta.Add ("serverTime", new JSONString (DateTime.Now.ToString ("o")));
89 if (!string.IsNullOrEmpty (_errorCode)) {
90 meta.Add ("requestMethod", new JSONString (_context.Request.HttpMethod));
91 meta.Add ("requestSubpath", new JSONString (_context.RequestPath));
92 meta.Add ("requestBody", new JSONString (_jsonInputBody?.ToString () ?? "-empty-"));
93 meta.Add ("errorCode", new JSONString (_errorCode));
94 if (_exception != null) {
95 meta.Add ("exceptionMessage", new JSONString (_exception.Message));
96 meta.Add ("exceptionTrace", new JSONString (_exception.StackTrace));
97 }
98 }
99
100 JSONObject envelope = new JSONObject ();
101 envelope.Add ("meta", meta);
102 envelope.Add ("data", _resultData ?? emptyData);
103
104 WebUtils.WriteJson (_context.Response, envelope, _statusCode);
105 }
106
107 protected abstract void HandleRestGet (RequestContext _context);
108
109 protected abstract void HandleRestPost (RequestContext _context, JSONNode _jsonBody);
110
111 protected abstract void HandleRestPut (RequestContext _context, JSONNode _jsonBody);
112
113 protected abstract void HandleRestDelete (RequestContext _context);
114 }
115}
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