1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
|
package xml
import (
"bytes"
"encoding/xml"
"io"
"strings"
"testing"
"github.com/google/go-cmp/cmp"
)
func TestXMLNodeDecoder_Token(t *testing.T) {
cases := map[string]struct {
responseBody io.Reader
expectedStartElement xml.StartElement
expectedDone bool
expectedError string
}{
"simple success case": {
responseBody: bytes.NewReader([]byte(`<Response>abc</Response>`)),
expectedStartElement: xml.StartElement{
Name: xml.Name{
Local: "",
},
},
expectedDone: true,
},
"no value": {
responseBody: bytes.NewReader([]byte(`<Response></Response>`)),
expectedDone: true,
},
"empty body": {
responseBody: bytes.NewReader([]byte(``)),
expectedError: "EOF",
},
"with indentation": {
responseBody: bytes.NewReader([]byte(` <Response><Struct>abc</Struct></Response>`)),
expectedStartElement: xml.StartElement{
Name: xml.Name{
Local: "Struct",
},
Attr: []xml.Attr{},
},
},
"with comment and indentation": {
responseBody: bytes.NewReader([]byte(`<!--comment--> <Response><Struct>abc</Struct></Response>`)),
expectedStartElement: xml.StartElement{
Name: xml.Name{
Local: "Struct",
},
Attr: []xml.Attr{},
},
},
"attr with namespace": {
responseBody: bytes.NewReader([]byte(`<Response><Grantee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="CanonicalUser"></Grantee></Response>`)),
expectedStartElement: xml.StartElement{
Name: xml.Name{
Local: "Grantee",
},
Attr: []xml.Attr{
{
Name: xml.Name{
Space: "xmlns",
Local: "xsi",
},
Value: "http://www.w3.org/2001/XMLSchema-instance",
},
{
Name: xml.Name{
Space: "xsi",
Local: "type",
},
Value: "CanonicalUser",
},
},
},
},
}
for name, c := range cases {
t.Run(name, func(t *testing.T) {
xmlDecoder := xml.NewDecoder(c.responseBody)
st, err := FetchRootElement(xmlDecoder)
if err != nil {
if len(c.expectedError) == 0 {
t.Fatalf("Expected no error, got %v", err)
}
if e, a := c.expectedError, err; !strings.Contains(err.Error(), c.expectedError) {
t.Fatalf("expected error to contain %v, found %v", e, a.Error())
}
}
nodeDecoder := WrapNodeDecoder(xmlDecoder, st)
token, done, err := nodeDecoder.Token()
if err != nil {
if len(c.expectedError) == 0 {
t.Fatalf("Expected no error, got %v", err)
}
if e, a := c.expectedError, err; !strings.Contains(err.Error(), c.expectedError) {
t.Fatalf("expected error to contain %v, found %v", e, a.Error())
}
}
if e, a := c.expectedDone, done; e != a {
t.Fatalf("expected a valid end element token for the xml document, got none")
}
if diff := cmp.Diff(c.expectedStartElement, token); len(diff) != 0 {
t.Fatalf("Found diff : (-expected,+actual), \n %v", diff)
}
})
}
}
func TestXMLNodeDecoder_TokenExample(t *testing.T) {
responseBody := bytes.NewReader([]byte(`<Struct><Response>abc</Response></Struct>`))
xmlDecoder := xml.NewDecoder(responseBody)
// Fetches <Struct> tag as start element.
st, err := FetchRootElement(xmlDecoder)
if err != nil {
t.Fatalf("Expected no error, got %v", err)
}
// nodeDecoder will track <Struct> tag as root node of the document
nodeDecoder := WrapNodeDecoder(xmlDecoder, st)
// Retrieves <Response> tag
token, done, err := nodeDecoder.Token()
if err != nil {
t.Fatalf("Expected no error, got %v", err)
}
if diff := cmp.Diff(token, xml.StartElement{Name: xml.Name{Local: "Response"}, Attr: []xml.Attr{}}); len(diff) != 0 {
t.Fatalf("Found diff : (-expected,+actual), \n %v", diff)
}
if done {
t.Fatalf("expected decoding to not be done yet")
}
// Skips the value and gets </Response> that is the end token of previously retrieved <Response> tag.
// The way node decoder works it only keeps track of the root start tag using which it was initialized.
// Here <Struct> is used to initialize, while</Response> is end element corresponding to already read
// <Response> tag. We won't be done until we receive </Struct>
token, done, err = nodeDecoder.Token()
if err != nil {
t.Fatalf("Expected no error, got %v", err)
}
if diff := cmp.Diff(token, xml.StartElement{Name: xml.Name{Local: ""}, Attr: nil}); len(diff) != 0 {
t.Fatalf("Found diff : (-expected,+actual), \n %v", diff)
}
if done {
t.Fatalf("expected decoding to not be done yet")
}
// Retrieves </Struct> end element tag corresponding to <Struct> tag.
// Since we got the end element that corresponds to the start element being track, we are done decoding.
token, done, err = nodeDecoder.Token()
if err != nil {
t.Fatalf("Expected no error, got %v", err)
}
if diff := cmp.Diff(token, xml.StartElement{Name: xml.Name{Local: ""}, Attr: nil}); len(diff) != 0 {
t.Fatalf("Found diff : (-expected,+actual), \n %v", diff)
}
if !done {
t.Fatalf("expected decoding to be done as we fetched the end element </Struct>")
}
}
func TestXMLNodeDecoder_Value(t *testing.T) {
cases := map[string]struct {
responseBody io.Reader
expectedValue []byte
expectedDone bool
expectedError string
}{
"simple success case": {
responseBody: bytes.NewReader([]byte(`<Response>abc</Response>`)),
expectedValue: []byte(`abc`),
},
"no value": {
responseBody: bytes.NewReader([]byte(`<Response></Response>`)),
expectedValue: []byte{},
},
"self-closing": {
responseBody: bytes.NewReader([]byte(`<Response />`)),
expectedValue: []byte{},
},
"empty body": {
responseBody: bytes.NewReader([]byte(``)),
expectedError: "EOF",
},
"start element retrieved": {
responseBody: bytes.NewReader([]byte(`<Response><Struct>abc</Struct></Response>`)),
expectedError: "expected value for Response element, got xml.StartElement type",
},
}
for name, c := range cases {
t.Run(name, func(t *testing.T) {
xmlDecoder := xml.NewDecoder(c.responseBody)
st, err := FetchRootElement(xmlDecoder)
if err != nil {
if len(c.expectedError) == 0 {
t.Fatalf("Expected no error, got %v", err)
}
if e, a := c.expectedError, err; !strings.Contains(err.Error(), c.expectedError) {
t.Fatalf("expected error to contain %v, found %v", e, a.Error())
}
}
nodeDecoder := WrapNodeDecoder(xmlDecoder, st)
token, err := nodeDecoder.Value()
if err != nil {
if len(c.expectedError) == 0 {
t.Fatalf("Expected no error, got %v", err)
}
if e, a := c.expectedError, err; !strings.Contains(err.Error(), c.expectedError) {
t.Fatalf("expected error to contain %v, found %v", e, a.Error())
}
}
if diff := cmp.Diff(c.expectedValue, token); len(diff) != 0 {
t.Fatalf("Found diff : (-expected,+actual), \n %v", diff)
}
})
}
}
func Test_FetchXMLRootElement(t *testing.T) {
cases := map[string]struct {
responseBody io.Reader
expectedStartElement xml.StartElement
expectedError string
}{
"simple success case": {
responseBody: bytes.NewReader([]byte(`<Response><Struct>abc</Struct></Response>`)),
expectedStartElement: xml.StartElement{
Name: xml.Name{
Local: "Response",
},
Attr: []xml.Attr{},
},
},
"empty body": {
responseBody: bytes.NewReader([]byte(``)),
expectedError: "EOF",
},
"with indentation": {
responseBody: bytes.NewReader([]byte(` <ErrorResponse>
<Error>
<Type>Sender</Type>
<Code>InvalidGreeting</Code>
<Message>Hi</Message>
<AnotherSetting>setting</AnotherSetting>
</Error>
<RequestId>foo-id</RequestId>
</ErrorResponse>`)),
expectedStartElement: xml.StartElement{
Name: xml.Name{
Local: "ErrorResponse",
},
Attr: []xml.Attr{},
},
},
"with preamble": {
responseBody: bytes.NewReader([]byte(`<?xml version = "1.0" encoding = "UTF-8" standalone = "no" ?>
<ErrorResponse>
<Error>
<Type>Sender</Type>
<Code>InvalidGreeting</Code>
<Message>Hi</Message>
<AnotherSetting>setting</AnotherSetting>
</Error>
<RequestId>foo-id</RequestId>
</ErrorResponse>`)),
expectedStartElement: xml.StartElement{
Name: xml.Name{
Local: "ErrorResponse",
},
Attr: []xml.Attr{},
},
},
"with comments": {
responseBody: bytes.NewReader([]byte(`<!--Sample comment for testing-->
<?xml version = "1.0" encoding = "UTF-8" standalone = "no" ?>
<ErrorResponse>
<Error>
<Type>Sender</Type>
<Code>InvalidGreeting</Code>
<Message>Hi</Message>
<AnotherSetting>setting</AnotherSetting>
</Error>
<RequestId>foo-id</RequestId>
</ErrorResponse>`)),
expectedStartElement: xml.StartElement{
Name: xml.Name{
Local: "ErrorResponse",
},
Attr: []xml.Attr{},
},
},
}
for name, c := range cases {
t.Run(name, func(t *testing.T) {
decoder := xml.NewDecoder(c.responseBody)
st, err := FetchRootElement(decoder)
if err != nil {
if len(c.expectedError) == 0 {
t.Fatalf("Expected no error, got %v", err)
}
if e, a := c.expectedError, err; !strings.Contains(err.Error(), c.expectedError) {
t.Fatalf("expected error to contain %v, found %v", e, a.Error())
}
}
if diff := cmp.Diff(c.expectedStartElement, st); len(diff) != 0 {
t.Fatalf("Found diff : (-expected,+actual), \n %v", diff)
}
})
}
}
|
