aboutsummaryrefslogtreecommitdiffstats
path: root/golib/httpclient.go
blob: ae6ae8979c6d8eae2009481475b31fa3707148c6 (plain)
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
330
331
332
333
334
335
336
337
338
339
package common

import (
	"bytes"
	"crypto/tls"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"net/http"
	"os"
	"strings"
)

// HTTPClient .
type HTTPClient struct {
	LoggerOut    io.Writer
	LoggerLevel  int
	LoggerPrefix string

	httpClient http.Client
	initDone   bool
	endpoint   string
	apikey     string
	username   string
	password   string
	id         string
	csrf       string
	conf       HTTPClientConfig
}

// HTTPClientConfig is used to config HTTPClient
type HTTPClientConfig struct {
	URLPrefix           string
	HeaderAPIKeyName    string
	Apikey              string
	HeaderClientKeyName string
	CsrfDisable         bool
	LogOut              io.Writer
	LogLevel            int
	LogPrefix           string
}

// Logger levels constants
const (
	HTTPLogLevelPanic   = 0
	HTTPLogLevelError   = 1
	HTTPLogLevelWarning = 2
	HTTPLogLevelInfo    = 3
	HTTPLogLevelDebug   = 4
)

// Inspired by syncthing/cmd/cli

const insecure = false

// HTTPNewClient creates a new HTTP client to deal with Syncthing
func HTTPNewClient(baseURL string, cfg HTTPClientConfig) (*HTTPClient, error) {

	// Create w new Http client
	httpClient := http.Client{
		Transport: &http.Transport{
			TLSClientConfig: &tls.Config{
				InsecureSkipVerify: insecure,
			},
		},
	}

	lOut := cfg.LogOut
	if cfg.LogOut == nil {
		lOut = os.Stdout
	}
	client := HTTPClient{
		LoggerOut:    lOut,
		LoggerLevel:  cfg.LogLevel,
		LoggerPrefix: cfg.LogPrefix,

		httpClient: httpClient,
		initDone:   false,
		endpoint:   baseURL,
		apikey:     cfg.Apikey,
		conf:       cfg,
		/* TODO - add user + pwd support
		username:   c.GlobalString("username"),
		password:   c.GlobalString("password"),
		*/
	}

	if err := client.getCidAndCsrf(); err != nil {
		return &client, err
	}

	client.log(HTTPLogLevelDebug, "HTTP client url %s init Done", client.endpoint)
	client.initDone = true
	return &client, nil
}

// GetLogLevel Get a readable string representing the log level
func (c *HTTPClient) GetLogLevel() string {
	return c.logLevelToString(c.LoggerLevel)
}

// logLevelToString Convert an integer log level to string
func (c *HTTPClient) logLevelToString(lvl int) string {
	switch lvl {
	case HTTPLogLevelPanic:
		return "panic"
	case HTTPLogLevelError:
		return "error"
	case HTTPLogLevelWarning:
		return "warning"
	case HTTPLogLevelInfo:
		return "info"
	case HTTPLogLevelDebug:
		return "debug"
	}
	return "Unknown"
}

// SetLogLevel set the log level from a readable string
func (c *HTTPClient) SetLogLevel(lvl string) error {
	switch strings.ToLower(lvl) {
	case "panic":
		c.LoggerLevel = HTTPLogLevelPanic
	case "error":
		c.LoggerLevel = HTTPLogLevelError
	case "warn", "warning":
		c.LoggerLevel = HTTPLogLevelWarning
	case "info":
		c.LoggerLevel = HTTPLogLevelInfo
	case "debug":
		c.LoggerLevel = HTTPLogLevelDebug
	default:
		return fmt.Errorf("Unknown level")
	}
	return nil
}

func (c *HTTPClient) log(level int, format string, args ...interface{}) {
	if level > c.LoggerLevel {
		return
	}
	sLvl := strings.ToUpper(c.logLevelToString(level))
	fmt.Fprintf(c.LoggerOut, sLvl+": "+c.LoggerPrefix+format+"\n", args...)
}

// Send request to retrieve Client id and/or CSRF token
func (c *HTTPClient) getCidAndCsrf() error {
	// Don't use cid + csrf when apikey is set
	if c.apikey != "" {
		return nil
	}
	request, err := http.NewRequest("GET", c.endpoint, nil)
	if err != nil {
		return err
	}
	if _, err := c.handleRequest(request); err != nil {
		return err
	}
	if c.id == "" {
		return errors.New("Failed to get device ID")
	}
	if !c.conf.CsrfDisable && c.csrf == "" {
		return errors.New("Failed to get CSRF token")
	}
	return nil
}

// GetClientID returns the id
func (c *HTTPClient) GetClientID() string {
	return c.id
}

// formatURL Build full url by concatenating all parts
func (c *HTTPClient) formatURL(endURL string) string {
	url := c.endpoint
	if !strings.HasSuffix(url, "/") {
		url += "/"
	}
	url += strings.TrimLeft(c.conf.URLPrefix, "/")
	if !strings.HasSuffix(url, "/") {
		url += "/"
	}
	return url + strings.TrimLeft(endURL, "/")
}

// HTTPGet Send a Get request to client and return an error object
func (c *HTTPClient) HTTPGet(url string, data *[]byte) error {
	_, err := c._HTTPRequest("GET", url, nil, data)
	return err
}

// HTTPGetWithRes Send a Get request to client and return both response and error
func (c *HTTPClient) HTTPGetWithRes(url string, data *[]byte) (*http.Response, error) {
	return c._HTTPRequest("GET", url, nil, data)
}

// HTTPPost Send a POST request to client and return an error object
func (c *HTTPClient) HTTPPost(url string, body string) error {
	_, err := c._HTTPRequest("POST", url, &body, nil)
	return err
}

// HTTPPostWithRes Send a POST request to client and return both response and error
func (c *HTTPClient) HTTPPostWithRes(url string, body string) (*http.Response, error) {
	return c._HTTPRequest("POST", url, &body, nil)
}

// HTTPPut Send a PUT request to client and return an error object
func (c *HTTPClient) HTTPPut(url string, body string) error {
	_, err := c._HTTPRequest("PUT", url, &body, nil)
	return err
}

// HTTPPutWithRes Send a PUT request to client and return both response and error
func (c *HTTPClient) HTTPPutWithRes(url string, body string) (*http.Response, error) {
	return c._HTTPRequest("PUT", url, &body, nil)
}

// HTTPDelete Send a DELETE request to client and return an error object
func (c *HTTPClient) HTTPDelete(url string) error {
	_, err := c._HTTPRequest("DELETE", url, nil, nil)
	return err
}

// HTTPDeleteWithRes Send a DELETE request to client and return both response and error
func (c *HTTPClient) HTTPDeleteWithRes(url string) (*http.Response, error) {
	return c._HTTPRequest("DELETE", url, nil, nil)
}

// _HTTPRequest Generic function that returns a new Request given a method, URL, and optional body and data.
func (c *HTTPClient) _HTTPRequest(method, url string, body *string, data *[]byte) (*http.Response, error) {
	if !c.initDone {
		if err := c.getCidAndCsrf(); err == nil {
			c.initDone = true
		}
	}

	var err error
	var request *http.Request
	if body != nil {
		request, err = http.NewRequest(method, c.formatURL(url), bytes.NewBufferString(*body))
	} else {
		request, err = http.NewRequest(method, c.formatURL(url), nil)
	}

	if err != nil {
		return nil, err
	}
	res, err := c.handleRequest(request)
	if err != nil {
		return res, err
	}
	if res.StatusCode != 200 {
		return res, errors.New(res.Status)
	}

	if data != nil {
		*data = c.ResponseToBArray(res)
	}

	return res, nil
}

// ResponseToBArray converts an Http response to a byte array
func (c *HTTPClient) ResponseToBArray(response *http.Response) []byte {
	defer response.Body.Close()
	bytes, err := ioutil.ReadAll(response.Body)
	if err != nil {
		c.log(HTTPLogLevelError, "ResponseToBArray failure: %v", err.Error())
	}
	return bytes
}

func (c *HTTPClient) handleRequest(request *http.Request) (*http.Response, error) {
	if c.conf.HeaderAPIKeyName != "" && c.apikey != "" {
		request.Header.Set(c.conf.HeaderAPIKeyName, c.apikey)
	}
	if c.conf.HeaderClientKeyName != "" && c.id != "" {
		request.Header.Set(c.conf.HeaderClientKeyName, c.id)
	}
	if c.username != "" || c.password != "" {
		request.SetBasicAuth(c.username, c.password)
	}
	if c.csrf != "" {
		request.Header.Set("X-CSRF-Token-"+c.id[:5], c.csrf)
	}

	c.log(HTTPLogLevelDebug, "HTTP %s %v", request.Method, request.URL)
	response, err := c.httpClient.Do(request)
	c.log(HTTPLogLevelDebug, "HTTP RESPONSE: %v\n", response)
	if err != nil {
		c.log(HTTPLogLevelInfo, "%v", err)
		return nil, err
	}

	// Detect client ID change
	cid := response.Header.Get(c.conf.HeaderClientKeyName)
	if cid != "" && c.id != cid {
		c.id = cid
	}

	// Detect CSR token change
	for _, item := range response.Cookies() {
		if c.id != "" && item.Name == "CSRF-Token-"+c.id[:5] {
			c.csrf = item.Value
			goto csrffound
		}
	}
	// OK CSRF found
csrffound:

	if response.StatusCode == 404 {
		return nil, errors.New("Invalid endpoint or API call")
	} else if response.StatusCode == 401 {
		return nil, errors.New("Invalid username or password")
	} else if response.StatusCode == 403 {
		if c.apikey == "" {
			// Request a new Csrf for next requests
			c.getCidAndCsrf()
			return nil, errors.New("Invalid CSRF token")
		}
		return nil, errors.New("Invalid API key")
	} else if response.StatusCode != 200 {
		data := make(map[string]interface{})
		// Try to decode error field of APIError struct
		json.Unmarshal(c.ResponseToBArray(response), &data)
		if err, found := data["error"]; found {
			return nil, fmt.Errorf(err.(string))
		}
		body := strings.TrimSpace(string(c.ResponseToBArray(response)))
		if body != "" {
			return nil, fmt.Errorf(body)
		}
		return nil, errors.New("Unknown HTTP status returned: " + response.Status)
	}
	return response, nil
}