summaryrefslogtreecommitdiffstats
path: root/library/http1.0/http.tcl
blob: 7ee62cd60501faa8b11b3c3928da9afc7fd8dedc (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
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
# http.tcl
# Client-side HTTP for GET, POST, and HEAD commands.
# These routines can be used in untrusted code that uses the Safesock
# security policy.
# These procedures use a callback interface to avoid using vwait,
# which is not defined in the safe base.
#
# SCCS: %Z% $Id: http.tcl,v 1.2 1998/06/29 15:30:24 welch Exp $ 
#
# See the http.n man page for documentation

package provide http 1.0

array set http {
    -accept */*
    -proxyhost {}
    -proxyport {}
    -useragent {Tcl http client package 1.0}
    -proxyfilter httpProxyRequired
}
proc http_config {args} {
    global http
    set options [lsort [array names http -*]]
    set usage [join $options ", "]
    if {[llength $args] == 0} {
	set result {}
	foreach name $options {
	    lappend result $name $http($name)
	}
	return $result
    }
    regsub -all -- - $options {} options
    set pat ^-([join $options |])$
    if {[llength $args] == 1} {
	set flag [lindex $args 0]
	if {[regexp -- $pat $flag]} {
	    return $http($flag)
	} else {
	    return -code error "Unknown option $flag, must be: $usage"
	}
    } else {
	foreach {flag value} $args {
	    if {[regexp -- $pat $flag]} {
		set http($flag) $value
	    } else {
		return -code error "Unknown option $flag, must be: $usage"
	    }
	}
    }
}

 proc httpFinish { token {errormsg ""} } {
    upvar #0 $token state
    global errorInfo errorCode
    if {[string length $errormsg] != 0} {
	set state(error) [list $errormsg $errorInfo $errorCode]
	set state(status) error
    }
    catch {close $state(sock)}
    catch {after cancel $state(after)}
    if {[info exists state(-command)]} {
	if {[catch {eval $state(-command) {$token}} err]} {
	    if {[string length $errormsg] == 0} {
		set state(error) [list $err $errorInfo $errorCode]
		set state(status) error
	    }
	}
	unset state(-command)
    }
}
proc http_reset { token {why reset} } {
    upvar #0 $token state
    set state(status) $why
    catch {fileevent $state(sock) readable {}}
    httpFinish $token
    if {[info exists state(error)]} {
	set errorlist $state(error)
	unset state(error)
	eval error $errorlist
    }
}
proc http_get { url args } {
    global http
    if {![info exists http(uid)]} {
	set http(uid) 0
    }
    set token http#[incr http(uid)]
    upvar #0 $token state
    http_reset $token
    array set state {
	-blocksize 	8192
	-validate 	0
	-headers 	{}
	-timeout 	0
	state		header
	meta		{}
	currentsize	0
	totalsize	0
        type            text/html
        body            {}
	status		""
    }
    set options {-blocksize -channel -command -handler -headers \
		-progress -query -validate -timeout}
    set usage [join $options ", "]
    regsub -all -- - $options {} options
    set pat ^-([join $options |])$
    foreach {flag value} $args {
	if {[regexp $pat $flag]} {
	    # Validate numbers
	    if {[info exists state($flag)] && \
		    [regexp {^[0-9]+$} $state($flag)] && \
		    ![regexp {^[0-9]+$} $value]} {
		return -code error "Bad value for $flag ($value), must be integer"
	    }
	    set state($flag) $value
	} else {
	    return -code error "Unknown option $flag, can be: $usage"
	}
    }
    if {! [regexp -nocase {^(http://)?([^/:]+)(:([0-9]+))?(/.*)?$} $url \
	    x proto host y port srvurl]} {
	error "Unsupported URL: $url"
    }
    if {[string length $port] == 0} {
	set port 80
    }
    if {[string length $srvurl] == 0} {
	set srvurl /
    }
    if {[string length $proto] == 0} {
	set url http://$url
    }
    set state(url) $url
    if {![catch {$http(-proxyfilter) $host} proxy]} {
	set phost [lindex $proxy 0]
	set pport [lindex $proxy 1]
    }
    if {$state(-timeout) > 0} {
	set state(after) [after $state(-timeout) [list http_reset $token timeout]]
    }
    if {[info exists phost] && [string length $phost]} {
	set srvurl $url
	set s [socket $phost $pport]
    } else {
	set s [socket $host $port]
    }
    set state(sock) $s

    # Send data in cr-lf format, but accept any line terminators

    fconfigure $s -translation {auto crlf} -buffersize $state(-blocksize)

    # The following is disallowed in safe interpreters, but the socket
    # is already in non-blocking mode in that case.

    catch {fconfigure $s -blocking off}
    set len 0
    set how GET
    if {[info exists state(-query)]} {
	set len [string length $state(-query)]
	if {$len > 0} {
	    set how POST
	}
    } elseif {$state(-validate)} {
	set how HEAD
    }
    puts $s "$how $srvurl HTTP/1.0"
    puts $s "Accept: $http(-accept)"
    puts $s "Host: $host"
    puts $s "User-Agent: $http(-useragent)"
    foreach {key value} $state(-headers) {
	regsub -all \[\n\r\]  $value {} value
	set key [string trim $key]
	if {[string length $key]} {
	    puts $s "$key: $value"
	}
    }
    if {$len > 0} {
	puts $s "Content-Length: $len"
	puts $s "Content-Type: application/x-www-form-urlencoded"
	puts $s ""
	fconfigure $s -translation {auto binary}
	puts $s $state(-query)
    } else {
	puts $s ""
    }
    flush $s
    fileevent $s readable [list httpEvent $token]
    if {! [info exists state(-command)]} {
	http_wait $token
    }
    return $token
}
proc http_data {token} {
    upvar #0 $token state
    return $state(body)
}
proc http_status {token} {
    upvar #0 $token state
    return $state(status)
}
proc http_code {token} {
    upvar #0 $token state
    return $state(http)
}
proc http_size {token} {
    upvar #0 $token state
    return $state(currentsize)
}

 proc httpEvent {token} {
    upvar #0 $token state
    set s $state(sock)

     if {[eof $s]} {
	httpEof $token
	return
    }
    if {$state(state) == "header"} {
	set n [gets $s line]
	if {$n == 0} {
	    set state(state) body
	    if {![regexp -nocase ^text $state(type)]} {
		# Turn off conversions for non-text data
		fconfigure $s -translation binary
		if {[info exists state(-channel)]} {
		    fconfigure $state(-channel) -translation binary
		}
	    }
	    if {[info exists state(-channel)] &&
		    ![info exists state(-handler)]} {
		# Initiate a sequence of background fcopies
		fileevent $s readable {}
		httpCopyStart $s $token
	    }
	} elseif {$n > 0} {
	    if {[regexp -nocase {^content-type:(.+)$} $line x type]} {
		set state(type) [string trim $type]
	    }
	    if {[regexp -nocase {^content-length:(.+)$} $line x length]} {
		set state(totalsize) [string trim $length]
	    }
	    if {[regexp -nocase {^([^:]+):(.+)$} $line x key value]} {
		lappend state(meta) $key $value
	    } elseif {[regexp ^HTTP $line]} {
		set state(http) $line
	    }
	}
    } else {
	if {[catch {
	    if {[info exists state(-handler)]} {
		set n [eval $state(-handler) {$s $token}]
	    } else {
		set block [read $s $state(-blocksize)]
		set n [string length $block]
		if {$n >= 0} {
		    append state(body) $block
		}
	    }
	    if {$n >= 0} {
		incr state(currentsize) $n
	    }
	} err]} {
	    httpFinish $token $err
	} else {
	    if {[info exists state(-progress)]} {
		eval $state(-progress) {$token $state(totalsize) $state(currentsize)}
	    }
	}
    }
}
 proc httpCopyStart {s token} {
    upvar #0 $token state
    if {[catch {
	fcopy $s $state(-channel) -size $state(-blocksize) -command \
	    [list httpCopyDone $token]
    } err]} {
	httpFinish $token $err
    }
}
 proc httpCopyDone {token count {error {}}} {
    upvar #0 $token state
    set s $state(sock)
    incr state(currentsize) $count
    if {[info exists state(-progress)]} {
	eval $state(-progress) {$token $state(totalsize) $state(currentsize)}
    }
    if {([string length $error] != 0)} {
	httpFinish $token $error
    } elseif {[eof $s]} {
	httpEof $token
    } else {
	httpCopyStart $s $token
    }
}
 proc httpEof {token} {
    upvar #0 $token state
    if {$state(state) == "header"} {
	# Premature eof
	set state(status) eof
    } else {
	set state(status) ok
    }
    set state(state) eof
    httpFinish $token
}
proc http_wait {token} {
    upvar #0 $token state
    if {![info exists state(status)] || [string length $state(status)] == 0} {
	vwait $token\(status)
    }
    if {[info exists state(error)]} {
	set errorlist $state(error)
	unset state(error)
	eval error $errorlist
    }
    return $state(status)
}

# Call http_formatQuery with an even number of arguments, where the first is
# a name, the second is a value, the third is another name, and so on.

proc http_formatQuery {args} {
    set result ""
    set sep ""
    foreach i $args {
	append result  $sep [httpMapReply $i]
	if {$sep != "="} {
	    set sep =
	} else {
	    set sep &
	}
    }
    return $result
}

# do x-www-urlencoded character mapping
# The spec says: "non-alphanumeric characters are replaced by '%HH'"
# 1 leave alphanumerics characters alone
# 2 Convert every other character to an array lookup
# 3 Escape constructs that are "special" to the tcl parser
# 4 "subst" the result, doing all the array substitutions
 
 proc httpMapReply {string} {
    global httpFormMap
    set alphanumeric	a-zA-Z0-9
    if {![info exists httpFormMap]} {
	 
	for {set i 1} {$i <= 256} {incr i} {
	    set c [format %c $i]
	    if {![string match \[$alphanumeric\] $c]} {
		set httpFormMap($c) %[format %.2x $i]
	    }
	}
	# These are handled specially
	array set httpFormMap {
	    " " +   \n %0d%0a
	}
    }
    regsub -all \[^$alphanumeric\] $string {$httpFormMap(&)} string
    regsub -all \n $string {\\n} string
    regsub -all \t $string {\\t} string
    regsub -all {[][{})\\]\)} $string {\\&} string
    return [subst $string]
}

# Default proxy filter. 
 proc httpProxyRequired {host} {
    global http
    if {[info exists http(-proxyhost)] && [string length $http(-proxyhost)]} {
	if {![info exists http(-proxyport)] || ![string length $http(-proxyport)]} {
	    set http(-proxyport) 8080
	}
	return [list $http(-proxyhost) $http(-proxyport)]
    } else {
	return {}
    }
}