summaryrefslogtreecommitdiffstats
path: root/library/http2.1/http.tcl
blob: c59f4a55c5361677c6d9bfb141fd9bd1c033a9a4 (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
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
# 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.
#
# See the file "license.terms" for information on usage and
# redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# RCS: @(#) $Id: http.tcl,v 1.10 1999/08/19 02:59:45 hobbs Exp $

package provide http 2.1	;# This uses Tcl namespaces

namespace eval http {
    variable http

    array set http {
	-accept */*
	-proxyhost {}
	-proxyport {}
	-useragent {Tcl http client package 2.1}
	-proxyfilter http::ProxyRequired
    }

    variable formMap
    set alphanumeric	a-zA-Z0-9

    variable i 0
    for {} {$i <= 256} {incr i} {
	set c [format %c $i]
	if {![string match \[$alphanumeric\] $c]} {
	    set formMap($c) %[format %.2x $i]
	}
    }
    # These are handled specially
    array set formMap {
	" " +   \n %0d%0a
    }

    namespace export geturl config reset wait formatQuery 
    # Useful, but not exported: data size status code
}

# http::config --
#
#	See documentaion for details.
#
# Arguments:
#	args		Options parsed by the procedure.
# Results:
#        TODO

proc http::config {args} {
    variable 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 http::Finish { token {errormsg ""} } {
    variable $token
    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
	    }
	}
	if {[info exist state(-command)]} {
	    # Command callback may already have unset our state
	    unset state(-command)
	}
    }
}

# http::reset --
#
#	See documentaion for details.
#
# Arguments:
#	token	Connection token.
#	why	Status info.
# Results:
#        TODO

proc http::reset { token {why reset} } {
    variable $token
    upvar 0 $token state
    set state(status) $why
    catch {fileevent $state(sock) readable {}}
    Finish $token
    if {[info exists state(error)]} {
	set errorlist $state(error)
	unset state(error)
	eval error $errorlist
    }
}

# http::geturl --
#
#	Establishes a connection to a remote url via http.
#
# Arguments:
#       url		The http URL to goget.
#       args		Option value pairs. Valid options include:
#				-blocksize, -validate, -headers, -timeout
# Results:
#	Returns a token for this connection.
#	This token is the name of an array that the caller should
#	unset to garbage collect the state.

proc http::geturl { url args } {
    variable http

    # Initialize the state variable, an array.  We'll return the
    # name of this array as the token for the transaction.

    if {![info exists http(uid)]} {
	set http(uid) 0
    }
    set token [namespace current]::[incr http(uid)]
    variable $token
    upvar 0 $token state
    reset $token

    # Process command options.

    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)] && \
		    [string is integer -strict $state($flag)] && \
		    ![string is integer -strict $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 a timeout is specified we set up the after event
    # and arrange for an asynchronous socket connection.

    if {$state(-timeout) > 0} {
	set state(after) [after $state(-timeout) \
		[list http::reset $token timeout]]
	set async -async
    } else {
	set async ""
    }

    # If we are using the proxy, we must pass in the full URL that
    # includes the server name.

    if {[info exists phost] && [string length $phost]} {
	set srvurl $url
	set s [eval socket $async {$phost $pport}]
    } else {
	set s [eval socket $async {$host $port}]
    }
    set state(sock) $s

    # Wait for the connection to complete

    if {$state(-timeout) > 0} {
	#fileevent $s writable [list set $token\(status) connect]
	fileevent $s writable [list http::Connect $token]
	http::wait $token
	if {[string equal $state(status) "timeout"]} {
	    return
	}
	fileevent $s writable {}
	unset state(status)
    }

    # 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 http::Event $token]
    if {! [info exists state(-command)]} {
	wait $token
    }
    return $token
}

# Data access functions:
# Data - the URL data
# Status - the transaction status: ok, reset, eof, timeout
# Code - the HTTP transaction code, e.g., 200
# Size - the size of the URL data

proc http::data {token} {
    variable $token
    upvar 0 $token state
    return $state(body)
}
proc http::status {token} {
    variable $token
    upvar 0 $token state
    return $state(status)
}
proc http::code {token} {
    variable $token
    upvar 0 $token state
    return $state(http)
}
proc http::size {token} {
    variable $token
    upvar 0 $token state
    return $state(currentsize)
}

# http::cleanup
#
#	Garbage collect the state associated with a transaction
#
# Arguments
#	token	The token returned from http::geturl
#
# Side Effects
#	unsets the state array

proc http::cleanup {token} {
    variable $token
    upvar 0 $token state
    if {[info exist state]} {
	unset state
    }
}
 proc http::Connect {token} {
    variable $token
    upvar 0 $token state
    set state(status) connect
 }

 proc http::Event {token} {
    variable $token
    upvar 0 $token state
    set s $state(sock)

     if {[::eof $s]} {
	Eof $token
	return
    }
    if {[string equal $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 {}
		CopyStart $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]} {
	    Finish $token $err
	} else {
	    if {[info exists state(-progress)]} {
		eval $state(-progress) {$token $state(totalsize) $state(currentsize)}
	    }
	}
    }
}
 proc http::CopyStart {s token} {
    variable $token
    upvar 0 $token state
    if {[catch {
	fcopy $s $state(-channel) -size $state(-blocksize) -command \
	    [list http::CopyDone $token]
    } err]} {
	Finish $token $err
    }
}
 proc http::CopyDone {token count {error {}}} {
    variable $token
    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)}
    }
    # At this point the token may have been reset
    if {[string length $error]} {
	Finish $token $error
    } elseif {[catch {::eof $s} iseof] || $iseof} {
	Eof $token
    } else {
	CopyStart $s $token
    }
}
 proc http::Eof {token} {
    variable $token
    upvar 0 $token state
    if {[string equal $state(state) "header"]} {
	# Premature eof
	set state(status) eof
    } else {
	set state(status) ok
    }
    set state(state) eof
    Finish $token
}

# http::wait --
#
#	See documentaion for details.
#
# Arguments:
#	token	Connection token.
# Results:
#        The status after the wait.

proc http::wait {token} {
    variable $token
    upvar 0 $token state

    if {![info exists state(status)] || [string length $state(status)] == 0} {
	# We must wait on the original variable name, not the upvar alias
	vwait $token\(status)
    }
    if {[info exists state(error)]} {
	set errorlist $state(error)
	unset state(error)
	eval error $errorlist
    }
    return $state(status)
}

# http::formatQuery --
#
#	See documentaion for details.
#	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.
#
# Arguments:
#	args	A list of name-value pairs.
# Results:
#        TODO

proc http::formatQuery {args} {
    set result ""
    set sep ""
    foreach i $args {
	append result $sep [mapReply $i]
	if {[string compare $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 http::mapReply {string} {
    variable formMap
    set alphanumeric	a-zA-Z0-9
    regsub -all \[^$alphanumeric\] $string {$formMap(&)} string
    regsub -all \n $string {\\n} string
    regsub -all \t $string {\\t} string
    regsub -all {[][{})\\]\)} $string {\\&} string
    return [subst $string]
}

# Default proxy filter. 
 proc http::ProxyRequired {host} {
    variable 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 {}
    }
}