site - tilde.institute site files

about summary refs log tree commit diff stats

path: root/wiki/lib/plugins/authldap/lang/zh-tw

diff options

Diffstat (limited to 'wiki/lib/plugins/authldap/lang/zh-tw')

0 files changed, 0 insertions, 0 deletions

ef='#n52'>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

662@gmail.com>  2023-06-13 01:44:55 +0200
committer  bptato <nincsnevem662@gmail.com>  2023-06-13 01:44:55 +0200

Make Result.text, json return promise' href='/ahoang/chawan/commit/src/io/loader.nim?id=eff1e064fde12fd6976919ca76b56c124231b31a'>eff1e064 ^

f44339b4 ^

c1b83380 ^

4874b92f ^

1422f339 ^

eff1e064 ^

8048a943 ^

c1b83380 ^

c1b83380 ^

c1b83380 ^

8e6783a4 ^

d9e430c8 ^

e80ae4b1 ^

31fbd611 ^

010185f7 ^

d526deb9 ^

e38402df ^

010185f7 ^

78ffc938 ^

6b0b7ccf ^

36390a56 ^

896489a6 ^

a02c408f ^

896489a6 ^

8e6783a4 ^

a02c408f ^

eff1e064 ^

c15d0404 ^

a02c408f ^

1422f339 ^

897e403c ^

a02c408f ^

896489a6 ^

eff1e064 ^

897e403c ^

a8f218df ^

eff1e064 ^

896489a6 ^

d526deb9 ^

aa8f9676 ^

31fbd611 ^

b0583b47 ^

929b85d0 ^

b0583b47 ^

05b64a1d ^

aa8f9676 ^

05b64a1d ^

05b64a1d ^

aa8f9676 ^

c4f0423e ^

31fbd611 ^

ab203acf ^

8e6783a4 ^

b0583b47 ^

05b64a1d ^

e80ae4b1 ^

d0931964 ^

e80ae4b1 ^

b96d8cc5 ^

8048a943 ^

31fbd611 ^

136d8d9e ^

9b5df912 ^

8e6783a4 ^

e80ae4b1 ^

9026c578 ^

b3e08ac4 ^

4eb57c2b ^

31fbd611 ^

136d8d9e ^

136d8d9e ^

d0690cfe ^

8e6783a4 ^

aadbaffa ^

8e6783a4 ^

aadbaffa ^

8e6783a4 ^

b0583b47 ^

aadbaffa ^

4e690f15 ^

aadbaffa ^

973e8f94 ^

b0583b47 ^

973e8f94 ^

2d038b21 ^

245609d5 ^

973e8f94 ^

245609d5 ^

2d038b21 ^

973e8f94 ^

245609d5 ^

b0583b47 ^

929b85d0 ^

b0583b47 ^

245609d5 ^

b0583b47 ^

973e8f94 ^

96fd5ca8 ^

973e8f94 ^

b0583b47 ^

8e6783a4 ^

b0583b47 ^

d526deb9 ^

31fbd611 ^

4eb57c2b ^

8e6783a4 ^

31fbd611 ^

a6166c4d ^

136d8d9e ^

ab203acf ^

8e6783a4 ^

b0583b47 ^

973e8f94 ^

ab203acf ^

b0583b47 ^

245609d5 ^

b0583b47 ^

973e8f94 ^

8e6783a4 ^

31fbd611 ^

4eb57c2b ^

d91d1dda ^

31fbd611 ^

d0690cfe ^

31fbd611 ^

d0690cfe ^

31fbd611 ^

d0690cfe ^

e38402df ^

8e6783a4 ^

a2eadfb3 ^

8e6783a4 ^

aadbaffa ^

8e6783a4 ^

aadbaffa ^

8e6783a4 ^

973e8f94 ^

8e6783a4 ^

aadbaffa ^

973e8f94 ^

8e6783a4 ^

aadbaffa ^

8e6783a4 ^

aa8f9676 ^

05b64a1d ^

c4f0423e ^

8e6783a4 ^

c4f0423e ^

8e6783a4 ^

250cbcfa ^

05b64a1d ^

d0690cfe ^

8e6783a4 ^

05b64a1d ^

d91d1dda ^

05b64a1d ^

31fbd611 ^

05b64a1d ^

b96d8cc5 ^

d526deb9 ^

05b64a1d ^

05b64a1d ^

aa8f9676 ^

8e6783a4 ^

c4f0423e ^

8e6783a4 ^

c4f0423e ^

8e6783a4 ^

aa8f9676 ^

c4f0423e ^

aa8f9676 ^

c4f0423e ^

aa8f9676 ^

8e6783a4 ^

4e690f15 ^

c4f0423e ^

aa8f9676 ^

c4f0423e ^

aa8f9676 ^

c4f0423e ^

aa8f9676 ^

8e6783a4 ^

4e690f15 ^

c4f0423e ^

31fbd611 ^

b0583b47 ^

929b85d0 ^

1c0df44a ^

05b64a1d ^

05b64a1d ^

05b64a1d ^

8e6783a4 ^

897e403c ^

05b64a1d ^

05b64a1d ^

aa8f9676 ^

ab203acf ^

05b64a1d ^

d526deb9 ^

407b5253 ^

ab203acf ^

51ea622d ^

08a758ed ^

a6bbcd0d ^

4b666a22 ^

05b64a1d ^

136d8d9e ^

05b64a1d ^

27a47bc9 ^

aadbaffa ^

27a47bc9 ^

4e690f15 ^

27a47bc9 ^

27a47bc9 ^

245609d5 ^

27a47bc9 ^

05b64a1d ^

ab203acf ^

27a47bc9 ^

ab203acf ^

973e8f94 ^

407b5253 ^

27a47bc9 ^

ab203acf ^

c4f0423e ^

407b5253 ^

27a47bc9 ^

05b64a1d ^

a78c2619 ^

d526deb9 ^

c4f0423e ^

d526deb9 ^

c4f0423e ^

d526deb9 ^

c4f0423e ^

d526deb9 ^

a02c408f ^

d526deb9 ^

ac3e7378 ^

d526deb9 ^

a02c408f ^

ac3e7378 ^

d526deb9 ^

a02c408f ^

251b9469 ^

a02c408f ^

d91d1dda ^

a02c408f ^

d91d1dda ^

a02c408f ^

d91d1dda ^

a02c408f ^

d91d1dda ^

c5d77407 ^

a02c408f ^

b3e08ac4 ^

a02c408f ^

8e6783a4 ^

a02c408f ^

547a4926 ^

a02c408f ^

b3e08ac4 ^

87f9bd65 ^

34b90a0b ^

a02c408f ^

aa8f9676 ^

8e6783a4 ^

aa8f9676 ^

547a4926 ^

aa8f9676 ^

8e6783a4 ^

aa8f9676 ^

547a4926 ^

aa8f9676 ^

8e6783a4 ^

aa8f9676 ^

8e6783a4 ^

aa8f9676 ^

8e6783a4 ^

aa8f9676 ^

8e6783a4 ^

aa8f9676 ^

8e6783a4 ^

aa8f9676 ^

8e6783a4 ^

aa8f9676 ^

eff1e064 ^

d526deb9 ^

8e6783a4 ^

d526deb9 ^

d526deb9 ^

a02c408f ^

d526deb9 ^

8e6783a4 ^

34b90a0b ^

36390a56 ^

34b90a0b ^

c15d0404 ^

34b90a0b ^

36390a56 ^

eff1e064 ^

a8f218df ^

eff1e064 ^

547a4926 ^

9026c578 ^

a02c408f ^

dab0d1cd ^

e8fa2217 ^

b3e08ac4 ^

9026c578 ^

a02c408f ^

eff1e064 ^

98fd9596 ^

250cbcfa ^

eff1e064 ^

98fd9596 ^

547a4926 ^

eff1e064 ^

407b5253 ^

4e690f15 ^

250cbcfa ^

98fd9596 ^

eff1e064 ^

98fd9596 ^

d91d1dda ^

98fd9596 ^

547a4926 ^

98fd9596 ^

eff1e064 ^

a2eadfb3 ^

d526deb9 ^

15e6a231 ^

8e6783a4 ^

896489a6 ^

51ea622d ^

d526deb9 ^

8e6783a4 ^

dab0d1cd ^

aadbaffa ^

d526deb9 ^

a78c2619 ^

aa8f9676 ^

8e6783a4 ^

aa8f9676 ^

896489a6 ^

aa8f9676 ^

8e6783a4 ^

31fbd611 ^

b0583b47 ^

929b85d0 ^


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
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849









                                                                               






                                                              

                                                                               

                                                                      
 







                        
 
                      
                     
                 


                      
                   
               
                    
                 
                          
                     


                          
                      
                   
                    
                         
                
                      
                   
 
                       
 


               
    
                          
                 
                   
                                        
                                     
                           



                                 
                                        
                         
                    
 

                      
                       
                             
 
                      
        




           
                       
           
                     
 
                            
                 

                       
                        
                                       
                                       
                                  

                           

                                                                       

                                                   
 
                        
                            

                         



                                                                        
                        
                               
                       
                        
                   
 
                                             
 

                                                                       
 
                                                                     






                                                               



                                                                           







                                                                 

                                                                           
                                 
                                             
               

            










                                                                                
                      











                                                                
                                                                               
                            








                                                           

                                   

                                                           

                                              
                                           
                                           



































































                                                                                


                                                                           
                                                   
                                      


                                    



                                      
                                         
                                                               
                                              



                                                      
     
                                                               
 
                                                                               

                 
                        
                               

                                     
                                                                







                                                                   
                                       

                                                                        
                               


                                               
           

                                        
                                                  
                               


                                               

                      
         
                           
                                                              



                              
                                                           
                              
                                                 
                          
                                                
 
                                                                                
                                                                          

                                               
                            




                                                  
                    
            
                       


                                    


                                     
                                               

                           

                                                 
 
                                                       

                       


                               
                    
   
                                  

                            
                                              
                                             

                                      
       
                                                






                                                                            

                                                                          

                                      

                                                          
                                     

                                           






                                             
           




                                           
                       
                                    
                                  
                               
               
                  
                       
                       

                       
                                              
                                               


                                                                          
              
                  
                       
                       

                       
                                              
                                               


                                                                          











                                      





                                      






                                      

                                                         

                  
                                     
                   

                                  
            


                                                                       

                          
                   

                                

            

                                                                          
                                                                  

                                                
                                                                              






                                                              
                           
               
                     


                                      

            






                                                                            
                                                                      



                                              
                                   

































                                                                              


                                








                                                                 























                                                                              


                                                     
                                        

                                           




                                                    




                                                          
                               
                                                            

                                 



                                                                  
                               
                                          
                  
 









                                                          
                                             
           




                                            
           
              


                                                                             
                                              



                                                                           
                                                                   
                                                                 
       
                                                               
                                               
                                          
                                                                              
                                                          
                                                       

                                      
                                                              
                                                                 
                                             



                                                                           
                                                                     
                                                               



                                                                           
                                                               
                                                                          
                                                     


                      
                         
                        
                              




                                      
                
 

                                                                          
                                                            


                             
                         






                                      
                                                                 




                                                             
                         







                                        
                                                  

                                                                          
                                 


                    
                                                 

                                                                          
                                 


                    
                                                                 

                                                                          


                                                             

               

                       
                                                                            
                           







                                                                   
 






                                                
                                                      

                                                   
                                      

                                        

                                     
                                 
                              
                           

                                     
                                 
     
                             
                                                    
       



                                                                          

                               
                                                                            
                                                

                           


                                           
                                    
                                 
          
                                              
                                                                           
                                     

                  
                        
                                 





                                             

                                            


                                       
                                                  
                                   
                                                              





                                           
 
                                                                 
                                           
                                                                          
                                                       
                     

                        

                            
                                                   
       
                                          
                 
 



                                                  
                  

                                 

                                                  
                        
                  





                                                                             








                                                         






                                                         
# A file loader server (?)
# The idea here is that we receive requests with a socket, then respond to each
# with a response (ideally a document.)
# For now, the protocol looks like:
# C: Request
# S: res (0 => success, _ => error)
# if success:
#  S: status code
#  S: headers
#  if canredir:
#    C: redir?
#    if redir:
#      C: redirection file handle (through sendFileHandle)
#  S: response body (potentially into redirection file handle)
# else:
#  S: error message
#
# The body is passed to the stream as-is, so effectively nothing can follow it.
# canredir is a mechanism for piping files into pager-opened processes
# (i.e. mailcap).

import std/nativesockets
import std/net
import std/options
import std/posix
import std/selectors
import std/streams
import std/strutils
import std/tables

import extern/tempfile
import io/posixstream
import io/promise
import io/serialize
import io/serversocket
import io/socketstream
import io/urlfilter
import js/error
import js/javascript
import loader/cgi
import loader/connecterror
import loader/headers
import loader/loaderhandle
import loader/request
import loader/response
import loader/streamid
import types/cookie
import types/referer
import types/urimethodmap
import types/url
import utils/mimeguess
import utils/twtstr

import chagashi/charset

export request
export response

type
  FileLoader* = ref object
    process*: Pid
    clientPid*: int
    connecting*: Table[int, ConnectData]
    ongoing*: Table[int, OngoingData]
    unregistered*: seq[int]
    registerFun*: proc(fd: int)
    unregisterFun*: proc(fd: int)

  ConnectData = object
    promise: Promise[JSResult[Response]]
    stream*: SocketStream
    request: Request

  OngoingData = object
    buf: string
    response*: Response
    bodyRead: Promise[string]

  LoaderCommand = enum
    LOAD
    TEE
    SUSPEND
    RESUME
    ADDREF
    UNREF
    SET_REFERRER_POLICY
    PASS_FD
    REMOVE_CACHED_URL

  LoaderContext = ref object
    refcount: int
    ssock: ServerSocket
    alive: bool
    config: LoaderConfig
    handleMap: Table[int, LoaderHandle]
    outputMap: Table[int, OutputHandle]
    referrerpolicy: ReferrerPolicy
    selector: Selector[int]
    fd: int
    # List of cached files. Note that fds from passFd are never cached.
    cacheMap: Table[string, string] # URL -> path
    # List of file descriptors passed by the pager.
    passedFdMap: Table[string, FileHandle]

  LoaderConfig* = object
    defaultheaders*: Headers
    filter*: URLFilter
    cookiejar*: CookieJar
    proxy*: URL
    # When set to false, requests with a proxy URL are overridden by the
    # loader proxy.
    acceptProxy*: bool
    cgiDir*: seq[string]
    uriMethodMap*: URIMethodMap
    w3mCGICompat*: bool
    libexecPath*: string
    tmpdir*: string

  FetchPromise* = Promise[JSResult[Response]]

#TODO this may be too low if we want to use urimethodmap for everything
const MaxRewrites = 4

func canRewriteForCGICompat(ctx: LoaderContext, path: string): bool =
  if path.startsWith("/cgi-bin/") or path.startsWith("/$LIB/"):
    return true
  for dir in ctx.config.cgiDir:
    if path.startsWith(dir):
      return true
  return false

proc rejectHandle(handle: LoaderHandle, code: ConnectErrorCode, msg = "") =
  handle.sendResult(code, msg)
  handle.close()

func findOutput(ctx: LoaderContext, id: StreamId): OutputHandle =
  assert id.pid != -1 and id.fd != -1
  for it in ctx.outputMap.values:
    if it.clientId == id:
      return it
  return nil

#TODO linear search over strings :(
func findCachedHandle(ctx: LoaderContext, cacheUrl: string): LoaderHandle =
  assert cacheUrl != ""
  for it in ctx.handleMap.values:
    if it.cached and it.cacheUrl == cacheUrl:
      return it
  return nil

type PushBufferResult = enum
  pbrDone, pbrUnregister

# Either write data to the target output, or append it to the list of buffers to
# write and register the output in our selector.
proc pushBuffer(ctx: LoaderContext, output: OutputHandle, buffer: LoaderBuffer):
    PushBufferResult =
  if output.currentBuffer == nil:
    var n = 0
    try:
      n = output.ostream.sendData(buffer)
    except ErrorAgain:
      discard
    except ErrorBrokenPipe:
      return pbrUnregister
    if n < buffer.len:
      output.currentBuffer = buffer
      output.currentBufferIdx = n
      ctx.selector.registerHandle(output.ostream.fd, {Write}, 0)
      output.registered = true
  else:
    output.addBuffer(buffer)
  return pbrDone

proc addCacheFile(ctx: LoaderContext, handle: LoaderHandle, originalUrl: URL) =
  let output = handle.output
  let tmpf = getTempFile(ctx.config.tmpdir)
  let ps = newPosixStream(tmpf, O_CREAT or O_WRONLY, 0o600)
  if ps != nil:
    output.tee(ps, NullStreamId)
    let surl = $originalUrl
    ctx.cacheMap[surl] = tmpf
    handle.cacheUrl = surl

proc addFd(ctx: LoaderContext, handle: LoaderHandle) =
  let output = handle.output
  output.ostream.setBlocking(false)
  handle.istream.setBlocking(false)
  ctx.selector.registerHandle(handle.istream.fd, {Read}, 0)
  assert handle.istream.fd notin ctx.handleMap
  assert output.ostream.fd notin ctx.outputMap
  ctx.handleMap[handle.istream.fd] = handle
  ctx.outputMap[output.ostream.fd] = output

type HandleReadResult = enum
  hrrDone, hrrEmpty, hrrUnregister

# Called whenever there is more data available to read.
proc handleRead(ctx: LoaderContext, handle: LoaderHandle,
    unregWrite: var seq[OutputHandle]): HandleReadResult =
  while true:
    let buffer = newLoaderBuffer()
    try:
      let n = handle.istream.recvData(buffer)
      if n == 0:
        return hrrEmpty
      for output in handle.outputs:
        if ctx.pushBuffer(output, buffer) == pbrUnregister:
          unregWrite.add(output)
      if n < buffer.cap:
        break
    except ErrorAgain: # retry later
      break
    except ErrorBrokenPipe: # sender died; stop streaming
      return hrrUnregister
  hrrDone

# stream is a regular file, so we can't select on it.
# cachedHandle is used for attaching the output handle to a different
# LoaderHandle when loadFromCache is called while a download is still ongoing
# (and thus some parts of the document are not cached yet).
proc loadStreamRegular(ctx: LoaderContext, handle, cachedHandle: LoaderHandle) =
  var fail = false
  while true:
    var unregWrite: seq[OutputHandle] = @[]
    case ctx.handleRead(handle, unregWrite)
    of hrrDone: discard
    of hrrEmpty: break
    of hrrUnregister:
      fail = true
      break
    for output in unregWrite:
      output.parent = nil
      let i = handle.outputs.find(output)
      if output.registered:
        ctx.selector.unregister(output.ostream.fd)
        output.registered = false
      handle.outputs.del(i)
    if handle.outputs.len == 0:
      # original output died and so did the cache file. (or we didn't have a
      # cache file in the first place)
      break
  for output in handle.outputs:
    if unlikely(fail):
      output.ostream.close()
      output.ostream = nil
    elif cachedHandle != nil:
      output.parent = cachedHandle
      cachedHandle.outputs.add(output)
      ctx.outputMap[output.ostream.fd] = output
    elif output.registered:
      output.parent = nil
      output.istreamAtEnd = true
      ctx.outputMap[output.ostream.fd] = output
    else:
      assert output.ostream.fd notin ctx.outputMap
      output.ostream.close()
      output.ostream = nil
  handle.outputs.setLen(0)
  handle.istream.close()
  handle.istream = nil

proc loadStream(ctx: LoaderContext, handle: LoaderHandle, request: Request,
    originalUrl: URL) =
  ctx.passedFdMap.withValue(request.url.host, fdp):
    handle.canredir = request.canredir
    handle.sendResult(0)
    handle.sendStatus(200)
    handle.sendHeaders(newHeaders())
    let ps = newPosixStream(fdp[])
    var stats: Stat
    doAssert fstat(fdp[], stats) != -1
    handle.istream = ps
    ctx.passedFdMap.del(request.url.host)
    if S_ISREG(stats.st_mode): # probably stdin, like cha <file
      handle.output.ostream.setBlocking(false)
      if handle.cached:
        ctx.addCacheFile(handle, originalUrl)
      # not loading from cache, so cachedHandle is nil
      ctx.loadStreamRegular(handle, nil)
  do:
    handle.sendResult(ERROR_FILE_NOT_FOUND, "stream not found")

proc loadResource(ctx: LoaderContext, request: Request, handle: LoaderHandle) =
  var redo = true
  var tries = 0
  var prevurl: URL = nil
  let originalUrl = request.url
  while redo and tries < MaxRewrites:
    redo = false
    if ctx.config.w3mCGICompat and request.url.scheme == "file":
      let path = request.url.path.serialize_unicode()
      if ctx.canRewriteForCGICompat(path):
        let newURL = newURL("cgi-bin:" & path & request.url.search)
        if newURL.isSome:
          request.url = newURL.get
          inc tries
          redo = true
          continue
    if request.url.scheme == "cgi-bin":
      handle.loadCGI(request, ctx.config.cgiDir, ctx.config.libexecPath,
        prevurl)
      if handle.istream != nil:
        ctx.addFd(handle)
        if handle.cached:
          ctx.addCacheFile(handle, originalUrl)
      else:
        handle.close()
    elif request.url.scheme == "stream":
      ctx.loadStream(handle, request, originalUrl)
      if handle.istream != nil:
        ctx.addFd(handle)
        if handle.cached:
          ctx.addCacheFile(handle, originalUrl)
      else:
        handle.close()
    else:
      prevurl = request.url
      case ctx.config.uriMethodMap.findAndRewrite(request.url)
      of URI_RESULT_SUCCESS:
        inc tries
        redo = true
      of URI_RESULT_WRONG_URL:
        handle.rejectHandle(ERROR_INVALID_URI_METHOD_ENTRY)
      of URI_RESULT_NOT_FOUND:
        handle.rejectHandle(ERROR_UNKNOWN_SCHEME)
  if tries >= MaxRewrites:
    handle.rejectHandle(ERROR_TOO_MANY_REWRITES)

proc loadFromCache(ctx: LoaderContext, stream: SocketStream, request: Request) =
  let handle = newLoaderHandle(stream, request.canredir, request.clientId)
  let surl = $request.url
  let cachedHandle = ctx.findCachedHandle(surl)
  let output = handle.output
  ctx.cacheMap.withValue(surl, p):
    let ps = newPosixStream(p[], O_RDONLY, 0)
    if ps == nil:
      handle.rejectHandle(ERROR_FILE_NOT_IN_CACHE)
      ctx.cacheMap.del(surl)
      handle.close()
      return
    handle.istream = ps
    handle.sendResult(0)
    handle.sendStatus(200)
    handle.sendHeaders(newHeaders())
    if handle.cached:
      handle.cacheUrl = surl
    output.ostream.setBlocking(false)
    ctx.loadStreamRegular(handle, cachedHandle)
  do:
    if cachedHandle == nil:
      handle.rejectHandle(ERROR_URL_NOT_IN_CACHE)
      return

proc onLoad(ctx: LoaderContext, stream: SocketStream) =
  var request: Request
  stream.sread(request)
  let handle = newLoaderHandle(
    stream,
    request.canredir,
    request.clientId
  )
  assert request.clientId.pid != 0
  when defined(debug):
    handle.url = request.url
  if not ctx.config.filter.match(request.url):
    handle.rejectHandle(ERROR_DISALLOWED_URL)
  elif request.fromcache:
    ctx.loadFromCache(stream, request)
  else:
    for k, v in ctx.config.defaultheaders.table:
      if k notin request.headers.table:
        request.headers.table[k] = v
    if ctx.config.cookiejar != nil and ctx.config.cookiejar.cookies.len > 0:
      if "Cookie" notin request.headers.table:
        let cookie = ctx.config.cookiejar.serialize(request.url)
        if cookie != "":
          request.headers["Cookie"] = cookie
    if request.referer != nil and "Referer" notin request.headers:
      let r = getReferer(request.referer, request.url, ctx.referrerpolicy)
      if r != "":
        request.headers["Referer"] = r
    if request.proxy == nil or not ctx.config.acceptProxy:
      request.proxy = ctx.config.proxy
    ctx.loadResource(request, handle)

proc acceptConnection(ctx: LoaderContext) =
  let stream = ctx.ssock.acceptSocketStream()
  try:
    var cmd: LoaderCommand
    stream.sread(cmd)
    case cmd
    of LOAD:
      ctx.onLoad(stream)
    of TEE:
      var targetId: StreamId
      var clientId: StreamId
      stream.sread(targetId)
      stream.sread(clientId)
      let output = ctx.findOutput(targetId)
      if output != nil:
        output.tee(stream, clientId)
      stream.swrite(output != nil)
      stream.setBlocking(false)
    of SUSPEND:
      var pid: int
      var fds: seq[int]
      stream.sread(pid)
      stream.sread(fds)
      for fd in fds:
        let output = ctx.findOutput((pid, fd))
        if output != nil and output.registered:
          # remove from the selector, so any new reads will be just placed
          # in the handle's buffer
          ctx.selector.unregister(output.ostream.fd)
    of RESUME:
      var pid: int
      var fds: seq[int]
      stream.sread(pid)
      stream.sread(fds)
      for fd in fds:
        let output = ctx.findOutput((pid, fd))
        if output != nil and output.registered:
          # place the stream back into the selector, so we can write to it
          # again
          ctx.selector.registerHandle(output.ostream.fd, {Write}, 0)
    of ADDREF:
      inc ctx.refcount
    of UNREF:
      dec ctx.refcount
      if ctx.refcount == 0:
        ctx.alive = false
        stream.close()
      else:
        assert ctx.refcount > 0
    of SET_REFERRER_POLICY:
      stream.sread(ctx.referrerpolicy)
      stream.close()
    of PASS_FD:
      var id: string
      stream.sread(id)
      let fd = stream.recvFileHandle()
      ctx.passedFdMap[id] = fd
      stream.close()
    of REMOVE_CACHED_URL:
      var surl: string
      stream.sread(surl)
      ctx.cacheMap.withValue(surl, p):
        discard unlink(cstring(p[]))
        ctx.cacheMap.del(surl)
      stream.close()
  except ErrorBrokenPipe:
    # receiving end died while reading the file; give up.
    stream.close()

proc exitLoader(ctx: LoaderContext) =
  ctx.ssock.close()
  for path in ctx.cacheMap.values:
    discard unlink(cstring(path))
  exitnow(1)

var gctx: LoaderContext
proc initLoaderContext(fd: cint, config: LoaderConfig): LoaderContext =
  var ctx = LoaderContext(
    alive: true,
    config: config,
    refcount: 1,
    selector: newSelector[int]()
  )
  gctx = ctx
  #TODO ideally, buffered would be true. Unfortunately this conflicts with
  # sendFileHandle/recvFileHandle.
  ctx.ssock = initServerSocket(buffered = false, blocking = false)
  ctx.fd = int(ctx.ssock.sock.getFd())
  ctx.selector.registerHandle(ctx.fd, {Read}, 0)
  # The server has been initialized, so the main process can resume execution.
  var writef: File
  if not open(writef, FileHandle(fd), fmWrite):
    raise newException(Defect, "Failed to open input handle.")
  writef.write(char(0u8))
  writef.flushFile()
  close(writef)
  discard close(fd)
  onSignal SIGTERM, SIGINT:
    discard sig
    gctx.exitLoader()
  for dir in ctx.config.cgiDir.mitems:
    if dir.len > 0 and dir[^1] != '/':
      dir &= '/'
  return ctx

# This is only called when an OutputHandle could not read enough of one (or
# more) buffers, and we asked select to notify us when it will be available.
proc handleWrite(ctx: LoaderContext, output: OutputHandle,
    unregWrite: var seq[OutputHandle]) =
  while output.currentBuffer != nil:
    let buffer = output.currentBuffer
    try:
      let n = output.ostream.sendData(buffer, output.currentBufferIdx)
      output.currentBufferIdx += n
      if output.currentBufferIdx < buffer.len:
        break
      output.bufferCleared() # swap out buffer
    except ErrorAgain: # never mind
      break
    except ErrorBrokenPipe: # receiver died; stop streaming
      unregWrite.add(output)
      break
  if output.currentBuffer == nil:
    if output.istreamAtEnd:
      # after EOF, no need to send anything more here
      unregWrite.add(output)
    else:
      # all buffers sent, no need to select on this output again for now
      output.registered = false
      ctx.selector.unregister(output.ostream.fd)

proc finishCycle(ctx: LoaderContext, unregRead: var seq[LoaderHandle],
    unregWrite: var seq[OutputHandle]) =
  # Unregister handles queued for unregistration.
  # It is possible for both unregRead and unregWrite to contain duplicates. To
  # avoid double-close/double-unregister, we set the istream/ostream of
  # unregistered handles to nil.
  for handle in unregRead:
    if handle.istream != nil:
      ctx.selector.unregister(handle.istream.fd)
      ctx.handleMap.del(handle.istream.fd)
      handle.istream.close()
      handle.istream = nil
      for output in handle.outputs:
        output.istreamAtEnd = true
        if output.currentBuffer == nil:
          unregWrite.add(output)
  for output in unregWrite:
    if output.ostream != nil:
      if output.registered:
        ctx.selector.unregister(output.ostream.fd)
      ctx.outputMap.del(output.ostream.fd)
      output.ostream.close()
      output.ostream = nil
      let handle = output.parent
      if handle != nil: # may be nil if from loadStream S_ISREG
        let i = handle.outputs.find(output)
        handle.outputs.del(i)
        if handle.outputs.len == 0 and handle.istream != nil:
          # premature end of all output streams; kill istream too
          ctx.selector.unregister(handle.istream.fd)
          ctx.handleMap.del(handle.istream.fd)
          handle.istream.close()
          handle.istream = nil
    if output.sostream != nil:
      #TODO it is not clear what should happen when multiple outputs exist.
      #
      # Normally, sostream is created after redirection, and must be written
      # to & closed after the input has completely been written into the
      # output stream. e.g. runMailcapEntryFile uses this to wait for the file
      # to be completely downloaded before executing an entry that takes a
      # file parameter.
      #
      # We should either block clone in this case, or find a better way to
      # wait for file downloads to finish. (Note that the buffer remaining
      # opened until the file has been downloaded is a somewhat useful visual
      # indication; while it does not show progress (bad), it does at least
      # show that *something* has been opened. An alternative should probably
      # add a temporary entry to a file download screen or something.)
      try:
        output.sostream.swrite(true)
      except IOError:
        # ignore error, that just means the buffer has already closed the
        # stream
        discard
      output.sostream.close()
      output.sostream = nil

proc runFileLoader*(fd: cint, config: LoaderConfig) =
  var ctx = initLoaderContext(fd, config)
  while ctx.alive:
    let events = ctx.selector.select(-1)
    var unregRead: seq[LoaderHandle] = @[]
    var unregWrite: seq[OutputHandle] = @[]
    for event in events:
      if Read in event.events:
        if event.fd == ctx.fd: # incoming connection
          ctx.acceptConnection()
        else:
          let handle = ctx.handleMap[event.fd]
          case ctx.handleRead(handle, unregWrite)
          of hrrDone: discard
          of hrrEmpty: discard # handled as an error event
          of hrrUnregister: unregRead.add(handle)
      if Write in event.events:
        ctx.handleWrite(ctx.outputMap[event.fd], unregWrite)
      if Error in event.events:
        assert event.fd != ctx.fd
        ctx.outputMap.withValue(event.fd, outputp): # ostream died
          unregWrite.add(outputp[])
        do: # istream died
          let handle = ctx.handleMap[event.fd]
          unregRead.add(handle)
    ctx.finishCycle(unregRead, unregWrite)
  ctx.exitLoader()

proc getAttribute(contentType, attrname: string): string =
  let kvs = contentType.after(';')
  var i = kvs.find(attrname)
  var s = ""
  if i != -1 and kvs.len > i + attrname.len and
      kvs[i + attrname.len] == '=':
    i += attrname.len + 1
    while i < kvs.len and kvs[i] in AsciiWhitespace:
      inc i
    var q = false
    for j, c in kvs.toOpenArray(i, kvs.high):
      if q:
        s &= c
      elif c == '\\':
        q = true
      elif c == ';' or c in AsciiWhitespace:
        break
      else:
        s &= c
  return s

proc applyHeaders(loader: FileLoader, request: Request, response: Response) =
  if "Content-Type" in response.headers.table:
    #TODO this is inefficient and broken on several levels. (In particular,
    # it breaks mailcap named attributes other than charset.)
    # Ideally, contentType would be a separate object type.
    let header = response.headers.table["Content-Type"][0].toLowerAscii()
    response.contentType = header.until(';').strip().toLowerAscii()
    response.charset = getCharset(header.getAttribute("charset"))
  else:
    response.contentType = guessContentType($response.url.path,
      "application/octet-stream", DefaultGuess)
  if "Location" in response.headers.table:
    if response.status in 301u16..303u16 or response.status in 307u16..308u16:
      let location = response.headers.table["Location"][0]
      let url = parseURL(location, option(request.url))
      if url.isSome:
        if (response.status == 303 and
            request.httpMethod notin {HTTP_GET, HTTP_HEAD}) or
            (response.status == 301 or response.status == 302 and
            request.httpMethod == HTTP_POST):
          response.redirect = newRequest(url.get, HTTP_GET,
            mode = request.mode, credentialsMode = request.credentialsMode,
            destination = request.destination)
        else:
          response.redirect = newRequest(url.get, request.httpMethod,
            body = request.body, multipart = request.multipart,
            mode = request.mode, credentialsMode = request.credentialsMode,
            destination = request.destination)

#TODO: add init
proc fetch*(loader: FileLoader, input: Request): FetchPromise =
  let stream = connectSocketStream(loader.process, false, blocking = true)
  input.clientId = (loader.clientPid, int(stream.fd))
  stream.swrite(LOAD)
  stream.swrite(input)
  stream.flush()
  let fd = int(stream.fd)
  loader.registerFun(fd)
  let promise = FetchPromise()
  loader.connecting[fd] = ConnectData(
    promise: promise,
    request: input,
    stream: stream
  )
  return promise

proc reconnect*(loader: FileLoader, data: ConnectData) =
  let stream = connectSocketStream(loader.process, false, blocking = true)
  data.request.clientId = (loader.clientPid, int(stream.fd))
  stream.swrite(LOAD)
  stream.swrite(data.request)
  stream.flush()
  let fd = int(stream.fd)
  loader.registerFun(fd)
  loader.connecting[fd] = ConnectData(
    promise: data.promise,
    request: data.request,
    stream: stream
  )

proc switchStream*(data: var ConnectData, stream: SocketStream) =
  data.stream = stream

proc switchStream*(loader: FileLoader, data: var OngoingData,
    stream: SocketStream) =
  data.response.body = stream
  let fd = int(stream.fd)
  let realCloseImpl = stream.closeImpl
  stream.closeImpl = nil
  data.response.unregisterFun = proc() =
    loader.ongoing.del(fd)
    loader.unregistered.add(fd)
    loader.unregisterFun(fd)
    realCloseImpl(stream)

proc suspend*(loader: FileLoader, fds: seq[int]) =
  let stream = connectSocketStream(loader.process, false, blocking = true)
  stream.swrite(SUSPEND)
  stream.swrite(loader.clientPid)
  stream.swrite(fds)
  stream.close()

proc resume*(loader: FileLoader, fds: seq[int]) =
  let stream = connectSocketStream(loader.process, false, blocking = true)
  stream.swrite(RESUME)
  stream.swrite(loader.clientPid)
  stream.swrite(fds)
  stream.close()

proc tee*(loader: FileLoader, targetId: StreamId): SocketStream =
  let stream = connectSocketStream(loader.process, false, blocking = true)
  stream.swrite(TEE)
  stream.swrite(targetId)
  let clientId: StreamId = (loader.clientPid, int(stream.fd))
  stream.swrite(clientId)
  return stream

const BufferSize = 4096

proc handleHeaders(loader: FileLoader, request: Request, response: Response,
    stream: SocketStream) =
  var status: int
  stream.sread(status)
  response.status = cast[uint16](status)
  response.headers = newHeaders()
  stream.sread(response.headers)
  loader.applyHeaders(request, response)
  # Only a stream of the response body may arrive after this point.
  response.body = stream

proc onConnected*(loader: FileLoader, fd: int) =
  let connectData = loader.connecting[fd]
  let stream = connectData.stream
  let promise = connectData.promise
  let request = connectData.request
  var res: int
  stream.sread(res)
  let response = newResponse(res, request, fd, stream)
  if res == 0:
    loader.handleHeaders(request, response, stream)
    assert loader.unregisterFun != nil
    let realCloseImpl = stream.closeImpl
    stream.closeImpl = nil
    response.unregisterFun = proc() =
      loader.ongoing.del(fd)
      loader.unregistered.add(fd)
      loader.unregisterFun(fd)
      realCloseImpl(stream)
    loader.ongoing[fd] = OngoingData(
      response: response,
      bodyRead: response.bodyRead
    )
    stream.setBlocking(false)
    promise.resolve(JSResult[Response].ok(response))
  else:
    var msg: string
    # msg is discarded.
    #TODO maybe print if called from trusted code (i.e. global == client)?
    stream.sread(msg)
    loader.unregisterFun(fd)
    loader.unregistered.add(fd)
    let err = newTypeError("NetworkError when attempting to fetch resource")
    promise.resolve(JSResult[Response].err(err))
  loader.connecting.del(fd)

proc onRead*(loader: FileLoader, fd: int) =
  loader.ongoing.withValue(fd, buffer):
    let response = buffer[].response
    while not response.body.atEnd():
      let olen = buffer[].buf.len
      try:
        buffer[].buf.setLen(olen + BufferSize)
        let n = response.body.recvData(addr buffer[].buf[olen], BufferSize)
        buffer[].buf.setLen(olen + n)
        if n == 0:
          break
      except ErrorAgain:
        buffer[].buf.setLen(olen)
        break
    if response.body.atEnd():
      buffer[].bodyRead.resolve(buffer[].buf)
      buffer[].bodyRead = nil
      buffer[].buf = ""
      response.unregisterFun()

proc onError*(loader: FileLoader, fd: int) =
  loader.ongoing.withValue(fd, buffer):
    let response = buffer[].response
    when defined(debug):
      var lbuf {.noinit.}: array[BufferSize, char]
      if not response.body.atEnd():
        let n = response.body.recvData(addr lbuf[0], lbuf.len)
        assert n == 0
      assert response.body.atEnd()
    buffer[].bodyRead.resolve(buffer[].buf)
    buffer[].bodyRead = nil
    buffer[].buf = ""
    response.unregisterFun()

proc doRequest*(loader: FileLoader, request: Request): Response =
  let response = Response(url: request.url)
  let stream = connectSocketStream(loader.process, false, blocking = true)
  request.clientId = (loader.clientPid, int(stream.fd))
  stream.swrite(LOAD)
  stream.swrite(request)
  stream.flush()
  stream.sread(response.res)
  if response.res == 0:
    loader.handleHeaders(request, response, stream)
  else:
    stream.sread(response.internalMessage)
  return response

proc addref*(loader: FileLoader) =
  let stream = connectSocketStream(loader.process)
  if stream != nil:
    stream.swrite(ADDREF)
    stream.close()

proc unref*(loader: FileLoader) =
  let stream = connectSocketStream(loader.process)
  if stream != nil:
    stream.swrite(UNREF)
    stream.close()

proc setReferrerPolicy*(loader: FileLoader, referrerpolicy: ReferrerPolicy) =
  let stream = connectSocketStream(loader.process)
  if stream != nil:
    stream.swrite(SET_REFERRER_POLICY)
    stream.swrite(referrerpolicy)
    stream.close()

proc passFd*(pid: Pid, id: string, fd: FileHandle) =
  let stream = connectSocketStream(pid, buffered = false)
  if stream != nil:
    stream.swrite(PASS_FD)
    stream.swrite(id)
    stream.sendFileHandle(fd)
    stream.close()

proc removeCachedURL*(loader: FileLoader, surl: string) =
  let stream = connectSocketStream(loader.process)
  if stream != nil:
    stream.swrite(REMOVE_CACHED_URL)
    stream.swrite(surl)
    stream.close()


context:
space:
mode: