aboutsummaryrefslogtreecommitdiff
path: root/mod/mod-ci.cxx
blob: 42a38caf2b9fcffd390c198bed6c6e3f47dab3de (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
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
// file      : mod/mod-ci.cxx -*- C++ -*-
// license   : MIT; see accompanying LICENSE file

#include <mod/mod-ci.hxx>

#include <ostream>

#include <libbutl/uuid.hxx>
#include <libbutl/sendmail.mxx>
#include <libbutl/fdstream.mxx>
#include <libbutl/timestamp.mxx>
#include <libbutl/filesystem.mxx>
#include <libbutl/process-io.mxx>          // operator<<(ostream, process_args)
#include <libbutl/manifest-parser.mxx>
#include <libbutl/manifest-serializer.mxx>

#include <libbpkg/manifest.hxx>
#include <libbpkg/package-name.hxx>

#include <web/xhtml.hxx>
#include <web/module.hxx>

#include <mod/page.hxx>
#include <mod/options.hxx>
#include <mod/external-handler.hxx>

using namespace std;
using namespace butl;
using namespace web;
using namespace brep::cli;

brep::ci::
ci (const ci& r)
    : handler (r),
      options_ (r.initialized_ ? r.options_ : nullptr),
      form_ (r.initialized_ || r.form_ == nullptr
             ? r.form_
             : make_shared<xhtml::fragment> (*r.form_))
{
}

void brep::ci::
init (scanner& s)
{
  HANDLER_DIAG;

  options_ = make_shared<options::ci> (
    s, unknown_mode::fail, unknown_mode::fail);

  // Verify that the CI request handling is setup properly, if configured.
  //
  if (options_->ci_data_specified ())
  {
    // Verify the data directory satisfies the requirements.
    //
    const dir_path& d (options_->ci_data ());

    if (d.relative ())
      fail << "ci-data directory path must be absolute";

    if (!dir_exists (d))
      fail << "ci-data directory '" << d << "' does not exist";

    // Parse XHTML5 form file, if configured.
    //
    if (options_->ci_form_specified ())
    {
      const path& ci_form (options_->ci_form ());

      if (ci_form.relative ())
        fail << "ci-form path must be absolute";

      try
      {
        ifdstream is (ci_form);

        form_ = make_shared<xhtml::fragment> (is.read_text (),
                                              ci_form.string ());
      }
      catch (const xml::parsing& e)
      {
        fail << "unable to parse ci-form file: " << e;
      }
      catch (const io_error& e)
      {
        fail << "unable to read ci-form file '" << ci_form << "': " << e;
      }
    }

    if (options_->ci_handler_specified () &&
        options_->ci_handler ().relative ())
      fail << "ci-handler path must be absolute";
  }

  if (options_->root ().empty ())
    options_->root (dir_path ("/"));
}

bool brep::ci::
handle (request& rq, response& rs)
{
  using namespace bpkg;
  using namespace xhtml;

  using parser        = manifest_parser;
  using parsing       = manifest_parsing;
  using serializer    = manifest_serializer;
  using serialization = manifest_serialization;

  HANDLER_DIAG;

  const dir_path& root (options_->root ());

  // We will respond with the manifest to the CI request submission protocol
  // violations and with a plain text message on the internal errors. In the
  // latter case we will always respond with the same neutral message for
  // security reason, logging the error details. Note that descriptions of
  // exceptions caught by the web server are returned to the client (see
  // web/module.hxx for details), and we want to avoid this when there is a
  // danger of exposing sensitive data.
  //
  // Also we will pass through exceptions thrown by the underlying API, unless
  // we need to handle them or add details for the description, in which case
  // we will fallback to one of the above mentioned response methods.
  //
  // Note that both respond_manifest() and respond_error() are normally called
  // right before the end of the request handling. They both always return
  // true to allow bailing out with a single line, for example:
  //
  // return respond_error (); // Request is handled with an error.
  //
  string request_id; // Will be set later.
  auto respond_manifest = [&rs, &request_id] (status_code status,
                                              const string& message) -> bool
  {
    serializer s (rs.content (status, "text/manifest;charset=utf-8"),
                  "response");

    s.next ("", "1");                      // Start of manifest.
    s.next ("status", to_string (status));
    s.next ("message", message);

    if (!request_id.empty ())
      s.next ("reference", request_id);

    s.next ("", "");                       // End of manifest.
    return true;
  };

  auto respond_error = [&rs] (status_code status = 500) -> bool
  {
    rs.content (status, "text/plain;charset=utf-8")
      << "CI request submission handling failed" << endl;

    return true;
  };

  // Check if the CI request functionality is enabled.
  //
  // Note that this is not a submission protocol violation but it feels right
  // to respond with the manifest, to help the client a bit.
  //
  if (!options_->ci_data_specified ())
    return respond_manifest (404, "CI request submission disabled");

  // Parse the request form data and verify the submission size limit.
  //
  // Note that the submission may include the overrides upload that we don't
  // expect to be large.
  //
  const name_values& rps (rq.parameters (64 * 1024));

  // If there is no request parameters then we respond with the CI form XHTML,
  // if configured. Otherwise, will proceed as for the CI request and will fail
  // (missing parameters).
  //
  if (rps.empty () && form_ != nullptr)
  {
    const string title ("CI");

    xml::serializer s (rs.content (), title);

    s << HTML
      <<   HEAD
      <<     TITLE << title << ~TITLE
      <<     CSS_LINKS (path ("ci.css"), root)
      <<   ~HEAD
      <<   BODY
      <<     DIV_HEADER (options_->logo (), options_->menu (), root, tenant)
      <<     DIV(ID="content") << *form_ << ~DIV
      <<   ~BODY
      << ~HTML;

    return true;
  }

  // Verify the CI request parameters we expect. The unknown ones will be
  // serialized to the CI request manifest.
  //
  params::ci params;

  try
  {
    name_value_scanner s (rps);
    params = params::ci (s, unknown_mode::skip, unknown_mode::skip);
  }
  catch (const cli::exception&)
  {
    return respond_manifest (400, "invalid parameter");
  }

  const string& simulate (params.simulate ());

  if (simulate == "internal-error-text")
    return respond_error ();
  else if (simulate == "internal-error-html")
  {
    const string title ("Internal Error");
    xml::serializer s (rs.content (500), title);

    s << HTML
      <<   HEAD << TITLE << title << ~TITLE << ~HEAD
      <<   BODY << "CI request submission handling failed" << ~BODY
      << ~HTML;

    return true;
  }

  // Verify the remote repository location.
  //
  const repository_location rl (params.repository ());

  if (rl.empty () || rl.local ())
    return respond_manifest (400, "invalid repository location");

  // Verify the package name[/version] arguments.
  //
  for (const string& s: params.package())
  {
    //  Let's skip the potentially unfilled package form fields.
    //
    if (s.empty ())
      continue;

    try
    {
      size_t p (s.find ('/'));

      if (p != string::npos)
      {
        package_name (string (s, 0, p));

        // Not to confuse with module::version.
        //
        bpkg::version (string (s, p + 1));
      }
      else
        package_name p (s); // Not to confuse with the s variable declaration.
    }
    catch (const invalid_argument&)
    {
      return respond_manifest (400, "invalid package " + s);
    }
  }

  // Verify that unknown parameter values satisfy the requirements (contain
  // only UTF-8 encoded graphic characters plus '\t', '\r', and '\n').
  //
  // Actually, the expected ones must satisfy too, so check them as well.
  //
  for (const name_value& nv: rps)
  {
    if (nv.value && !utf8 (*nv.value, codepoint_types::graphic, U"\r\n\t"))
      return respond_manifest (400, "invalid parameter " + nv.name);
  }

  // Parse and validate overrides, if present.
  //
  vector<manifest_name_value> overrides;

  if (params.overrides_specified ())
  try
  {
    istream& is (rq.open_upload ("overrides"));
    parser mp (is, "overrides");
    overrides = parse_manifest (mp);

    package_manifest::validate_overrides (overrides, mp.name ());
  }
  // Note that invalid_argument (thrown by open_upload() function call) can
  // mean both no overrides upload or multiple overrides uploads.
  //
  catch (const invalid_argument&)
  {
    return respond_manifest (400, "overrides upload expected");
  }
  catch (const parsing& e)
  {
    return respond_manifest (400,
                             string ("unable to parse overrides: ") +
                             e.what ());
  }
  catch (const io_error& e)
  {
    error << "unable to read overrides: " << e;
    return respond_error ();
  }

  try
  {
    // Note that from now on the result manifest we respond with will contain
    // the reference value.
    //
    request_id = uuid::generate ().string ();
  }
  catch (const system_error& e)
  {
    error << "unable to generate request id: " << e;
    return respond_error ();
  }

  // Create the submission data directory.
  //
  dir_path dd (options_->ci_data () / dir_path (request_id));

  try
  {
    // It's highly unlikely but still possible that the directory already
    // exists. This can only happen if the generated uuid is not unique.
    //
    if (try_mkdir (dd) == mkdir_status::already_exists)
      throw_generic_error (EEXIST);
  }
  catch (const system_error& e)
  {
    error << "unable to create directory '" << dd << "': " << e;
    return respond_error ();
  }

  auto_rmdir ddr (dd);

  // Serialize the CI request manifest to a stream. On the serialization error
  // respond to the client with the manifest containing the bad request (400)
  // code and return false, on the stream error pass through the io_error
  // exception, otherwise return true.
  //
  timestamp ts (system_clock::now ());

  auto rqm = [&request_id,
              &rl,
              &ts,
              &simulate,
              &rq,
              &rps,
              &params,
              &respond_manifest]
             (ostream& os, bool long_lines = false) -> bool
  {
    try
    {
      serializer s (os, "request", long_lines);

      // Serialize the submission manifest header.
      //
      s.next ("", "1");                // Start of manifest.
      s.next ("id", request_id);
      s.next ("repository", rl.string ());

      for (const string& p: params.package ())
      {
        if (!p.empty ()) // Skip empty package names (see above for details).
          s.next ("package", p);
      }

      s.next ("timestamp",
              butl::to_string (ts,
                               "%Y-%m-%dT%H:%M:%SZ",
                               false /* special */,
                               false /* local */));

      if (!simulate.empty ())
        s.next ("simulate", simulate);

      // Serialize the User-Agent HTTP header and the client IP address.
      //
      optional<string> ip;
      optional<string> ua;
      for (const name_value& h: rq.headers ())
      {
        if (icasecmp (h.name, ":Client-IP") == 0)
          ip = h.value;
        else if (icasecmp (h.name, "User-Agent") == 0)
          ua = h.value;
      }

      if (ip)
        s.next ("client-ip", *ip);

      if (ua)
        s.next ("user-agent", *ua);

      // Serialize the request parameters.
      //
      // Note that the serializer constraints the parameter names (can't start
      // with '#', can't contain ':' and the whitespaces, etc.).
      //
      for (const name_value& nv: rps)
      {
        const string& n (nv.name);

        if (n != "repository" &&
            n != "_"          &&
            n != "package"    &&
            n != "overrides"  &&
            n != "simulate")
          s.next (n, nv.value ? *nv.value : "");
      }

      s.next ("", ""); // End of manifest.
      return true;
    }
    catch (const serialization& e)
    {
      respond_manifest (400, string ("invalid parameter: ") + e.what ());
      return false;
    }
  };

  // Serialize the CI request manifest to the submission directory.
  //
  path rqf (dd / "request.manifest");

  try
  {
    ofdstream os (rqf);
    bool r (rqm (os));
    os.close ();

    if (!r)
      return true; // The client is already responded with the manifest.
  }
  catch (const io_error& e)
  {
    error << "unable to write to '" << rqf << "': " << e;
    return respond_error ();
  }

  // Serialize the CI overrides manifest to a stream. On the stream error pass
  // through the io_error exception.
  //
  // Note that it can't throw the serialization exception as the override
  // manifest is parsed from the stream and so verified.
  //
  auto ovm = [&overrides] (ostream& os, bool long_lines = false)
  {
    try
    {
      serializer s (os, "overrides", long_lines);
      serialize_manifest (s, overrides);
    }
    catch (const serialization&) {assert (false);} // See above.
  };

  // Serialize the CI overrides manifest to the submission directory.
  //
  path ovf (dd / "overrides.manifest");

  if (!overrides.empty ())
  try
  {
    ofdstream os (ovf);
    ovm (os);
    os.close ();
  }
  catch (const io_error& e)
  {
    error << "unable to write to '" << ovf << "': " << e;
    return respond_error ();
  }

  // Given that the submission data is now successfully persisted we are no
  // longer in charge of removing it, except for the cases when the submission
  // handler terminates with an error (see below for details).
  //
  ddr.cancel ();

  // If the handler terminates with non-zero exit status or specifies 5XX
  // (HTTP server error) submission result manifest status value, then we
  // stash the submission data directory for troubleshooting. Otherwise, if
  // it's the 4XX (HTTP client error) status value, then we remove the
  // directory.
  //
  // Note that leaving the directory in place in case of a submission error
  // would have prevent the user from re-submitting until we research the
  // issue and manually remove the directory.
  //
  auto stash_submit_dir = [&dd, error] ()
  {
    if (dir_exists (dd))
    try
    {
      mvdir (dd, dir_path (dd + ".fail"));
    }
    catch (const system_error& e)
    {
      // Not much we can do here. Let's just log the issue and bail out
      // leaving the directory in place.
      //
      error << "unable to rename directory '" << dd << "': " << e;
    }
  };

  // Run the submission handler, if specified, reading the result manifest
  // from its stdout and caching it as a name/value pair list for later use
  // (forwarding to the client, sending via email, etc.). Otherwise, create
  // implied result manifest.
  //
  status_code sc;
  vector<manifest_name_value> rvs;

  if (options_->ci_handler_specified ())
  {
    using namespace external_handler;

    optional<result_manifest> r (run (options_->ci_handler (),
                                      options_->ci_handler_argument (),
                                      dd,
                                      options_->ci_handler_timeout (),
                                      error,
                                      warn,
                                      verb_ ? &trace : nullptr));
    if (!r)
    {
      stash_submit_dir ();
      return respond_error (); // The diagnostics is already issued.
    }

    sc = r->status;
    rvs = move (r->values);
  }
  else // Create the implied result manifest.
  {
    sc = 200;

    auto add = [&rvs] (string n, string v)
    {
      manifest_name_value nv {
        move (n), move (v),
        0 /* name_line */,  0 /* name_column */,
        0 /* value_line */, 0 /* value_column */,
        0 /* start_pos */, 0 /* colon_pos */, 0 /* end_pos */};

      rvs.emplace_back (move (nv));
    };

    add ("status", "200");
    add ("message", "CI request is queued");
    add ("reference", request_id);
  }

  assert (!rvs.empty ()); // Produced by the handler or is implied.

  // Serialize the submission result manifest to a stream. On the
  // serialization error log the error description and return false, on the
  // stream error pass through the io_error exception, otherwise return true.
  //
  auto rsm = [&rvs, &error, &request_id] (ostream& os,
                                          bool long_lines = false) -> bool
  {
    try
    {
      serializer s (os, "result", long_lines);
      serialize_manifest (s, rvs);
      return true;
    }
    catch (const serialization& e)
    {
      error << "ref " << request_id << ": unable to serialize handler's "
            << "output: " << e;
      return false;
    }
  };

  // If the submission data directory still exists then perform an appropriate
  // action on it, depending on the submission result status. Note that the
  // handler could move or remove the directory.
  //
  if (dir_exists (dd))
  {
    // Remove the directory if the client error is detected.
    //
    if (sc >= 400 && sc < 500)
      rmdir_r (dd);

    // Otherwise, save the result manifest, into the directory. Also stash the
    // directory for troubleshooting in case of the server error.
    //
    else
    {
      path rsf (dd / "result.manifest");

      try
      {
        ofdstream os (rsf);

        // Not being able to stash the result manifest is not a reason to
        // claim the submission failed. The error is logged nevertheless.
        //
        rsm (os);

        os.close ();
      }
      catch (const io_error& e)
      {
        // Not fatal (see above).
        //
        error << "unable to write to '" << rsf << "': " << e;
      }

      if (sc >= 500 && sc < 600)
        stash_submit_dir ();
    }
  }

  // Send email, if configured, and the CI request submission is not simulated.
  // Use the long lines manifest serialization mode for the convenience of
  // copying/clicking URLs they contain.
  //
  // Note that we don't consider the email sending failure to be a submission
  // failure as the submission data is successfully persisted and the handler
  // is successfully executed, if configured. One can argue that email can be
  // essential for the submission processing and missing it would result in
  // the incomplete submission. In this case it's natural to assume that the
  // web server error log is monitored and the email sending failure will be
  // noticed.
  //
  if (options_->ci_email_specified () && simulate.empty ())
  try
  {
    // Redirect the diagnostics to the web server error log.
    //
    sendmail sm ([&trace, this] (const char* args[], size_t n)
                 {
                   l2 ([&]{trace << process_args {args, n};});
                 },
                 2 /* stderr */,
                 options_->email (),
                 "CI request submission (" + request_id + ")",
                 {options_->ci_email ()});

    // Write the CI request manifest.
    //
    bool r (rqm (sm.out, true /* long_lines */));
    assert (r); // The serialization succeeded once, so can't fail now.

    // Write the CI overrides manifest.
    //
    sm.out << "\n\n";

    ovm (sm.out, true /* long_lines */);

    // Write the CI result manifest.
    //
    sm.out << "\n\n";

    // We don't care about the result (see above).
    //
    rsm (sm.out, true /* long_lines */);

    sm.out.close ();

    if (!sm.wait ())
      error << "sendmail " << *sm.exit;
  }
  // Handle process_error and io_error (both derive from system_error).
  //
  catch (const system_error& e)
  {
    error << "sendmail error: " << e;
  }

  if (!rsm (rs.content (sc, "text/manifest;charset=utf-8")))
    return respond_error (); // The error description is already logged.

  return true;
}