apps/api/handlers/library_handlers.py

   1 # -*- encoding: utf-8 -*-
   2 import os.path
   3
   4 import logging
   5 log = logging.getLogger('platforma.api.library')
   6
   7 __author__= "Łukasz Rekucki"
   8 __date__ = "$2009-09-25 15:49:50$"
   9 __doc__ = "Module documentation."
  10
  11 from piston.handler import BaseHandler, AnonymousBaseHandler
  12
  13 import re
  14 from datetime import date
  15
  16 from django.core.urlresolvers import reverse
  17 from django.utils import simplejson as json
  18 from django.db import IntegrityError
  19
  20 import librarian
  21 import librarian.html
  22 from librarian import dcparser, parser
  23
  24 from wlrepo import *
  25 from api.models import PullRequest
  26 from explorer.models import GalleryForDocument
  27
  28 # internal imports
  29 import api.forms as forms
  30 import api.response as response
  31 from api.utils import validate_form, hglibrary, natural_order
  32 from api.models import PartCache
  33
  34 #
  35 import settings
  36
  37
  38 def is_prq(username):
  39     return username.startswith('$prq-')
  40
  41 def check_user(request, user):
  42     log.info("user: %r, perm: %r" % (request.user, request.user.get_all_permissions()) )
  43     #pull request
  44     if is_prq(user):
  45         if not request.user.has_perm('api.pullrequest.can_view'):
  46             yield response.AccessDenied().django_response({
  47                 'reason': 'access-denied',
  48                 'message': "You don't have enough priviliges to view pull requests."
  49             })
  50     # other users
  51     elif request.user.username != user:
  52         if not request.user.has_perm('api.document.can_view_other'):
  53             yield response.AccessDenied().django_response({
  54                 'reason': 'access-denied',
  55                 'message': "You don't have enough priviliges to view other people's document."
  56             })
  57     pass
  58
  59 #
  60 # Document List Handlers
  61 #
  62 # TODO: security check
  63 class BasicLibraryHandler(AnonymousBaseHandler):
  64     allowed_methods = ('GET',)
  65
  66     @hglibrary
  67     def read(self, request, lib):
  68         """Return the list of documents."""
  69         document_list = [{
  70             'url': reverse('document_view', args=[docid]),
  71             'name': docid } for docid in lib.documents() ]
  72         return {'documents' : document_list}
  73
  74 #
  75 # This handler controlls the document collection
  76 #
  77 class LibraryHandler(BaseHandler):
  78     allowed_methods = ('GET', 'POST')
  79     anonymous = BasicLibraryHandler
  80
  81     @hglibrary
  82     def read(self, request, lib):
  83         """Return the list of documents."""
  84
  85         documents = {}
  86
  87         for docid in lib.documents():
  88             documents[docid] = {
  89                 'url': reverse('document_view', args=[docid]),
  90                 'name': docid,
  91                 'parts': []
  92             }
  93
  94         parts = PartCache.objects.defer('part_id')\
  95             .values_list('part_id', 'document_id').distinct()
  96
  97         document_tree = dict(documents)
  98
  99         for part, docid in parts:
 100             # this way, we won't display broken links
 101             if not documents.has_key(part):
 102                 log.info("NOT FOUND: %s", part)
 103                 continue
 104
 105             parent = documents[docid]
 106             child = documents[part]
 107
 108             # not top-level anymore
 109             document_tree.pop(part)
 110             parent['parts'].append(child)
 111
 112         for doc in documents.itervalues():
 113             doc['parts'].sort(key=natural_order(lambda d: d['name']))
 114
 115         return {'documents': sorted(document_tree.itervalues(),
 116             key=natural_order(lambda d: d['name']) ) }
 117
 118
 119     @validate_form(forms.DocumentUploadForm, 'POST')
 120     @hglibrary
 121     def create(self, request, form, lib):
 122         """Create a new document."""
 123
 124         if form.cleaned_data['ocr_data']:
 125             data = form.cleaned_data['ocr_data']
 126         else:
 127             data = request.FILES['ocr_file'].read().decode('utf-8')
 128
 129         if data is None:
 130             return response.BadRequest().django_response('You must pass ocr_data or ocr_file.')
 131
 132         if form.cleaned_data['generate_dc']:
 133             data = librarian.wrap_text(data, unicode(date.today()))
 134
 135         docid = form.cleaned_data['bookname']
 136
 137         try:
 138             lock = lib.lock()
 139             try:
 140                 log.info("DOCID %s", docid)
 141                 doc = lib.document_create(docid)
 142                 # document created, but no content yet
 143
 144                 try:
 145                     doc = doc.quickwrite('xml', data.encode('utf-8'),
 146                         '$AUTO$ XML data uploaded.', user=request.user.username)
 147                 except Exception,e:
 148                     import traceback
 149                     # rollback branch creation
 150                     lib._rollback()
 151                     raise LibraryException(traceback.format_exc())
 152
 153                 url = reverse('document_view', args=[doc.id])
 154
 155                 return response.EntityCreated().django_response(\
 156                     body = {
 157                         'url': url,
 158                         'name': doc.id,
 159                         'revision': doc.revision },
 160                     url = url )
 161             finally:
 162                 lock.release()
 163         except LibraryException, e:
 164             import traceback
 165             return response.InternalError().django_response({
 166                 "reason": traceback.format_exc()
 167             })
 168         except DocumentAlreadyExists:
 169             # Document is already there
 170             return response.EntityConflict().django_response({
 171                 "reason": "already-exists",
 172                 "message": "Document already exists." % docid
 173             })
 174
 175 #
 176 # Document Handlers
 177 #
 178 class BasicDocumentHandler(AnonymousBaseHandler):
 179     allowed_methods = ('GET',)
 180
 181     @hglibrary
 182     def read(self, request, docid, lib):
 183         try:
 184             doc = lib.document(docid)
 185         except RevisionNotFound:
 186             return rc.NOT_FOUND
 187
 188         result = {
 189             'name': doc.id,
 190             'html_url': reverse('dochtml_view', args=[doc.id]),
 191             'text_url': reverse('doctext_view', args=[doc.id]),
 192             'dc_url': reverse('docdc_view', args=[doc.id]),
 193             'public_revision': doc.revision,
 194         }
 195
 196         return result
 197
 198 #
 199 # Document Meta Data
 200 #
 201 class DocumentHandler(BaseHandler):
 202     allowed_methods = ('GET', 'PUT')
 203     anonymous = BasicDocumentHandler
 204
 205     @validate_form(forms.DocumentRetrieveForm, 'GET')
 206     @hglibrary
 207     def read(self, request, form, docid, lib):
 208         """Read document's meta data"""
 209         log.info(u"User '%s' wants to %s(%s) as %s" % \
 210             (request.user.username, docid, form.cleaned_data['revision'], form.cleaned_data['user']) )
 211
 212         user = form.cleaned_data['user'] or request.user.username
 213         rev = form.cleaned_data['revision'] or 'latest'
 214
 215         for error in check_user(request, user):
 216             return error
 217
 218         try:
 219             doc = lib.document(docid, user, rev=rev)
 220         except RevisionMismatch, e:
 221             # the document exists, but the revision is bad
 222             return response.EntityNotFound().django_response({
 223                 'reason': 'revision-mismatch',
 224                 'message': e.message,
 225                 'docid': docid,
 226                 'user': user,
 227             })
 228         except RevisionNotFound, e:
 229             # the user doesn't have this document checked out
 230             # or some other weird error occured
 231             # try to do the checkout
 232             if is_prq(user) or (user == request.user.username):
 233                 try:
 234                     mdoc = lib.document(docid)
 235                     doc = mdoc.take(user)
 236
 237                     if is_prq(user):
 238                         # source revision, should probably change
 239                         # but there are no changes yet, so...
 240                         pass
 241
 242                 except RevisionNotFound, e:
 243                     return response.EntityNotFound().django_response({
 244                         'reason': 'document-not-found',
 245                         'message': e.message,
 246                         'docid': docid
 247                     })
 248             else:
 249                 return response.EntityNotFound().django_response({
 250                     'reason': 'document-not-found',
 251                     'message': e.message,
 252                     'docid': docid,
 253                     'user': user,
 254                 })
 255
 256         return {
 257             'name': doc.id,
 258             'user': user,
 259             'html_url': reverse('dochtml_view', args=[doc.id]),
 260             'text_url': reverse('doctext_view', args=[doc.id]),
 261             # 'dc_url': reverse('docdc_view', args=[doc.id]),
 262             'gallery_url': reverse('docgallery_view', args=[doc.id]),
 263             'merge_url': reverse('docmerge_view', args=[doc.id]),
 264             'user_revision': doc.revision,
 265             'user_timestamp': doc.revision.timestamp,
 266             # 'public_revision': doc.revision,
 267             # 'public_timestamp': doc.revision.timestamp,
 268         }
 269
 270
 271 #    @hglibrary
 272 #    def update(self, request, docid, lib):
 273 #        """Update information about the document, like display not"""
 274 #        return
 275 #
 276 #
 277 #
 278 class DocumentHTMLHandler(BaseHandler):
 279     allowed_methods = ('GET')
 280
 281     @validate_form(forms.DocumentRetrieveForm, 'GET')
 282     @hglibrary
 283     def read(self, request, form, docid, lib, stylesheet='partial'):
 284         """Read document as html text"""
 285         try:
 286             revision = form.cleaned_data['revision']
 287             user = form.cleaned_data['user'] or request.user.username
 288             document = lib.document_for_rev(revision)
 289
 290             if document.id != docid:
 291                 return response.BadRequest().django_response({
 292                     'reason': 'name-mismatch',
 293                     'message': 'Provided revision is not valid for this document'
 294                 })
 295
 296             if document.owner != user:
 297                 return response.BadRequest().django_response({
 298                     'reason': 'user-mismatch',
 299                     'message': "Provided revision doesn't belong to user %s" % user
 300                 })
 301
 302             for error in check_user(request, user):
 303                 return error
 304
 305             return librarian.html.transform(document.data('xml'), is_file=False, \
 306                 parse_dublincore=False, stylesheet=stylesheet,\
 307                 options={
 308                     "with-paths": 'boolean(1)',
 309                 })
 310
 311         except (EntryNotFound, RevisionNotFound), e:
 312             return response.EntityNotFound().django_response({
 313                 'reason': 'not-found', 'message': e.message})
 314         except librarian.ParseError, e:
 315             return response.InternalError().django_response({
 316                 'reason': 'xml-parse-error', 'message': e.message })
 317
 318 #
 319 # Image Gallery
 320 #
 321
 322 class DocumentGalleryHandler(BaseHandler):
 323     allowed_methods = ('GET')
 324
 325
 326     def read(self, request, docid):
 327         """Read meta-data about scans for gallery of this document."""
 328         galleries = []
 329         from urllib import quote
 330
 331         for assoc in GalleryForDocument.objects.filter(document=docid):
 332             dirpath = os.path.join(settings.MEDIA_ROOT, assoc.subpath)
 333
 334             if not os.path.isdir(dirpath):
 335                 log.warn(u"[WARNING]: missing gallery %s", dirpath)
 336                 continue
 337
 338             gallery = {'name': assoc.name, 'pages': []}
 339
 340             for file in sorted(os.listdir(dirpath)):
 341                 if not isinstance(file, unicode):
 342                     try:
 343                         file = file.decode('utf-8')
 344                     except:
 345                         log.warn(u"File %r in gallery %r is not unicode. Ommiting."\
 346                             % (file, dirpath) )
 347                         file = None
 348
 349                 if file is not None:
 350                     name, ext = os.path.splitext(os.path.basename(file))
 351
 352                     if ext.lower() not in [u'.png', u'.jpeg', u'.jpg']:
 353                         log.warn(u"Ignoring: %s %s", name, ext)
 354                         url = None
 355
 356                     url = settings.MEDIA_URL + assoc.subpath + u'/' + file
 357
 358                 if url is None:
 359                     url = settings.MEDIA_URL + u'/missing.png'
 360
 361                 gallery['pages'].append( quote(url.encode('utf-8')) )
 362
 363 #            gallery['pages'].sort()
 364             galleries.append(gallery)
 365
 366         return galleries
 367
 368 #
 369 # Document Text View
 370 #
 371
 372 XINCLUDE_REGEXP = r"""<(?:\w+:)?include\s+[^>]*?href=("|')wlrepo://(?P<link>[^\1]+?)\1\s*[^>]*?>"""
 373 #
 374 #
 375 #
 376
 377 class DocumentTextHandler(BaseHandler):
 378     allowed_methods = ('GET', 'POST')
 379
 380     @validate_form(forms.TextRetrieveForm, 'GET')
 381     @hglibrary
 382     def read(self, request, form, docid, lib):
 383         """Read document as raw text"""
 384         try:
 385             revision = form.cleaned_data['revision']
 386             part = form.cleaned_data['part']
 387             user = form.cleaned_data['user'] or request.user.username
 388
 389             document = lib.document_for_rev(revision)
 390
 391             if document.id != docid:
 392                 return response.BadRequest().django_response({
 393                     'reason': 'name-mismatch',
 394                     'message': 'Provided revision is not valid for this document'
 395                 })
 396
 397             if document.owner != user:
 398                 return response.BadRequest().django_response({
 399                     'reason': 'user-mismatch',
 400                     'message': "Provided revision doesn't belong to user %s" % user
 401                 })
 402
 403             for error in check_user(request, user):
 404                 return error
 405
 406             if not part:
 407                 return document.data('xml')
 408
 409             xdoc = parser.WLDocument.from_string(document.data('xml'),\
 410                 parse_dublincore=False)
 411             ptext = xdoc.part_as_text(part)
 412
 413             if ptext is None:
 414                 return response.EntityNotFound().django_response({
 415                       'reason': 'no-part-in-document'
 416                 })
 417
 418             return ptext
 419         except librarian.ParseError, e:
 420             return response.EntityNotFound().django_response({
 421                 'reason': 'invalid-document-state',
 422                 'exception': type(e),
 423                 'message': e.message
 424             })
 425         except (EntryNotFound, RevisionNotFound), e:
 426             return response.EntityNotFound().django_response({
 427                 'reason': 'not-found',
 428                 'exception': type(e), 'message': e.message
 429             })
 430
 431     @validate_form(forms.TextUpdateForm, 'POST')
 432     @hglibrary
 433     def create(self, request, form, docid, lib):
 434         try:
 435             revision = form.cleaned_data['revision']
 436             msg = form.cleaned_data['message']
 437             user = form.cleaned_data['user'] or request.user.username
 438
 439             # do not allow changing not owned documents
 440             # (for now... )
 441
 442
 443             if user != request.user.username:
 444                 return response.AccessDenied().django_response({
 445                     'reason': 'insufficient-priviliges',
 446                 })
 447
 448             current = lib.document(docid, user)
 449             orig = lib.document_for_rev(revision)
 450
 451             if current != orig:
 452                 return response.EntityConflict().django_response({
 453                         "reason": "out-of-date",
 454                         "provided_revision": orig.revision,
 455                         "latest_revision": current.revision })
 456
 457             if form.cleaned_data.has_key('contents'):
 458                 data = form.cleaned_data['contents']
 459             else:
 460                 chunks = form.cleaned_data['chunks']
 461                 xdoc = parser.WLDocument.from_string(current.data('xml'))
 462                 errors = xdoc.merge_chunks(chunks)
 463
 464                 if len(errors):
 465                     return response.EntityConflict().django_response({
 466                             "reason": "invalid-chunks",
 467                             "message": "Unable to merge following parts into the document: %s " % ",".join(errors)
 468                     })
 469
 470                 data = xdoc.serialize()
 471
 472             # try to find any Xinclude tags
 473             includes = [m.groupdict()['link'] for m in (re.finditer(\
 474                 XINCLUDE_REGEXP, data, flags=re.UNICODE) or []) ]
 475
 476             log.info("INCLUDES: %s", includes)
 477
 478             # TODO: provide useful routines to make this simpler
 479             def xml_update_action(lib, resolve):
 480                 try:
 481                     f = lib._fileopen(resolve('parts'), 'r')
 482                     stored_includes = json.loads(f.read())
 483                     f.close()
 484                 except:
 485                     stored_includes = []
 486
 487                 if stored_includes != includes:
 488                     f = lib._fileopen(resolve('parts'), 'w+')
 489                     f.write(json.dumps(includes))
 490                     f.close()
 491
 492                     lib._fileadd(resolve('parts'))
 493
 494                     # update the parts cache
 495                     PartCache.update_cache(docid, current.owner,\
 496                         stored_includes, includes)
 497
 498                 # now that the parts are ok, write xml
 499                 f = lib._fileopen(resolve('xml'), 'w+')
 500                 f.write(data.encode('utf-8'))
 501                 f.close()
 502
 503             ndoc = None
 504             ndoc = current.invoke_and_commit(\
 505                 xml_update_action, lambda d: (msg, user) )
 506
 507             try:
 508                 # return the new revision number
 509                 return response.SuccessAllOk().django_response({
 510                     "document": ndoc.id,
 511                     "user": user,
 512                     "subview": "xml",
 513                     "previous_revision": current.revision,
 514                     "revision": ndoc.revision,
 515                     'timestamp': ndoc.revision.timestamp,
 516                     "url": reverse("doctext_view", args=[ndoc.id])
 517                 })
 518             except Exception, e:
 519                 if ndoc: lib._rollback()
 520                 raise e
 521         except RevisionNotFound, e:
 522             return response.EntityNotFound(mimetype="text/plain").\
 523                 django_response(e.message)
 524
 525
 526 #
 527 # Dublin Core handlers
 528 #
 529 # @requires librarian
 530 #
 531 #class DocumentDublinCoreHandler(BaseHandler):
 532 #    allowed_methods = ('GET', 'POST')
 533 #
 534 #    @hglibrary
 535 #    def read(self, request, docid, lib):
 536 #        """Read document as raw text"""
 537 #        try:
 538 #            revision = request.GET.get('revision', 'latest')
 539 #
 540 #            if revision == 'latest':
 541 #                doc = lib.document(docid)
 542 #            else:
 543 #                doc = lib.document_for_rev(revision)
 544 #
 545 #
 546 #            if document.id != docid:
 547 #                return response.BadRequest().django_response({'reason': 'name-mismatch',
 548 #                    'message': 'Provided revision is not valid for this document'})
 549 #
 550 #            bookinfo = dcparser.BookInfo.from_string(doc.data('xml'))
 551 #            return bookinfo.serialize()
 552 #        except (EntryNotFound, RevisionNotFound), e:
 553 #            return response.EntityNotFound().django_response({
 554 #                'exception': type(e), 'message': e.message})
 555 #
 556 #    @hglibrary
 557 #    def create(self, request, docid, lib):
 558 #        try:
 559 #            bi_json = request.POST['contents']
 560 #            revision = request.POST['revision']
 561 #
 562 #            if request.POST.has_key('message'):
 563 #                msg = u"$USER$ " + request.PUT['message']
 564 #            else:
 565 #                msg = u"$AUTO$ Dublin core update."
 566 #
 567 #            current = lib.document(docid, request.user.username)
 568 #            orig = lib.document_for_rev(revision)
 569 #
 570 #            if current != orig:
 571 #                return response.EntityConflict().django_response({
 572 #                        "reason": "out-of-date",
 573 #                        "provided": orig.revision,
 574 #                        "latest": current.revision })
 575 #
 576 #            xmldoc = parser.WLDocument.from_string(current.data('xml'))
 577 #            document.book_info = dcparser.BookInfo.from_json(bi_json)
 578 #
 579 #            # zapisz
 580 #            ndoc = current.quickwrite('xml', \
 581 #                document.serialize().encode('utf-8'),\
 582 #                message=msg, user=request.user.username)
 583 #
 584 #            try:
 585 #                # return the new revision number
 586 #                return {
 587 #                    "document": ndoc.id,
 588 #                    "subview": "dc",
 589 #                    "previous_revision": current.revision,
 590 #                    "revision": ndoc.revision,
 591 #                    'timestamp': ndoc.revision.timestamp,
 592 #                    "url": reverse("docdc_view", args=[ndoc.id])
 593 #                }
 594 #            except Exception, e:
 595 #                if ndoc: lib._rollback()
 596 #                raise e
 597 #        except RevisionNotFound:
 598 #            return response.EntityNotFound().django_response()
 599
 600 class MergeHandler(BaseHandler):
 601     allowed_methods = ('POST',)
 602
 603     @validate_form(forms.MergeRequestForm, 'POST')
 604     @hglibrary
 605     def create(self, request, form, docid, lib):
 606         """Create a new document revision from the information provided by user"""
 607         revision = form.cleaned_data['revision']
 608
 609         # fetch the main branch document
 610         doc = lib.document(docid)
 611
 612         # fetch the base document
 613         user_doc = lib.document_for_rev(revision)
 614         base_doc = user_doc.latest()
 615
 616         if base_doc != user_doc:
 617             return response.EntityConflict().django_response({
 618                 "reason": "out-of-date",
 619                 "provided": str(user_doc.revision),
 620                 "latest": str(base_doc.revision)
 621             })
 622
 623         if form.cleaned_data['type'] == 'update':
 624             # update is always performed from the file branch
 625             # to the user branch
 626             changed, clean = base_doc.update(request.user.username)
 627
 628             # update user document
 629             if changed:
 630                 user_doc_new = user_doc.latest()
 631
 632             # shared document is the same
 633             doc_new = doc
 634
 635         if form.cleaned_data['type'] == 'share':
 636             if not base_doc.up_to_date():
 637                 return response.BadRequest().django_response({
 638                     "reason": "not-fast-forward",
 639                     "message": "You must first update yout branch to the latest version."
 640                 })
 641
 642             # check for unresolved conflicts
 643             if base_doc.has_conflict_marks():
 644                 return response.BadRequest().django_response({
 645                     "reason": "unresolved-conflicts",
 646                     "message": "There are unresolved conflicts in your file. Fix them, and try again."
 647                 })
 648
 649             if not request.user.has_perm('api.document.can_share'):
 650                 # User is not permitted to make a merge, right away
 651                 # So we instead create a pull request in the database
 652                 try:
 653                     prq, created = PullRequest.objects.get_or_create(
 654                         comitter = request.user,
 655                         document = docid,
 656                         status = "N",
 657                         defaults = {
 658                             'source_revision': str(base_doc.revision),
 659                             'comment': form.cleaned_data['message'] or '$AUTO$ Document shared.',
 660                         }
 661                     )
 662
 663                     # there can't be 2 pending request from same user
 664                     # for the same document
 665                     if not created:
 666                         prq.source_revision = str(base_doc.revision)
 667                         prq.comment = prq.comment + 'u\n\n' + (form.cleaned_data['message'] or u'')
 668                         prq.save()
 669
 670                     return response.RequestAccepted().django_response(\
 671                         ticket_status=prq.status, \
 672                         ticket_uri=reverse("pullrequest_view", args=[prq.id]) )
 673                 except IntegrityError:
 674                     return response.EntityConflict().django_response({
 675                         'reason': 'request-already-exist'
 676                     })
 677
 678             changed = base_doc.share(form.cleaned_data['message'])
 679
 680             # update shared version if needed
 681             if changed:
 682                 doc_new = doc.latest()
 683
 684             # the user wersion is the same
 685             user_doc_new = base_doc
 686
 687         # The client can compare parent_revision to revision
 688         # to see if he needs to update user's view
 689         # Same goes for shared view
 690
 691         return response.SuccessAllOk().django_response({
 692             "name": user_doc_new.id,
 693             "user": user_doc_new.owner,
 694             "parent_revision": user_doc_new.revision,
 695             "parent_shared_revision": doc.revision,
 696             "revision": user_doc_new.revision,
 697             "shared_revision": doc_new.revision,
 698             'timestamp': user_doc_new.revision.timestamp,
 699         })